Method and apparatus for performing sidelink communication

Abstract

A wireless communication method for use in a first wireless terminal is disclosed. The method includes determining a sidelink channel access priority for sidelink transmissions in an unlicensed carrier, and performing a listen before talk (LBT) procedure in the unlicensed carrier for the sidelink transmissions based on the sidelink channel access priority.

Description

Technical Field

[0001] The present disclosure relates generally to wireless communications, particularly fifth generation wireless communications and more particularly to sidelink communications. Background Art

[0002] Generally speaking, wireless communication is performed using user terminal devices and base stations. In addition, wireless communication is performed on carriers or frequency bands. Some carriers are licensed carriers, which are carriers that are licensed by governments or other authorized entities to service providers for exclusive use. On the other hand, other carriers are unlicensed carriers, which are carriers that are not authorized by such governments or other authorized entities. Currently, user terminal devices can communicate directly with each other on licensed carriers (i.e., without using base stations). However, it may be desirable for user terminal devices to communicate directly with each other on unlicensed carriers. Summary of the invention

[0003] The present disclosure relates to methods, systems and devices related to wireless communications, and more particularly, to methods, systems and devices related to sidelink communications when performing channel access on an unlicensed carrier (e.g., a shared spectrum).

[0004] The present disclosure relates to a wireless communication method for use in a first wireless terminal.

[0005] The method includes:

[0006] determining a sidelink channel access priority for sidelink transmissions in an unlicensed carrier, and

[0007] Based on the sidelink channel access priority, a listen-before-talk (LBT) procedure is performed for the sidelink transmission.

[0008] Various embodiments may preferably achieve the following features:

[0009] Preferably, determining the sidelink channel access priority for sidelink transmission in an unlicensed carrier includes: determining the sidelink channel access priority for at least one of a sidelink media access control (MAC) control element (CE) or a sidelink MAC protocol data unit (PDU).

[0010] Preferably, the sidelink channel access priority is determined based on the indication, wherein:

[0011] the first wireless terminal is in a connected state and the indication is received in a radio link control message,

[0012] The first wireless terminal is in an idle state and the indication is received in system information, or

[0013] The indication is preconfigured at the first wireless terminal.

[0014] Preferably, the indication comprises a channel access priority class (CAPC) value of the MAC CE.

[0015] Preferably, the sidelink transmission comprises a sidelink transmission block, and:

[0016] In response to the transport block including at least one of a sidelink signaling radio bearer (SRB), a sidelink broadcast control channel (SBCCH), or a sidelink MAC CE having a highest priority CAPC, the sidelink channel access priority is determined to be the highest priority CAPC;

[0017] In response to the transport block including only at least one sidelink MAC CE having a lowest priority CAPC, the sidelink channel access priority is determined to be the lowest priority CAPC;

[0018] In response to the transport block including only at least one sidelink DRB, the sidelink channel access priority is determined to be a lowest priority CAPC of at least one sidelink data radio bearer (DRB) in the transport block; or

[0019] In response to a transport block including only at least one sidelink DRB and at least one sidelink MAC CE without a fixed highest priority CAPC, the sidelink channel access priority is determined to be the lowest priority CAPC of the at least one sidelink DRB and at least one MAC CE in the transport block.

[0020] Preferably, the sidelink transmission comprises a sidelink transmission block and the sidelink channel access priority is determined as:

[0021] The highest priority CAPC of at least one logical channel in the MAC PDU, or

[0022] The lowest priority CAPC of at least one logical channel in the MAC PDU, or

[0023] The CAPC value associated with the priority of the sidelink transport block.

[0024] Preferably, the wireless communication method further comprises receiving a CAPC value for each priority value of the sidelink transmission block from the radio network node.

[0025] Preferably, the wireless communication method further comprises sending information associated with the CAPC of the multiple indications of the sidelink transmission block from the MAC entity of the first wireless terminal to the physical layer entity.

[0026] Preferably, the wireless communication method further comprises receiving a table indication of a table for performing the LBT process from a wireless network node, or

[0027] A table indication of a table pre-configured with a table for performing the LBT process.

[0028] Preferably, the table indication indicates a table for at least one of: per logical channel, per PC5 QoS profile, per PC5 QoS profile list, or per sidelink resource pool.

[0029] Preferably, the table used to perform the LBT process is pre-configured.

[0030] Preferably, the table is a CAPC table or a CAPC table for uplink.

[0031] The present disclosure relates to a wireless communication method for use in a wireless network node. The method comprises:

[0032] A table indication of a table for performing a listen-before-talk (LBT) procedure is sent to a wireless terminal.

[0033] Preferably, each embodiment can achieve the following features:

[0034] Preferably, the table indication indicates a table for at least one of: per logical channel, per PC5 QoS profile, per PC5 QoS profile list, or per sidelink resource pool.

[0035] Preferably, the table is a CAPC table or a CAPC table for uplink.

[0036] The present disclosure relates to a wireless communication method used in a wireless terminal. The method comprises:

[0037] Based on the indication of the channel access procedure type, a channel access procedure for the sidelink transmission is performed in the unlicensed carrier.

[0038] Preferably, each embodiment can achieve the following features:

[0039] Preferably, the channel access procedure type indicates at least one of a type 1 channel access procedure, a type 2 channel access procedure or a semi-static channel occupancy channel access procedure.

[0040] Preferably, the wireless communication method further comprises receiving an indication of a channel access procedure type from a wireless network node.

[0041] Preferably, the indication is pre-configured at the wireless terminal.

[0042] The present disclosure relates to a wireless communication method for use in a wireless network node. The method comprises:

[0043] An indication of a channel access procedure type for a channel access procedure for sidelink transmissions in an unlicensed carrier is sent to a wireless terminal.

[0044] Preferably, each embodiment can achieve the following features:

[0045] Preferably, the channel access procedure type indicates at least one of the following: a type 1 channel access procedure, a type 2 channel access procedure or a semi-static channel occupancy channel access procedure.

[0046] The present disclosure relates to a wireless communication method for use in a first wireless terminal.

[0047] The method includes:

[0048] receiving a sidelink resource indication from a second wireless terminal, the resource indication being used to perform a sidelink transmission in the unlicensed carrier after a time slot having an index n, and

[0049] Based on the sidelink resource indication, a sidelink transmission is performed in the unlicensed carrier after the time slot indexed n.

[0050] Preferably, each embodiment can achieve the following features:

[0051] Preferably, the sidelink resource indication comprises: a channel occupancy time sharing indication received in a time slot with index n and a time offset X, and the sidelink transmission performed in the unlicensed carrier is not earlier than a time slot with index n+X.

[0052] Preferably, the sidelink resource indication comprises a sidelink offset l and a sidelink duration d for time slot n, and the sidelink transmission in the unlicensed carrier is performed no earlier than a time slot with index n+l+i, where i=0,1,...,d-1.

[0053] Preferably, the wireless communication method further comprises sending a channel occupation time request to the second wireless terminal,

[0054] The channel occupation time request includes information associated with at least one of the following:

[0055] The traffic period of the sidelink transmission,

[0056] Duration of the sidelink transmission,

[0057] The number of resource blocks in the sidelink transmission,

[0058] The number of subbands for sidelink transmission,

[0059] Minimum timing offset, indicating the earliest timing at which a sidelink transmission can be performed,

[0060] The maximum timing offset, indicating the last timing at which a sidelink transmission is to be performed, or

[0061] Channel access priority for sidelink transmissions.

[0062] Preferably, the sidelink resource is associated with a priority threshold and a sidelink grant, and the priority value of data in the sidelink transmission is less than or equal to the priority threshold of the associated sidelink grant.

[0063] Preferably, the sidelink resource is associated with a destination ID identifier and a sidelink grant, and a receiver of the sidelink transmission is associated with an associated destination ID identifier of the associated sidelink grant.

[0064] The present disclosure relates to a wireless communication method for use in a second wireless terminal.

[0065] The method includes:

[0066] A sidelink resource indication is sent to the first wireless terminal, the sidelink resource indication being used to allow the first wireless terminal to perform a sidelink transmission in the unlicensed carrier after a time slot with index n.

[0067] Preferably, each embodiment can achieve the following features:

[0068] Preferably, the sidelink resource indication comprises a channel occupancy time sharing indication received in a time slot with index n and a time offset X, and the sidelink transmission performed in the unlicensed carrier is not earlier than a time slot with index n+X.

[0069] Preferably, the sidelink resource indication comprises a sidelink offset l and a sidelink duration d for time slot n, and the sidelink transmission performed in the unlicensed carrier is performed no earlier than a time slot indexed n+l+i, where i=0,1,…,d-1.

[0070] Preferably, the wireless communication method further comprises receiving a channel occupation time request from the first wireless terminal, wherein the channel occupation time request comprises information associated with at least one of the following:

[0071] The traffic period of the sidelink transmission,

[0072] Duration of the sidelink transmission,

[0073] The number of resource blocks in the sidelink transmission,

[0074] The number of subbands for sidelink transmission,

[0075] Minimum timing offset, indicating the earliest timing at which a sidelink transmission can be performed,

[0076] The maximum timing offset, indicating the last timing at which a sidelink transmission is to be performed, or

[0077] Channel access priority for sidelink transmissions.

[0078] Preferably, the sidelink resource is associated with a priority threshold and a sidelink grant, and the priority value of data in the sidelink transmission is less than or equal to the priority threshold of the associated sidelink grant.

[0079] Preferably, the sidelink resource is associated with a destination ID identifier and a sidelink grant, and a receiver of the sidelink transmission is associated with an associated destination ID identifier of the associated sidelink grant.

[0080] The present disclosure relates to a wireless communication method used in a first wireless terminal. The method includes:

[0081] Performing a listen-before-talk (LBT) procedure in an unlicensed carrier for sidelink transmissions,

[0082] Determine the results of the LBT process;

[0083] In response to determining that the LBT is successful, transmitting a sidelink signal to the second wireless terminal on a channel of the unlicensed carrier, and

[0084] In response to determining that the result is an LBT failure, an LBT failure indication is sent from the physical layer entity of the first wireless terminal to the medium access control (MAC) layer entity of the first user equipment.

[0085] Preferably, each embodiment can achieve the following features:

[0086] Preferably, in response to the MAC layer entity receiving an LBT failure indication for a most recent transmission resource from the physical layer entity, the most recent transmission resource is configured by a sidelink grant for physical uplink control.

[0087] Preferably, the method further comprises: sending a negative acknowledgement message to the radio network node in a physical uplink control channel.

[0088] Preferably, in response to the MAC entity receiving the LBT failure indication from the physical layer entity, the method further includes at least one of the following:

[0089] Trigger resource reselection,

[0090] Remove at least one resource from the resource pool for resource reselection.

[0091] discarding at least one resource from at least one selected resource obtained from resource reselection, or

[0092] At least one random resource is selected from the resources indicated by the physical layer entity, and the removed or discarded resources are replaced with the at least one random resource.

[0093] The present disclosure relates to a wireless communication method for use in a wireless terminal. The method comprises:

[0094] determining a plurality of physical sidelink feedback channel (PSFCH) reception opportunities for a physical sidelink shared channel (PSSCH),

[0095] performing a hybrid automatic repeat request (HARQ) based sidelink radio link failure (RLF) detection over the plurality of PSFCH reception opportunities to determine a number associated with consecutive failed receptions over the plurality of PSFCH reception opportunities, and

[0096] In response to a number of consecutive failed transmissions over a plurality of PSFCH reception opportunities reaching a threshold, an operation is performed.

[0097] Preferably, each embodiment can achieve the following features:

[0098] Preferably, performing HARQ-based sidelink radio link failure detection over a plurality of PSFCH reception opportunities to determine a number associated with consecutive failed transmissions over the plurality of PSFCH reception opportunities comprises:

[0099] Incrementing the number by 1 where all receptions are absent for multiple PSFCH reception opportunities for PSSCH, and

[0100] The number is set to 0, where at least one of the multiple PSFCH reception opportunities for PSSCH is successfully received.

[0101] Preferably, the number of consecutive failed transmissions on multiple PSFCH reception occasions reaches a threshold, and the operation includes at least one of the following:

[0102] Indicates HARQ-based sidelink RLF detection to the radio resource control layer entity,

[0103] determining that a sidelink RLF is detected for a destination wireless terminal of a PSSCH transmission,

[0104] releasing at least one data resource bearer of the destination wireless terminal,

[0105] releasing at least one signaling resource bearer of the destination wireless terminal,

[0106] releasing at least one PC5 relay radio link control RLC channel of the destination wireless terminal,

[0107] discarding the new radio sidelink communication related configuration of the destination wireless terminal, resetting the sidelink-specific MAC layer entity of the destination wireless terminal, or

[0108] It is determined that the PC5 radio resource control connection is released for the destination wireless terminal.

[0109] The present disclosure relates to a first wireless terminal, comprising:

[0110] The processor is configured as:

[0111] determining a sidelink channel access priority for sidelink transmissions in an unlicensed carrier, and

[0112] Based on the sidelink channel access priority, a listen-before-talk (LBT) procedure is performed in the unlicensed carrier for the sidelink transmission.

[0113] Preferably, each embodiment can achieve the following features:

[0114] Preferably, the processor is further configured to execute any of the above wireless communication methods.

[0115] The present disclosure relates to a wireless network node, comprising:

[0116] The communication unit is configured to send a table indication for performing a listen-before-talk (LBT) process to a wireless terminal.

[0117] Preferably, each embodiment can achieve the following features:

[0118] Preferably, the wireless network node further comprises a processor, and the processor is configured to execute any one of the above wireless communication methods.

[0119] The present disclosure relates to a wireless terminal, comprising:

[0120] A processor is configured to perform a channel access procedure for sidelink transmission in an unlicensed carrier based on the indication of the channel access procedure type.

[0121] Preferably, each embodiment can achieve the following features:

[0122] Preferably, the processor is further configured to execute any of the above wireless communication methods.

[0123] The present disclosure relates to a wireless network node, comprising:

[0124] A communication unit is configured to send an indication of a channel access procedure type for a channel access procedure for sidelink transmission in an unlicensed carrier to a wireless terminal.

[0125] Preferably, each embodiment can achieve the following features:

[0126] Preferably, the wireless network node further comprises a processor, wherein the processor is configured to execute any one of the above wireless communication methods.

[0127] A first wireless terminal, comprising:

[0128] The present disclosure relates to a communication unit configured to receive a sidelink resource indication from a second wireless terminal, the sidelink resource indication being used to perform a sidelink transmission in an unlicensed carrier after a time slot with an index n; and

[0129] A processor is configured to perform a sidelink transmission in an unlicensed carrier after a time slot with an index n based on the sidelink resource indication.

[0130] Preferably, each embodiment can achieve the following features:

[0131] Preferably, the processor is further configured to execute any of the above wireless communication methods.

[0132] The present disclosure relates to a second wireless terminal, comprising:

[0133] A communication unit is configured to send a sidelink resource indication to a first wireless terminal, where the sidelink resource indication is used to allow the first wireless terminal to perform sidelink transmission in an unlicensed carrier after a time slot with an index n.

[0134] Preferably, each embodiment can achieve the following features:

[0135] Preferably, the second wireless terminal further includes a processor, and the processor is configured to execute any one of the above wireless communication methods.

[0136] The present disclosure relates to a first wireless terminal, comprising:

[0137] The processor is configured as:

[0138] Performing a listen-before-talk (LBT) procedure in an unlicensed carrier for sidelink transmissions,

[0139] Determine the results of the LBT process;

[0140] In response to determining that the LBT is successful, transmitting a sidelink signal to the second wireless terminal on a channel of the unlicensed carrier, and

[0141] In response to determining that the result is an LBT failure, an LBT failure indication is sent from the physical layer entity of the first wireless terminal to the medium access control (MAC) layer entity of the first user equipment.

[0142] Preferably, each embodiment can achieve the following features:

[0143] Preferably, the processor is further configured to execute any of the above wireless communication methods.

[0144] The present disclosure relates to a wireless terminal, comprising:

[0145] The processor is configured as:

[0146] Determine multiple physical sidelink feedback channel PSFCH reception timings for the physical sidelink shared channel PSSCH,

[0147] performing hybrid automatic repeat request (HARQ) based sidelink radio link failure (RLF) detection over a plurality of PSFCH reception opportunities to determine a number associated with consecutive failed receptions over the plurality of PSFCH reception opportunities, and

[0148] The operation is performed in response to a number of consecutive failed transmissions over a plurality of PSFCH reception opportunities reaching a threshold.

[0149] Preferably, each embodiment can achieve the following features:

[0150] Preferably, the processor is further configured to execute any of the above wireless communication methods.

[0151] The present disclosure relates to a computer program product, which includes a computer-readable program medium code stored thereon, and when the code is executed by a processor, the processor executes the wireless communication method described in any one of the aforementioned methods.

[0152] The example embodiments disclosed herein are intended to provide features that will become apparent when referring to the following description and in conjunction with the accompanying drawings. According to various embodiments, example systems, methods, devices, and computer program products are disclosed herein. However, it should be understood that these embodiments are presented by way of example and not limitation, and it will be apparent to those of ordinary skill in the art who have read the present disclosure that various modifications may be made to the disclosed embodiments while remaining within the scope of the present disclosure.

[0153] Therefore, the present disclosure is not limited to the example embodiments and applications described and illustrated herein. In addition, the specific order and / or hierarchy of steps in the methods disclosed herein are merely example methods. Based on design preferences, the specific order or hierarchy of steps of the disclosed methods or processes can be rearranged while still within the scope of the present disclosure. Therefore, it will be understood by those of ordinary skill in the art that the methods and techniques disclosed herein present various steps or behaviors in a sample order, and unless otherwise expressly stated, the present disclosure is not limited to the specific order or hierarchy presented. BRIEF DESCRIPTION OF THE DRAWINGS

[0154] The above and other aspects and implementations thereof are described in more detail in the drawings, description and claims.

[0155] Figure 1 A schematic diagram of a wireless communication system according to an embodiment of the present disclosure is shown.

[0156] Figure 2 A schematic diagram showing a layer entity configuration of a communication node according to an embodiment of the present disclosure is shown.

[0157] Figure 3 A flow chart of a wireless communication method according to an embodiment of the present disclosure is shown, the method including detecting a listen-before-talk (LBT) failure.

[0158] Figures 4 to 6 A schematic diagram of sidelink communication according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0159]

[0013] The present specification describes various embodiments of systems, apparatuses, devices, and methods for wireless communications involving sidelink transmissions, including sidelink transmissions in unlicensed carriers.

[0160] Figure 1 A schematic diagram of an example wireless communication system 100 is shown, the system comprising a plurality of communication nodes (or just nodes) configured to wirelessly communicate with each other. Generally speaking, the communication nodes include at least one user equipment 102 and at least one wireless access node 104. Figure 1 The example wireless communication system 100 in FIG. 1 is shown as including two user devices 102 (including a first user device 102(1) and a second user device 102(2)) and one wireless access node 104. However, various other examples of the wireless communication system 100 include any of various combinations of user devices 102 and wireless access nodes 104, including two or more user devices 102 without any wireless access nodes 104, only one user device 102 and only one wireless access node 104, only one user device 102 and two or more wireless access nodes 104, two or more user devices 102 and one or more wireless access nodes 104, or two or more wireless access nodes 104 without any user devices 102.

[0161] In general, the user equipment described herein (e.g., user equipment 102) may include a single electronic device or apparatus, or multiple (e.g., network) electronic devices or apparatuses, capable of wireless communication over a network. The user equipment may include or be otherwise referred to as a user terminal, user terminal device, or user equipment (UE). In addition, the user device may be or include (but is not limited to) a mobile device (e.g., a mobile phone, a smart phone, a smart watch, a tablet, a laptop, a vehicle or other vessel (powered by human power, motor or engine, such as a car, airplane, train, ship or bicycle, etc.) or a fixed or stationary device (e.g., a desktop computer or other computing device that is generally not moved for a long time, such as a home appliance, other relatively heavy devices including the Internet of Things (IoT), or a computing device used in a commercial or industrial environment, as non-limiting examples). In various embodiments, the user device 102 may include a transceiver circuit 106 coupled to an antenna 108 to implement wireless communication with the wireless access node 104. The transceiver circuit 106 may also be coupled to a processor 110, and the processor 110 may also be coupled to a memory 112 or other storage device. The memory 112 may store instructions or codes therein, which, when read and executed by the processor 110, may cause the processor 110 to implement the various methods described herein.

[0162] In addition, in general, the wireless access nodes described herein, such as the wireless access node 104, may include a single electronic device or apparatus, or multiple (e.g., networked) electronic devices or apparatuses, and may include one or more base stations or other wireless network access points, capable of wirelessly communicating with one or more user devices and / or with one or more other wireless access nodes 104 over a network. For example, in various embodiments, the wireless access node 104 may include a 4G LTE base station, a 5G NR base station, a 5G central unit base station, a 5G distributed unit base station, a next generation Node B (gNB), an enhanced Node B (eNB), or other similar or next generation (e.g., 6G) base station. The wireless access node 104 may include a transceiver circuit 114 coupled to an antenna 116, which may include an antenna tower 118 in various approaches to enable wireless communication with the user device 102 or another wireless access node 104. The transceiver circuit 114 may also be coupled to one or more processors 120, which may also be coupled to a memory 122 or other storage device. The memory 122 may store therein instructions or codes, which, when read and executed by the processor 120 , cause the processor 120 to implement one or more methods described herein.

[0163] In various embodiments, two communication nodes in the wireless system 100, such as a user equipment 102 and a wireless access node 104, two user equipments 102 without a wireless access node 104, or two wireless access nodes 104 without a user equipment 102, may be configured to communicate wirelessly in or through a mobile network and / or a wireless access network according to one or more standards and / or specifications. In general, the standards and / or specifications may define rules or procedures by which communication nodes may communicate wirelessly, which in various embodiments may include rules or procedures for communicating in a millimeter (mm) wave band, and / or rules or procedures with a multi-antenna scheme and beamforming capabilities. Additionally or alternatively, the standards and / or specifications are standards and / or specifications defining radio access technologies and / or cellular technologies, such as fourth generation (4G) long term evolution (LTE), fifth generation (5G) new radio (NR), or unlicensed new radio (NR-U), as non-limiting examples.

[0164] In addition, in various embodiments, two or more communication nodes in the wireless system 100 may be configured to communicate according to vehicle networking standards and / or specifications. As used herein, vehicle networking refers to a large system for wireless communication and information exchange involving vehicles, pedestrians, roadside equipment, and the Internet according to any of a variety of communication protocols and data exchange standards. Vehicle networking communications can improve the performance of vehicles in terms of driving safety, traffic efficiency, usability, or user convenience features or entertainment. In addition, in any of the various embodiments, vehicle networking communications can be divided into three types: communication between vehicles (also known as vehicle-to-vehicle (V2V)); communication between vehicles and roadside equipment / network infrastructure (referred to as vehicle-to-infrastructure / vehicle-to-network (V2I / V2N)); and communication between vehicles and pedestrians (referred to as vehicle-to-pedestrian (V2P)). These types of communications are collectively referred to as vehicle-to-everything (V2X) communications. Communication nodes participating in V2X communications can communicate with each other according to any of the various V2X standards or specifications.

[0165] In the wireless system 100, communication nodes are configured to wirelessly transmit signals between each other. In general, communication between two communication nodes in the wireless system 100 can be or include sending or receiving, and usually both are performed simultaneously, depending on the perspective of the specific node in the communication. For example, for a given communication between a first node and a second node, wherein the first node sends a signal to the second node and the second node receives a signal from the first node, the first node may be referred to as a source node or a sending node or device, and the second node may be referred to as a destination node or a receiving node or device, and the communication may be regarded as the sending of the first node and the receiving of the second node. Of course, since the communication nodes in the wireless system 100 can both send and receive signals, a single communication node can be both a sending / source node and a receiving / destination node, or can switch between a sending node and a receiving node.

[0166] In addition, a specific signal may be characterized or defined as an uplink (UL) signal, a downlink (DL) signal, or a sidelink (SL) signal. An uplink signal is a signal sent from the user equipment 102 to the radio access node 104. A downlink signal is a signal sent from the radio access node 104 to the user equipment 102. A sidelink signal is a signal sent from one user equipment 102 to another user equipment 102, or a signal sent from one radio access node 104 to another radio access node 104. In addition, for sidelink transmission, the first / source user equipment 102 directly sends the sidelink signal to the second / destination user equipment 102 without any forwarding of the sidelink signal to the radio access node 104.

[0167] For at least some embodiments involving V2X communication, the user equipment 102 may perform sidelink transmissions. Such sidelink communication in V2X may be referred to as PC5-based V2X communication or V2X communication. In addition, for sidelink communication in V2X, the user equipment 102 may transmit sidelink signals to each other using a PC5 interface, where PC5 refers to a reference point for a user equipment 102 to communicate with another user equipment 102 through a direct channel.

[0168] As V2X technology (including the automation industry) develops, the scenarios of V2X communication are becoming increasingly diverse, and the performance requirements are becoming increasingly higher. Examples of advanced V2X services include vehicle platooning, extended sensors, advanced driving (semi-autonomous driving and fully autonomous driving), and remote driving. Example performance requirements for these advanced V2X services may include: support for data packets of 50 to 12,000 bytes in size, transmission rates of 2 to 50 messages per second, maximum end-to-end latency of 3 to 500 milliseconds, reliability of 90% to 99.999%, data rates of 0.5 to 1,000 megabytes per second (Mbps), or transmission distances of 50 to 1,000 meters (as non-limiting examples).

[0169] Additionally, a communication node using NR radio access operating in conjunction with shared spectrum channel access may be configured to operate in different modes, wherein a primary cell (PCells), a primary secondary cell (PSCells), or a secondary cell (SCells) may be in a shared spectrum, and the SCell may or may not be configured for uplink transmission. Furthermore, in both channel access modes, the wireless access node 104 and the user equipment 102 may be configured to apply or perform a listen-before-talk (LBT) procedure prior to performing transmissions on a cell configured with shared spectrum channel access.

[0170] Figure 2 A block diagram of multiple modules of a communication node (e.g., user equipment 102 or wireless access node 142) is shown, including a physical layer (PHY) entity or module (also referred to herein as just a PHY layer, a PHY module, or a PHY entity) 202, a medium access control (MAC) layer entity or module (also referred to herein as just a MAC layer, a MAC module, or a MAC entity) 204, a radio link control (RLC) layer entity or module (also referred to herein as just a RLC layer, a RLC entity, or a RLC module) 206, a packet data convergence protocol (PDCP) layer entity or module (also referred to herein as just a PDCP layer, a PDCP entity, or a PDCP module) 208, a radio resource control (RRC) layer entity or module (also referred to herein as just a RRC layer, a RRC entity, or a RRC module) 210, and a non-access stratum (NAS) layer entity or module (also referred to herein as just a NAS layer, a NAS entity, or a NAS module) 212.

[0171] In this disclosure, unless otherwise stated, the terms "layer", "entity" and "module" used herein, when used alone or in combination with each other, and when used for one or more components of a communication node, refer to an electronic device including hardware or a combination of hardware and software, such as an electronic circuit. In various embodiments, a module or entity may be considered Figure 110. The present invention may be implemented as a part or component of one or more components of a communication node in the wireless communication system, including a processor 110 / 120, a memory 112 / 122, a transceiver circuit 106 / 114, or an antenna 108 / 116. For example, the processor 110 / 120, for example, when executing computer code stored in the memory 112 / 116, may perform the functions of the module or entity. In addition, in various embodiments, the functions performed by the module or entity may be defined by one or more standards or protocols, such as 5G NR.

[0172] also, Figure 2 The layer entities 202-212 in the may be higher and lower layers relative to each other, wherein the PHY layer entity 202 is the lowest layer among the layer entities 202-212; the MAC layer entity 204 is a layer higher than the PHY layer entity 202 and lower than the other layer entities 206-212; the RLC layer entity 206 is higher than the PHY and MAC layer entities 202, 204 and lower than the PDCP, RRC and NAS layer entities 208-212; the PDCP layer entity 208 is higher than the PHY, MAC and RRC layer entities 202-206 and lower than the RRC and NAS layer entities 210, 212; the RRC layer entity 210 is higher than the PHY, MAC, RRC and PDCP layer entities 202-208 and lower than the NAS layer entity 212; and the NAS layer entity 212 is Figure 2 The highest level entity among the layer entities 202-220 shown. In various embodiments, the communication nodes of the system 100 may include Figure 2 Modules and / or layer entities other than those shown.

[0173] CAPC value:

[0174] Figure 3 A schematic diagram of a method 300 according to an embodiment of the present disclosure is shown. The method 300 is used for wireless communication, including sidelink communication between a first user equipment 102(1) and a second user equipment 102(2) on an unlicensed carrier. In an embodiment of the method 300, the first user equipment 102(1) acts as a source or a transmitting user equipment for transmitting a sidelink signal to the second user equipment 102(2), and the second user equipment 102(2) acts as a destination or a receiving user equipment for receiving a sidelink signal from the first user equipment 102(1).

[0175] In this disclosure, a licensed carrier refers to a carrier, frequency band or spectrum that is authorized by a government or other authorized entity (e.g., the Federal Communications Commission (FCC) in the United States or the European Telecommunications Standards Institute (ETSI) in Europe) for exclusive use by a service provider. An unlicensed carrier, also known as a shared spectrum, refers to a carrier, frequency band or spectrum that is not authorized by a government or other authorized entity.

[0176] In block 302, the first user device 102 (1) may perform a listen-before-talk (LBT) procedure in an unlicensed carrier for transmitting a sidelink signal. In general, when the user device 102 wants to transmit a signal (e.g., an uplink signal or a sidelink signal) on a channel of a particular carrier (unlicensed), the user device may perform an LBT procedure in the carrier before transmitting the signal. During the LBT procedure, the user device 102 may listen to or sense the channel to determine whether the channel is available (idle) or busy. In response to or as a result of performing the LBT procedure, the user device 102 may determine whether the LBT procedure is successful or failed. Success indicates that the channel is available, and then the user device 102 may continue to transmit the signal. Failure indicates that the channel is busy, and then the user device 102 determines not to transmit the signal.

[0177] In various embodiments, at block 302, the first user device 102(1) may perform an LBT procedure based on the sidelink channel access priority. Specifically, during the LBT procedure, the amount of time that the first device 102 must monitor the channel may depend on the value of the sidelink channel access priority. In addition, if the result of the LBT procedure is successful, the amount of time resources occupied by the channel may depend on the value of the sidelink channel access priority.

[0178] In some of these embodiments, the sidelink channel access priority is a sidelink channel access priority of a sidelink logical channel. For example, the first user device 102(1) may be configured with multiple logical channels, and each logical channel may have or be mapped to an associated priority value of the sidelink channel access priority. The priority values ​​for different logical channels may be the same, or may be different from each other. Accordingly, when the first user device 102(1) determines that data (e.g., data of a MAC protocol data unit (PDU)) is to be sent as part of a sidelink signal, the first user device 102(1) may determine the logical channel corresponding to the data, and then determine the priority value corresponding to the logical channel. The first user device 102(1) may then perform an LBT process based on the determined priority value.

[0179] Additionally, for at least some embodiments, the data (e.g., MAC PDU) may correspond to multiple logical channels. Accordingly, the first user device 102(1) may determine multiple priority values ​​for the multiple logical channels and then select a value corresponding to a highest priority value from the multiple priority values. In other embodiments, the first user device 102(1) may determine multiple priority values ​​for the multiple logical channels and then select a value corresponding to a lowest priority value from the multiple priority values.

[0180] In some embodiments, the sidelink channel access priority is a sidelink channel access priority of a quality of service (QoS) profile. The QoS profile may identify a set of QoS parameters corresponding to the data to be transmitted, such as a sidelink PC5 QoS identifier (PQI), a sidelink guaranteed flow bit rate (GFBR), a sidelink maximum flow bit rate (MFBR), and / or a sidelink range. For these embodiments, the first user device 102(1) may identify a QoS profile corresponding to the data to be transmitted in the sidelink transmission. Then, the first user device 102(1) may identify a priority value corresponding to the QoS profile. In addition, for at least some embodiments, the data (e.g., a MAC PDU) may correspond to multiple PC5 QoS profiles. Accordingly, the first user device 102(1) may determine multiple priority values ​​for the multiple QoS profiles and then select a value corresponding to the highest priority value from the multiple priority values. In other embodiments, the first user device 102(1) may determine multiple priority values ​​for the multiple QoS profiles and then select a value corresponding to the lowest priority value from the multiple priority values. The first user device 102(1) may then perform an LBT process according to the determined priority value.

[0181] Additionally or alternatively, the first user device 102 (1) may receive a sidelink channel access priority for each logical channel or each PC5 QoS profile or PC5 QoS profile list or MAC CE related to SL IUC (inter-UE coordination information) via an RRC message in response to the first user device 102 (1) being in an RRC connected state; may receive a sidelink channel access priority for each logical channel or each PC5 QoS profile or PC5 QoS profile list or MAC CE related to SL IUC (inter-UE coordination information) via system information in response to the first user device 102 (1) being in RRC idle; and / or may pre-configure the sidelink channel access priority for each logical channel or each PC5 QoS profile or PC5 QoS profile list or MAC CE related to SL IUC (inter-UE coordination information) in response to the UE being out of coverage.

[0182] Additionally or alternatively, in various embodiments, for the priority value of the LBT process, the first user equipment 102 (1) may use a channel access priority class (CAPC) of a radio bearer (RB) and a MAC control element (CE). In some embodiments, the CAPC of the RB and the MAC CE is either fixed or configurable. For example, for a sidelink signaling radio bearer (SRB) and one or more sidelink MAC CEs, the CAPC may be fixed to the highest priority; for a sidelink data radio bearer (DRB), the CAPC may be configurable by the network (radio access node 104); or for other sidelink MAC CEs, the CAPC may be fixed to the lowest priority. When selecting the CAPC for a given DRB, the radio access node 104 may consider the PQIs of all QoS flows multiplexed in the given DRB, while considering fairness between different service types and transmissions. The communication nodes in the system 100 may use a CAPC of a standardized PQI that best matches the QoS characteristics of the non-standardized PQI of the QoS flow corresponding to the non-standardized PQI.

[0183] Additionally or alternatively, in various embodiments, the first user device 102 (1) may select a CAPC as a priority for the LBT process by: in response to a transport block (TB) of a sidelink signal to be sent including a plurality of sidelink DRBs, selecting a highest priority CAPC for the sidelink DRBs; in response to the transport block including at least one sidelink SRB, a sidelink broadcast control channel (SBCCH), or a sidelink MAC CE having a highest priority CAPC, selecting a highest priority CAPC; or in response to the transport block including only one or more sidelink MAC CEs having a lowest priority CAPC, selecting a lowest priority CAPC; or in response to the transport block including only sidelink DRBs for the sidelink signal to be sent, selecting only sidelink DRBs, selecting a lowest priority CAPC for the sidelink DRBs; or in response to the transport block (TB) of a sidelink signal to be sent including only sidelink DRBs and one or more sidelink MAC CEs having a lowest priority CAPC, selecting a lowest priority CAPC for the sidelink DRBs.

[0184] Additionally or alternatively, in various embodiments, if a MAC PDU to be transmitted has been obtained, the MAC layer entity 204 of the first user equipment 102 (1) may determine a CAPC value for a TB for a source and destination pair of the MAC PDU. In an embodiment, the MAC layer entity 204 may set the CAPC value to a value of the highest priority of a logical channel (if included) and a MAC CE (if included) in the MAC PDU. In an embodiment, if a sidelink MAC CE and / or a sidelink SRB is not included in the MAC PDU, the MAC layer entity 204 may set the CAPC value to a value of the lowest priority of the logical channel. The MAC layer entity 204 then indicates the CAPC value to the PHY layer entity 202. The PHY layer entity 202 may perform an LBT procedure based on the CAPC priority value.

[0185] Additionally or alternatively, in response to the first user equipment 102 (1) being in an RRC connected state, the first user equipment 102 (1) may receive a sidelink channel access priority for each priority of the MAC PDU via an RRC message; in response to the first user equipment 102 (1) being in an RRC idle state, the first user equipment 102 (1) may receive a sidelink channel access priority for each priority of the MAC PDU via system information; and / or in response to the UE being out of coverage, the sidelink channel access priority for each priority of the MAC PDU may be pre-configured.

[0186] In some embodiments, if a MAC PDU to be transmitted has been obtained, the MAC layer entity 204 of the first user equipment 102 (1) determines a priority value of a TB for a source and destination pair of the MAC PDU. In an embodiment, the MAC layer entity 204 indicates the priority value of the MAC PDU to the PHY layer entity 202. The PHY layer entity 202 determines a CAPC value based on the indicated priority value of the MAC PDU and the sidelink channel access priority information for each priority of the MAC PDU. Then, the PHY layer entity 202 may perform an LBT process based on the determined priority value.

[0187] In an embodiment, the MAC layer entity 204 determines a priority value of the MAC PDU, then determines a CAPC value based on the priority value of the MAC PDU and information on a sidelink channel access priority for each priority of the MAC PDU, and then indicates the determined CAPC value to the PHY layer entity 202. The PHY layer entity 202 may then perform an LBT process based on the indicated priority value.

[0188] In an embodiment, a wireless communication method is disclosed. The method includes:

[0189] performing, with the first user equipment, an LBT procedure in an unlicensed carrier for sidelink transmission;

[0190] determining, using the first user equipment, a result of the LBT process;

[0191] In response to determining that the LBT is successful, using the first user equipment to send a sidelink signal to the second user equipment on a channel of the unlicensed carrier; and

[0192] In response to determining that the result is an LBT failure, a physical layer entity of the first user equipment is used to send an LBT failure indication to a medium access control (MAC) layer entity of the first user equipment.

[0193] In this embodiment, performing the LBT process in the unlicensed carrier may further include: using the first user equipment to obtain the sidelink channel access priority or SL MAC PDU priority of the sidelink MAC CE.

[0194] In an embodiment, the sidelink signal comprises a sidelink transmission block, and the method may further comprise:

[0195] selecting, with the first user equipment, a channel access priority class (CAPC) for the LBT procedure, wherein the selecting comprises one of:

[0196] In response to the transport block including at least one sidelink SRB, a sidelink broadcast control channel (SBCCH), or a sidelink MAC CE having a highest priority CAPC, selecting the highest priority CAPC; or

[0197] In response to a transport block including only one or more sidelink MAC CEs having a lowest priority CAPC, selecting the lowest priority CAPC, or

[0198] In response to a transport block (TB) of a sidelink signal to be sent including only a sidelink DRB, selecting a lowest priority CAPC for the sidelink DRB; or in response to a transport block (TB) of a sidelink signal to be sent including only a sidelink DRB and one or more sidelink MAC CEs that do not have a highest priority CAPC, selecting a lowest priority CAPC for the sidelink DRB and the MAC CE.

[0199] CAPC Form

[0200] During the delay duration T d During the additional time slot duration, after first sensing that the channel is idle and after the counter N is zero in step 4, the UE may send a sidelink transmission using a Type 1 channel access procedure. The counter N is adjusted by sensing the channel during the additional time slot duration according to the steps described below.

[0201] 1) Set N = N init , where N init is between 0 and CW p A random number uniformly distributed between and go to step 4;

[0202] 2) If N>0 and the UE chooses to decrement the counter, set N=N-1;

[0203] 3) Sense the channel during the extra time slot duration, and if the extra time slot duration is idle, go to step 4; otherwise, go to step 5;

[0204] 4) If N=0, stop; otherwise, go to step 2.

[0205] 5) Sense the channel until an additional delay duration T d A busy time slot is detected within the time interval, or all time slots of the additional postponement duration Td are detected to be free;

[0206] 6) If the channel is sensed to be idle during all time slots of the additional deferral duration Td, go to step 4; otherwise, go to step 5;

[0207] The parameter m p , CW min，p and CW max，p Based on channel access priority category p, as shown in Table 1 or Table 2 below.

[0208] Table 1: Channel Access Priority Class (CAPC)

[0209]

[0210] For p=3 and p=4, if it can be guaranteed on a long-term basis that there are no other technologies sharing the channel (e.g. by regulatory levels), then T m cot，p =10ms, otherwise T m cot，p =8ms.

[0211] Table 2: Channel Access Priority Class (CAPC) for UL

[0212]

[0213] If Table 1 is used, the UE can share a COT of a longer duration. If Table 2 is used, the UE can use a wider range of CWs to provide more back-off opportunities in the event of a collision, which means that more channel access opportunities can be obtained. However, the UE needs to determine which table to use when using the Type 1 channel access procedure. For one embodiment, the UE can obtain indication information from the network when it is in coverage, which indication information is about which table to use for the Type 1 channel access procedure. For another embodiment, when it is out of coverage, the UE can be pre-configured with indication information about which table to use for the Type 1 channel access procedure. For another embodiment, in response to the first user equipment 102 (1) being in an RRC connected state, the first user equipment 102 (1) may receive a sidelink channel access priority and / or an indication information regarding which table is used for a type 1 channel access procedure for each logical channel or each PC5 QoS profile or PC5 QoS profile list via an RRC message; in response to the first user equipment 102 (1) being in an RRC idle state, the sidelink channel access priority and / or an indication information regarding which table is used for a type 1 channel access procedure for each logical channel or each PC5 QoS profile or PC5 QoS profile list may be received via system information; and / or in response to the UE being out of coverage, the sidelink channel access priority and / or an indication information regarding which table is used for a type 1 channel access procedure for each logical channel or each PC5 QoS profile or PC5 QoS profile list may be pre-configured.

[0214] Channel access scheme

[0215] In some embodiments, the UE may send a sidelink transmission using a Type 1 channel access procedure or using a semi-static channel occupancy channel access procedure. For example, the semi-static channel occupancy channel access procedure may be defined in TS37.213: Technical Specification Group Radio Access Network; Physical layer procedures for shared spectrum channel access. If different UEs use different channel access procedures, it may be unfair to each other and the probability of collision will also increase. In fact, the channel access procedure based on semi-static channel occupancy is intended to ensure an environment where no other technologies exist. Considering that the UE may send sidelink transmissions in different sidelink RB sets (contiguous sets of resource blocks) or different sidelink resource pools or sidelink unlicensed carriers, the network provides the UE with an indication of whether to use the semi-static channel occupancy channel access procedure. Specifically, the network provides the UE with an indication of whether the semi-static channel occupancy channel access procedure is used for each sidelink RB set or sidelink resource pool or sidelink unlicensed carrier.

[0216] COT (Channel Occupancy Time)

[0217] For out-of-coverage (OOC) UEs, the UE may be pre-configured with an indication of whether to use a semi-static channel occupancy channel access procedure. Specifically, the UE may be pre-configured with an indication of whether the semi-static channel occupancy channel access procedure is used for each sidelink RB set or sidelink resource pool or sidelink unlicensed carrier. The UE may then perform a channel access procedure based on the configuration.

[0218] If the UE is instructed to perform a Type 2 channel access procedure, the UE uses a Type 2 channel access procedure for sidelink transmissions. The UE may send a transmission immediately after sensing that the channel is idle for at least one sensing interval. The sensing interval may be 0, 16 μs, 25 μs, or other values.

[0219] When the first UE shares a COT initiated by a second UE, the first UE may send a sidelink transmission after the sidelink transmission of the second UE.

[0220] In an embodiment, COTs may be shared based on the following steps.

[0221] Step 1: The second UE sends a "COT sharing indication" and "X" in SCI (Sidelink Control Information) to the first UE in time slot / subframe n;

[0222] Step 2: The first UE may send a sidelink transmission in time slot / subframe n+X.

[0223] In another embodiment, COTs may be shared based on the following steps:

[0224] Step 1: The second UE sends the "SL Duration and Offset" field to the first UE, indicating the "SL Offset" l and "SL Duration" d of time slot / subframe n;

[0225] Step 2: The first UE may use channel access procedure type 2 for sidelink transmission in time slot / subframe n+1+i, where i=0, 1,…, d-1.

[0226] In order to avoid wasting resources and improve resource utilization, the first UE may send a COT request to the second UE before the above step 1. In an embodiment, the COT request includes at least one of the following:

[0227] TrafficPeriodicity ENUMERATED{ms20,ms50,ms100,ms200,ms300,ms400,ms500,ms600,ms700,ms800,ms900,ms1000},

[0228] duration INTEGER(1...39),

[0229] MintimingOffset INTEGER(1…39),

[0230] MaxtimingOffset INTEGER(1...39),

[0231] RBNum or SubbandNum

[0232] channelAccessPriorityINTEGER(1...4)

[0233] Among them, the above parameters can be defined as:

[0234] -trafficPeriodicity indicates the estimated data arrival period. The value of trafficPeriodicity ms20 corresponds to 20ms, the value corresponds to 50ms, and so on;

[0235] -Duration indicates the estimated data arrival duration;

[0236] -RBNum indicates the maximum number of RBs based on the observed traffic pattern;

[0237] -SubbandNum indicates the maximum number of subbands based on observed traffic patterns.

[0238] -MintimingOffset indicates the minimum estimated timing of arrival of a data packet.

[0239] -MaxtimingOffset indicates the maximum estimated timing of arrival of a data packet.

[0240] –channelAccessPriority indicates the channel access priority for estimated data arrival.

[0241] In an embodiment, the COT request may include multiple sets of the above parameters.

[0242] LCP (Logical Channel Priority)

[0243] In some embodiments, the first UE may share a COT initiated by a second UE or a network (e.g., a gNB). For example, the second UE or gNB may provide a sidelink grant with a priority value P to the first UE.

[0244] When the first UE obtains a sidelink grant, the first UE may perform a sidelink logical channel prioritization procedure to obtain a MAC PDU to be sent. During the sidelink logical channel prioritization procedure, the UE needs to determine which destination ID (identifier) ​​should be selected. The first UE may further determine which logical channels may be selected for the selected destination ID.

[0245] In an embodiment where the sidelink grant is associated with a priority value P and the UE obtains the sidelink channel access priority of each logical channel, the UE may select a logical channel whose CAPC value is not greater than the value P when performing the sidelink logical channel prioritization process.

[0246] In an embodiment where the sidelink grant is associated with a destination ID, the UE can only select the destination ID associated with the sidelink grant when performing the sidelink logical channel prioritization procedure.

[0247] Resource Allocation

[0248] In some embodiments, to perform sidelink communication, the UE may use mode 1 and / or mode 2 resource allocation mechanisms to send sidelink data. For the mode 2 resource allocation mechanism, the transmission resources are selected by the UE from the configured resource pool. For the mode 1 resource allocation mechanism, the transmission resources are scheduled by the network. When using the mode 1 resource allocation mechanism, the network may schedule more than one transmission resource in the DCI (downlink control information) via the PDCCH (physical downlink control channel). If the UE does not complete the transmission (for example, does not receive HARQ ACK (hybrid automatic repeat request acknowledgment) information from the peer UE) or believes that more retransmissions are needed, the UE may send a HARQ NACK to the network to request more transmission resources.

[0249] In an embodiment of a sidelink UE performing a mode 2 resource allocation mechanism, the sidelink UE may select resources for transmission in a configured resource pool. When the UE performs resource selection in an unlicensed band, the UE may perform an LBT process before using the selected resources to send sidelink data. If the result of the LBT process indicates success, the UE may use the selected resources to send sidelink data. When the result of the LBT process indicates failure (i.e., the selected resources cannot be used to continue sending data), the UE may immediately reselect another resource and remove or discard the originally selected resource. In an embodiment, a type 2 (2a, 2b, or 2c) LBT process may be used to reduce the delay in reselecting resources.

[0250] In an embodiment, if an LBT failure is detected on a selected sidelink resource (i.e., the result of the LBT procedure indicates a failure), the UE performs at least one of the following:

[0251] 1. Trigger resource reselection;

[0252] 2. Remove LBT failed resources from the selected sidelink resources;

[0253] 3. discard the LBT failed resources from the selected sidelink resources; or

[0254] 4. Randomly select resources from the resources indicated by the physical layer and replace the removed or discarded resources with the selected resources.

[0255] In an embodiment, the UE is allowed to perform at least one of the following types of LBT procedures on resources used to replace removed or discarded resources:

[0256] 1. Type 1 LBT process;

[0257] 2. Type 2 LBT process;

[0258] 3. Type 2a LBT process;

[0259] 4. Type 2b LBT process; or

[0260] 5. Type 2c LBT process.

[0261] Figure 4 FIG. 1 is a schematic diagram showing side link communication according to an embodiment of the present disclosure. Figure 4 In the embodiment, UE1 communicates with a peer UE (i.e., UE2) via sidelink communication (in unlicensed spectrum). UE1 performs an LBT procedure for sidelink communication and detects whether LBT fails or LCT succeeds. If LBT failure is detected, UE1 performs operations including at least one of the following:

[0262] Trigger resource reselection;

[0263] removing (multiple) LBT failed resources from the selected sidelink resources;

[0264] discarding the LBT failed resource(s) from the selected sidelink resources; or

[0265] A resource is randomly selected from the resources indicated by the physical layer, and the removed or discarded resource is replaced by the selected resource.

[0266] In some embodiments, the network may schedule more than one sidelink transmission resource via PDCCH and may also configure a HARQ feedback resource on PUCCH. When the UE has both a sidelink grant and a Uu grant and the UE cannot perform sidelink and Uu communications at the same time, a prioritization process may be required to prioritize one of the sidelink transmission and Uu transmission (i.e., sidelink data and Uu data) to be sent. If the SL transmission is not prioritized, the UE may send a NACK to the network to request more transmission resources. In an embodiment, if the nearest transmission resource (the resource configured for the sidelink transmission) is not prioritized, the UE may send a NACK to the network.

[0267] For example, 3 transmission resources are scheduled by DCI and are associated with the same PUCCH resource, and only the third transmission resource is not prioritized, then the UE needs to send a NACK to the network because the third transmission resource is the nearest resource used for PUCCH transmission.

[0268] In the embodiment of performing sidelink communication on the unlicensed frequency band, it is also possible that the latest transmission resource cannot be sent because the LBT process fails on the latest transmission resource. In this case, it is also necessary to send NACK information to the network to request more transmission resources.

[0269] In an embodiment, the UE instructs the physical layer (entity) to signal a NACK on the PUCCH if at least one of the following conditions is met:

[0270] 1. An LBT failure is detected on the most recent transmission resource of the MAC PDU;

[0271] 2. LBT on the most recently transmitted resource of the MAC PDU failed;

[0272] 3. An LBT failure indication is received from the lower layer regarding the most recent transmission resource of the MAC PDU;

[0273] 4. The most recent transmission resource was not sent due to LBT failure; or

[0274] 5. The most recent transmission resource has not been sent.

[0275] Figure 5 FIG. 1 is a schematic diagram showing side link communication according to an embodiment of the present disclosure. Figure 5In the embodiment, UE1 communicates with a peer UE (i.e., UE2) via sidelink communication, for example, on an unlicensed spectrum. In this embodiment, UE1 receives a sidelink grant from the network and can perform sidelink communication by using the sidelink grant. UE1 can perform an LBT procedure on a transmission resource (configured by the sidelink grant) to detect an LBT failure or an LBT success. For each PUCCH resource, if an LBT failure is detected on the nearest sidelink transmission resource, UE1 reports / sends a NACK to the network.

[0276] In some embodiments in which the UE performs sidelink communication, the UE sends data on a PSSCH (physical sidelink shared channel) and receives HARQ feedback on a PSFCH (physical sidelink feedback channel). Based on the HARQ feedback on the PSFCH, each PSSCH resource is associated with a PSFCH resource. Therefore, the UE can perform HARQ-based sidelink RLF (radio link failure) detection, i.e., detect sidelink RLF based on HARQ feedback on the PSFCH resource. Specifically, if the number of consecutive missing PSFCHs reaches a maximum value, the UE considers / determines that a SL RLF is detected.

[0277] When using unlicensed bands as PSFCH resources, it is possible to detect LBT failure on PSFCH resources. To address this issue, more than one PSFCH resource associated with one transmission can be configured for the receiving UE to send HARQ feedback. Therefore, it should be specified how the UE performs HARQ-based SL RLF detection.

[0278] In an embodiment, in response thereto, the UE is configured with more than one PSFCH reception opportunity associated with one PSSCH transmission:

[0279] Step 1: If all PSFCH receptions are absent at the PSFCH reception opportunity for PSSCH transmission, then numConsecutiveDTX (ie, an integer variable) is incremented by 1, otherwise numConsecutiveDTX is reinitialized / set to 0.

[0280] Step 2: If numConsecutiveDTX reaches the maximum value, the HARQ-based sidelink RLF detection is indicated to the RRC layer entity.

[0281] Steps 1 and 2 above can be achieved as follows:

[0282] 1> If all PSFCH receptions do not exist during PSFCH receptions during PSSCH transmission:

[0283] 2>Increment numConsecutiveDTX by 1;

[0284] 2> If numConsecutiveDTX reaches the maximum value:

[0285] 3> Indicate HARQ-based sidelink RLF detection to RRC.

[0286] 1> Otherwise:

[0287] 2>Reinitialize numConsecutiveDTX to zero.

[0288] In an embodiment, for each PSSCH transmission, the UE performs the following steps:

[0289] Step 1: If all HARQ feedback for this PSSCH transmission is not present, then increment numConsecutiveDTX (ie, an integer variable) by 1, otherwise reinitialize / set numConsecutiveDTX to 0.

[0290] Step 2: If numConsecutiveDTX reaches the maximum value, the HARQ-based sidelink RLF detection is indicated to the RRC layer entity.

[0291] Steps 1 and 2 of this embodiment can be implemented in the following manner:

[0292] 1> If all HARQ feedback for this PSSCH transmission does not exist,

[0293] 2>Increment numConsecutiveDTX by 1;

[0294] 2> If numConsecutiveDTX reaches the maximum value:

[0295] 3> Indicate HARQ-based sidelink RLF detection to RRC.

[0296] 1> Otherwise:

[0297] 2>Reinitialize numConsecutiveDTX to zero.

[0298] In an embodiment where numConsecutiveDTX reaches a maximum value, the UE performs at least one of the following:

[0299] 1. Indicate HARQ-based sidelink RLF detection to RRC,

[0300] 2. Considering that a sidelink radio link failure is detected for the destination,

[0301] 3. Release the DRB for the destination.

[0302] 4. Release the SRB for the destination,

[0303] 5. Release the PC5 relay RLC channel of the destination,

[0304] 6. discard the NR (New Radio) sidelink communication related configuration for the destination,

[0305] 7. Reset the sidelink-specific MAC for that destination, or

[0306] 8. Consider releasing the PC5-RRC connection for this destination.

[0307] Figure 6 FIG. 1 is a schematic diagram showing side link communication according to an embodiment of the present disclosure. Figure 6 In the embodiment, UE1 communicates with a peer UE (i.e., UE2) via sidelink communication, for example, on an unlicensed spectrum. In this embodiment, UE2 sends feedback on the PSFCH. UE1 receives the feedback on the PSFCH and detects whether a sidelink RLF occurs. If the number of all PSFCH receptions that do not exist on one or more PSFCH reception occasions associated with the same SCI reaches a maximum value, UE1 determines that a sidelink RLF is detected. It should be noted that the number can be determined based on the above-mentioned embodiments. In addition, UE1 can further perform other operations described in the above-mentioned embodiments.

[0308] Although various embodiments of the present disclosure have been described above, it should be understood that these embodiments are presented only by way of example, not by way of limitation. Similarly, various schematic diagrams may describe example architectures or configurations, which are provided to enable those of ordinary skill in the art to understand the example features and functions of the present disclosure. However, these technicians should understand that the present disclosure is not limited to the example architectures or configurations described, but may be implemented using various alternative architectures and configurations. In addition, as will be appreciated by those of ordinary skill in the art, one or more features of an embodiment may be combined with one or more features of another embodiment described herein. Therefore, the breadth and scope of the present disclosure should not be limited by any of the example embodiments described above.

[0309] In addition, it should be understood that any reference to an element using names such as "first," "second," etc., herein does not generally limit the number or order of these elements. Instead, these names can be used herein as a convenient means of distinguishing two or more elements or instances of an element. Thus, reference to a first and a second element does not mean that only two elements can be used, nor does it mean that the first element must precede the second element in some way.

[0310] In addition, those skilled in the art will appreciate that information and signals may be represented using any of a variety of different technologies and techniques. For example, the data, instructions, commands, information, signals, bits, and symbols mentioned in the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0311] The skilled person will further recognize that any of the various illustrative logical blocks, units, processors, components, circuits, methods, and functions described in conjunction with the various aspects disclosed herein may be implemented by electronic hardware (e.g., digital implementation, analog implementation, or a combination of both), firmware, various forms of programs or design codes containing instructions (which, for convenience, may be referred to herein as "software" or "software units"), or any combination of these technologies.

[0312] In order to clearly illustrate this interchangeability of hardware, firmware and software, various illustrative components, modules, units, circuits and steps are generally described above from their functional perspective. As for whether these functions are implemented in the form of hardware, firmware or software, or in the form of a combination of these technologies, it depends on the specific application and the design restrictions imposed on the entire system. The technician can implement the functions in various ways for each specific application, but this implementation decision will not lead to deviation from the scope of this disclosure. According to various embodiments, processors, devices, components, circuits, structures, machines, units, etc. can be configured to perform one or more functions described herein. The term "configured to" or "configured for" used herein for a specific operation or function refers to that the processor, device, component, circuit, structure, machine, unit, etc. is physically constructed, programmed and / or arranged to perform a specific operation or function.

[0313] In addition, the skilled person will understand that the various illustrative logic blocks, units, devices, components and circuits described herein may be implemented in or performed by an integrated circuit (IC), which may include 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. The logic blocks, units and circuits may also include antennas and / or transceivers to communicate with various components within a network or within a device. The general-purpose processor may be a microprocessor, but in an alternative, the processor may be any conventional processor, controller or state machine. The processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, a combination of one or more microprocessors and a DSP core, or any other suitable configuration for performing the functions described herein. If implemented in software, the functions may be stored as one or more instructions or codes on a computer-readable medium. Therefore, the steps of the method or algorithm disclosed herein may be implemented as software stored on a computer-readable medium.

[0314] Computer-readable media include computer storage media and communication media, wherein communication media include any medium capable of transferring a computer program or code from one place to another. Storage media can be any available medium that can be accessed by a computer. By way of example and not limitation, such computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage devices, magnetic disk storage devices or other magnetic storage devices, or any other medium that can be used to store the desired program code in the form of instructions or data structures and can be accessed by a computer.

[0315] In this document, the term "unit" as used herein refers to software, firmware, hardware, and any combination of these elements, for performing the relevant functions described herein. In addition, for ease of discussion, various units are described as discrete units; however, it is obvious to a person of ordinary skill in the art that two or more units can be combined to form a single unit to perform relevant functions according to the embodiments of the present disclosure.

[0316] In addition, memory or other storage and communication components may be used in embodiments of the present disclosure. It is to be understood that, for clarity, the above description has described embodiments of the present disclosure with reference to different functional units and processors. However, it is apparent that any suitable functional distribution may be used between different functional units, processing logic elements or domains without detracting from the present disclosure. For example, functions described as being performed by separate processing logic elements or controllers may be performed by the same processing logic element or controller. Therefore, reference to a specific functional unit refers only to a suitable method for providing the function, rather than representing a strict logical or physical structure or organization.

[0317] It will be apparent to those skilled in the art that various modifications may be made to the embodiments described in the present disclosure, and the general principles defined herein may be applied to other embodiments without departing from the scope of the claims. Therefore, the present disclosure is not intended to be limited to the embodiments shown herein, but should be given the broadest scope consistent with the novel features and principles disclosed herein, as described in the following claims.

Claims

1. A wireless communication method for use in a first wireless terminal, the method comprising: determining a sidelink channel access priority for sidelink transmissions in an unlicensed carrier, and Based on the sidelink channel access priority, a listen-before-talk (LBT) procedure is performed in the unlicensed carrier for the sidelink transmission.

2. The wireless communication method of claim 1 , wherein determining the sidelink channel access priority for the sidelink transmission in the unlicensed carrier comprises: The sidelink channel access priority is determined for at least one of a sidelink media access control (MAC) control element (CE) or a sidelink MAC protocol data unit (PDU).

3. The wireless communication method according to claim 1 or 2, wherein the sidelink channel access priority is determined based on the indication, in: the first wireless terminal is in a connected state and the indication is received in a radio link control message, The first wireless terminal is in an idle state and the indication is received in system information; or The indication is pre-configured in the first wireless terminal.

4. The wireless communication method according to claim 3, wherein the indication comprises a channel access priority class (CAPC) value of the MAC CE.

5. The wireless communication method according to any one of claims 1 to 4, wherein the sidelink transmission comprises a sidelink transmission block, and in: In response to the transport block including at least one of a sidelink signaling radio bearer (SRB), a sidelink broadcast control channel (SBCCH), or a sidelink MAC CE having a highest priority CAPC, the sidelink channel access priority is determined to be the highest priority CAPC; In response to the transport block including only at least one sidelink MAC CE having a lowest priority CAPC, the sidelink channel access priority is determined to be the lowest priority CAPC, In response to the transport block including only at least one sidelink data radio bearer (DRB), the sidelink channel access priority is determined to be a lowest priority CAPC of the at least one sidelink DRB in the transport block; or In response to the transport block including only at least one sidelink DRB and at least one sidelink MAC CE without a fixed highest priority CAPC, the sidelink channel access priority is determined to be the lowest priority CAPC of the at least one sidelink DRB and the at least one MAC CE in the transport block.

6. The wireless communication method according to any one of claims 1 to 5, wherein the sidelink transmission comprises a sidelink transmission block, and The sidelink channel access priority is determined as: the highest priority CAPC of at least one logical channel in the MAC PDU, or the lowest priority CAPC of at least one logical channel in the MAC PDU, or A CAPC value associated with the priority of the sidelink transport block.

7. The wireless communication method according to claim 6, further comprising: A CAPC value is received from the radio network node for each priority value of the sidelink transport block.

8. The wireless communication method according to claim 6 or 7, further comprising: Information associated with the indicated CAPC of the sidelink transmission block is sent from a MAC entity of the first wireless terminal to a physical layer entity.

9. The wireless communication method according to any one of claims 1 to 8, further comprising: receiving from a radio network node a table indication of a table to be used for performing said LBT procedure, or A table indication is pre-configured with a table used to perform the LBT process.

10. The wireless communication method of claim 9, wherein the table indication specifies a table for at least one of: each logical channel, each PC5 QoS profile, each PC5 QoS profile list, or each sidelink resource pool.

11. The wireless communication method according to any one of claims 1 to 10, wherein a table used to perform the LBT process is preconfigured.

12. The wireless communication method according to any one of claims 9 to 11, wherein the table is a table of CAPC or a table of CAPC for uplink.

13. A wireless communication method for use in a wireless network node, the method comprising: A table indication of a table used to perform a listen-before-talk (LBT) procedure is sent to the wireless terminal.

14. The wireless communication method of claim 13, wherein the table indication specifies a table for at least one of: each logical channel, each PC5 QoS profile, each PC5 QoS profile list, or each sidelink resource pool.

15. The wireless communication method according to claim 13 or 14, wherein the table is a table of CAPC or a table of CAPC for uplink.

16. A wireless communication method for use in a wireless terminal, the method comprising: Based on the indication of the channel access procedure type, a channel access procedure for the sidelink transmission is performed in the unlicensed carrier.

17. The wireless communication method according to claim 16, wherein the channel access procedure type indicates at least one of the following: a type 1 channel access procedure, a type 2 channel access procedure, or a semi-static channel occupancy channel access procedure.

18. The wireless communication according to claim 16 or 17, further comprising: The indication of the channel access procedure type is received from a radio network node.

19. Wireless communication according to claim 16 or 17, wherein the indication is pre-configured in the wireless terminal.

20. A wireless communication method for use in a wireless network node, the method comprising: An indication of a channel access procedure type for a channel access procedure for sidelink transmissions in an unlicensed carrier is sent to a wireless terminal.

21. The wireless communication method according to claim 20, wherein the channel access procedure type indicates at least one of the following: a type 1 channel access procedure, a type 2 channel access procedure, or a semi-static channel occupancy channel access procedure.

22. A wireless communication method for use in a first wireless terminal, the method comprising: receiving a sidelink resource indication from a second wireless terminal, the sidelink resource indication being used to perform a sidelink transmission in an unlicensed carrier after a time slot having an index n, and The sidelink transmission is performed in the unlicensed carrier after the time slot with the index n based on the sidelink resource indication.

23. The wireless communication method according to claim 22, wherein the sidelink resource indication comprises: a channel occupancy time sharing indication and a time offset X received at said time slot having said index n, and Wherein the sidelink transmission in the unlicensed carrier is performed no earlier than a time slot with index n+X.

24. The wireless communication method according to claim 22, wherein the sidelink resource indication comprises: The sidelink offset l and the sidelink duration d for time slot n, and The sidelink transmission in the unlicensed carrier is performed no earlier than a time slot with index n+l+i, where i=0, 1, ..., d-1.

25. The wireless communication method according to any one of claims 22 to 24, further comprising: sending a channel occupation time request to the second wireless terminal, The channel occupation time request includes information associated with at least one of the following: the traffic period of the sidelink transmission, the duration of the sidelink transmission, the number of resource blocks in the sidelink transmission, the number of subbands used for said sidelink transmission, a minimum timing offset indicating the earliest timing at which the sidelink transmission is performed, a maximum timing offset, indicating the last timing at which said sidelink transmission is to be performed, or The channel access priority of the sidelink transmission.

26. The wireless communication method according to any one of claims 22 to 25, wherein the sidelink resource is associated with a priority threshold and a sidelink grant, and The priority value of the data in the sidelink transmission is less than or equal to the priority threshold used for the associated sidelink grant.

27. The wireless communication method according to any one of claims 22 to 25, wherein the sidelink resource is associated with a destination identifier and a sidelink grant, and Wherein a receiver of the sidelink transmission is associated with the destination identifier for the sidelink grant.

28. A wireless communication method for use in a second wireless terminal, the method comprising: A sidelink resource indication is sent to a first wireless terminal, the sidelink resource indication being used to allow the first wireless terminal to perform a sidelink transmission in an unlicensed carrier after a time slot with index n.

29. The wireless communication method according to claim 28, wherein the sidelink resource indication comprises: a channel occupancy time sharing indication and a time offset X received at said time slot having said index n, and Wherein the sidelink transmission in the unlicensed carrier is performed no earlier than a time slot with index n+X.

30. The wireless communication method of claim 28, wherein the sidelink resource indication comprises: the sidelink offset l and the sidelink duration d for said time slot n, and The sidelink transmission in the unlicensed carrier is performed no earlier than a time slot with index n+l+i, where i=0, 1, ..., d-1.

31. The wireless communication method according to any one of claims 28 to 30, further comprising: receiving a channel occupancy time request from the first wireless terminal, The channel occupation time request includes information associated with at least one of the following: the traffic period of the sidelink transmission, the duration of the sidelink transmission, the number of resource blocks in the sidelink transmission, the number of subbands used for said sidelink transmission, a minimum timing offset indicating the earliest timing at which the sidelink transmission is performed, a maximum timing offset, indicating the last timing at which said sidelink transmission is to be performed, or The channel access priority of the sidelink transmission.

32. The wireless communication method according to any one of claims 28 to 31, wherein the sidelink resource is associated with a priority threshold and a sidelink grant, The priority value of the data in the sidelink transmission is less than or equal to the priority threshold used for the associated sidelink grant.

33. The wireless communication method according to any one of claims 28 to 32, wherein the sidelink resource is associated with a destination identifier and a sidelink grant, Wherein a receiver of the sidelink transmission is associated with the destination identifier for the sidelink grant.

34. A wireless communication method for use in a first wireless terminal, the method comprising: For sidelink transmission, a listen-before-talk (LBT) procedure is performed in the unlicensed carrier. determining a result of the LBT process; In response to determining that the result is LBT success, sending a sidelink signal to the second wireless terminal on a channel in the unlicensed carrier, and In response to determining that the result is an LBT failure, an LBT failure indication is sent from a physical layer entity of the first wireless terminal to a medium access control (MAC) layer entity of the first user equipment.

35. The wireless communication method of claim 34, wherein the LBT failure indication is received by the MAC layer entity from the physical layer entity in response to the most recent transmission resource configured by the sidelink grant for a physical uplink control channel, The method further comprises: A negative acknowledgement message is sent in the physical uplink control channel to the radio network node.

36. The wireless communication method according to claim 34 or 35, wherein in response to receiving the LBT failure indication by the MAC entity from the physical layer entity, the method further comprises at least one of the following: Trigger resource reselection, removing the at least one resource from the resource pool used by the resource reselection, discarding the at least one resource from the at least one selected resource acquired by the resource reselection, or At least one random resource is selected from the resources indicated by the physical layer entity, and the removed or discarded resources are replaced with the at least one random resource.

37. A wireless communication method for use in a wireless terminal, the method comprising: determining a plurality of physical sidelink feedback channels PSFCH reception timings for a physical sidelink shared channel (PSSCH), performing a sidelink radio link failure (RLF) detection based on a hybrid automatic repeat request (HARQ) on the plurality of PSFCH reception opportunities to determine a number associated with consecutive failed receptions on the plurality of PSFCH reception opportunities, and In response to the number of consecutive failed transmissions over the plurality of PSFCH reception opportunities reaching a threshold, an operation is performed.

38. The wireless communication method of claim 37, wherein performing the HARQ-based sidelink radio link failure detection on the plurality of PSFCH reception opportunities to determine the number associated with the consecutive failed transmissions on the plurality of PSFCH reception opportunities comprises: increasing the number by 1, wherein all receptions on the plurality of PSFCH reception opportunities for the PSSCH do not exist, and The number is set to 0, wherein at least one reception of the plurality of PSFCH reception opportunities for the PSSCH is successful.

39. The wireless communication according to claim 37 or 38, wherein the number of consecutive failed transmissions on the plurality of PSFCH reception opportunities reaches a threshold, and The operations include at least one of the following: Indicates HARQ-based sidelink RLF detection to the radio resource control layer entity, determining that a sidelink RLF is detected for a destination wireless terminal of the PSSCH transmission, releasing at least one data resource bearer of the destination wireless terminal, releasing at least one signaling resource bearer of the destination wireless terminal, releasing at least one PC5 relay radio link control RLC channel of the destination wireless terminal, discarding the configuration of the destination wireless terminal related to the new radio sidelink communication, resetting a sidelink specific MAC layer entity of the destination wireless terminal, or It is determined that a PC5 radio resource control connection is released for the destination wireless terminal.

40. A first wireless terminal, comprising: The processor is configured as: determining a sidelink channel access priority for sidelink transmissions in an unlicensed carrier, and Based on the sidelink channel access priority, a listen-before-talk (LBT) procedure is performed in the unlicensed carrier for the sidelink transmission.

41. The first wireless terminal according to claim 40, wherein the processor is further configured to perform the wireless communication method according to any one of claims 2 to 12.

42. A wireless network node, comprising: The communication unit is configured to send a table indication of a table used to perform a listen-before-talk (LBT) process to a wireless terminal.

43. The radio network node according to claim 42, further comprising a processor, wherein the processor is configured to execute the wireless communication method according to claim 14 or 15.

44. A wireless terminal, comprising: The processor is configured to perform a channel access procedure for sidelink transmission in an unlicensed carrier based on the indication of the channel access procedure type.

45. The wireless terminal according to claim 44, wherein the processor is further configured to execute the wireless communication method according to any one of claims 17 to 19.

46. ​​A wireless network node, comprising: A communication unit is configured to send an indication of a channel access procedure type for a channel access procedure for sidelink transmission in an unlicensed carrier to a wireless terminal.

47. The wireless network node according to claim 46, further comprising a processor configured to perform the wireless communication method according to claim 21.

48. A first wireless terminal, comprising: A communication unit configured to receive a sidelink resource indication from a second wireless terminal, the sidelink resource indication being used to perform a sidelink transmission in an unlicensed carrier after a time slot with an index n, and A processor is configured to perform the sidelink transmission in the unlicensed carrier after the time slot with the index n based on the sidelink resource indication.

49. The first wireless terminal according to claim 48, wherein the processor is further configured to perform the wireless communication method according to any one of claims 23 to 27.

50. A second wireless terminal, comprising: A communication unit is configured to send a sidelink resource indication to a first wireless terminal, wherein the sidelink resource indication is used to allow the first wireless terminal to perform sidelink transmission in an unlicensed carrier after a time slot with an index n.

51. The second wireless terminal according to claim 50, further comprising a processor, wherein the processor is configured to execute the wireless communication method according to any one of claims 29 to 33.

52. A first wireless terminal, comprising: The processor is configured as: For sidelink transmission, a listen-before-talk (LBT) procedure is performed in the unlicensed carrier. determining a result of the LBT process; In response to determining that the result is LBT success, sending a sidelink signal to the second wireless terminal on a channel in the unlicensed carrier, and In response to determining that the result is an LBT failure, an LBT failure indication is sent from a physical layer entity of the first wireless terminal to a medium access control (MAC) layer entity of the first user equipment.

53. The first wireless terminal according to claim 52, wherein the processor is further configured to execute the wireless communication method according to claim 35 or 36.

54. A wireless terminal, comprising: The processor is configured as: determining a plurality of physical sidelink feedback channels PSFCH reception timings for a physical sidelink shared channel PSSCH, performing a hybrid automatic repeat request (HARQ) based sidelink radio link failure (RLF) detection on the plurality of PSFCH reception opportunities to determine a number associated with consecutive failed receptions on the plurality of PSFCH reception opportunities, and In response to the number of consecutive failed transmissions over the plurality of PSFCH reception opportunities reaching a threshold, an operation is performed.

55. The wireless terminal according to claim 54, wherein the processor is further configured to execute the wireless communication method according to claim 38 or 39.

56. A computer program product comprising computer readable program medium code stored thereon, which, when executed by a processor, causes the processor to implement the wireless communication method according to any one of claims 1 to 39.

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