CN117650875A

CN117650875A - Communication method and communication device

Info

Publication number: CN117650875A
Application number: CN202210968012.8A
Authority: CN
Inventors: 易凤; 苏宏家; 卢磊
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-08-12
Filing date: 2022-08-12
Publication date: 2024-03-05
Also published as: WO2024032324A1

Abstract

A communication method and a communication device. The method may include: the first terminal device determines a first channel occupation time COT through channel access; the first terminal device acquires first configuration information, wherein the first configuration information is used for indicating PSFCH period configuration of a sidestream resource pool; the first terminal device determines a first PSFCH time unit set in a first COT according to the first configuration information; the first terminal device sends first side line indication information, and the first side line indication information indicates the second terminal device to send side line feedback information in a second PSFCH time unit set; the second set of PSFCH time units belongs to the first set of PSFCH time units. According to the method, on the basis of PSFCH periodic configuration, the PSFCH time unit activated in COT is indicated and used for feeding back the receiving condition of sidestream transmission, and sidestream transmission reliability is improved.

Description

Communication method and communication device

Technical Field

The embodiments of the present application relate to the field of communications, and more particularly, to a communication method and a communication apparatus.

Background

In a wireless communication system, spectrum resources can be divided into licensed spectrum and unlicensed spectrum. In unlicensed spectrum, terminals may use spectrum resources in a competitive manner. One possible approach is for the terminals to contend for the channel by listen-before-talk (LBT) to use the channel resources. If the terminal LBT is successful, the terminal can use the channel resource to send data; if the terminal LBT fails, the terminal cannot use the channel resource and thus cannot transmit data. Currently, in Sidelink (SL) communication, enabling unlicensed spectrum is an important evolution direction.

In data transmission, a terminal sends data to another terminal, and the other terminal can send feedback information of the data to the terminal according to the receiving condition of the data. In SL unlicensed spectrum communication, how to perform side-by-side feedback is a considerable problem.

Disclosure of Invention

The application provides a communication method and a communication device, which are used for providing a sidestream feedback scheme in SL communication and improving the probability of successful feedback of sidestream feedback information of a terminal device as much as possible.

In a first aspect, a communication method is provided, which may be performed by a terminal device, or may also be performed by a component part (such as a chip or a circuit) of the terminal device, which is not limited in this application. For convenience of description, an example will be described below as being executed by the first terminal apparatus.

The method may include: the first terminal device determines a first channel occupation time COT through channel access; the first terminal device acquires first configuration information, wherein the first configuration information is used for indicating PSFCH period configuration of a sidestream resource pool; the first terminal device determines a first PSFCH time unit set in a first COT according to the first configuration information; the first terminal device sends first side line indication information, and the first side line indication information indicates the second terminal device to send side line feedback information in a second PSFCH time unit set; the second set of PSFCH time units belongs to the first set of PSFCH time units.

Based on the technical scheme, through the method, the first terminal device determines PSFCH time unit period configuration in the resource pool according to the first configuration information, and indicates the PSFCH time unit activated in the first COT on the basis of the PSFCH period configuration, so that the method is used for feeding back the receiving condition of the sidestream transmission and is beneficial to improving the sidestream transmission reliability.

With reference to the first aspect, in certain implementations of the first aspect, PSFCH time units in the first set of PSFCH time units other than the second set of PSFCH time units may be used for PSSCH transmission. Namely, when the PSFCH time unit is in an unavailable or inactive state, the PSFCH time unit is used for sidestream information transmission, and the resource utilization rate is improved.

With reference to the first aspect, in certain implementations of the first aspect, the time units included in the second PSFCH time unit set are time units in an active state in the first PSFCH time unit set.

With reference to the first aspect, in certain implementation manners of the first aspect, the first PSFCH time unit set includes M PSFCH time units, and the first side line indication information is used to indicate activation states of the M PSFCH time units, where M is a positive integer.

Based on the above technical solution, by the method, the first side line indication information indicates an activation state of each time unit in the first PSFCH time unit set, where the PSFCH time units in the activation state form the second PSFCH time unit set.

With reference to the first aspect, in certain implementations of the first aspect, the first PSFCH time unit set includes M PSFCH time units, the first side line indicating information includes L bits, and the L satisfies the following relationship: l= (M _COT *2 ^u )/N _PSFCH Wherein u indicates a subcarrier spacing parameter, N _PSFCH Representing PSFCH time unit period, M _COT Represents the maximum occupation time, N, of the first COT _PSFCH Configured for the first configuration information.

With reference to the first aspect, in certain implementations of the first aspect, the first PSFCH time unit set includes M PSFCH time units, the first side line indicating information includes Q bits, each P bits being used to indicate an activation state of a PSFCH time unit of consecutive k slots, and the P and Q satisfy the following relationship: p=ceil (log 2 (k)); wherein u indicates a subcarrier spacing parameter, N _PSFCH Representing PSFCH time unit period, M _COT Represents the maximum occupation time, N, of the first COT _PSFCH Configured for the first configuration information.

In a second aspect, a communication method is provided, which may be performed by a terminal device, or may also be performed by a component (e.g., a chip or a circuit) of the terminal device, which is not limited in this application. For convenience of description, an example will be described below in which the second terminal apparatus performs.

The method may include: the second terminal device acquires first configuration information; the second terminal device determines a first PSFCH time unit set in a first COT according to the first configuration information; the second terminal device receives first side line indication information from a first terminal device, wherein the first side line indication information indicates that side line feedback information is sent in a second PSFCH time unit set, and the second PSFCH time unit set belongs to the first PSFCH time unit set.

With reference to the second aspect, in certain implementations of the second aspect, the second set of PSFCH time units includes time units that are in an active state in the first set of PSFCH time units.

With reference to the second aspect, in certain implementations of the second aspect, the first PSFCH time unit set includes M PSFCH time units, and the first side line indication information is used to indicate an activation state of the M PSFCH time units, where M is a positive integer.

With reference to the second aspect, in certain implementations of the second aspect, the first PSFCH time unit set includes M PSFCH time units, the first side line indicating information includes L bits, and the L satisfies the following relationship: l= (M _COT *2 ^u )/N _PSFCH Wherein u indicates a subcarrier spacing parameter, N _PSFCH Representing PSFCH time unit period, M _COT Represents the maximum occupation time, N, of the first COT _PSFCH Configured for the first configuration information.

With reference to the second aspect, in certain implementations of the second aspect, the first PSFCH time unit set includes M PSFCH time units, the first side line indicating information includes Q bits, each P bits being used to indicate an activation state of the PSFCH time units of consecutive k slots, and the P and Q satisfy the following relationship: p=ceil (log 2 (k)), wherein u indicates a subcarrier spacing parameter, N _PSFCH Representing PSFCH time unit period, M _COT Represents the maximum occupation time, N, of the first COT _PSFCH Configured for the first configuration information.

In a third aspect, a communication method is provided, which may be performed by a terminal device, or may also be performed by a component part (e.g. a chip or a circuit) of the terminal device, which is not limited in this application. For convenience of description, an example will be described below as being executed by the first terminal apparatus.

The method may include: the first terminal device determines a first side feedback resource corresponding to the first side resource; and under the condition that the first condition is met, the first terminal device sends second information on the first side feedback resource, wherein the second information is used for occupying the first side feedback resource.

With reference to the third aspect, in certain implementations of the third aspect, the first condition includes one of: the first side-line resource is used for the first terminal device to send first side-line information in a blind retransmission mode; the time interval between the first side line resource and the first side line feedback resource is smaller than a first threshold value; the first side resource is used for the first terminal device to transmit broadcast service; the first side-line resource and the first side-line feedback resource are located in a first channel, and the energy detected by the first terminal device in a first time period before the time domain position of the first side-line resource is lower than a second threshold; or the first terminal device does not detect the sidestream control information SCI within a first time period before the time domain position of the first sidestream resource.

With reference to the third aspect, in some implementations of the third aspect, the first sidelink resource is located within a first COT of a first channel; the first COT is determined for the first terminal device or the first COT is shared with the first terminal device for the second terminal device.

With reference to the third aspect, in some implementations of the third aspect, the first side-row feedback resource includes a common side-row feedback resource.

With reference to the third aspect, in some implementations of the third aspect, the first side feedback resource includes a second side feedback resource and a third side feedback resource, where the second side feedback resource is located in the same channel as the first side feedback resource, and the third side feedback resource is located in a different channel from the first side feedback resource, and the first terminal device sends second information on the first side feedback resource, including: and the first terminal device sends second information on the second sidestream feedback resource.

The method may include: the second terminal device determines a first side feedback resource corresponding to a first side resource, wherein the first side feedback information is used for the second terminal device to receive the first side information; and under the condition that the first condition is met, the first terminal device sends third information on the first side feedback resource, wherein the third information is used for occupying the first side feedback resource.

With reference to the fourth aspect, in certain implementations of the fourth aspect, the first condition includes one of: the first side information is sent by a blind retransmission mode; the first side information belongs to a broadcast service.

With reference to the fourth aspect, in some implementations of the fourth aspect, the first side-line resource is located in a first COT of a first channel, and the first side-line resource is shared by other terminal devices to the second terminal device.

With reference to the fourth aspect, in some implementations of the fourth aspect, the first side feedback resource includes a common side feedback resource.

In a fifth aspect, a communication device is provided. The device comprises a processing unit and a receiving and transmitting unit.

A processing unit, configured to determine a first channel occupation time COT through channel access; the receiving and transmitting unit is used for acquiring first configuration information, wherein the first configuration information is used for indicating PSFCH period configuration of the sidestream resource pool; the processing unit is further used for determining a first PSFCH time unit set in the first COT according to the first configuration information; the receiving and transmitting unit is further configured to send first sidestream indication information, where the first sidestream indication information indicates the second terminal device to send sidestream feedback information in the second PSFCH time unit set; the second set of PSFCH time units belongs to the first set of PSFCH time units.

In a sixth aspect, a communication device is provided. The device comprises a processing unit and a receiving and transmitting unit. The receiving and transmitting unit is used for acquiring first configuration information; a processing unit, configured to determine a first PSFCH time unit set in a first COT according to the first configuration information; and the receiving and transmitting unit is further used for receiving first side line indication information from the first terminal device, wherein the first side line indication information indicates that side line feedback information is sent in a second PSFCH time unit set, and the second PSFCH time unit set belongs to the first PSFCH time unit set.

With reference to the fifth and sixth aspects, in some implementations, the PSFCH time units in the first set of PSFCH time units other than the second set of PSFCH time units are available for PSSCH transmission. Namely, when the PSFCH time unit is in an unavailable or inactive state, the PSFCH time unit is used for sidestream information transmission, and the resource utilization rate is improved.

With reference to the fifth and sixth aspects, in some implementations, the second set of PSFCH time units includes time units that are active in the first set of PSFCH time units.

With reference to the fifth and sixth aspects, in some implementations, the first PSFCH time unit set includes M PSFCH time units, and the first side line indication information is used to indicate activation states of the M PSFCH time units, where M is a positive integer.

With reference to the fifth and sixth aspects, in some implementations, the first set of PSFCH time units includes M PSFCH time units, the first side line indicating information includes L bits, and the L satisfies the following relationship: l= (M _COT *2 ^u )/N _PSFCH Wherein u indicates a subcarrier spacing parameter, N _PSFCH Representing PSFCH time unit period, M _COT Represents the maximum occupation time, N, of the first COT _PSFCH Configured for the first configuration information.

With reference to the fifth and sixth aspects, in some implementations, the first PSFCH time unit set includes M PSFCH time units, the first side line indicating information includes Q bits, each P bits being used to indicate an activation state of the PSFCH time units of consecutive k slots, and the P and Q satisfy the following relationship: p=ceil (log 2 (k));wherein u indicates a subcarrier spacing parameter, N _PSFCH Representing PSFCH time unit period, M _COT Represents the maximum occupation time, N, of the first COT _PSFCH Configured for the first configuration information.

In a seventh aspect, a communication device is provided. The device comprises a processing unit and a receiving and transmitting unit. The processing unit is used for determining a first side feedback resource corresponding to the first side resource; and the receiving and transmitting unit is used for transmitting second information on the first lateral feedback resource by the first terminal device under the condition that the first condition is met, wherein the second information is used for occupying the first lateral feedback resource.

With reference to the seventh aspect, in certain implementations, the first condition includes one of: the first side-line resource is used for the first terminal device to send first side-line information in a blind retransmission mode; the time interval between the first side line resource and the first side line feedback resource is smaller than a first threshold value; the first side resource is used for the first terminal device to transmit broadcast service; the first side-line resource and the first side-line feedback resource are located in a first channel, and the energy detected by the first terminal device in a first time period before the time domain position of the first side-line resource is lower than a second threshold; or the first terminal device does not detect the sidestream control information SCI within a first time period before the time domain position of the first sidestream resource.

With reference to the seventh aspect, in some implementations, the first sidelink resource is located within a first COT of a first channel. The first COT is determined for the first terminal device or the first COT is shared by the second terminal device to the first terminal device.

With reference to the seventh aspect, in some implementations, the first side-row feedback resource includes a common side-row feedback resource.

In an eighth aspect, a communication device is provided. The device comprises a processing unit and a receiving and transmitting unit. The processing unit is used for determining first side feedback resources corresponding to the first side resources, and the first side feedback information is used for the second terminal device to receive the first side information; and the receiving and transmitting unit is used for transmitting third information on the first side feedback resource under the condition that the first condition is met, wherein the third information is used for occupying the first side feedback resource.

With reference to the eighth aspect, in certain implementations, the first condition includes one of: the first side information is sent by a blind retransmission mode; the first side information belongs to a broadcast service.

In a ninth aspect, a communication method is provided, which may be performed by a terminal device, or may also be performed by a component (e.g., a chip or a circuit) of the terminal device, which is not limited in this application. For convenience of description, an example will be described below as being executed by the first terminal apparatus.

The tenth aspect may refer to the related design in the first aspect, and the beneficial effects of the ninth aspect may refer to the related description in the first aspect, which is not repeated herein.

An eleventh aspect provides a communication device for performing the method of any one of the possible implementations of the first to fourth aspects. In particular, the apparatus may comprise means and/or modules, such as a processing unit and/or a communication unit, for performing the method in any of the possible implementations of the first to fourth aspects.

In one implementation, the apparatus is a terminal device. When the apparatus is a terminal device, the communication unit may be a transceiver, or an input/output interface; the processing unit may be at least one processor. Alternatively, the transceiver may be a transceiver circuit. Alternatively, the input/output interface may be an input/output circuit.

In another implementation, the apparatus is a chip, a system-on-chip or a circuit for a terminal device. When the apparatus is a chip, a system-on-chip or a circuit for a terminal device, the communication unit may be an input/output interface, an interface circuit, an output circuit, an input circuit, a pin or a related circuit, etc. on the chip, the system-on-chip or the circuit; the processing unit may be at least one processor, processing circuit or logic circuit, etc.

In a twelfth aspect, there is provided a communication apparatus comprising: at least one processor configured to execute a computer program or instructions stored in a memory to perform a method according to any one of the possible implementations of the first to fifth aspects. Optionally, the apparatus further comprises a memory for storing a computer program or instructions. Optionally, the apparatus further comprises a communication interface through which the processor reads the computer program or instructions stored in the memory.

In one implementation, the apparatus is a terminal device.

In another implementation, the apparatus is a chip, a system-on-chip or a circuit for a terminal device.

In a thirteenth aspect, the present application provides a processor for performing the methods provided in the first to fifth aspects above.

The operations such as transmitting and acquiring/receiving, etc. related to the processor may be understood as operations such as outputting and receiving, inputting, etc. by the processor, or may be understood as operations such as transmitting and receiving by the radio frequency circuit and the antenna, if not specifically stated, or if not contradicted by actual function or inherent logic in the related description, which is not limited in this application.

In a fourteenth aspect, a computer readable storage medium is provided, the computer readable medium storing program code for execution by a device, the program code comprising instructions for performing the method of any one of the possible implementations of the first to fifth aspects.

In a fifteenth aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of any one of the possible implementations of the first to fifth aspects described above.

A sixteenth aspect provides a communication system comprising at least one of the first and second terminal devices described above.

Drawings

Fig. 1 shows a schematic diagram of a wireless communication system suitable for use in an embodiment of the present application.

Fig. 2 shows a schematic diagram of a wireless communication system suitable for use in another embodiment of the present application.

Fig. 3 is a schematic diagram of PSFCH configuration provided in an embodiment of the present application.

Fig. 4 is a schematic diagram of a communication method according to an embodiment of the present application.

Fig. 5 is a schematic diagram of PSFCH time unit indication provided in an embodiment of the present application.

Fig. 6 is a schematic diagram of another PSFCH time unit indication provided in an embodiment of the present application.

Fig. 7 is a schematic diagram of still another PSFCH time unit indication provided in an embodiment of the present application.

Fig. 8 is a schematic diagram of still another PSFCH time unit indication provided in an embodiment of the present application.

Fig. 9 is a schematic diagram corresponding to PSSCH and PSFCH provided in an embodiment of the present application.

Fig. 10 shows a schematic diagram of one PSSCH corresponding to a plurality of PSFCH time units.

Fig. 11 shows a schematic diagram of a common PSFCH resource.

Fig. 12 shows a schematic diagram of a common PSFCH resource.

Fig. 13 shows a schematic diagram of a common PSFCH resource.

Fig. 14 shows a schematic diagram of a communication device 1400.

Fig. 15 shows a schematic diagram of a communication device 1500.

Detailed Description

The technical solutions in the present application will be described below with reference to the accompanying drawings.

The technical solutions provided in the embodiments of the present application may be applied to various communication systems, such as a 5G (fifth generation (5th generation,5G) or New Radio (NR) system, a long term evolution (long term evolution, LTE) system, an LTE frequency division duplex (frequency division duplex, FDD) system, an LTE time division duplex (time division duplex, TDD) system, etc., the technical solutions provided in the present application may also be applied to future communication systems, such as a sixth generation mobile communication system.

In addition, the technical solution provided in the embodiments of the present application may be applied to a link between a network device and a terminal device, and may also be applied to a link between devices, for example, a device to device (D2D) link. The D2D link may also be referred to as a sidelink, which may also be referred to as a side link, a sidelink, etc. In the embodiment of the present application, the D2D link, or the side link, refers to a link established between devices of the same type, and the meanings of the links are the same. The same type of device may be a link between terminal devices, a link between network devices, a link between relay nodes, or the like, which is not limited in the embodiment of the present application. For the link between the terminal equipment and the terminal equipment, there is a D2D link defined by release (Rel) -12/13 of the third generation partnership project (3rd generation partnership project,3GPP), and also a internet of vehicles link defined by 3GPP for the internet of vehicles. It should be appreciated that V2X specifically includes vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-pedestrian (V2P) direct communication, and vehicle-to-network (V2N) or V2X links of a vehicle to any entity, including Rel-14/15. V2X also includes Rel-16, which is currently under study by 3GPP, and subsequent releases of V2X links based on NR systems, and the like. V2V refers to communication between vehicles; V2P refers to vehicle-to-person (including pedestrians, cyclists, drivers, or passengers) communication; V2I refers to the communication of the vehicle with an infrastructure, such as a Road Side Unit (RSU) or a network device, and a further V2N may be included in the V2I, V2N refers to the communication of the vehicle with the network device. Among them, RSUs include two types: the terminal type RSU is in a non-moving state because the terminal type RSU is distributed at the roadside, and mobility does not need to be considered; the base station type RSU may provide timing synchronization and resource scheduling for vehicles with which it communicates.

Architecture diagrams of mobile communication systems applied in embodiments of the present application. As shown in fig. 1, fig. 1 is a schematic architecture diagram of a communication system 1000 to which an embodiment of the present application applies. As shown in fig. 1, the communication system comprises a radio access network 100, optionally, the communication system 1000 may further comprise a core network 200 and the internet 300. The radio access network 100 may include at least one radio access network device (e.g., 110a and 110b in fig. 1) and may also include at least one terminal (e.g., 120a-120j in fig. 1). The terminal is connected with the wireless access network equipment in a wireless mode, and the wireless access network equipment is connected with the core network in a wireless or wired mode. The core network device and the radio access network device may be separate physical devices, or may integrate the functions of the core network device and the logic functions of the radio access network device on the same physical device, or may integrate the functions of part of the core network device and part of the radio access network device on one physical device. The terminals and the radio access network device may be connected to each other by wired or wireless means. Fig. 1 is only a schematic diagram, and other network devices may be further included in the communication system, for example, a wireless relay device and a wireless backhaul device may also be included, which are not shown in fig. 1.

It should be understood that, in the communication system of the present application, the information transmitting end may be a network device, or may be a terminal device, and the information receiving end may be a network device, or may be a terminal device, which is not limited in this application.

In the embodiments of the present application, a User Equipment (UE) may be referred to as a terminal device, a terminal apparatus, an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a User terminal, a wireless communication device, a User agent, or a User apparatus.

The terminal device may be a device that provides voice/data to a user, e.g., a handheld device with wireless connection, an in-vehicle device, etc. The terminal devices may include user equipment, sometimes referred to as terminals, access stations, UE stations, remote stations, wireless communication devices, or user equipment, among others. The terminal device is used for connecting people, objects, machines and the like, and can be widely used in various scenes, including but not limited to the following scenes: cellular communication, D2D, V X, machine-to-machine/machine-type communications, M2M/MTC), internet of things (internet of things, ioT), virtual Reality (VR), augmented reality (augmented reality, AR), industrial control (industrial control), unmanned driving (self driving), remote medical (remote media), smart grid (smart grid), smart furniture, smart office, smart wear, smart transportation, smart city (smart city), unmanned aerial vehicle, robotic, and other end devices. For example, the terminal device may be a mobile phone (mobile phone), a tablet pc (Pad), a computer with a wireless transceiver function, a VR terminal, an AR terminal, a wireless terminal in industrial control, an entire car, a wireless communication module in the entire car, an on-board T-box (Telematics BOX), a road side unit RSU, a wireless terminal in unmanned driving, a smart speaker in IoT network, a wireless terminal device in telemedicine, a wireless terminal device in smart grid, a wireless terminal device in transportation security, a wireless terminal device in smart city, a wireless terminal device in smart home, or the like, which is not limited in the embodiment of the present application.

By way of example, and not limitation, in embodiments of the present application, the terminal device may also be a wearable device. The wearable device can also be called as a wearable intelligent device, and is a generic name for intelligently designing daily wear by applying wearable technology and developing wearable devices, such as glasses, gloves, watches, clothes, shoes and the like. The wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also can realize a powerful function through software support, data interaction and cloud interaction. The generalized wearable intelligent device includes full functionality, large size, and may not rely on the smart phone to implement complete or partial functionality, such as: smart watches or smart glasses, etc., and focus on only certain types of application functions, and need to be used in cooperation with other devices, such as smart phones, for example, various smart bracelets, smart jewelry, etc. for physical sign measurement. In addition, in the embodiment of the application, the terminal device may also be a terminal device in an IoT system, where IoT is an important component of future information technology development, and the main technical feature is to connect the article with a network through a communication technology, so as to implement man-machine interconnection and an intelligent network for interconnecting the articles.

The various terminal devices described above, if located on a vehicle (e.g., placed in a vehicle or installed in a vehicle), may be considered as in-vehicle terminal devices, also referred to as in-vehicle units (OBUs), for example. The terminal device of the present application may also be an in-vehicle module, an in-vehicle component, an in-vehicle chip, or an in-vehicle unit that is built in a vehicle as one or more components or units, and the vehicle may implement the method of the present application through the in-vehicle module, the in-vehicle component, the in-vehicle chip, or the in-vehicle unit.

It should be appreciated that the network device in the wireless communication system may be a device capable of communicating with the terminal device, which may also be referred to as an access network device or a radio access network device, e.g. the network device may be a base station. The network device in the embodiments of the present application may refer to a radio access network (radio access network, RAN) node (or device) that accesses the terminal device to the wireless network. The base station may broadly cover or replace various names in the following, such as: a node B (NodeB), an evolved NodeB (eNB), a next generation NodeB (gNB), a relay station, an access point, a transmission point (transmitting and receiving point, TRP), a transmission point (transmitting point, TP), a master eNodeB (MeNB), a secondary eNodeB (SeNB), a multi-mode radio (multi standard radio, MSR) node, a home base station, a network controller, an access node, a radio node, an Access Point (AP), a transmission node, a transceiver node, a baseband unit (BBU), a radio remote unit (remote radio unit, RRU), an active antenna unit (active antenna unit, AAU), a radio head (remote radio head, RRH), a Central Unit (CU), a Distributed Unit (DU), a positioning node, and the like. The base station may be a macro base station, a micro base station, a relay node, a donor node, or the like, or a combination thereof. A base station may also refer to a communication module, modem, or chip for placement within the aforementioned device or apparatus. The base station may be a mobile switching center, a device that performs a base station function in D2D, V2X, M M communication, a network side device in a 6G network, a device that performs a base station function in a future communication system, or the like. The base stations may support networks of the same or different access technologies. The embodiment of the application does not limit the specific technology and the specific device form adopted by the network device.

In the embodiments of the present application, the functions of the base station may be performed by a module (such as a chip) in the base station, or may be performed by a control subsystem including the functions of the base station. The control subsystem comprising the base station function can be a control center in the application scenarios of smart power grids, industrial control, intelligent transportation, smart cities and the like. The functions of the terminal may be performed by a module (e.g., a chip or a modem) in the terminal, or by a device including the functions of the terminal.

For ease of understanding the present application, a simple description of the random access procedure and related concepts is provided.

1. An interface: the communication interface (Uu interface) between the terminal apparatus and the network appliance may be referred to as a Uu interface, the communication interface (PC 5 interface) between the terminal apparatus and the terminal apparatus may be referred to as a PC5 interface, and a transmission link in the PC5 interface is defined as a Sidelink (SL). The terminal device in the present application may be understood as the above-mentioned terminal device, or a part of the modules/chips in the terminal device.

2. Unlicensed band (unlicensed spectrum): in a wireless communication system, the frequency bands may be classified into an authorized frequency band and an unauthorized frequency band according to the frequency bands used. In the licensed band, users use spectrum resources based on the scheduling of the central node. In unlicensed bands, the transmitting node needs to use spectrum resources in a contention manner, specifically, contend for the channel by listen-before-talk (LBT) manner. The LBT mechanism is essentially a random back-off (random back-off) based channel access rule. The UE needs to perceive (sense) whether the channel is idle or not before accessing the channel and starting to transmit data, and can occupy the channel if the channel has remained idle for a certain time, and can occupy the channel if the channel is not idle, and needs to wait for the channel to resume to idle again. In a 5G NR system, NR protocol technologies in an unlicensed band are collectively referred to as NR-U, and further enhancement of communications performance of a corresponding Uu interface by using the NR-U is expected. SL communication that enables unlicensed bands in local space is an important evolution direction, and corresponding protocol technologies may be collectively referred to as SL-U. Similar to the Uu interface, a UE operating through SL-U also needs to coexist with nearby Wi-Fi devices based on LBT mechanisms. The LBT mechanism is an essential feature of unlicensed bands because of regulatory requirements for use of unlicensed bands in various regions of the world. UEs operating in various forms of different communication protocols can use unlicensed frequency bands only if the regulations are satisfied, and thus use spectrum resources relatively fairly and efficiently.

3. Side uplink resource allocation mode: NR SL supports two resource allocation schemes, namely mode 1 and mode 2.

Mode 1 (SL mode 1) the resources used by the network device for the sidelink transmission are allocated, mode one is typically used for sidelink communications within the coverage of the network device. Taking the dynamic scheduling of transmission resources by the network device in the mode 1 as an example, the network device performs resource allocation according to the reporting (buffer status report, BSR) condition of the buffer status of the UE. Specifically, the network device indicates time-frequency resources to UE1 through downlink control information (downlink control information, DCI), and UE1 is a UE that is a transmitting end in both communication parties. After receiving the DCI, UE1 transmits side control information (sidel ink control information, SCI) and data to UE2 on the time-frequency resource indicated by the DCI, and UE2 is a UE that is a receiving end in both communication parties. In mode 1, the sidestream transmission resources of each UE are scheduled by the network device in a unified manner, so that collision can be avoided.

Mode 2 (SL mode 2) the resources used by the UE to autonomously select the side uplink transmission.

4. LBT: LBT is a random back-off (random back-off) based channel access rule. The UE perceives whether the (sense) channel is idle or not before accessing the channel and starting to transmit data. The channel may be occupied if it has remained idle for a certain time, and may be occupied if it is not idle, waiting for the channel to resume idle. One possible implementation employs energy-based detection and signal type detection to determine whether a channel is idle. Taking the detection of energy as an example, when the detected energy exceeds a detection threshold, it is determined that the channel is busy, i.e. access to the channel is not allowed. When the detected energy is lower than the detection threshold and lasts for a period of time, the channel is judged to be idle, and the channel is allowed to be accessed.

As an example, the UE performs LBT on each 20MHz channel. To avoid interference of different channels, the UE does not transmit data over the entire 20MHz bandwidth, but leaves a part of band resources as guard band (guard band), and transmits data in the remaining frequency domain resources, which may be referred to as a resource block set (RB set). When the UE performs LBT operation on a plurality of consecutive 20MHz channels and successfully accesses the channels, guard bandwidths between RBs set can be used to transmit data, improving resource utilization. In the embodiment of the present application, LBT channels, and RBs set are sometimes used alternately.

Unlicensed spectrum resources may be shared between UEs. For example, if a certain UE obtains channel usage rights through LBT, the UE may occupy the channel for a period of time, which may be referred to as channel occupancy time (channel occupancy time, COT); the UE may share the channel usage rights in the COT to other devices, that is, the UE may share the resources shared in the COT, including time domain resources and frequency domain resources, to other devices; other devices may send data over resources shared by the UE.

As an example, LBT mechanisms are generally divided into four classes as follows.

LBT (category 1LBT, cat 1 LBT) of the type: immediately after a short switching gap (switching gap) for the communication device to immediately transmit after a switching gap from the receive state to the transmit state in the COT. Wherein the time of the switching interval generally cannot be greater than 16us.

Two types of LBT (Category 2LBT, cat 2 LBT): the LBT without random back-off is used for the communication device to transmit without random back-off after listening that the channel is in idle state for a certain time.

Three types of LBT (Category 3LBT, cat 3 LBT): an LBT with random backoff of a fixed-size contention window (contention window) for a communication device to generate a random number N based on the fixed-size contention window and to transmit after listening that the channel is in an idle state for a period of time determined based on the random number N. Wherein the size of the contention window is related to the minimum and maximum values of N.

Four types of LBT (Category 4LBT, cat 4 LBT): the LBT with random backoff of a variable-size contention window is used for the communication device to generate a random number N based on the variable-size contention window and to transmit after listening that the channel is in an idle state for a period of time determined based on the random number N. Wherein the size of the contention window is related to the minimum and maximum values of N, the communication device may change the size of the contention window.

NR-U device follows 3GPP protocol, and adopts LBT mechanism as channel access method. Specifically, NR-U devices use several types of LBT as follows.

Type 1LBT: cat 4LBT. The NR-U device needs to perform a random backoff before accessing the channel and transmitting data. In particular, the network device or terminal device may transmit data over an extended duration (refer to this time as T) _d ) After the first listening slot period (sensing slot duration) when the listening channel is idle and after the counter N is zero in step 4 below, a transmission is initiated. Specifically, the counter N is adjusted by listening to the channel for additional listening slot periods according to the following steps.

Step 1: setting n=n _init Step 4 is then performed. Wherein N is _init Is in the range of 0 to CW _p Random number, CW of (2) _p Is a contention window (contention window).

Step 2: if N >0, the network device or the terminal device chooses to decrease the counter value, e.g. set n=n-1.

Step 3: listening to the channel for an additional listening slot period, if the channel of the additional listening slot period is idle, performing step 4; otherwise, step 5 is performed.

Step 4: stopping if n=0; otherwise, step 2 is performed.

Step 5: listening to the channel until at another T _d In detecting that the channel is busy or detecting another T _d All listening slots within are detected as channel idle.

Step 6: if at another T _d Detecting that the interception time slots in the channel are idle, and executing the step 4; otherwise, step 5 is performed.

T as described above _d Includes T _f =16us and subsequent consecutive m _p Each successive listening slot period (denoted as T _sl )。m _p See table 1 for values of (c). Wherein CW is _min,p For the contention window minimum, CW _max,p For the maximum value of the contention window, W _min,p ≤CW _p ≤CW _max,p 。T _mcot,p For maximum length of COT, i.e. COT transmitted by network device or terminal device on channel not exceeding T _mcot,p 。

TABLE 1

Type 2A LBT: cat 2 LBT at 25us intervals. The NR-U device may access the channel and transmit data after listening to the channel idle 25 us.

Type 2B LBT: cat 2 LBT at 16us intervals. The NR-U device may access the channel and transmit data after listening to the channel idle 16 us.

Type 2C LBT: cat 1 LBT at intervals of up to 16 us. The NR-U device does not need to listen to the channel and can directly access the channel and transmit data after a transition interval of up to 16us in the COT.

5. Interleaving: the protocol defines interleaved resource blocks (interlaces of resource block), hereinafter referred to as interleaving. Interlace M may be composed of common resource blocks (common resource block, CRB) { M, m+m,2m+m, 3m+m. Where M is the number of interlaces and there is M ε {0, 1..M-1 }. Optionally, the value of M relates to a sub-carrier space (SCS). For example, when μ=0 (i.e., the subcarrier spacing is 15 kHz), M takes a value of 10. For another example, when μ=1 (i.e., the subcarrier spacing is 30 kHz), M takes a value of 5.

6. SL communication resource pool: SL communication may be based on resource pool (resource pool). The resource pool refers to a block of time-frequency resources dedicated for SL communication; or a resource pool may also be understood as a set of resources that may be used for SL communication, i.e. a set of time domain resources and frequency domain resources for SL communication.

The resource pool used for SL communication may be simply referred to as a resource pool, or may also be referred to as a SL resource pool. The resource pool is described below for brevity. The resource pool may also be referred to as a channel (channel), an operating channel (Operating channel), a nominal channel (nominal channel bandwidth) bandwidth (bandwidth). I.e. resource pool, channel, bandwidth are all used to represent the set of resources that can be used for SL communication. The naming of the resource pool is not limited.

For time domain resources within the resource pool, as an example, the network device may employ a bit map (bitmap) and repeat the bitmap periodically to indicate a set of subframes for SL communication among all subframes of the system.

Fig. 3 (a) shows a schematic diagram of an available subframe indicating SL communication by bitmap. As shown in fig. 3 (a), the bitmap has a length of 8 bits (bits). The number of symbols occupied by SL communication in each subframe is M, and M is an integer greater than or equal to 1. M may be considered as one SL time domain transmission duration or time domain transmission unit.

For frequency domain resources within the resource pool, as an example, the network device may divide the frequency band for SL communication into several sub-channels, each sub-channel containing a number of resource blocks.

Fig. 3 (b) shows a schematic diagram of frequency domain resources within a resource pool. As shown in fig. 3 (b), the network device may indicate the following parameters: frequency resources for SL communicationA sequence number of a first resource block, a total number N of sub-channels contained in the resource pool, and a number N of resource blocks contained in each sub-channel _CH . One SL transmission may occupy one or more sub-channels. In scheduling the resources for SL communication, scheduling may be performed with sub-channel granularity in the frequency domain.

7. Physical sidelink feedback channel (physical side link feedback channel, PSFCH) resources: the PSFCH resource means a resource for transmitting the PSFCH. As an example, one PSFCH occupies 2 consecutive OFDM symbols in the time domain, and the frequency domain is 1 PRB.

As one possible scenario, the PSFCH may be used to transmit feedback information. For example, for a physical side shared channel (physical side link share channel, PSSCH) transmission, if the transmitting end carries hybrid automatic repeat request acknowledgement (hybrid automatic repeat request acknowledgment, HARQ-ACK) feedback enable information in the control information, the receiving end may feedback corresponding Acknowledgement (ACK) or negative (negative acknowledgement, NACK) information according to the decoding result of the PSSCH. Wherein ACK or NACK information is transmitted over the PSFCH.

It is to be understood that the foregoing is illustrative and not restrictive. For example, PSFCH may also be used for inter-user-UE coordination (inter-UE coordination) Scheme2 (Scheme 2) collision indication. That is, if the PSFCH resource is configured in the resource pool, the PSFCH resource may be used to transmit some kind of information, such as feedback information, e.g., ACK/NACK, and collision indication; or may transmit one type of information in part and another type of information in part, such as in part for feedback information and in part for Scheme2 collision indication, without limitation.

The PSFCH resource may be a periodic resource configured in a resource pool. For example, assume that the period parameter isAs an example, a->The values of (2) may be 0, 1, 2, 4. If->It indicates that there are no PSFCH resources in the resource pool, i.e., the resources in the resource pool are not available for transmission of PSFCH. If->It means that in the resource pool every +.>There will be one PSFCH resource for each SL slot.

Fig. 3 (c) shows a schematic diagram of the PSFCH resource configuration in the resource pool. As shown in FIG. 3 (c), if the PSFCH period is 1, i.eThere will be one PSFCH resource per 1 SL slot within one time window. If PSFCH period is 2, i.e. +.>There will be one PSFCH resource per 2 SL slots within a time window. If the PSFCH period is 4, i.e. +. >There will be one PSFCH resource every 4 SL slots within a time window.

As can be seen from fig. 3 (c), if PSFCH resources are allocated on the resource pool, then each timeThe PSFCH resource is configured once per slot. The following briefly describes the steps for determining the PSFCH resources for each subchannel. The steps described below are exemplary, and are not limited in this application.

Step 1: the resource pool is configured with a bitmap of PSFCH frequency domain resources, and the bitmap is used for indicating whether PRB on the frequency domain resources where the resource pool is located can be used as PSFCH resources.

The bit information length contained in the bitmap is equal to the number of PRBs in the resource pool. The PRB corresponding to the bit value "1" in the bitmap may be used to transmit the PSFCH, and the PRB corresponding to the bit value "0" in the bitmap may not be used to transmit the PSFCH. Further, if the PSFCH resource is used for transmitting HARQ-ACK, the PSFCH resource may be represented by a "sl-PSFCH-RB-Set" bitmap, that is, a PRB corresponding to a bit value of "1" in the bitmap may be used for transmitting HARQ-ACK, and a PRB corresponding to a bit value of "0" in the bitmap may not be used for transmitting HARQ-ACK. If the PSFCH resource is used for the Scheme2 conflict indication, the PSFCH resource can be represented by a 'sl-RB-SetPSFCH' bitmap, namely, PRBs corresponding to the bit value of '1' in the bitmap can be used for the Scheme2 conflict indication, and PRBs corresponding to the bit value of '0' in the bitmap can not be used for the Scheme2 conflict indication. As an example, the positions of bit values 1 in "sl-PSFCH-RB-Set" and "sl-RB-SetPSFCH" do not overlap, so that the same position can be avoided for transmitting both HARQ-ACK and Scheme2 collision indication.

Fig. 3 (d) shows another schematic diagram of the PSFCH resource configuration in the resource pool. As shown in (d) of fig. 3, assuming that one sub-channel includes 10 PRBs and there are 3 sub-channels in the SL resource pool, the bitmap indicating the PSFCH frequency domain resource in the SL resource pool includes 3×10=30 bits in total to indicate whether each PRB can be used for transmitting the PSFCH. The bitmap can be used for indicating HARQ-ACK resources and also can be used for indicating scheme2 conflict indication resources. Taking the example shown in fig. 3 (d) as an example, the bitmap indicates that the first 4 PRBs of a partial subchannel may be used for transmission of PSFCH, the first 2 PRBs of a partial subchannel may be used for transmission of PSFCH, and the middle 2 PRBs of a partial subchannel may be used for transmission of PSFCH.

Step 2: and determining the PSFCH resource quantity corresponding to each sub-channel. For example, due to eachOne PSSCH slot corresponds to one PSFCH slot, for containing N _subch For the resource pool of sub-channels, the PSFCH resource amount corresponding to each sub-channel is +.>Wherein (1)>The number of PRBs representing the PSFCH frequency domain resource, i.e., the sum of the number of bits indicating 1 in the bitmap of the PSFCH frequency domain resource.

Step 3: the time domain position of the PSFCH is determined. Considering the decoding capability of the receiving end, the receiving end cannot immediately feed back after receiving the PSSCH, so the standard defines a time interval K for PSSCH feedback, that is, the PSSCH transmits the PSFCH on the first available slot containing the PSFCH resource, where the slot is at least K slots apart from the slot in which the PSSCH is located.

Fig. 3 (e) shows a schematic diagram of PSSCH corresponding to PSFCH time domain resources. As shown in fig. 3 (e), when k=2, the PSSCHs carried on slots 0 and 1 may be fed back on the PSFCH resource on slot 3, and the PSSCHs carried on slots 2, 3, 4, 5 are fed back on the PSFCH resource on which slot 7 is located. Since slots 2, 3, 4, 5 are fed back on the PSFCH resource of one slot, slots 2, 3, 4, 5 may also be referred to as one PSSCH bundling window length.

Step 4: the PSFCH available resources in one PSFCH feedback slot are allocated sequentially to each subchannel in the feedback period in a time-first-frequency-domain manner.

Fig. 3 (f) shows a schematic diagram of PSFCH frequency domain resource allocation. As shown in fig. 3 (f), after receiving the PSSCH, the terminal may feed back the PSFCH, and the time interval between the PSSCH and the PSFCH is K. When (when)When the PSFCH resources corresponding to each sub-channel in the 4 bonded PSSCH time slots are shown as numbers in the figure, namely, PSFCH resources of one PRB are allocated to each sub-channel of each time slot. Expressed by the formula: for->If the frequency sub-channel number in the resource pool of the ith time slot in the binding PSSCH time slots is j, the corresponding PSFCH resource is:if the terminal occupies two sub-channel transmissions, as shown by the black square in fig. 3 (f), the corresponding PSFCH resources are also 5 and 9, respectively, and are discontinuous in the frequency domain.

In order to facilitate understanding of the information transmission method provided in the following embodiments of the present application, first, related concepts related to the following embodiments will be described:

terminal) device sharing COT, it can be understood that: the terminal device shares part of the time-frequency resources within the COT to other terminal devices.

The time-frequency resources within the COT may include: the time domain position is located in the COT, and the frequency domain position is located in the resource in the channel corresponding to the COT. The channel corresponding to the COT is a channel preempted (or accessed) by the terminal equipment through the LBT, and the COT is the occupied time (or using time) of the channel preempted (or accessed) by the terminal equipment.

Preempting resources: for a certain terminal device, the preempting resource refers to a time-frequency resource in the COT corresponding to the channel preempted by the terminal device.

Shared resources: for a certain terminal device, the shared resource refers to a time-frequency resource in the COT of the other terminal device shared by the other terminal device to the terminal device.

The PSFCH time unit in the following embodiments may also be understood as a PSFCH resource. Specifically, the method is a time domain resource for transmitting side line feedback information.

The application provides a PSFCH resource allocation method in a SL-U scene, which is used for allocating side line feedback resources. By the method, PSFCH resources are configured for COT, and accuracy of transmission of lateral information under SL-U scenes is improved.

401. The first terminal device determines a first COT through channel access.

The first terminal device determines a first COT through the LBT. The channel corresponding to the first COT may be referred to as a first channel. The first COT may be understood as a period of transmission opportunity, and a time length corresponding to the transmission opportunity and capable of continuously transmitting information may be referred to as a channel occupation time COT.

The specific LBT procedure may be referred to above.

402. The first terminal device acquires first configuration information.

The first configuration information is used for indicating PSFCH period configuration in the sidestream resource pool.

The first configuration information is information received from the base station or the first configuration information is predefined information. For example, the first terminal device may obtain the PSFCH configuration through RRC signaling, i.e. the first configuration information is carried in RRC signaling. For example, the first configuration information may include "sl-PSFCH-Period" signaling from which the PSFCH-Period configuration within the resource pool may be determined, e.g., by the first configuration information

Optionally, the first COT is located in a sidestream resource pool.

403. The first terminal device may determine a first set of PSFCH time units located within the first COT according to the first configuration information. Or, the first terminal device determines a first PSFCH time unit set according to the first configuration information, where a time unit in the first PSFCH time unit set is a set of PSFCH time units located in the first COT.

The PSFCH time unit may be understood as a time unit that may be used for feeding back side row feedback information, and a specific time length may be a time slot, a mini-slot, a number of symbols, or the like. For example, one PSFCH time unit is one slot, or one PSFCH time unit is one mini-slot, or 2 symbols.

404. The first terminal device transmits first sidestream indication information, and the first sidestream indication information instructs the second terminal device to transmit sidestream feedback information in the second PSFCH time unit set.

The first side line indication information has the following realization forms: the first side row indication information indicates a second set of PSFCH time units. Alternatively, the first indication information indicates time units of an available or active state in the first set of PSFCH time units. Alternatively, the first side row indication information indicates an activation state of each time cell in the first set of PSFCH time cells, wherein the PSFCH time cells in the activation state form the second set of PSFCH time cells.

The second set of PSFCH time units includes time units that are active in the first set of PSFCH time units. That is, the second set of PSFCH time units is a set of PSFCH time units that are active within the first COT. The active PSFCH time unit may also be understood as an available time unit, i.e. a time unit that may be used for the second terminal device to send side feedback information.

The second set of PSFCH time units belongs to the first set of PSFCH time units. The PSFCH time units in the second set of PSFCH time units are those time units of the first set of PSFCH time units that are within the first COT and available/active. It may be appreciated that the first PSFCH time unit set is a candidate time unit in the resource pool configured in the first COT, where whether the PSFCH time unit is actually sending side feedback information is uncertain.

The first side row indication information is used to indicate an activation state of each time cell in the first PSFCH time cell set. Alternatively, the first side row indication information indicates whether PSFCH time is available in the set of time units.

The sidestream feedback information is carried on the PSFCH, and the transmitting sidestream feedback information may also be referred to as transmitting the PSFCH.

The second set of PSFCH time units includes active PSFCH time units within the first COT for feeding back transmission of inner row information of the first COT. The transmission case includes one of the following: the transmission/decoding of the side line information is correct, and the transmission/decoding of the side line information is wrong.

Correspondingly, the second terminal device determines that the sidestream feedback information can be sent on the second PSFCH time unit set according to the first sidestream indication information.

Wherein the second set of PSFCH time units is an activation state of a PSFCH time unit in the first COT. The second set of PSFCH time units belongs to a first set of PSFCH time units, the first set of PSFCH time units being a set of PSFCH time units in the side row resource pool.

Optionally, the second terminal device determines a first PSFCH time unit set in the sideline resource pool according to the first configuration information. Specifically, the second terminal device receives the first configuration information from the base station side or the first configuration information is predefined.

The second terminal device is a receiving end of the sidestream information sent by the first terminal device, that is, the second terminal device receives the sidestream information from the first terminal device on a PSSCH time unit in the first COT, and the second terminal device feeds back the transmission condition of the sidestream information to the first terminal device on a PSFCH time unit in the first COT. Or the second terminal device is not the receiving end of the first terminal device, and the second terminal device receives the sidestream information on the sidestream resources in the first COT.

Optionally, the sending time of the first side line indication information is located in the first few time slots in the first COT, for example, the first side line indication information is sent in the first time slot in the first COT. In this way, other terminal devices can determine the position of the PSFCH time unit as early as possible, and avoid affecting the transmission of sidestream information or sidestream feedback information.

The first side line indication information is carried in the SCI or MAC CE. Wherein when the first side line indication information is carried in the SCI, the SCI may be a first level SCI or the SCI may be a second level SCI.

Other terminal devices around the first terminal device may receive the first side line indication information to determine an available condition or an active state of a PSFCH time unit in the PSFCH time unit set in the first COT. For example, the first terminal device is UE1, the first COT is COT1, the second terminal device is UE2, and UE1 preempts COT1 and sends first side information through SCI in the first time slot in the COT1, indicating the activation state of the PSFCH time unit in the first COT. Optionally, the second terminal device determines a first PSFCH time unit set in the first COT according to the first configuration information. The activation status of time cells in the first set of PSFCH time cells is then determined based on the first side indication information from the first terminal device.

Optionally, the method may further include: 405. the first terminal device receives side line feedback information from the second terminal device on a first PSFCH time unit, the first PSFCH time unit being a PSFCH time unit in a first set of PSFCH time units, and the first PSFCH time unit being a time unit in a second set of PSFCH time units indicated by the first side line indication information, or being an available PSFCH time unit. The first PSFCH time unit corresponds to a resource of the second terminal apparatus that receives the side row information. For example, the second terminal device receives first side information from the first terminal device on a first side resource, the first side resource corresponding to a first PSFCH time unit.

The second terminal device determines a second PSFCH time unit set according to the first side line indication information, and the first PSFCH time unit corresponding to the first side line transmission resource belongs to the second PSFCH time unit set. I.e. the first PSFCH time unit is an available/active time unit, and the second terminal device feeds back side feedback information on the first PSFCH time unit. Wherein the correspondence of the first PSFCH time unit and the first sidelink transmission resource may be determined for predefined or other configuration information.

In step 405, when the second terminal device and the first terminal device are a set of communication pairs, that is, the second terminal device receives sidestream information from the first terminal device on sidestream resources in the first COT. When the second terminal device is other, the following other cases are possible in step 405.

The second terminal device sends sidestream information to the first terminal device on the first COT, in which case the first terminal device shares sidestream resources within the first COT to the second terminal device, in which case the first terminal device does not receive sidestream feedback information on PSFCH time units, in step 404, and the first terminal device sends sidestream feedback information to the second terminal device on PSFCH time units that are active or available within the first COT.

The second terminal device receives sidestream information from the third terminal device on sidestream resources within the first COT. In this case, step 405 is: the third terminal device receives sidestream feedback information from the second terminal device over active/available PSFCH time units within the first COT.

The first side row indication information indicates an activated time unit in the first PSFCH time unit set, and the remaining time units are unavailable or inactive time units, where the unavailable/inactive time units can only be PSFCH time units corresponding to PSSCH resources of UE1, that is, the deactivated PSFCH time units are PSFCH time units corresponding to resources of UE1 for receiving side row data. Or the deactivated PSFCH time unit is the PSFCH time unit that UE1 determined that other users are not to feed back. That is, when the first terminal apparatus deactivates the PSFCH time unit in a certain slot, it can cancel only the PSFCH time unit corresponding to its own PSSCH or determine that other users have no resources for PSFCH transmission, and when the time-frequency resources shared to other users cannot determine whether there is a PSFCH transmission resource requirement, the COT initiator cannot deactivate the PSFCH transmission resource.

For a deactivated PSFCH time unit in the COT, if the COT is initialized by only one UE, or is initialized by a plurality of UEs (for example, in the case of inter multiplexing), after the PSFCH time unit has been coordinated in advance, the UE can use the deactivated PSFCH time unit for PSSCH transmission, which can not only improve the resource utilization, but also avoid the risk of COT loss.

For example, in the first PSFCH time unit set, the PSFCH time units of the activation state indicated by the first side row indication information constitute a second PSFCH time unit set. It will be appreciated that the set of remaining unavailable/inactive state PSFCH time units in the first set of PSFCH time units other than the second set of PSFCH time units may be referred to as the third set of PSFCH time units. The UE1 may determine that a part of the time units in the third PSFCH time unit set are used as time units for PSSCH transmission, for example, the PSFCH time unit corresponding to the side line transmission resource of the UE1 may be used as the PSSCH transmission, or the UE1 determines that there is no side line feedback information transmission on a certain PSFCH time unit, and may use the resource as the PSSCH resource. For example, UE1 may send fourth side row indication information indicating that a portion of the PSFCH time units in the third PSFCH time unit set are used for PSSCH transmission.

In the unlicensed band, one of the target scenarios of the side link is high-rate or large-bandwidth service, where a large amount of time-frequency resources may be required, for example, occupy a plurality of consecutive symbols, and PSFCH format 0 has the characteristic that 1bit feedback information occupies 1PRB resource, and this feedback manner is not efficient for resource utilization, and for configured PSFCH time units, one PSFCH transmission needs to pair one automatic gain control symbol (automatic gain control, AGC) and one gap symbol, and feedback overhead is large. One possible enhancement is to use codebook-based HARQ feedback, which allows the receiving UE to feed back HARQ-ACKs for multiple Transport Blocks (TBs) to the transmitting UE at a time.

In NR, there are 5 physical uplink control channel (physical uplink control channel, PUCCH) formats, as shown in table 3, PUCCH format 2 occupies 1-2 orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) symbols in the time domain, and is capable of transmitting multi-bit information, and can be used as one of reference formats for HARQ-ACK feedback in a codebook based form for side links in unlicensed bands.

Table 3: physical uplink control channel format

If the side link defines the HARQ-ACK feedback codebook based on the codebook form in the unlicensed band, denoted as PSFCH format1, the PSFCH format1 may be configured or preconfigured by the network. For the PSFCH time unit in which the configurability occurs in the resource pool or the PSFCH time unit indicated by the COT, the PSFCH time unit may be fed back by using the existing PSFCH format 0, or may be fed back by using the newly defined PSFCH format 1.

When supporting multiple PSFCH feedback modes, the first terminal device may also send second side row indication information to the second terminal device, to indicate a specific PSFCH format, that is, to indicate a format that needs to be adopted by the second terminal device to send feedback information, for example, PSFCH format 0 or a new PSFCH format. The second side row indication may be carried by the SCI or MAC CE or RRC signaling, and when carried by the SCI, may be a level 1 SCI or a level 2 SCI. The second side row indicator and the first side row indicator may be located in the same SCI, e.g. in the same first level SCI or in the same second level SCI. Alternatively, the second side row indicator is located in a different SCI than the first side row indicator.

When the new PSFCH format is configured or indicated to be used, feedback is indicated to be performed on the corresponding PSFCH transmission resources according to the newly defined PSFCH format, and in particular, when the new PSFCH format indicates HARQ-ACK feedback based on the codebook, then the receiving UE is indicated to perform HARQ-ACK feedback on the corresponding PSFCH time unit according to the codebook.

Several exemplary descriptions are provided below for the indication of the first side row indication information.

Mode 1.

The first PSFCH time unit set includes M PSFCH time units, and the first side line indication information is used to indicate an activation state of the M PSFCH time units, where M is a positive integer. Wherein time cells in the first set of PSFCH time cells that are in an active/available state constitute a second set of PSFCH time cells.

At this time, the first side-line indication information may be understood as activation signaling or deactivation signaling. A first set of PSFCH time units for activating/deactivating the first configuration information configuration.

For example, the first side row indication information includes 1bit by which the first set of PSFCH time units configured by the first configuration information is activated or 1bit by which the first set of PSFCH time units configured by the first configuration information is deactivated.

The PSFCH periodic configuration information at the system level is obtained by the first configuration information, but this configuration needs to be activated by activation signaling (first side row indication information) for whether the PSFCH time units within the COT are in effect to be used. As illustrated in (a) of fig. 5, the configuration of PSFCH period=2 is periodically configured in the system, that is, the first configuration information configures the PSFCH period in the first COT to be 2, and for the PSFCH time unit in the COT, the first terminal device activates and enables PSFCH feedback to take effect by transmitting the first side line indication information. If UE1 successfully preempts COT #1, this (pre) configuration of PSFCH period 2 may be activated by signaling at the beginning of the COT, while when COT #2 is initially, the absence of any activation signaling indicates that the configured PSFCH time unit within the COT is not in effect and may be used to transmit other data or information, such as PSSCH. For signaling whether the existing PSFCH configuration resource is effective, only 1bit indication information is needed.

Or, for the PSFCH periodic configuration information indicated by the first configuration information, defaulting to the configuration to be effective for all the COTs in the resource pool. If the PSFCH time unit needs to be deactivated, deactivation signaling needs to be sent to cancel the configuration. As shown in fig. 5 (b), the PSFCH period configured in the resource pool is 2, in the COT #1, since the COT initial slot does not transmit the deactivation signaling, the configuration that the PSFCH feedback period in the COT is 2 is still valid, and in the COT #2, since the COT initial slot transmits the deactivation signaling, the PSFCH time units in the COT are disabled, and these disabled PSFCH time units can be used to transmit other data or information, such as PSSCH.

In particular, in one way, the bit activation in the first side-line indication information is only validated for the time slot in which the subsequent first PSFCH time unit is located, as shown in fig. 6 (a), the configuration that PSFCH period=2 is periodically configured in the system, and for the (pre) configured PSFCH time unit, the corresponding PSFCH time unit needs to be validated by the activation instruction, and since the activation instruction is received before the time slots in which psfch#1 and psfch#3 are located, the time slot difference between the PSFCH time unit and the activation instruction should be considered for this activation mode, so as to ensure that the user who wants to perform feedback here can successfully decode the activation instruction.

In particular, there is a way that the first side-line indication information indicates that the bit activation is valid only for the time slot in which the following first PSFCH time unit is located, as shown in fig. 6 (b), the configuration that PSFCH period=2 is periodically configured in the system, and for the (pre) configured PSFCH time unit, it is necessary to pass the deactivation command, and since the deactivation command is received before the time slots in which psfch#1 and psfch#3 are located, both the PSFCH time units in these two positions are deactivated, and for this activation way, the time slot difference between the PSFCH time unit and the activation command should be considered, so as to ensure that the user who originally wants to feed back here can successfully decode this activation command.

At this time, the transmission timing of the first side line instruction information is not limited to the first few slots in the first COT. For example, in fig. 6 (a), the first side line indication information transmitted in the fifth slot indicates that the sixth slot is an active PSFCH time unit, or that some symbols of the sixth slot are active PSFCH time units.

Mode 2.

The first set of PSFCH time units includes M PSFCH time units, the first side row indication information includes L bits, and the L satisfies the following relationship:

L＝(M _COT *2 ^u )/N _PSFCH

wherein u is related to subcarrier spacing configuration, N _PSFCH Representing PSFCH time unit period, M _COT Represents the maximum occupation time, N, of the first COT _PSFCH Configured for the first configuration information.

For PSFCH periodic configuration information obtained by RRC signaling sl-PSFCH-Period in the system, the configuration is unified for all COTs in the resource pool by default, i.e., a per resource pool level system level configuration, and a (de) activation signaling on (cancel) part of the PSFCH time unit needs to be sent. The PSFCH period in the resource pool is set as followsThe subcarrier configuration in the resource pool is denoted by u, for example u=0 indicates scs=15 KHz, and refer to table 2 specifically. The maximum COT length that the terminal can occupy in the unlicensed band is denoted as M _COT In the NRU lower case, when the channel access priority level cap=1, the maximum COT duration T is at this time _mcot，p COT duration of 2ms, i.e. the terminal with CAPC 1, cannot exceed 2ms, in particularSee table 1.

TABLE 2

The Bitmap indicates whether the PSFCH time unit of the system level in the COT is in effect or not, i.e. by the specific bit value in the Bitmap, for example, "1" indicates that the PSFCH time unit of the timeslot configuration is in effect, and "0" indicates that the PSFCH time unit of the timeslot configuration is out of effect, and then the Bitmap length is equal to L. The maximum bit number required for the bitmap indication information is given belowM _COT . When the indication information is indicated by SCI, in order to ensure uniformity of SCI length in the resource pool, it is assumed that the indication information length should also be L. I.e. < ->

The meaning of the formula is: for SCS configuration u, M _COT In units of ms, each ms containing M _COT *2 ^u Time slots, since PSFCH time unit period configured in system isTherefore, in the Mcot slot, the number of slots having PSFCH time units is L.

Assume that a terminal occupies COT for a period of time T _COT ,T _COT <＝M _COT And the number of the PSFCH time units configured in the COT is M, the first M bits in the L bits are used for indicating the activation state of the PSFCH time units in the COT, and the remaining L-M bits can not specifically indicate the activation state.

An example is given below, as shown in (c) of fig. 6: one resource pool PSFCH period n=2, scs=30khz, maximum M supported in the resource pool _COT With a duration of 10ms, then l= (10 x 2)/2=10bits. If a terminal occupies a PSFCH time unit m=4 in the COT in the resource pool, the first 4 bits are taken to indicate the resource poolIn the PSFCH time unit activation state, UE1 preempts 4.5ms through LBT, the number of PSFCH time units in the COT is 4, i.e. m=4, at this time, only the first 4 of the 10bits are needed to indicate the activation state corresponding to the PSFCH time unit in the COT, 0 indicates that the PSFCH time unit is deactivated, and 1 indicates that the PSFCH time unit is in the activation state. The bitmap indication may be sent in the first time slot of the COT.

Mode 3.

The first set of PSFCH time units includes M PSFCH time units, the first side row indication information includes Q bits, each P bits being used to indicate an activation state of a PSFCH time unit of consecutive k slots, and the P and Q satisfy the following relationship:

P＝ceil(log2(k))

wherein u indicates a subcarrier spacing parameter, N _PSFCH Representing PSFCH time unit period, M _COT Represents the maximum occupation time, N, of the first COT _PSFCH Configured for the first configuration information.

G of the Q bits are used to indicate the activation state of M PSFCH time units, and g= Where M' represents the actual duration of the first COT. />

K PSFCH time units are grouped into a group by indicating the activation state of the PSFCH time units in a group unit in the form of a time slot group in which the PSFCH time units are located.

Alternatively, p may take 1, i.e., 1bit, to indicate the PSFCH time unit activation status of K in the group. Since the k PSFCH time units are in a group of time slots, there is a total ofThe number of bits required is therefore q=g. When a certain resource pool PSFCH period n=2 and scs=30khz, u=1, and regulations define a resource poolMaximum M of internal support _COT As shown in fig. 7, UE1 preemptively occupies 4.5ms through LBT, the number of PSFCH time units in the COT is 4, that is, m=4, and k=2, the number of packets is 2, and only the first 2 of the 5bits are needed to indicate the activation state corresponding to the PSFCH time units in the COT, 0 indicates that the PSFCH time units in the packet 1 are deactivated, and 1 indicates that the PSFCH time units in the packet 2 are activated. The bitmap indication may be sent in the first time slot of the COT.

Optionally, P bits indicate consecutive K PSFCH time unit activation states within the group: each group requires p=ceil (log 2 (k)) bits as much as it doesGrouping, then the length of the indication information is +. > Where ceil () represents a round-up. Or in one possible way the number of bits required P1 for the last packet<=p, i.e. the last remaining PSFCH time units number is +.> Then the last set of required bits p1=ceil (log 2 (M1)). G=p (G-1) +p1 at this time. The following examples are given: when a certain resource pool PSFCH period n=2 and scs=30khz, u=1, the rule specifies the maximum M supported in the resource pool _COT The duration is 10ms, k=2 g=5bits, ue1 preempts 4.5ms through LBT, and the number of PSFCH time units in cot is 4, i.e. m=4, k=2. At this time, only the first 2 bits of the 5bits are needed to indicate the corresponding activation state of the PSFCH time unit in the COT, if the indication indicates an activation indication, referring to FIG. 8 (a), since the first two bits are 1, the PSFCH time unit indicating the second position of the packet is in the activation stateI.e., psfch#2 and psfch#4 are available PSFCH time units; if the indication indicates a deactivation indication, then referring to fig. 8 (b), since the first two bits are 0, the PSFCH time units indicating the second position of the packet are deactivated, i.e., psfch#2 and psfch#4 are unavailable, while for other PSFCH time units within the group are available, i.e., psfch#1 and psfch#3 may be used for PSFCH feedback transmission.

The application also provides a method 800 for sending sidestream feedback information in a SL-U scene. By the method, the situation that the PSFCH configured in the COT is possibly lost due to no feedback is avoided, and the reliability of sidestream communication is improved.

801. The first terminal device determines a first side feedback resource corresponding to the first side resource.

The first sidelink resource is located within a first COT of the first channel. The first COT is determined for the first terminal device or the first COT is determined for the second terminal device, and the first side resources are shared by the second terminal device to the first terminal device.

The first sidestream resources are located within a first COT of the first channel, and the first sidestream resources are used to transmit sidestream information. The first sidelink resource may also be referred to as a PSSCH resource. The first side line resource and the first side line feedback resource have a corresponding relation, and the corresponding relation can be predefined or configured. The first sidestream feedback resource is used for feeding back the receiving condition of sidestream information transmitted on the first sidestream resource. For example, if the sidestream information is received correctly, ACK is fed back, and if the sidestream information is received incorrectly, NACK is fed back.

The first terminal device is the initiator of the first COT, i.e., the first COT is determined by the LBT for the first terminal device. In this case, the first sidelink resource is located within the COT preempted by the first terminal apparatus. The initiator of the first COT may be another terminal device, for example, the second terminal device seizes the first channel and obtains the first COT, the second terminal device shares the first sidestream resource in the first COT to the first terminal device, and the first terminal device transmits sidestream information on the first sidestream resource, or receives sidestream information. I.e. the first terminal device is either a COT initial UE or a TX UE or an RX UE of sidelink resources.

Before step 801, the first terminal apparatus may receive first configuration information, where the first configuration information is used to configure a PSFCH time unit, including a period of the PSFCH and a positional relationship of the PSFCH time unit in a resource pool, indicated by a bitmap indicated by sl-PSFCH-RB-Set "and/or" sl-RB-SetPSFCH, when the period configures parametersWhen not equal to 0, the PSFCH time units in the resource pool occur periodically. The first configuration information may be carried in RRC high layer signaling.

And the first terminal device determines a first side feedback resource corresponding to the first side resource according to the first configuration information.

Step 802. In case the first condition is met, the first terminal device sends the second information on the first side feedback resource.

The second information sent by the first terminal device is used for occupying the first side feedback resource. The second information may be HARQ-ACK feedback information, or the second information may be padding bits, or the second information may be sidestream data. It can be appreciated that the first terminal device can avoid the first COT loss by sending the second information on the first side feedback resource.

The first condition is that the first side-line resource is used for the first terminal device to send the first side-line information through a blind retransmission mode.

When the sidestream information transmitted on the first sidestream resource is transmitted in a blind retransmission mode, no feedback information is transmitted on the sidestream feedback resource corresponding to the sidestream resource, namely the first sidestream resource.

The first terminal device transmits the first side information, or the first terminal device receives the first side information. The first side line information includes HARQ feedback enabled/disabled indicator in SCI format 2-a/B/C, and the indicator is set to be in a disabled state, that is, represents that the first side line information is sent by a blind retransmission mode. The SCI is broadcast information, and UE within a certain geographic range can receive the SCI. As shown in fig. 9, the PSFCH period configured at the system level in the resource pool is 2, that is, the PSFCH feedback opportunity occurs once every 2 slots, and the processing delay is configured to be 2 slots, so that the feedback information of the PSSCH of slot0 and slot1 is sent in slot 3. When slot0 and slot1 are blind retransmission and PSFCH period in the resource pool is 2, no terminal feedback exists in PSFCH time units of slot1 and slot3, and if gap >25us, the risk of COT loss is brought.

And 2. The first condition is that the time interval between the first side line resource and the first side line feedback resource is smaller than a first threshold value.

In this case, the first terminal apparatus occupies the first side feedback resource by transmitting the second information. PSSCH-PSFCH processing delay is insufficient. The first threshold is either standard predefined or configured. Optionally, the first terminal device is a first COT.

Considering the limitation of decoding capability of the receiving end user, the receiving end user cannot immediately feed back after receiving the PSSCH, so the standard defines a time interval K for PSSCH feedback, that is, the PSSCH transmits the PSFCH on the first available time slot containing the PSFCH time unit, the time slot is at least K time slots apart from the time slot in which the PSSCH is located, and the value of K is configured by the resource pool. As shown in fig. 3 (e), when k=2, the PSSCHs carried on slots 0 and 1 can be fed back on the PSFCH time unit on slot 3. As shown in fig. 9, when the minimum processing delay set in the resource pool is 2 slots, PSSCH resources corresponding to Slot0 and Slot1 can only be fed back in Slot3, so that there is no terminal feedback in the PSFCH time unit in Slot1, and at this time, gap >25us, which brings about a risk of COT loss.

Case 3. The first condition is that the first side resource is used for the first terminal device to transmit the broadcast service.

The first side resource is used for the first terminal device to transmit or receive broadcast services. I.e. the first terminal device is the sender or receiver of the broadcast service.

For broadcast traffic, HARQ feedback is not required, and there may be no user feedback on the corresponding PSFCH time unit. Therefore, when the sender/receiver of the sidestream information determines that the sidestream information is a broadcast service, the sender/receiver can determine to occupy the corresponding PSFCH time unit, and the risk that COT is possibly lost due to no feedback on the resource is avoided.

And 4, the first condition is that the first side resource is used for transmitting the multicast type 1 service, and when the user does not successfully decode SCI or the user is ACK after decoding, no terminal needs to feed back at a PSFCH time unit at this time, and the COT loss risk exists.

The first terminal device is a transmitting end or a receiving end of the multicast type 1 service.

And 5, the first condition is that the first side line resource and the first side line feedback resource are positioned in a first channel, and the energy detected by the first terminal device in a first time period before the time domain position of the first side line resource is lower than a second threshold value or the side line control information SCI is not detected. The length of the first time length isAssuming that the first PSFCH time unit occurrence in COT is numbered slot N in the resource pool, if COT initiator detects +.>The slot energy is below the threshold, or no SCI is detected, where K is the PSSCH feedback time interval defined by the standard. If the detected energy is lower than the second threshold, the fact that no terminal occupies the channel before, namely no user needs to feed back at the PSFCH time unit pool according to the mapping relation; if the energy is above the threshold but no SCI is detected, this indicates that it may be occupied by a different system terminal, and feedback is needed at the PSFCH time cell pool where the mapping relationship is located.

In step 802, the first terminal device sends the second information on the first feedback resource, where the first feedback resource may include one feedback resource or include multiple feedback resources.

I.e. the first side-line resource corresponds to one side-line feedback resource or to a plurality of side-line feedback resources.

If there are only 1 candidate resources corresponding to the first side resource, the first terminal device may send the second information on the first side resource. For example, LBT may be made at the PSFCH where the candidate resource is located, and after the LBT passes, the second information may be sent.

If the number of the first side feedback resources corresponding to the first side resources is more than one. The first sidestream feedback resource includes a second sidestream feedback resource and a third sidestream feedback resource, the second sidestream feedback resource and the first sidestream resource are located in the same channel, the third sidestream feedback resource and the first sidestream resource are located in different channels, and then the first terminal device sends second information on the first sidestream feedback resource, including: the first terminal device sends second information on the second sidestream feedback resource. The first terminal device preferably selects PSFCH resources in the first COT to occupy, that is, preferentially occupies side feedback resources located in the same RB set as side feedback resources or side transmission resources.

When 1 PSSCH resource corresponds to Q (Q > =1) RBs set on a certain slot, there are candidate resources, for example, as shown in fig. 10. If the terminal is occupied to pass LBT on Q '(Q' <=q) slots on a certain slot, the terminal transmits PSFCH resources in one or more RB sets within the preempted COT and/or shared COT. The PSFCH resource may be a common PSFCH and/or a 1PRB resource corresponding to PSFCH format 0, or may be an interface/RB resource and/or a 1PRB resource corresponding to PSFCH format 0, where the common PSFCH resource is not related to PSSCH-PSFCH mapping of a UE. The PSFCH is fed back preferentially on the cog occupied by the terminal or on the RB set where the cog where the PSSCH is located, or alternatively, one transmission may be randomly selected. As shown in fig. 10, if the COT resource (pink) preempted by 1 on Channel #1 and the COT (Channel # 2) where UE1 transmits the PSSCH are not on the same Channel, if UE1 passes LBT on both channels, feedback may be given to both channels at the corresponding positions (PSFCH resources numbered 0 and 1) or one of them.

The first sidelink feedback resource is a Common sidelink feedback resource, and the first terminal device may send the second information on a Common PSFCH resource. In this case, the common side feedback resource has no binding correspondence with the first side resource, and the common side feedback resource may be used for the plurality of UEs to send feedback information. The common sidestream feedback resource is used to meet the communication requirements.

Optionally, the second terminal device determines a first side feedback resource corresponding to the first side resource, where the first side feedback information is used for the second terminal device to receive the first side information; and under the condition that the first condition is met, the first terminal device sends third information on the first side feedback resource, wherein the third information is used for occupying the first side feedback resource. At this time, the second terminal device receives the sidestream information on the first sidestream resource in the first COT, and in order to prevent the COT from being lost, the second terminal device sends a signal on the first sidestream feedback resource to occupy the resource, so as to avoid the COT loss caused by no signal in a certain period of time.

As shown in fig. 11, in the unlicensed band, two terminals preempt the respective COTs in succession. COT#1 can preempt other SL users or users of different systems, meanwhile, a periodic PSFCH resource is configured in a resource pool, the period is 2, the processing time delay is 2 time slots, namely, the PSFCH resource is decoupled from the COT. When the incoherent UE outside the cot#2 (i.e., the UE in the cot#1) is allowed to feed back in the present COT, since the user in the cot#2 does not determine the feedback behavior of the cot#1 user, that is, does not determine whether the pssch#0 corresponds to the PSFCH resource, whether the user feeds back here, in order not to interfere with the normal feedback of other users, and at the same time, it is ensured that the present COT is not lost, so that the occupied terminal can send data on the common PSFCH resource. For the region with the requirement of the OCB regulation, one possible way is that the UE still uses 1PRB resource to perform HARQ-ACK feedback according to the manner defined by R16, and meanwhile, needs to transmit PSFCH resources on common interface, where there is no corresponding PSSCH-PSFCH mapping relationship, and the common interface resource may be an integral whole on the whole resource pool or an RB set on a certain RB set of the resource pool. For the scenario supporting multi-user multiplexing, multiple users access simultaneously on the same time slot, but use different interface resources. As shown in fig. 12, the frequency domain resource adopts an interference structure, and for the case that the subcarrier interval is 15KHz (30 KHz), a group of independent interference resources can be formed by every 10 (5) PRBs in the resource pool, or a group of independent interference resources can be formed by every 10 (5) PRBs per RB set in the resource pool, UEs 1, 2 and 3 occupy 2 and 1/3 interfaces respectively to transmit PSSCH data, and at the corresponding PSFCH resource feedback, UEs 1/2/3 need to transmit signals in common interference besides the PRB resources occupied by the mapping relationship of the 1PRB resource feedback, i.e. R16.

However, for a scenario where the PSSCH-PSFCH processing delay is insufficient, if common PSFCH resources are not introduced, the COT initiator may cancel the PSFCH transmission resources at the corresponding location for transmitting other data or information, such as PSSCH. Or the occupied terminal sends the occupied signal at the corresponding PSFCH resource according to the corresponding mapping relation. As shown in fig. 13, for the first PSFCH resource in the COT, no user feeds back on the resource at this time due to the processing delay relationship, so as to ensure that the PSFCH resource is not lost, the occupying terminal may send data or signals on the frequency domain position where the PSFCH mapping corresponding to the PSSCH is located. As indicated by the arrow in fig. 13, the green box is indicated, according to the mapping relation of PSFCH format 0, the PSSCH resource on each subshannel has a corresponding PSFCH position, and only needs to be sent according to the predetermined mapping relation, that is, the first two timeslots of the original COT should be fed back at the second PSFCH, but because of the processing delay relation, no information feedback is caused, and then the mapping feedback can be moved forward according to the position fed back at the subsequent resource, so that the data/signal can be sent.

In addition to the above data transmission method, the present application also provides a related introduction of a sidelink resource pool (hereinafter referred to as a resource pool for short) in an unlicensed frequency band. This will be described below.

Optionally, the resource pool comprises at least one channel. Illustratively, resource pool #1 may include 4 channels.

The bandwidth of each channel in the resource pool may be, for example, 20 megahertz (MHz). Of course, the bandwidth of the channel may also be other values, which are not particularly limited in this application.

Alternatively, a certain channel cannot be located in different resource pools at the same time. For example, channel #1 cannot be located in both resource pool #1 and resource pool # 2.

Alternatively, the channel may be divided into a plurality of sub-channels. The size of the sub-channels may be, for example: 10. 12, 15, 20, 25, 50, 75 or 100 physical resource blocks (physical resource block, PRB). Wherein PRBs included in a subchannel may be contiguous or may be interleaved (interleaved).

For example, when PRBs included in a subchannel are interleaved PRBs, a subchannel M, M e {0,1, … M-1} may be defined, and the index of PRBs included in the subchannel M may be { M, m+m,2m+m, 3m+m. Where M is a constant, and its value may be determined by the subcarrier spacing.

Alternatively, for a certain channel, a guard (guard) PRB may be included in the channel, where the guard PRB is not used for data/signaling transmission. PRBs other than the guard PRBs may constitute a common (common) PRB set. The subchannels may be partitioned based on common PRB sets. In this application, unless specifically stated otherwise, RBs refer to PRBs, and thus, descriptions of RBs and PRBs may be interchanged.

For a resource pool comprising a plurality of channels, the sub-channels comprised by different channels may be numbered consecutively. For example, channel #1 includes sub-channels numbered 1 through 10, channel #2 may have sub-channel numbers 11 through 20, channel #3 may have sub-channel numbers 21 through 30, and so on.

In addition, if the terminal device uses multiple sub-channels in the channel to transmit simultaneously, the multiple sub-channels may be continuous sub-channels or discontinuous sub-channels, which is not specifically limited in this application.

Alternatively, the PRBs in a subchannel may be contiguous when the resource pool is (pre) configured to disable the inter PRBs. When the resource pool is (pre) configured to allow the use of interleaved PRBs, the PRBs in the sub-channels may be interleaved.

Alternatively, the terminal device may perform LBT on at least one channel of the resource pool before transmitting data. After preempting the channel and determining the COT, the transmission may be performed with the sub-channels as granularity. For example, after the terminal device preempts a channel, it may transmit on at least one subchannel of that channel. Alternatively, when the resource pool is (pre) configured to disable the inter PRB, if the terminal device uses multiple subchannels in the channel for transmission, the PSCCH may be located on a subchannel with the smallest index of the multiple subchannels, or may be located on a subchannel with the lowest frequency of the multiple subchannels. Furthermore, the PSCCH is located within the same sub-channel in each transmission within the COT.

The resource pool is (pre) configured to allow use of the interleaved PRBs, if the terminal device uses multiple sub-channels within the channel for transmission, the PSCCH may be located on the lowest indexed sub-channel of the multiple sub-channels or may be located on the lowest frequency sub-channel of the multiple sub-channels. In addition, the time domain start position of the PSCCH is the same as or aligned with the time domain start position of the resource pool. In each transmission within the COT, the PSCCH is located within the same subchannel.

Based on the design of the PSCCH and the PSSCH, the PSCCH can be configured in one sub-channel, and the terminal equipment only needs to perform blind decoding on the PSCCH in the specific sub-channel, so that the power consumption of the terminal equipment can be reduced.

Optionally, the resource pool is not used for transmitting periodic side-uplink synchronization signals and physical broadcast channel (physical broadcast channel, PBCH) blocks (sidelink synchronization signal and PBCH block, S-SSB), i.e. periodic S-SSB is arranged outside the resource pool. If the S-SSB is transmitted on the resources in the resource pool, there may be a case that the terminal device needs to simultaneously receive the PSCCH/PSSCH when transmitting the S-SSB, and at this time, the S-SSB may fail to transmit because the terminal device is a half duplex device. In addition, the slot structure of the S-SSB is different from that of the PSCCH/PSSCH, which increases the implementation complexity of the terminal device if the S-SSB is transmitted on resources in the resource pool, and the resources in the resource pool are dynamically preempted (or allocated) and are not suitable for periodic S-SSB transmission. That is, the periodic S-SSB is configured outside the resource pool, so that the transmission of the S-SSB is ensured, and the implementation complexity of the terminal equipment is reduced.

Alternatively, the time domain resources (or time domain locations) of the resource pool may be indicated by a configuration bit map (bitmap). For example, the bit map may include N bits, each of the N bits may correspond to at least one time unit, and all time units corresponding to the N bits are consecutive. When the value of a certain bit is equal to 1 (or 0), the time unit corresponding to the bit can be used for SL transmission, or the time domain resource of the resource pool comprises the time unit corresponding to the bit; when the value of a certain bit is equal to 0 (or 1), the time unit corresponding to the bit is indicated not to be used for SL transmission, or the time domain resource of the resource pool does not include the time unit corresponding to the bit.

Illustratively, the time units may be slots, orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) symbols, subframes, frames, etc., which are not specifically limited in this application.

For SL-U, each bit in the bit map may be configured to be 1 (or 0), which indicates that the time unit corresponding to each bit may be used for SL transmission. If a bit has a value of 0 (or 1) in the bit map, which indicates that the time unit corresponding to the bit is not used for SL transmission, the time domain resources in the resource pool are discontinuous, which may cause the terminal device to fail to maintain the COT on the channel in the unlicensed band. Therefore, each bit in the bit map is set to 1 (or 0), so that the terminal equipment can maintain COT on a channel in an unlicensed frequency band, and data transmission is realized.

Optionally, there may be reserved (reserved) slots in the SL resource pool of the licensed band, where the reserved slots are slots determined to ensure that the remaining slot resources are integer multiples of the bitmap length after the mode2 resource awareness mechanism is used to exclude the unavailable slot resources. In the SL resource pool of the unlicensed band, if each bit in the bit map is configured to be 1 (or 0), the reservation time unit is not included (or not present) in the resource pool.

Alternatively, the transmission in the above method may be performed with sub-channels as granularity.

Fig. 14 is a schematic structural diagram of a communication device according to an embodiment of the present application. The communication device 1400 may be a terminal device in fig. 2, or a first terminal device and a second terminal device in fig. 4, for implementing the method for a terminal device in the above method embodiment. Specific functions can be seen from the description of the method embodiments described above.

The communication device 1400 includes one or more processors 1401. The processor 1401 may also be referred to as a processing unit and may implement certain control functions. The processor 1401 may be a general purpose processor or a special purpose processor, etc. For example, it includes: a baseband processor, a central processing unit, an application processor, a modem processor, a graphics processor, an image signal processor, a digital signal processor, a video codec processor, a controller, a memory, and/or a neural network processor, etc. The baseband processor may be used to process communication protocols as well as communication data. The central processor may be used to control the communication device 1400, execute software programs, and/or process data. The different processors may be separate devices or may be integrated in one or more processors, e.g., integrated on one or more application specific integrated circuits.

Optionally, the communication device 1400 includes one or more memories 1402 for storing instructions 1404 that can be executed on the processor to cause the communication device 1400 to perform the methods described in the method embodiments above. Optionally, the memory 1402 may also store data therein. The processor and the memory may be provided separately or may be integrated.

Alternatively, the communication device 1400 may include instructions 1403 (sometimes also referred to as code or program), which instructions 1403 may be executed on the processor, causing the communication device 1400 to perform the methods described in the above embodiments. The processor 1401 may store data therein.

Optionally, the communication device 1400 may also include a transceiver 1405 and an antenna 1406. The transceiver 1405 may be referred to as a transceiver unit, a transceiver circuit, a transceiver, an input-output interface, etc. for implementing the transceiver function of the communication device 1400 through the antenna 1406.

Optionally, the communication device 1400 may also include one or more of the following: wireless communication modules, audio modules, external memory interfaces, internal memory, universal serial bus (universal serial bus, USB) interfaces, power management modules, antennas, speakers, microphones, input/output modules, sensor modules, motors, cameras, or displays, among others. It is to be appreciated that in some embodiments, the UE 1400 may include more or fewer components, or some components may be integrated, or some components may be split. These components may be hardware, software, or a combination of software and hardware implementations.

The processor 1401 and transceiver 1405 described in this application may be implemented on an integrated circuit (integrated circuit, IC), analog IC, radio frequency integrated circuit (radio frequency identification, RFID), mixed signal IC, application specific integrated circuit (application specific integrated circuit, ASIC), printed circuit board (printed circuit board, PCB), or electronic device, among others. The communication apparatus described herein may be implemented as a stand-alone device (e.g., a stand-alone integrated circuit, a mobile phone, etc.), or may be part of a larger device (e.g., a module that may be embedded in another device), and reference may be made specifically to the foregoing description of the terminal device and the network device, which is not repeated herein.

The embodiment of the present application provides a terminal device (referred to as UE for convenience of description) that may be used in the foregoing embodiments. The terminal device comprises corresponding means, units and/or circuits to implement the UE functionality described in the embodiments shown in fig. 1, fig. 4 and/or fig. 8. For example, the terminal device includes a transceiver module for supporting the terminal device to implement the transceiver function, and a processing module for supporting the terminal device to process the signal.

Fig. 15 is a schematic structural diagram of a terminal device according to an embodiment of the present application.

The terminal device 1500 may be adapted for use in the system shown in fig. 1 and 2. For ease of illustration, fig. 15 shows only the main components of the terminal device 1500. As shown in fig. 15, the terminal apparatus 1500 includes a processor, a memory, a control circuit, an antenna, and an input-output device. The processor is mainly used for processing communication protocols and communication data, controlling the whole terminal device 1500, executing software programs, and processing data of the software programs. The memory is mainly used for storing software programs and data. The control circuit is mainly used for converting baseband signals and radio frequency signals and processing the radio frequency signals. The antenna is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves. Input and output devices such as touch screens, display screens, microphones, keyboards, etc. are mainly used for receiving data input by a user and outputting data to the user.

Taking the terminal device 1500 as a mobile phone for example, after the terminal device 1500 is turned on, the processor may read the software program in the storage unit, interpret and execute the instructions of the software program, and process the data of the software program. When data is required to be transmitted wirelessly, the processor carries out baseband processing on the data to be transmitted and then outputs a baseband signal to the control circuit, and the control circuit carries out radio frequency processing on the baseband signal and then transmits the radio frequency signal outwards in the form of electromagnetic waves through the antenna. When data is transmitted to the terminal device 1500, the control circuit receives a radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, which converts the baseband signal into data and processes the data.

Those skilled in the art will appreciate that for ease of illustration, only one memory and processor is shown in fig. 15. In some embodiments, terminal device 1500 can include multiple processors and memory. The memory may also be referred to as a storage medium or storage device, etc., and embodiments of the present application are not limited in this regard.

As an alternative implementation, the processor may include a baseband processor, which is mainly used to process the communication protocol and the communication data, and a central processor, which is mainly used to control the entire terminal device 1500, execute a software program, and process the data of the software program. The processor in fig. 15 integrates the functions of a baseband processor and a central processing unit, and those skilled in the art will appreciate that the baseband processor and the central processing unit may be separate processors, interconnected by bus technology, etc. Terminal device 1500 may include multiple baseband processors to accommodate different network formats, terminal device 1500 may include multiple central processors to enhance its processing capabilities, and the various components of terminal device 1500 may be connected via various buses. The baseband processor may also be expressed as a baseband processing circuit or a baseband processing chip. The central processing unit may also be expressed as a central processing circuit or a central processing chip. The function of processing the communication protocol and the communication data may be built in the processor, or may be stored in the storage unit in the form of a software program, which is executed by the processor to realize the baseband processing function.

In one example, the antenna and the control circuit having a transmitting and receiving function may be regarded as the transmitting and receiving unit 1510 of the terminal device 1500, and the processor having a processing function may be regarded as the processing unit 1520 of the terminal device 1500. As shown in fig. 15, the terminal apparatus 1500 includes a transceiving unit 1510 and a processing unit 1520. The transceiver unit may also be referred to as a transceiver, transceiver device, etc. Alternatively, a device for implementing a receiving function in the transceiver 1510 may be regarded as a receiving unit, and a device for implementing a transmitting function in the transceiver 1510 may be regarded as a transmitting unit, i.e., the transceiver 1510 includes a receiving unit and a transmitting unit. For example, the receiving unit may also be referred to as a receiver, a receiving circuit, etc., and the transmitting unit may be referred to as a transmitter, a transmitting circuit, etc.

Those of ordinary skill in the art will appreciate that the elements and steps of the examples described in connection with the embodiments disclosed herein can be implemented as electronic hardware, or as a combination of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, and for example, the division of the units is merely a logical functional division, and units illustrated as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or contributing part or part of the technical solution in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. The foregoing computer-readable storage media can be any available media that can be accessed by a computer. Taking this as an example but not limited to: the computer readable medium may include random access memory (random access memory, RAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (electrically erasable programmable read only memory, EEPROM), compact disc read-only memory (compact disc read-only memory, CD-ROM), universal serial bus flash disk (universal serial bus flash disk), a removable hard disk, or other optical disk storage, magnetic disk storage media, or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. In addition, by way of example and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), or direct memory bus RAM (DR RAM).

The foregoing is merely specific embodiments of the present application, but the scope of the embodiments of the present application is not limited thereto, and any person skilled in the art may easily think about changes or substitutions within the technical scope of the embodiments of the present application, and the changes or substitutions are intended to be covered by the scope of the embodiments of the present application. Therefore, the protection scope of the embodiments of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of communication, comprising:

the first terminal device determines a first channel occupation time COT through channel access;

the first terminal device acquires first configuration information, wherein the first configuration information is used for indicating PSFCH period configuration of a sidestream resource pool;

the first terminal device determines a first PSFCH time unit set in a first COT according to the first configuration information;

the first terminal device sends first side line indication information, and the first side line indication information indicates the second terminal device to send side line feedback information in a second PSFCH time unit set; the second set of PSFCH time units belongs to the first set of PSFCH time units.

2. The method of claim 1, wherein the step of determining the position of the substrate comprises,

The second set of PSFCH time units includes time units that are active in the first set of PSFCH time units.

3. A method according to claim 1 or 2, characterized in that,

the first PSFCH time unit set includes M PSFCH time units, and the first side line indication information is used to indicate an activation state of the M PSFCH time units, where M is a positive integer.

4. A method according to claim 1 or 2, characterized in that,

the first set of PSFCH time units includes M PSFCH time units, the first side row indication information includes L bits, and L satisfies the following relationship:

L＝(M _COT *2 ^u )/N _PSFCH

5. A method according to claim 1 or 2, characterized in that,

P＝ceil(log2(k))

6. A method of communication, comprising:

the second terminal device acquires first configuration information;

the second terminal device determines a first PSFCH time unit set in a first COT according to the first configuration information;

the second terminal device receives first side line indication information from a first terminal device, wherein the first side line indication information indicates that side line feedback information is sent in a second PSFCH time unit set, and the second PSFCH time unit set belongs to the first PSFCH time unit set.

7. The method of claim 6, wherein the step of providing the first layer comprises,

8. The method according to claim 6 or 7, wherein,

9. The method according to claim 6 or 7, wherein,

L＝(M _COT *2 ^u )/N _PSFCH

10. The method according to claim 6 or 7, wherein,

P＝ceil(log2(k))

11. A method of communication, comprising:

the first terminal device determines a first side feedback resource corresponding to the first side resource;

and under the condition that the first condition is met, the first terminal device sends second information on the first side feedback resource, wherein the second information is used for occupying the first side feedback resource.

12. The method of claim 11, wherein the step of determining the position of the probe is performed,

the first condition includes one of:

the first side-line resource is used for the first terminal device to send first side-line information in a blind retransmission mode;

the time interval between the first side line resource and the first side line feedback resource is smaller than a first threshold value;

the first side resource is used for the first terminal device to transmit broadcast service;

the first side-line resource and the first side-line feedback resource are located in a first channel, and the energy detected by the first terminal device in a first time period before the time domain position of the first side-line resource is lower than a second threshold; or alternatively

The first terminal device does not detect the sidestream control information SCI within a first duration before the time domain position of the first sidestream resource.

13. The method according to claim 11 or 12, wherein,

the first sidelink resource is located in a first COT of a first channel;

the first COT is determined for the first terminal device, or

The first COT is shared by a second terminal device with the first terminal device.

14. The method according to any one of claims 11-13, wherein,

The first sidestream feedback resources include common sidestream feedback resources.

15. The method according to any one of claims 11-14, wherein,

the first sidestream feedback resources include a second sidestream feedback resource and a third sidestream feedback resource, the second sidestream feedback resource and the first sidestream resource being located in the same channel, the third sidestream feedback resource and the first sidestream resource being located in different channels,

the first terminal device sends second information on the first side feedback resource, including:

and the first terminal device sends second information on the second sidestream feedback resource.

16. A method of communication, comprising:

the second terminal device determines a first side feedback resource corresponding to a first side resource, wherein the first side feedback information is used for the second terminal device to receive the first side information;

and under the condition that the first condition is met, the first terminal device sends third information on the first side feedback resource, wherein the third information is used for occupying the first side feedback resource.

17. The method of claim 16, wherein the step of determining the position of the probe comprises,

the first condition includes one of:

The first side information is sent by a blind retransmission mode;

the first side information belongs to a broadcast service.

18. The method according to claim 16 or 17, wherein,

the first side-stream resource is located in a first COT of a first channel, and the first side-stream resource is shared by other terminal devices to the second terminal device.

19. The method according to any one of claims 16-18, wherein,

20. A communication device, comprising:

a processor for executing a computer program stored in a memory to cause the apparatus to perform the method of any one of claims 1 to 5 or to cause the apparatus to perform the method of any one of claims 6 to 9 or to cause the apparatus to perform the method of any one of claims 10 to 13 or to cause the apparatus to perform the method of any one of claims 14 to 15.

21. The apparatus of claim 20, further comprising the memory and/or a communication interface coupled with the processor,

The communication interface is used for inputting and/or outputting information.

22. A computer-readable storage medium, on which a computer program is stored which, when run on a computer, causes the computer to perform the method of any one of claims 1 to 5, or to cause the computer to perform the method of any one of claims 6 to 9, or to cause the computer to perform the method of any one of claims 10 to 13, or to cause the computer to perform the method of any one of claims 14 to 15.

23. A computer program product comprising instructions for performing the method of any one of claims 1 to 5 or for performing the method of any one of claims 6 to 9 or for performing the method of any one of claims 10 to 13 or for performing the method of any one of claims 14 to 15.