CN114258717B

CN114258717B - System and method for using resources in through link communications

Info

Publication number: CN114258717B
Application number: CN201980099201.2A
Authority: CN
Inventors: 罗薇; 陈琳
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2019-08-09
Filing date: 2019-08-09
Publication date: 2025-07-25
Anticipated expiration: 2039-08-09
Also published as: CN114258717A; WO2021026681A1

Abstract

The present invention discloses a system and method for using resources in direct link communication. In one embodiment, the system and method include: determining by a direct link communication device in a direct link communication device group whether resources have been previously allocated to the direct link communication device; and continuing to use the resources by the direct link communication device based on the running state of a timer.

Description

System and method for using resources in through link communications

Technical Field

The present invention relates to wireless communications, and more particularly, to systems and methods for using resources in direct link (sidelink) communications.

Background

A direct link (SL) communication is a radio communication directly between two or more user equipment devices (hereinafter "UEs"). In this type of communication, two or more UEs that are geographically close to each other may communicate directly without passing through an eNodeB or a base station (hereinafter referred to as "BS") or a core network. Thus, data transmission in through-link communication is different from typical cellular network communication that transmits data to or receives data from a BS (i.e., uplink transmission). In direct link communications, data is sent directly from a source UE to a target UE over a unified air interface (e.g., PC5 interface) without going through a base station.

Disclosure of Invention

The disclosed exemplary embodiments are directed to solving problems associated with one or more problems existing in the prior art, and to providing additional features that will become apparent upon reference to the following detailed description when taken in conjunction with the accompanying drawings. According to various embodiments, example systems, methods, apparatus, and computer program products are disclosed. However, it should be understood that these embodiments are presented by way of example and not limitation, and that various modifications of the disclosed embodiments may be made while remaining within the scope of the disclosure, as will be apparent to those of ordinary skill in the art from reading the disclosure.

In one embodiment, a method performed by a pass-through link communication device includes determining, by one of a group of pass-through link communication devices, whether the resource is a previously allocated resource for the pass-through link communication device, and continuing to use the resource by the pass-through link communication device based on an operational state of a timer.

In some embodiments, the timer comprises at least one of a T310 timer or a T311 timer. In some embodiments, the method further includes determining that the T310 timer or the T311 timer is running, determining whether a cell in which the through link communication device detects a physical layer problem or a radio link failure transmits a message including information allowing continued use of the resource, and continuing to use the resource based on the determination.

In one embodiment, a method performed by a pass-through link communication device includes receiving, by one of a group of pass-through link communication devices from a wireless communication node, a message indicating a timer and a constant value associated with the timer, determining, by the pass-through link communication device, whether the timer has timed out based on the constant value, and responsive to the determination, resources allocated to the pass-through link communication device before the pass-through link communication device ceases use.

In some embodiments, the method further comprises starting a timer when a physical layer problem is detected and stopping the timer when at least one of receiving N311 consecutive synchronization indications from a lower layer for a particular cell, receiving an RRC reconfiguration message carrying reconfigurationWithSync messages for the group of cells, or initiating a connection reestablishment procedure, the timer times out.

In one embodiment, a method performed by a pass-through link communication device includes receiving, by one of a group of pass-through link communication devices from a wireless communication node, a message indicating a resource threshold or a time threshold, determining, by the pass-through link communication device, whether the wireless communication device is not transmitting data on the resource threshold number of consecutive resources or is not transmitting data on the time threshold number of consecutive times, and ceasing, by the pass-through link communication device, use of a previously allocated resource for the wireless communication device in response to the determination.

In one embodiment, a method performed by a pass-through link communication device includes receiving, by one of a group of pass-through link communication devices, a message from a wireless communication node via an RRC message or system information, continuing, by the pass-through link communication device, resources previously allocated to the pass-through link communication device based on a determination of whether a first condition indicated in the message is met, and ceasing, by the pass-through link communication device, resources previously allocated to the pass-through link communication device based on a determination of whether a second condition indicated in the message is met.

In some embodiments, the first condition includes at least one of whether the through link communication device enters an RRC idle state, whether DATAINACTIVITYTIMER times out, or whether a higher layer indicates to release the RRC connection.

In some implementations, the second condition includes at least one of whether the through link communication device is not transmitting data on the resource threshold number of consecutive resources or is not transmitting data on the time threshold number of consecutive times, whether a timer indicated in the message times out, or whether the through link communication device reselects to a cell different from a cell to which the through link communication device was previously connected.

In one embodiment, a method performed by a pass-through link communication device includes determining, by a first one of a group of pass-through link communication devices, a wireless link state between a first pass-through link communication device and a second one of the group of pass-through link communication devices, and transmitting, by the first pass-through link communication device, a signal representative of the wireless link state between the first pass-through link communication device and the second pass-through link communication device to a wireless communication node.

In one embodiment, a method performed by a pass-through link communication device includes one of a group of pass-through link communication devices receiving a message from a wireless communication node. The message indicates the resource and further indicates a data type, a logical channel type, or a logical channel group type allocated for the resource. The method also includes the pass-through link communication device transmitting data using the resources based on the data type, the logical channel type, or the logical channel group type.

In some embodiments, the message is received via downlink control information or RRC message.

In one embodiment, a method performed by a cut-through link communication device includes one of a set of cut-through link communication devices receiving a message from a wireless communication node, the message indicating an initial transmission of a first Medium Access Control (MAC) Packet Data Unit (PDU), the resource allocated for retransmission of a second MAC PDU being allowed to be used when a condition is met, the method including transmitting, by a wireless communication device, data based on the indicated message using the resource.

In some embodiments, the condition is that the first mac pdu includes data belonging to at least one of a quality of service (QoS) list, a Logical Channel Identifier (LCID) list, or a Logical Channel Group Identifier (LCGID) list.

The above and other aspects and implementations thereof are described in more detail in the accompanying drawings, description and claims.

Drawings

Various exemplary embodiments of the present solution are described in detail below with reference to the following figures or drawings. The drawings are provided for illustrative purposes only and merely describe exemplary embodiments of the present solution to facilitate the reader's understanding of the present solution. Accordingly, the drawings should not be taken as limiting the breadth, scope, or applicability of the present solution. It should be noted that for clarity and ease of illustration, the drawings are not necessarily drawn to scale.

Fig. 1A shows an example of a wireless communication network according to an embodiment of the present invention.

Fig. 1B illustrates a block diagram of an exemplary wireless communication system for transmitting and receiving downlink, uplink, and/or through-link communication signals in accordance with an embodiment of the present invention.

Fig. 2 is a flow chart illustrating an example process for using resources in a pass-through link communication according to an embodiment of the invention.

Fig. 3 is a flow chart illustrating an exemplary process for using resources in a pass-through link communication in accordance with an embodiment of the present invention.

Fig. 4 is a flow chart illustrating an exemplary process for using resources in a pass-through link communication in accordance with an embodiment of the invention.

Fig. 5 is a flow chart illustrating an exemplary process of using resources in a pass-through link communication in accordance with an embodiment of the present invention.

Fig. 6 is a flow chart illustrating an exemplary process of using resources in a pass-through link communication in accordance with an embodiment of the present invention.

Fig. 7 is a flow chart illustrating an example process of using resources in a pass-through link communication according to an embodiment of the invention.

Fig. 8 is a flow chart illustrating an exemplary process of using resources in a pass-through link communication according to an embodiment of the invention.

Detailed Description

Various exemplary embodiments of the present scheme are described below with reference to the drawings to enable one of ordinary skill in the art to make and use the scheme. As will be apparent to those of ordinary skill in the art after reading this disclosure, various changes or modifications may be made to the examples described herein without departing from the scope of the present solution. Thus, the present solution is not limited to the exemplary embodiments and applications described and illustrated herein. Furthermore, the particular order or hierarchy of steps in the methods disclosed in the present schemes is exemplary only. Based on design preferences, the specific order or hierarchy of steps in the methods or processes disclosed may be rearranged while remaining within the scope of the present disclosure. Thus, those of ordinary skill in the art will understand that the methods and techniques disclosed herein present different steps or acts in an example order, and that the present approach is not limited to the particular order or hierarchy presented, unless explicitly stated otherwise.

A. network environment and computing environment

Referring to fig. 1A, an exemplary wireless communication network 100 is shown. The wireless communication network 100 illustrates group communications within a cellular network. In a wireless communication system, a network-side communication node or Base Station (BS) may include a next-generation node B (gNB), an E-UTRAN node B (also referred to as an evolved node B, eNodeB or eNB), a pico station, a femto station, a transmission/reception point (TRP), an Access Point (AP), and the like. The terminal-side node or User Equipment (UE) may include a long-range communication system, such as a mobile device, a smart phone, a Personal Digital Assistant (PDA), a tablet computer, a laptop computer, or a short-range communication system, such as a wearable device, a vehicle with a vehicle communication system, or the like. In fig. 1A, network-side and terminal-side communication nodes are represented by BS102 and UE104a or 104b, respectively, and are hereinafter embodiments of the present invention. In some embodiments, the BS102 and UEs 104a/104b are sometimes referred to as "wireless communication nodes" and "wireless communication devices," respectively. Such communication nodes/devices may perform wireless and/or wired communication.

In the embodiment shown in FIG. 1A, BS102 may define a cell 101 in which UEs 104a-b are located. The UE104a may include a vehicle that moves within the coverage of the cell 101.UE104a may communicate with BS102 via communication channel 103 a. Similarly, UE104b may communicate with BS102 via communication channel 103 b. Further, the UEs 104a-b may communicate with each other via a communication channel 105. The communication channels (e.g., 103 a-b) between the UE and the BS may be over, for example, the Uu interface, which is also referred to as the UMTS (universal mobile telecommunications system) air interface. The communication channel (e.g., 105) between UEs may be through a PC5 interface that is introduced to address high mobile speed and high density applications, such as vehicle-to-vehicle (V2V) communication, vehicle-to-vehicle (V2P) communication, vehicle-to-infrastructure (V2I) communication, vehicle-to-network (V2N) communication, and so forth. In some cases, such automotive network communication modes may be collectively referred to as vehicle-to-everything (V2X) communication. It should be appreciated that the communication channel between UEs may be used for device-to-device (D2D) communication while remaining within the scope of the present invention. BS102 is connected to a Core Network (CN) 108 through an external interface 107 (e.g., iu interface).

Fig. 1B illustrates a block diagram of an exemplary wireless communication system 150 for transmitting and receiving downlink, uplink, and pass-through link communication signals in accordance with an embodiment of the present invention. The system 150 may include components and elements for supporting known or conventional operating features that need not be described in detail herein. As described above, in one embodiment, the system 150 may transmit and receive data symbols in a wireless communication environment, such as the wireless communication network 100 of fig. 1A.

As depicted in fig. 1A, system 150 generally includes BS102 and UEs 104a-b. BS102 includes BS transceiver module 110, BS antenna 112, BS memory module 116, BS processor module 114, and network communication module 118, each of which is coupled and interconnected to each other as necessary via data communication bus 120. The UE104a includes a UE transceiver module 130a, a UE antenna 132a, a UE memory module 134a, and a UE processor module 136a, each coupled and interconnected with each other as necessary via a data communication bus 140 a. Similarly, UE104b includes a UE transceiver module 130b, a UE antenna 132b, a UE memory module 134b, and a UE processor module 136b, each coupled and interconnected to each other as needed via a data communication bus 140 b. BS102 communicates with UEs 104a-b via one or more communication channels 150, the communication channels 150 may be any wireless channel or other medium known in the art suitable for data transmission as described herein.

As will be appreciated by one of ordinary skill in the art, the system 150 may further include any number of modules in addition to the modules shown in fig. 1B. Those of skill in the art will appreciate that the various illustrative functional blocks, modules, circuits, and processing logic described in connection with the embodiments disclosed herein may be implemented as hardware, computer readable software, firmware, or any practical combination thereof. To clearly illustrate this interchangeability and compatibility of hardware, firmware, and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware, firmware, or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement such functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as limiting the scope of the present invention.

The wireless transmission from the antennas in the UEs 104a-b to the antennas in the BS102 is referred to as an uplink transmission and the wireless transmission from the antennas in the BS102 to the antennas in the UEs 104a-b is referred to as a downlink transmission. According to some embodiments, each of the UE transceiver modules 130a-b may be referred to herein as an uplink transceiver or UE transceiver. The uplink transceiver may include transmitter and receiver circuitry, each coupled to a respective antenna 132a-b. Alternatively, the duplex switch may couple the uplink transmitter or receiver to the uplink antenna in a time duplex manner. Similarly, BS transceiver module 110 may be referred to herein as a downlink transceiver or BS transceiver. The downlink transceiver may include RF transmitter and receiver circuitry each coupled to an antenna 112. The downlink duplex switch selectively couples a downlink transmitter or receiver to the antenna 112 in a time duplex manner. The operation of transceivers 110 and 130a-b are coordinated in time such that the uplink receiver is coupled to antennas 132a-b for receiving transmissions over wireless communication channel 150 while the downlink transmitter is coupled to antenna 112. In some embodiments, the UEs 104a-b may communicate with the BS102 via the wireless communication channel 150 using the UE transceivers 130a-b through respective antennas 132a-b. The wireless communication channel 150 may be any wireless channel or other medium known in the art suitable for Downlink (DL) and/or Uplink (UL) transmission of data as described in the present invention. The UEs 104a-b may communicate with each other via a wireless communication channel 170. The wireless communication channel 170 may be any wireless channel or other medium known in the art suitable for through-link transmission of data as described in the present invention.

The UE transceivers 130a-b each communicate with the BS transceiver 110 via a wireless data communication channel 150 by configuration and cooperate with an appropriately configured antenna arrangement that may support a particular wireless communication protocol and modulation scheme. In some embodiments, the UE transceivers 130a-b and BS transceiver 110 are configured to support industry standards, such as Long Term Evolution (LTE) and emerging 5G standards, and the like. However, it should be understood that the present invention is not limited to the application of a particular standard and associated protocol. In contrast, the UE transceivers 130a-b and BS transceiver 110 may be used to support alternative or extended wireless data communication protocols, including future standards or variations thereof.

The processor modules 136a-b and 114 may each be implemented with a general purpose processor, a content addressable memory, a digital signal processor, an application specific integrated circuit, a field programmable gate array, any suitable programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described herein. In this manner, the processor may be implemented as a microprocessor, controller, microcontroller, state machine, or the like. A processor may also be implemented as a combination of computing devices, e.g., a combination of a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other such configuration.

Furthermore, the steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in firmware, in a software module executed by the processor modules 114 and 136a-b, respectively, or in any practical combination thereof. Memory modules 116 and 134a-b may be implemented as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. In this regard, the memory modules 116 and 134a-b may be coupled to the processor modules 114 and 136a-b, respectively, such that the processor modules 114 and 136a-b may read information from the memory modules 116 and 134a-b, respectively, and write information to the memory modules 116 and 134a-b, respectively. The memory modules 116 and 134a-b may also be integrated into their respective processor modules 114 and 136 a-b. In some implementations, the memory modules 116 and 134a-b may each include a cache memory for storing temporary variables or other intermediate information during execution of instructions to be executed by the processor modules 114 and 136a-b, respectively. Memory modules 116 and 134a-b may also each include non-volatile memory for storing instructions that are executed by processor modules 114 and 136a-b, respectively.

Network interface 118 generally represents the hardware, software, firmware, processing logic, and/or other components of BS102 that enable bi-directional communication between BS transceiver 110 and other network components and communication nodes configured to communicate with BS 102. For example, the network interface 118 may be configured to support Internet or WiMAX services. In a typical deployment, the network interface 118 provides an 802.3 Ethernet interface so that the BS transceiver 110 can communicate with a conventional Ethernet-based computer network. In this manner, the network interface 118 may comprise a physical interface for connecting to a computer network, such as a Mobile Switching Center (MSC). The term "configured to" as used herein with respect to a specified operation or function refers to a device, component, circuit, structure, machine, signal, etc. that is physically constructed, programmed, formatted and/or arranged to perform the specified operation or function. Network interface 118 may allow BS102 to communicate with other BSs or core networks via wired or wireless connections.

In some embodiments, each of the UEs 104a-b may operate in a hybrid communication network in which the UEs communicate with the BS102 and with other UEs, e.g., between 104a and 104 b. As described in more detail below, UEs 104a-b support through-link communications with other UEs and downlink/uplink communications between BS102 and UEs 104 a-b. In general, the direct link communication allows the UEs 104a-b to establish direct communication links with each other or with other UEs from different cells without the BS102 relaying data between the UEs.

B. Through link (SideLink) communications

For V2X ues, to reduce latency and efficiently utilize resources, a BS (e.g., BS 102) may allocate configured grant resources for the pass-through link V2X. When the radio link of the UE fails, the continuous use of the resource may cause resource conflict, and the use of the resource is stopped, which results in low resource utilization. Therefore, the invention provides a technical scheme for solving the problem.

A through link is a unidirectional communication (e.g., direct communication) service between two terminals (e.g., UE104a and UE104 b). Vehicle networking refers to a large system network that enables wireless communication and information exchange between vehicles and vehicles, vehicles and pedestrians, vehicles and roadside equipment, vehicles and the internet, in accordance with agreed communication protocols and data interaction standards. The communication through the internet of vehicles enables vehicles to achieve driving safety, improves traffic efficiency, and accesses convenience or entertainment information. Depending on the classification of wireless communication objects, there are three different types of automotive Network communication, inter-Vehicle communication (V2V), communication between vehicles and roadside equipment/Network Infrastructure (V2I/V2N for short), and communication between vehicles and pedestrian-To-PEDESTRIAN (V2P for short), collectively referred To as V2X communication.

As shown in fig. 1, the V2X communication method is one of implementation modes of the V2X standard, i.e., traffic data is directly transmitted by a source UE (e.g., 104 a) to a target UE (e.g., 104 b) through an air interface (e.g., channel 105) without being forwarded through a base station BS or a core network. The V2X communication method is called V2X communication or V2X through link communication based on PC 5.

With technological advances and the development of automation industry, V2X communication scenarios are further extended and have higher performance requirements. Advanced V2X services are mainly divided into 4 general categories, vehicle team (vehicle platooning), extension sensor (extended sensors), advanced driving (semi-automated driving, full automated driving (semi-automated or full-automated driving)) and remote driving (remote driving). The performance requirements to be met are 50 to 12000 bytes for packet size, 2 to 50 messages per second for transmission rate, 3-500 milliseconds for maximum end-to-end delay, 90% -99.999% reliability, 0.5-1000Mbps for data rate, and 50-1000 meters for transmission range. The 3GPP has set aside internet of vehicles communication research based on the fifth generation mobile communication technology (5G,5th Generation), including internet of vehicles communication based on 5G air interfaces and internet of vehicles communication based on 5G direct links (sidelink). The invention provides a resource allocation scheme based on a 5G straight-through link

For systems and methods that do not utilize embodiments of the present application, the assigned through link (SL) semi-persistent scheduling (SPS) or configured grant resources may not be used after a Radio Link Failure (RLF) occurs at the terminal or after the terminal enters a Radio Resource Control (RRC) idle state. However, in some cases of the present application, the UE may continue to use the SL configured grant resources. The application provides a scheme for continuously using the configured SL resources and releasing the resources after meeting the RLF or RRC idle state, thereby reducing the probability of resource collision, reducing the transmission delay and improving the resource utilization rate.

The problem to be solved is how to negotiate between the UE and the BS to ensure that the BS does not allocate resources to other UEs when the configured grant resources are used by the UE. After the UE releases the resources, the BS may obtain information about the release and reallocate the resources. In addition, for the UE, the RRC reestablishment procedure is initiated after RLF occurs. If the reselected cell is the original cell, it is reasonable to continue to configure the grant resources using the previously configured PC5, but if the re-established cell is a new cell, the UE may have left the coverage of the original cell. In this case, it is not appropriate to continue to use the resources configured by the original cell. Thus, if the reselected cell is a new cell, in some embodiments of the invention, the UE stops using the PC5 configuration grant resources of the original cell.

Even if the reselected cell is a new cell, in some embodiments of the invention, the UE continues to use PC5 to configure the grant resources. Specifically, if the UE configures the configuration grant resources, the UE may configure the grant resources using the PC5 based on the running state of a timer (e.g., T301, T304, T310, T311, or the like). The running state may include a timer being running. In some embodiments, each timer has a start condition for starting operation, a stop condition for stopping operation.

In some embodiments, the starting condition of the T310 timer is that the UE detects a physical layer problem of the primary cell (PCell). N310 consecutive out-of-sync indications are received from a lower layer (e.g., MAC layer). In some embodiments, the stop condition of the T310 timer is that the UE receives N311 consecutive synchronization indications from the lower layer, triggers the handover procedure, and initiates the RRC connection reestablishment procedure. In some embodiments, the starting condition of the T311 timer is that the UE initiates an RRC connection reestablishment procedure. In some embodiments, the stop condition of the T311 timer is that the UE uses another Radio Access Technology (RAT) to select a suitable E-UTRA cell or cell (to which the UE is connected), e.g., to ensure that there is a valid SIB.

In some embodiments, the starting condition of the T301 timer is that the UE sends an RRC connection reestablishment request. In some embodiments, the stop condition of the T301 timer is that the UE receives an RRC connection reestablishment message or an RRC connection reestablishment reject message and when the selected cell becomes unsuitable for some reason.

In some embodiments, during the running of the T301 timer, if the selected target cell is the source cell, the resources may continue to be used until the connection is successfully re-established. In some embodiments, the source cell is the cell to which the UE was connected before RLF occurred or transitioned to the RRC idle state by the UE. In some embodiments, the target cell is the cell on which the UE initiates the re-establishment after RLF occurs. After successful connection re-establishment, the base station may send RRCConnectionReconfiguration a message to indicate whether the UE stopped or updated the configured grant resources. If the selected target cell is a new cell, the UE may stop using the configured grant resources.

In some embodiments, the starting condition of the T304 timer is that the UE receives RRCConnectionReconfiguration messages including mobility control information. In some embodiments, the stop condition of the T304 timer is when the random access on the corresponding SpCell completes successfully.

In some implementations, during T304 timer operation, the new configuration grant resources are used if they are included in mobility control information V2X (e.g., mobilityControlInfoV 2X) in RRCConnectionReconfiguration messages or V2X-InterFreqInfoList for the relevant frequency in RRCConnectionReconfiguration messages. If the configured grant permission indication is included in mobilityControlInfoV X in RRCConnectionReconfiguration or in v2X-InterFreqInfoList for the relevant frequency in RRCConnectionReconfiguration, the UE may continue to use the original configured grant resources.

Fig. 2 is a flow chart of an example flow 200 of using resources in a pass-through link communication according to some embodiments of the invention. In some implementations, the process 200 may be performed by a pass-through link communication device (e.g., UE104a or UE104 b). Additional, fewer, or different operations may be performed in the process 200, depending on the embodiment. The pass-through link communication device determines whether resources were previously allocated for the pass-through link communication device (202). The pass-through link communication device continues to use the resources based on the running state of the timer (204).

In some embodiments, the timer comprises a T310, T311, T301, or T304 timer. In some embodiments, the pass-through link communication device determines the running state of the timer to run. In some implementations, the pass-through link communication device determines whether a cell (e.g., a primary cell) in which the pass-through link communication device detected a physical layer problem or radio link failure has transmitted a message that includes information that allows continued use of resources. In some implementations, the direct link communication device determines whether the cell in which the direct link communication device initiated the reestablishment is the source cell to which the direct link communication device was previously connected. In some implementations, the pass-through link communication device determines RRCConnectionReconfiguration whether the message includes an indication that the use of resources is allowed to continue. In some implementations, the pass-through link communication device continues to use the resources based on one or more determinations (e.g., determining an operational status, determining whether the cell has transmitted a message including an indication that allows continued use of the resources, determining whether the cell is a source cell, determining RRCConnectionReconfiguration whether the message includes an indication that allows continued use of the resources, etc.).

After RLF of the UE to BS (Uu) occurs, if a security function (e.g., AS function) is activated, the UE performs an RRC reestablishment procedure. If the cell selected by the UE is not the source cell, the PC5 configures the grant resources to be disabled. If the reselected cell is the source cell, the configuration of the grant resources may continue using the PC 5. If the re-establishment is successful, the BS may continue to retain the RRC configuration of the UE. In some embodiments, if the reestablishment fails, the UE enters RRCidle (idle) state. After entering the idle state, if the UE performs cell reselection to camp on a new cell, the PC5 configured in the source cell configures the grant resources to be stopped. If the UE is still camping on the source cell, the UE may continue to use PC5 to configure the licensed resources, but further consideration is needed to the information when released and the base station may (e.g., at the same time) inform that the resources have been released.

In some embodiments, the BS configures the first timer and determines the conditions under which the first timer starts and stops. Whether the condition is met may be detected or otherwise determined by the UE. For example, after RLF occurs, the BS can synchronously learn when the UE has RLF occurred. In some embodiments, the first timer is started when the UE sends an RRC reestablishment request. In some embodiments, the first timer stops counting after the reconstruction is successful. In some embodiments, if the rebuild fails, the first timer continues to count until the first timer times out, and the resources cannot be used any more. In some embodiments, the UE periodically transmits feedback information (e.g., a Medium Access Control (MAC) Control Element (CE) or Uplink Control Information (UCI)) and restarts the first timer in a normal RRC connected state. In some embodiments, the base station restarts the first timer when the base station receives the feedback information. In some embodiments, when RLF occurs at the UE, the UE does not send the feedback information, and after the first timer expires, the configuration grant resources are not used.

Fig. 3 is a flow chart illustrating an exemplary process 300 for using resources in a pass-through link communication in accordance with some embodiments of the present disclosure. In some implementations, the process 300 may be performed by a pass-through link communication device (e.g., UE104a or UE104 b). Additional, fewer, or different operations may be performed in the process 300, depending on the embodiment. The pass-through link communication device receives a message from a wireless communication node (e.g., BS 102) indicating a timer and a constant value associated with the timer (302). In some embodiments, the timer counts up or down from an initial predetermined value in response to a start condition.

The pass-through link communication device determines whether the timer has expired based on a constant value (304). In some embodiments, the pass-through link communication device compares the count of the timer to a constant value. In some embodiments, the timer times out if the pass-through link communication device determines that the timer exceeds a constant value (e.g., the timer is incremented and becomes greater than the constant value) or if the pass-through link communication device determines that the timer is decremented to zero (e.g., the timer's timer is initialized to a configured constant value and decremented to zero). In response to the determination, resources previously allocated to the pass-through link communication device are removed from use (306).

In some implementations, the pass-through link communication device starts a timer when at least one of a physical layer problem is detected, a radio link failure is detected, a connection reestablishment procedure is initiated, or a feedback message is transmitted in an RRC connected state. In some implementations, the pass-through link communication device stops when at least one of receiving N311 consecutive synchronization indications from a lower layer (e.g., MAC layer) for a particular cell (SpCell), receiving a RRCConnectionReconfiguration message with a reconfiguration WithSync message for a group of cells, initiating a connection reestablishment procedure, a timer determining whether the timer has timed out, or receiving an RRC connection reestablishment (e.g., RRC reestablishment) message. In some embodiments, the timer determines whether the timer has expired. In some implementations, the pass-through link communication device receives a message from a wireless communication node. In some embodiments, the message indicates information about periodicity and information about frequency domain allocated resources. In some implementations, the pass-through link communication device transmits the feedback message to the wireless communication node based on the message.

In some implementations, whether the UE can continue to use the pass-through link (e.g., PC 5) to configure the grant resources is determined based on the UE's usage. In some embodiments, if the UE has traffic to send at all times, the resource may be used at all times. However, in some embodiments, if the UE does not use PC5 to configure an authorized resource (e.g., does not transmit data on the resource) for none of the consecutive N resources or consecutive T milliseconds (ms), the UE releases the resource. The base station may configure other connected UEs to detect that PC5 is configuring authorized resources. The UE may report the resource to the BS if the resource has no data transmission within consecutive N resources or consecutive Tms. In some embodiments, the base station listens to the magnitude of the received signal energy configuring the grant resource location to determine if PC5 resources are being used. The BS may release the configuration grant resources if the BS knows that the resources have not been used for either N consecutive resources or consecutive Tms.

Fig. 4 is a flow chart illustrating an example flow 400 for using resources in a pass-through link communication according to some embodiments of the invention. In some implementations, the flow 400 may be performed by a pass-through link communication device (e.g., UE104a or UE104 b). Additional, fewer, or different operations may be performed in the process 400, depending on the implementation. The cut-through link communication device receives a message from the wireless communication node indicating a resource threshold or a time threshold (402). The pass-through link communication device determines whether the pass-through link communication device is not transmitting data on the resource threshold number of consecutive resources or is not transmitting data on the time threshold number of consecutive times (404). In response to the determination, resources previously allocated to the wireless communication device are removed from use by the pass-through link communication device (406).

Fig. 5 is a flow chart illustrating an example flow 500 of using resources in a pass-through link communication according to some embodiments of the invention. In some implementations, the process 500 may be performed by a pass-through link communication device (e.g., UE104a or UE104 b). Additional, fewer, or different operations may be performed in the process 500, depending on the embodiment. The direct link communication device receives a message from the wireless communication node through an RRC message or system information (502). The through link communication device continues to use resources previously allocated to the through link communication device based on determining whether a first condition indicated in the message is satisfied (504). The resources allocated to the pass-through link communication device before the pass-through link communication device ceases to use are determined (506) based on whether the second condition indicated in the message is satisfied.

In some embodiments, the message comprises an RRC release message. In some embodiments, the first condition includes at least one of whether the through link communication device enters an RRC idle state, whether DATAINACTIVITYTIMER times out, or whether a higher layer indicates to release the RRC connection. In some implementations, the second condition includes at least one of whether the through link communication device is not transmitting data on the resource threshold number of consecutive resources or is not transmitting data on the time threshold number of consecutive times, whether a timer indicated in the message times out, or whether the through link communication device reselects to a cell different from a cell to which the through link communication device was previously connected.

In some embodiments, UE1 (e.g., UE104 a) and UE2 (e.g., UE104 b) establish a direct link unicast communication connection. After UE1 detects that the unicast through link RLF occurs, in some embodiments, UE1 notifies the serving cell of UE1 that the indication information of the through link RLF occurs, where the noble site indication information includes at least one of a destination UE Identification (ID), a destination ID, a link ID, and RLF indication information. Thereafter, the UE may release the already allocated resources for the RLF link that occurred, including the PC5 configuring grant resources or dynamically scheduled resources. After receiving this information, the BS may release the resources already allocated to the UE for the RLF link to occur, including the PC5 configuring grant resources or dynamically scheduled resources.

Fig. 6 is a flow chart illustrating an exemplary flow 600 for using resources in a pass-through link communication according to some embodiments of the invention. In some implementations, the flow 600 may be performed by a pass-through link communication device (e.g., UE104a or UE104 b). Additional, fewer, or different operations may be performed in the process 600, depending on the embodiment. The first pass-through link communication device determines a wireless link state between the first pass-through link communication device and a second pass-through link communication device (602). The first pass-through link communication device sends a signal to a wireless communication node (604) representative of a wireless link state between the first pass-through link communication device and the second pass-through link communication device.

In the related art, the network side may configure the number of retransmissions for the UE for each bandwidth portion (BWP). Based on different traffic types, the New Radio (NR) V2X has different quality of service (QoS) requirements. Different logical channels, logical Channel Groups (LCGs), or QoS may be used to configure different numbers of transmissions. The base station determines the size of resources and the number of transmissions required for each LCG according to a Buffer Status Report (BSR) reported, sent or otherwise provided by the UE, and allocates corresponding resources.

For example, the UE currently has two LCGs to send, LCG ID1 and LCG ID2, respectively. The number of transmissions of LCG ID1 is 1, and the number of transmissions of LCG ID2 is greater than 1 (e.g., 4). The BS may allocate resources based on the maximum number of transmissions or may also allocate resources for one transmission. If the UE has an LCG ID of 4 based on the maximum number of transmissions, four transmission resources are allocated to the UE. However, after the UE obtains the grant resource, the UE may generate a Transport Block (TB) in various ways.

In one example, the UE may assemble transport blocks according to a priority order. Under the condition that the priority corresponding to the LCG ID1 is higher, the UE obtains the resources of four times of transmission. If the data (packet data unit (PDU)) corresponding to LCG ID1 is preferentially assembled, it may result in insufficient remaining resources for the UE to transmit LCG ID2. In such a case, the UE needs to continue applying for resources for four transmissions.

For another example, after obtaining the four transmission grants, the UE preferentially transmits data corresponding to the LCGID2 configured with four transmission opportunities. If there are remaining resources, data corresponding to LCGID1 may be transmitted. If the remaining resources are insufficient, the UE needs to wait for the next grant. Then the next UE does not need to apply for resources for four more transmissions. However, if the BS allocates resources for the UE for a single transmission, data corresponding to the LCGID1 is preferentially assembled. If there are remaining resources, the four transmitted resources may be assembled to transmit either LCGID1 or LCGID2. If the resources are assembled to transmit LCGID1, the data is sent multiple times. If the resources are assembled to transmit LCGID2 and the BS then allocates the resources for four transmissions, the data cannot be retransmitted. The BS may preferably allocate transmission resources once for high priority and allocate resources for multiple transmissions for UEs starting in the next slot. In some embodiments, the BS informs the UE whether the data packet, which needs to be transmitted multiple times after allocating one transmission resource, can be transmitted using the resource. If the resources can be used, the BS may not allocate four resources for subsequent transmissions. If the resources are not used, the BS may then allocate resources for four transmissions to it and the UE may continue to wait for the next grant.

Fig. 7 is a flow chart illustrating an example flow 700 for using resources in a pass-through link communication according to some embodiments of the invention. In some implementations, the flow 700 may be performed by a pass-through link communication device (e.g., UE104a or UE104 b). Additional, fewer, or different operations may be performed in the process 700, depending on the embodiment. The cut-through link communication device receives a message from a wireless communication node (702). The message indicates a resource and further indicates a data type, a logical channel type, or a logical channel group type allocated for the resource. The cut-through link communication device transmits data using resources based on the data type, the logical channel type, or the logical channel group type (704). In some embodiments, the message is received via downlink control information or RRC message. In some embodiments, the data type, logical channel type, or logical channel type is configured to use the resource for a single transmission, to use the resource for multiple transmissions, or a combination thereof.

If the UE is allocated multiple retransmission resources, at the location of the retransmission resources, if a new data packet of higher priority arrives, the retransmission resources may be used for the new data packet in some embodiments. If the retransmitted resources are not reserved waiting for NACK feedback, the retransmitted resources are not used or released, and the retransmitted resources can be directly used for the new data packet. If the UE receives Negative Acknowledgement (NACK) feedback, the UE cannot use the retransmitted resources for other data packets. In some embodiments, if the retransmitted resources are used for new data packet transmission, the configured number of transmissions cannot be reached. However, whether retransmission resources are available for other new data packet transmissions may be determined by the BS, and which type of new data packet transmission may be determined and configured by the BS using other retransmission resources. In some embodiments, the BS may configure retransmission resources allocated preemptively for the QoS or LCID/LCGID corresponding data packets to transmit data preferentially. In some embodiments, the BS may configure whether the retransmitted resources are used for other higher priority new data packet transmissions.

Fig. 8 is a flow chart illustrating an exemplary flow 800 for using resources in a pass-through link communication according to some embodiments of the invention. In some implementations, the process 800 may be performed by a pass-through link communication device (e.g., UE104a or UE104 b). Additional, fewer, or different operations may be performed in the process 800, depending on the embodiment. The cut-through link communication device receives a message from a wireless communication node (802). The message indicates an initial transmission of a first Medium Access Control (MAC) Packet Data Unit (PDU) that is allowed to use resources allocated to retransmission of a second MAC PDU when a condition is satisfied. The cut-through link communication device transmits data using the resources based on the indicated message (804). In some embodiments, the condition is that the first MAPDU includes data of at least one of a quality of service (Qos) list, a Logical Channel Identifier (LCID) list, or a Logical Channel Group Identifier (LCGID) list.

While different embodiments of the present solution have been described above, it should be understood that they have been presented by way of example only, and not limitation. Likewise, the different diagrams may depict example architectures or configurations provided to enable those of ordinary skill in the art to understand the example features and functionality of the present solution. However, such persons will understand that the solutions are not limited to the illustrated example architectures or configurations, but may be implemented using a variety of alternative architectures and configurations. In addition, one or more features of one embodiment may be combined with one or more features of another embodiment described herein, as will be appreciated by those of ordinary skill in the art. Thus, the breadth and scope of the present invention should not be limited by any of the above-described exemplary embodiments.

It should also be understood that any reference to an element using names such as "first," "second," etc. in this disclosure generally does not limit the number or order of those elements. Rather, these designations may be used in the invention as a convenient means of distinguishing between two or more elements or instances of an element. Thus, reference to first and second elements does not mean that only two elements may be employed, or that the first element must somehow precede the second element.

In addition, those of skill in the art would understand that information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, and symbols that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

Those of skill would further appreciate that any of the different illustrative logical blocks, modules, processors, devices, circuits, methods, and functions described in connection with the aspects disclosed herein may be implemented with electronic hardware (e.g., digital embodiments, analog embodiments, or a combination of both), firmware, different forms of program or design code incorporating instructions (which may be referred to herein as "software" or "software modules" for convenience) or any combination of these techniques. To clearly illustrate this interchangeability of hardware, firmware, and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware, firmware, or software, or a combination of such techniques depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions do not result in a departure from the scope of the present disclosure.

Moreover, those of skill in the art will appreciate that the various illustrative logical blocks, modules, devices, components, and circuits described in this disclosure may be implemented within or performed by an Integrated Circuit (IC) that may comprise a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or other programmable logic device, or any combination thereof. Logic blocks, modules, and circuits may also include antennas and/or transceivers to communicate with various components within the network or within the device. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, a combination of DSP cores or the above microprocessors, or any other suitable configuration for performing the functions described herein.

If implemented in software, the functions may be stored on a computer-readable medium as one or more instructions or code. Thus, the steps of a method or algorithm disclosed herein may be embodied as software stored on a computer readable medium. Computer-readable media includes both computer storage media and communication media including any medium that can transfer a computer program or code from one place to another. A storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired program code in the form of instructions or data structures and that can be accessed by a computer.

In the present disclosure, the term "module" as used in the present disclosure refers to software, firmware, hardware, and any combination of these elements for performing the associated functions described in the present disclosure. In addition, for purposes of discussion, the different modules are described as discrete modules, however, as will be apparent to one of ordinary skill in the art, two or more modules may be combined to form a single module that performs the associated functions in accordance with embodiments of the present solution.

Additionally, memory or other storage, as well as communication components, may be employed in embodiments of the present solution. It will be appreciated that for clarity, the above description has described embodiments of the present solution with reference to different functional units and processors. However, it will be apparent that any suitable distribution of functionality between different functional units, processing logic elements or domains may be used without detracting from the present solution. For example, functions illustrated as being performed by separate processing logic elements or controllers may be performed by the same processing logic element or controller. Thus, references to specific functional units are only references to suitable means for providing the described functionality rather than indicative of a strict logical or physical structure or organization.

Various modifications to the embodiments described herein will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the novel features and principles disclosed herein, as described in the following claims.

Claims

1. A method of wireless communication, comprising:

determining, by one of a set of pass-through link communication devices, whether a resource is a PC5 configured grant resource used by the pass-through link communication device before a timer is started, wherein the pass-through link communication device starts the timer upon at least one of detecting a physical layer problem, detecting a radio link failure, initiating a connection reestablishment procedure, or transmitting a feedback message in an RRC connected state;

the direct link communication device continues to use the PC5 used by the direct link communication device to configure authorized resources before the timer is started based on the running state of the timer;

The through link communication device stops configuring authorized resources using the PC5 used by the through link communication device before the timer starts in response to the timer timeout.

2. The wireless communication method of claim 1, wherein the timer comprises a T310 timer, the method further comprising:

Determining the running state of the T310 timer as running, and

The resource continues to be used based on the determination.

3. The wireless communication method of claim 1, wherein the timer comprises a T311 timer, the method further comprising:

determining the running state of the T311 timer as running, and

The resource continues to be used based on the determination.

4. The wireless communication method of claim 1, wherein the timer comprises at least one of a T310 timer or a T311 timer, the method further comprising:

determining the running state of the T310 timer or the T311 timer as running;

determining whether a cell in which the through link communication device detects a physical layer problem or radio link failure has transmitted a message including information allowing continued use of the resource, and

And continuing to use the resource according to the determination.

5. The wireless communication method of claim 1, wherein the timer comprises a T301 timer, the method further comprising:

Determining the running state of the T301 timer as running;

Determining whether the cell from which the through link communication device initiates reestablishment is a source cell to which the through link communication device was previously connected, and

And continuing to use the resource according to the determination.

6. The wireless communication method of claim 1, wherein the timer comprises a T304 timer, the method further comprising:

Determining the running state of the T304 timer to be running;

determining whether the RRC connection reconfiguration message includes an indication that the resource is allowed to continue to be used, and

And continuing to use the resource according to the determination.

7. The wireless communication method according to claim 1, further comprising:

The through link communication device receives a message from a wireless communication node, wherein the message indicates that the allocated through link resources are allowed to continue to be used when a physical layer problem or radio link failure is detected, and

And continuing to use the resources according to the message.

8. The wireless communication method according to claim 1, further comprising:

The through link communication apparatus receives a message from a wireless communication node, wherein the message indicates that the allocated through link resources are allowed to continue to be used during a handoff procedure or a T304 timer is running, and

And continuing to use the resources based on the message according to the message.

9. A method of wireless communication, comprising:

a pass-through link communication device of a group of pass-through link communication devices receives a message from a wireless communication node indicating a timer and a constant value associated with the timer;

The pass-through link communication means determining whether the timer has timed out based on the constant value;

The direct link communication device continues to use the PC5 used by the direct link communication device before the start of the timer to configure authorized resources based on the running state of the timer, wherein the direct link communication device starts the timer when at least one of the following is detected, the wireless link failure is detected, the connection reestablishment flow is initiated or a feedback message is transmitted in the RRC connection state;

The through link communication device configures authorized resources for use by the PC5 before the through link communication device starts a timer in response to the timer expiration.

10. The wireless communication method according to claim 9, further comprising:

Starting a timer when a physical layer problem is detected, and

The timer is stopped to determine if the timer times out when at least one of receiving N311 consecutive synchronization indications from a lower layer for a particular cell SpCel l, receiving an RRC reconfiguration message carrying reconfigurationWithSync messages for a group of cells, or initiating a connection re-establishment procedure occurs.

11. The wireless communication method according to claim 9, further comprising:

starting a timer after detecting a radio link failure or initiating a connection re-establishment procedure, and

The timer is stopped upon receipt of the RRC reestablishment message.

12. The wireless communication method according to claim 9, further comprising:

The timer is started when a feedback message is transmitted in the RRC connected state.

13. The wireless communication method according to claim 9, further comprising:

The through link communication device receives a message from the wireless communication node, wherein the message indicates information about periodicity and information about frequency domain allocation resources, and

The through link communication device transmits a feedback message to the wireless communication node based on the message.