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WO2025066803A1 - Procédé et appareil de communication - Google Patents

Procédé et appareil de communication Download PDF

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Publication number
WO2025066803A1
WO2025066803A1 PCT/CN2024/116396 CN2024116396W WO2025066803A1 WO 2025066803 A1 WO2025066803 A1 WO 2025066803A1 CN 2024116396 W CN2024116396 W CN 2024116396W WO 2025066803 A1 WO2025066803 A1 WO 2025066803A1
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WO
WIPO (PCT)
Prior art keywords
feedback
terminal device
resource
resources
information
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2024/116396
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English (en)
Chinese (zh)
Inventor
徐姣姣
张懿
齐鸿
苏宏家
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Publication of WO2025066803A1 publication Critical patent/WO2025066803A1/fr
Pending legal-status Critical Current
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource

Definitions

  • the present application relates to the field of communication technology, and in particular to a communication method and device.
  • Beam management is an important technology proposed by the fifth-generation wireless communication system (5th generation, 5G) new radio (new radio, NR) for the second frequency range (frequency range 2, FR2). It is the process by which base stations and terminal devices acquire and maintain beam sets for sending and receiving, and then achieve high-gain communication with reasonable beam pairs.
  • 5G fifth-generation wireless communication system
  • NR new radio
  • the beam management process of FR2 is designed for base stations and terminal devices, that is, the base station first performs coarse beam scanning, the terminal device receives, measures, and feedbacks, the base station then performs fine beam scanning, and the terminal device performs beam adjustment.
  • the resources configured to receive the terminal device to feedback beam information may not be able to achieve beam feedback due to half-duplex or transmission conflicts, resulting in beam training failure and reduced reliability of beam training.
  • the embodiments of the present application provide a communication method and device for improving the reliability of beam training.
  • the present application provides a communication method, which can be performed by a first terminal device or a module (such as a chip) applied to the first terminal device.
  • the method includes: the first terminal device sends a first reference signal and first control information to a second terminal device in a first beam direction, the first reference signal is used for beam training of a sidelink, the first control information indicates a plurality of first feedback resources, and the plurality of first feedback resources are used to transmit feedback information of the first beam.
  • multiple feedback resources of the feedback information of the beam can be configured for the second terminal device, and resources can be reserved for the second terminal device to transmit the feedback information of the beam.
  • the second terminal device after the second terminal device obtains the feedback information of the first beam through measurement, it can transmit the feedback information of the first beam on the first feedback resource corresponding to the first beam, avoiding the problem of resource conflict in the sidelink scenario, thereby improving the reliability of beam training.
  • the multiple first feedback resources are orthogonal to each other.
  • multiple first feedback resources do not overlap with each other and are orthogonal to each other in the resource pool of the first terminal device, so that when a certain first feedback resource selected by the second terminal device is occupied and cannot transmit the feedback information of the first beam, the second terminal device can also select other first feedback resources to transmit the feedback information of the first beam, thereby avoiding the problem of feedback resource conflict.
  • the first control information is carried on a sidelink control channel PSCCH.
  • the first control information may be first-level sidelink control information SCI.
  • the first terminal device may receive feedback information of a first beam from the second terminal device on a first target feedback resource, where the first target feedback resource is included in multiple first feedback resources.
  • the second terminal device can determine at least one feedback resource from multiple first feedback resources to transmit feedback information of the first beam, thereby avoiding the problem of beam training failure due to feedback resource conflict, and further improving the reliability of beam training.
  • the first terminal device may also send first confirmation ACK information corresponding to the feedback information of the first beam in the first beam direction, and the first ACK information is used to release other feedback resources among multiple first feedback resources except the first target feedback resources.
  • the first terminal device after receiving the feedback information of the first beam, the first terminal device can send the first ACK information in the direction of the first beam to release other feedback resources and avoid other feedback resources being occupied, thereby reducing the overhead of system resources and improving the utilization of system resources.
  • the first terminal device may also send a second reference signal and second control information to the third terminal device in the second beam direction, where the second reference signal is used for beam training of the side link, and the second control information indicates multiple second feedback resources, and the multiple second feedback resources are used to transmit feedback information of the second beam.
  • the first terminal device can send a first reference signal to the second terminal device for beam training while also sending a second reference signal to the third terminal device for beam training, without interfering with each other.
  • the first beam and the second beam are different beams, and the multiple first feedback resources and the multiple second feedback resources are orthogonal to each other.
  • the third terminal device may be a different terminal device from the second terminal device. That is, the first terminal device may send reference signals to a plurality of different terminal devices in different beam directions to perform beam training.
  • the third terminal device may be the same terminal device as the second terminal device. That is, the first terminal device may send reference signals to the terminal device in different beam directions to perform beam training.
  • the first beam may be a coarse beam in a first coarse beam set sent by the first terminal device during beam training, may be a fine beam in a second fine beam set, or may be a candidate beam.
  • the present application provides a communication method, which can be performed by a second terminal device or a module (such as a chip) applied to the second terminal device.
  • the method includes: the second terminal device receives a first reference signal and first control information sent by the first terminal device in a first beam direction, the first reference signal is used for beam training of a sidelink, the first control information indicates a plurality of first feedback resources, and the plurality of first feedback resources are used to transmit feedback information of the first beam.
  • the second terminal device can determine multiple first feedback resources for transmitting feedback information of the first beam according to the first control information. In this way, after the second terminal device determines the feedback information of the first beam through measurement, it can transmit the feedback information of the first beam on the first feedback resource corresponding to the first beam, avoiding the resource conflict problem in the sidelink scenario, thereby improving the reliability of beam training.
  • the multiple first feedback resources are orthogonal to each other.
  • multiple first feedback resources do not overlap with each other and are orthogonal to each other in the resource pool of the first terminal device, so that when a first feedback resource determined by the second terminal device from the multiple first feedback resources is occupied and cannot transmit the feedback information of the first beam, the second terminal device can also select other first feedback resources to transmit the feedback information of the first beam, avoiding the problem of feedback resource conflict, thereby increasing the reliability of the feedback information of the transmission beam, and further increasing the reliability of beam training.
  • the first control information is carried on the PSCCH.
  • the second terminal device measures the first reference signal and generates feedback information of the first beam according to the measurement result of the first reference signal.
  • the second terminal device may also send feedback information of the first beam to the first terminal device on a first target feedback resource, where the first target feedback resource is included in multiple first feedback resources.
  • the second terminal device when the second terminal device feeds back feedback information of the first beam to the first terminal device, it can determine the first target feedback resource from multiple first feedback resources to transmit the feedback information, thereby ensuring the transmission of the beam feedback information.
  • the first target feedback resource is in an idle state; or, the first target feedback resource is in an occupied state, and the receiving end of the data transmitted by occupying the first target feedback resource is the first terminal device.
  • the second terminal device can send feedback information of the first beam to the first terminal device on the first target feedback resource in an idle state, so that the feedback information of the first beam can be sent to the first terminal device.
  • the second terminal device determines that the first target feedback resource is in an occupied state and the receiving end of the data transmitted on the first target feedback resource is the first terminal device, the feedback information of the first beam is spliced with the data on the first target feedback resource and sent together to the first terminal device. In this way, it can be ensured that the second terminal device sends the feedback information of the first beam to the first terminal device.
  • the second terminal device receives first ACK information corresponding to feedback information of the first beam sent by the first terminal device in the first beam direction, and the first ACK information is used to release other feedback resources in multiple first feedback resources except the first target feedback resource. After receiving the first ACK information, the second terminal device releases other feedback resources.
  • the second terminal device can release other feedback resources except the first target feedback resource among the multiple first feedback resources according to the first ACK information, thereby avoiding the occupation of other feedback resources, thereby reducing the overhead of system resources and improving the system efficiency. Resource utilization.
  • the second terminal device can also receive a third reference signal and third control information sent by the fourth terminal device in the third beam direction, where the third reference signal is used for beam training of the side link, and the third control information indicates multiple third feedback resources, and the multiple third feedback resources are used to transmit feedback information of the third beam.
  • the second terminal device when the second terminal device receives the first reference signal for beam training, it can also receive the third reference signal sent by the fourth terminal device for beam training.
  • the second terminal device measures the third reference signal and generates feedback information of the third beam according to the measurement result of the third reference signal.
  • the second terminal device may also send feedback information of the third beam to the fourth terminal device on a second target feedback resource, where the second target feedback resource is included in the plurality of third feedback resources.
  • the second terminal device can also determine the second target feedback resource from multiple third feedback resources to transmit feedback information of the third beam, so that the fourth terminal device can be informed of the beam sent by it in pair with the second terminal device.
  • the second target feedback resource is in an idle state; or, the second target feedback resource is in an occupied state, and the receiving end of the data transmitted by occupying the second target feedback resource is a fourth terminal device.
  • the second terminal device can send feedback information of the third beam to the fourth terminal device on the second target feedback resource in an idle state, so that the feedback information of the beam can be fed back during the beam training process.
  • the feedback information of the third beam can also be spliced with the data on the second target feedback resource and sent together to the fourth terminal device. In this way, it can be ensured that the second terminal device sends the feedback information of the first beam to the fourth terminal device.
  • the first target feedback resource and the second target feedback resource are different feedback resources.
  • the second terminal device feeds back beam feedback information to the first terminal device and the fourth terminal device at the same time, it can avoid using the same feedback resource to transmit the feedback information of the first beam of the first terminal device and the feedback information of the third beam of the fourth terminal device, thereby improving the reliability of beam training.
  • the present application further provides a communication device, which may be a first terminal device, having the functions of implementing the first aspect and each possible design example of the first aspect.
  • the functions may be implemented by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more units corresponding to the above functions.
  • the structure of the communication device may include a transceiver unit and a processing unit, which can perform the corresponding functions of the first terminal device in the above-mentioned first aspect or various possible design examples of the first aspect. Please refer to the detailed description in the method example for details, which will not be repeated here.
  • the structure of the communication device includes an interface circuit and one or more processors.
  • the communication device also includes a memory.
  • the interface circuit is used to send and receive data, and to communicate and interact with other devices in the communication system.
  • the one or more processors are configured to support the communication device to perform the corresponding functions of the first terminal device in the above-mentioned first aspect or each possible design example of the first aspect.
  • the memory is coupled to the one or more processors, which stores the necessary program instructions and data of the communication device.
  • the present application further provides a communication device, which may be a second terminal device, having the function of implementing the second aspect or each possible design example of the second aspect.
  • the function may be implemented by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more units corresponding to the above functions.
  • the structure of the communication device may include a transceiver unit and a processing unit, which can perform the corresponding functions of the second terminal device in the above-mentioned second aspect or various possible design examples of the second aspect. Please refer to the detailed description in the method example for details, which will not be repeated here.
  • the structure of the communication device includes an interface circuit and one or more processors.
  • the communication device also includes a memory.
  • the interface circuit is used to send and receive data, and to communicate and interact with other devices in the communication system.
  • the one or more processors are configured to support the communication device to perform the corresponding functions of the second terminal device in the above-mentioned second aspect or each possible design example of the second aspect.
  • the memory is coupled to the one or more processors, which stores the necessary program instructions and data of the communication device.
  • an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores program instructions, and when the program instructions are executed on a computer, the computer implements any one of the first aspect to the second aspect of the embodiment of the present application, and any one of the second aspect to the second aspect of the embodiment of the present application.
  • the computer-readable storage medium stores program instructions, and when the program instructions are executed on a computer, the computer implements any one of the first aspect to the second aspect of the embodiment of the present application, and any one of the second aspect to the second aspect of the embodiment of the present application.
  • the present application also provides a chip, which is coupled to a memory and is used to read and execute program instructions stored in the memory to implement the method described in any one of the first to second aspects above, and any possible designs of any one of the aspects.
  • an embodiment of the present application provides a computer program product including computer program code or instructions, which, when executed on a computer, enables the computer to implement the method described in any one of the first to second aspects above, and any possible designs of any one of the aspects.
  • FIG1A is a schematic diagram of a communication system
  • FIG1B is another schematic diagram of a communication system
  • FIG2 is a schematic diagram of a V2X scenario
  • FIG3 is a schematic diagram of a V2V scenario
  • FIG4 is a schematic diagram of a physical time slot and a logical time slot
  • FIG5 is a schematic diagram of a PSCCH resource location
  • FIG6 is a schematic diagram of a resource determination method
  • FIG7 is a schematic diagram of a time slot structure
  • FIG8 is a schematic diagram of a feedback resource conflict in an embodiment of the present application.
  • FIG9 is a flow chart of a communication method provided in an embodiment of the present application.
  • FIG10 is a schematic diagram of multiple feedback resources corresponding to a beam in an embodiment of the present application.
  • FIG11 is a schematic diagram of multiple feedback resources corresponding to multiple beams in an embodiment of the present application.
  • FIG12 is a schematic diagram of resource release in an embodiment of the present application.
  • FIG13 is a schematic diagram of beam information feedback in a single-transmit multiple-receive situation in an embodiment of the present application.
  • FIG14 is a schematic diagram of beam information feedback in a multiple-transmit and single-receive scenario in an embodiment of the present application
  • FIG15 is a schematic diagram of multiple feedback resources corresponding to different beams of different terminal devices in an embodiment of the present application.
  • FIG16 is another schematic diagram of resource release in an embodiment of the present application.
  • FIG17 is a schematic diagram of beam information feedback in a multi-transmit and multi-receive situation in an embodiment of the present application.
  • FIG18 is a schematic diagram of a structure of a communication device provided in an embodiment of the present application.
  • FIG19 is another schematic diagram of the structure of a communication device provided in an embodiment of the present application.
  • system and “network” in the embodiments of the present application can be used interchangeably.
  • multiple in the embodiments of the present application refers to two or more than two. In view of this, “multiple” can also be understood as “at least two” in the embodiments of the present application.
  • At least one can be understood as one or more, for example, one, two or more. For example, including at least one means including one, two or more, and there is no limit on which ones are included. For example, including at least one of A, B and C, then A, B, C, A and B, A and C, B and C, or A and B and C. Similarly, the understanding of descriptions such as "at least one" is also similar.
  • At least one of the following or its similar expressions refers to any combination of these items, including any combination of single items or plural items.
  • at least one of A, B and C includes A, B, C, AB, AC, BC or ABC.
  • And/or describes the association relationship of associated objects, indicating that three relationships can exist.
  • a and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone.
  • the character “/”, unless otherwise specified, generally indicates that the previous and next associated objects are in an “or” relationship.
  • ordinal numbers such as “first” and “second” mentioned in the embodiments of the present application are used to distinguish multiple objects, and are not used to limit the order, timing, priority or importance of multiple objects, and the descriptions of "first” and “second” do not limit the objects to be different.
  • the communication system applicable to the embodiments of the present application is first described in detail by taking the communication system shown in Figures 1A to 1B as an example.
  • the present application is applicable to a communication system that supports sidelink communication, and supports communication scenarios with and without network coverage, wherein the sidelink may also be referred to as a sidelink, and is referred to as a sidelink in the present application.
  • FIG1A shows a communication system to which the technical solution provided in an embodiment of the present application is applicable.
  • the communication system may include a terminal device 101 and a terminal device 102.
  • the terminal device 101 and the terminal device 102 may communicate via a side link.
  • the terminal device 101 and the terminal device 102 may interact via a near field communication 5 (proximity communication, PC5) interface.
  • the communication system may also include more terminal devices, which are not shown in FIG1A .
  • the communication system may further include a network device 103, as shown in FIG1B .
  • the network device 103 may communicate with the terminal device 101, and the network device 103 may also communicate with the terminal device 102.
  • the terminal device 101 and the terminal device 102 may be within the coverage of the network device 103; or one of the terminal device 101 and the terminal device 102 is within the coverage of the network device 103, and the other is outside the coverage of the network device 103 ( FIG1B takes the example that the terminal device 101 is within the coverage of the network device 103, and the terminal device 102 is outside the coverage of the network device 103); or both the terminal device 101 and the terminal device 102 are outside the coverage of the network device 103.
  • the communication system may be a V2X communication system, wherein V2X may include direct communication between vehicles (vehicle-to-vehicle, V2V), vehicles and roadside infrastructure (vehicle-to-infrastructure, V2I), vehicles and pedestrians (vehicle-to-pedestrian, V2P), and vehicles and networks (vehicle-to-network, V2N) or vehicles to any entity V2X link, as shown in FIG2.
  • V2X may include direct communication between vehicles (vehicle-to-vehicle, V2V), vehicles and roadside infrastructure (vehicle-to-infrastructure, V2I), vehicles and pedestrians (vehicle-to-pedestrian, V2P), and vehicles and networks (vehicle-to-network, V2N) or vehicles to any entity V2X link, as shown in FIG2.
  • the terminal device may be a device that provides voice/data to users, such as a handheld device with wireless connection function, a vehicle-mounted device, etc.
  • the terminal device may include user equipment (UE), sometimes also called terminal, access point (AP), UE station, remote station, wireless communication equipment, or user device, etc.
  • UE user equipment
  • AP access point
  • UE station UE station
  • remote station wireless communication equipment
  • wireless communication equipment or user device, etc.
  • the terminal device can be a mobile phone, a tablet computer (pad), a computer with wireless transceiver function, a virtual reality (VR) terminal, an augmented reality (AR) terminal, a wireless terminal in industrial control, a whole vehicle, a wireless communication module in a whole vehicle, a vehicle-mounted telematics box (T-box), a road side unit (RSU), a wireless terminal in unmanned driving, a smart speaker in the Internet of Things (IoT) network, a wireless terminal device in telemedicine, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, and a wireless terminal device in a smart city.
  • IoT Internet of Things
  • M2M/MTC machine-to-machine/machine-type communications
  • the terminal device may also be a restricted device, such as a device with low power consumption, or a device with limited storage capacity, or a device with limited computing capacity, etc.
  • a restricted device such as a device with low power consumption, or a device with limited storage capacity, or a device with limited computing capacity, etc.
  • it includes information sensing devices such as barcodes, radio frequency identification (RFID), sensors, global positioning systems (GPS), or laser scanners, etc.
  • RFID radio frequency identification
  • GPS global positioning systems
  • laser scanners etc.
  • the terminal device may also be a wearable device.
  • Wearable devices may also be referred to as wearable smart devices, which are a general term for wearable devices that are intelligently designed and developed using wearable technology for daily wear, such as glasses, gloves, watches, clothing, and shoes.
  • a wearable device is a portable device that is worn directly on the body or integrated into the user's clothes or accessories. Wearable devices are not only hardware devices, but also powerful functions achieved through software support, data interaction, and cloud interaction.
  • wearable smart devices include full-featured, large-sized, and fully or partially independent of smartphones, such as smart watches or smart glasses, as well as devices that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various types of smart bracelets and smart jewelry for measuring vital signs.
  • the terminal device may also be a V2X device, such as a smart car (or intelligent car), a digital car (or digital car), an unmanned car (or driverless car or pilotless car or automobile), an autonomous car, or a
  • the terminal device can also be a device in device-to-device (D2D) communication, such as an electricity meter or water meter.
  • D2D device-to-device
  • the terminal device can also be a terminal device in an IoT system.
  • IoT is an important part of the future development of information technology. Its main technical feature is to connect objects to the network through communication technology, thereby realizing an intelligent network that interconnects people and machines and things.
  • the various terminal devices introduced above if located on a vehicle (for example, placed in a vehicle or installed in a vehicle), can be considered as vehicle-mounted terminal devices, which are also called on-board units (OBU).
  • the terminal device of the present application can also be an on-board module, on-board module, on-board component, on-board chip or on-board unit built into the vehicle as one or more components or units.
  • the vehicle can implement the method of the present application through the built-in on-board module, on-board module, on-board component, on-board chip or on-board unit.
  • the sending terminal device refers to the entity that sends the information
  • the receiving terminal device refers to the entity that receives the information.
  • the receiving terminal device and the sending terminal device are relative, and their roles can be interchanged, that is, the receiving terminal device can also have a sending function, and the sending terminal device can also have a receiving function, without restriction.
  • the network device may refer to a device in an access network that communicates with a wireless terminal device through one or more cells at an air interface.
  • an access network (AN) device such as a base station (e.g., access point).
  • AN access network
  • base station e.g., access point
  • V2X vehicle-to-everything
  • RSU road side unit
  • the network device may include an evolved base station (NodeB or eNB or e-NodeB, evolutional Node B) in a long term evolution (LTE) system or long term evolution-advanced (LTE-A), or may include an evolved packet core network (EPC), the fifth generation mobile communication technology (the 5th generation, 5G), a next generation node B (gNB) in a new radio (NR) system (also referred to as an NR system), or may include a centralized unit (CU) and a distributed unit (DU) in a cloud radio access network (Cloud RAN) system, a satellite, a drone, a balloon or an airplane, etc., and the embodiments of the present application are not limited.
  • NodeB or eNB or e-NodeB, evolutional Node B in a long term evolution (LTE) system or long term evolution-advanced (LTE-A)
  • EPC evolved packet core network
  • the 5G fifth generation mobile communication technology
  • gNB next generation no
  • C-V2X Cellular vehicle to everything
  • C-V2X communication technology is a V2X communication technology developed based on cellular systems. It utilizes and enhances current cellular network functions and elements to achieve low-latency and high-reliability communications between various nodes in vehicle networks.
  • LTE long-term evolution
  • C-V2X evolves from LTE-V2X to NR-V2X.
  • the communication system based on C-V2X communication technology can also be called a distributed half-duplex SL communication system, or a fully distributed half-duplex SL communication system.
  • V2X can refer to the relevant content of Figure 2 and will not be repeated.
  • V2X communication technology has great potential in reducing vehicle collision accidents, and therefore the corresponding number of casualties.
  • the advantages of V2X communication technology are not limited to improving safety.
  • Vehicles that can perform V2X communication can help better manage traffic, further promote green transportation and lower energy consumption.
  • Intelligent transportation system (ITS) is an application that combines V2X communication technology.
  • vehicle users vehicle UE, V-UE
  • V-UE vehicle users
  • V-UE vehicle users
  • V-UE vehicle UE
  • V-UE vehicle users
  • V-UE vehicle users
  • V-UE can send some of their own information, such as location, speed, intention (such as turning, merging or reversing), etc., periodically and some non-periodic event-triggered information to the surrounding V-UE.
  • V-UE will also receive information from surrounding users in real time.
  • 5G NR V2X can support lower transmission latency, more reliable communication transmission, higher throughput, better user experience, and meet the needs of a wider range of application scenarios.
  • V2V is a special case of V2X, which focuses on SL communication between vehicles.
  • V2V communication vehicles on the road can obtain driving information, sensor information, etc. of other vehicles in real time, which plays an important role in enabling autonomous driving.
  • the head vehicle sends vehicle control information to the formation in a V2V manner to enable subsequent vehicles to achieve unmanned driving.
  • V2V For extended sensors, after a vehicle senses other vehicles, it informs other vehicles of this sensor information through V2V, solving the problem of inaccurate environmental perception caused by the limited sensor capabilities of the vehicle itself.
  • V2V The communication technology can be extended and applied to D2D communication in any system.
  • the R16 standard defines two resource allocation modes for SL communication: mode 1 and mode 2.
  • mode 1 the base station allocates transmission resources to V2X through the Uu (UTRAN-to-UE) air interface, so the terminal device in mode 1 must be within the network coverage.
  • the spectrum resources of SL can be shared with uplink communication resources.
  • mode 1 and mode 2 can be allocated to different resource pools or share resource pools. Resource pool sharing can improve resource utilization efficiency, but it is also easy to cause conflicts between mode 1 and mode 2. Therefore, the terminal device in mode 1 will notify the terminal device in mode 2 of the resources allocated for its future transmission.
  • the terminal device can obtain the SL resource pool configuration information and/or SL bandwidth part (BWP) configuration information by receiving the system information block (SIB) of the network device, the cell-level (cell-specific) radio resource control (RRC) signaling or the terminal user level (UE-specific) RRC signaling.
  • SIB system information block
  • RRC radio resource control
  • UE-specific terminal user level
  • the terminal device may also use pre-configured SL resource pool configuration information or SL BWP configuration information.
  • the SL resource pool configuration information includes resource pool resource information, and the resource pool resource information is used to indicate the SL resource pool.
  • a resource pool is a collection of time-frequency resources used for sideline communication between terminal devices.
  • a resource pool may include code domain resources.
  • the resources of the resource pool are used to include resources for the terminal device to send and receive at least one of the following physical channels:
  • the physical layer sidelink control channel (PSCCH) is used to carry sidelink control information (SCI).
  • SCI sidelink control information
  • the physical sidelink shared channel (PSSCH) is used to carry at least one of control information, data, and sidelink channel state information (CSI) feedback information.
  • PSSCH physical sidelink shared channel
  • CSI sidelink channel state information
  • PSDCH Physical layer sidelink control channel
  • the physical sidelink feedback channel is used for sidelink feedback information.
  • the sidelink feedback information can be used for feedback of data information, including hybrid automatic repeat request (HARQ) response feedback information.
  • HARQ hybrid automatic repeat request
  • acknowledgement (ACK) or negative acknowledgement (NACK) it can also include CSI feedback information, and can also be used to indicate at least one of the following information: energy saving information, resource auxiliary information (including recommended resources, not recommended resources, resource collision, resource reservation conflict, half-duplex conflict that has occurred in the past or will occur in the future, etc.).
  • the physical sidelink broadcast channel (PSBCH) is used to carry information related to sidelink synchronization.
  • the service types carried by PSBCH may include unicast, multicast and/or broadcast communication types.
  • PSFCH, PSBCH, PSCCH and PSSCH are merely examples of side feedback channels, side discovery channels, side control channels and side data channels, respectively.
  • data channels and control channels may have different names, and the embodiments of the present application do not limit this.
  • a time unit may be one or more symbols, or one or more time slots, or one or more mini-slots, or one or more subframes, or one or more frames, etc.
  • multiple time units may be continuous in time or discrete. It should be understood that multiple time units within a resource pool are logically continuous.
  • the SL resource pool is used for sideline communication between terminal devices.
  • the SL resource pool may include, for example, time domain resources, frequency domain resources, and code domain resources, etc., without limitation.
  • time slots 1 to 8 are time slots that are continuous in time, and such time slots are called physical time slots.
  • the continuous time slots contained in the resource pool i.e., time slot 1’, time slot 2’, time slot 3’, and time slot 4’
  • Such time slots that are logically continuous but not necessarily continuous in time are called logical time slots.
  • the frequency domain of the SL resource pool includes one or more frequency domain units, which can be a resource element (RE), several REs, a resource block (RB), several RBs, a sub-channel, or several sub-channels.
  • the size of the sub-channel that is, the number of RBs that a sub-channel includes one or more continuous or interlaced in the frequency domain, can be 10, 12, 15, 20, 25, 50, 75, and 100 integers.
  • the SL resource pool configuration information may also include configuration information of the physical sidelink control channel (PSCCH), and the configuration information of the PSCCH includes the number of symbols occupied by the PSCCH in a time slot and the number of RBs occupied by the PSCCH in a subchannel.
  • the SL BWP configuration information may include SL resource pool information, which is used to configure the number of resource pools included in the BWP.
  • the SL BWP configuration information may include SL bandwidth information, which is used to indicate the bandwidth size for SL communication, for example, indicating that the SL bandwidth is 20 megahertz (MHz).
  • the SL BWP configuration information may also include SL symbol information, which is used to indicate the starting SL symbol position on a time slot and the number of continuous SL symbols occupied.
  • the SL BWP configuration information may also include SL subcarrier spacing and cyclic prefix information, which are used to indicate the subcarrier spacing and cyclic prefix used for SL communication.
  • the cyclic prefix indicates an extended cyclic prefix or a normal cyclic prefix.
  • the SL BWP configuration information may also include SL resource pool configuration information.
  • time unit is described as a time slot, but the time unit is not limited to being a time slot.
  • time unit is described as a subchannel, but the frequency domain unit is not limited to being a subchannel.
  • the SCI in the SL communication system is divided into the first-level SCI and the second-level SCI.
  • the first-level SCI is carried on the physical sidelink control channel (PSCCH), and the second-level SCI is carried on the corresponding physical sidelink shared channel (PSSCH).
  • PSCCH physical sidelink control channel
  • PSSCH physical sidelink shared channel
  • the first-level SCI is used to schedule the second-level SCI and PSSCH. Since the SL communication system is a distributed communication system, all terminal devices need to correctly decode the first-level SCI before decoding the second-level SCI and PSSCH.
  • the resource location of PSCCH is relatively fixed, and the first-level SCI format information carried is also relatively unique, that is, the terminal device does not need to blindly detect the time-frequency resource location where the PSCCH is located, nor does it need to blindly detect SCI of different formats.
  • the terminal device only needs to detect whether the first-level SCI exists at the fixed PSCCH time-frequency resource location.
  • PSCCH may exist in each subchannel in each time slot, that is, the time domain starting position of a PSCCH is the second symbol used for SL transmission in each time slot, the length is 2 or 3 symbols (determined by the resource pool configuration information), the frequency domain position is the smallest PRB index of each subchannel, and the length is at least 10 PRBs (determined by the resource pool configuration information) but not exceeding the size of the subchannel, as shown in Figure 5.
  • the first-level SCI may include a resource reservation period field, a frequency resource assignment field, and a time resource assignment field.
  • the resource reservation period field is used to indicate the periodic resources reserved (or reserved) for transmitting PSSCH.
  • the frequency resource assignment field is used to indicate the frequency domain resources used to transmit PSSCH.
  • the time resource assignment field is used to indicate the time domain resources used to transmit PSSCH.
  • the first-level SCI also includes other fields, such as a priority field, a second-level SCI format field, a demodulation reference signal (DMRS) port number field, a modulation and demodulation scheme field, or a reserved field, etc., which are not listed here one by one.
  • DMRS demodulation reference signal
  • the resource reservation period field is used to indicate the resources for periodic reservation transmission of PSSCH.
  • the value of the resource reservation period field is configured by the network device, or is preconfigured or predefined.
  • the base station indicates the value of the resource reservation period through RRC signaling.
  • the RRC signaling can be determined by the high-level parameter s1 resource reservation period 1 (sl-resou rceteserve period 1).
  • the transmission resources of the transmitter in the mode 2 resource selection method do not depend on the base station.
  • the transmitter selects the transmission resources for communication within the resource selection window according to the results of its own perception window. Assuming that the transmitter triggers resource selection in time slot n, the specific resource steps are as follows, and the selection process is shown in Figure 6.
  • Step 1 Determine the candidate resources R x,y in units of one time slot and L subCH consecutive subchannels, and the resource selection window [n+T 1 ,n+T 2 ], where Determined by Table 1, ⁇ SL is the configured subcarrier spacing, and T 1 is selected based on implementation.
  • T 2min is configured by the higher layer, if T 2min is less than the remaining PDB (data packet delay), then T 2min ⁇ T 2 ⁇ PDB (data packet delay), and T 2 is selected based on implementation; otherwise T 2 is equal to the remaining PDB.
  • Step 2 Determine the perception window Where T 0 is configured by high-level parameters. Determined from Table 2.
  • Step 3 Determine the threshold value Th( pi , pj ) of the reference signal received power (RSRP).
  • the RSRP threshold value is related to the prio TX of the data to be sent and the priority prio RX indicated by the received SCI.
  • Th( pi , pj ) is specifically the prio RX +(prio TX -1)*8th threshold value in the RSRP threshold value set configured in the resource pool.
  • Step 4 Initialize the available resource set S A , including all time-frequency resources in the resource selection window.
  • Step 5 Exclude the following time-frequency resources from SA : the time slots of all periodic resource reservations configured in the resource pool corresponding to the unperceived time slots (transmitted time slots) in the perception window.
  • step 5 if the time-frequency resources excluded by SA are less than X% of the total resources in the resource selection window, re-execute the initialization of step 4.
  • Step 6 Continue to exclude the following time-frequency resources from SA : the decoding of the received first-level SCI is successful, and the result of RSRP measurement of the PSSCH demodulation reference signal (DMRS) of the time-frequency resources reserved by the received first-level SCI is higher than the RSRP threshold determined in step 3, and the time-frequency resources reserved by the received first-level SCI are within the resource selection window, including the retransmission resources indicated by the first-level SCI and the periodically reserved resources.
  • DMRS PSSCH demodulation reference signal
  • Step 7 If the remaining resources in SA are less than X% of the total resources in the resource selection window, where the value of X% is configured by the resource pool and is related to prio TX , then the RSRP threshold determined in step 3 is increased by 3 dB each time until the remaining resources in SA are not less than X% of the total resources in the resource selection window, and step 4 is continued.
  • MAC medium access control
  • a time-frequency resource (r 0 , r 1 , r 2 , ...) is randomly selected in SA for sending data. Before sending, a resource re-evaluation is performed on (r 0 , r 1 , r 2 , ). After the re-evaluation, a preemption detection is performed on the resource (r′ 0 , r′ 1 , r′ 2 , ...) selected from SA .
  • the user is in at least time slot m-T3
  • the UE can perform resource re-evaluation and preemption detection based on additional triggering before and after time slot m-T3.
  • the method of determining whether (r 0 , r 1 , r 2 , ...) and (r′ 0 , r′ 1 , r′ 2 , ...) need to be excluded is the same as step 7, and one of the following conditions is met:
  • Figure 7 shows the time slot structure of SL, which includes automatic gain control (AGC), PSCCH, PSSCH, DMRS, GAP (guard period), etc.
  • SL CSI-RS only supports unicast transmission and is sent with data in the PSSCH area of the transmit time slot. At the same time, it is not transmitted on symbols containing PSCCH, second-level SCI or PSSCH DMRS.
  • Each PRB in PSSCH uses the same pattern for SL CSI-RS.
  • the transmission time and frequency resources of SL CSI-RS are mainly indicated by the first-level SCI.
  • SCI in NR V2X is transmitted in two levels.
  • the introduction of the second-level SCI makes the SCI design more flexible, supporting unicast, multicast and broadcast transmission in NR V2X, while LTE V2X only supports broadcast.
  • the main advantages of two-level SCI are:
  • the first-level SCI has a fixed size that is independent of the transmission type, avoiding blind detection by the receiving end user;
  • the first-level SCI indicates the resources of the second-level SCI carried in the PSSCH;
  • a second level SCI with different payload sizes depending on the transmission type reduces the complexity of SCI decoding, not only for the transmitter, but also for perceptual terminal devices that only need to detect and decode the first level SCI to know which resources are reserved at the receiver.
  • the first-level SCI in NR V2X is carried on the PSCCH and the second-level SCI is carried on the corresponding PSSCH.
  • the PSCCH carries the first-level SCI containing the second-level SCI control information associated with the PSSCH.
  • the first-level SCI indicates the frequency resources of the PSSCH carrying the current (re)transmission of the transport block (TB) and the resources reserved for up to two retransmissions of the TB. If the UE reserves resources for semi-static PSSCH, the first-level SCI also indicates the resource reservation period.
  • the first-level SCI includes the priority of the associated PSSCH, and the format and size of the second-level SCI.
  • the first-level SCI also indicates the modulation and coding scheme (MCS) of the data payload carried in the associated PSSCH.
  • MCS modulation and coding scheme
  • the DMRS associated with the PSSCH in NR V2X can be carried on different symbols within the PSSCH time slot.
  • the PSSCH DMRS can be (pre)configured with multiple time patterns, and the first-level SCI indicates the specific time pattern used by the associated PSSCH.
  • the first level SCI also provides the number of ports for the PSSCH DMRS, which can be equal to one or two, which indicates the number of layers (i.e., the number of data streams) supported in the PSSCH. Therefore, by utilizing multiple transmit and receive antennas, up to two data streams can be sent in the PSSCH in the NR V2X SL.
  • the SCI is divided into two levels, allowing non-target receiving terminal devices to decode only the first-level SCI for channel sensing, that is, for determining the resources reserved for other transmissions.
  • the resource reservation period field in the first-level SCI is used to indicate the periodic resources reserved for transmitting PSSCH. After the non-target receiving terminal device receives the first-level SCI and successfully decodes it, it can obtain the periodic resources reserved for other transmissions.
  • the second-level SCI provides the additional control information required by the receiving terminal device that needs to transmit.
  • PSSCH carries the second-level SCI and the data payload composed of TBs.
  • the second-level SCI carries information for decoding PSSCH and supporting HARQ feedback and CSI reporting, indicating the first-layer source identity (identifier, ID) and destination ID of the transmission, representing the physical layer identifier of the intended recipient (receiving end) of the transmitter and TB.
  • the layer 1 source ID is used to allow the receiving end to know the identity of the transmitter, and then determine the PSFCH of the HARQ feedback.
  • the second-level SCI also carries a 1-bit new data indicator to specify whether the TB sent in the PSSCH corresponds to a new data transmission or a retransmission.
  • the HARQ process ID is also included in the second-level SCI in order to identify the TB.
  • the second-level SCI also indicates whether the HARQ feedback for the PSSCH is enabled or disabled.
  • the transmitter sends the CSI request and SL CSI-RS in the first-level SCI, triggering the receiver of the unicast link to feedback the CSI report.
  • the transmitter can configure the receiver's non-periodic CSI reporting.
  • the transmitter first sends the SCI, which contains the user ID of the SL CSI-RS, the SL CSI-RS transmission information, including the time-frequency resource information, resource ID, scrambling code ID, etc. of the SL CSI-RS.
  • the SCI can also include a time offset to instruct the receiver to send CSI feedback information in a specific subframe or time slot.
  • the receiver measures the CSI based on the SL CSI-RS sent by the transmitter, and feeds back the CSI through the PSSCH sent by the receiver to the transmitter.
  • the CSI feedback of the receiver is carried in the MAC control element (MAC CE).
  • MAC CE MAC control element
  • the receiver In order to avoid CSI timeout, the receiver is expected to feed back the CSI report within the maximum time.
  • the latency bound is determined by the transmitter and sent to the receiver through PC5-RRC signaling.
  • a beam is a communication resource and can be divided into a transmit beam (or transmission beam) and a receive beam.
  • the technology for forming a beam can be a beamforming technology or other technical means.
  • Beamforming includes transmit beamforming and receive beamforming.
  • the transmit beam refers to a beam with spatial directivity formed by a transmitting terminal device sending a signal with a certain beamforming weight.
  • the receive beam refers to a beam with spatial directivity formed by a receiving terminal device receiving a signal with a certain beamforming weight.
  • Transmit beamforming means that when a transmitting device with an antenna array transmits a signal, a specific amplitude and phase are set on each antenna element of the antenna array, so that the transmitted signal has a certain spatial directivity, that is, the signal power is high in some directions and low in some directions.
  • the direction with the highest signal power is the direction of the transmit beam.
  • the specific amplitude and phase added are the beamforming weights.
  • Receive beamforming means that when a receiving device with an antenna array receives a signal, a specific amplitude and phase are set on each antenna element of the antenna array, so that the power gain of the received signal is directional, that is, the power gain is high when receiving signals in certain directions, and the power gain is low when receiving signals in certain directions.
  • the direction with the highest power gain when receiving a signal is the direction of the receiving beam.
  • the antenna array includes multiple antenna elements, and the specific amplitude and phase added are the beamforming weights.
  • Using a certain beam to send a signal can be understood as using a certain beamforming weight to send a signal.
  • Using a certain beam to receive a signal can be understood as using a certain beamforming weight to receive a signal.
  • Different beams can be understood as different resources or different spatial directions, without limitation.
  • the same information or different information can be sent using (or through) different beams.
  • the transmitting terminal device and the receiving terminal device can generate one or more beams. Before transmitting data, the transmitting terminal device and the receiving terminal device need to perform beam alignment.
  • Wireless communications have undergone a technological evolution from the first generation of analog communication systems to the new 5G NR systems.
  • beamforming based on multiple input multiple output (MIMO) is an important aspect.
  • Beamforming can be regarded as a spatial filtering process. Its technical principle is to limit the transmission or reception of signals to a certain angle range, thereby increasing gain and reducing interference.
  • Beamforming has already appeared in the second generation of mobile communication systems (2nd generation, 2G), when it was achieved by selecting different transmitting or receiving antennas.
  • the third generation of mobile communication systems (3rd generation, 3G) and later communication systems tend to use phased arrays to achieve beamforming.
  • NR In NR systems, beamforming becomes more important. It is not only an important method to improve spectrum efficiency, but also an important support for using FR2 above 6 GHz. In order to perform beamforming efficiently and reasonably, NR has designed a beam management process.
  • Beam management is an important technology proposed by 5G NR for FR2, including two important functions: beam training and beam failure recovery.
  • Beam training includes transmit beam training and receive beam training, which can be divided into three steps. The operations of each step are summarized as follows:
  • the base station sends RS based on a set of transmit beams.
  • the transmit beam set may include one or more transmit beams.
  • One transmit beam may correspond to one transmit direction, and multiple different transmit beams may correspond to different transmit directions.
  • the terminal device may receive the RS through the receive beam, measure and feedback the RS, and select the transmit beam of the base station and the receive beam of the terminal device.
  • S2 Based on S1, the base station sends RS based on a smaller set of transmit beams.
  • a smaller transmit beam set may be a subset of the transmit beam set in S1, or may be a narrower beam set corresponding to the direction of one or more transmit beams included in the transmit beam set in S1.
  • the terminal device may receive the RS through the receive beam, measure and provide feedback on the RS, and improve the transmit beam of the base station.
  • S3 The base station sends RS using one transmit beam.
  • One of the transmission beams in S3 may be a transmission beam of the base station improved by the terminal device in S2.
  • the terminal device receives RSs using different reception beams, measures and feeds back the RSs, and improves the reception beam of the terminal device.
  • the beam training of 5G NR downlink can be carried out.
  • S1 and S2 are the processes of the base station to perform the transmission beam training.
  • RS can be CSI-RS.
  • the base station will configure several beam directions, each of which corresponds to a CSI-RS resource and the time-frequency resources that the terminal device should use for feedback.
  • the base station sends CSI-RS in each direction periodically or non-periodically in a scanning manner.
  • the terminal device measures the RSRP of the CSI-RS and obtains the channel state information reference signal resource indicator (CSI-RS resource indicator, CRI) of the CSI-RS.
  • CRI channel state information reference signal resource indicator
  • the terminal device selects one or several RSRP values and the corresponding CRI by comparison and feeds them back to the base station on a given time-frequency resource.
  • the base station uses the feedback information to determine the transmit beam to be used.
  • the uplink beam training also uses a similar process, but the reference signal used is different.
  • the beam management process of FR2 is designed for base stations and terminal devices.
  • each terminal device in the SL communication system is in a peer-to-peer relationship. Without unified coordination and scheduling by the BS, whether the terminal device receives, sends or transmits beam feedback information cannot be determined in the distributed system.
  • UE-to-UE beam management uses standalone/non-standalone CSI-RS for beam training, and the transmitting terminal device can configure the non-periodic CSI reporting of the receiving terminal device.
  • the resources configured to feedback beam information to the receiving terminal device may not be able to realize the feedback of beam information due to problems such as half-duplex or transmission conflicts, resulting in beam training failure and reduced reliability of beam training.
  • terminal device 101 sends a reference signal to terminal device 102 in the direction of beam 1, and terminal device 102 receives the reference signal.
  • the terminal device 101 sends a reference signal corresponding to beam 1.
  • the terminal device 101 sends a reference signal to the terminal device 102 in the direction of beam 2, and the terminal device 102 receives the reference signal corresponding to beam 2.
  • the terminal device 102 measures the reference signals in the directions of beam 2 and beam 1, and determines that beam 2 is the optimal transmission beam based on the measurement results.
  • the terminal device 102 feeds back feedback information of its corresponding optimal transmission beam 2 to the terminal 101.
  • the feedback resources of the terminal device 102 configured by the terminal device 101 for transmitting the feedback information of the beam are not available.
  • the terminal device 102 needs to send data to the terminal device 103 at the feedback resource position of the feedback information of the feedback beam 2, so that the feedback information of beam 2 cannot be fed back, resulting in the failure of the beam training process in SL FR2.
  • an embodiment of the present application provides a communication method to reduce the problem that feedback information of the beam cannot be fed back due to resource conflicts in the SL communication system, and improve the reliability of beam training.
  • the second terminal device may determine the positions of the plurality of first feedback resources according to the first control information.
  • the second terminal device determines the states of the plurality of first feedback resources according to the positions of the plurality of first feedback resources.
  • the states of the first feedback resources include an occupied state and an idle state. Exemplarily, the idle state means that the first feedback resource is not used.
  • the occupied state means that the second terminal device receives and sends data with other terminal devices on the feedback resource, or sends data with the first terminal device.
  • the second terminal device may then send the feedback information of beam 1 at the position of feedback resource 2, and so on.
  • the second terminal device may send the feedback information of beam 1 on feedback resource 2.
  • the order in which the second terminal device determines the target feedback resource among multiple feedback resources may be a time domain order of the resource location or a frequency domain order.
  • the second terminal device may also use the first feedback resource of the first terminal device, which is in an occupied state and occupies the first target feedback resource to transmit data, as the first target feedback resource.
  • the second terminal device determines that beam 1 is the optimal beam, and the feedback resources corresponding to beam 1 are feedback resource 1, feedback resource 2, and feedback resource 3.
  • the second terminal device may first send the feedback information of beam 1 through MAC CE at the position of feedback resource 1.
  • the second terminal device also needs to send data to the first terminal device at the position of feedback resource 1.
  • the second terminal device can frame the data together with the feedback information of beam 1 carried on the MAC CE, and send it to the first terminal device on feedback resource 1.
  • the second terminal device can send a data frame to the first terminal device on the data channel of PSSCH to complete the feedback of beam 1.
  • the first terminal device may release the feedback resource by executing step S904-1 or S904-2.
  • the above resource release step is described below.
  • the first ACK information is used to release other feedback resources except the first target feedback resource in multiple first feedback resources.
  • the first terminal device generates the first ACK information after receiving the feedback information of the first beam.
  • the first terminal device sends the first ACK information in the direction of the first beam, which can enable the terminal device that receives the first ACK information to release other feedback resources and reduce the overhead of system resources.
  • the first terminal device can send the first ACK information at the time-frequency position of the PSFCH corresponding to the first target feedback resource.
  • the release process can be executed by the terminal device that receives the first ACK information on the PSFCH. That is, the terminal device that performs the release process can be a receiving terminal device in beam training, or it can be a sending terminal device.
  • the first terminal device After receiving the feedback information of the first beam, the first terminal device generates a release signaling.
  • the release signaling can be located at the time-frequency position of the PSFCH.
  • the release signaling can occupy a 1-bit position on the PSFCH, with "0" indicating that the terminal device receiving the release signaling does not release other feedback resources, and "1" indicating that the terminal device receiving the release signaling releases other feedback resources.
  • the first terminal device can send a release signaling in the direction of the first beam, which can enable the terminal device receiving the release signaling to release other feedback resources and reduce the overhead of system resources.
  • UE-D in addition to the second terminal device, there may be other terminal devices, such as UE-D.
  • UE-D also receives the first control information sent by the first terminal device to the second terminal device.
  • UE-D can make a reservation for multiple first feedback resources corresponding to the first beam based on the received first control information.
  • UE-D can also receive feedback information of the first beam fed back to the first terminal device by the second terminal device.
  • UE-D can also receive the first ACK information or release signaling sent by the first terminal device, and release other feedback resources in the multiple first feedback resources according to the first ACK information or release signaling.
  • Figure 9 shows a method for determining multiple feedback resources corresponding to the first beam indicated by the first control information on the PSCCH of the beam frame of the first terminal device in the case of single transmission and single reception, so that the second terminal device can feedback the beam information on the feedback resource corresponding to the optimal beam received from the first terminal device, thereby solving the problem of feedback resource conflict.
  • the embodiments of the present application also provide a method for beam information feedback in a single-transmit multiple-receive situation.
  • the first terminal device when it sends a first reference signal and first control information to the second terminal device in the first beam direction, it can also send a second reference signal and second control information to the third terminal device in the second beam direction.
  • the second reference signal is used for beam training of the side link, which is the same as the first reference signal.
  • the second control information indicates multiple second feedback resources, and the multiple second feedback resources are used to transmit feedback information of the second beam.
  • the process by which the first terminal device generates the second control information is the same as the process by which the first terminal device generates the first control information in Figure 9, and will not be repeated here.
  • the second terminal device and the third terminal device generally refer to the receiving terminal
  • the first terminal device is a receiving terminal device in the first beam direction
  • the third terminal device is a receiving terminal device in the second beam direction.
  • the receiving terminal device in the first beam direction and the receiving terminal device in the second beam direction can be one or more, which is not limited here.
  • the first beam and the second beam are different beams, and the multiple first feedback resources are orthogonal to each other with the multiple second feedback resources.
  • the multiple first feedback resources are orthogonal to each other in the time domain, or orthogonal to each other in the frequency domain.
  • the multiple first feedback resources corresponding to the first beam are resources 1, 2, and 3, and the multiple second feedback resources corresponding to the second beam are resources 4, 5, and 6; resources 1, 2, 3, 4, 5, and 6 are orthogonal to each other in the time domain.
  • the second beam is any one of the transmit beams in the transmit beam set for beam scanning by the first terminal device during beam training between the first terminal device and the third terminal device.
  • the transmit beam set can be a coarse beam set for beam scanning by the first terminal device in the above-mentioned beam training S1 step, or a fine beam set for beam scanning in the beam training S2 step, or a candidate beam set for beam scanning in the beam training S3 step.
  • the coarse beam set includes a greater number of transmit beams than the fine beam set
  • the candidate beam set includes one transmit beam.
  • the first electronic device can send reference signals and control information to the third terminal device in different transmit beam directions.
  • the beam feedback process between the first terminal device and the second terminal device is the same as the beam feedback process shown in FIG. 9 above, and will not be repeated here.
  • the third terminal device receives the second reference signal and the second control information sent by the first terminal device in the second beam direction.
  • the third terminal device measures the second reference signal, and determines that the second beam is the optimal beam between the first terminal device and the third terminal device according to the measurement result of the second reference signal.
  • the third terminal device generates feedback information of the second beam, and determines a target feedback resource from a plurality of second feedback resources to transmit the feedback information of the second beam.
  • the process of determining the target feedback resource from a plurality of second feedback resources by the third terminal device is the same as the process of determining the first target feedback resource by the second terminal device in FIG. 9, and will not be repeated here.
  • the third terminal device sends the feedback information of the second beam to the first terminal device on the determined target feedback resource.
  • the first terminal device can perform the above-mentioned S904-1 or S904-2 steps to realize the release of resources.
  • the first terminal device can send the second ACK information corresponding to the feedback information of the second beam in the second beam direction.
  • the second ACK information is used to release the second feedback resources in the plurality of second feedback resources except the target feedback resources for transmitting the feedback information of the second beam.
  • the third terminal device releases the second feedback resources except the target feedback resources for transmitting the feedback information of the second beam. In this way, the first terminal device and the third terminal device complete the feedback of the beam information during the beam training process.
  • the first terminal device is UE-A
  • the second terminal device is UE-B
  • the third terminal device is UE-C
  • the first beam is beam 2
  • the second beam is beam 3.
  • UE-A sends a first reference signal and a first control information to UE-B in the direction of beam 2
  • UE-B receives the first reference signal and the first control information.
  • UE-B measures the first reference signal and determines the feedback information of beam 2 according to the measurement result.
  • UE-B determines feedback resource 1 as the first target feedback resource from multiple first feedback resources, and sends the feedback information of beam 2 to UE-A on feedback resource 1.
  • UE-A After receiving the feedback information of beam 2, UE-A sends the first ACK information in the direction of beam 2 to release other feedback resources. UE-B receives the first ACK information and releases other feedback resources. UE-A sends the second reference signal and the second control information to UE-C in the direction of beam 3, and UE-C receives the second reference signal and the second control information. UE-C measures the second reference signal and generates the feedback information of beam 3 according to the measurement result. UE-C determines feedback resource 4 as the target feedback resource from the multiple second feedback resources, and sends feedback information of beam 3 to UE-A on feedback resource 4. After receiving the feedback information of beam 3, UE-A sends second ACK information in the direction of beam 3 to release other feedback resources in the multiple second feedback resources except feedback resource 4. UE-C receives the second ACK information and releases other feedback resources in the multiple second feedback resources except feedback resource 4.
  • Figure 13 shows a method for determining multiple feedback resources corresponding to different beams indicated by the control information on the PSCCH of different beam frames of the first terminal device in the case of single transmission and multiple reception, so that the second terminal device can feedback beam information on the feedback resource corresponding to the optimal beam received from the first terminal device, thereby solving the problem of feedback resource conflict.
  • the beam feedback method in the above-mentioned single-transmit multiple-receive situation is a modified method based on the beam feedback method in the single-transmit single-receive situation. That is to say, in the above-mentioned single-transmit multiple-receive scenario, the transmitting terminal device can be regarded as a transmitting terminal device in the single-transmit single-receive scenario, and the receiving terminal device can be regarded as a receiving terminal device in the single-transmit single-receive scenario.
  • an embodiment of the present application further provides a method for beam information feedback in the case of multiple transmissions and single reception.
  • the first terminal device is UE1
  • the second terminal device is UE2
  • the fourth terminal device is UE3, wherein UE1 and UE3 are transmitting terminal devices that perform beam scanning
  • UE2 is a receiving terminal device.
  • the first terminal device may send a first reference signal and a first control information to the second terminal device in the first beam direction.
  • the fourth terminal device may send a third reference signal and a third control information to the second terminal device in the third beam direction.
  • the third reference signal is used for beam training of the side link
  • the third control information indicates a plurality of third feedback resources
  • the plurality of third feedback resources are used to transmit feedback information of the third beam
  • the plurality of third feedback resources are mutually orthogonal.
  • the process of the fourth terminal device sending the third reference signal and the third control information is the same as the process shown in S901 in FIG. 9, and will not be repeated here.
  • the second terminal device After receiving the first reference signal sent by the first terminal device and the third reference signal sent by the fourth terminal device, the second terminal device measures the first reference signal and the third reference signal respectively. The second terminal device determines that the first beam is the optimal beam between the second terminal device and the first terminal device based on the measurement result of the first reference signal. The second terminal device determines that the third beam is the optimal beam between the second terminal device and the fourth terminal device based on the measurement result of the third reference signal. For example, taking Figure 14 as an example, the optimal beam of UE1 corresponding to UE2 is beam 3, and the optimal beam of UE3 corresponding to UE2 is beam 2.
  • the second terminal device After determining that the first beam and the third beam are the optimal beams, the second terminal device generates feedback information of the first beam and feedback information of the third beam.
  • the second terminal device can determine the first target feedback resource from multiple first feedback resources to transmit the feedback information of the first beam, and determine the second target feedback resource from multiple third feedback resources to transmit the feedback information of the third beam.
  • the multiple first feedback resources are mutually orthogonal in the resource pool of the first terminal device
  • the multiple third feedback resources are mutually orthogonal in the resource pool of the fourth terminal device
  • the resource positions corresponding to the multiple first feedback resources and the multiple third feedback resources may be the same. In this way, when the second terminal device feeds back the feedback information of the first beam and the feedback information of the third beam, the same feedback resource may be selected to transmit the feedback information, resulting in a feedback resource conflict and a failure of beam information feedback.
  • the second terminal device can feed back the feedback information of the beam in the following manner.
  • the second terminal device can determine at least one first candidate feedback resource from multiple first feedback resources.
  • the first candidate feedback resource is in an idle state; or the first candidate feedback resource is in an occupied state, and the receiving end of the data transmitted by occupying the first candidate feedback resource is the first terminal device.
  • the second terminal device can determine at least one second candidate feedback resource from multiple third feedback resources.
  • the second candidate feedback resource is in an idle state; or the second candidate feedback resource is in an occupied state, and the receiving end of the data transmitted by occupying the second candidate feedback resource is the fourth terminal device.
  • the above-mentioned determination process of the first candidate feedback resource and the second candidate feedback resource is the same as the process of the second terminal device determining the first target feedback resource in Figure 9, which will not be repeated here.
  • the second terminal device may determine at least one second candidate feedback resource as the second target feedback resource from at least one second candidate feedback resource.
  • the second terminal device may determine at least one first candidate feedback resource as the third target feedback resource from at least one first candidate feedback resource.
  • the third target feedback resource and the second target feedback resource are different feedback resources.
  • the first terminal device is UE1
  • the fourth terminal device is UE2
  • the second terminal device determines that the corresponding optimal UE1 transmission beam is beam 3 and the resource positions of the multiple first feedback resources corresponding to beam 3 are 1, 2, and 3.
  • the second terminal device determines that the corresponding optimal UE2 transmission beam is beam 2, and the resource positions of the multiple third feedback resources corresponding to beam 2 are 4, 5, and 6.
  • the priority judgment standard can be the priority of the data carried by the transmitting beam of the transmitting terminal device, or whether the transmitting terminal device has a candidate beam pair, or other judgment standards, which are not limited here.
  • the priority judgment standard can be the priority of the data carried by the transmitting beam of the transmitting terminal device, or whether the transmitting terminal device has a candidate beam pair, or other judgment standards, which are not limited here.
  • the second terminal device feeds back the feedback information of the beam to the transmitting terminal device.
  • the transmitting terminal device can execute the contents of step S904-1 or S904-2 shown in FIG. 9 above to release resources, which will not be described in detail here.
  • the transmitting terminal device can be the first terminal device or the fourth terminal device.
  • the second terminal device can release other feedback resources except the third target feedback resource among the multiple first feedback resources, and the third feedback resource except the second target feedback resource among the multiple third feedback resources, thereby further improving the utilization rate of system resources.

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

Abstract

Les modes de réalisation de la présente demande se rapportent au domaine technique des communications. La présente demande concerne un procédé et un appareil de communication. Le procédé de communication comprend l'étape suivante : un premier dispositif terminal envoie un premier signal de référence et des premières informations de commande à un second dispositif terminal dans une première direction de faisceau, les premières informations de commande indiquant une pluralité de premières ressources de rétroaction, et la pluralité de premières ressources de rétroaction étant utilisées pour transmettre des informations de rétroaction d'un premier faisceau. De cette manière, un second dispositif terminal peut déterminer au moins une première ressource de rétroaction parmi une pluralité de premières ressources de rétroaction pour transmettre des informations de rétroaction d'un premier faisceau, de sorte que la possibilité que les ressources de rétroaction soient dans l'incapacité de mettre en œuvre de rétroaction de faisceau en raison des problèmes tels que des conflits en semi-duplex ou d'envoi puisse être réduite, et la fiabilité de l'entraînement de faisceau peut ainsi être améliorée.
PCT/CN2024/116396 2023-09-27 2024-09-02 Procédé et appareil de communication Pending WO2025066803A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220046430A1 (en) * 2020-08-05 2022-02-10 Qualcomm Incorporated Intra-slot transmit/receive beam selection for sidelink
CN114424466A (zh) * 2019-08-16 2022-04-29 康维达无线有限责任公司 用于新无线电车辆通信的波束管理
CN114616843A (zh) * 2019-11-08 2022-06-10 高通股份有限公司 基于侧链反馈来回收资源
CN116097806A (zh) * 2020-08-21 2023-05-09 高通股份有限公司 用于释放与侧行链路通信相关的侧行链路资源的技术
CN116326002A (zh) * 2020-10-09 2023-06-23 高通股份有限公司 在未许可频谱中的侧行链路反馈信道资源映射

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114424466A (zh) * 2019-08-16 2022-04-29 康维达无线有限责任公司 用于新无线电车辆通信的波束管理
CN114616843A (zh) * 2019-11-08 2022-06-10 高通股份有限公司 基于侧链反馈来回收资源
US20220046430A1 (en) * 2020-08-05 2022-02-10 Qualcomm Incorporated Intra-slot transmit/receive beam selection for sidelink
CN116097806A (zh) * 2020-08-21 2023-05-09 高通股份有限公司 用于释放与侧行链路通信相关的侧行链路资源的技术
CN116326002A (zh) * 2020-10-09 2023-06-23 高通股份有限公司 在未许可频谱中的侧行链路反馈信道资源映射

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