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CN104469961A - Device-to-device communication method, device and system - Google Patents

Device-to-device communication method, device and system Download PDF

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Publication number
CN104469961A
CN104469961A CN201310443341.1A CN201310443341A CN104469961A CN 104469961 A CN104469961 A CN 104469961A CN 201310443341 A CN201310443341 A CN 201310443341A CN 104469961 A CN104469961 A CN 104469961A
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China
Prior art keywords
communication
control information
communication data
information
channel
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CN201310443341.1A
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Chinese (zh)
Inventor
吴栓栓
梁枫
袁弋非
陈琳
杨瑾
袁明
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ZTE Corp
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ZTE Corp
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Priority to CN201310443341.1A priority Critical patent/CN104469961A/en
Priority to PCT/CN2014/084814 priority patent/WO2015043341A1/en
Publication of CN104469961A publication Critical patent/CN104469961A/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a device-to-device (D2D) communication method, device and system. A second device sends a dispatching request for D2D communication to a first device, and D2D communication data transmission is carried out based on the dispatching of the second device; the first device responds to the dispatching request and sends control information to dispatch the second device to carry out D2D communication data transmission; a third device detects the control information sent by the first device and receives the D2D communication data sent by the second device based on the control information. By means of the device-to-device communication method, device and system, the communication problem among the devices is solved, and compatibility of device-to-device communication and cellular communication are guaranteed; in addition, the device-to-device communication method, device and system can be suitable for device-to-device communication with a unicasting or broadcasting or multicasting mode or other broadcasting modes.

Description

Device-to-device communication method, device and system
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a device-to-device communication method, device, and system.
Background
In a cellular communication system, when there is service transmission between two User Equipments (UEs), for example, service data from UE1 to UE2 is first transmitted over an air interface to a Base Station (Base Station, NodeB for short or evolved NodeB) of a cell in which UE1 is located, the Base Station transmits the service data to a Base Station of a cell in which UE2 is located through a core network, and the Base Station of a cell in which UE2 is located transmits the service data over the air interface to UE 2. Similar processing flows are adopted for traffic data transmission from UE2 to UE 1. As shown in fig. 1a, when the UE1 and the UE2 are located in the same cell, although the two UEs are covered by the cell of the same base station, data transmission still needs to be relayed through the core network, and one data transmission still consumes two radio spectrum resources.
It follows that the above-described cellular communication method is clearly not optimal if the UE1 and the UE2 are located in the same cell and are close together. In fact, with diversification of mobile communication services, for example, popularization of applications such as social networks, electronic payments, etc. in wireless communication systems, service transmission demands among close-range users are increasing. Thus, Device-to-Device (D2D) communication modes are of increasing interest. As shown in fig. 1b, D2D indicates that the Service data is directly transmitted to the target user equipment over the air interface by the source user equipment without being forwarded by the base station and the core network, which may also be referred to as Proximity Service (ProSe). For users of short-range communication, D2D not only saves wireless spectrum resources, but also reduces data transmission pressure of the core network.
In D2D Communication, the receiving end of D2D service data may be a single UE or multiple UEs, that is, D2D Communication may be Unicast (single) Communication, Broadcast (Broadcast) Communication, Multicast (Group host or Group Communication), or Multicast (Multicast) Communication. In consideration of the D2D communication scheme, the support for the communication mode needs to be considered, which is also a technical problem to be solved at present.
Disclosure of Invention
In view of the above, the main object of the present invention is to provide a device-to-device communication method, device and system, so as to solve the problem of device-to-device communication.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a device-to-device D2D communication method, applied to a second device, the method comprising:
transmitting a scheduling request to the first device, the scheduling request requesting scheduling of the D2D communication;
receiving control information from the first device, the control information for scheduling transmission of D2D communication data;
and sending D2D communication data to the third device according to the control information.
Preferably, the control information has a specific identifier, and the specific identifier is used for marking a D2D radio bearer or a D2D service or a sending device of the D2D communication data;
and when there are multiple sets of control information, multiplexing the multiple sets of control information at a higher layer, wherein each set of control information is used for scheduling of each D2D radio bearer or D2D service or the transmitting device of D2D communication data, and the specific identifier of different sets of control information is different.
Preferably, the control information is a radio resource control message and is mapped to a physical downlink shared channel for transmission;
and the physical downlink control channel for indicating the physical downlink shared channel is transmitted in a public retrieval space or a special retrieval space, wherein the cyclic redundancy check bit of the physical downlink control channel is scrambled by a special wireless network temporary identifier.
Preferably, the control information includes at least one of the following parameters:
allocation information of time domain resources for the D2D communication;
allocation information of frequency domain resources for the D2D communication;
the modulation and coding mode of the D2D communication data;
a timing advance for the D2D communication;
power control parameters for the D2D communication.
Preferably, the sending D2D communication data to the third device according to the control information includes:
and determining the start of a radio frame and/or a subframe for transmitting the D2D communication data according to the start of the corresponding downlink radio frame and the timing advance, and transmitting the radio frame and/or the subframe according to the start.
Preferably, before the receiving the control information from the first device, the method further comprises:
receiving D2D configuration information sent by the first device, where the configuration information at least includes a control channel resource configuration parameter, and the configuration parameter is used to indicate a time domain and/or frequency domain radio resource location of the control information transmission.
Preferably, the scheduling request is a physical layer signaling and is sent through a dedicated physical uplink control channel, where the dedicated physical uplink control channel is a channel dedicated to D2D communication control information transmission; or,
the scheduling request is a high-level signaling and is sent in a form of a radio resource control message or a medium access control message.
A device-to-device D2D communication method, applied to a first device, the method comprising:
receiving a scheduling request, the scheduling request being sent by a second device, the scheduling request requesting scheduling of D2D communication;
in response to the scheduling request, sending control information to the second device, the control information for scheduling transmission of D2D communication data.
Preferably, the control information has a specific identifier, and the specific identifier is used for marking a D2D radio bearer or a D2D service or a sending device of the D2D communication data;
and when there are multiple groups of control information, multiplexing the multiple groups of control information at a higher layer, wherein each group of control information is used for scheduling of each D2D radio bearer or D2D service or the D2D communication data transmitting device, and the specific identifiers of different groups of control information are different.
Preferably, the control information is a radio resource control message and is mapped to a physical downlink shared channel for transmission;
and the physical downlink control channel for indicating the physical downlink shared channel is transmitted in a public retrieval space or a special retrieval space, wherein the cyclic redundancy check bit of the physical downlink control channel is scrambled by a special wireless network temporary identifier.
Preferably, the control information includes at least one of the following parameters:
time domain resource allocation information for the D2D communication;
frequency domain resource allocation information for the D2D communication;
the modulation and coding mode of the D2D communication data;
a timing advance for the D2D communication;
power control parameters for the D2D communication.
Preferably, before the sending of the control information to the second device, the method further includes:
sending D2D configuration information;
the configuration information at least comprises a control channel resource configuration parameter, and the configuration parameter is used for indicating the time domain and/or frequency domain radio resource position of the control information transmission; or, the configuration information at least includes a D2D channel configuration parameter, and the D2D channel configuration parameter is used to indicate at least one of the following:
time domain and/or frequency domain radio resource location of D2D communication data transmission;
the modulation and coding mode of D2D communication data transmission;
a timing advance for the D2D communication.
A device-to-device D2D communication method, applied to a third device, the method comprising:
detecting a physical downlink control channel which is sent by first equipment and marked by a special wireless network temporary identifier;
receiving a physical downlink shared channel sent by the first device according to the indication of the physical downlink control channel, where the physical downlink shared channel is used for transmitting control information, and the control information is a radio resource control message and is used for scheduling D2D communication;
and receiving the D2D communication data sent by the second device according to the control information.
Preferably, the control information has a specific identifier, and the specific identifier is used for marking a D2D radio bearer or a D2D service or a sending device of the D2D communication data;
and when there are multiple sets of control information, multiplexing the multiple sets of control information at a higher layer, wherein each set of control information is used for scheduling of each D2D radio bearer or D2D service or the transmitting device of D2D communication data, and the specific identifier of different sets of control information is different.
Preferably, the control information includes at least one of the following parameters:
time domain resource allocation information for the D2D communication;
frequency domain resource allocation information for the D2D communication;
the modulation and coding mode of the D2D communication data;
a timing advance for the D2D communication;
power control parameters for the D2D communication.
Preferably, the receiving, according to the control information, the D2D communication data sent by the second device includes:
and determining the start of a radio frame and/or a subframe for receiving the D2D communication data according to the start of the corresponding downlink radio frame and the timing advance, and receiving the radio frame and/or the subframe according to the start.
Preferably, before detecting the physical downlink control channel, the method further includes:
receiving D2D configuration information sent by the first device, where the configuration information at least includes a control channel resource configuration parameter, and the configuration parameter is used to indicate a time domain and/or frequency domain radio resource location of the control information transmission.
A device-to-device D2D communication method, applied to a third device, the method comprising:
detecting D2D configuration information sent by a first device, wherein the configuration information at least comprises channel configuration parameters of D2D communication, and the channel configuration parameters are used for indicating at least one of the following: time domain and/or frequency domain radio resource location of D2D communication data transmission; modulation and coding scheme of D2D communication data, timing advance for performing the D2D communication;
and receiving the D2D communication data sent by the second device according to the configuration information.
Preferably, the receiving, according to the control information, the D2D communication data sent by the second device includes:
and determining the start of a radio frame and/or a subframe for receiving the D2D communication data according to the start of the corresponding downlink radio frame and the timing advance, and receiving the radio frame and/or the subframe according to the start.
A second device, comprising:
the first communication module is used for communicating with the first equipment, and comprises a scheduling request sending module, a scheduling request receiving module and a control information receiving module, wherein the scheduling request sending module is used for sending a scheduling request to the first equipment; wherein the scheduling request is for requesting scheduling of D2D communication, and the control information is for scheduling transmission of D2D communication data;
and the second communication module is connected with the first communication module, is used for communicating with a third device, and comprises a step of sending D2D communication data to the third device according to the control information received from the first device.
Preferably, the control information has a specific identifier, and the specific identifier is used for marking a D2D radio bearer or a D2D service or a sending device of the D2D communication data;
and when there are multiple sets of control information, multiplexing the multiple sets of control information at a higher layer, wherein each set of control information is used for scheduling of each D2D radio bearer or D2D service or the transmitting device of D2D communication data, and the specific identifier of different sets of control information is different.
Preferably, the control information is a radio resource control message and is mapped to a physical downlink shared channel for transmission; and the physical downlink control channel for indicating the physical downlink shared channel is transmitted in a public retrieval space or a special retrieval space, wherein the cyclic redundancy check bit of the physical downlink control channel is scrambled by a special wireless network temporary identifier.
Preferably, the first communication module is further configured to receive, before receiving control information from a first device, D2D configuration information sent by the first device, where the configuration information includes at least a control channel resource configuration parameter, and the configuration parameter is used to indicate a time domain and/or frequency domain radio resource location of transmission of the control information.
A first device, comprising:
the third communication module is used for receiving a scheduling request sent by second equipment and responding to the scheduling request and sending control information to the second equipment; wherein the scheduling request is for requesting scheduling of the D2D communication, and the control information is for scheduling transmission of the D2D communication data.
Preferably, the third communication module is further configured to send D2D configuration information before sending control information to the second device;
the configuration information at least comprises a control channel resource configuration parameter, and the configuration parameter is used for indicating the time domain and/or frequency domain radio resource position of the control information transmission; or, the configuration information at least includes a D2D channel configuration parameter, and the D2D channel configuration parameter is used to indicate at least one of the following:
time domain and/or frequency domain radio resource location of D2D communication data transmission;
the modulation and coding mode of D2D communication data transmission;
a timing advance for the D2D communication.
A third device, comprising:
a fourth communication module for communicating with a first device, comprising: detecting a physical downlink control channel marked by a special wireless network temporary identifier and sent by a first device, and receiving a physical downlink shared channel sent by the first device according to an indication of the physical downlink control channel, wherein the physical downlink shared channel is used for transmitting control information, and the control information is a radio resource control message and is used for scheduling D2D communication;
and the fifth communication module is used for communicating with the second device and receiving the D2D communication data sent by the second device according to the control information.
Preferably, the control information includes at least one of the following parameters:
time domain resource allocation information for the D2D communication;
frequency domain resource allocation information for the D2D communication;
the modulation and coding mode of the D2D communication data;
a timing advance for the D2D communication;
power control parameters for the D2D communication.
Preferably, the fifth communication module is further configured to determine a start of a radio frame and/or a subframe for receiving the D2D communication data according to a start of a corresponding downlink radio frame and the timing advance, and receive the radio frame and/or the subframe according to the start.
Preferably, the fourth communication module is further configured to receive, before detecting the physical downlink control channel, D2D configuration information sent by the first device, where the configuration information at least includes a control channel resource configuration parameter, and the configuration parameter is used to indicate a time domain and/or a frequency domain radio resource location of the control information transmission.
A third device, comprising:
a sixth communication module, configured to communicate with the first device, including detecting D2D configuration information sent by the first device, where the configuration information includes at least a channel configuration parameter of D2D communication, and the channel configuration parameter is used to indicate at least one of: time domain and/or frequency domain radio resource location of D2D communication data transmission; modulation and coding scheme of D2D communication data, timing advance for performing the D2D communication;
and the seventh communication module is used for communicating with the second device and receiving the D2D communication data sent by the second device according to the configuration information.
Preferably, the seventh communication module is further configured to determine a start of a radio frame and/or a subframe for receiving the D2D communication data according to a start of a corresponding downlink radio frame and the timing advance, and receive the radio frame and/or the subframe according to the start.
A device-to-device D2D communication system includes the aforementioned first device, second device, and third device.
The device-to-device communication method, the device and the system solve the problem of device-to-device communication and ensure the compatibility of device-to-device communication and cellular communication; moreover, the embodiment of the invention can be simultaneously suitable for device-to-device communication in multicast modes such as unicast, broadcast, multicast and the like, and the unified scheme is beneficial to the simplification of a system and the reduction of the complexity of device realization.
Drawings
FIG. 1a is a diagram illustrating cellular communications of UEs located in the same cell of a base station in the related art;
fig. 1b is a schematic diagram illustrating D2D communication of UEs located in the same base station cell in the related art;
fig. 2 is a diagram illustrating a radio resource structure in the related art;
fig. 3 is a first flowchart of a D2D communication method according to an embodiment of the present invention;
fig. 4 is a second flowchart of a D2D communication method according to an embodiment of the present invention;
fig. 5 is a flowchart three of a D2D communication method according to an embodiment of the present invention;
fig. 6 is a fourth flowchart of a D2D communication method according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a second apparatus according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a first apparatus according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a third apparatus according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention is further elaborated below with reference to the drawings and the specific embodiments.
The embodiment of the invention is suitable for a cellular wireless communication system or network, and is also suitable for a scene that cellular network facilities are lacked or damaged, namely the user equipment cannot be accessed to the cellular network or cannot be connected with the cellular network.
A common cellular wireless communication system may be based on a Code Division Multiple Access (CDMA) technology, a Frequency Division Multiple Access (FDMA) technology, an Orthogonal Frequency Division Multiple Access (OFDMA) technology, a Single Carrier-FDMA (SC-FDMA) technology, or the like. For example, the downlink (or referred to as the forward link) of a 3GPP (3 rd Generation Partnership Project) Long Term Evolution (LTE)/Long term evolution-Advanced (LTE-a) cellular communication system is based on OFDMA technology and the uplink (or referred to as the reverse link) is based on SC-FDMA multiple access technology. It is possible in the future to support hybrid multiple access techniques on one link.
In the OFDMA/SC-FDMA system, a Radio Resource (Radio Resource) for communication is a two-dimensional form of time-frequency. For example, for the LTE/LTE-a system, the communication resources of the uplink and downlink are divided in the time direction by radio frame (radio frame), each radio frame (radio frame) has a length of 10ms, and includes 10 subframes (sub-frames) with a length of 1ms, and each subframe includes two slots (slots) with a length of 0.5 ms. And each slot may include 6 or 7 OFDM or SC-FDM symbols depending on a configuration of a Cyclic Prefix (CP).
In the frequency direction, resources are divided in units of subcarriers (subcarriers), and specifically, in communication, the minimum unit of frequency domain Resource allocation is a Resource Block (RB) corresponding to one Physical Resource Block (PRB) of Physical resources. One PRB includes 12 sub-carriers in the frequency domain, corresponding to one slot (slot) in the time domain. The Resource corresponding to one subcarrier on each OFDM/SC-FDM symbol is called a Resource Element (RE). As shown in fig. 2.
In LTE/LTE-a cellular communication, Uplink and Downlink traffic data are respectively in a Shared Channel (Shared Channel) and a Physical Uplink Shared Channel (PUSCH) and a Physical Downlink Shared Channel (PDSCH) in a Physical layer. Data transmission in both the PUSCH and the PDSCH requires scheduling of Control information, and the Control information is carried in a Physical Downlink Control Channel (PDCCH) or an Enhanced PDCCH (EPDCCH); the time-frequency resource position of the PDCCH is fixed, the specific size is indicated by a Physical Control Format Indicator Channel (PCFICH), and the time-frequency resource position of the EPDCCH is indicated by a Radio Resource Control (RRC) message.
The D2D communication method provided in the embodiment of the present invention is applied to a second device, and as shown in fig. 3, the method includes:
step 301, sending a scheduling request to the first device, where the scheduling request is used to request scheduling of the D2D communication service.
The scheduling request can be sent by a physical layer signaling through a dedicated physical uplink control channel, wherein the dedicated means that the physical uplink control channel is specially used for transmitting the communication control information from the equipment to the equipment; alternatively, the scheduling request is a higher layer signaling and is transmitted in the form of a radio resource control message or a medium access control message.
Step 302, receiving control information from the first device, the control information being used for scheduling transmission of D2D communication data.
Preferably, the control information has a specific identifier, and the specific identifier is used for marking a D2D radio bearer or a D2D service or a sending device of the D2D communication data;
and when there are multiple sets of control information, multiplexing the multiple sets of control information at a higher layer, wherein each set of control information is used for scheduling of each D2D radio bearer or D2D service or the transmitting device of D2D communication data, and the specific identifier of different sets of control information is different. The higher layer refers to a protocol layer above a physical layer (PHY) in an access network protocol stack, such as a MAC layer, or an RRC layer. The following description is similar and will not be repeated.
Preferably, the control information is a radio resource control message and is mapped to the PDSCH for transmission; the control information for indicating the PDSCH may be carried in a Downlink Control Information (DCI) format, the DCI being transmitted in the PDCCH or EPDCCH, and Cyclic Redundancy Check (CRC) bits thereof being scrambled by a dedicated Radio Network Temporary Identifier (RNTI). Dedicated refers to its exclusive use for device-to-device communication, or for a group of user equipments for a particular device-to-device communication, or for a particular device-to-device communication service. The special RNTI can be determined in a promissory manner, for example, the value of the special RNTI is promissed among devices; alternatively, the value of the dedicated RNTI may also be configured by the first device, for example, the first device configures and indicates the value of the dedicated RNTI through signaling.
The control information is transmitted in the PDSCH, that is, the control information is finally mapped to be transmitted in a physical downlink shared channel, and this may include channel mapping between protocol layers, for example, a logical channel carrying the control information is mapped to a transport channel, and the transport channel is further mapped to the PDSCH. The logical channel here may be a D2D dedicated control channel (D2D control channel) for communication control information. The following description is similar and will not be repeated.
Preferably, the specific identification of the control information is used to distinguish different device-to-device Radio bearers (Radio bearers) or device-to-device communication services or transmitting devices of D2D communication. For example, the identifier may be a Logical Channel Identifier (LCID), or a device identifier, or a service identifier, or other identification information, or a combination thereof. Alternatively, the specific identifier may be a parameter included in the control information. The identification may be a contract or obtained from the first device. When the specific identifier of the control information detected by the user equipment is associated with the user equipment or the specific service or radio bearer of the user equipment, the user equipment sends the equipment-to-equipment service data according to the indication of the control information.
Preferably, the control information includes at least one of the following parameters:
allocation information of time domain resources for the D2D communication;
allocation information of frequency domain resources for the D2D communication;
modulation and Coding Scheme (MCS) of the D2D communication data;
a timing advance for the D2D communication;
power control parameters for the D2D communication.
Step 303, sending D2D communication data to the third device according to the control information.
The sending D2D communication data to the third device according to the control information includes:
determining the start of a radio frame and/or a subframe for transmitting the device-to-device communication data according to the start of the corresponding downlink radio frame, and transmitting the radio frame and/or the subframe according to the start;
or determining the start of a radio frame and/or a subframe for transmitting the D2D communication data according to the start of a corresponding downlink radio frame and the timing advance of the transmitting equipment, and transmitting the radio frame and/or the subframe according to the start;
or, determining the start of a radio frame and/or a subframe for transmitting the device-to-device communication data according to the start of the corresponding downlink radio frame and the timing advance indicated in the control information, and transmitting the radio frame and/or the subframe according to the start.
Preferably, before the receiving the control information from the first device, the method further comprises: receiving D2D configuration information sent by the first device, where the configuration information at least includes a control channel resource configuration parameter, and the configuration parameter is used to indicate a time domain and/or frequency domain radio resource location of the control information transmission. The D2D configuration information may be included in an RRC message and transmitted in a broadcast form.
It should be noted that the first device according to the embodiment of the present invention may be a network device providing an access function. In a cellular wireless communication system, a network device providing an access function is generally called a base station (or called device B or NodeB), or an evolved Node B (eNB), or an enhanced Node B (eNB)). The base station referred to herein also includes Low Power devices (LPN, Low Power Node) in the network, such as a femto cell or a Home base station (pico, Relay, femto, HeNB, Home eNB, etc.). The first device may also be a network device temporarily deployed for D2D communication management, for example when an access network is broken. The first device may also be a User Equipment (UE), e.g. in case of certain specific scenarios such as access network failure. The second device is a service sending end UE of D2D communication, and the third device is a service receiving end UE of D2D communication.
An embodiment of the present invention further provides a communication method of D2D, which is applied to a first device, and as shown in fig. 4, the method includes:
step 401, receiving a scheduling request, where the scheduling request is sent by a second device, and the scheduling request is used for requesting scheduling of D2D communication.
The control information has a specific identification used for marking a D2D radio bearer or D2D service or a sending device of the D2D communication data;
and when there are multiple groups of control information, multiplexing the multiple groups of control information at a higher layer, wherein each group of control information is used for scheduling of each D2D radio bearer or D2D service or the D2D communication data transmitting device, and the specific identifiers of different groups of control information are different.
Step 402, in response to the scheduling request, sending control information to the second device, the control information being used for scheduling transmission of D2D communication data.
The control information is a radio resource control message and is mapped in a physical downlink shared channel for transmission; and the physical downlink control channel for indicating the physical downlink shared channel is transmitted in a public retrieval space or a special retrieval space, wherein the cyclic redundancy check bit of the physical downlink control channel is scrambled by a special wireless network temporary identifier.
The control information includes at least one of the following parameters:
time domain resource allocation information for the D2D communication;
frequency domain resource allocation information for the D2D communication;
the modulation and coding mode of the D2D communication data;
a timing advance for the D2D communication;
power control parameters for the D2D communication.
Preferably, before the sending of the control information to the second device, the method further includes:
sending D2D configuration information;
the configuration information at least comprises a control channel resource configuration parameter, and the configuration parameter is used for indicating the time domain and/or frequency domain radio resource position of the control information transmission; or, the configuration information at least includes a D2D channel configuration parameter, and the D2D channel configuration parameter is used to indicate at least one of the following:
time domain and/or frequency domain radio resource location of D2D communication data transmission;
the modulation and coding mode of D2D communication data transmission;
a timing advance of the D2D communication.
The D2D configuration information may be included in an RRC message and transmitted in a broadcast form.
An embodiment of the present invention further provides a communication method of D2D, which is applied to a third device, and as shown in fig. 5, the method includes:
step 501, detecting a physical downlink control channel marked by a private radio network temporary identifier sent by a first device.
The control information has a specific identification used for marking a D2D radio bearer or D2D service or a sending device of the D2D communication data;
and when there are multiple sets of control information, multiplexing the multiple sets of control information at a higher layer, wherein each set of control information is used for scheduling of each D2D radio bearer or D2D service or the transmitting device of D2D communication data, and the specific identifier of different sets of control information is different.
Step 502, receiving a physical downlink shared channel sent by the first device according to the indication of the physical downlink control channel, where the physical downlink shared channel is used to transmit control information, and the control information is a radio resource control message and is used to schedule D2D communication.
The control information includes at least one of the following parameters:
time domain resource allocation information for the D2D communication;
frequency domain resource allocation information for the D2D communication;
the modulation and coding mode of the D2D communication data;
a timing advance for the D2D communication;
power control parameters for the D2D communication.
And step 503, receiving the D2D communication data sent by the second device according to the control information.
The receiving, according to the control information, the D2D communication data sent by the second device includes:
determining the start of a radio frame and/or a subframe for receiving the device-to-device communication data according to the start of the corresponding downlink radio frame, and receiving the radio frame and/or the subframe according to the start;
or determining the start of a radio frame and/or a subframe for receiving the D2D communication data according to the start of a corresponding downlink radio frame and the timing advance of the sending equipment, and receiving the radio frame and/or the subframe according to the start;
or determining the start of a radio frame and/or a subframe for receiving the device-to-device communication data according to the start of the corresponding downlink radio frame and the timing advance indicated in the control information, and receiving the radio frame and/or the subframe according to the start.
Preferably, before detecting the physical downlink control channel, the method further includes: receiving D2D configuration information sent by the first device, where the configuration information at least includes a control channel resource configuration parameter, and the configuration parameter is used to indicate a time domain and/or frequency domain radio resource location of the control information transmission. Correspondingly, the third device detects the pdcch at the time domain and/or frequency domain radio resource location of the control information transmission.
An embodiment of the present invention further provides a communication method of D2D, which is applied to a third device, and as shown in fig. 6, the method includes:
step 601, detecting D2D configuration information sent by the first device, where the configuration information at least includes a channel configuration parameter of D2D communication, and the channel configuration parameter is used to indicate at least one of the following: time domain and/or frequency domain radio resource location of D2D communication data transmission; the modulation and coding scheme of the D2D communication data and the timing advance of the D2D communication are carried out.
Step 602, receiving D2D communication data sent by the second device according to the configuration information.
The receiving, according to the control information, the D2D communication data sent by the second device includes:
determining the start of a radio frame and/or a subframe for receiving the device-to-device communication data according to the start of the corresponding downlink radio frame, and receiving the radio frame and/or the subframe according to the start;
or determining the start of a radio frame and/or a subframe for receiving the D2D communication data according to the start of a corresponding downlink radio frame and the timing advance of the sending equipment, and receiving the radio frame and/or the subframe according to the start;
or determining the start of a radio frame and/or a subframe for receiving the device-to-device communication data according to the start of the corresponding downlink radio frame and the timing advance indicated in the control information, and receiving the radio frame and/or the subframe according to the start.
It should be particularly noted that, in the foregoing embodiment of the present invention, the scheduling request sent by the second device may be physical layer signaling. The physical layer signaling is sent to the first device over the PUCCH. For example, the scheduling request is transmitted through a dedicated PUCCH resource, where dedicated refers to the PUCCH resource being dedicated to transmission of the scheduling request related to D2D communication, and a part of the PUCCH resources for cellular communication may be reserved as the dedicated PUCCH resource, or a dedicated PUCCH resource different from the PUCCH resource for cellular communication may be configured for D2D communication.
The scheduling request sent by the second device may also be a higher layer signaling, for example, an RRC message carried in a dedicated control channel; the first device schedules the second device to transmit D2D data according to the scheduling request.
The second device requesting D2D scheduling may also be a multi-step interactive process. For example, the second device sends a scheduling request of the physical layer to the first device, and thereafter requests scheduling of the D2D communication to the first device through higher layer signaling.
The first device transmitting control information to schedule the second device to transmit D2D communication data; the control information is also used to instruct the third device to receive D2D communication data. The control information may be transmitted in the PDSCH, i.e., the control information is carried by one data packet included in the PDSCH. Before this there may be a channel mapping process between different protocol layers, for example: the control information is RRC message, which is carried in a logical channel D2D control channel, the D2D control channel is mapped to a downlink shared channel or D2D channel, and the downlink shared channel or D2D channel is mapped to a physical downlink shared channel.
When a plurality of simultaneously scheduled second devices or D2D traffic or D2D radio bearers each correspond to one set of control information, and the plurality of sets of control information are multiplexed and transmitted, the multiplexing may be performed at a higher layer, for example, a MAC layer or an upper layer. Wherein, each group of control information has a specific identifier, and the specific identifier is used for distinguishing different D2D radio bearers or different D2D communication services or different D2D communication senders; the second device identifies itself or its specific service or control information corresponding to the radio bearer according to the specific identifier, and performs D2D communication transmission according to the scheduling of the control information. The identifier may be a Logical Channel Identifier (LCID), or a device identifier, or a service identifier, or other identification information, or a combination of part or all of the above identifiers. Alternatively, the specific identifier may be a parameter included in the control information. The identification may be a contract or obtained from the first device.
Each set of control information includes at least one of the following parameters: time domain resource allocation information of a D2D communication service, frequency domain resource allocation information of a D2D communication service, Modulation and Coding Scheme (MCS) for transmitting the D2D communication service, timing advance for transmitting the D2D communication service, and power control parameters for transmitting the D2D communication service.
The time domain resource allocation information indicates a time domain resource location for the second device to transmit D2D traffic data, for example, may indicate a subframe location of a specific transmission. The subframe position indicated here may be an uplink subframe. For example, the time domain resource allocation information allocates periodic time domain radio resources for the second device to transmit D2D communication data. As such, the allocation information may include a parameter for indicating a period, a parameter for indicating an offset, and a parameter indicating a specific subframe position. The parameter for indicating the period is configured with a period in a unit of 10ms or a radio frame, the parameter for indicating the offset is used for indicating a radio frame position including a D2D communication service transmission resource in the period, and the specific subframe position indicates a subframe position used for transmitting a D2D communication service in the radio frame position.
Alternatively, the allocation information may include a parameter indicating a period, a parameter indicating a specific subframe position. The parameter for indicating the period configures the period in units of 10ms or a radio frame, and the parameter for indicating the specific subframe position indicates the specific subframe position for D2D communication service transmission in the period.
Wherein the frequency domain resource allocation information indicates a frequency domain resource location for the second device to device traffic data transmission, the frequency domain resource indicated herein may be located in the subframe for D2D communication data transmission described above. For example, the frequency domain resource allocation information allocates the frequency domain resource blocks for D2D service transmission in the resource allocation method of the LTE system, which is the type0/type1/type2 resource allocation method defined in the LTE specification.
Or, the frequency domain resource allocation information allocates a frequency domain subchannel for device-to-device service transmission. For example, for the available resources of D2D, the sub-channels may be divided in the frequency domain, and the frequency domain resource allocation information indicates the number or index of the sub-channels scheduled for device-to-device traffic transmission. The sub-channels may be divided according to the following principle: the physical resource block of the channel division is used as the minimum unit, namely 12 subcarriers in the frequency domain; frequency domain bandwidth M of sub-channelRBSatisfy the requirement ofWherein N isRBThe bandwidth available for the frequency domain, e.g., when the uplink band is used for D2D communication, is the number of RBs of the uplink band, α2、α3And alpha5Is a non-negative integer. In accordance with the above principles, the subchannels may be divided into different bandwidth sizes of 1, 2, 3, 4, 5, 6, 10 RBs, etc. The size of the sub-channel bandwidth can be fixed or can vary with the size of the system bandwidth, and the larger the bandwidth, the larger the sub-channel bandwidth. Indicating the subchannel number or index means that the subchannel corresponds to a number or index, and the assigned subchannel is determined by the indicated number or index. The frequency domain subchannels may also be indicated by a bitmap, each bit of which represents a subchannel.
Wherein the modulation coding scheme indicates the MCS level for D2D data transmission. The MCS defined by the LTE system may be followed or alternatively, the MCS communicated by D2D may be defined as a subset of the MCS level set defined by the LTE system.
Wherein the timing advance indicates a timing adjustment when the D2D traffic data is transmitted and/or received. When the control information includes the parameter, the timing advance may be agreed to be the same as the uplink timing advance of the D2D service data, that is, the second device, or may be different from the uplink timing advance, and the timing advance is determined by the first device.
Wherein the power control parameter is used for performing power control on the transmission of the D2D traffic data. The power control mode can follow the power control mode of the PUSCH of the LTE system.
The first device may send D2D configuration information including at least control channel resource configuration parameters.
The configuration parameters may include parameters indicating the time domain and/or frequency domain radio resource location of the control information transmission. For example, the parameter indicates a subframe of a control information transmission described herein. The first device and the second device may receive the configuration parameter before detecting the control information, and detect the control information in a subframe indicated by the configuration parameter. This helps to save power for the user equipment. The time domain radio resource may be configured periodically.
The configuration parameters may include RNTI indication information, which indicates the dedicated RNTI used in the aforementioned detection control information.
The device-to-device communication configuration information may be included in an RRC message and transmitted in a broadcast manner.
Corresponding to the communication method of D2D, an embodiment of the present invention further provides a second device, as shown in fig. 7, including:
a first communication module 10, configured to communicate with a first device, including sending a scheduling request to the first device and receiving control information from the first device; wherein the scheduling request is for requesting scheduling of D2D communication, and the control information is for scheduling transmission of D2D communication data;
and the second communication module 20 is connected with the first communication module 10, is used for communicating with a third device, and comprises a step of sending D2D communication data to the third device according to the control information received from the first device.
Wherein the control information has a specific identifier for marking a D2D radio bearer or D2D traffic or a transmitting device of the D2D communication data;
and when there are multiple sets of control information, multiplexing the multiple sets of control information at a higher layer, wherein each set of control information is used for scheduling of each D2D radio bearer or D2D service or the transmitting device of D2D communication data, and the specific identifier of different sets of control information is different.
The control information is a radio resource control message and is mapped in a physical downlink shared channel for transmission; and the physical downlink control channel for indicating the physical downlink shared channel is transmitted in a public retrieval space or a special retrieval space, wherein the cyclic redundancy check bit of the physical downlink control channel is scrambled by a special wireless network temporary identifier.
The first communication module 10 is further configured to, before receiving control information from a first device, receive D2D configuration information sent by the first device, where the configuration information includes at least a control channel resource configuration parameter, and the configuration parameter is used to indicate a time domain and/or frequency domain radio resource location of transmission of the control information.
An embodiment of the present invention further provides a first device, including: the third communication module is used for receiving a scheduling request sent by second equipment and responding to the scheduling request and sending control information to the second equipment; wherein the scheduling request is for requesting scheduling of the D2D communication, and the control information is for scheduling transmission of the D2D communication data.
Preferably, the third communication module is further configured to send D2D configuration information before sending control information to the second device;
the configuration information at least comprises a control channel resource configuration parameter, and the configuration parameter is used for indicating the time domain and/or frequency domain radio resource position of the control information transmission; or, the configuration information at least includes a D2D channel configuration parameter, and the D2D channel configuration parameter is used to indicate at least one of the following:
time domain and/or frequency domain radio resource location of D2D communication data transmission;
the modulation and coding mode of D2D communication data transmission;
a timing advance for the D2D communication.
An embodiment of the present invention further provides a third device, as shown in fig. 8, including:
a fourth communication module 40, configured to communicate with a first device, including: detecting a physical downlink control channel marked by a special wireless network temporary identifier and sent by a first device, and receiving a physical downlink shared channel sent by the first device according to an indication of the physical downlink control channel, wherein the physical downlink shared channel is used for transmitting control information, and the control information is a radio resource control message and is used for scheduling D2D communication service data;
and a fifth communication module 50, configured to communicate with the second device, including receiving, according to the control information, D2D communication data sent by the second device.
The control information includes at least one of the following parameters:
time domain resource allocation information for the D2D communication;
frequency domain resource allocation information for the D2D communication;
the modulation and coding mode of the D2D communication data;
a timing advance for the D2D communication;
power control parameters for the D2D communication.
The fifth communication module 50 is further configured to determine a start of a radio frame and/or a subframe for receiving the D2D communication data according to the start of the corresponding downlink radio frame and the timing advance, and receive the radio frame and/or the subframe according to the start.
The fourth communication module 40 is further configured to receive, before detecting the physical downlink control channel, D2D configuration information sent by the first device, where the configuration information at least includes a control channel resource configuration parameter, and the configuration parameter is used to indicate a time domain and/or a frequency domain radio resource location for transmission of the control information.
An embodiment of the present invention further provides a third device, as shown in fig. 9, including:
a sixth communication module 60, configured to communicate with the first device, including detecting D2D configuration information sent by the first device, where the configuration information includes at least a channel configuration parameter of D2D communication, and the channel configuration parameter is used to indicate at least one of: time domain and/or frequency domain radio resource location of D2D communication data transmission; modulation and coding scheme of D2D communication data, timing advance for performing the D2D communication;
a seventh communication module 70, configured to communicate with the second device, including receiving, according to the configuration information, D2D communication data sent by the second device.
Preferably, the seventh communication module 70 is further configured to determine a start of a radio frame and/or a subframe for receiving the D2D communication data according to the start of the corresponding downlink radio frame and the timing advance, and receive the radio frame and/or the subframe according to the start.
The embodiment of the invention also provides a communication system of D2D, which includes the first device, the second device and the third device.
By the embodiment of the invention, the problem of communication between equipment and equipment is solved, and the compatibility between the equipment-to-equipment communication and cellular communication is ensured; moreover, the embodiment of the invention can be simultaneously suitable for device-to-device communication in multicast modes such as unicast, broadcast, multicast and the like, and the unified scheme is beneficial to the simplification of a system and the reduction of the complexity of device realization. In addition, the embodiment of the invention is also easy to be applied to the scene without network coverage.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims (32)

1. A device-to-device D2D communication method, applied to a second device, the method comprising:
transmitting a scheduling request to the first device, the scheduling request requesting scheduling of the D2D communication;
receiving control information from the first device, the control information for scheduling transmission of D2D communication data;
and sending D2D communication data to the third device according to the control information.
2. The communication method according to the D2D, wherein the control information has a specific identifier for marking the transmitting device of the D2D radio bearer or D2D traffic or the D2D communication data;
and when there are multiple sets of control information, multiplexing the multiple sets of control information at a higher layer, wherein each set of control information is used for scheduling of each D2D radio bearer or D2D service or the transmitting device of D2D communication data, and the specific identifier of different sets of control information is different.
3. The communication method of D2D according to claim 1 or 2,
the control information is a radio resource control message and is mapped in a physical downlink shared channel for transmission;
and the physical downlink control channel for indicating the physical downlink shared channel is transmitted in a public retrieval space or a special retrieval space, wherein the cyclic redundancy check bit of the physical downlink control channel is scrambled by a special wireless network temporary identifier.
4. The communication method of D2D according to claim 1 or 2, wherein the control information includes at least one of the following parameters:
allocation information of time domain resources for the D2D communication;
allocation information of frequency domain resources for the D2D communication;
the modulation and coding mode of the D2D communication data;
a timing advance for the D2D communication;
power control parameters for the D2D communication.
5. The communication method of D2D, according to claim 4, wherein the sending D2D communication data to the third device according to the control information includes:
and determining the start of a radio frame and/or a subframe for transmitting the D2D communication data according to the start of the corresponding downlink radio frame and the timing advance, and transmitting the radio frame and/or the subframe according to the start.
6. A communication method according to D2D, according to claim 1 or 2, wherein before said receiving the control information from the first device, the method further comprises:
receiving D2D configuration information sent by the first device, where the configuration information at least includes a control channel resource configuration parameter, and the configuration parameter is used to indicate a time domain and/or frequency domain radio resource location of the control information transmission.
7. The communication method of D2D according to claim 1 or 2,
the scheduling request is a physical layer signaling and is sent through a dedicated physical uplink control channel, wherein the dedicated physical uplink control channel is a channel dedicated to D2D communication control information transmission; or,
the scheduling request is a high-level signaling and is sent in a form of a radio resource control message or a medium access control message.
8. A device-to-device D2D communication method, the method being applied to a first device, the method comprising:
receiving a scheduling request, the scheduling request being sent by a second device, the scheduling request requesting scheduling of D2D communication;
in response to the scheduling request, sending control information to the second device, the control information for scheduling transmission of D2D communication data.
9. The communication method according to the D2D, wherein the control information has a specific identifier for marking the sending device of the D2D radio bearer or D2D traffic or the D2D communication data;
and when there are multiple groups of control information, multiplexing the multiple groups of control information at a higher layer, wherein each group of control information is used for scheduling of each D2D radio bearer or D2D service or the D2D communication data transmitting device, and the specific identifiers of different groups of control information are different.
10. The communication method of D2D according to claim 8 or 9,
the control information is a radio resource control message and is mapped in a physical downlink shared channel for transmission;
and the physical downlink control channel for indicating the physical downlink shared channel is transmitted in a public retrieval space or a special retrieval space, wherein the cyclic redundancy check bit of the physical downlink control channel is scrambled by a special wireless network temporary identifier.
11. The communication method according to D2D, wherein the control information includes at least one of the following parameters:
time domain resource allocation information for the D2D communication;
frequency domain resource allocation information for the D2D communication;
the modulation and coding mode of the D2D communication data;
a timing advance for the D2D communication;
power control parameters for the D2D communication.
12. The communication method of D2D according to claim 8 or 9, wherein before the sending the control information to the second device, the method further comprises:
sending D2D configuration information;
the configuration information at least comprises a control channel resource configuration parameter, and the configuration parameter is used for indicating the time domain and/or frequency domain radio resource position of the control information transmission; or, the configuration information at least includes a D2D channel configuration parameter, and the D2D channel configuration parameter is used to indicate at least one of the following:
time domain and/or frequency domain radio resource location of D2D communication data transmission;
the modulation and coding mode of D2D communication data transmission;
a timing advance for the D2D communication.
13. A device-to-device D2D communication method, the method being applied to a third device, the method comprising:
detecting a physical downlink control channel which is sent by first equipment and marked by a special wireless network temporary identifier;
receiving a physical downlink shared channel sent by the first device according to the indication of the physical downlink control channel, where the physical downlink shared channel is used for transmitting control information, and the control information is a radio resource control message and is used for scheduling D2D communication;
and receiving the D2D communication data sent by the second device according to the control information.
14. The communication method according to the D2D, wherein the control information has a specific identifier for marking the sending device of the D2D radio bearer or D2D traffic or the D2D communication data;
and when there are multiple sets of control information, multiplexing the multiple sets of control information at a higher layer, wherein each set of control information is used for scheduling of each D2D radio bearer or D2D service or the transmitting device of D2D communication data, and the specific identifier of different sets of control information is different.
15. The communication method according to D2D, wherein the control information includes at least one of the following parameters:
time domain resource allocation information for the D2D communication;
frequency domain resource allocation information for the D2D communication;
the modulation and coding mode of the D2D communication data;
a timing advance for the D2D communication;
power control parameters for the D2D communication.
16. The D2D communication method according to claim 15, wherein the receiving D2D communication data transmitted by the second device according to the control information comprises:
and determining the start of a radio frame and/or a subframe for receiving the D2D communication data according to the start of the corresponding downlink radio frame and the timing advance, and receiving the radio frame and/or the subframe according to the start.
17. The method of D2D communication according to claim 13 or 14, wherein before the detecting the physical downlink control channel, the method further comprises:
receiving D2D configuration information sent by the first device, where the configuration information at least includes a control channel resource configuration parameter, and the configuration parameter is used to indicate a time domain and/or frequency domain radio resource location of the control information transmission.
18. A device-to-device D2D communication method, the method being applied to a third device, the method comprising:
detecting D2D configuration information sent by a first device, wherein the configuration information at least comprises channel configuration parameters of D2D communication, and the channel configuration parameters are used for indicating at least one of the following: time domain and/or frequency domain radio resource location of D2D communication data transmission; modulation and coding scheme of D2D communication data, timing advance for performing the D2D communication;
and receiving the D2D communication data sent by the second device according to the configuration information.
19. The D2D communication method according to claim 18, wherein the receiving D2D communication data transmitted by the second device according to the control information comprises:
and determining the start of a radio frame and/or a subframe for receiving the D2D communication data according to the start of the corresponding downlink radio frame and the timing advance, and receiving the radio frame and/or the subframe according to the start.
20. A second apparatus, comprising:
the first communication module is used for communicating with the first equipment, and comprises a scheduling request sending module, a scheduling request receiving module and a control information receiving module, wherein the scheduling request sending module is used for sending a scheduling request to the first equipment; wherein the scheduling request is for requesting scheduling of D2D communication, and the control information is for scheduling transmission of D2D communication data;
and the second communication module is connected with the first communication module, is used for communicating with a third device, and comprises a step of sending D2D communication data to the third device according to the control information received from the first device.
21. The second device of claim 20, wherein the control information has a specific identifier, and wherein the specific identifier is used for marking a D2D radio bearer or D2D traffic or a sending device of the D2D communication data;
and when there are multiple sets of control information, multiplexing the multiple sets of control information at a higher layer, wherein each set of control information is used for scheduling of each D2D radio bearer or D2D service or the transmitting device of D2D communication data, and the specific identifier of different sets of control information is different.
22. The second device according to claim 20 or 21, wherein the control information is a radio resource control message and is mapped to a physical downlink shared channel for transmission; and the physical downlink control channel for indicating the physical downlink shared channel is transmitted in a public retrieval space or a special retrieval space, wherein the cyclic redundancy check bit of the physical downlink control channel is scrambled by a special wireless network temporary identifier.
23. The second device according to claim 20 or 21, wherein the first communication module is further configured to, before receiving the control information from the first device, receive D2D configuration information sent by the first device, where the configuration information at least includes a control channel resource configuration parameter, and the configuration parameter is used to indicate a time domain and/or frequency domain radio resource location of the control information transmission.
24. A first device, comprising:
the third communication module is used for receiving a scheduling request sent by second equipment and responding to the scheduling request and sending control information to the second equipment; wherein the scheduling request is for requesting scheduling of the D2D communication, and the control information is for scheduling transmission of the D2D communication data.
25. The first device of claim 24, wherein the third communication module is further configured to send D2D configuration information prior to sending control information to the second device;
the configuration information at least comprises a control channel resource configuration parameter, and the configuration parameter is used for indicating the time domain and/or frequency domain radio resource position of the control information transmission; or, the configuration information at least includes a D2D channel configuration parameter, and the D2D channel configuration parameter is used to indicate at least one of the following:
time domain and/or frequency domain radio resource location of D2D communication data transmission;
the modulation and coding mode of D2D communication data transmission;
a timing advance for the D2D communication.
26. A third apparatus, comprising:
a fourth communication module for communicating with a first device, comprising: detecting a physical downlink control channel marked by a special wireless network temporary identifier and sent by a first device, and receiving a physical downlink shared channel sent by the first device according to an indication of the physical downlink control channel, wherein the physical downlink shared channel is used for transmitting control information, and the control information is a radio resource control message and is used for scheduling D2D communication;
and the fifth communication module is used for communicating with the second device and receiving the D2D communication data sent by the second device according to the control information.
27. The third device of claim 26, wherein the control information comprises at least one of the following parameters:
time domain resource allocation information for the D2D communication;
frequency domain resource allocation information for the D2D communication;
the modulation and coding mode of the D2D communication data;
a timing advance for the D2D communication;
power control parameters for the D2D communication.
28. The third device of claim 27, wherein the fifth communication module is further configured to determine a start of a radio frame and/or a subframe for receiving the D2D communication data according to the start of a corresponding downlink radio frame and the timing advance, and to receive the radio frame and/or subframe according to the start.
29. The third device according to claim 26, 27 or 28, wherein the fourth communication module is further configured to, before detecting the physical downlink control channel, receive D2D configuration information sent by the first device, where the configuration information at least includes a control channel resource configuration parameter, and the configuration parameter is used to indicate a time domain and/or frequency domain radio resource location of the control information transmission.
30. A third apparatus, comprising:
a sixth communication module, configured to communicate with the first device, including detecting D2D configuration information sent by the first device, where the configuration information includes at least a channel configuration parameter of D2D communication, and the channel configuration parameter is used to indicate at least one of: time domain and/or frequency domain radio resource location of D2D communication data transmission; modulation and coding scheme of D2D communication data, timing advance for performing the D2D communication;
and the seventh communication module is used for communicating with the second device and receiving the D2D communication data sent by the second device according to the configuration information.
31. The third device of claim 30, wherein the seventh communication module is further configured to determine a start of a radio frame and/or a subframe for receiving the D2D communication data according to the start of the corresponding downlink radio frame and the timing advance, and to receive the radio frame and/or subframe according to the start.
32. A device-to-device D2D communication system, characterized in that it comprises a first device according to any of claims 24-25, a second device according to any of claims 20-23, and a third device according to any of claims 26-29.
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