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WO2021244501A1 - 通信方法及装置 - Google Patents

通信方法及装置 Download PDF

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Publication number
WO2021244501A1
WO2021244501A1 PCT/CN2021/097557 CN2021097557W WO2021244501A1 WO 2021244501 A1 WO2021244501 A1 WO 2021244501A1 CN 2021097557 W CN2021097557 W CN 2021097557W WO 2021244501 A1 WO2021244501 A1 WO 2021244501A1
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WO
WIPO (PCT)
Prior art keywords
sci
transmission
timer
resource
running time
Prior art date
Application number
PCT/CN2021/097557
Other languages
English (en)
French (fr)
Inventor
张莉莉
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP21817878.8A priority Critical patent/EP4152862B1/en
Publication of WO2021244501A1 publication Critical patent/WO2021244501A1/zh
Priority to US18/060,116 priority patent/US20230106109A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/25—Control channels or signalling for resource management between terminals via a wireless link, e.g. sidelink
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/40—Resource management for direct mode communication, e.g. D2D or sidelink
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • This application relates to the field of communication technology, and in particular to a communication method and device.
  • the originating device can independently determine idle transmission resources, and then send sidelink control information (SCI) to the receiving device to reserve transmission resources. Transmission of data transmission information on the side link.
  • SCI sidelink control information
  • the receiving device can monitor the physical sidelink control channel (PSCCH) To obtain SCI. If the DRX duration timer is not running, the receiving device cannot monitor the PSCCH. Therefore, the receiving device cannot receive the SCI from the sending device in time. Since SCI can indicate the resource location of the pysical sidelink shared channel (PSSCH), if the receiving device does not receive the SCI, the receiving device cannot receive the data transmission information corresponding to the SCI. In turn, the data transmission delay is large.
  • PSSCH pysical sidelink shared channel
  • the embodiments of the present application provide a communication method and device, which can reduce data transmission delay.
  • this application provides a communication method, which can be executed by the receiving device.
  • the receiving device can be a terminal device or a component (such as a chip system) in the terminal device.
  • the method includes: after receiving the first SCI from the first originating device, the receiving end device starts a first timer according to the first SCI. Wherein, the running time of the first timer is used for the receiving end device to monitor the data transmission information of the second SCI and/or the side link.
  • the receiving device starts the first timer after receiving the first SCI from the first sending device. Since the receiving end device can monitor the data transmission information of the second SCI and/or side link during the running time of the first timer, the time during which the receiving end device is in the active period is prolonged to receive more times. Two SCI, to reduce the phenomenon that the second SCI is not received in time. Correspondingly, when the receiving end device monitors the second SCI in time, the receiving end device can also receive the data transmission information in time, reducing the data transmission delay.
  • the receiving device receiving the first SCI from the first sending device includes: within the running time of the second timer, the receiving device receiving the first SCI from the first sending device.
  • the running time of the second timer is used for the receiving end device to monitor the control information and/or data transmission information of the side link.
  • the receiving device cannot receive information from other devices. Even if the first sending device sends the first SCI to the receiving device, the receiving device cannot receive the first SCI.
  • the receiving device is in the active period and can receive information from other devices, which improves the success rate of receiving the first SCI by the receiving device.
  • the receiving end device starts the first timer according to the first SCI, including: if the data transmission indicated by the first SCI is the initial transmission, the receiving end device starts the first timer. If the data transmission indicated by the first SCI is a retransmission and the retransmitted data for the receiving device is a new transmission (that is, the previous transmission for the data was not detected by the receiving device), then the receiving device The end device starts the first timer.
  • the receiving device when the first SCI indication is new data or initial transmission data, the receiving device receives an SCI indicating the initial transmission; or, when the first SCI indication is retransmission data and the receiving device receives the data for the first time The first SCI, the receiving device receives an SCI indicating the initial transmission.
  • the first SCI indicates that the data is retransmitted and the receiving device receives the first SCI for the first time, it means that the receiving device receives the first SCI for scheduling the retransmitted data for the first time.
  • “Initial transmission” is for the terminal device that starts the DRX inactive timer.
  • the receiving device 2 does not receive the TB1 from the terminal device 1.
  • the failure to receive the TB1 from the terminal device 1 includes: the SCI from the terminal device 1 is not correctly demodulated, or the TB1 from the terminal device 1 is not received correctly.
  • the terminal device 2 does not start the DRX inactivation timer.
  • the terminal device 1 sends TB1 to the terminal device 2 again, the receiving device 2 receives the TB1 from the terminal device 1.
  • the terminal device 2 receives the TB1 for the first time, and the terminal device 2 starts the DRX inactivation timer.
  • the receiving TB1 from the terminal device 1 includes: correctly demodulating the SCI from the terminal device 1 or correctly receiving the TB1 from the terminal device 1.
  • initial transmission can also be called initial transmission.
  • the first timer specifies the length of time that the receiving device continues to be in the active state after successfully decoding a first SCI indicating the initial transmission, or when the receiving device successfully decodes an instruction retransmission for the first time or for the first time After the first SCI, the duration of continuous activation or on state.
  • the unit of the duration is any one of time slot, mini time slot and symbol.
  • the duration may be determined according to at least one of a time slot, a mini-slot or the number of symbols.
  • the receiving device Since the data transmission indicated by the first SCI is the initial transmission, or the receiving device receives the first SCI indicating the retransmission for the first time, there is a possibility that the information reception of the data transmission indicated by the first SCI fails. In the case that the receiving device fails to receive, the first timer of the receiving device has been started. In this way, in the next period of time, the receiving device is still in the active period and can continue to receive information from the first sending device. If the first sending end device retransmits the aforementioned data transmission information or initially transmits other data transmission information, the receiving end device can still receive the aforementioned data transmission information, which improves the information transmission efficiency of data transmission and improves detection reliability.
  • the side-link physical layer transmits the side-link HARQ process ID, new data indicator/indication (NDI), source (source, SRC) ID, Destination (DEST) ID, zone (zone) ID, HARQ enabled (enabled) state, HARQ disabled (disabled) state, reserved period (periodicity), reserved time domain resources and reserved frequency domain resources
  • NDI new data indicator/indication
  • SRC source
  • DEST Destination
  • zone zone
  • HARQ enabled (enabled) state HARQ disabled (disabled) state
  • reserved period reserved time domain resources
  • reserved frequency domain resources reserved frequency domain resources
  • the side link physical layer of the receiving end device transmits the reserved period, reserved time domain resources, side link HARQ process ID and NDI to the MAC layer.
  • the physical layer of the side link of the receiving end device transmits the reserved period, the reserved time domain resources and the side link HARQ process ID to the MAC layer.
  • the MAC entity of the MAC layer When implementing the DRX mechanism of the side link, the MAC entity of the MAC layer will monitor the PSCCH or SCI according to any timer or multiple timers of the side link. As an embodiment, the MAC entity monitors the PSCCH or the SCI according to at least one of the first timer, the second timer or the retransmission timer. As another embodiment, the MAC entity monitors the PSCCH according to at least one of the reserved period indicated by the first SCI, the reserved time domain resources, the reserved frequency domain resources, the side link HARQ process ID and the NDI.
  • the receiving device starts the first timer according to the first SCI, including: if the receiving device determines that the transmission on the side link indicated by the first SCI is a new transmission, the receiving device starts The first timer.
  • the receiving device starts the first timer according to the first SCI, including: if the first SCI indicates that the transmission on the side link is a new transmission, the receiving device starts the first timer; Or, if the first SCI indicates that the transmission on the side link is not a new transmission, and the transmission on the side link of the receiving device is a new transmission, the receiving device starts the first timer.
  • the first SCI indicates that the transmission of the side link is not a new transmission may specifically be: if the data transmission indicated by the first SCI is a retransmission and for the receiving device, the retransmitted data It is new data.
  • the data transmission indicated by the first SCI is a retransmission can also be understood as “the first SCI indicates that the data transmission scheduled this time is a retransmission”, or “the first SCI indicates that this is a data retransmission”.
  • the HARQ process number may be used in combination with the NDI to indicate, or the NDI may be used to indicate directly.
  • the transmission on the side link is a new transmission is determined by the receiving device.
  • “Indicate that the transmission on the side link is a new transmission” is the information in the first SCI sent by the first originating device.
  • the first SCI indicates the resource reservation period.
  • the second SCI includes at least: the SCI indicating that the data transmission of the side link is the initial transmission in the first target period and/or the second target period.
  • the first target period is the resource reservation period for receiving the first SCI.
  • the second target period is the resource reservation period after the first target period.
  • the communication method of the embodiment of the present application further includes: the receiving device receives the first configuration information from the network device.
  • the first configuration information indicates the running time of the first timer.
  • the first timer runs according to the running time indicated by the first configuration information, so as to facilitate the network device to manage the operating status of the first timer of the receiving device.
  • the communication method of the embodiment of the present application further includes: the receiving device determines the running time of the first timer based on at least one transmission resource indicated by the first SCI.
  • the at least one transmission resource indicated by the first SCI is a position of at least one transmission resource indicated by the first SCI, or a position of a time domain resource occupied by the at least one transmission resource indicated by the first SCI.
  • the first SCI indicates the resource location of at least one transmission resource, the at least one transmission resource includes a time domain resource used to carry the second SCI, and the running time of the first timer at least overlaps the time domain resource used to carry the second SCI.
  • the receiving end device when the receiving end device starts the first timer, the running time of the first timer at least overlaps with the time domain resources used to carry the second SCI, so that the first sending end device can send the receiving device to the receiving device through the reserved transmission resources.
  • the receiving device can receive the second SCI from the first originating device in time, avoiding the missed reception of the second SCI due to the fact that the receiving device is not in the activation period, thereby improving the second SCI The success rate of reception.
  • the running time of the first timer includes at least the time domain resource carrying the second SCI in the first transmission resource in the (F-1)th resource reservation period.
  • the time domain resource carrying the second SCI in the first transmission resource in the Fth resource reservation period overlaps with the running time of the second timer, and the first in the (F-1)th resource reservation period
  • the time domain resource carrying the second SCI in the transmission resource does not overlap with the running time of the second timer.
  • the first resource reservation period is the resource reservation period for receiving the first SCI, F is a positive integer, and F ⁇ 3.
  • the running time of the first timer includes at least the time domain resources carrying the second SCI in the first transmission resource in the (F-1)th resource reservation period, so, in the (F-1)th resource reservation In the first time domain resource that carries the second SCI in the cycle, the receiving device is still in the active period and can receive the second SCI carried in the first transmission resource, which improves the success rate of receiving the second SCI on the corresponding transmission resource .
  • the first or N time domain resources carrying the second SCI in the Fth resource reservation period overlap with the running time of the second DRX cycle of the second timer.
  • N is a positive integer.
  • the second DRX cycle is the DRX cycle after the first DRX cycle.
  • the first DRX cycle is the cycle of the second timer corresponding to the receiving moment of the first SCI.
  • the F-th resource reservation period overlaps with the "on duration" in different DRX periods of the second timer corresponding to the receiving moment of the first SCI.
  • the N time domain resources that carry the second SCI are the first N time domain resources that carry the second SCI in the F-th resource reservation period.
  • the at least one transmission resource indicated by the first SCI includes the first transmission resource, the running time of the first timer and the time domain resource carrying the second SCI in the first transmission resource in the second target period overlapping.
  • the second target period is a resource reservation period after the first target period
  • the first target period is a resource reservation period for receiving the first SCI.
  • the receiving device on the time domain resource carrying the second SCI in the first transmission resource in the second target period, the receiving device is in the active period and can receive the second SCI carried in the first transmission resource in the second target period. SCI reduces the phenomenon that the second SCI is not received in time.
  • the first transmission resource of the first target period is earlier than the transmission resource of the first SCI received, or the first transmission resource of the first target period is the transmission resource to which the first SCI belongs.
  • the receiving device can determine the first running time and the bearer second The time domain resources of the SCI overlap, which improves the reception success rate of the second SCI on the above-mentioned transmission resources.
  • the first transmission resource of the first target period is the transmission resource to which the first SCI belongs. If at least one transmission resource indicated by the first SCI further includes a second transmission resource, and the first transmission resource and the second transmission resource are in the same resource reservation period, and the first transmission resource is earlier than the second transmission resource, then the first timing The running time of the device also overlaps with the time domain resources of at least one of the following: the second transmission resource in the first target period carries the second SCI time domain resource; the second transmission resource in the second target period carries the second transmission resource Time domain resources of SCI.
  • the receiving device can also determine that the first running time overlaps with the time domain resource carrying the second SCI, thereby improving the reception of the second SCI on the transmission resource. Success rate.
  • the receiving device determines the running time of the first timer based on at least one transmission resource indicated by the first SCI, including: If there is a time domain resource that does not overlap the running time of the second timer in the time domain resources of the second SCI, the receiving device determines the running time of the first timer based on at least one transmission resource indicated by the first SCI; second timing The running time of the receiver is used to monitor the control information and/or data transmission information of the side link.
  • the end The device determines the first running time, so that the receiving device is activated on the time domain resource of the corresponding transmission resource, can monitor the second SCI, and reduce the phenomenon that the SCI is not received in time.
  • the running time of the first timer is continuous or discontinuous.
  • the receiving device when the first running time is continuous, the receiving device can be in the active period for a longer period of time to receive data from other devices (such as the first sending device, other sending devices other than the first sending device) , Network equipment, etc.) to reduce the phenomenon that SCI is not received in time.
  • the receiving end device can reduce the running time, and while improving the SCI receiving success rate, it can also save power consumption.
  • the running time of the first timer is continuous or non-continuous. If the resource reservation period indicated by the first SCI is greater than or equal to the second threshold, the running time of the first timer is non-continuous. Wherein, the first threshold is less than the second threshold.
  • the running time of the first timer is continuous or non-continuous. If the resource reservation period indicated by the first SCI is greater than the first threshold, the running time of the first timer is non-continuous.
  • the first running time is non-continuous to reduce the running time of the first timer, save the power consumption of the receiving device, and improve the SCI reception to a certain extent. Success rate.
  • the communication method of the embodiment of the present application further includes: after the receiving device receives the third SCI from the second sending device, starting the first timer corresponding to the third SCI.
  • the receiving end device starts the first timer according to the first SCI, including: the receiving end device starts the first timer corresponding to the first SCI.
  • the receiving device starts different first timers.
  • Each first timer runs according to its own running time, and the running time of different first timers does not affect each other, so there is no phenomenon that the running time of the first timer is covered, so that the receiving device can receive the SCI in time to Improve the success rate of SCI reception.
  • the receiving time of the third SCI is the same as the receiving time of the first SCI, or the receiving time of the third SCI is different from the receiving time of the first SCI.
  • the receiving device receives the first SCI and the third SCI at the same time, since different SCIs correspond to different first timers, the running times of different first timers do not affect each other, and there is no first timer.
  • the phenomenon that the running time of the timer is covered also increases the success rate of SCI reception.
  • the receiving time of the first SCI is earlier than the receiving time of the third SCI.
  • the running time of the first timer corresponding to the first SCI is the first running time
  • the running time of the first timer corresponding to the third SCI of the second originating device is the third running time.
  • the third running time includes the first running time.
  • the running time of the first timer started later includes the running time of the first timer started earlier. Even if part of the first timer fails, it can still ensure that the receiving device is in the time of the transmission resource indicated by the first SCI.
  • the domain resources are in the active period, and the SCI from the first originating device is received in a timely manner, which improves the success rate of receiving the SCI.
  • the third SCI indicates the resource location of at least one transmission resource.
  • the communication method of the embodiment of the present application further includes: the receiving end device determines a third running time according to the first running time and the third SCI.
  • the receiving end device when determining the third running time, still combines the reservation status of the transmission resource by the third SCI, so that the receiving end device can still successfully receive the SCI on the transmission resource reserved by the third SCI.
  • the receiving end device determines the third operating time according to the first operating time and the third SCI, including: the receiving end device determines the second operating time according to the third SCI, and then compares the first operating time to the third operating time.
  • the union of the second running time is taken as the third running time.
  • the second running time at least overlaps with the time domain resource carrying the SCI on the at least one transmission resource indicated by the third SCI.
  • the receiving device determines the running time of the first timer to be started later in a union manner, so that the running time of the first timer started later includes the running time of the first timer started earlier , To prevent the receiving end equipment from missing the control information and data transmission information on the reserved transmission resources.
  • the first SCI is the first level of the two-level SCI, or the first SCI is the second level of the two-level SCI, or the first SCI is the first level of the two-level SCI SCI and second level SCI.
  • this application provides a communication method, which can be executed by the originating device.
  • the originating device can be a terminal device or a component (such as a chip system) in the terminal device.
  • the method includes: after the originating device determines the k first transmission resources, the originating device sends the first SCI to the receiving device on the k first transmission resources.
  • the time domain resource carrying the first SCI among the k first transmission resources overlaps the running time of the second timer, k is a positive integer, and k ⁇ 1.
  • the k first transmission resources are the transmission resources reserved by the originating device.
  • the running time of the second timer is used by the originating device to monitor the control information and/or data transmission information of the side link.
  • the originating device determines that the time domain resource carrying the first SCI among the k first transmission resources overlaps with the running time of the second timer. Because the running time of the second timer of the sending device and the receiving device are the same. In this way, when the originating device sends the first SCI on the k first transmission resources, the receiving device is in the active period and can receive the first SCI, thereby making the receiving device more likely to receive the first SCI in time, and increasing the first SCI. The transmission efficiency of SCI.
  • the k first transmission resources are the first k first transmission resources among the K first transmission resources.
  • the K first transmission resources are the transmission resources reserved by the originating device.
  • K is a positive integer, and K ⁇ k.
  • the first transmission resources can all indicate the reserved transmission resources forward, that is, if the receiving device receives the first SCI transmitted on the k first transmission resources, the receiving device can according to the first SCI.
  • An SCI indicates the status of the transmission resource, determines the first transmission resource after the k first transmission resources, and then continues to receive the first SCI on the first transmission resource after the k first transmission resources to improve the utilization of transmission resources , So that the receiving device can receive more first SCI.
  • k is a predefined parameter.
  • the communication method of the embodiment of the present application further includes: the originating device receives the second configuration information from the network device. Wherein, the second configuration information indicates the value of k.
  • the originating device can reserve the first transmission resource that overlaps the running time of the second timer according to the predefined value or the value of k indicated by the second configuration information.
  • determining the k first transmission resources by the originating device includes: the originating device detects the signal strength of the second transmission resource. Wherein, the second transmission resource overlaps with the running time of the preset timer. The originating device determines at least K first transmission resources according to the signal strength of the second transmission resource. The originating device determines the k first transmission resources from the at least K first transmission resources according to the overlap condition of the running time of the at least K first transmission resources and the second timer.
  • the preset timer includes at least one of the following timers: a first timer, a second timer, and a retransmission timer. Wherein, the running time of the first timer is used for the originating device to monitor the control information and/or data transmission information of the side link.
  • the originating device when the originating device executes the DRX mechanism of the side link, it can also reserve k first transmission resources, which overlap with the running time of the second timer. Because the running time of the second timer of the sending end device and the receiving end device are the same. Therefore, when the originating device sends the first SCI to the receiving device through k first transmission resources, the receiving device is also in the active period, and can receive the first SCI from the originating device, thereby improving the transmission of the first SCI. Effectiveness.
  • the originating device determines at least K first transmission resources according to the signal strength of the second transmission resource, including: if the running time of the second transmission resource and the preset timer overlaps and satisfies the preset duration, Then, the originating device determines at least K first transmission resources according to the signal strength of the second transmission resource.
  • the signal strength of the second transmission resource includes at least one of a reference signal received power RSRP, a received signal strength indicator RSSI, and a signal-to-interference-to-noise ratio SINR.
  • the first SCI indicates a resource reservation period
  • the k first transmission resources are transmission resources in one resource reservation period. That is to say, when the originating device implements the DRX mechanism of the side link, it can also reserve periodic transmission resources.
  • the first SCI is the first level of the two-level SCI, or the first SCI is the second level of the two-level SCI, or the first SCI is the first level of the two-level SCI SCI and second level SCI.
  • the present application provides a communication device, which may be the receiving device in the above-mentioned first aspect.
  • the device includes a processor, transceiver, and memory.
  • the transceiver is used to receive the first SCI from the first originating device.
  • the processor is used to start the first timer according to the first SCI.
  • the running time of the first timer is used for the receiving end device to monitor the second SCI and/or the data transmission information of the data transmission information side link.
  • the transceiver is specifically configured to receive the first SCI from the first originating device within the running time of the second timer.
  • the running time of the second timer is used for the receiving end device to monitor the control information and/or data transmission information of the side link.
  • the processor is specifically configured to: if it is determined that the transmission on the side link indicated by the first SCI is a new transmission, start the first timer.
  • the processor is specifically configured to: if it is determined that the transmission on the side link indicated by the first SCI is a new transmission, start the first timer. Or, if the first SCI indicates that the transmission on the side link is not a new transmission, and the transmission on the side link of the receiving device is a new transmission, the first timer is started.
  • the second SCI includes at least: the SCI indicating that the data transmission of the side link is the initial transmission in the first target period or the data transmission indicating the side link is the initial transmission in the second target period SCI.
  • the first target period is the resource reservation period for receiving the first SCI; the second target period is the resource reservation period after the first target period.
  • the transceiver is used to receive the first configuration information from the network device.
  • the first configuration information indicates the running time of the first timer.
  • the first SCI indicates the resource location of at least one transmission resource
  • the at least one transmission resource indicated by the first SCI includes a time domain resource for carrying the second SCI
  • the processor is further configured to The indicated at least one transmission resource determines the running time of the first timer. Wherein, the running time of the first timer at least overlaps with the time domain resource used to carry the second SCI.
  • the running time of the first timer includes at least the time domain resource carrying the second SCI in the first transmission resource in the (F-1)th resource reservation period.
  • the time domain resource carrying the second SCI in the first transmission resource in the Fth resource reservation period overlaps with the running time of the second timer, and the first in the (F-1)th resource reservation period
  • the time domain resource carrying the second SCI in the transmission resource does not overlap with the running time of the second timer;
  • the first resource reservation period is the resource reservation period for receiving the first SCI;
  • F is a positive integer, and F ⁇ 3.
  • the first or N time domain resources carrying the second SCI in the Fth resource reservation period overlap with the running time of the second DRX cycle of the second timer.
  • the second DRX cycle is the DRX cycle after the first DRX cycle;
  • the first DRX cycle is the cycle of the second timer corresponding to the receiving moment of the first SCI.
  • N is a positive integer.
  • the N time domain resources that carry the second SCI are the first N time domain resources in the Fth resource reservation period.
  • the running time of the first timer overlaps with the time domain resource carrying the second SCI in the first transmission resource in the second target period.
  • the second target period is a resource reservation period after the first target period; the first target period is a resource reservation period for receiving the first SCI; at least one transmission resource indicated by the first SCI includes the first transmission resource.
  • the first transmission resource of the first target period is earlier than the transmission resource of the first SCI received; or, the first transmission resource of the first target period is the transmission resource to which the first SCI belongs.
  • the first transmission resource of the first target period is the transmission resource to which the first SCI belongs. If at least one transmission resource indicated by the first SCI further includes a second transmission resource, and the first transmission resource and the second transmission resource are in the same resource reservation period, and the first transmission resource is earlier than the second transmission resource, then the first timing The running time of the device also overlaps with the time domain resources of at least one of the following: the second transmission resource in the first target period carries the second SCI time domain resource; the second transmission resource in the second target period carries the second transmission resource Time domain resources of SCI.
  • the processor is specifically configured to: if in the resource reservation period after the resource reservation period at the current moment, at least one of the time domain resources carrying the second SCI is not connected to the second timer For time domain resources with overlapping running times, the running time of the first timer is determined.
  • the running time of the first timer is continuous or discontinuous.
  • the running time of the first timer is continuous or non-continuous; if the resource reservation indicated by the first SCI If the period is greater than or equal to the second threshold, the running time of the first timer is discontinuous; wherein, the first threshold is less than the second threshold.
  • the running time of the first timer is continuous or discontinuous; if the resource reservation period indicated by the first SCI If it is greater than the first threshold, the running time of the first timer is non-continuous.
  • the transceiver is also used to receive the third SCI from the second originating device.
  • the processor is also used to start the first timer corresponding to the third SCI.
  • the processor is further configured to: start a first timer corresponding to the first SCI.
  • the receiving time of the third SCI is the same as the receiving time of the first SCI, or the receiving time of the third SCI is different from the receiving time of the first SCI.
  • the third running time includes the first running time; where the first running time is the first timing corresponding to the first SCI The running time of the device; the third running time is the running time of the first timer corresponding to the second SCI of the second originating device.
  • the third SCI indicates the resource location of at least one transmission resource; the processor is further configured to determine the third running time according to the first running time and the third SCI.
  • the processor is specifically configured to: determine the second running time according to the third SCI. Wherein, the second running time at least overlaps with the time domain resource carrying the SCI on the at least one transmission resource indicated by the third SCI.
  • the processor is specifically configured to: use the union of the first running time and the second running time as the third running time.
  • the first SCI is the first SCI of the two-level SCI; or, the first SCI is the second SCI of the two-level SCI; or, the first SCI is the second SCI of the two-level SCI.
  • the present application provides a communication device, which may be the originating device in the foregoing second aspect.
  • the device includes a processor, transceiver, and memory.
  • the processor is configured to determine k first transmission resources, where the time domain resources carrying the first SCI among the k first transmission resources overlap with the running time of the second timer; k is a positive integer, and k ⁇ 1; k
  • the first transmission resource is a transmission resource reserved by the originating device; the running time of the second timer is used by the originating device to monitor control information and/or data transmission information of the side link.
  • the transceiver is used to send the first SCI to the receiving device on the k first transmission resources.
  • the k first transmission resources are the first k first transmission resources among the K first transmission resources; the K first transmission resources are the transmission resources reserved by the originating device; K is positive Integer, and K ⁇ k.
  • k is a predefined parameter; or, the transceiver is used to receive the second configuration information from the network device.
  • the second configuration information indicates the value of k.
  • the processor is specifically configured to: detect the signal strength of the second transmission resource; wherein the second transmission resource overlaps the running time of the preset timer; and determine at least the signal strength of the second transmission resource K first transmission resources; determine the k first transmission resources from the at least K first transmission resources according to the overlap condition of the running time of the at least K first transmission resources and the second timer.
  • the preset timer includes at least one of the following timers: a first timer; a second timer; and a retransmission timer.
  • the running time of the first timer is used for the control information and/or data transmission information of the receiving side uplink of the sending device.
  • the processor is specifically configured to: if the running time of the second transmission resource overlaps with the preset timer and satisfies the preset duration, determine at least K first transmission resources according to the signal strength of the second transmission resource. Transmission resources.
  • the signal strength of the second transmission resource includes at least one of a reference signal received power RSRP, a received signal strength indicator RSSI, and a signal-to-interference-to-noise ratio SINR.
  • the first SCI indicates a resource reservation period
  • the k first transmission resources are transmission resources in one resource reservation period.
  • the first SCI is the first level of the two-level SCI, or the first SCI is the second level of the two-level SCI, or the first SCI is the first level of the two-level SCI SCI and second level SCI.
  • this application provides a communication device for implementing the functions of the receiving end device in the first aspect described above.
  • an embodiment of the present application provides a communication device, which has a function of implementing the communication method in any one of the foregoing first aspects.
  • This function can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above-mentioned functions.
  • a communication device including: a processor and a memory; the memory is used to store computer execution instructions, and when the communication device is running, the processor executes the computer execution instructions stored in the memory to enable the communication
  • the device executes the communication method as in any one of the above-mentioned first aspect.
  • an embodiment of the present application provides a communication device, including: a processor; the processor is configured to couple with a memory, and after reading an instruction in the memory, execute the communication method according to any one of the above-mentioned first aspects according to the instruction .
  • the present application provides a communication device for implementing the function of the receiving end device in the second aspect described above.
  • an embodiment of the present application provides a communication device, which has a function of implementing the communication method in any one of the foregoing second aspects.
  • This function can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above-mentioned functions.
  • an embodiment of the present application provides a communication device, including: a processor and a memory; the memory is used to store computer execution instructions, and when the communication device is running, the processor executes the computer execution instructions stored in the memory , So that the communication device executes the communication method according to any one of the above-mentioned second aspects.
  • a communication device including: a processor; the processor is configured to couple with a memory, and after reading instructions in the memory, execute the communication method according to any one of the above second aspects according to the instructions.
  • a computer-readable storage medium stores instructions that, when run on a computer, enable the computer to execute the communication method of any one of the foregoing aspects.
  • a computer program product containing instructions which when running on a computer, enables the computer to execute the communication method of any one of the above-mentioned aspects.
  • a circuit system in a fifteenth aspect, includes a processing circuit configured to execute the communication method according to any one of the foregoing aspects.
  • a chip in a sixteenth aspect, includes a processor, and the processor is coupled with a memory.
  • the memory stores program instructions. When the program instructions stored in the memory are executed by the processor, the communication method of any one of the above aspects is implemented.
  • a communication system in a seventeenth aspect, includes the receiving device in any one of the foregoing first aspects and the first sending device in any one of the first aspects, or includes any of the foregoing first aspects.
  • the receiving device in one aspect, the first sending device in any one of the first aspects, and the second sending device in any one of the first aspects, or the receiving device in any one of the above second aspects.
  • the device and the originating device in either aspect of the second aspect.
  • FIG. 1 is a schematic diagram of a discontinuous reception period provided by an embodiment of this application.
  • FIG. 2 is a schematic diagram of another discontinuous reception period provided by an embodiment of this application.
  • FIG. 3 is a schematic diagram of a process of reserving transmission resources according to an embodiment of the application
  • FIG. 4 is a schematic diagram of the distribution of transmission resources provided by an embodiment of this application.
  • FIG. 5 is a schematic diagram of another transmission resource distribution provided by an embodiment of this application.
  • FIG. 6 is a schematic diagram of the architecture of a communication system provided by an embodiment of this application.
  • FIG. 7 is a schematic structural diagram of still another communication system provided by an embodiment of this application.
  • FIG. 8 is a schematic flowchart of a communication method provided by an embodiment of this application.
  • FIG. 9(a) is a schematic diagram of the operating status of a first timer provided by an embodiment of this application.
  • FIG. 9(b) is a schematic diagram of still another operating condition of the first timer provided by an embodiment of this application.
  • FIG. 9(c) is a schematic diagram of another operating condition of the first timer provided by an embodiment of this application.
  • FIG. 9(d) is a schematic diagram of another operating condition of the first timer provided by an embodiment of this application.
  • FIG. 10(a) is a schematic diagram of another operating status of a first timer provided by an embodiment of this application.
  • FIG. 10(b) is a schematic diagram of another operating condition of the first timer provided by an embodiment of this application.
  • FIG. 10(c) is a schematic diagram of another operating condition of the first timer provided by an embodiment of this application.
  • FIG. 11 is a schematic flowchart of another communication method provided by an embodiment of this application.
  • FIG. 12 is a schematic diagram of another operating condition of a first timer provided by an embodiment of this application.
  • FIG. 13 is a schematic diagram of another operating status of a first timer provided by an embodiment of the application.
  • FIG. 14 is a schematic flowchart of another communication method provided by an embodiment of this application.
  • 15 is a schematic diagram of the operating status of a second timer provided by an embodiment of this application.
  • FIG. 16 is a schematic flowchart of another communication method provided by an embodiment of this application.
  • FIG. 17 is a schematic diagram of a location of resource reservation provided by an embodiment of this application.
  • FIG. 18 is a schematic structural diagram of a communication device provided by an embodiment of this application.
  • FIG. 19 is a schematic structural diagram of still another communication device provided by an embodiment of this application.
  • first and second in the description of the application and the drawings are used to distinguish different objects, or to distinguish different processing of the same object, rather than describing a specific order of the objects.
  • the terms “including” and “having” mentioned in the description of this application and any variations thereof are intended to cover non-exclusive inclusions.
  • a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes other steps or units that are not listed, or optionally also Including other steps or units inherent to these processes, methods, products or equipment.
  • “a plurality of” includes two or more than two.
  • words such as “exemplary” or “for example” are used as examples, illustrations, or illustrations. Any embodiment or design solution described as “exemplary” or “for example” in the embodiments of the present application should not be construed as being more preferable or advantageous than other embodiments or design solutions. To be precise, words such as “exemplary” or “for example” are used to present related concepts in a specific manner.
  • the network device can configure the DRX mechanism to the terminal device.
  • DRX mechanisms can be divided into two types: idle DRX and connected mode discontinuous reception (C-DRX). The two implementation mechanisms are different. Among them, in the idle state DRX, the terminal device mainly monitors the paging of the network device, and the terminal device monitors a paging occasion (paging occasion) in a DRX cycle (DRX cycle).
  • C-DRX connected mode discontinuous reception
  • a DRX cycle includes at least one DRX-on duration timer (DRX-on duration timer) and a possible period of sleep (opportunity for DRX) time.
  • DRX-on duration timer DRX-on duration timer
  • sleep opportunity for DRX
  • the time of a DRX duration timer is also called “on duration”
  • a period of sleep is also called “sleep period” which refers to the non-active time in the DRX cycle.
  • the terminal device does not need to monitor the PDCCH.
  • DRX cycles there can be two types of DRX cycles, namely, long DRX cycle (long DRX cycle, LDC) and short DRX cycle (short DRX cycle, SDC).
  • long DRX cycle long DRX cycle
  • short DRX cycle short DRX cycle
  • the network device configures the DRX parameters for the terminal device, it needs to configure the parameters of the long DRX cycle, and optionally, the parameters of the short DRX cycle can also be configured.
  • terminal devices all need to configure the parameters of the long DRX cycle, and the cycle length of the long DRX cycle of different terminal devices can be the same or different.
  • the short DRX cycle is an optional configuration of the system, that is, in addition to the long DRX cycle configured for each terminal device, a short DRX cycle can also be configured.
  • the cycle length of the long DRX cycle is an integer multiple of the cycle length of the short DRX cycle, and the duration of the long DRX cycle overlaps with part of the duration of the short DRX cycle, as shown in FIG. 1.
  • the duration of one long DRX cycle includes the duration of two short DRX cycles, and the duration of one long DRX cycle is the same as and overlaps with the duration of one short DRX cycle.
  • a terminal device After a terminal device is scheduled to receive or send data information in a certain subframe, it is likely to continue to be scheduled in the next few subframes. If it has to wait until the next DRX cycle to receive or send these data information, it will be Come extra delay. In order to reduce the aforementioned delay, after being scheduled, the terminal device continues to be in the active period, that is, continuously monitors the PDCCH during the configured active period.
  • the implementation mechanism is: Whenever a terminal device is scheduled to transmit data initially, it will start (or restart) a DRX inactivity timer, and the terminal device will remain in the active state until the DRX inactivity timer expires. .
  • the DRX inactivation timer specifies the number of consecutive subframes that are continuously in the active state after the terminal device successfully decodes a PDCCH indicating the initial transmission. That is, the DRX inactive timer is restarted every time a terminal device has data to be transmitted initially.
  • the active period includes the running time of the DRX duration timer and the running time of the DRX inactive timer.
  • the function of the DRX inactive timer is to reduce the processing delay of data information. However, if the duration of the DRX inactivation timer is set too long, and the DRX inactivation timer has not expired after the data information of the network device is sent, the terminal device still continues to monitor the PDCCH and cannot enter the dormant state in time . In order to make the terminal device enter the dormant state as quickly as possible, the system introduces a predetermined media access control (MAC) control element (CE), that is, the DRX command MAC control element (DRX command MAC CE), Also known as the sleep control element (go-to-sleep CE).
  • MAC media access control
  • CE DRX command MAC control element
  • sleep control element go-to-sleep CE
  • the network device If the network device detects that there is no transmission of uplink data information and downlink data information, the network device sends a MAC protocol data unit (protocol data unit, PDU) to the terminal device.
  • PDU protocol data unit
  • the terminal is set to receive the MAC PDU from the network device.
  • the MAC PDU includes the above-mentioned DRX command MAC control element. The terminal device enters the dormant state according to the MAC control element of the DRX command.
  • the terminal device periodically starts the DRX duration timer according to the configured DRX cycle parameters.
  • the running time of the DRX duration timer is shown by the thin solid line in Figure 2.
  • the terminal device can receive the PDCCH from the network device. Among them, the time when the terminal device can detect or receive the PDCCH is shown by the thick solid line in FIG. 2.
  • the network device sends the PDCCH to the terminal device.
  • the terminal device receives the PDCCH from the network device.
  • the terminal device starts the DRX inactive timer.
  • the running time of the DRX inactive timer is shown by the dotted line in Figure 2.
  • the network device sends the DRX command MAC control element to the terminal device.
  • the terminal device receives the DRX command MAC control element from the network device.
  • the DRX duration timer and the DRX inactivation timer of the terminal device are both in operating conditions.
  • the terminal device stops the DRX duration timer and the DRX inactivation timer according to the DRX command MAC control element, and the terminal device no longer receives the PDCCH, as shown by the thick solid line in Figure 2.
  • the terminal device enters the dormant state.
  • Network equipment configures DRX parameters to terminal equipment through RRC signaling, such as DRX cycle (DRX cycle), DRX duration timer (drx-on duration timer), DRX inactive timer, DRX hybrid automatic repeat request round-trip time timer (drx-hybrid auto repeat request round trip timer, drx-HARQ-RTT-Timer), DRX retransmission timer (drx-retransmission timer) and other timer parameters.
  • the terminal equipment is required during the DRX duration timer, DRX inactive timer, downlink (DL) DRX retransmission timer, and uplink (uplink, UL) DRX retransmission timer. Monitoring the PDCCH, these times are also collectively referred to as active time.
  • the terminal device can enter the dormant state without monitoring the PDCCH.
  • the DRX duration timer instructs the terminal equipment to continuously monitor the PDCCH duration at the beginning of the DRX cycle.
  • the duration may refer to the number of subframes.
  • DRX inactive timer When the terminal device detects that the PDCCH is used for scheduling uplink or downlink initial data transmission, it starts (or restarts) the timer and keeps monitoring the PDCCH for the duration of time.
  • the DRX hybrid automatic repeat request round-trip time timer including the uplink drx-HARQ-RTT-Timer and the downlink drx-HARQ-RTT-Timer, the downlink drx-HARQ-RTT-Timer indicates that the terminal device expects to receive downlink retransmissions
  • the minimum time period before assignment (assignment) indicates the minimum time period before the terminal device expects to receive the uplink retransmission authorization.
  • DRX retransmission timer includes UL’s DRX retransmission timer and DL’s DRX retransmission timer.
  • the DL DRX retransmission timer is used to specify the maximum duration that terminal equipment expects to obtain downlink retransmissions.
  • UL The DRX retransmission timer is used to specify the maximum time period that the terminal device expects to obtain the uplink retransmission authorization.
  • the DRX parameters also include the DRX start offset (DRX start offset) and the number of subframes in the long DRX cycle.
  • DRX start offset refers to the start subframe of the DRX cycle.
  • the number of subframes in a long DRX cycle refers to the number of subframes occupied by one long DRX cycle.
  • the above two parameters are both determined by the long DRX cycle start offset (longDRX-cycle start offset) field.
  • transmission mode 1 is also referred to as mode 1 for short
  • transmission mode 2 is also referred to as mode 2 for short.
  • transmission mode 1 the transmission resources of the terminal equipment are allocated by the network equipment, and the terminal equipment transmits information on the transmission resources allocated by the network equipment.
  • the network device allocates a single transmission resource to the terminal device, and can also allocate a periodic transmission resource to the terminal device.
  • the terminal device uses sensing + reservation to determine transmission resources.
  • the specific processing procedure of the terminal device 1 includes:
  • Step 1 The terminal device 1 obtains the data information to be sent.
  • the terminal device 1 has new data information arriving at or near time n, and it needs to send data information to other terminal devices 1.
  • Step 2 The terminal device 1 determines a sensing window.
  • the listening window is the preset duration before time n, such as 1000ms.
  • nT 0 the start time of the listening window
  • nT proc,0 the end time of the listening window
  • the terminal device 1 may perform step one first, then perform step two, or perform step two first, then perform step one, or perform step one and step two at the same time.
  • the embodiment of the present application performs step one and step two The order is not limited.
  • Step 3 The terminal device 1 determines a resource selection window.
  • the resource selection window is the preset duration after n time.
  • the starting time of the resource selection window is recorded as: n+T 1
  • the ending time of the resource selection window is recorded as: n+T 2 .
  • Step 4 The terminal device 1 selects a transmission resource in the resource selection window according to the listening result of the listening window to transmit data information.
  • the listening result includes the detection result of the physical sidelink control channel (PSCCH) and the reference signal received power (reference signal) of the physical sidelink shared channel (PSSCH) corresponding to the PSCCH. signal received power (RSRP) measurement value.
  • PSCCH physical sidelink control channel
  • reference signal reference signal received power
  • RSRP signal received power
  • the reserved transmission resources can be periodic or aperiodic. If the reserved transmission resources are periodic, at most N max transmission resources are reserved in one resource reservation period. Transmission resources in different resource reservation periods can transmit the same TB block or different TB blocks. Transmission resources in the same resource reservation period transmit the same TB block. In addition, transmission resources in the same resource reservation period can also transmit different TB blocks.
  • one resource reservation period includes three transmission resources, which can be denoted as transmission resource 1, transmission resource 2, and transmission resource 3, respectively.
  • the receiving device successfully receives TB1 on transmission resource 1. In this case, the receiving device feeds back an acknowledgement (ACK) message to the sending device.
  • ACK acknowledgement
  • In order to improve the utilization of transmission resources there is no need to continue to transmit TB1 on transmission resource 2 or transmission resource 3, and other transmission blocks, such as TB2, can be transmitted.
  • step three Before step three is performed, all resources in the resource selection window are formed into a candidate resource set S_A, and The number of resources in the candidate resource set S_A is A.
  • the PSCCH corresponding to the PSSCH indicates that the terminal device 2 that sends the PSCCH reserves the time-frequency resources required for subsequent transmission (for example, in Figure 3 ,
  • the time-frequency resource reserved by the terminal device 2 that sends the PSCCH is the time-frequency resource A1) corresponding to the resource A in the listening window and located 100ms, 200ms, 300ms, ... etc. in the time domain after the resource A
  • the terminal device 1 excludes the transmission resources reserved by the terminal device 2 from the candidate resource set S_A. At this time, remember that the number of resources remaining in the candidate resource set S_A is equal to B.
  • the terminal device determines the transmission resource used to transmit data information from the remaining B resources in the candidate resource set S_A.
  • the resource reservation period of the transmission resource is T.
  • the thin solid line box represents the transmission resource used to transmit TB1
  • the thick solid line box represents the transmission resource used to transmit TB2, that is, in the scenario shown in FIG. 4, different resource reservation periods transmit different TBs.
  • Step 5 The terminal device 1 sends the transmission block on the selected transmission resource.
  • one transmission block includes the SCI and data information, or one transmission block is the PSSCH scheduled by the SCI.
  • SCI includes data transmission process number and resource reservation information.
  • the data transmission process number corresponds to the process of transmitting data information, so that the receiving end device can receive the data information.
  • the resource reservation information includes the number of reserved transmission resources N max .
  • the resource reservation information further includes the resource reservation period. In this case, N max represents the number of transmission resources reserved in a resource reservation period.
  • FIG. 5 Exemplarily, still taking the reserved transmission resources as periodic transmission resources as an example, refer to FIG. 5.
  • three transmission resources are reserved in one resource reservation period.
  • the area represented by the thick solid line box in FIG. 5 indicates the transmission resource carrying SCI
  • the area represented by the thin solid line box in FIG. 5 indicates the transmission resource carrying data information.
  • the dotted line with an arrow in FIG. 5 indicates that the SCI includes a data transmission process number for receiving data information.
  • the solid line with arrows in Figure 5 indicates that the SCI includes resource reservation information.
  • the SCI can forward (forward) indicate the reserved transmission resources.
  • the solid line from the first transmission resource to the second transmission resource indicates: The SCI in each transmission resource is used to indicate the resource location of the reserved second transmission resource.
  • the solid line from the first transmission resource to the third transmission resource indicates that the SCI in the first transmission resource is used to indicate the resource location of the reserved third transmission resource.
  • the solid line from the second transmission resource to the third transmission resource indicates: the SCI in the second transmission resource is used to indicate the reserved third transmission resource Resource location.
  • the SCI can also indicate the reserved transmission resources backward (past/backward).
  • the solid line from the third transmission resource to the second transmission resource indicates: third The SCI in each transmission resource is used to indicate the resource location of the reserved second transmission resource.
  • the solid line from the third transmission resource to the first transmission resource indicates that the SCI in the third transmission resource is used to indicate the resource location of the reserved first transmission resource.
  • the solid line from the second transmission resource to the first transmission resource indicates: the SCI in the second transmission resource is used to indicate the reserved first transmission resource Resource location.
  • the SCI can also indicate both forward and backward.
  • the number of transmission resources indicated forward may be a first value configured by the network device or a predefined value
  • the number of transmission resources indicated backward may be a first value configured by the network device or a predefined value.
  • Two value may be the same value or different values.
  • only the reserved transmission resource may be indicated backward.
  • the SCI can also indicate which of the reserved transmission resources the transmission resource carrying the SCI is.
  • N P represents the number of transmission resources before the transmission resource carrying the SCI in the same resource reservation period.
  • the first timer may be specifically implemented as a DRX inactive timer
  • the second timer may be specifically implemented as a DRX duration timer.
  • Transmission resources include time domain resources and frequency domain resources, or transmission resources specifically refer to time domain resources. Transmission resources are also referred to as resources.
  • Data information and “data” refer to the same meaning and can be substituted for each other.
  • Transport block and “data packet” refer to the same meaning and can be substituted for each other.
  • overlap between A and B means that the resources occupied by A and B in the time domain are the same.
  • receiving SCI includes: detecting SCI, and/or decoding (or demodulating, or analyzing) SCI.
  • “received” means “received”
  • “unreceived” means “not received”.
  • receiving can be understood as receiving correctly.
  • monitoring and detection can be replaced with each other.
  • the pre-configuration may be pre-configuration through radio resource control (radio resource control, RRC) signaling from a network device, or PC5 RRC signaling pre-configuration, or pre-defined.
  • RRC radio resource control
  • ... is used for monitoring, which can be understood as being used for monitoring.
  • New transmission can be understood as new data transmission, or new data transmission, or data transmission for the first time.
  • transmission and data transmission are interchangeable.
  • ...Indication..., or any configuration indication... its meaning is: any configuration can contain multiple cells. Among them, one cell is used to indicate...
  • the receiving device can monitor the PSCCH to obtain the SCI. If the DRX duration timer is not running, the receiving device cannot monitor the PSCCH. Therefore, the receiving device cannot receive the SCI from the sending device in time. Since SCI can indicate the resource location of the pysical sidelink shared channel (PSSCH), if the receiving device does not receive the SCI, the receiving device cannot receive the data transmission corresponding to the SCI. Information, which in turn leads to long data transmission delays. Optionally, the receiving device can monitor the PSCCH during the activation period to obtain the SCI.
  • PSSCH pysical sidelink shared channel
  • an embodiment of the present application provides a communication method.
  • the communication method of the embodiment of the present application may be applicable to a system for communication between terminal devices, such as a V2X communication system and a device-to-device (D2D) system.
  • the communication system includes at least two terminal devices 60, and the two terminal devices 60 can directly communicate through a side link.
  • the communication system further includes a network device 70.
  • the terminal device 60 can also communicate with the network device 70 (only two terminal devices 60 are shown in FIGS. 6 and 7).
  • the terminal device 60 is mainly used to receive or send data.
  • the terminal device 60 involved in the embodiments of the present application may be a device or a component in a device that realizes the functions of the terminal device 60.
  • the terminal device 60 includes, for example, but not limited to, various handheld devices with wireless communication functions. , In-vehicle devices, wearable devices, computing devices, or other processing devices connected to wireless modems; can also include subscriber units, cellular phones, smart phones, wireless data cards, and personal digital Assistant (personal digital assistant, PDA) computer, tablet computer, handheld device (handheld), laptop computer (laptop computer), machine type communication (machine type communication, MTC) terminal (terminal), user equipment (user equipment, UE), mobile terminal, etc.
  • PDA personal digital assistant
  • MTC machine type communication
  • terminal terminal
  • user equipment user equipment
  • UE mobile terminal
  • the terminal device 60 may be a component in any of the foregoing devices (for example, the terminal device 60 may refer to a chip system in any of the foregoing devices).
  • the terminal device 60 involved in the embodiments of the present application may also be a vehicle-mounted module, vehicle-mounted module, vehicle-mounted component, vehicle-mounted chip, or vehicle-mounted unit that is built into a vehicle as one or more components or units.
  • An in-vehicle module, an in-vehicle module, an in-vehicle component, an in-vehicle chip, or an in-vehicle unit may implement the method of the present application.
  • the terminal device may also be referred to as a terminal, which is described here in a unified manner, and will not be described in detail below.
  • the network device 70 is a device deployed on a wireless access network to provide wireless communication functions.
  • the network device 70 may refer to a device that communicates with the wireless terminal device 60 through one or more cells on the air interface of the access network.
  • the device that realizes the function of the network device 70 may be the network device 70 or A device that supports the network device 70 to implement this function (for example, a chip in the network device 70).
  • the network device 70 may perform attribute management on the air interface.
  • the base station equipment can also coordinate the attribute management of the air interface.
  • the network equipment 70 includes various forms of macro base stations, micro base stations (also called small stations), relay equipment such as relay stations or relay equipment chips, transmission reception points (TRP), and evolved network nodes ( evolved Node B (eNB), next-generation network node (g Node B, gNB), evolved Node B (ng-evolved Node B, ng-eNB) connected to the next-generation core network, etc.
  • the network device 70 may be a baseband unit (BBU) and a remote radio unit (RRU), in the cloud radio access Netowrk (CRAN)
  • BBU pool baseband pool
  • RRU cloud radio access Netowrk
  • the communication systems shown in Figures 6 and 7 can be applied to the current long term evolution (LTE) or advanced long term evolution (LTE advanced, LTE-A) systems, and can also be applied to the 5G network currently under development Or in other networks in the future, of course, it can also be applied to a system of LTE and 5G hybrid networking, or in other systems, which is not specifically limited in the embodiment of the present application.
  • LTE long term evolution
  • LTE advanced, LTE-A advanced long term evolution
  • LTE advanced, LTE-A advanced long term evolution
  • the network device 70 and the terminal device 60 in the aforementioned communication system may correspond to different names. Those skilled in the art can understand that the names do not constitute a limitation on the devices themselves.
  • the embodiment of the present application provides a communication method, which is applied in the data transmission process of the side link.
  • the communication method includes the following steps:
  • the first originating device sends the first SCI to the receiving device.
  • the receiving device receives the first SCI from the first sending device.
  • the receiving device is in the active period before it can monitor at least one of the control information of the side link and the information of data transmission.
  • the first SCI is the first level of the two-level SCI, or the first SCI is the second-level SCI of the two-level SCI, or the first SCI is the first-level SCI and the second-level SCI of the two-level SCI .
  • S801 may be specifically implemented as including: during the running time of the second timer of the receiving device, the receiving device receives the first SCI from the first sending device.
  • the running time of the second timer of the receiving end device is used for the receiving end device to monitor at least one of side link control information and data transmission information.
  • exemplary, ... is used for monitoring, which can be understood as being used for monitoring.
  • the running time of the second timer is used for the end device to monitor the control information and data information of the side link. It can be understood that the running time of the second timer is used for the end device to monitor the control information of the side link. And data information.
  • the second timer may be a DRX duration timer, or other timers capable of realizing the function of the DRX duration timer, which is not limited in the embodiment of the present application.
  • the receiving device cannot receive information from other devices (such as the first sending device, other sending devices and network devices other than the first sending device). Even if the first sending device sends the first SCI to the receiving device, the receiving device cannot receive the first SCI.
  • the receiving device is in the active period and can receive information from other devices, which improves the success rate of receiving the first SCI by the receiving device.
  • the receiving device starts a first timer according to the first SCI.
  • the running time of the first timer is described as the first running time.
  • the first running time can also be referred to as any one of the following: the first timer is the time period in the working state (on), the time period after the first timer is started, and the first timer is in the start state.
  • the time period is the time period after the first timer is restarted, or the time period during which the first timer is in the restarting state.
  • the first running time is used for the receiving end device to monitor the data transmission information of the second SCI and/or the side link. Exemplarily, ... is used for monitoring, which can be understood as being used for monitoring.
  • the data transmission information includes at least one of control information in the PSCCH, control information in the PSSCH, or data information in the PSSCH.
  • the first level of SCI is located in the PSCCH
  • the second level of SCI is located in the PSSCH.
  • the data transmission information includes control information in the PSCCH and control information in the PSSCH.
  • the data transmission information includes control information in the PSCCH, control information in the PSSCH, and data information in the PSSCH.
  • the first timer may be a DRX inactive timer.
  • the DRX inactivation timer specifies the length of time that the receiving device is in the active state or the working (on) state after successfully decoding a first SCI indicating the initial transmission.
  • the active state is a continuously active state
  • the working (on) state is a continuously working (on) state.
  • the unit of the duration is any one of time slot, mini time slot and symbol. The duration may be determined according to at least one of a time slot, a mini-slot or the number of symbols.
  • the DRX inactivation timer specifies when the receiving device successfully decodes for the first time or for the first time or newly receives a first SCI indicating retransmission, it is in the active state or in the working (on) state.
  • duration The active state is a continuously active state, and the working (on) state is a continuously working (on) state.
  • the unit of the duration is any one of time slot, mini time slot and symbol. The duration can be determined based on at least one of the time slot, mini-slot or number of symbols.
  • the first transmission is the new transmission.
  • the DRX inactive timer in this application may also be referred to as a sidelink (SL) DRX inactive timer.
  • decoding can also be called analysis, demodulation, correct reception or reception.
  • Successful decoding can also be called correct decoding or decoding.
  • the first time is the first time, or the first time for a hybrid automatic repeat request (HARQ) process.
  • HARQ hybrid automatic repeat request
  • Whether the data information is "initial transmission" is for the terminal device that starts the DRX inactivation timer.
  • the terminal device 1 sends a transport block (TB) 1 to the terminal device 2 for the first time
  • the receiving device 2 does not receive the TB1 from the terminal device 1.
  • the failure to receive the TB1 from the terminal device 1 includes: the SCI from the terminal device 1 is not correctly demodulated, or the TB1 from the terminal device 1 is not received correctly.
  • the terminal device 2 does not start the DRX inactivation timer.
  • the receiving device 2 receives the TB1 from the terminal device 1.
  • the terminal device 2 receives the TB1 for the first time, and the terminal device 2 starts the DRX inactivation timer.
  • the receiving TB1 from the terminal device 1 includes: correctly demodulating the SCI from the terminal device 1 or correctly receiving the TB1 from the terminal device 1.
  • initial transmission can also be called initial transmission.
  • a first SCI indicating the initial transmission has two meanings.
  • the second level SCI includes the new data indicator (NDI) and the HARQ process.
  • NDI new data indicator
  • the NDI indication is new data or initial transmission data
  • the receiving end device has received a first SCI indicating initial transmission.
  • the NDI indication is not new data or initial data transmission, if the receiving device receives or newly receives the data transmission information for the first time or for the first time, it is also said that the receiving device receives an indication of initial transmission The first SCI.
  • the relevant description about the start of the "first timer of the receiving end device” is as follows: in the case of initial transmission, the receiving end device starts the first timer.
  • the specific implementation process of S802 can be described in the following manner:
  • the receiving device starts the first timer.
  • the receiving device successfully decodes the first SCI, and the data transmission information indicated by the first SCI is the initially transmitted data information, then the receiving device starts the above-mentioned first timer.
  • the receiving device after the receiving device successfully decodes the first SCI indicating the initial transmission of the side uplink, the receiving device starts the above-mentioned first timer.
  • the receiving end device successfully decodes the first SCI indicating the initial transmission of the side uplink, and the data transmission indicated by the first SCI is retransmitted data information, but the receiving end device receives it for the first time, then the receiving end The device starts the aforementioned first timer.
  • the "side link initial transmission” may also be referred to as "the initial transmission of data in a hybrid automatic repeat request (HARQ) process".
  • the HARQ process can also be referred to as the HARQ process number.
  • the first or first reception of the data transmission information includes: the first or first reception of the data transmission information corresponding to the HARQ process indicated in the second-level SCI, or the first or first reception Information about data transmission to the HARQ process indicated in the second-level SCI.
  • the fifth description method if the data transmission indicated by the first SCI is a retransmission and the retransmitted data for the receiving device is a new transmission (that is, the previous transmission for the data is not detected by the receiving device), Then the receiving device starts the first timer.
  • the receiving device determines that the transmission on the side link indicated by the first SCI is a new transmission, the receiving device starts the first timer.
  • new transmission can be understood as new data transmission, or new data transmission, or data transmission for the first time.
  • transmission and data transmission are interchangeable.
  • the sixth description manner can be specifically understood as: if the receiving device determines that the data on the side link indicated by the first SCI is newly received data or data received for the first time, the receiving device starts the first timer.
  • the receiving device starts the first timer; or, if the first SCI indicates that the transmission on the side link is not a new transmission, and For the transmission on the side link of the receiving end device as a new transmission, the receiving end device starts the first timer.
  • “the first SCI indicates that the transmission of the side link is not a new transmission” may specifically be: if the data transmission indicated by the first SCI is a retransmission and for the receiving device, the retransmitted data It is new data.
  • the data transmission indicated by the first SCI is a retransmission can also be understood as “the first SCI indicates that the data transmission scheduled this time is a retransmission”, or “the first SCI indicates that this is a data retransmission”.
  • the HARQ process number may be used in combination with the NDI to indicate, or the NDI may be used to indicate directly.
  • the transmission on the side link is a new transmission is determined by the receiving device.
  • “Indicate that the transmission on the side link is a new transmission” is the information in the first SCI sent by the first originating device.
  • any one of initial transmission/initial transmission/first transmission can be replaced with new transmission (new transmission) or initial transmission (initial transmission).
  • the first SCI is the second level of the two-level SCI.
  • the second-level SCI includes an initial transmission instruction or a retransmission instruction, so the receiving device successfully decodes the first SCI indicating the initial transmission of the side link and starts the first timer.
  • the first SCI is the first level SCI and the second level SCI of the two levels of SCI.
  • the second-level SCI includes an initial transmission instruction or a retransmission instruction, and the second-level SCI relies on the decoding of the first-level SCI. Therefore, the receiving device starts the first timer after successfully decoding the first SCI indicating the initial transmission of the side link.
  • the receiving end device starts the first timer, which means: when the first SCI instruction is new data or initial transmission data, then the receiving device starts the first timer.
  • the end device receives an SCI indicating the initial transmission; or, when the first SCI instruction is to retransmit data and the receiving device receives the first SCI for the first time, the receiving device receives an SCI indicating the initial transmission.
  • the first SCI indicates to retransmit data and the receiving device receives the first SCI for the first time, it means that the receiving device receives the first SCI for scheduling the retransmitted data for the first time.
  • the receiving device Since the data transmission indicated by the first SCI is the initial transmission, or the receiving device receives the first SCI for the first time, there is a possibility of reception failure. In the case that the receiving device fails to receive the initial transmission, the first timer of the receiving device has been started. In this way, in the next period of time, the receiving device is still in the active period and can continue to receive information from the first sending device. If the first sending end device retransmits the aforementioned data transmission information or initially transmits other data transmission information, the receiving end device can still receive the aforementioned data transmission information, which improves the information transmission efficiency of data transmission and improves detection reliability.
  • the second SCI includes: the SCI indicating the initial transmission or retransmission of the data transmission of the side link in the first target period or the side link in the second target period SCI for initial transmission or retransmission of data transmission of the road.
  • the first target period is the resource reservation period for receiving the first SCI
  • the second target period is the resource reservation period after the first target period.
  • Example 1 In the first target period, the receiving device does not feed back the ACK message to the first sending device after receiving the transport block on each transmission resource, or the first sending device does not receive the feedback from the receiving device In the case of an ACK message, each transmission resource in the first target period transmits the same transmission block.
  • the second SCI received by the receiving device does not include the SCI used for the initial transmission of the data transmission of the side link.
  • Example 2 In the first target period, after receiving the transmission block on each transmission resource, the receiving device feeds back an ACK message to the first sending device.
  • the first originating device receives the ACK message fed back from the receiving device.
  • each transmission resource in the first target period can transmit different transmission blocks.
  • the second SCI received by the receiving end device includes the first SCI used for data transmission on the side link, and is different from the data transmission information indicated by the first SCI.
  • three transmission resources are reserved in one resource reservation period, which are respectively denoted as transmission resource 1, transmission resource 2, and transmission resource 3.
  • the first sending device sends TB1 to the receiving device on transmission resource 1.
  • the receiving device feeds back an ACK message to the first sending device.
  • the ACK message is used to indicate the successful reception of TB1.
  • the first sending device sends TB2 to the receiving device on the transmission resource 2 or the transmission resource 3.
  • the SCI corresponding to TB1 is the above-mentioned first SCI
  • the SCI corresponding to TB2 is the above-mentioned second SCI, which belongs to the SCI indicating the initial transmission of data transmission on the side link in the above-mentioned first target period.
  • the second SCI received by the receiving device includes the SCI indicating the initial transmission of the data transmission of the side link.
  • the second SCI also includes an SCI indicating that the data transmission on the side link is a retransmission.
  • the “SCI indicating that the data transmission of the side link is a retransmission” may be the SCI received in the first target period, or may be the SCI received in the second target period.
  • the second SCI also includes the SCI indicating that the data transmission of the side link in the first target period is retransmission, or the second SCI also includes the SCI indicating that the data transmission of the side link in the second target period is retransmission. SCI.
  • the initial transmission from the perspective of the first originating device, is the real initial transmission.
  • Retransmission is also from the perspective of the first originating device.
  • Initial transmission and retransmission have different meanings.
  • the "new transmission” needs to be explained based on the above “fifth description method”. That is, the meaning of the first SCI instruction seen by the receiving device side is the initial transmission.
  • the side-link physical layer transmits the side-link HARQ process ID, new data indicator/indication (NDI), source (source, SRC) ID, and destination (destination, DEST) ID, zone (zone) ID, HARQ enabled (enabled) state, HARQ disabled (disabled) state, reserved period (periodicity), reserved time domain resources and reserved frequency domain resources at least One is for the media access control (MAC) layer.
  • NDI new data indicator/indication
  • SRC source
  • DEST destination
  • zone zone
  • HARQ enabled (enabled) state HARQ disabled (disabled) state
  • reserved period reserved time domain resources
  • reserved frequency domain resources reserved frequency domain resources
  • the side link physical layer of the receiving end device transmits the reserved period, reserved time domain resources, side link HARQ process ID and NDI to the MAC layer.
  • the physical layer of the side link of the receiving end device transmits the reserved period, the reserved time domain resources and the side link HARQ process ID to the MAC layer.
  • the MAC entity of the MAC layer When implementing the DRX mechanism of the side link, the MAC entity of the MAC layer will monitor the PSCCH or SCI according to any timer or multiple timers of the side link. As an embodiment, the MAC entity monitors the PSCCH or the SCI according to at least one of the first timer, the second timer or the retransmission timer. As another embodiment, the MAC entity monitors the PSCCH according to at least one of the reserved period indicated by the first SCI, the reserved time domain resources, the reserved frequency domain resources, the side link HARQ process ID and the NDI.
  • the first SCI can also be understood as according to the first PSCCH.
  • Sending the first SCI can also be understood as sending the first PSCCH.
  • the first SCI can also be understood as the first PSCCH.
  • the second SCI, the third SCI, the first SCI, etc. are all applicable, so I won’t repeat them here. To understand, that is, to replace or call it.
  • the first SCI is a two-level SCI
  • the first SCI is carried on the PSCCH
  • the second-level SCI is carried on the PSSCH.
  • the first SCI is a two-level SCI
  • it can also be understood as according to the first PSCCH and the first PSSCH; sending the first SCI can also be understood as sending the first PSCCH and the first PSSCH; SCI can also be understood as the first PSCCH and the first PSSCH.
  • the second SCI, the third SCI, the first SCI, etc. are all applicable, so I won’t repeat them here.
  • the first SCI when the first SCI is a two-level SCI, according to the first SCI, it can also be understood as according to the first PSCCH and part of the first PSSCH; sending the first SCI can also be understood as sending the first SCI.
  • a PSCCH and part of the first PSSCH; the first SCI can also be understood as the first PSCCH and part of the first PSSCH.
  • the first PSSCH is the channel where sidelink data scheduled by the first-level SCI in the first PSCCH and the second-level SCI in the first PSSCH is located; part of the first PSSCH is The part of the first PSSCH used to carry the second-level SCI.
  • the receiving device determines the first running time.
  • the first running time satisfies at least one of the following:
  • the first SCI indicates the resource location of at least one transmission resource.
  • the at least one transmission resource includes a time domain resource for carrying the second SCI, and the first running time at least overlaps with the time domain resource for carrying the second SCI.
  • the manner in which the receiving device determines the first running time may be, for example, but not limited to the following manner:
  • Manner 1 The network device sends the first configuration information to the receiving device.
  • the receiving device receives the first configuration information from the network device.
  • the first configuration information indicates the running time of the first timer.
  • the first configuration newly includes multiple cells. Among them, one cell is used to indicate the running time of the first timer.
  • the first configuration information indicates that the running time of the first timer is 30 time slots. Each time the receiving device starts the first timer, the running time of the first timer is 30 slots, and it stops running after more than 30 slots.
  • the first timer runs according to the running time indicated by the first configuration information, so as to facilitate the network device to manage the operating status of the first timer of the receiving device.
  • Method 2 The receiving device determines the first running time according to the first SCI.
  • the first SCI indicates the resource location of at least one transmission resource.
  • the at least one transmission resource includes a time domain resource used to carry the second SCI.
  • the first running time at least overlaps with the time domain resources used to carry the second SCI.
  • the first 6 symbols in a transmission resource carry the second SCI.
  • the first running time at least overlaps with the first 6 symbols of each transmission resource.
  • the receiving end device when the receiving end device starts the first timer, the running time of the first timer at least overlaps with the time domain resources used to carry the second SCI, so that the first sending end device can send the receiving device to the receiving device through the reserved transmission resources.
  • the receiving device can receive the second SCI from the first originating device in time, avoiding the missed reception of the second SCI due to the fact that the receiving device is not in the activation period, thereby improving the second SCI The success rate of reception.
  • one transmission resource further includes a time domain resource used to carry information for data transmission.
  • the first running time in addition to the overlapping of the first running time with the time domain resources used to carry the second SCI, the first running time also overlaps with a part of the time domain resources used to carry the information for data transmission, or the first running time It also overlaps with all time domain resources used to carry information for data transmission.
  • Manner 3 The receiving device first uses Manner 1 to determine the running time of the first timer, and then uses Manner 2 to adjust the running time of the first timer, and uses the adjusted running time as the final first running time.
  • the receiving device first starts the first timer, and the default running time of the first timer is 30 time slots.
  • the receiving end device adjusts the running time of the first timer through the second method, and uses the adjusted running time as the final first running time.
  • the receiving device determines the first running time through the above three methods.
  • the first running time is determined by means 2 and 3
  • the first running time satisfies the following three descriptions, which are specifically as follows:
  • the first running time will be described with respect to the overlapping condition of the time domain resource carrying the second SCI and the running time of the second timer. Exemplarily, it is divided into the following two possible implementation modes for description:
  • the first running time includes at least the time domain resources carrying the second SCI in the first transmission resource in the (F-1)th resource reservation period.
  • the time domain resource carrying the second SCI in the first transmission resource in the Fth resource reservation period overlaps with the running time of the second timer, and the time domain resource in the (F-1)th resource reservation period
  • the time domain resource carrying the second SCI in the first transmission resource does not overlap with the running time of the second timer.
  • F is a positive integer, and F ⁇ 3.
  • the first resource reservation period is the resource reservation period for receiving the first SCI.
  • the time domain resource carrying the second SCI in the first transmission resource in the (F-1)th resource reservation period does not overlap with the running time of the second timer, and the Fth resource reservation period
  • the time domain resource carrying the second SCI in the first transmission resource in overlaps with the running time of the second timer. Therefore, the second timer that overlaps with the time domain resource carrying the second SCI is the second timer after the second timer where the first SCI is located.
  • the receiving moment of the first SCI corresponds to the running time of the first DRX cycle of the second timer.
  • the resource carrying the first SCI overlaps with the running time of the first DRX cycle of the second timer.
  • the first time domain resource carrying the second SCI in the Fth resource reservation period overlaps with the running time of the second DRX period of the second timer.
  • the second DRX cycle is the DRX cycle after the first DRX cycle.
  • the second DRX cycle is the first DRX cycle after the first DRX cycle, or the second DRX cycle is the second DRX cycle after the first DRX cycle, or the second DRX cycle is after the first DRX cycle
  • the Nth DRX cycle is not limited in the embodiment of this application.
  • the first time domain resource carrying the second SCI in these resource reservation periods can overlap with the running time of the second timer , It may not overlap, which is not limited in the embodiment of the present application.
  • the receiving device determines that the first running time includes at least the first time domain resource that bears the second SCI in the fifth resource reservation period.
  • the receiving device in the active period and can receive the second SCI carried in the first transmission resource, which improves the corresponding transmission resources.
  • the receiving success rate of the second SCI is in the active period and can receive the second SCI carried in the first transmission resource, which improves the corresponding transmission resources.
  • the first bearer Two resource reservation periods in which the time domain resources of the SCI and the running time of the second timer do not overlap.
  • the first time domain resource carrying the second SCI in the above three resource reservation periods does not overlap with the running time of the second timer.
  • the first running time can also be overlapped with at least one of the above three resource reservation periods.
  • the first time domain resource carrying the second SCI in the resource reservation period overlaps.
  • the receiving device in the active period, and can receive more resources carried in the first transmission resource of the resource reservation period.
  • the second SCI improves the reception success rate of the second SCI on the corresponding transmission resource.
  • the second possible implementation manner the first running time respectively overlaps with the time domain resource carrying the second SCI in the first transmission resource in the N resource reservation periods.
  • the N resource reservation periods are earlier than the F th resource reservation period, and the first time domain resource and the second timer of each resource reservation period in the N resource reservation periods carry the second SCI The running time does not overlap.
  • the first time domain resource that carries the second SCI in the F-th resource reservation period overlaps with the running time of the second timer, and the first one in the (F-1)th resource reservation period that carries the second SCI
  • the time domain resource does not overlap with the running time of the second timer.
  • the first resource reservation period is the resource reservation period for receiving the first SCI.
  • Both F and N are positive integers, and F ⁇ 3, 1 ⁇ N ⁇ (F-2).
  • the first of these resource reservation periods bears the time domain resources of the second SCI and the operation of the second timer The time does not overlap.
  • the value of N is (F-2).
  • the first part of the resource reservation period of these resource reservation periods carries the second SCI time domain resources and the second timer
  • the running time does not overlap.
  • the value of N is less than (F-2). Since the first time domain resource carrying the second SCI in the (F-1)th resource reservation period does not overlap with the running time of the second timer, the value of N is at least equal to 1.
  • the receiving device in the active period and can receive the first transmission of the above N resource reservation periods
  • the second SCI carried in the resource improves the reception success rate of the second SCI on the corresponding transmission resource.
  • the first running time is explained with respect to the way of indicating at least one transmission resource by the first SCI.
  • the description is divided into two possible implementation methods:
  • the first possible implementation manner in a case where the first SCI also indicates a resource reservation period, the at least one transmission resource indicated by the first SCI includes the first transmission resource.
  • the first running time overlaps with the time domain resource carrying the second SCI in the first transmission resource in the second target period.
  • the first target period is a resource reservation period for receiving the first SCI.
  • the second target period is the resource reservation period after the first target period.
  • the receiving device is in the active period and can receive the second SCI carried in the first transmission resource in the second target period. SCI reduces the phenomenon that the second SCI is not received in time.
  • the first transmission resource of the first target period is earlier than the transmission resource of the first SCI received. That is, the first SCI indicates the reserved first transmission resource backward (past).
  • the transmission resource of the received first SCI is a resource after the first transmission resource, or the transmission resource of the received first SCI is later than the first transmission resource in the time domain.
  • a resource reservation period includes at least one transmission resource, which are respectively denoted as transmission resource 1 and transmission resource 2.
  • transmission resource 1 is earlier than transmission resource 2.
  • the transmission resource 1 is the above-mentioned first transmission resource.
  • the first SCI is transmitted through the transmission resource 2 of the first target period. In this case, the first running time overlaps with the time domain resource carrying the second SCI in the transmission resource 1 in the second target period.
  • the receiving device can also determine that the first running time overlaps with the time domain resources carrying the second SCI, thereby improving the reception of the second SCI on the transmission resources. Success rate.
  • the first transmission resource of the first target period is the transmission resource to which the first SCI belongs. That is, the first SCI is located/carried by the first transmission resource of the first target period, and occupies a part of the symbols in the first transmission resource.
  • the at least one transmission resource indicated by the first SCI further includes a second transmission resource, and the first transmission resource and the second transmission resource are located in the same resource reservation period, and the first transmission resource is earlier than the second transmission resource. That is, the first SCI forward indicates the reserved transmission resources.
  • the first running time overlaps with the time domain resources of at least one of the following:
  • the second transmission resource in the second target period carries the time domain resource of the second SCI.
  • a resource reservation period includes at least one transmission resource, which are respectively denoted as transmission resource 1 and transmission resource 2.
  • transmission resource 1 is earlier than transmission resource 2.
  • transmission resource 1 is the foregoing first transmission resource.
  • Transmission resource 2 is the aforementioned second transmission resource.
  • the first SCI is transmitted on the transmission resource 1 of the first target period.
  • the overlap between the first running time and the reserved time domain resources is divided into the following three types:
  • the first type overlaps with the time domain resource carrying the second SCI in the transmission resource 1 in the second target period, and overlaps with the time domain resource carrying the second SCI in the transmission resource 2 in the first target period ,
  • the first running time shown in the first row in Figure 9(d).
  • the second type the first running time overlaps with the time domain resource carrying the second SCI in the transmission resource 1 in the second target period, and overlaps with the time domain resource carrying the second SCI in the transmission resource 2 in the second target period ,
  • the first running time shown in the second row in Figure 9(d).
  • the third type the first running time overlaps with the time domain resource carrying the second SCI in the transmission resource 1 in the second target period, and overlaps with the time domain resource carrying the second SCI in the transmission resource 2 in the first target period , And overlap with the time domain resource carrying the second SCI in the transmission resource 2 in the second target period, as shown in the first running time in the third row of FIG. 9(d).
  • the receiving device can also determine that the first running time overlaps with the time domain resource carrying the second SCI, thereby improving the reception of the second SCI on the transmission resource. Success rate.
  • the second possible implementation manner if at least one transmission resource includes the first transmission resource, and the first transmission resource is earlier than the transmission resource receiving the first SCI, the first running time is at least the same as the first transmission resource in the second target period
  • the time domain resources carrying the second SCI overlap.
  • the first target period is a resource reservation period for receiving the first SCI.
  • the second target period is the resource reservation period after the first target period.
  • the first transmission resource is earlier than the transmission resource of the first SCI. It can also be called that the transmission resource of the first SCI is received after the first transmission resource, or the transmission resource of the first SCI is received at time Domain later than the first transmission resource.
  • At least one transmission resource includes a first transmission resource and a second transmission resource, and the first transmission resource and the second transmission resource are located in the same resource period, the first transmission resource is earlier than the second transmission resource.
  • the transmission resource receiving the first SCI is the first transmission resource and is located in the first target period, then the first running time overlaps with at least one of the following:
  • the time domain resource carrying the second SCI in the second transmission resource in the second target period is the time domain resource carrying the second SCI in the second transmission resource in the second target period.
  • the SCI transmitted on the first transmission resource in the first target period can be the SCI that the receiving device fails to receive, or it can be the SCI that indicates aperiodic transmission.
  • the application embodiment does not limit this.
  • the continuity of the first running time is described, specifically as follows: the first running time can be continuous or discontinuous.
  • the first running time is continuous means that after the first timer is started, the first timer is always in the running state until the preset time point is reached.
  • the first running time is non-continuous means that there is a pause within a period of time.
  • the first timer has a duration of 35 time slots with two intermittent intervals of 5 time slots each time, then the actual on duration of the first timer is 25 time slots.
  • the actual running duration of the first timer (on duration) is 25 time slots, plus two intermittent times, the actual duration of time is 35 time slots.
  • the intermittent operation of the first timer may be once intermittently or intermittently for multiple times.
  • the first timer can run according to a certain period, or it can run non-periodically.
  • the first SCI also indicates the resource reservation period
  • the first threshold is less than the second threshold.
  • the first running time is continuous or may be non-continuous.
  • the first running time is non-continuous.
  • the first threshold and the second threshold may be pre-configured numerical values.
  • Example 1 Referring to Figure 10(a), taking a scenario where the resource reservation period is less than or equal to the first threshold as an example, the first resource reservation period is the resource reservation period for receiving the first SCI. From the second resource reservation period to the (F-1)th resource reservation period, the first time domain resource carrying the second SCI in each resource reservation period does not overlap with the running time of the second timer. The first time domain resource carrying the second SCI in the Fth resource reservation period overlaps with the running time of the second timer.
  • F is a positive integer
  • the first timer runs at least until the end of the first time domain resource carrying the second SCI in the (F-1)th resource reservation period, as shown in Figure 10(a ) Shown.
  • the running time of the second timer in Fig. 10(a) is described: in Fig. 10(a), the running time (on duration) of the second timer corresponding to the first resource reservation period and The running time of the second timer corresponding to the sixth resource reservation period may be the same or different. Normally, the two are the same.
  • the RRC signaling modifies the on duration in the DRX cycle (cycle), the above-mentioned difference will occur.
  • the first running time is continuous.
  • the first running time after starting the first timer, the first running time at least overlaps with the first time domain resource carrying the second SCI in (F-1) resource reservation periods.
  • the running period of the first timer is equal to the above resource reservation period, as shown in Fig. 10(b) or Fig. 10(c). In this case, the first running time is non-continuous.
  • a box represents a transmission resource. If a resource reservation period includes two transmission resources, they are recorded as transmission resource A and transmission resource B, respectively. Exemplarily, the two transmission resources in the first resource reservation period are respectively denoted as transmission resource A1 and transmission resource B1. The two transmission resources in the second resource reservation period are respectively denoted as transmission resource A2 and transmission resource B2. The two transmission resources in the third resource reservation period are respectively denoted as transmission resource A3 and transmission resource B3. The transmission resource notation in the subsequent resource reservation period, and so on.
  • the receiving device fails to receive the first SCI from the first sending device on the transmission resource A1, or the receiving device successfully receives the first SCI from the first sending device on the transmission resource A1, but the data on the transmission resource A1
  • the transmission resource indicated by the first SCI is aperiodic, as shown in the box marked "X" in Figure 10(b).
  • the receiving device successfully receives the first SCI from the first sending device on the transmission resource A2, as shown in the box marked " ⁇ ” in Figure 10(b).
  • the running period of the first timer is equal to the aforementioned resource reservation period, and each start time of the first timer is extended forward by a certain gap (Gap) time.
  • the gap time is the difference between the start time of transmission resource A and the start time of transmission resource B in the same resource reservation period, as shown in Gap1 in Figure 10(b).
  • a box represents a transmission resource.
  • the receiving device fails to receive the first SCI from the first sending device on the transmission resource A1, or the receiving device successfully receives the first SCI from the first sending device on the transmission resource A1, but the data on the transmission resource A1
  • the transmission resource indicated by the first SCI is aperiodic, as shown in the box marked "X" in Figure 10(c).
  • the receiving device successfully receives the first SCI from the first sending device on the transmission resource A2, as shown in the box marked " ⁇ " in Figure 10(c).
  • the running period of the first timer is equal to the above resource reservation period, and each start time of the first timer moves forward by a certain interval time.
  • the solid broken line in the second resource reservation period indicates the running time of the first timer after the end device is updated
  • the broken line in the second resource reservation period indicates the end device
  • the running time of the first timer before the update
  • the solid broken line in the third resource reservation period represents the running time of the first timer after the receiving device is updated
  • the broken line in the third resource reservation period represents the first timer before the receiving device is updated. operation hours.
  • Example 2 Taking a scenario where the resource reservation period is greater than or equal to the second threshold as an example, the first resource reservation period is the resource reservation period for receiving the first SCI. From the second resource reservation period to the (F-1)th resource reservation period, the first time domain resource carrying the second SCI in each resource reservation period does not overlap with the running time of the second timer. The first time domain resource carrying the second SCI in the Fth resource reservation period overlaps with the running time of the second timer.
  • F is a positive integer
  • F ⁇ 3 That is, the F-th resource period is the earliest resource period in which the time domain resource carrying the second SCI on the first transmission resource in the resource period after the first resource period overlaps with the running time of the second timer.
  • the first timer runs at least until the first time domain resource carrying the second SCI in the (F-1)th resource reservation period ends.
  • the first running time is too long, which makes the power consumption of the receiving device excessively large.
  • the first running time is usually set to be non-continuous. For example, if the first timer is started, the first running time overlaps with the first time domain resource carrying the second SCI of the F resource reservation periods.
  • the running period of the first timer is equal to the aforementioned resource reservation period.
  • the receiving device when the first running time is continuous, can be in the active period for a longer period of time to receive data from other devices (such as the first sending device, other sending devices other than the first sending device) , Network equipment, etc.) to reduce the phenomenon that SCI is not received in time.
  • the receiving end device can reduce the running time, and while improving the SCI receiving success rate, it can also save power consumption.
  • the first running time is non-continuous to reduce the running time of the first timer, save the power consumption of the receiving device, and improve the SCI reception success rate to a certain extent.
  • the specific method may be, for example, but not limited to, the following manner: if at least one time domain resource carrying the second SCI exists in the resource reservation period after the resource reservation period at the current moment For time domain resources that do not overlap with the running time of the second timer, the receiving device determines the first running time.
  • the time domain resource that "exists and does not overlap with the running time of the second timer" may be one time domain resource in a resource reservation period, or it may be multiple time domain resources in a resource reservation period .
  • the “existence of time domain resources that do not overlap with the running time of the second timer” may also refer to: time domain resources on the first k transmission resources among the K transmission resources reserved in a resource reservation period. Among them, K and k are both positive integers, and 1 ⁇ k ⁇ K.
  • the resource reservation period of "there are time domain resources that do not overlap with the running time of the second timer” may be one resource reservation period or multiple resource reservation periods.
  • the resource reservation period of "there is a time domain resource that does not overlap with the running time of the second timer” refers to the first resource reservation period after the resource reservation period at the current moment. That is, if there is a transmission resource that does not overlap with the running time of the second timer in the next resource reservation period of the resource reservation period at the current moment, the receiving device determines the first running time.
  • the resource reservation period of "there are time domain resources that do not overlap with the running time of the second timer" can also refer to the second resource reservation period after the resource reservation period at the current time, or the current time at The third resource reservation period after the resource reservation period is not limited in the embodiment of the present application.
  • the end The device determines the first running time, so that the receiving device is activated on the time domain resource of the corresponding transmission resource, can monitor the second SCI, and reduce the phenomenon that the SCI is not received in time.
  • the receiving device starts the first timer after receiving the first SCI from the first sending device. Because within the running time of the first timer (that is, the first running time), the receiving end device can monitor the data transmission information of the second SCI and/or the side link, which extends the time that the receiving end device is in the active period , In order to receive more second SCI and reduce the phenomenon that the second SCI is not received in time. Correspondingly, when the receiving end device monitors the second SCI in time, the receiving end device can also receive the data transmission information in time, reducing the data transmission delay.
  • the receiving device can also receive the third SCI from the second sending device.
  • the communication method according to the embodiment of the present application further includes the following steps:
  • the first originating device sends the first SCI to the receiving device.
  • the receiving device receives the first SCI from the first sending device.
  • the receiving device starts a first timer corresponding to the first SCI.
  • the receiving device is configured with multiple first timers. After receiving the first SCI, the receiving device starts a first timer from among the multiple first timers.
  • the first timer is the first timer corresponding to the first SCI, and is denoted as timer 1.
  • the second originating device sends a third SCI to the receiving device.
  • the receiving device receives the third SCI from the second sending device.
  • the receiving device starts the first timer corresponding to the third SCI.
  • a first timer is started from the multiple first timers, and the first timer is It is the first timer corresponding to the third SCI, denoted as timer 2.
  • Timer 1 and Timer 2 are different first timers.
  • the receiving device may execute S1101 first, and then execute S1103.
  • the receiving device can also execute S1103 first, and then execute S1101.
  • the receiving device can also execute S1101 and S1103 at the same time.
  • the embodiment of the present application does not limit the execution sequence of S1101 and S1103.
  • the receiving device starts different first timers.
  • Each first timer runs according to its own running time, so as to avoid the situation that “when a first timer is used, the running time of the first timer started later overwrites the running time of the first timer started before” .
  • the SCI received by the receiving device first indicates the periodically reserved transmission resources.
  • the running time of the first timer is the same as the periodically reserved transmission resources.
  • the time domain resources overlap.
  • the SCI received by the receiving end device indicates the non-periodically reserved transmission resources, and the running time of the first timer overlaps with the time-domain resources of the non-periodically reserved transmission resources.
  • the first timer no longer runs, and the receiving device cannot receive the SCI on the corresponding transmission resource in time.
  • the receiving end device starts different first timers for different SCIs. In this way, the running time of different first timers does not affect each other, and the running time of the first timer is not affected by each other.
  • the phenomenon of coverage enables the receiving device to receive SCI in time to improve the success rate of SCI reception.
  • the receiving device combines the running times of the first timers started by different sending devices and/or network devices to ensure that the Any one of the other originating equipment and network equipment can guarantee the success rate of reception. That is, after receiving the SCI from different originating devices, the receiving device determines the running time of the first timer corresponding to each originating device, and/or, after receiving the SCI from the network device, the receiving device determines The running time of the first timer corresponding to the network device is then combined with the determined running time of the first timer, so as to ensure that the first originating device, other originating devices and the network Any party in the device can guarantee the success rate of reception.
  • the receiving device first executes S1101, then S1103 is executed. That is, the receiving time of the first SCI is earlier than the receiving time of the third SCI.
  • the running time of the first timer corresponding to the second SCI of the second originating device is described as the third running time.
  • the third running time includes the first running time. That is, the third running time includes the running time that is not executed at the first running time.
  • the transmission resource indicated by the first SCI is resource set 1, and resource set 1 includes transmission resource A1, transmission resource A2, and transmission resource A3, as shown in the box filled with diagonal lines in FIG. 12.
  • the time domain resources of the transmission resource A1 are earlier than the time domain resources of the transmission resource A2, and the time domain resources of the transmission resource A2 are earlier than the time domain resources of the transmission resource A3.
  • the transmission resource indicated by the third SCI is resource set 2.
  • the resource set 2 includes transmission resource B1, transmission resource B2, and transmission resource B3, as shown in the blank box in FIG. 12.
  • the time domain resources of the transmission resource B1 are earlier than the time domain resources of the transmission resource B2, and the time domain resources of the transmission resource B2 are earlier than the time domain resources of the transmission resource B3.
  • the receiving device receives the first SCI from the first sending device on the transmission resource A1, and the receiving device receives the third SCI from the second sending device on the transmission resource B1.
  • the first running time is different from the time domain resources of the transmission resources in resource set 1 (such as the part of transmission resource A1).
  • the time domain resources, the time domain resources of the transmission resource A2, and the time domain resources of the transmission resource A3) overlap, as shown by the thick broken line in FIG. 12.
  • the third running time overlaps with the time domain resources of the transmission resources in the resource set 2 (such as part of the time domain resources of the transmission resource B1, the time domain resources of the transmission resource B2, and the time domain resources of the transmission resource B3), as shown in Figure 12 As shown by the thick broken line, it also overlaps with the time domain resources of the remaining transmission resources in the resource set 1, as shown by the thin broken line in FIG. 12.
  • the "remaining transmission resource” refers to the transmission resource later than the transmission resource B1. For example, if the transmission resource A2 and the transmission resource A3 are both later than the transmission resource B1, the "remaining transmission resource” includes the transmission resource A2 and the transmission resource A3.
  • the third running time also overlaps with the time domain resources of the transmission resource A2 and the time domain resources of the transmission resource A3.
  • the first timer corresponding to the first SCI and the first timer corresponding to the third SCI may be the same first timer or different The first timer.
  • the running time of the first timer started later includes the running time of the first timer started earlier. Even if part of the first timer fails, it can still ensure that the receiving device is in the time of the transmission resource indicated by the first SCI.
  • the domain resources are in the active period, and the SCI from the first originating device is received in a timely manner, which improves the success rate of receiving the SCI.
  • the receiving device determines a third running time according to the first running time and the third SCI.
  • the third SCI indicates the resource location of at least one transmission resource.
  • the transmission resource indicated by the third SCI may be periodic or aperiodic.
  • the third running time includes the first running time. For details, please refer to the above description, which will not be repeated here.
  • Step 1 The receiving device determines the second running time according to the third SCI.
  • step 1 the specific implementation process of step 1 can be referred to the related description of S803, which will not be repeated here.
  • Step 2 The receiving device uses the union of the first running time and the second running time as the third running time.
  • the receiving end device takes the union of the first running time and the second running time as the third running time” specifically includes: the receiving end device combines the non-running time in the first running time and the second running time. Set as the third running time.
  • one box represents one transmission resource. Take the periodic resources reserved by the first SCI as an example.
  • One resource reservation period includes one transmission resource.
  • the transmission resource in the first resource reservation period is recorded as transmission resource A1.
  • the transmission resource in the second resource reservation period is recorded as transmission resource A2.
  • the transmission resource in the third resource reservation period is recorded as transmission resource A3.
  • the first running time is shown by the thick solid line in Figure 13.
  • the third SCI reserves aperiodic transmission resources, such as transmission resource B1 and transmission resource B2 in FIG. 13.
  • the second running time is shown by the thin solid line in FIG. 13.
  • the third running time is the union of the first running time and the second running time, as shown in Figure 13.
  • the receiving device determines the running time of the first timer to be started later in a union manner, so that the running time of the first timer started later includes the running time of the first timer started earlier , To prevent the receiving end equipment from missing the control information and data transmission information on the reserved transmission resources.
  • first timer involved in the communication methods described in FIG. 8 to FIG. 13 all refer to: the first timer on the receiving device side.
  • second timer involved in the communication methods described in FIGS. 8 to 13 all refer to: the second timer on the receiving device side.
  • the communication method of the embodiment of the present application includes the following steps:
  • the originating device determines k first transmission resources.
  • the time domain resource carrying the first SCI among the k first transmission resources overlaps with the running time of the second timer.
  • the k first transmission resources belong to resources in the K first transmission resources.
  • the running time of the second timer belongs to the activation period of the originating device.
  • the running time of the second timer is used for the originating device to monitor the side link control information and/or data transmission information, and can also be used for the originating device to send the side link control information and/or data transmission information.
  • the running time of the second timer can be configured by the network device.
  • the running time of the second timer between different terminal devices is consistent. That is, if the second timer of the originating device is in the running state, the second timer of the receiving device is also in the running state. In this way, the time domain resource carrying the first SCI among the k first transmission resources determined by the originating device also overlaps with the running time of the second timer of the receiving device.
  • the running time of the second timer can also be configured by the originating device on the side link. For example, the group head of a group configures the same running time of the second timer for the group members.
  • the first SCI is the first SCI of the two-level SCI, or the first SCI is the second SCI of the two-level SCI, or the first SCI is the first SCI and the second SCI of the two-level SCI. Grade SCI.
  • the K first transmission resources are transmission resources reserved by the originating device.
  • the first transmission resource may be a periodic transmission resource, or may be an aperiodic transmission resource. If the first transmission resource is a periodic transmission resource, the first SCI indicates a resource reservation period, and the K first transmission resources are transmission resources in one resource reservation period.
  • K and k are positive integers, and 1 ⁇ k ⁇ K.
  • the parameter k may be a predefined parameter, or it may be configured by a network device.
  • the network device sends the second configuration information to the originating device.
  • the originating device receives the second configuration information from the network device.
  • the second configuration information indicates the value of k.
  • the second configuration newly includes multiple cells. Among them, one cell is used to indicate the value of k. In this way, the originating device can reserve the first transmission resource that overlaps the running time of the second timer according to the value of k indicated by the second configuration information.
  • the k first transmission resources may be the last k first transmission resources among the K first transmission resources. Taking one resource reservation period to reserve three transmission resources as an example, these three transmission resources are respectively denoted as transmission resource 1, transmission resource 2 and transmission resource 3.
  • the "running time of the second timer" in the first row in FIG. 15 overlaps with transmission resource 2 and transmission resource 3.
  • the k first transmission resources may be the first k first transmission resources among the K first transmission resources. That is, the time domain resources carrying the first SCI in the first k first transmission resources among the K first transmission resources overlap with the running time of the second timer. Taking one resource reservation period to reserve three transmission resources as an example, these three transmission resources are respectively denoted as transmission resource 1, transmission resource 2 and transmission resource 3. The "running time of the second timer" in the second row in FIG. 15 overlaps with transmission resource 1 and transmission resource 2.
  • the first transmission resources can all indicate the reserved transmission resources forward, that is, if the receiving device receives the first SCI transmitted on the k first transmission resources, the receiving device can according to the first SCI.
  • An SCI indicates the status of the transmission resource, determines the first transmission resource after the k first transmission resources, and then continues to receive the first SCI on the first transmission resource after the k first transmission resources to improve the utilization of transmission resources , So that the receiving device can receive more first SCI.
  • the originating device detects the signal strength of the second transmission resource.
  • the second transmission resource overlaps with the running time of the preset timer.
  • the preset timer includes at least one of the following timers:
  • the first timer exemplary, the running time of the first timer is used for the originating device to monitor side link control information and/or data transmission information, and can also be used for the originating device to send sideline link control information and/or data transmission Information.
  • the second timer is used for the originating device to monitor side link control information and/or data transmission information, and can also be used for the originating device to send sideline link control information and/or data transmission Information.
  • the retransmission timer is used by the originating device to receive control information and/or data transmission information used for retransmission of the side link.
  • the duration of the listening window is 10 ms, and in one DRX cycle, the running time of the second timer is 2 ms. If the originating device only detects transmission resources that overlap with the running time of the second timer, it needs to detect 5 DRX cycles. If the originating device detects a transmission resource that overlaps the running time of the above three timers, the DRX cycle that needs to be detected is less than 5 DRX cycles.
  • the signal strength of the second transmission resource includes reference signal receiving power (RSRP), received signal strength indicator (RSSI), and signal to interference plus noise ratio (SINR). ) At least one item.
  • RSRP is obtained by measuring the reference signal on the second transmission resource.
  • RSSI is the RSSI on the second transmission resource.
  • SINR is measured on the second transmission resource.
  • the originating device detects the signal strength of the second transmission resource in the listening window.
  • the second transmission resource may be 4 DRX cycles.
  • the originating device determines at least K first transmission resources according to the signal strength of the second transmission resource.
  • the originating device determines at least K first transmission resources according to the signal strength of the second transmission resource. For example, the originating device determines the first transmission resource by taking the 4 DRX cycles as a group in the resource selection window according to the signal strength of the aforementioned 4 DRX cycles. If the value of K is 5, the originating device has determined at least 5 first transmission resources.
  • S14012 may be specifically implemented as follows: if the second transmission resource overlaps with the preset timer for a duration that satisfies the preset duration, the originating device determines at least K first transmission resources according to the signal strength of the second transmission resource . That is, if the originating device determines that the detection duration of the second transmission resource meets the duration of the listening window, the originating device can determine the first transmission resource to be reserved in the resource selection window.
  • the originating device determines k first transmission resources from the at least K first transmission resources according to the overlapping condition of the running time of the at least K first transmission resources and the second timer.
  • the k first transmission resources are resources in the K first transmission resources.
  • the eight first transmission resources are determined as: transmission resource 1, transmission resource 2, transmission resource 3, transmission resource 4, transmission Resource 5, Transmission Resource 6, Transmission Resource 7, and Transmission Resource 8.
  • transmission resource 1 transmission resource 2
  • transmission resource 3 transmission resource 4
  • transmission Resource 5 Transmission Resource 6
  • Transmission Resource 7 Transmission Resource 8
  • transmission resource 8 transmission resource 8
  • all the eight first transmission resources do not overlap with the running time of the second timer, there is no first transmission resource that meets the requirement in the resource selection window. If at least one of the eight first transmission resources and the running time of the second timer overlap, there is a first transmission resource that meets the requirement in the resource selection window.
  • the originating device will overlap the operating time of the 8 first transmission resources and the second timer according to the above-mentioned 8 first transmission resources, Adjust the value of the parameter T 1 and/or the parameter T 2 of the resource selection window.
  • transmission resource 1 and transmission resource 2 respectively do not overlap with the running time of the second timer, and transmission resource 3 and transmission resource 4 respectively overlap with the running time of the second timer, as shown in FIG. 17.
  • the adjustment parameter T values originating device 1 so that the resource selection in the window of the first transmission resource transmission resource 3 as "adjusted resource selection window" shown in Figure 17.
  • the transmission resources of a resource selection window correspond to the transmission resources in a resource reservation period.
  • the first transmission resource can be determined.
  • m is a positive integer.
  • the originating device determines at least K first transmission resources based on the signal strength of the second transmission resource, and then combines the overlap status of the at least K first transmission resources and the running time of the second timer, from the K first transmission resources It is determined that the k first transmission resources overlap with the running time of the second timer. Because the running time of the second timer of the sending end device and the receiving end device are the same. Therefore, when the originating device sends the first SCI to the receiving device through k first transmission resources, the receiving device is also in the active period, and can receive the first SCI from the originating device, thereby improving the transmission of the first SCI. Effectiveness.
  • the originating device sends the first SCI to the receiving device on the k first transmission resources.
  • the receiving device receives the first SCI from the sending device on the k first transmission resources.
  • the running time of the k first transmission resources overlaps with the running time of the second timer.
  • the running time of the second timer of the sending device and the receiving device are the same. Therefore, when the originating device sends the first SCI, the receiving device is in the active period and can receive the first SCI, so that the receiving device can receive the first SCI in time.
  • the originating device determines that the time domain resource carrying the first SCI among the k first transmission resources overlaps with the running time of the second timer. Because the running time of the second timer of the sending device and the receiving device are the same. In this way, when the originating device sends the first SCI on the k first transmission resources, the receiving device is in the active period and can receive the first SCI, thereby making the receiving device more likely to receive the first SCI in time, and increasing the first SCI. The transmission efficiency of SCI.
  • timers involved in S1401 and S1402 all refer to the timer on the side of the originating device.
  • the first timer refers to the first timer of the originating device
  • the second timer refers to the second timer of the originating device
  • the retransmission timer refers to the retransmission timer of the originating device.
  • running time may also be understood as “running time”.
  • the receiving device, the first sending device, the second sending device, and the sending device include hardware structures and/or software modules corresponding to the respective functions.
  • the embodiments of the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software-driven hardware depends on the specific application and design constraint conditions of the technical solution. Those skilled in the art can use different methods for each specific application to implement the described functions, but such implementation should not be considered as going beyond the scope of the technical solutions of the embodiments of the present application.
  • the embodiment of the present application may divide the communication device into functional units according to the foregoing method examples.
  • each functional unit may be divided corresponding to each function, or two or more functions may be integrated into one processing unit.
  • the above-mentioned integrated unit can be implemented in the form of hardware or software functional unit. It should be noted that the division of units in the embodiments of the present application is illustrative, and is only a logical function division, and there may be other division methods in actual implementation.
  • FIG. 18 shows a schematic block diagram of a communication device provided in an embodiment of the present application.
  • the communication device 1800 may exist in the form of software, or may be a device, or a component (such as a chip system) in the device.
  • the communication device 1800 includes a processing unit 1802 and a communication unit 1803.
  • the communication unit 1803 can also be divided into a sending unit (not shown in FIG. 18) and a receiving unit (not shown in FIG. 18).
  • the sending unit is used to support the communication device 1800 to send information to other network elements.
  • the receiving unit is used to support the communication device 1800 to receive information from other network elements.
  • the processing unit 1802 may be used to support the communication device 1800 to execute S802 and S803 in FIG. 8, execute S1102, S1104, and S1105 in FIG. 11, and / Or other processes used in the scheme described herein.
  • the communication unit 1803 is used to support communication between the communication device 1800 and other network elements (for example, the first originating device, the second originating device, and the originating device).
  • the communication unit is used to support the communication device 1800 to execute S403 shown in FIG. 4, execute S801 shown in FIG. 8, execute S1103 shown in FIG. 11, execute S1402 shown in FIG. 14, and/or be used as described herein The other process of the program.
  • the communication unit 1803 is used to support communication between the communication device 1800 and other network elements (for example, receiving devices).
  • the communication unit is used to support the communication device 1800 to perform S801 shown in FIG. 8 and/or other processes used in the solution described herein.
  • the communication unit 1803 is used to support communication between the communication device 1800 and other network elements (for example, the receiving device).
  • the communication unit is used to support the communication device 1800 to perform S1103 shown in FIG. 11, and/or other processes used in the solution described herein.
  • the processing unit 1802 may be used to support the communication device 1800 to perform S1401 in FIG. 14 and perform S14011, S14012, and S11013 in FIG. 16, and/or use In the other process of the scheme described in this article.
  • the communication unit 1803 is used to support communication between the communication device 1800 and other network elements (for example, receiving equipment).
  • the communication unit is used to support the communication device 1800 to perform S1402 shown in FIG. 14 and/or other processes used in the solution described herein.
  • the communication device 1800 may further include a storage unit 1801 for storing program codes and data of the communication device 1800.
  • the data may include, but is not limited to, raw data or intermediate data.
  • the processing unit 1802 may be a processor or a controller, for example, a CPU, a general-purpose processor, a digital signal processing (digital signal processing, DSP), an application-specific integrated circuit (ASIC), which can be used on site.
  • DSP digital signal processing
  • ASIC application-specific integrated circuit
  • the processor may also be a combination of computing functions, for example, a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and so on.
  • the communication unit 1803 may be a communication interface, a transceiver or a transceiver circuit, etc., for example, the communication interface is a general term. In a specific implementation, the communication interface may include multiple interfaces, for example, may include: And/or other interfaces.
  • the storage unit 1801 may be a memory.
  • the processing unit 1802 is a processor
  • the communication unit 1803 is a communication interface
  • the storage unit 1801 is a memory
  • the communication device 1900 involved in the embodiment of the present application may be as shown in FIG. 19.
  • the communication device 1900 includes a processor 1902, a transceiver 1903, and a memory 1901.
  • the transceiver 1903 may be an independently set transmitter, which may be used to send information to other devices, and the transceiver may also be an independently set receiver, which is used to receive information from other devices.
  • the transceiver may also be a component that integrates the functions of sending and receiving information, and the embodiment of the present application does not limit the specific implementation of the transceiver.
  • the communication device 1900 may further include a bus 1904.
  • the transceiver 1903, the processor 1902, and the memory 1901 may be connected to each other through a bus 1904; the bus 1904 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture, EISA) bus, etc.
  • the bus 1904 can be divided into an address bus, a data bus, a control bus, and so on. For ease of presentation, only one thick line is used to represent in FIG. 19, but it does not mean that there is only one bus or one type of bus.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • the computer instructions may be transmitted from a website, computer, server, or data center. Transmission to another website, computer, server, or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.).
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center integrated with one or more available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a digital video disc (DVD)), or a semiconductor medium (for example, a solid state disk (SSD)) )Wait.
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are merely illustrative.
  • the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical or other forms.
  • the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple network devices (for example, Terminal equipment). Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • the functional units in the various embodiments of the present application may be integrated into one processing unit, or each functional unit may exist independently, or two or more units may be integrated into one unit.
  • the above-mentioned integrated unit may be implemented in the form of hardware, or may be implemented in the form of hardware plus software functional units.

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Abstract

本申请提供通信方法及装置，涉及通信技术领域，能够解决侧行链路控制信息无法及时接收的问题。该方法包括：收端设备接收来自第一发端设备的第一侧行链路控制信息，之后，启动第一定时器。其中，第一定时器的运行时间用于收端设备监测第二SCI和/或侧行链路的数据传输的信息。该方法应用在侧行链路通信过程中。

Description

通信方法及装置
本申请要求于2020年06月01日提交国家知识产权局、申请号为202010486439.5、发明名称为“通信方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，尤其涉及一种通信方法及装置。
背景技术
在侧行链路(sidelink，SL)通信过程中，发端设备能够自主确定空闲的传输资源，再向收端设备发送侧行链路控制信息(sidelink control information，SCI)，以预留传输资源来传输侧行链路的数据传输的信息。然而，在上述SL通信过程中，若非连续接收(discontinuous reception，DRX)持续时间定时器(on duration timer)运行，则收端设备能够监听物理侧行链路控制信道(pysical sidelink control channel，PSCCH)，以获取SCI。若DRX持续时间定时器未运行，则收端设备无法监听PSCCH，因此，收端设备无法及时接收来自发端设备的SCI。由于SCI能够指示物理侧行链路共享信道(pysical sidelink shared channel，PSSCH)的资源位置，所以，在收端设备未接收SCI的情况下，收端设备无法接收该SCI对应的数据传输的信息，进而导致数据传输时延大。
发明内容
本申请实施例提供一种通信方法及装置，能够降低数据传输时延。
为达到上述目的，本申请实施例采用如下技术方案：
第一方面，本申请提供一种通信方法，该方法可以由收端设备执行。收端设备可以为终端设备，也可以为终端设备中的组件(比如芯片系统)。该方法包括：收端设备接收来自第一发端设备的第一SCI之后，根据第一SCI，启动第一定时器。其中，第一定时器的运行时间用于收端设备监测第二SCI和/或侧行链路的数据传输的信息。
本申请实施例提供的通信方法，收端设备接收来自第一发端设备的第一SCI之后，启动第一定时器。由于第一定时器的运行时间内，收端设备能够监测第二SCI和/或侧行链路的数据传输的信息，也就延长了收端设备处于激活期的时间，以接收更多的第二SCI，减少第二SCI未及时接收的现象。相应的，在收端设备及时监测第二SCI的情况下，收端设备也就能够及时接收数据传输的信息，降低数据传输时延。
在一种可能的设计中，收端设备接收来自第一发端设备的第一SCI，包括：在第二定时器的运行时间内，收端设备接收来自第一发端设备的第一SCI。其中，第二定时器的运行时间用于收端设备监测侧行链路的控制信息和/或数据传输的信息。
这里，由于在收端设备的第二定时器的运行超时时，收端设备无法接收其他设备的信息。即使第一发端设备向收端设备发送了第一SCI，收端设备也无法接收第一SCI。在收端设备的第二定时器的运行时间内，收端设备处于激活期，能够接收其他设备的信息，也就提高了收端设备接收第一SCI的成功率。
在一种可能的设计中，收端设备根据第一SCI，启动第一定时器，包括：若第一SCI指示的数据传输为初传，则收端设备启动第一定时器。若第一SCI指示的数据传输为重传且对于所述收端设备所述重传的数据为新的传输(即之前的针对该数据的传输未被所述收端设备检测到)，则收端设备启动第一定时器。
也就是说，当第一SCI指示为新数据或初传数据时，则收端设备接收到一个指示初传的SCI；或者，当第一SCI指示为重传数据时且收端设备初次接收到第一SCI，则收端设备接收到一个指示初传的SCI。其中，当第一SCI指示为重传数据时且收端设备初次接收到第一SCI，指的是：收端设备初次接收到调度该重传数据的第一SCI。
“初传”，是针对启动该DRX非激活定时器的终端设备而言的。例如，终端设备1首次向终端设备2发送传输块(transport block，TB)1时，收端设备2未接收来自终端设备1的TB1。所述未接收来自终端设备1的TB1，包含：未正确解调来自终端设备1的SCI，或者未正确接收到来自终端设备1的TB1。终端设备2不启动该DRX非激活定时器。接下来，终端设备1再次向终端设备2发送TB1时，收端设备2接收来自终端设备1的TB1。此种情况下，终端设备2是首次接收到该TB1，终端设备2启动该DRX非激活定时器。所述接收来自终端设备1的TB1，包含：正确解调来自终端设备1的SCI，或者正确接收到来自终端设备1的TB1。另外，初传，又可以称为首次传输(initial transmission)。
示例性的，第一定时器指定了当收端设备成功解码一个指示初传的第一SCI后，持续处于激活态的时长，或者，当收端设备初次或第一次成功解码一个指示重传的第一SCI后，持续处于激活态或者工作(on)状态的时长。该时长的单位是时隙，迷你时隙和符号中的任意一项。该时长可以是根据时隙，迷你时隙或符号数中至少一项所确定的。
由于第一SCI指示的数据传输为初传，或收端设备首次接收到该指示重传的第一SCI，存在该第一SCI指示的数据传输的信息接收失败的可能性。在收端设备接收失败的情况下，由于收端设备的第一定时器已启动。如此，在接下来的一段时间内，收端设备仍处于激活期，能够继续接收第一发端设备的信息。若第一发端设备重传上述数据传输的信息或初传别的数据传输的信息，则收端设备仍能够接收上述数据传输的信息，提高数据传输的信息传输效率，提高检测可靠性。
需要说明的是，在收端设备侧，侧行链路物理层传递侧行链路HARQ进程(process)ID、新数据指示(new data indicator/indication，NDI)、源(source，SRC)ID、目的(destination，DEST)ID、区域(zone)ID、HARQ使能(enabled)状态、HARQ失效(disabled)状态、预留周期(periodicity)、预留的时域资源和预留的频域资源中至少一项给介质访问控制(media access control，MAC)层。例如，收端设备的侧行链路物理层传递预留周期、预留的时域资源、预留的频域资源、侧行链路HARQ进程ID和NDI给MAC层。再如，收端设备的侧行链路物理层传递预留周期、预留的时域资源、侧行链路HARQ进程ID和NDI给MAC层。又如，收端设备的侧行链路物理层传递预留周期、预留的时域资源和侧行链路HARQ进程ID给MAC层。
当执行侧行链路的DRX机制时，MAC层的MAC实体(entity)将根据侧行链路的任何一个定时器或多个定时器监测PSCCH或SCI。作为一种实施例，MAC实体根据第一定时器，第二定时器或重传定时器中的至少一个监测PSCCH或SCI。作为另一种实施例，MAC实体根据第一SCI所指示的预留周期、预留的时域资源、预留的频域资源，侧行链 路HARQ进程ID和NDI中的至少一个监测PSCCH。
在一种可能的设计中，收端设备根据第一SCI，启动第一定时器，包括：若收端设备确定第一SCI指示的侧行链路的传输是新的传输，则收端设备启动第一定时器。
在一种可能的设计中，收端设备根据第一SCI，启动第一定时器，包括：若第一SCI指示侧行链路的传输为新的传输，则收端设备启动第一定时器；或者，若第一SCI指示侧行链路的传输不为新的传输，且对于收端设备侧行链路的传输为新的传输，则收端设备启动第一定时器。示例性的，“第一SCI指示侧行链路的传输不为新的传输”，具体可以为：若第一SCI指示的数据传输为重传且对于收端设备来说，所述重传数据是新数据。“第一SCI指示的数据传输为重传”，也可以理解为“第一SCI指示本次调度的数据传输为重传”，或者“第一SCI指示这是一次数据重传”。示例性的，指示数据传输为重传，可以通过HARQ进程号，结合NDI进行指示，也可以通过NDI直接进行指示。
应理解，“侧行链路的传输是新的传输”是收端设备确定的。“指示侧行链路的传输为新的传输”是第一发端设备所发送的第一SCI中的信息。
在一种可能的设计中，第一SCI指示资源预留周期。
在一种可能的设计中，第二SCI至少包括：第一目标周期和/或第二目标周期中指示侧行链路的数据传输为初传的SCI。其中，第一目标周期是接收第一SCI的资源预留周期。第二目标周期是第一目标周期之后的资源预留周期。
在一种可能的设计中，本申请实施例通信方法还包括：收端设备接收来自网络设备的第一配置信息。其中，第一配置信息指示第一定时器的运行时间。
如此，在收端设备启动第一定时器的情况下，第一定时器按照第一配置信息指示的运行时间运行，以方便网络设备管理收端设备的第一定时器的运行状况。
在一种可能的设计中，本申请实施例通信方法还包括：收端设备基于第一SCI指示的至少一个传输资源确定第一定时器的运行时间。其中，基于第一SCI指示的至少一个传输资源为基于第一SCI指示的至少一个传输资源的位置，或者基于第一SCI指示的至少一个传输资源所占据的时域资源的位置。第一SCI指示至少一个传输资源的资源位置，至少一个传输资源包括用于承载第二SCI的时域资源，第一定时器的运行时间至少与用于承载第二SCI的时域资源重叠。
如此，在收端设备启动第一定时器的情况下，第一定时器的运行时间至少与用于承载第二SCI的时域资源重叠，以使得第一发端设备通过预留的传输资源向收端设备发送第二SCI时，收端设备能够及时接收来自第一发端设备的第二SCI，避免由于收端设备的未处于激活期而导致的第二SCI接收遗漏的情况，从而提高第二SCI接收的成功率。
在一种可能的设计中，第一定时器的运行时间至少包括第(F-1)个资源预留周期中的首个传输资源中承载第二SCI的时域资源。其中，第F个资源预留周期中的首个传输资源中承载第二SCI的时域资源与第二定时器的运行时间重叠，且第(F-1)个资源预留周期中的首个传输资源中承载第二SCI的时域资源与第二定时器的运行时间不重叠，第1个资源预留周期是接收第一SCI的资源预留周期，F为正整数，且F≥3。
由于第一定时器的运行时间至少包括第(F-1)个资源预留周期中的首个传输资源中承载第二SCI的时域资源，如此，在第(F-1)个资源预留周期中的首个承载第二SCI的时域资源中，收端设备仍处于激活期，能够接收首个传输资源中承载的第二SCI，提高了相 应传输资源上的第二SCI的接收成功率。
在一种可能的设计中，第F个资源预留周期中的首个或N个承载第二SCI的时域资源与第二定时器的第二非连续接收DRX周期的运行时间重叠。其中，N为正整数。第二DRX周期是第一DRX周期之后的DRX周期。第一DRX周期是第一SCI的接收时刻对应的第二定时器所在的周期。
也就是说，第F个资源预留周期与第一SCI的接收时刻分别对应第二定时器的不同DRX周期中的“持续时间(on duration)”重叠。可选的，所述N个承载第二SCI的时域资源是所述第F个资源预留周期中的前N个承载第二SCI的时域资源。
在一种可能的设计中，第一SCI指示的至少一个传输资源包括第一传输资源，第一定时器的运行时间与第二目标周期中的第一传输资源中承载第二SCI的时域资源重叠。其中，第二目标周期为第一目标周期之后的资源预留周期，第一目标周期是接收第一SCI的资源预留周期。
也就是说，在第二目标周期中的第一传输资源中承载第二SCI的时域资源上，收端设备处于激活期，能够接收上述第二目标周期的第一传输资源中承载的第二SCI，减少了第二SCI未及时接收的现象。
在一种可能的设计中，第一目标周期的第一传输资源早于接收第一SCI的传输资源，或者，第一目标周期的第一传输资源是第一SCI所属的传输资源。
如此，在第一SCI向后指示预留的传输资源的情况下，或者，在第一SCI向前指示预留的传输资源的情况下，收端设备均能够确定第一运行时间与承载第二SCI的时域资源重叠，提高上述传输资源上的第二SCI的接收成功率。
在一种可能的设计中，第一目标周期的第一传输资源是第一SCI所属的传输资源。若第一SCI指示的至少一个传输资源还包括第二传输资源，且第一传输资源和第二传输资源位于同一资源预留周期中，第一传输资源早于第二传输资源，则第一定时器的运行时间还与以下至少一项的时域资源重叠：第一目标周期中的第二传输资源中承载第二SCI的时域资源；第二目标周期中的第二传输资源中承载第二SCI的时域资源。
如此，在第一SCI向前指示预留的传输资源的情况下，收端设备也能够确定第一运行时间与承载第二SCI的时域资源重叠，提高上述传输资源上的第二SCI的接收成功率。
在一种可能的设计中，收端设备基于第一SCI指示的至少一个传输资源确定第一定时器的运行时间，包括：若在当前时刻所在资源预留周期之后的资源预留周期中，承载第二SCI的时域资源中存在未与第二定时器的运行时间重叠的时域资源，则收端设备基于第一SCI指示的至少一个传输资源确定第一定时器的运行时间；第二定时器的运行时间用于收端设备监测侧行链路的控制信息和/或数据传输的信息。
如此，若某一个资源预留周期中存在未与第二定时器的运行时间重叠的时域资源，且该资源预留周期是当前时刻所在资源预留周期之后的资源预留周期，则收端设备确定第一运行时间，以使收端设备在相应的传输资源的时域资源上是激活的，能够监测第二SCI，减少SCI未及时接收的现象。
在一种可能的设计中，第一定时器的运行时间为连续或非连续的。
如此，在第一运行时间是连续的情况下，收端设备能够在更长的时间内处于激活期，以接收来自其他设备(如第一发端设备、除第一发端设备之外的其他发端设备、网络设备 等)的信息，减少SCI未及时接收的现象。在第一运行时间是非连续的情况下，收端设备能够减少运行时间，在提高SCI接收成功率的同时，也能够节省功耗。
在一种可能的设计中，若第一SCI指示的资源预留周期小于或等于第一阈值，则第一定时器的运行时间为连续的或非连续的。若第一SCI指示的资源预留周期大于或等于第二阈值，则第一定时器的运行时间为非连续的。其中，第一阈值小于第二阈值。
在一种可能的设计中，若第一SCI指示的资源预留周期小于或等于第一阈值，则第一定时器的运行时间为连续或非连续的。若第一SCI指示的资源预留周期大于第一阈值，则第一定时器的运行时间为非连续的。
示例性的，在资源预留周期过大的情况下，第一运行时间是非连续的，以减少第一定时器的运行时间，节省收端设备的功耗，且在一定程度上提高了SCI接收成功率。
在一种可能的设计中，本申请实施例通信方法还包括：收端设备接收来自第二发端设备的第三SCI之后，启动与第三SCI对应的第一定时器。收端设备根据第一SCI，启动第一定时器，包括：收端设备启动与第一SCI对应的第一定时器。
如此，收端设备接收来自不同SCI之后，启动不同的第一定时器。各个第一定时器按照各自的运行时间运行，不同第一定时器的运行时间互不影响，也就不存在第一定时器的运行时间被覆盖的现象，使得收端设备能够及时接收SCI，以提高SCI接收成功率。
在一种可能的设计中，第三SCI的接收时刻与第一SCI的接收时刻相同，或第三SCI的接收时刻与第一SCI的接收时刻不同。
示例性的，即使收端设备同时接收第一SCI和第三SCI，由于不同的SCI对应不同的第一定时器，所以，不同的第一定时器的运行时间彼此互不影响，不存在第一定时器的运行时间被覆盖的现象，也就提高了SCI接收成功率。
在一种可能的设计中，第一SCI的接收时刻早于第三SCI的接收时刻。第一SCI对应的第一定时器的运行时间为第一运行时间，第二发端设备的第三SCI对应的第一定时器的运行时间为第三运行时间。第三运行时间包括第一运行时间。
如此，在后启动的第一定时器的运行时间包括在先启动的第一定时器的运行时间，即使部分第一定时器失效，仍能够保证收端设备在第一SCI指示的传输资源的时域资源上处于激活期，以及时接收来自第一发端设备的SCI，提高接收SCI的成功率。
在一种可能的设计中，第三SCI指示至少一个传输资源的资源位置。本申请实施例通信方法还包括：收端设备根据第一运行时间和第三SCI，确定第三运行时间。
也就是说，收端设备在确定第三运行时间时，仍结合第三SCI对传输资源的预留状况，以使得收端设备仍能够成功接收第三SCI预留的传输资源上的SCI。
在一种可能的设计中，收端设备根据第一运行时间和第三SCI，确定第三运行时间，包括：收端设备根据第三SCI，确定第二运行时间之后，将第一运行时间和第二运行时间的并集作为第三运行时间。其中，第二运行时间至少与第三SCI指示的至少一个传输资源上承载SCI的时域资源重叠。
如此，收端设备以取并集的方式，确定在后启动的第一定时器的运行时间，以使得在后启动的第一定时器的运行时间包括在前启动的第一定时器的运行时间，以避免收端设备遗漏预留的传输资源上的控制信息和数据传输的信息。
在一种可能的设计中，第一SCI为两级SCI中的第一级SCI，或第一SCI为两级SCI 中的第二级SCI，或第一SCI为两级SCI中的第一级SCI和第二级SCI。
第二方面，本申请提供一种通信方法，该方法可以由发端设备执行。发端设备可以为终端设备，也可以为终端设备中的组件(比如芯片系统)。该方法包括：发端设备确定k个第一传输资源之后，发端设备在k个第一传输资源上向收端设备发送第一SCI。其中，k个第一传输资源中承载第一SCI的时域资源与第二定时器的运行时间重叠，k为正整数，且k≥1。k个第一传输资源是发端设备预留的传输资源。第二定时器的运行时间用于发端设备监测侧行链路的控制信息和/或数据传输的信息。
本申请实施例提供的通信方法，发端设备确定k个第一传输资源中承载第一SCI的时域资源与第二定时器的运行时间重叠。由于发端设备与收端设备的第二定时器的运行时间是一致的。如此，发端设备在k个第一传输资源上发送第一SCI时，收端设备处于激活期，也就能够接收第一SCI，从而使得收端设备及时接收第一SCI的可能性，提高第一SCI的传输效率。
在一种可能的设计中，k个第一传输资源是K个第一传输资源中前k个第一传输资源。K个第一传输资源是发端设备预留的传输资源。K为正整数，且K≥k。
示例性的，由于第一传输资源均能够向前指示预留的传输资源，也就是说，若收端设备接收到k个第一传输资源上传输的第一SCI，则收端设备能够根据第一SCI对传输资源的指示状态，确定k个第一传输资源之后的第一传输资源，进而在k个第一传输资源之后的第一传输资源上继续接收第一SCI，提高传输资源的利用率，使得收端设备能够接收到更多的第一SCI。
在一种可能的设计中，k为预定义的参数。或者，本申请实施例通信方法还包括：发端设备接收来自网络设备的第二配置信息。其中，第二配置信息指示k的取值。
如此，发端设备即可按照预定义的取值或第二配置信息指示的k的取值，预留与第二定时器的运行时间重叠的第一传输资源。
在一种可能的设计中，发端设备确定k个第一传输资源，包括：发端设备检测第二传输资源的信号强度。其中，第二传输资源与预设定时器的运行时间重叠。发端设备根据第二传输资源的信号强度，确定至少K个第一传输资源。发端设备根据至少K个第一传输资源与第二定时器的运行时间重叠状况，从至少K个第一传输资源中确定k个第一传输资源。其中，预设定时器包括以下定时器中的至少一项：第一定时器，第二定时器，重传定时器。其中，第一定时器的运行时间用于发端设备监测侧行链路的控制信息和/或数据传输的信息。
也就是说，发端设备在执行侧行链路的DRX机制时，也能够预留k个第一传输资源，且与第二定时器的运行时间重叠。由于发端设备和收端设备的第二定时器的运行时间是一致的。所以，发端设备通过k个第一传输资源向收端设备发送第一SCI的情况下，收端设备也处于激活期，也就能够接收来自发端设备的第一SCI，从而提高第一SCI传输的有效性。
在一种可能的设计中，发端设备根据第二传输资源的信号强度，确定至少K个第一传输资源，包括：若第二传输资源与预设定时器的运行时间重叠时长满足预设时长，则发端设备根据第二传输资源的信号强度，确定至少K个第一传输资源。
在一种可能的设计中，第二传输资源的信号强度包括参考信号接收功率RSRP、接收信号强度指示RSSI和信干噪比SINR中的至少一项。
在一种可能的设计中，第一SCI指示资源预留周期，k个第一传输资源为一个资源预留周期中的传输资源。也就是说，发端设备在执行侧行链路的DRX机制时，也能够预留周期性的传输资源，
在一种可能的设计中，第一SCI为两级SCI中的第一级SCI，或第一SCI为两级SCI中的第二级SCI，或者第一SCI为两级SCI中的第一级SCI和第二级SCI。
第三方面，本申请提供一种通信装置，该装置可以为上述第一方面中的收端设备。该装置包括处理器、收发器和存储器。收发器用于接收来自第一发端设备的第一SCI。处理器用于根据第一SCI，启动第一定时器。其中，第一定时器的运行时间用于收端设备监测第二SCI和/或数据传输的信息侧行链路的数据传输的信息。
在一种可能的设计中，收发器具体用于：在第二定时器的运行时间内，接收来自第一发端设备的第一SCI。其中，第二定时器的运行时间用于收端设备监测侧行链路的控制信息和/或数据传输的信息。
在一种可能的设计中，处理器具体用于：若确定第一SCI指示的侧行链路的传输是新的传输，则启动第一定时器。
在一种可能的设计中，处理器具体用于：若确定第一SCI指示的侧行链路的传输是新的传输，则启动第一定时器。或者，若第一SCI指示侧行链路的传输不为新的传输，且对于收端设备侧行链路的传输为新的传输，则启动第一定时器。
在一种可能的设计中，第二SCI至少包括：第一目标周期中指示侧行链路的数据传输为初传的SCI或第二目标周期中指示侧行链路的数据传输为初传的SCI。其中，第一目标周期是接收第一SCI的资源预留周期；第二目标周期是第一目标周期之后的资源预留周期。
在一种可能的设计中，收发器用于接收来自网络设备的第一配置信息。其中，第一配置信息指示第一定时器的运行时间。
在一种可能的设计中，第一SCI指示至少一个传输资源的资源位置，第一SCI指示的至少一个传输资源包括用于承载第二SCI的时域资源，处理器还用于基于第一SCI指示的至少一个传输资源确定第一定时器的运行时间。其中，第一定时器的运行时间至少与用于承载第二SCI的时域资源重叠。
在一种可能的设计中，第一定时器的运行时间至少包括第(F-1)个资源预留周期中的首个传输资源中承载第二SCI的时域资源。其中，第F个资源预留周期中的首个传输资源中承载第二SCI的时域资源与第二定时器的运行时间重叠，且第(F-1)个资源预留周期中的首个传输资源中承载第二SCI的时域资源与第二定时器的运行时间不重叠；第1个资源预留周期是接收第一SCI的资源预留周期；F为正整数，且F≥3。
在一种可能的设计中，第F个资源预留周期中的首个或N个承载第二SCI的时域资源与第二定时器的第二DRX周期的运行时间重叠。其中，第二DRX周期是第一DRX周期之后的DRX周期；第一DRX周期是第一SCI的接收时刻对应第二定时器的周期。N为正整数。可选的，N个承载第二SCI的时域资源是第F个资源预留周期中的前N个时域资源。
在一种可能的设计中，第一定时器的运行时间与第二目标周期中的第一传输资源中承载第二SCI的时域资源重叠。其中，第二目标周期为第一目标周期之后的资源预留周期；第一目标周期是接收第一SCI的资源预留周期；第一SCI指示的至少一个传输资源包括第一传输资源。
在一种可能的设计中，第一目标周期的第一传输资源早于接收第一SCI的传输资源；或者，第一目标周期的第一传输资源是第一SCI所属的传输资源。
在一种可能的设计中，第一目标周期的第一传输资源是第一SCI所属的传输资源。若第一SCI指示的至少一个传输资源还包括第二传输资源，且第一传输资源和第二传输资源位于同一资源预留周期中，第一传输资源早于第二传输资源，则第一定时器的运行时间还与以下至少一项的时域资源重叠：第一目标周期中的第二传输资源中承载第二SCI的时域资源；第二目标周期中的第二传输资源中承载第二SCI的时域资源。
在一种可能的设计中，处理器具体用于：若在当前时刻所在资源预留周期之后的资源预留周期中，至少一个承载第二SCI的时域资源中存在未与第二定时器的运行时间重叠的时域资源，则确定第一定时器的运行时间。
在一种可能的设计中，第一定时器的运行时间为连续或非连续的。
在一种可能的设计中，若第一SCI指示的资源预留周期小于或等于第一阈值，则第一定时器的运行时间为连续的或非连续的；若第一SCI指示的资源预留周期大于或等于第二阈值，则第一定时器的运行时间为非连续的；其中，第一阈值小于第二阈值。
在一种可能的设计中，若第一SCI指示的资源预留周期小于或等于第一阈值，则第一定时器的运行时间为连续或非连续的；若第一SCI指示的资源预留周期大于第一阈值，则第一定时器的运行时间为非连续的。
在一种可能的设计中，收发器还用于接收来自第二发端设备的第三SCI。处理器还用于启动与第三SCI对应的第一定时器。处理器还用于：启动与第一SCI对应的第一定时器。
在一种可能的设计中，第三SCI的接收时刻与第一SCI的接收时刻相同，或第三SCI的接收时刻与第一SCI的接收时刻不同。
在一种可能的设计中，若第一SCI的接收时刻早于第三SCI的接收时刻，则第三运行时间包括第一运行时间；其中，第一运行时间是第一SCI对应的第一定时器的运行时间；第三运行时间是第二发端设备的第二SCI对应的第一定时器的运行时间。
在一种可能的设计中，第三SCI指示至少一个传输资源的资源位置；处理器还用于根据第一运行时间和第三SCI，确定第三运行时间。
在一种可能的设计中，处理器具体用于：根据第三SCI，确定第二运行时间。其中，第二运行时间至少与第三SCI指示的至少一个传输资源上承载SCI的时域资源重叠。处理器具体用于：将第一运行时间和第二运行时间的并集作为第三运行时间。
在一种可能的设计中，第一SCI为两级SCI中的第一级SCI；或，第一SCI为两级SCI中的第二级SCI；或，第一SCI为两级SCI中的第一级SCI和第二级SCI。
第四方面，本申请提供一种通信装置，该装置可以为上述第二方面中的发端设备。该装置包括处理器、收发器和存储器。处理器用于确定k个第一传输资源，其中，k个第一传输资源中承载第一SCI的时域资源与第二定时器的运行时间重叠；k为正整数，且k≥1；k个第一传输资源是发端设备用于预留的传输资源；第二定时器的运行时间用于发端设备用于监测侧行链路的控制信息和/或数据传输的信息。收发器用于在k个第一传输资源上向收端设备发送第一SCI。
在一种可能的设计中，k个第一传输资源是K个第一传输资源中前k个第一传输资源；K个第一传输资源是发端设备用于预留的传输资源；K为正整数，且K≥k。
在一种可能的设计中，k为预定义的参数；或者，收发器用于接收来自网络设备的第二配置信息。其中，第二配置信息指示k的取值。
在一种可能的设计中，处理器具体用于：检测第二传输资源的信号强度；其中，第二传输资源与预设定时器的运行时间重叠；根据第二传输资源的信号强度，确定至少K个第一传输资源；根据至少K个第一传输资源与第二定时器的运行时间重叠状况，从至少K个第一传输资源中确定k个第一传输资源。
在一种可能的设计中，预设定时器包括以下定时器中的至少一项：第一定时器；第二定时器；重传定时器。其中，第一定时器的运行时间用于发端设备收侧行链路的控制信息和/或数据传输的信息。
在一种可能的设计中，处理器具体用于：若第二传输资源与预设定时器的运行时间重叠时长满足预设时长，则根据第二传输资源的信号强度，确定至少K个第一传输资源。
在一种可能的设计中，第二传输资源的信号强度包括参考信号接收功率RSRP、接收信号强度指示RSSI和信干噪比SINR中的至少一项。
在一种可能的设计中，第一SCI指示资源预留周期，k个第一传输资源为一个资源预留周期中的传输资源。
在一种可能的设计中，第一SCI为两级SCI中的第一级SCI，或第一SCI为两级SCI中的第二级SCI，或者第一SCI为两级SCI中的第一级SCI和第二级SCI。
第五方面，本申请提供一种通信装置，用于实现上述第一方面中收端设备的功能。
第六方面，本申请实施例提供一种通信装置，该装置具有实现上述第一方面中任一项的通信方法的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
第七方面，提供一种通信装置，包括：处理器和存储器；该存储器用于存储计算机执行指令，当该通信装置运行时，该处理器执行该存储器存储的该计算机执行指令，以使该通信装置执行如上述第一方面中任一项的通信方法。
第八方面，本申请实施例提供一种通信装置，包括：处理器；处理器用于与存储器耦合，并读取存储器中的指令之后，根据指令执行如上述第一方面中任一项的通信方法。
第九方面，本申请提供一种通信装置，用于实现上述第二方面中收端设备的功能。
第十方面，本申请实施例提供一种通信装置，该装置具有实现上述第二方面中任一项的通信方法的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
第十一方面，本申请实施例提供一种通信装置，包括：处理器和存储器；该存储器用于存储计算机执行指令，当该通信装置运行时，该处理器执行该存储器存储的该计算机执行指令，以使该通信装置执行如上述第二方面中任一项的通信方法。
第十二方面，提供一种通信装置，包括：处理器；处理器用于与存储器耦合，并读取存储器中的指令之后，根据指令执行如上述第二方面中任一项的通信方法。
第十三方面，提供一种计算机可读存储介质，该计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机可以执行上述任一方面中任一项的通信方法。
第十四方面，提供一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机可以执行上述任一方面中任一项的通信方法。
第十五方面，提供一种电路系统，电路系统包括处理电路，处理电路被配置为执行如上述任一方面中任一项的通信方法。
第十六方面，提供一种芯片，芯片包括处理器，处理器和存储器耦合，存储器存储有程序指令，当存储器存储的程序指令被处理器执行时实现上述任一方面任意一项的通信方法。
第十七方面，提供一种通信系统，通信系统包括上述第一方面中任一方面中的收端设备和第一方面中任一方面中的第一发端设备，或包括上述第一方面中任一方面中的收端设备、第一方面中任一方面中的第一发端设备和第一方面中任一方面中的第二发端设备，或包括上述第二方面中任一方面中的收端设备和第二方面中任一方面中的发端设备。
其中，第二方面至第十七方面中任一种设计方式所带来的技术效果可参见第一方面中不同设计方式所带来的技术效果，此处不再赘述。
附图说明
图1为本申请实施例提供的一种非连续接收周期的示意图；
图2为本申请实施例提供的另一种非连续接收周期的示意图；
图3为本申请实施例提供的一种预留传输资源的过程示意图；
图4为本申请实施例提供的一种传输资源的分布示意图；
图5为本申请实施例提供的又一种传输资源分布示意图；
图6为本申请实施例提供的一种通信系统的架构示意图；
图7为本申请实施例提供的再一种通信系统的架构示意图；
图8为本申请实施例提供的一种通信方法的流程示意图；
图9(a)为本申请实施例提供的一种第一定时器的运行状况的示意图；
图9(b)为本申请实施例提供的再一种第一定时器的运行状况的示意图；
图9(c)为本申请实施例提供的又一种第一定时器的运行状况的示意图；
图9(d)为本申请实施例提供的又一种第一定时器的运行状况的示意图；
图10(a)为本申请实施例提供的又一种第一定时器的运行状况的示意图；
图10(b)为本申请实施例提供的又一种第一定时器的运行状况的示意图；
图10(c)为本申请实施例提供的又一种第一定时器的运行状况的示意图；
图11为本申请实施例提供的又一种通信方法的流程示意图；
图12为本申请实施例提供的又一种第一定时器的运行状况的示意图；
图13为本申请实施例提供的又一种第一定时器的运行状况的示意图；
图14为本申请实施例提供的又一种通信方法的流程示意图；
图15为本申请实施例提供的一种第二定时器的运行状况的示意图；
图16为本申请实施例提供的又一种通信方法的流程示意图；
图17为本申请实施例提供的一种资源预留的位置示意图；
图18为本申请实施例提供的一种通信装置的结构示意图；
图19为本申请实施例提供的再一种通信装置的结构示意图。
具体实施方式
本申请的说明书以及附图中的术语“第一”和“第二”等是用于区别不同的对象，或者用于区别对同一对象的不同处理，而不是用于描述对象的特定顺序。此外，本申请的描述中 所提到的术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。例如包含了一系列步骤或单元的过程、方法、系统、产品或设备没有限定于已列出的步骤或单元，而是可选地还包括其他没有列出的步骤或单元，或可选地还包括对于这些过程、方法、产品或设备固有的其它步骤或单元。本申请实施例中，“多个”包括两个或两个以上。本申请实施例中，“示例性的”或者“例如”等词用于表示作例子、例证或说明。本申请实施例中被描述为“示例性的”或者“例如”的任何实施例或设计方案不应被解释为比其它实施例或设计方案更优选或更具优势。确切而言，使用“示例性的”或者“例如”等词旨在以具体方式呈现相关概念。
首先，介绍本申请中所涉及的技术术语和处理过程：
1、DRX机制
为了节省终端设备的功耗，网络设备可以向终端设备配置DRX机制。DRX机制可以分为两种：空闲态(idle)的DRX和连接态的非连续接收(connected mode discontinuous reception，C-DRX)，这两种实现机制有所不同。其中，在空闲态的DRX下，终端设备主要监听网络设备的寻呼，终端设备在一个DRX周期(DRX cycle)监听一次寻呼时机(paging occasion)。
在连接态的非连续接收机制下，参见图1，终端设备可以周期性的进入休眠状态，不需要监听物理下行控制信道(physical downlink control channel，PDCCH)，以节省功耗。一个DRX周期至少包括一个DRX持续时间定时器(DRX-on duration timer)的时间和可能的一段休眠(opportunity for DRX)的时间。其中，一个DRX持续时间定时器的时间又称为“持续时间(on duration)”，一段休眠的时间又称为“休眠期”，是指DRX周期中的非激活时间(non-active time)，终端设备无需监听PDCCH。
参见图1，DRX周期的周期类型可以有两种，即长DRX周期(long DRX cycle，LDC)和短DRX周期(short DRX cycle，SDC)。网络设备为终端设备配置DRX参数时，需要配置长DRX周期的参数，可选的，还可以配置短DRX周期的参数。在DRX机制中，终端设备均需要配置长DRX周期的参数，不同终端设备的长DRX周期的周期长度可以相同，也可以不同。在DRX机制中，短DRX周期是系统可选的配置，即每个终端设备均配置长DRX周期之外，还可以配置短DRX周期。对于同一终端设备而言，长DRX周期的周期长度是短DRX周期的周期长度的整数倍，且长DRX周期的持续时间与短DRX周期的部分持续时间是重叠的，如图1所示。在图1中，一个长DRX周期的时长包括两个短DRX周期的时长，一个长DRX周期的持续时间与一个短DRX周期的时长相同且重叠。
由图1可知，休眠期的时间越长，终端设备的功耗就越低。但相应的，数据传输的时延增加。因此，DRX周期的选择要考虑节电与时延的平衡。
通常，当终端设备在某个子帧被调度并接收或发送数据信息后，很可能在接下来的几个子帧内继续被调度，如果要等到下一个DRX周期再来接收或发送这些数据信息，将带来额外的延迟。为了降低上述延迟，终端设备在被调度后，持续位于激活期，即在配置的激活期内持续监听PDCCH。其实现机制是：每当终端设备被调度以初传数据时，就会启动(或重启)一个DRX非激活定时器(inactivity timer)，终端设备将一直处于激活态直到该DRX非激活定时器超时。DRX非激活定时器指定了当终端设备成功解码一个指示初传的PDCCH后，持续处于激活态的连续子帧数。即每当终端设备有初传的数据被调度，该 DRX非激活定时器就重启一次。
需要说明的是，激活期包括DRX持续时间定时器的运行时间和DRX非激活定时器的运行时间。
DRX非激活定时器的作用是为了降低数据信息的处理时延。但是，若该DRX非激活定时器的时长设置的过长，当网络设备的数据信息发送结束之后，该DRX非激活定时器还没有超时，则终端设备仍继续监听PDCCH，无法及时地进入休眠状态。为了尽量快速的让终端设备进入休眠状态，系统引入了一个预定的媒体接入控制(media access control，MAC)控制元素(control element，CE)，即DRX命令MAC控制元素(DRX command MAC CE)，又称为休眠控制元素(go-to-sleep CE)。若网络设备检测到无上行的数据信息和下行的数据信息传输，则网络设备向该终端设备发送一个MAC协议数据单元(protocol data unit,PDU)。相应的，该终端设接收来自网络设备的MAC PDU。其中，该MAC PDU中包括上述DRX命令MAC控制元素。终端设备根据DRX命令MAC控制元素，进入休眠状态。
参见图2，终端设备按照配置的DRX周期的参数，周期性地启动DRX持续时间定时器。DRX持续时间定时器的运行时间如图2中的细实线所示。在DRX持续时间定时器的运行时间内，终端设备能够接收来自网络设备的PDCCH。其中，终端设备能够检测或接收PDCCH的时间如图2中的粗实线所示。在DRX持续时间定时器的运行时间内，网络设备向终端设备发送PDCCH。相应的，终端设备接收来自网络设备的PDCCH。终端设备启动DRX非激活定时器。DRX非激活定时器的运行时间如图2中的虚线所示。在DRX非激活定时器的运行时间内，网络设备向终端设备发送DRX命令MAC控制元素。相应的，终端设备接收来自网络设备的DRX命令MAC控制元素。此时，终端设备的DRX持续时间定时器和DRX非激活定时器均处于运行状况。终端设备根据DRX命令MAC控制元素，使DRX持续时间定时器和DRX非激活定时器停止运行，终端设备不再接收PDCCH，如图2中的粗实线所示。终端设备进入休眠状态。
网络设备通过RRC信令向终端设备配置DRX参数，如DRX周期(DRX cycle)、DRX持续时间定时器(drx-on duration timer)、DRX非激活定时器、DRX混合自动重传请求往返时间定时器(drx-hybrid auto repeat request round trip timer，drx-HARQ-RTT-Timer)、DRX重传定时器(drx-retransmission timer)等定时器参数。其中，终端设备在DRX持续时间定时器、DRX非激活定时器、下行链路(downlink，DL)的DRX重传定时器和上行链路(uplink，UL)的DRX重传定时器启动期间均需要监听PDCCH，这些时间也统称为激活时间(active time)。在非激活时间，终端设备可以进入休眠状态，无需监听PDCCH。
其中，DRX持续时间定时器：指示终端设备在DRX周期开始时连续监听PDCCH的时长。示例性的，时长可以是指子帧数量。
DRX非激活定时器：当终端设备检测到PDCCH用于调度上行链路或下行链路初传数据时，启动(或重启)该定时器并保持持续监听PDCCH的时长。
DRX混合自动重传请求往返时间定时器：包括上行的drx-HARQ-RTT-Timer和下行的drx-HARQ-RTT-Timer，下行的drx-HARQ-RTT-Timer指示终端设备期望收到下行重传分配(assignment)之前的最小时长，上行的drx-HARQ-RTT-Timer指示终端设备期望收到上行重传授权之前的最小时长。
DRX重传定时器(drx-retransmission timer)：包括UL的DRX重传定时器和DL的DRX重传定时器，DL的DRX重传定时器用于规定终端设备期望获取下行重传的最大时长，UL的DRX重传定时器用于规定终端设备期望获取上行重传授权的最大时长。
另外，DRX参数还包括DRX起始偏移(DRX start offset)和长DRX周期的子帧数量。其中，DRX起始偏移是指DRX周期的起始子帧。长DRX周期的子帧数量是指一个长DRX周期占用的子帧数量。上述两个参数均是由长DRX周期起始偏移量(longDRX-cycle start offset)字段确定的。
2、侧行链路(sidelink，SL)的资源选择
目前，在SL通信过程中，通过物理层侧行链路共享信道(physical sidelink shared channel，PSSCH)来传输数据信息，通过物理层侧行链路控制信道(physical sidelink control channel，PSCCH)来承载控制信息，如SCI。SL通信过程有两种传输模式，即传输模式(mode)1和传输模式2。另外，传输模式1也简称为模式1，传输模式2也简称为模式2。
在传输模式1中，终端设备的传输资源是由网络设备分配的，终端设备在网络设备分配的传输资源上传输信息。网络设备为终端设备分配单次的传输资源，也可以为终端设备分配周期性的传输资源。
在传输模式2中，终端设备采用侦听(sensing)+预留(reservation)的方式确定传输资源。参见图3，终端设备1的具体处理过程包括：
步骤一、终端设备1获取待发送的数据信息。
示例性的，参见图3，终端设备1在时刻n或时刻n附近有新的数据信息到达，需要向其他终端设备1发送数据信息。
步骤二、终端设备1确定侦听窗(sensing window)。
示例性的，由于终端设备1要发送数据信息，所以，终端设备1进行资源选取或者资源重选。侦听窗即为n时刻之前的预设时长，如1000ms。示例性的，参见图3，侦听窗的起始时刻记为：n-T 0，侦听窗的结束时刻记为：n-T proc，0。
其中，终端设备1可以先执行步骤一，再执行步骤二，也可以先执行步骤二，再执行步骤一，还可以同时执行步骤一和步骤二，本申请实施例对步骤一和步骤二的执行顺序不作限定。
步骤三、终端设备1确定资源选择窗(resource selection window)。
其中，资源选择窗即为n时刻之后的预设时长。示例性的，参见图3，资源选择窗的起始时刻记为：n+T 1，资源选择窗的结束时刻记为：n+T 2。其中，T 1≤4ms，40ms≤T 2≤100ms。
步骤四、终端设备1根据侦听窗的侦听结果，在资源选择窗中选择传输资源，以传输数据信息。
其中，侦听结果包括物理侧行链路控制信道(physical sidelink control channel，PSCCH)的检测结果和该PSCCH所对应的物理侧行共享信道(physical sidelink shared channel，PSSCH)的参考信号接收功率(reference signal received power，RSRP)的测量值。
其中，预留的传输资源可以是周期性的，也可以是非周期性的。若预留的传输资源是周期性的，则一个资源预留周期中最多预留N max个传输资源。不同资源预留周期中的传输资源可以传输同一TB块，也可以传输不同TB块。同一资源预留周期中的传输资源传输同一TB块。另外，同一资源预留周期中的传输资源也可以传输不同的TB块。例如，一 个资源预留周期中包括三个传输资源，可以分别记为传输资源1、传输资源2和传输资源3。收端设备在传输资源1上成功接收TB1。此种情况下，收端设备向发端设备反馈确认(acknowledgement，ACK)消息。为了提高传输资源利用率，传输资源2或传输资源3上无需继续传输TB1，可以传输其他的传输块，如TB2。
示例性的，参见图3，以图3为例，对步骤三的一种可能的具体实现过程进行说明：在未执行步骤三之前，将资源选择窗内的所有资源组成候选资源集合S_A，且该候选资源集合S_A中的资源数量为A。
若侦听结果中的PSSCH的RSRP的测量值高于PSSCH-RSRP阈值，且该PSSCH对应的PSCCH指示了发送该PSCCH的终端设备2预留了后续传输所需的时频资源(例如图3中，发送该PSCCH的终端设备2预留的时频资源为，与侦听窗内资源A相对应的位于资源A之后100ms、200ms、300ms、……等时域位置的时频资源A1)，则终端设备1将终端设备2预留的传输资源排除在候选资源集合S_A之外。此时，记该候选资源集合S_A中剩余的资源数量等于B。终端设备再从候选资源集合S_A中剩余的B个资源中确定用于传输数据信息的传输资源。
示例性的，参见图4，通过上述四个步骤，终端设备1预留的传输资源如图4中的方框所示。传输资源的资源预留周期为T。一个资源预留周期中包括三个传输资源，即N max＝3。细实线方框表示用于传输TB1的传输资源，粗实线方框表示用于传输TB2的传输资源，即图4所示的场景中，不同资源预留周期传输不同的TB。
步骤五、终端设备1在选择的传输资源上发送传输块。
其中，一个传输块包括SCI和数据信息，或者，一个传输块为SCI所调度的PSSCH。SCI包括数据传输进程号和资源预留信息。其中，数据传输进程号对应传输数据信息的进程，以使收端设备接收数据信息。资源预留信息包括预留的传输资源的个数N max。可选的，若终端设备1预留的传输资源为周期性的，则资源预留信息还包括资源预留周期。此种情况下，N max表示一个资源预留周期中预留的传输资源的个数。
示例性的，仍以预留的传输资源为周期性的传输资源为例，参见图5，图5所示的场景中，一个资源预留周期中预留三个传输资源。图5中的粗实线方框表示的区域指示承载SCI的传输资源，图5中的细实线方框表示的区域指示承载数据信息的传输资源。图5中的带箭头的虚线表示SCI中包括用于接收数据信息的数据传输进程号。图5中的带箭头的实线表示SCI中包括资源预留信息。
参见图5，SCI能够向前(forward)指示预留的传输资源。以向右指示的箭头为例，在同一个资源预留周期中，对于图5中的第一个传输资源而言，从第一个传输资源指向第二个传输资源的实线表示：第一个传输资源中的SCI用于指示预留的第二个传输资源的资源位置。从第一个传输资源指向第三个传输资源的实线表示：第一个传输资源中的SCI用于指示预留的第三个传输资源的资源位置。对于图5中的第二个传输资源而言，从第二个传输资源指向第三个传输资源的实线表示：第二个传输资源中的SCI用于指示预留的第三个传输资源的资源位置。
参见图5，可选的，SCI还能够向后(past/backward)指示预留的传输资源。以向左指示的箭头为例，在同一个资源预留周期中，对于图5中的第三个传输资源而言，从第三个传输资源指向第二个传输资源的实线表示：第三个传输资源中的SCI用于指示预留的第二 个传输资源的资源位置。从第三个传输资源指向第一个传输资源的实线表示：第三个传输资源中的SCI用于指示预留的第一个传输资源的资源位置。对于图5中的第二个传输资源而言，从第二个传输资源指向第一个传输资源的实线表示：第二个传输资源中的SCI用于指示预留的第一个传输资源的资源位置。
可选的，SCI还能够既向前指示，又向后指示。可选的，向前指示的传输资源个数可以是网络设备配置的或者预定义的第一取值，和/或，向后指示的传输资源个数可以是网络设备配置的或者预定义的第二取值。其中，第一取值与第二取值可以为相同的值，或者不同的值。作为一个示例，向前指示的传输资源为一个，向后指示的传输资源为一个。
可选的，当SCI位于最后一个预留的传输资源时，可以只向后指示预留的传输资源。
另外，SCI中还能够指示承载该SCI的传输资源是预留的传输资源中的第几个传输资源。示例性的，N P表示在同一个资源预留周期中承载该SCI的传输资源之前的传输资源数量。N F表示在同一个资源预留周期中承载该SCI的传输资源之后的传输资源数量。仍以图5所示的场景为例，对于第一个传输资源而言，N P＝0，N F＝2。对于第二个传输资源而言，N P＝1，N F＝1。对于第三个传输资源而言，N P＝2，N F＝0。
需要说明的是，在本申请实施例中，第一定时器可以具体实施为DRX非激活定时器，第二定时器可以具体实施为DRX持续时间定时器。传输资源包括时域资源和频域资源，或者，传输资源特指时域资源。传输资源也简称资源。“数据信息”与“数据”指代同一含义，可以互相替换。“传输块”与“数据包”指代同一含义，可以互相替换。在本申请实施例中，A与B“重叠”是指：A和B在时域上占据的资源有相同的部分。具体来说，可以是：A包括B，B包括A，或者A和B没有包括关系，但是在时域上占据的资源完全相同或者重叠。以时域资源为例，即A的时域资源至少包括B的时域资源。本申请中，接收SCI，包含：检测SCI，和/或解码(或解调，或解析)SCI。本申请中，接收的含义为接收到，未接收的含义为未接收到。可选的，接收，可以理解为正确接收到。本申请中监测可以与检测互相替换。本申请中，预配置可以是通过来自网络设备的无线资源控制(radio resource control，RRC)信令预配置，或者PC5RRC信令预配置,或者预定义。本申请中，…用于…监测,可以理解为…被用于监测…。新的传输，可以理解为新的数据传输，或新的数据的传输，或数据的首次传输。本申请中，传输与数据传输可替换。…指示…,或者，任何一个配置指示…,其含义为：任何一个配置可以包含多个信元。其中，一个信元用于指示…。
在SL通信过程中，若DRX持续时间定时器运行，则收端设备能够监听PSCCH，以获取SCI。若DRX持续时间定时器未运行，则收端设备无法监听PSCCH，因此，收端设备无法及时接收来自发端设备的SCI。由于SCI能够指示物理侧行链路共享信道(pysical sidelink shared channel，PSSCH)的资源位置，所以，在收端设备未接收SCI的情况下，收端设备也就无法接收该SCI对应的数据传输的信息，进而导致数据传输时延大。可选的，收端设备在激活期内都能够监听PSCCH，以获取SCI。
有鉴于此，本申请实施例提供一种通信方法，本申请实施例通信方法可以适用于终端设备之间通信的系统，如V2X通信系统、设备到设备(device to device，D2D)系统。参见图6，该通信系统包括至少两个终端设备60，两个终端设备60之间能够通过侧行链路直接进行通信。可选的，参见图7，该通信系统还包括网络设备70。终端设备60还可以与网络设备70进行通信(图6和图7中仅示出了两个终端设备60)。
其中，终端设备60主要用于接收或者发送数据。可选的，本申请实施例中所涉及到的终端设备60可以是实现终端设备60功能的设备或设备中的组件，比如，终端设备60包括例如但不限于各种具有无线通信功能的手持设备、车载设备、可穿戴设备、计算设备或连接到无线调制解调器的其它处理设备；还可以包括用户单元(subscriber unit)、蜂窝电话(cellular phone)、智能电话(smart phone)、无线数据卡、个人数字助理(personal digital assistant，PDA)电脑、平板型电脑、手持设备(handheld)、膝上型电脑(laptop computer)、机器类型通信(machine type communication,MTC)终端(terminal)、用户设备(user equipment，UE)、移动终端等。又比如，终端设备60可以是上述任一设备中的组件(比如，终端设备60可以指上述任一设备中的芯片系统)。本申请实施例中所涉及到的终端设备60还可以是作为一个或多个部件或者单元而内置于车辆的车载模块、车载模组、车载部件、车载芯片或者车载单元，车辆通过内置的所述车载模块、车载模组、车载部件、车载芯片或者车载单元可以实施本申请的方法。在本申请一些实施例中，终端设备还可以称为终端，在此统一说明，下文不再赘述。
网络设备70是一种部署在无线接入网用以提供无线通信功能的装置。可选的，网络设备70可以指接入网的空中接口上通过一个或多个小区与无线终端设备60通信的设备，其中，实现网络设备70的功能的装置可以是网络设备70，也可以是支持网络设备70实现该功能的装置(比如网络设备70中的芯片)。可选的，网络设备70可对空中接口进行属性管理。基站设备还可协调对空中接口的属性管理。网络设备70包括各种形式的宏基站，微基站(也称为小站)，诸如中继站的中继设备或中继设备的芯片，发送接收点(transmission reception point，TRP)，演进型网络节点(evolved Node B，eNB)，下一代网络节点(g Node B，gNB)、连接下一代核心网的演进型节点B(ng evolved Node B，ng-eNB)等。或者，在分布式基站场景下，网络设备70可以是基带单元(base band unit，BBU)和射频拉远单元(remote radio unit，RRU)，在云无线接入网(cloud radio access Netowrk，CRAN)场景下，网络设备70可以是基带池(BBU pool)和RRU。
图6和图7所示的通信系统可以应用于目前的长期演进(long term evolution，LTE)或者高级的长期演进(LTE advanced，LTE-A)系统中，也可以应用于目前正在制定的5G网络或者未来的其它网络中，当然，还可以应用于LTE和5G混合组网的系统中，或者其他系统中，本申请实施例对此不作具体限定。其中，在不同的网络中，上述通信系统中的网络设备70、终端设备60可能对应不同的名字，本领域技术人员可以理解的是，名字对设备本身不构成限定。
本申请实施例描述的通信系统以及业务场景是为了更加清楚的说明本申请实施例的技术方案，并不构成对于本申请实施例提供的技术方案的限定。本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本申请实施例提供的技术方案对于类似的技术问题，同样适用。
下面对本申请实施例提供的通信方法进行示例性阐述。
需要说明的是，本申请下述实施例中各个网元之间的消息名字或消息中各参数的名字等只是一个示例，具体实现中也可以是其他的名字，在此统一说明，以下不再赘述。
本申请实施例提供一种通信方法，该通信方法应用在侧行链路的数据传输过程中。参见图8，该通信方法包括如下步骤：
S801、第一发端设备向收端设备发送第一SCI。相应的，收端设备接收来自第一发端设备的第一SCI。
其中，收端设备处于激活期，才能够监测侧行链路的控制信息和数据传输的信息中的至少一项。
其中，第一SCI为两级SCI中的第一级SCI，或第一SCI为两级SCI中的第二级SCI，或第一SCI为两级SCI中的第一级SCI和第二级SCI。
作为一种可能的实现方式，对于收端设备而言，S801可以具体实现为包括：在收端设备的第二定时器的运行时间内，收端设备接收来自第一发端设备的第一SCI。
示例性的，收端设备的第二定时器的运行时间用于收端设备监测侧行链路的控制信息和数据传输的信息中的至少一项。示例性的，…用于…监测,可以理解为…被用于监测…。例如，第二定时器的运行时间用于收端设备监测侧行链路的控制信息和数据信息，可以理解为，第二定时器的运行时间被用于端设备监测侧行链路的控制信息和数据信息。
示例性的，第二定时器可以是DRX持续时间定时器，或能够实现DRX持续时间定时器的功能的其它定时器，本申请实施例对此不作限定。
由于在收端设备的第二定时器的运行超时时，收端设备无法接收其他设备(如第一发端设备、除第一发端设备之外的其他发端设备和网络设备)的信息。即使第一发端设备向收端设备发送了第一SCI，收端设备也无法接收第一SCI。在收端设备的第二定时器的运行时间内，收端设备处于激活期，能够接收其他设备的信息，也就提高了收端设备接收第一SCI的成功率。
S802、收端设备根据第一SCI，启动第一定时器。
其中，第一定时器的运行时间描述为第一运行时间。第一运行时间，也可以称之为如下中的任何一项：第一定时器为工作状态(on)的时间段，第一定时器被启动后的时间段，第一定时器处于启动状态的时间段，第一定时器被重启后的时间段，或第一定时器处于重启状态的时间段。第一运行时间用于收端设备监测第二SCI和/或侧行链路的数据传输的信息。示例性的，…用于…监测,可以理解为…被用于监测…。例如，第一定时器的运行时间用于收端设备监测第二SCI，可以理解为，第一定时器的运行时间被用于端设备监测第二SCI。数据传输的信息包含PSCCH中的控制信息，PSSCH中的控制信息或PSSCH中的数据信息中至少一项。通常，第一级SCI位于PSCCH中，第二级SCI位于PSSCH中。可选的，数据传输的信息包含PSCCH中的控制信息和PSSCH中的控制信息。可选的，数据传输的信息包含PSCCH中的控制信息，PSSCH中的控制信息和PSSCH中的数据信息。
可选的，第一定时器可以为DRX非激活定时器。
可选的，本申请中，DRX非激活定时器指定了当收端设备成功解码一个指示初传的第一SCI后，处于激活态或者工作(on)状态的时长。所述处于激活态为持续处于激活态，所述工作(on)状态为持续处于工作(on)状态。该时长的单位是时隙，迷你时隙和符号中的任意一项。该时长可以是根据时隙，迷你时隙或符号数中至少一项所确定的。
可选的，本申请中，DRX非激活定时器指定了当收端设备初次或第一次成功解码或新接收到一个指示重传的第一SCI后，处于激活态或者工作(on)状态的时长。所述处于激活态为持续处于激活态，所述工作(on)状态为持续处于工作(on)状态。该时长的单位是时隙，迷你时隙和符号中的任意一项。该时长可以是根据时隙，迷你时隙或符号数中至 少一项所确定的。
本申请中，初传即新的传输。本申请中的DRX非激活定时器也可以称之为侧行链路(sidelink，SL)DRX非激活定时器。
本申请中，解码也可以称之为解析，解调，正确接收或接收到。成功解码也可以称之为正确解码或解码。初次，即为第一次，或者，针对某混合式自动重送请求(hybrid automatic repeat request，HARQ)进程的第一次。
数据信息是否为“初传”，是针对启动该DRX非激活定时器的终端设备而言的。例如，终端设备1首次向终端设备2发送传输块(transport block，TB)1时，收端设备2未接收来自终端设备1的TB1。所述未接收来自终端设备1的TB1，包含：未正确解调来自终端设备1的SCI，或者未正确接收到来自终端设备1的TB1。终端设备2不启动该DRX非激活定时器。接下来，终端设备1再次向终端设备2发送TB1时，收端设备2接收来自终端设备1的TB1。此种情况下，终端设备2是首次接收到该TB1，终端设备2启动该DRX非激活定时器。所述接收来自终端设备1的TB1，包含：正确解调来自终端设备1的SCI，或者正确接收到来自终端设备1的TB1。另外，初传，又可以称为首次传输(initial transmission)。
可选的，一个指示初传的第一SCI包含两层含义。第一SCI包括第二级SCI的情况下，第二级SCI包含新数据指示(new data indicator，NDI)和HARQ进程。当NDI指示为新数据或初传数据时，则称收端设备接收到一个指示初传的第一SCI。或者，当NDI指示不为新数据或不为初传数据时，如果收端设备初次或第一次接收到或新接收到该数据传输的信息，则也称收端设备接收到一个指示初传的第一SCI。
其中，关于“收端设备的第一定时器”的启动的相关说明如下：在初传的情况下，收端设备启动第一定时器。示例性的，S802的具体实现过程可以采用如下方式描述：
第一种描述方式、若第一SCI指示的数据传输为初传，则收端设备启动第一定时器。
第二种描述方式、收端设备成功解码第一SCI，且第一SCI指示的数据传输的信息为初始传输的数据信息，则收端设备启动上述第一定时器。
第三种描述方式、收端设备成功解码指示侧行链路初始传输的第一SCI之后，则收端设备启动上述第一定时器。
第四种描述方式、收端设备成功解码指示侧行链路初始传输的第一SCI，且第一SCI指示的数据传输为重传的数据信息，但收端设备为初次接收到，则收端设备启动上述第一定时器。
其中，“侧行链路初始传输”也可以称之为“混合自动重传请求(hybrid automatic repeat request，HARQ)进程的数据的初始传输”。HARQ进程，也可以称之为HARQ进程号。可选的，初次或第一次接收到该数据传输的信息包含：初次或第一次接收到对应第二级SCI中所指示的HARQ进程的数据传输的信息，或者，初次或第一次接收到第二级SCI中所指示的HARQ进程的数据传输的信息。
第五种描述方式、若第一SCI指示的数据传输为重传且对于收端设备所述重传的数据为新的传输(即之前的针对该数据的传输未被收端设备检测到)，则收端设备启动第一定时器。
第六种描述方式、若收端设备确定第一SCI指示的侧行链路的传输是新的传输，则收 端设备启动第一定时器。
示例性的，新的传输，可以理解为新的数据传输，或新的数据的传输，或数据的首次传输。本申请中，传输与数据传输可替换。第六种描述方式具体可以理解为：若收端设备确定第一SCI指示的侧行链路的数据是新接收的数据，或首次接收的数据，则收端设备启动第一定时器。
示例性的，若第一SCI指示侧行链路的传输为新的传输，则收端设备启动第一定时器；或者，若第一SCI指示侧行链路的传输不为新的传输，且对于收端设备侧行链路的传输为新的传输，则收端设备启动第一定时器。示例性的，“第一SCI指示侧行链路的传输不为新的传输”，具体可以为：若第一SCI指示的数据传输为重传且对于收端设备来说，所述重传数据是新数据。“第一SCI指示的数据传输为重传”，也可以理解为“第一SCI指示本次调度的数据传输为重传”，或者“第一SCI指示这是一次数据重传”。具体的，指示数据传输为重传，可以通过HARQ进程号，结合NDI进行指示，也可以通过NDI直接进行指示。
应理解，“侧行链路的传输是新的传输”是收端设备确定的。“指示侧行链路的传输为新的传输”是第一发端设备所发送的第一SCI中的信息。
本申请中，初传/初次传输/第一次传输中任何一者与新的传输(new transmission)，或初始的传输(initial transmission)可以替换。
可选的，第一SCI为两级SCI中的第二级SCI。示例性的，第二级SCI包含初传指示或重传指示，所以收端设备成功解码指示侧行链路初始传输的第一SCI之后启动第一定时器。
可选的，第一SCI为两级SCI中的第一级SCI和第二级SCI。示例性的，第二级SCI包含初传指示或重传指示，第二级SCI依赖于对第一级SCI的解码。所以收端设备成功解码指示侧行链路初始传输的第一SCI之后启动第一定时器。
示例性的，容易理解的是：若第一SCI指示的数据传输为初传，则收端设备启动第一定时器，是指：当第一SCI指示为新数据或初传数据时，则收端设备接收到一个指示初传的SCI；或者，当第一SCI指示为重传数据时且收端设备初次接收到第一SCI，则收端设备接收到一个指示初传的SCI。示例性的，当第一SCI指示为重传数据时且收端设备初次接收到第一SCI，指的是：收端设备初次接收到调度该重传数据的第一SCI。
由于第一SCI指示的数据传输为初传，或收端设备首次接收到该第一SCI，存在接收失败的可能性。在收端设备初传接收失败的情况下，由于收端设备的第一定时器已启动。如此，在接下来的一段时间内，收端设备仍处于激活期，能够继续接收第一发端设备的信息。若第一发端设备重传上述数据传输的信息或初传别的数据传输的信息，则收端设备仍能够接收上述数据传输的信息，提高数据传输的信息传输效率，提高检测可靠性。
示例性的，关于“第二SCI”的相关说明如下：
在第一SCI还指示资源预留周期的情况下，第二SCI包括：第一目标周期中指示侧行链路的数据传输的初传或重传的SCI或第二目标周期中指示侧行链路的数据传输的初传或重传的SCI。其中，第一目标周期是接收第一SCI的资源预留周期，第二目标周期是第一目标周期之后的资源预留周期。这里，分两种示例进行说明：
示例一、在第一目标周期中，收端设备在各个传输资源上接收传输块之后，未向第一发端设备反馈ACK消息的情况下，或者，第一发端设备未接收到来自收端设备反馈的ACK 消息的情况下，第一目标周期中的各个传输资源均传输相同的传输块。相应的，在第一目标周期内，收端设备接收的第二SCI不包括用于侧行链路的数据传输的信息的初传的SCI。
示例二、在第一目标周期中，收端设备在各个传输资源上接收传输块之后，向第一发端设备反馈ACK消息。相应的，第一发端设备接收到来自收端设备反馈的ACK消息。此种情况下，第一目标周期中的各个传输资源可以传输不同的传输块。相应的，在第一目标周期内，收端设备接收的第二SCI包括用于侧行链路的数据传输的初传的SCI，且与第一SCI指示的数据传输的信息不同。例如，在一个资源预留周期预留三个传输资源，分别记为传输资源1、传输资源2和传输资源3。第一发端设备在传输资源1上向收端设备发送TB1。相应的，收端设备成功接收TB1之后，向第一发端设备反馈ACK消息。示例性的，ACK消息用于指示TB1成功接收。第一发端设备在传输资源2或传输资源3上向收端设备发送TB2。此场景下，TB1对应的SCI即为上述第一SCI，TB2对应的SCI即为上述第二SCI，属于上述第一目标周期中指示侧行链路的数据传输的初传的SCI。
在示例一和示例二描述的场景下，进一步地，由于不同资源预留周期中的传输资源可以传输不同TB块。相应的，在第二目标周期内，收端设备接收的第二SCI包括指示侧行链路的数据传输的初传的SCI。
在示例一和示例二描述的场景下，考虑到侧行链路通信过程中，由于收端设备周围其他终端的干扰或者半双工问题(即当收端设备发送信息时，不能接收信息，即不能同时收发信息)所导致的检测不可靠，“第一发端设备的重传”对于收端设备也可能是“新的传输”。所以，第二SCI还包括指示侧行链路的数据传输为重传的SCI。示例性的，“指示侧行链路的数据传输为重传的SCI”可以是第一目标周期中接收的SCI，也可以是第二目标周期中接收的SCI。也就是说，第二SCI还包括第一目标周期中指示侧行链路的数据传输为重传的SCI，或第二SCI还包括第二目标周期中指示侧行链路的数据传输为重传的SCI。
示例性的，初传，是从第一发端设备的角度来讲的，是真正意义上的初传。重传，也是从第一发端设备的角度来讲的。初传和重传的含义不同。但是在收端设备侧，需要根据上述“第五种描述方式”来解释“新的传输”。也即，收端设备侧看到的第一SCI指示初传的含义。
示例性的，在收端设备侧，侧行链路物理层传递侧行链路HARQ进程(process)ID、新数据指示(new data indicator/indication，NDI)、源(source，SRC)ID、目的(destination，DEST)ID、区域(zone)ID、HARQ使能(enabled)状态、HARQ失效(disabled)状态、预留周期(periodicity)、预留的时域资源和预留的频域资源中至少一项给介质访问控制(media access control，MAC)层。例如，收端设备的侧行链路物理层传递预留周期、预留的时域资源、预留的频域资源、侧行链路HARQ进程ID和NDI给MAC层。再如，收端设备的侧行链路物理层传递预留周期、预留的时域资源、侧行链路HARQ进程ID和NDI给MAC层。又如，收端设备的侧行链路物理层传递预留周期、预留的时域资源和侧行链路HARQ进程ID给MAC层。
当执行侧行链路的DRX机制时，MAC层的MAC实体(entity)将根据侧行链路的任何一个定时器或多个定时器监测PSCCH或SCI。作为一种实施例，MAC实体根据第一定时器，第二定时器或重传定时器中的至少一个监测PSCCH或SCI。作为另一种实施例，MAC实体根据第一SCI所指示的预留周期、预留的时域资源、预留的频域资源，侧行链 路HARQ进程ID和NDI中的至少一个监测PSCCH。
本申请中，根据第一SCI也可以理解为根据第一PSCCH。发送第一SCI也可以理解为发送第一PSCCH。第一SCI也可以理解为第一PSCCH。类似的，第二SCI，第三SCI，第一SCI等都适用，不再赘述。理解为，即替换为或称之为。
在第一SCI为两级SCI时，因为第一级SCI承载在PSCCH上，第二级SCI承载在PSSCH中。本申请中，当第一SCI为两级SCI时，根据第一SCI也可以理解为根据第一PSCCH和第一PSSCH；发送第一SCI也可以理解为发送第一PSCCH和第一PSSCH；第一SCI也可以理解为第一PSCCH和第一PSSCH。类似的，第二SCI，第三SCI，第一SCI等都适用，不再赘述。同样，本申请中，当第一SCI为两级SCI时，根据第一SCI也可以理解为根据第一PSCCH和部分(part of，partial)第一PSSCH；发送第一SCI也可以理解为发送第一PSCCH和部分第一PSSCH；第一SCI也可以理解为第一PSCCH和部分第一PSSCH。示例性的，第一PSSCH为第一PSCCH中的第一级SCI和第一PSSCH中的第二级SCI所调度的侧行链路数据所在的信道；部分(part of,partial)第一PSSCH为第一PSSCH中的用于承载第二级SCI的部分。
S803、收端设备确定第一运行时间。
示例性的，第一运行时间满足如下至少一项：
第一、网络设备配置的运行时间。
第二、第一SCI指示至少一个传输资源的资源位置。至少一个传输资源包括用于承载第二SCI的时域资源，第一运行时间至少与用于承载第二SCI的时域资源重叠。
示例性的，收端设备确定第一运行时间的方式可以例如但不限于如下方式：
方式一、网络设备向收端设备发送第一配置信息。相应的，收端设备接收来自网络设备的第一配置信息。
示例性的，第一配置信息指示第一定时器的运行时间。例如，第一配置新包括多个信元。其中，一个信元用于指示第一定时器的运行时间。如第一配置信息指示第一定时器的运行时间为30时隙。收端设备每次启动第一定时器之后，第一定时器的运行时间为30时隙(slot)，超过30时隙之后就停止运行。
如此，在收端设备启动第一定时器的情况下，第一定时器按照第一配置信息指示的运行时间运行，以方便网络设备管理收端设备的第一定时器的运行状况。
方式二、收端设备根据第一SCI，确定第一运行时间。
示例性的，第一SCI指示至少一个传输资源的资源位置。至少一个传输资源包括用于承载第二SCI的时域资源。第一运行时间至少与用于承载第二SCI的时域资源重叠。例如，一个传输资源中的前6个符号承载第二SCI。此种情况下，第一运行时间至少与每个传输资源的前6个符号重叠。
如此，在收端设备启动第一定时器的情况下，第一定时器的运行时间至少与用于承载第二SCI的时域资源重叠，以使得第一发端设备通过预留的传输资源向收端设备发送第二SCI时，收端设备能够及时接收来自第一发端设备的第二SCI，避免由于收端设备的未处于激活期而导致的第二SCI接收遗漏的情况，从而提高第二SCI接收的成功率。
示例性的，对于至少一个传输资源中的每个传输资源而言，一个传输资源还包括用于承载数据传输的信息的时域资源。可选的，在第一运行时间与用于承载第二SCI的时域资 源重叠之外，第一运行时间还与用于承载数据传输的信息的一部分时域资源重叠，或者，第一运行时间还与用于承载数据传输的信息的全部时域资源重叠。
方式三、收端设备先采用方式一确定第一定时器的运行时间，再通过方式二来调整第一定时器的运行时间，将调整后的运行时间作为最终的第一运行时间。
例如，收端设备先启动第一定时器，默认第一定时器的运行时间为30时隙。在第一定时器的运行时间内，收端设备通过方式二来调整第一定时器的运行时间，将调整后的运行时间作为最终的第一运行时间。
如此，收端设备通过上述三种方式来确定第一运行时间。在通过方式二和方式三确定第一运行时间的情况下，第一运行时间满足如下三个方面的说明，具体如下：
第一方面、针对承载第二SCI的时域资源与第二定时器的运行时间的重叠状况，对第一运行时间进行说明。示例性的，分如下两种可能的实现方式进行说明：
第一种可能的实现方式：第一运行时间至少包括第(F-1)个资源预留周期中的首个传输资源中承载第二SCI的时域资源。示例性的，第F个资源预留周期中的首个传输资源中承载第二SCI的时域资源与第二定时器的运行时间重叠，且第(F-1)个资源预留周期中的首个传输资源中承载第二SCI的时域资源与第二定时器的运行时间不重叠。F为正整数，且F≥3。第1个资源预留周期是接收第一SCI的资源预留周期。
示例性的，由于第(F-1)个资源预留周期中的首个传输资源中承载第二SCI的时域资源与第二定时器的运行时间不重叠，且第F个资源预留周期中的首个传输资源中承载第二SCI的时域资源与第二定时器的运行时间重叠。所以，与承载第二SCI的时域资源所重叠的第二定时器为第一SCI所在的第二定时器之后的第二定时器。例如，第一SCI的接收时刻对应第二定时器的第一DRX周期的运行时间。承载第一SCI的资源与第二定时器的第一DRX周期的运行时间重叠。第F个资源预留周期中的首个承载第二SCI的时域资源与第二定时器的第二DRX周期的运行时间重叠。第二DRX周期是第一DRX周期之后的DRX周期。例如，第二DRX周期是第一DRX周期之后的第一个DRX周期，或者，第二DRX周期是第一DRX周期之后的第二个DRX周期，或者，第二DRX周期是第一DRX周期之后的第N个DRX周期，本申请实施例对此不作限定。关于第二定时器的介绍可以参见S801中的相关说明，此处不再赘述。对于第2个资源预留周期至第(F-2)个资源预留周期而言，这些资源预留周期中的首个承载第二SCI的时域资源与第二定时器的运行时间可以重叠，也可以不重叠，本申请实施例对此不作限定。
例如，参见图9(a)，以F＝6为例，即第6个资源预留周期中的首个承载第二SCI的时域资源与第二定时器的运行时间重叠。相应的，第5个资源预留周期中的首个承载第二SCI的时域资源与第二定时器的运行时间不重叠。第2个资源预留周期、第3个资源预留周期和第4个资源预留周期中的首个承载第二SCI的时域资源与第二定时器的运行时间均重叠。此种情况下，收端设备确定第一运行时间至少包括第5个资源预留周期中的首个承载第二SCI的时域资源。如此，在第5个资源预留周期中的首个承载第二SCI的时域资源中，收端设备处于激活期，能够接收首个传输资源中承载的第二SCI，提高了相应传输资源上的第二SCI的接收成功率。
再如，参见图9(b)，仍以F＝6为例，在第2个资源预留周期、第3个资源预留周期和第4个资源预留周期中，也存在首个承载第二SCI的时域资源与第二定时器的运行时间 不重叠的资源预留周期。例如，上述三个资源预留周期的首个承载第二SCI的时域资源与第二定时器的运行时间均不重叠。此种情况下，第一运行时间除了与第5个资源预留周期中的首个传输资源中承载第二SCI的时域资源重叠之外，还可以与上述三个资源预留周期中至少一个资源预留周期的首个承载第二SCI的时域资源重叠。如此，在更多个资源预留周期中的首个承载第二SCI的时域资源中，收端设备处于激活期，也就能够接收更多个资源预留周期的首个传输资源中承载的第二SCI，提高了相应传输资源上的第二SCI的接收成功率。
第二种可能的实现方式：第一运行时间分别与N个资源预留周期中的首个传输资源中承载第二SCI的时域资源重叠。示例性的，N个资源预留周期早于第F个资源预留周期，且N个资源预留周期中每个资源预留周期的首个承载第二SCI的时域资源与第二定时器的运行时间不重叠。第F个资源预留周期中的首个承载第二SCI的时域资源与第二定时器的运行时间重叠，且第(F-1)个资源预留周期中的首个承载第二SCI的时域资源与第二定时器的运行时间不重叠。第1个资源预留周期是接收第一SCI的资源预留周期。F和N均为正整数，且F≥3，1≤N≤(F-2)。关于第二定时器的介绍可以参见S801中的相关说明，此处不再赘述。
示例性的，对于第2个资源预留周期至第(F-1)个资源预留周期而言，这些资源预留周期的首个承载第二SCI的时域资源与第二定时器的运行时间均不重叠。此种情况下，N的取值为(F-2)。
对于第2个资源预留周期至第(F-1)个资源预留周期而言，这些资源预留周期的部分资源预留周期的首个承载第二SCI的时域资源与第二定时器的运行时间不重叠。此种情况下，N的取值小于(F-2)。由于第(F-1)个资源预留周期中的首个承载第二SCI的时域资源与第二定时器的运行时间不重叠，所以，N的取值最小等于1。
如此，在上述N个资源预留周期中每个资源预留周期的首个承载第二SCI的时域资源中，收端设备处于激活期，能够接收上述N个资源预留周期的首个传输资源中承载的第二SCI，提高了相应传输资源上的第二SCI的接收成功率。
第二方面、针对第一SCI对至少一个传输资源的指示方式，对第一运行时间进行说明。这里，分两种可能的实现方式进行说明：
第一种可能的实现方式：在第一SCI还指示资源预留周期的情况下，第一SCI指示的至少一个传输资源包括第一传输资源。第一运行时间与第二目标周期中的第一传输资源中承载第二SCI的时域资源重叠。示例性的，第一目标周期是接收第一SCI的资源预留周期。第二目标周期为第一目标周期之后的资源预留周期。也就是说，在第二目标周期中的第一传输资源中承载第二SCI的时域资源上，收端设备处于激活期，能够接收上述第二目标周期的第一传输资源中承载的第二SCI，减少了第二SCI未及时接收的现象。
在上述第一种可能的实现方式下，进一步地，第一目标周期的第一传输资源早于接收第一SCI的传输资源。也就是说，第一SCI向后(past)指示预留的第一传输资源。示例性的，也可以称之为，接收第一SCI的传输资源为第一传输资源之后的资源，或接收第一SCI的传输资源在时间域上晚于第一传输资源。
例如，参见图9(c)，一个资源预留周期包括至少一个传输资源，分别记为传输资源1和传输资源2。在一个资源预留周期中，传输资源1早于传输资源2。示例性的，传输资 源1即为上述第一传输资源。第一SCI通过第一目标周期的传输资源2传输。此种情况下，第一运行时间与第二目标周期中的传输资源1中承载第二SCI的时域资源重叠。
如此，在第一SCI向后指示预留的传输资源的情况下，收端设备也能够确定第一运行时间与承载第二SCI的时域资源重叠，提高上述传输资源上的第二SCI的接收成功率。
在上述第一种可能的实现方式下，进一步地，第一目标周期的第一传输资源是第一SCI所属的传输资源。也就是说，第一SCI位于/承载于该第一目标周期的第一传输资源，占据该第一传输资源中的部分符号。第一SCI指示的至少一个传输资源还包括第二传输资源，且第一传输资源和第二传输资源位于同一资源预留周期中，第一传输资源早于第二传输资源。也就是说，第一SCI向前(forward)指示预留的传输资源。第一运行时间与以下至少一项的时域资源重叠：
第一目标周期中的第二传输资源中承载第二SCI的时域资源；
第二目标周期中的第一传输资源中承载第二SCI的时域资源；
第二目标周期中的第二传输资源中承载第二SCI的时域资源。
例如，参见图9(d)，一个资源预留周期包括至少一个传输资源，分别记为传输资源1和传输资源2。在一个资源预留周期中，传输资源1早于传输资源2。示例性的，传输资源1即为上述第一传输资源。传输资源2即为上述第二传输资源。第一SCI是在第一目标周期的传输资源1上传输。此种情况下，第一运行时间与预留的时域资源重叠状况分为如下三种：
第一种、第一运行时间与第二目标周期中的传输资源1中承载第二SCI的时域资源重叠，且与第一目标周期中的传输资源2中承载第二SCI的时域资源重叠，如图9(d)中第一行所示的第一运行时间。
第二种、第一运行时间与第二目标周期中的传输资源1中承载第二SCI的时域资源重叠，且与第二目标周期中的传输资源2中承载第二SCI的时域资源重叠，如图9(d)中第二行所示的第一运行时间。
第三种、第一运行时间与第二目标周期中的传输资源1中承载第二SCI的时域资源重叠，且与第一目标周期中的传输资源2中承载第二SCI的时域资源重叠，且与第二目标周期中的传输资源2中承载第二SCI的时域资源重叠，如图9(d)中第三行所示的第一运行时间。
如此，在第一SCI向前指示预留的传输资源的情况下，收端设备也能够确定第一运行时间与承载第二SCI的时域资源重叠，提高上述传输资源上的第二SCI的接收成功率。
第二种可能的实现方式：若至少一个传输资源包括第一传输资源，且第一传输资源早于接收第一SCI的传输资源，则第一运行时间至少与第二目标周期中第一传输资源中承载第二SCI的时域资源重叠。示例性的，第一目标周期是接收第一SCI的资源预留周期。第二目标周期为第一目标周期之后的资源预留周期。示例性的，第一传输资源早于接收第一SCI的传输资源，也可以称之为，接收第一SCI的传输资源为第一传输资源之后的资源，或接收第一SCI的传输资源在时间域上晚于第一传输资源。
若至少一个传输资源包括第一传输资源和第二传输资源，且第一传输资源和第二传输资源位于同一资源周期中，第一传输资源早于第二传输资源。接收第一SCI的传输资源为第一传输资源且位于第一目标周期中，则第一运行时间与下述至少一项重叠：
第一目标周期中第二传输资源中承载第二SCI的时域资源；
第二目标周期中第一传输资源中承载第二SCI的时域资源；
第二目标周期中第二传输资源中承载第二SCI的时域资源。
示例性的，关于第一目标周期和第二目标周期的说明可以参见“第二SCI”中的相关描述，此处不再赘述。
需要说明的是，在第二种可能的实现方式下，第一目标周期中第一传输资源上传输的SCI可以是收端设备接收失败的SCI，也可以是指示非周期性传输的SCI，本申请实施例对此不作限定。
第三方面、对第一运行时间的连续性进行说明，具体如下：第一运行时间可以是连续的，也可以是非连续的。示例性的，“第一运行时间是连续的”，是指，在启动第一定时器之后，第一定时器始终处于运行状态，直至到达预设时刻点。“第一运行时间是非连续的”，是指，一段时长之内有间歇。可选的，当第一定时器时长为35时隙，中间间歇两次，每次5时隙，那么，第一定时器实际运行的持续时间(on duration)长度为25时隙。可选的，当第一定时器时长为25时隙，中间间歇两次，每次5时隙。那么，第一定时器实际运行的持续时间(on duration)长度为25时隙，加上两次间歇的时间，实际时间持续长度是35时隙。示例性的，第一定时器间歇性运行可以是间歇一次，也可以是中间间歇多次。第一定时器可以按照一定的周期运行，也可以是非周期性运行。
在第一SCI还指示资源预留周期的情况下，若资源预留周期小于或等于第一阈值，则第一运行时间为连续的，也可以为非连续的。若资源预留周期大于或等于第二阈值，则第一运行时间为非连续的。示例性的，第一阈值小于第二阈值。或者，若资源预留周期小于或等于第一阈值，则第一运行时间为连续的，也可以为非连续的。若资源预留周期大于第一阈值，则第一运行时间为非连续的。当然，也可以是：若资源预留周期小于第一阈值，则第一运行时间为连续的，也可以为非连续的。若资源预留周期大于或等于第一阈值，则第一运行时间为非连续的。这里，第一阈值和第二阈值可以是预配置的数值。
下面，分两个示例进行说明：
示例一、参见图10(a)，以资源预留周期小于或等于第一阈值的场景为例，第1个资源预留周期是接收第一SCI的资源预留周期。在第2个资源预留周期至第(F-1)个资源预留周期中，每个资源预留周期的首个承载第二SCI的时域资源与第二定时器的运行时间不重叠。第F个资源预留周期中的首个承载第二SCI的时域资源与第二定时器的运行时间重叠。示例性的，F为正整数，且F≥3。作为一种可能的设计，启动第一定时器之后，第一定时器至少运行至第(F-1)个资源预留周期的首个承载第二SCI的时域资源结束，如图10(a)所示。这里，针对图10(a)中的第二定时器的运行时间进行说明：在图10(a)中，第1个资源预留周期所对应的第二定时器的运行时间(on duration)与第6个资源预留周期所对应的第二定时器的运行时间可以相同，也可以不同。通常情况下，两者是相同。当RRC信令修改了DRX周期(cycle)中的on duration时，会出现上述不同。在图10(a)所示的情况下，第一运行时间是连续的。作为另一种可能的设计，启动第一定时器之后，第一运行时间至少与(F-1)个资源预留周期的首个承载第二SCI的时域资源重叠。第一定时器的运行周期等于上述资源预留周期，如图10(b)或图10(c)所示。此种情况下，第一运行时间是非连续的。
在示例一的场景下，作为一种可能的实现过程：在图10(b)中，一个方框表示一个传输资源。若一个资源预留周期中包括两个传输资源，分别记为传输资源A和传输资源B。示例性的，第1个资源预留周期中的两个传输资源分别记为传输资源A1和传输资源B1。第2个资源预留周期中的两个传输资源分别记为传输资源A2和传输资源B2。第3个资源预留周期中的两个传输资源分别记为传输资源A3和传输资源B3。后续资源预留周期中的传输资源记法，以此类推。收端设备在传输资源A1上未能成功接收来自第一发端设备的第一SCI，或者，收端设备在传输资源A1上成功接收来自第一发端设备的第一SCI，但传输资源A1上的第一SCI指示的传输资源是非周期性的，如图10(b)中标“X”的方框所示。收端设备在传输资源A2上成功接收来自第一发端设备的第一SCI，如图10(b)中标“√”的方框所示。第一定时器的运行周期等于上述资源预留周期，且第一定时器每次的启动时刻向前延长一定的间隙(Gap)时间。该间隙时间即为：同一个资源预留周期中的传输资源A的起始时刻与传输资源B的起始时刻之间的差值，如图10(b)中的Gap1所示。
在示例一的场景下，作为另一种可能的实现过程：在图10(c)中，一个方框表示一个传输资源。各个传输资源记法可以参见图10(b)的相关说明，此处不再赘述。收端设备在传输资源A1上未能成功接收来自第一发端设备的第一SCI，或者，收端设备在传输资源A1上成功接收来自第一发端设备的第一SCI，但传输资源A1上的第一SCI指示的传输资源是非周期性的，如图10(c)中标“X”的方框所示。收端设备在传输资源A2上成功接收来自第一发端设备的第一SCI，如图10(c)中标“√”的方框所示。第一定时器的运行周期等于上述资源预留周期，且第一定时器每次的启动时刻向前推移一定的间隙时间。关于时间间隙的说明可以参见图10(b)中的介绍，此处不再赘述。在图10(c)中，第2个资源预留周期中的实线折线表示收端设备更新后的第一定时器的运行时间，第2个资源预留周期中的虚线折线表示收端设备更新前的第一定时器的运行时间。第3个资源预留周期中的实线折线表示收端设备更新后的第一定时器的运行时间，第3个资源预留周期中的虚线折线表示收端设备更新前的第一定时器的运行时间。
示例二、以资源预留周期大于或等于第二阈值的场景为例，第1个资源预留周期是接收第一SCI的资源预留周期。在第2个资源预留周期至第(F-1)个资源预留周期中，每个资源预留周期的首个承载第二SCI的时域资源与第二定时器的运行时间不重叠。第F个资源预留周期中的首个承载第二SCI的时域资源与第二定时器的运行时间重叠。示例性的，F为正整数，且F≥3。也就是说，第F个资源周期是从第1个资源周期之后的资源周期中首个传输资源上承载第二SCI的时域资源与第二定时器的运行时间重叠的最早的资源周期。若启动第一定时器之后，第一定时器至少运行至第(F-1)个资源预留周期的首个承载第二SCI的时域资源结束。此种情况下，由于资源预留周期较大，导致第一运行时间过长，使得收端设备的功耗过大。为了节省收端设备的功耗，通常将第一运行时间设置为非连续的。例如，若启动第一定时器之后，第一运行时间与F个资源预留周期的首个承载第二SCI的时域资源重叠。第一定时器的运行周期等于上述资源预留周期。
如此，在第一运行时间是连续的情况下，收端设备能够在更长的时间内处于激活期，以接收来自其他设备(如第一发端设备、除第一发端设备之外的其他发端设备、网络设备等)的信息，减少SCI未及时接收的现象。在第一运行时间是非连续的情况下，收端设备能够减少运行时间，在提高SCI接收成功率的同时，也能够节省功耗。在资源预留周期过 大的情况下，第一运行时间是非连续的，以减少第一定时器的运行时间，节省收端设备的功耗，且在一定程度上提高了SCI接收成功率。
下面，再对执行S803的触发条件进行说明，具体可以例如但不限于如下方式：若在当前时刻所在资源预留周期之后的资源预留周期中，至少一个承载第二SCI的时域资源中存在未与第二定时器的运行时间重叠的时域资源，则收端设备确定第一运行时间。
示例性的，“存在未与第二定时器的运行时间重叠”的时域资源可以是一个资源预留周期中的一个时域资源，也可以是一个资源预留周期中的多个时域资源。“存在未与第二定时器的运行时间重叠”的时域资源还可以是指：一个资源预留周期中预留的K个传输资源中前k个传输资源上的时域资源。其中，K和k均为正整数，且1≤k≤K。
示例性的，“存在未与第二定时器的运行时间重叠的时域资源”的资源预留周期，可以是一个资源预留周期，也可以是多个资源预留周期。“存在未与第二定时器的运行时间重叠的时域资源”的资源预留周期是指：当前时刻所在资源预留周期之后的第1个资源预留周期。也就是说，若在当前时刻所在资源预留周期的下一个资源预留周期中，存在未与第二定时器的运行时间重叠的传输资源，则收端设备确定第一运行时间。当然，“存在未与第二定时器的运行时间重叠的时域资源”的资源预留周期也可以是指：当前时刻所在资源预留周期之后的第2个资源预留周期，或当前时刻所在资源预留周期之后的第3个资源预留周期，本申请实施例对此不作限定。
如此，若某一个资源预留周期中存在未与第二定时器的运行时间重叠的时域资源，且该资源预留周期是当前时刻所在资源预留周期之后的资源预留周期，则收端设备确定第一运行时间，以使收端设备在相应的传输资源的时域资源上是激活的，能够监测第二SCI，减少SCI未及时接收的现象。
本申请实施例提供的通信方法，收端设备接收来自第一发端设备的第一SCI之后，启动第一定时器。由于第一定时器的运行时间(即第一运行时间)内，收端设备能够监测第二SCI和/或侧行链路的数据传输的信息，也就延长了收端设备处于激活期的时间，以接收更多的第二SCI，减少第二SCI未及时接收的现象。相应的，在收端设备及时监测第二SCI的情况下，收端设备也就能够及时接收数据传输的信息，降低数据传输时延。
在一些实施例中，收端设备还能够接收来自第二发端设备的第三SCI。参见图11，本申请实施例通信方法还包括如下步骤：
S1101、第一发端设备向收端设备发送第一SCI。相应的，收端设备接收来自第一发端设备的第一SCI。
示例性的，S1101的具体实现过程可以参见S801的相关说明，此处不再赘述。
S1102、收端设备启动与第一SCI对应的第一定时器。
示例性的，关于第一定时器的相关说明可以参见S802的相关说明，此处不再赘述。
示例性的，收端设备配置多个第一定时器。在收端设备接收第一SCI之后，从多个第一定时器中启动一个第一定时器，该第一定时器即为第一SCI对应的第一定时器，记为定时器1。
S1103、第二发端设备向收端设备发送第三SCI。相应的，收端设备接收来自第二发端设备的第三SCI。
示例性的，S1103的具体实现过程可以参见S801的相关说明，此处不再赘述。
S1104、收端设备启动与第三SCI对应的第一定时器。
示例性的，在收端设备配置多个第一定时器的情况下，在收端设备接收第三SCI之后，从多个第一定时器中启动一个第一定时器，该第一定时器即为第三SCI对应的第一定时器，记为定时器2。定时器1与定时器2是不同的第一定时器。
需要说明的是，收端设备可以先执行S1101，再执行S1103。收端设备也可以先执行S1103，再执行S1101。收端设备还可以同时执行S1101和S1103。本申请实施例对S1101和S1103的执行顺序不作限定。
如此，收端设备接收来自不同SCI之后，启动不同的第一定时器。各个第一定时器按照各自的运行时间运行，避免“采用一个第一定时器的情况下，在后启动的第一定时器的运行时间覆盖在前启动的第一定时器的运行时间”的情况。例如，在收端设备配置一个第一定时器的情况下，收端设备先接收的SCI指示周期性预留的传输资源，此时，第一定时器的运行时间与周期性预留的传输资源的时域资源重叠。之后，收端设备再接收的SCI指示非周期性预留的传输资源，则第一定时器的运行时间与非周期性预留的传输资源的时域资源重叠。相应的，在先接收的SCI指示的周期性预留的传输资源的时域资源上，第一定时器不再运行，收端设备也就无法及时接收相应传输资源上的SCI。而本申请实施例通信方法中，收端设备针对不同的SCI启动不同的第一定时器，如此，不同第一定时器的运行时间互不影响，也就不存在第一定时器的运行时间被覆盖的现象，使得收端设备能够及时接收SCI，以提高SCI接收成功率。
这里，也可以理解为，收端设备对根据来自不同的发端设备和/或网络设备所启动的第一定时器的运行时间作并集，从而保证对第一发端设备、除第一发端设备之外的其他发端设备以及网络设备中的任何一方都能够保证接收成功率。也就是说，收端设备在接收来自不同的发端设备的SCI之后，确定各个发端设备所对应的第一定时器的运行时间，和/或，收端设备在接收来自网络设备的SCI之后，确定网络设备所对应的第一定时器的运行时间，再将所确定的第一定时器的运行时间作并集，从而保证对第一发端设备、除第一发端设备之外的其他发端设备以及网络设备中的任何一方都能够保证接收成功率。
在一些实施例中，若收端设备先执行S1101，再执行S1103。也就是说，第一SCI的接收时刻早于第三SCI的接收时刻。示例性的，第二发端设备的第二SCI对应的第一定时器的运行时间描述为第三运行时间。第三运行时间包括第一运行时间。也就是说，第三运行时间包括第一运行时间未执行的运行时间。
例如，第一SCI指示的传输资源为资源集合1，资源集合1包括传输资源A1、传输资源A2和传输资源A3，如图12中斜线填充的方框所示。传输资源A1的时域资源早于传输资源A2的时域资源，传输资源A2的时域资源早于传输资源A3的时域资源。第三SCI指示的传输资源为资源集合2，资源集合2包括传输资源B1、传输资源B2和传输资源B3，如图12中空白方框所示。传输资源B1的时域资源早于传输资源B2的时域资源，传输资源B2的时域资源早于传输资源B3的时域资源。收端设备在传输资源A1上接收来自第一发端设备的第一SCI，收端设备在传输资源B1上接收来自第二发端设备的第三SCI。
参见图12，在资源集合1中和资源集合2中的传输资源的时域资源均不同的情况下，第一运行时间与资源集合1中的传输资源的时域资源(如传输资源A1的部分时域资源、传输资源A2的时域资源、传输资源A3的时域资源)重叠，如图12中的粗线折线所示。 第三运行时间除了与资源集合2中的传输资源的时域资源(如传输资源B1的部分时域资源、传输资源B2的时域资源、传输资源B3的时域资源)重叠，如图12中的粗线折线所示，还与资源集合1中剩余的传输资源的时域资源重叠，如图12中的细线折线所示。示例性的，“剩余的传输资源”是指：晚于传输资源B1的传输资源。例如，若传输资源A2和传输资源A3均晚于传输资源B1，则“剩余的传输资源”包括传输资源A2和传输资源A3。第三运行时间还与传输资源A2的时域资源和传输资源A3的时域资源重叠。
需要说明的是，在第三运行时间包括第一运行时间的情况下，第一SCI对应的第一定时器和第三SCI对应的第一定时器可以是同一第一定时器，也可以是不同的第一定时器。
如此，在后启动的第一定时器的运行时间包括在先启动的第一定时器的运行时间，即使部分第一定时器失效，仍能够保证收端设备在第一SCI指示的传输资源的时域资源上处于激活期，以及时接收来自第一发端设备的SCI，提高接收SCI的成功率。
可选的，收端设备执行S1103之后，执行S1105：
S1105、收端设备根据第一运行时间和第三SCI，确定第三运行时间。
示例性的，第一运行时间的相关说明可以参见S803的相关描述，此处不再赘述。第三SCI指示至少一个传输资源的资源位置。第三SCI指示的传输资源可以是周期性的，也可以是非周期性的。第三运行时间包括第一运行时间，具体可以参见上述说明，此处不再赘述。
在实际应用过程中，S1105的具体实现过程可以为如下两个步骤：
步骤一、收端设备根据第三SCI，确定第二运行时间。
示例性的，步骤一的具体实现过程可以参见S803的相关描述，此处不再赘述。
步骤二、收端设备将第一运行时间和第二运行时间的并集作为第三运行时间。
示例性的，“收端设备将第一运行时间和第二运行时间的并集作为第三运行时间”具体包括：收端设备将第一运行时间中未运行的时间和第二运行时间的并集作为第三运行时间。
示例性的，参见图13，在图13中，一个方框表示一个传输资源。以第一SCI预留周期性资源为例。一个资源预留周期中包括1个传输资源。示例性的，第1个资源预留周期中的传输资源记为传输资源A1。第2个资源预留周期中的传输资源记为传输资源A2。第3个资源预留周期中的传输资源记为传输资源A3。第一运行时间如图13中粗实线所示。第三SCI预留的是非周期性的传输资源，如图13中传输资源B1和传输资源B2。第二运行时间如图13中的细实线所示。第三运行时间是第一运行时间和第二运行时间的并集，如图13所示。
如此，收端设备以取并集的方式，确定在后启动的第一定时器的运行时间，以使得在后启动的第一定时器的运行时间包括在前启动的第一定时器的运行时间，以避免收端设备遗漏预留的传输资源上的控制信息和数据传输的信息。
需要说明的是，图8至图13所描述的通信方法中涉及的“第一定时器”均指：收端设备侧的第一定时器。图8至图13所描述的通信方法中涉及的“第二定时器”均指：收端设备侧的第二定时器。
以上均是针对收端设备侧的通信方法的描述，下面，再对发端设备的资源预留过程进行说明。参见图14，本申请实施例通信方法包括如下步骤：
S1401、发端设备确定k个第一传输资源。
示例性的，k个第一传输资源中承载第一SCI的时域资源与第二定时器的运行时间重叠。示例性的，k个第一传输资源属于K个第一传输资源中的资源。
示例性的，第二定时器的运行时间属于发端设备的激活期。第二定时器的运行时间用于发端设备监测侧行链路的控制信息和/或数据传输的信息，也可以用于发端设备发送侧行链路的控制信息和/或数据传输的信息。这里，第二定时器的运行时间可以由网络设备配置。不同终端设备之间的第二定时器的运行时间是一致的。也就是说，若发端设备的第二定时器处于运行状态，则收端设备的第二定时器也处于运行状态。如此，发端设备确定的k个第一传输资源中承载第一SCI的时域资源也与收端设备的第二定时器的运行时间重叠。可选的，第二定时器的运行时间也可以由侧行链路上的发端设备配置。例如，一个组的组头为一个组的组员配置相同的第二定时器的运行时间。
示例性的，第一SCI为两级SCI中的第一级SCI，或第一SCI为两级SCI中的第二级SCI，或者第一SCI为两级SCI中的第一级SCI和第二级SCI。
示例性的，K个第一传输资源是发端设备预留的传输资源。这里，第一传输资源可以是周期性的传输资源，可以是非周期性的传输资源。若第一传输资源是周期性的传输资源，则第一SCI指示资源预留周期，K个第一传输资源为一个资源预留周期中的传输资源。
示例性的，K和k为正整数，且1≤k≤K。这里，参数k可以是预定义的参数，也可以由网络设备配置。例如，网络设备向发端设备发送第二配置信息。相应的，发端设备接收来自网络设备的第二配置信息。示例性的，第二配置信息指示k的取值。例如，第二配置新包括多个信元。其中，一个信元用于指示k的取值。如此，发端设备即可按照第二配置信息指示的k的取值，预留与第二定时器的运行时间重叠的第一传输资源。
示例性的，关于k个第一传输资源的位置，具体说明如下：
作为第一种情况，参见图15中第一行的“第二定时器的运行时间”，k个第一传输资源可以是K个第一传输资源中的后k个第一传输资源。以一个资源预留周期预留3个传输资源为例，这3个传输资源分别记为传输资源1、传输资源2和传输资源3。图15中第一行的“第二定时器的运行时间”与传输资源2和传输资源3重叠。
作为第二种情况，参见图15中第二行的“第二定时器的运行时间”，k个第一传输资源可以是K个第一传输资源中的前k个第一传输资源。也就是说，K个第一传输资源中前k个第一传输资源中承载第一SCI的时域资源与第二定时器的运行时间重叠。以一个资源预留周期预留3个传输资源为例，这3个传输资源分别记为传输资源1、传输资源2和传输资源3。图15中第二行的“第二定时器的运行时间”与传输资源1和传输资源2重叠。示例性的，由于第一传输资源均能够向前指示预留的传输资源，也就是说，若收端设备接收到k个第一传输资源上传输的第一SCI，则收端设备能够根据第一SCI对传输资源的指示状态，确定k个第一传输资源之后的第一传输资源，进而在k个第一传输资源之后的第一传输资源上继续接收第一SCI，提高传输资源的利用率，使得收端设备能够接收到更多的第一SCI。
示例性的，参见图16，S1401的具体实现过程如下：
S14011、发端设备检测第二传输资源的信号强度。
示例性的，第二传输资源与预设定时器的运行时间重叠。
预设定时器包括以下定时器中的至少一项：
第一、第一定时器。示例性的，第一定时器的运行时间用于发端设备监测侧行链路的控制信息和/或数据传输的信息，也可以用于发端设备发送侧行链路的控制信息和/或数据传输的信息。
第二、第二定时器。示例性的，第二定时器的运行时间用于发端设备监测侧行链路的控制信息和/或数据传输的信息，也可以用于发端设备发送侧行链路的控制信息和/或数据传输的信息。
第三、重传定时器。示例性的，重传定时器的运行时间用于发端设备接收侧行链路的用于重传的控制信息和/或数据传输的信息。
上述对于第一定时器，第二定时器的解释适用于本申请别的实施例，不再赘述。
例如，侦听窗的时长为10ms，在一个DRX周期中，第二定时器的运行时间为2ms。若发端设备仅检测与第二定时器的运行时间重叠的传输资源，则需要检测5个DRX周期。若发端设备检测与上述三个定时器的运行时间重叠的传输资源，则需要检测的DRX周期少于5个DRX周期。
示例性的，第二传输资源的信号强度包括参考信号接收功率(reference signal receiving power，RSRP)、接收信号强度指示(received signal strength indicator，RSSI)和信干噪比(signal to interference plus noise ratio，SINR)中的至少一项。示例性的，RSRP为测量第二传输资源上参考信号得到的。RSSI为第二传输资源上的RSSI。SINR是对第二传输资源测量得到的。
示例性的，仍以图3的场景为例，发端设备在侦听窗内检测第二传输资源的信号强度。示例性的，第二传输资源可以是4个DRX周期。
S14012、发端设备根据第二传输资源的信号强度，确定至少K个第一传输资源。
示例性的，仍以图3的场景为例，在资源选择窗内，发端设备根据第二传输资源的信号强度，确定至少K个第一传输资源。例如，发端设备根据上述4个DRX周期的信号强度，在资源选择窗中，以4个DRX周期为一组，确定第一传输资源。若K的取值为5，则发端设备确定了至少5个第一传输资源。
示例性的，S14012可以具体实施为：若第二传输资源与预设定时器的运行时间重叠时长满足预设时长，则发端设备根据第二传输资源的信号强度，确定至少K个第一传输资源。也就是说，发端设备确定第二传输资源的检测时长满足侦听窗的时长，则发端设备即可在资源选择窗中确定待预留的第一传输资源。
S14013、发端设备根据至少K个第一传输资源与第二定时器的运行时间重叠状况，从至少K个第一传输资源中确定k个第一传输资源。示例性的，k个第一传输资源为K个第一传输资源中的资源。
示例性的，参见图17，以发端设备确定了8个第一传输资源为例，上述8个第一传输资源分别记为：传输资源1、传输资源2、传输资源3、传输资源4、传输资源5、传输资源6、传输资源7和传输资源8。示例性的，若上述8个第一传输资源均与第二定时器的运行时间不重叠，则上述资源选择窗中不存在满足要求的第一传输资源。若上述8个第一传输资源中至少一个第一传输资源与第二定时器的运行时间重叠，则上述资源选择窗中存在满足要求的第一传输资源。进一步地，若要求k个第一传输资源是K个第一传输资源中的前k个第一传输资源，则发端设备根据上述8个第一传输资源与第二定时器的运行时间重叠状况，调整资源选择窗的参数T 1和/或参数T 2的取值。例如，传输资源1和传输资源2 分别与第二定时器的运行时间不重叠，传输资源3和传输资源4分别与第二定时器的运行时间重叠，如图17所示。此种情况下，发端设备调整参数T 1的取值，以使该资源选择窗中的首个传输资源为传输资源3，如图17中所示的“调整后的资源选择窗”。示例性的，一个资源选择窗的传输资源即对应一个资源预留周期内的传输资源。当上述8个第一传输资源为非周期的资源，且k＝2,如果前两个第一传输资源与第二定时器的运行时间重叠，则可以确定第一传输资源。当上述8个或更多个第一传输资源为周期性的资源，且每个周期中的第一传输资源个数K＝3，且k＝2,如果第(3*(m-1)+1)个和第(3*(m-1)+2)个第一传输资源与第二定时器的运行时间重叠，无论第3m个第一传输资源与第二定时器的运行时间重叠或不重叠，则可以确定第一传输资源。其中m为正整数。
如此，发端设备基于第二传输资源的信号强度来确定至少K个第一传输资源，再结合至少K个第一传输资源与第二定时器的运行时间的重叠状况，从K个第一传输资源中确定k个第一传输资源与第二定时器的运行时间重叠。由于发端设备和收端设备的第二定时器的运行时间是一致的。所以，发端设备通过k个第一传输资源向收端设备发送第一SCI的情况下，收端设备也处于激活期，也就能够接收来自发端设备的第一SCI，从而提高第一SCI传输的有效性。
S1402、发端设备在k个第一传输资源上向收端设备发送第一SCI。相应的，收端设备在k个第一传输资源上接收来自发端设备的第一SCI。
示例性的，k个第一传输资源与第二定时器的运行时间重叠。发端设备与收端设备的第二定时器的运行时间是一致的。所以，发端设备发送第一SCI时，收端设备处于激活期，能够接收第一SCI，从而使得收端设备能够及时接收第一SCI。
本申请实施例提供的通信方法，发端设备确定k个第一传输资源中承载第一SCI的时域资源与第二定时器的运行时间重叠。由于发端设备与收端设备的第二定时器的运行时间是一致的。如此，发端设备在k个第一传输资源上发送第一SCI时，收端设备处于激活期，也就能够接收第一SCI，从而使得收端设备及时接收第一SCI的可能性，提高第一SCI的传输效率。
需要说明的是，S1401和S1402中涉及的定时器均指：发端设备侧的定时器。例如，第一定时器是指发端设备的第一定时器，第二定时器是指发端设备的第二定时器，重传定时器是指发端设备的重传定时器。
另外，本申请实施例中，“运行时间”也可以理解为“运行时长”。
上述主要从不同网元之间交互的角度对本申请实施例提供的方案进行了介绍。可以理解的是，收端设备、第一发端设备、第二发端设备和发端设备为了实现上述功能，其包含了执行各个功能相应的硬件结构和/或软件模块。结合本申请中所公开的实施例描述的各示例的单元及算法步骤，本申请实施例能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。本领域技术人员可以对每个特定的应用来使用不同的方法来实现所描述的功能，但是这种实现不应认为超出本申请实施例的技术方案的范围。
本申请实施例可以根据上述方法示例对通信装置进行功能单元的划分，例如，可以对应各个功能划分各个功能单元，也可以将两个或两个以上的功能集成在一个处理单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。需要 说明的是，本申请实施例中对单元的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。
图18示出了本申请实施例中提供的通信装置的一种示意性框图。该通信装置1800可以以软件的形式存在，也可以为设备，或者设备中的组件(比如芯片系统)。该通信装置1800包括：处理单元1802和通信单元1803。
通信单元1803还可以划分为发送单元(并未在图18中示出)和接收单元(并未在图18中示出)。示例性的，发送单元，用于支持通信装置1800向其他网元发送信息。接收单元，用于支持通信装置1800从其他网元接收信息。
当通信装置1800用于实现上述收端设备的功能时，示例性的，处理单元1802可以用于支持通信装置1800执行图8中的S802、S803、执行图11中的S1102、S1104和S1105，和/或用于本文所描述的方案的其它过程。通信单元1803用于支持通信装置1800和其他网元(例如第一发端设备、第二发端设备和发端设备)之间的通信。比如，通信单元用于支持通信装置1800执行图4所示的S403、执行图8所示的S801、执行图11所示的S1103、执行图14所示的S1402，和/或用于本文所描述的方案的其它过程。
当通信装置1800用于实现上述方法中第一发端设备的功能时，示例性的，通信单元1803用于支持通信装置1800和其他网元(例如收端设备)之间的通信。比如，通信单元用于支持通信装置1800执行图8所示的S801，和/或用于本文所描述的方案的其它过程。
当通信装置1800用于实现上述方法中第二发端设备的功能时，示例性的，通信单元1803用于支持通信装置1800和其他网元(例如收端设备)之间的通信。比如，通信单元用于支持通信装置1800执行图11所示的S1103，和/或用于本文所描述的方案的其它过程。
当通信装置1800用于实现上述发端设备的功能时，示例性的，处理单元1802可以用于支持通信装置1800执行图14中的S1401、执行图16中的S14011、S14012和S11013，和/或用于本文所描述的方案的其它过程。通信单元1803用于支持通信装置1800和其他网元(例如收端设备)之间的通信。比如，通信单元用于支持通信装置1800执行图14所示的S1402，和/或用于本文所描述的方案的其它过程。
可选的，通信装置1800还可以包括存储单元1801，用于存储通信装置1800的程序代码和数据，数据可以包括不限于原始数据或者中间数据等。
示例性的，处理单元1802可以是处理器或控制器，例如可以是CPU，通用处理器，数字信号处理(digital signal processing，DSP)，应用集成电路(application-specific integrated circuit，ASIC)，现场可编程门阵列(field programmable gate array，FPGA)或者其他可编程逻辑器件、晶体管逻辑器件、硬件部件或者其任意组合。其可以实现或执行结合本申请公开内容所描述的各种示例性的逻辑方框，模块和电路。处理器也可以是实现计算功能的组合，例如包含一个或多个微处理器组合，DSP和微处理器的组合等等。
通信单元1803可以是通信接口、收发器或收发电路等，示例性的，该通信接口是统称，在具体实现中，该通信接口可以包括多个接口，例如可以包括：发端设备和收端设备之间的接口和/或其他接口。
存储单元1801可以是存储器。
当处理单元1802为处理器，通信单元1803为通信接口，存储单元1801为存储器时，本申请实施例所涉及的通信装置1900可以为图19所示。
参阅图19所示，该通信装置1900包括：处理器1902、收发器1903、存储器1901。
示例性的，收发器1903可以为独立设置的发送器，该发送器可用于向其他设备发送信息，该收发器也可以为独立设置的接收器，用于从其他设备接收信息。该收发器也可以是将发送、接收信息功能集成在一起的部件，本申请实施例对收发器的具体实现不做限制。
可选的，通信装置1900还可以包括总线1904。示例性的，收发器1903、处理器1902以及存储器1901可以通过总线1904相互连接；总线1904可以是外设部件互连标准(peripheral component interconnect，PCI)总线或扩展工业标准结构(extended industry standard architecture，EISA)总线等。所述总线1904可以分为地址总线、数据总线、控制总线等。为便于表示，图19中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
本领域普通技术人员可以理解：在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包括一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，数字视频光盘(digital video disc，DVD))、或者半导体介质(例如固态硬盘(solid state disk，SSD))等。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统，装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络设备(例如终端设备)上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个功能单元独立存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用硬件加软件功能单元的形式实现。
通过以上的实施方式的描述，所属领域的技术人员可以清楚地了解到本申请可借助软件加必需的通用硬件的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分可 以以软件产品的形式体现出来，该计算机软件产品存储在可读取的存储介质中，如计算机的软盘，硬盘或光盘等，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述的方法。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，在本申请揭露的技术范围内的变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (49)

  1. 一种通信方法，其特征在于，包括：
    收端设备接收来自第一发端设备的第一侧行链路控制信息SCI；
    所述收端设备根据所述第一SCI，启动第一定时器；所述第一定时器的运行时间用于所述收端设备监测第二SCI和/或侧行链路的数据传输的信息。
  2. 根据权利要求1所述的通信方法，其特征在于，所述收端设备接收来自第一发端设备的第一SCI，包括：
    在第二定时器的运行时间内，所述收端设备接收来自所述第一发端设备的所述第一SCI；所述第二定时器的运行时间用于所述收端设备监测侧行链路的控制信息和/或数据传输的信息。
  3. 根据权利要求1或2所述的通信方法，其特征在于，所述收端设备根据所述第一SCI，启动第一定时器，包括：
    若所述收端设备确定所述第一SCI指示的侧行链路的传输是新的传输，则所述收端设备启动所述第一定时器。
  4. 根据权利要求1至3任一项所述的通信方法，其特征在于，所述收端设备根据所述第一SCI，启动第一定时器，包括：若所述第一SCI指示侧行链路的传输为新的传输，则所述收端设备启动所述第一定时器；
    或者，若所述第一SCI指示侧行链路的传输不为新的传输，且对于所述收端设备所述侧行链路的传输为新的传输，则所述收端设备启动所述第一定时器。
  5. 根据权利要求1至4任一项所述的通信方法，其特征在于，所述方法还包括：
    所述收端设备基于所述第一SCI指示的至少一个传输资源确定所述第一定时器的运行时间；
    其中，所述第一定时器的运行时间至少与承载所述第二SCI的时域资源重叠。
  6. 根据权利要求5所述的通信方法，其特征在于，
    所述第一定时器的运行时间至少包括第(F-1)个资源预留周期中的首个传输资源中承载所述第二SCI的时域资源；
    其中，第F个资源预留周期中的首个传输资源中承载所述第二SCI的时域资源与第二定时器的运行时间重叠，且第(F-1)个资源预留周期中的首个传输资源中承载所述第二SCI的时域资源与第二定时器的运行时间不重叠；所述F为正整数；所述第二定时器的运行时间用于所述收端设备监测侧行链路的控制信息和/或数据传输的信息。
  7. 根据权利要求6所述的通信方法，其特征在于，
    所述第F个资源预留周期中的首个承载所述第二SCI的时域资源与所述第二定时器的第二非连续接收DRX周期的运行时间重叠；
    其中，所述第二DRX周期是第一DRX周期之后的DRX周期；所述第一DRX周期是所述第一SCI的接收时刻对应的所述第二定时器所在的周期。
  8. 根据权利要求5至7任一项所述的通信方法，其特征在于，
    所述第一定时器的运行时间与第二目标周期中的第一传输资源中承载所述第二SCI的时域资源重叠；
    其中，所述第二目标周期为第一目标周期之后的资源预留周期；所述第一目标周期是 接收所述第一SCI的资源预留周期；所述第一SCI指示的至少一个传输资源包括所述第一传输资源。
  9. 根据权利要求8所述的通信方法，其特征在于，
    所述第一目标周期的第一传输资源早于接收所述第一SCI的传输资源；
    或者，所述第一目标周期的第一传输资源是所述第一SCI所属的传输资源。
  10. 根据权利要求8或9所述的通信方法，其特征在于，
    所述第一目标周期的第一传输资源是所述第一SCI所属的传输资源；
    若所述第一SCI指示的至少一个传输资源还包括第二传输资源，且所述第一传输资源和所述第二传输资源位于同一资源预留周期中，所述第一传输资源早于所述第二传输资源，则所述第一定时器的运行时间还与以下至少一项的时域资源重叠：
    所述第一目标周期中的第二传输资源中承载所述第二SCI的时域资源；
    所述第二目标周期中的第二传输资源中承载所述第二SCI的时域资源。
  11. 根据权利要求5至10任一项所述的通信方法，其特征在于，
    所述收端设备基于所述第一SCI指示的至少一个传输资源确定所述第一定时器的运行时间，包括：
    若在当前时刻所在资源预留周期之后的资源预留周期中，承载所述第二SCI的时域资源中存在未与第二定时器的运行时间重叠的时域资源，则所述收端设备基于所述第一SCI指示的至少一个传输资源确定所述第一定时器的运行时间；所述第二定时器的运行时间用于所述收端设备监测侧行链路的控制信息和/或数据传输的信息。
  12. 根据权利要求5至11任一项所述的通信方法，其特征在于，所述第一定时器的运行时间为连续或非连续的。
  13. 根据权利要求12所述的通信方法，其特征在于，
    若所述第一SCI指示的资源预留周期小于或等于第一阈值，则所述第一定时器的运行时间为连续的或非连续的；
    若所述第一SCI指示的资源预留周期大于或等于第二阈值，则所述第一定时器的运行时间为非连续的；
    其中，所述第一阈值小于所述第二阈值。
  14. 根据权利要求1至13任一项所述的通信方法，其特征在于，所述方法还包括：
    所述收端设备接收来自第二发端设备的第三SCI；
    所述收端设备启动与所述第三SCI对应的第一定时器；
    所述收端设备根据所述第一SCI，启动第一定时器，包括：
    所述收端设备启动与所述第一SCI对应的第一定时器；所述第一SCI对应的第一定时器的运行时间包括第一运行时间和第二运行时间的并集；所述第一运行时间至少与所述第一SCI指示的至少一个传输资源上承载所述第二SCI的时域资源重叠；所述第二运行时间至少与所述第三SCI指示的至少一个传输资源上承载SCI的时域资源重叠。
  15. 根据权利要求1至14任一项所述的通信方法，其特征在于，
    所述第一SCI为两级SCI中的第一级SCI；
    或，所述第一SCI为两级SCI中的第二级SCI；
    或，所述第一SCI为两级SCI中的第一级SCI和第二级SCI。
  16. 一种通信方法，其特征在于，包括：
    发端设备确定k个第一传输资源，其中，所述k个第一传输资源中承载第一侧行链路控制信息SCI的时域资源与第二定时器的运行时间重叠；所述k为正整数，且k≥1；所述k个第一传输资源是所述发端设备预留的传输资源；所述第二定时器的运行时间用于所述发端设备监测侧行链路的控制信息和/或数据传输的信息；
    所述发端设备在所述k个第一传输资源上向收端设备发送所述第一SCI。
  17. 根据权利要求16所述的通信方法，其特征在于，所述k个第一传输资源是K个第一传输资源中前k个第一传输资源；所述K个第一传输资源是所述发端设备预留的传输资源；所述K为正整数。
  18. 根据权利要求16或17所述的通信方法，其特征在于，所述k为预定义的参数；
    或者，所述方法还包括：
    所述发端设备接收来自网络设备的第二配置信息；所述第二配置信息指示所述k的取值。
  19. 根据权利要求16至18任一项所述的通信方法，其特征在于，所述发端设备确定k个第一传输资源，包括：
    所述发端设备检测第二传输资源的信号强度；其中，所述第二传输资源与预设定时器的运行时间重叠；
    所述发端设备根据所述第二传输资源的信号强度，确定至少K个第一传输资源；
    所述发端设备根据所述至少K个第一传输资源与所述第二定时器的运行时间重叠状况，从所述至少K个第一传输资源中确定所述k个第一传输资源。
  20. 根据权利要求19所述的通信方法，其特征在于，
    所述预设定时器包括以下定时器中的至少一项：
    第一定时器；所述第一定时器的运行时间用于所述发端设备监测侧行链路的控制信息和/或数据传输的信息；
    所述第二定时器；
    重传定时器。
  21. 根据权利要求16至20任一项所述的通信方法，其特征在于，
    所述k个第一传输资源为一个资源预留周期中的传输资源。
  22. 根据权利要求16至21任一项所述的通信方法，其特征在于，
    所述第一SCI为两级SCI中的第一级SCI，
    或，所述第一SCI为两级SCI中的第二级SCI，
    或，所述第一SCI为两级SCI中的第一级SCI和第二级SCI。
  23. 一种通信装置，其特征在于，包括处理器和收发器，其中：
    所述收发器，用于接收来自第一发端设备的第一侧行链路控制信息SCI；
    所述处理器，用于根据所述第一SCI，启动第一定时器；所述第一定时器的运行时间用于所述通信装置监测第二SCI和/或侧行链路的数据传输的信息。
  24. 根据权利要求23所述的通信装置，其特征在于，所述收发器，用于接收来自第一发端设备的第一SCI，具体包括：
    在第二定时器的运行时间内，接收来自所述第一发端设备的所述第一SCI；所述第二 定时器的运行时间用于所述通信装置监测侧行链路的控制信息和/或数据传输的信息。
  25. 根据权利要求23或24所述的通信装置，其特征在于，所述处理器，用于根据所述第一SCI，启动第一定时器，具体包括：
    若确定所述第一SCI指示的侧行链路的传输是新的传输，则启动所述第一定时器。
  26. 根据权利要求23至25任一项所述的通信装置，其特征在于，所述处理器，用于根据所述第一SCI，启动第一定时器，具体包括：若所述第一SCI指示侧行链路的传输为新的传输，则启动所述第一定时器；
    或者，若所述第一SCI指示侧行链路的传输不为新的传输，且对于所述通信装置所述侧行链路的传输为新的传输，则启动所述第一定时器。
  27. 根据权利要求23至26任一项所述的通信装置，其特征在于，所述处理器，还用于：基于所述第一SCI指示的至少一个传输资源确定所述第一定时器的运行时间；
    其中，所述第一定时器的运行时间至少与承载所述第二SCI的时域资源重叠。
  28. 根据权利要求27所述的通信装置，其特征在于，
    所述第一定时器的运行时间至少包括第(F-1)个资源预留周期中的首个传输资源中承载所述第二SCI的时域资源；
    其中，第F个资源预留周期中的首个传输资源中承载所述第二SCI的时域资源与第二定时器的运行时间重叠，且第(F-1)个资源预留周期中的首个传输资源中承载所述第二SCI的时域资源与第二定时器的运行时间不重叠；所述F为正整数；所述第二定时器的运行时间用于所述通信装置监测侧行链路的控制信息和/或数据传输的信息。
  29. 根据权利要求28所述的通信装置，其特征在于，
    所述第F个资源预留周期中的首个承载所述第二SCI的时域资源与所述第二定时器的第二非连续接收DRX周期的运行时间重叠；
    其中，所述第二DRX周期是第一DRX周期之后的DRX周期；所述第一DRX周期是所述第一SCI的接收时刻对应的所述第二定时器所在的周期。
  30. 根据权利要求27至29任一项所述的通信装置，其特征在于，
    所述第一定时器的运行时间与第二目标周期中的第一传输资源中承载所述第二SCI的时域资源重叠；
    其中，所述第二目标周期为第一目标周期之后的资源预留周期；所述第一目标周期是接收所述第一SCI的资源预留周期；所述第一SCI指示的至少一个传输资源包括所述第一传输资源。
  31. 根据权利要求30所述的通信装置，其特征在于，
    所述第一目标周期的第一传输资源早于接收所述第一SCI的传输资源；
    或者，所述第一目标周期的第一传输资源是所述第一SCI所属的传输资源。
  32. 根据权利要求30或31所述的通信装置，其特征在于，
    所述第一目标周期的第一传输资源是所述第一SCI所属的传输资源；
    若所述第一SCI指示的至少一个传输资源还包括第二传输资源，且所述第一传输资源和所述第二传输资源位于同一资源预留周期中，所述第一传输资源早于所述第二传输资源，则所述第一定时器的运行时间还与以下至少一项的时域资源重叠：
    所述第一目标周期中的第二传输资源中承载所述第二SCI的时域资源；
    所述第二目标周期中的第二传输资源中承载所述第二SCI的时域资源。
  33. 根据权利要求27至32任一项所述的通信装置，其特征在于，所述处理器，用于基于所述第一SCI指示的至少一个传输资源确定所述第一定时器的运行时间，具体包括：若在当前时刻所在资源预留周期之后的资源预留周期中，承载所述第二SCI的时域资源中存在未与第二定时器的运行时间重叠的时域资源，则基于所述第一SCI指示的至少一个传输资源确定所述第一定时器的运行时间；所述第二定时器的运行时间用于所述通信装置监测侧行链路的控制信息和/或数据传输的信息。
  34. 根据权利要求27至33任一项所述的通信装置，其特征在于，所述第一定时器的运行时间为连续或非连续的。
  35. 根据权利要求34所述的通信装置，其特征在于，
    若所述第一SCI指示的资源预留周期小于或等于第一阈值，则所述第一定时器的运行时间为连续的或非连续的；
    若所述第一SCI指示的资源预留周期大于或等于第二阈值，则所述第一定时器的运行时间为非连续的；
    其中，所述第一阈值小于所述第二阈值。
  36. 根据权利要求23至35任一项所述的通信装置，其特征在于，
    所述收发器，还用于接收来自第二发端设备的第三SCI；
    所述处理器，还用于启动与所述第三SCI对应的第一定时器；
    所述处理器，用于根据所述第一SCI，启动第一定时器，具体包括：启动与所述第一SCI对应的第一定时器；所述第一SCI对应的第一定时器的运行时间包括第一运行时间和第二运行时间的并集；所述第一运行时间至少与所述第一SCI指示的至少一个传输资源上承载所述第二SCI的时域资源重叠；所述第二运行时间至少与所述第三SCI指示的至少一个传输资源上承载SCI的时域资源重叠。
  37. 根据权利要求23至36任一项所述的通信装置，其特征在于，
    所述第一SCI为两级SCI中的第一级SCI；
    或，所述第一SCI为两级SCI中的第二级SCI；
    或，所述第一SCI为两级SCI中的第一级SCI和第二级SCI。
  38. 一种通信装置，其特征在于，包括处理器和收发器，其中：
    所述处理器，用于确定k个第一传输资源，其中，所述k个第一传输资源中承载第一侧行链路控制信息SCI的时域资源与第二定时器的运行时间重叠；所述k为正整数，且k≥1；所述k个第一传输资源是所述通信装置预留的传输资源；所述第二定时器的运行时间用于所述通信装置监测侧行链路的控制信息和/或数据传输的信息；
    所述收发器，用于在所述k个第一传输资源上向收端设备发送所述第一SCI。
  39. 根据权利要求38所述的通信装置，其特征在于，所述k个第一传输资源是K个第一传输资源中前k个第一传输资源；所述K个第一传输资源是所述通信装置预留的传输资源；所述K为正整数。
  40. 根据权利要求38或39所述的通信装置，其特征在于，所述k为预定义的参数；
    或者，所述收发器，还用于接收来自网络设备的第二配置信息；所述第二配置信息指示所述k的取值。
  41. 根据权利要求38至40任一项所述的通信装置，其特征在于，所述处理器，用于确定k个第一传输资源，具体包括：
    检测第二传输资源的信号强度；所述第二传输资源与预设定时器的运行时间重叠；
    根据所述第二传输资源的信号强度，确定至少K个第一传输资源；
    根据所述至少K个第一传输资源与所述第二定时器的运行时间重叠状况，从所述至少K个第一传输资源中确定所述k个第一传输资源。
  42. 根据权利要求41所述的通信装置，其特征在于，
    所述预设定时器包括以下定时器中的至少一项：
    第一定时器；所述第一定时器的运行时间用于所述通信装置监测侧行链路的控制信息和/或数据传输的信息；
    所述第二定时器；
    重传定时器。
  43. 根据权利要求38至42任一项所述的通信装置，其特征在于，
    所述k个第一传输资源为一个资源预留周期中的传输资源。
  44. 根据权利要求38至43任一项所述的通信装置，其特征在于，
    所述第一SCI为两级SCI中的第一级SCI，
    或，所述第一SCI为两级SCI中的第二级SCI，
    或，所述第一SCI为两级SCI中的第一级SCI和第二级SCI。
  45. 一种通信装置，其特征在于，包括：用于执行权利要求1至15任一项所述的通信方法中各个步骤的单元，或用于执行权利要求16至22任一项所述的通信方法中各个步骤的单元。
  46. 一种通信装置，其特征在于，包括：处理器，用于调用存储器中的程序，以执行权利要求1至15任一项所述的通信方法，或用于执行权利要求16至22任一项所述的通信方法。
  47. 一种通信装置，其特征在于，包括：处理器和接口电路，所述接口电路用于与其它装置通信，所述处理器用于执行权利要求1至15任一项所述的通信方法，或所述处理器用于执行权利要求16至22任一项所述的通信方法。
  48. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储程序，所述程序被处理器调用时，权利要求1至22任一项所述的通信方法被执行。
  49. 一种计算机程序，其特征在于，当所述程序被处理器调用时，权利要求1至22任一项所述的通信方法被执行。
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