A sidelink beam management method, apparatus, device, and system

Abstract

This application discloses a beam management method, apparatus, device, and system for a direct link. A first device transmits a beam scanning channel, a second device receives the beam scanning channel and measures it to obtain a beam report, which is then sent back to the first device. The first device receives the beam report from the second device and determines a target transmission beam based on it. This target transmission beam is the transmission beam used for communication between the first and second devices. Therefore, this method fully considers the characteristics of direct links and provides a beam management mechanism suitable for direct links. It ensures that when terminal devices communicate using direct links, communication in FR2 is conducted through the target transmission beam, thus improving the communication efficiency of FR2 communication in direct links.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to a beam management method, apparatus, device and system for a direct link. Background Technology

[0002] In fifth-generation broadband cellular network (fG) communication, the 5G spectrum is divided into two regions: Frequency Range (FR) 1 and FR2. FR1 ranges from 450 MHz to 6 GHz, also known as Sub-6G, while FR2 ranges from 24 GHz to 52 GHz. Since the electromagnetic wave wavelengths of FR2 are mostly in the millimeter range, FR2 is often referred to as millimeter wave (mmWave). The high-frequency FR2 band has advantages such as abundant spectrum resources and less interference, making it highly promising for applications in scenarios such as vehicular networks.

[0003] In FR2 band communication, directional beams are required for data transmission to ensure communication efficiency. Therefore, beam management is necessary to determine the transmission beam. Sidelink (SL) is one of the communication methods used between terminal devices, and implementing sidelink FR2 communication between terminal devices is an inevitable trend.

[0004] To enable FR2 communication via a direct link between terminal devices, a beam management scheme suitable for direct links is urgently needed. Summary of the Invention

[0005] This application provides a beam management method, apparatus, device, and system for a direct link. The beam management mechanism fully considers the characteristics of the direct link and can determine the target transmission beam for FR2 communication in the direct link to ensure the communication efficiency of FR2 communication in the direct link.

[0006] In a first aspect, this application provides a beam management method for a direct link, applied to a first device, the method comprising:

[0007] Transmit a beam scanning channel, the beam scanning channel being used for beam measurement;

[0008] Receive a beam report sent by a second device, the beam report being obtained by the second device through receiving and measuring the beam scanning channel;

[0009] Based on the beam report, a target transmission beam is determined, which is the transmission beam used by the first device and the second device for communication.

[0010] Optionally, the beam scanning channel includes a control channel and a reference signal, and the transmit beam scanning channel includes:

[0011] The control channel is transmitted in a first beam direction, and the reference signal is transmitted in a second beam direction, wherein the first beam direction and the second beam direction have spatial correlation.

[0012] Alternatively, the control channel may be transmitted in a first beam direction, and the reference signal may be transmitted in multiple different beam directions, wherein the first beam direction and the beam direction in which the reference signal is transmitted are spatially correlated.

[0013] The spatial correlation includes at least one of the following: having a quasi-colocation (QCL) relationship, or at least partially overlapping.

[0014] Optionally,

[0015] The reference signal includes at least one of the following: a signal dedicated to beam measurement, a Siedlink Synchronization Signal (SLSS), a Channel State Information Reference Signal (CSI-RS), or a Demodulation Reference Signal (DMRS).

[0016] The control channel includes at least one of the following: reference signal indication information, beam measurement auxiliary information, indication bits, source ID, destination ID, zone ID, application ID, service type information, and priority information. Optionally, the control channel may also include at least one of the following: modulation and coding scheme, modulation and coding scheme (MCS) table indication, hybrid automatic repeat request (HARQ) related information, format and time-frequency domain information of second-stage sidelink control information (2nd-stage SCI), and reserved bits.

[0017] Optionally,

[0018] The indicator bit is used to indicate whether the beam scanning channel carries data information;

[0019] The reference signal indication information includes at least one of the following: time-domain configuration information of the reference signal, frequency-domain configuration information of the reference signal, and the number or sequence of reference signal ports. The time-domain configuration information of the reference signal includes at least one of the following: time-domain pattern information of the reference signal, time-domain start symbol position information of the reference signal, or time-domain symbol count information of the reference signal. The frequency-domain configuration information of the reference signal includes at least one of the following: frequency-domain pattern information of the reference signal, frequency-domain start physical resource block (PRB) position information of the reference signal, frequency-domain start sub-channel position information of the reference signal, number of PRBs occupied by the reference signal in the frequency domain, number of sub-channels occupied by the reference signal in the frequency domain, or frequency-domain shift information of the reference signal.

[0020] The beam measurement auxiliary information includes at least one of the following: beam index information, beam number information, beam resource indication information, and beam report indication information, wherein the beam report indication information includes at least one of the following: time interval, delay limit, or time window information.

[0021] Optionally, the configuration information of the beam scanning channel is configured or pre-configured by a higher layer, and the configuration information includes at least one of the following: time-domain configuration information, frequency-domain configuration information, sequence identification information of the beam scanning channel reference signal, sequence type information, resource type information, or beam repetition indicator bit;

[0022] The beam repetition indicator bit is used to indicate whether the reference signal is transmitted with the same beam or with multiple different beams.

[0023] The time-domain configuration information includes at least one of the following: reference signal time-domain pattern information, control channel time-domain pattern information, reference signal time-domain start symbol position information, control channel time-domain start symbol position information, reference signal time-domain symbol count information, control channel time-domain symbol count information, or pattern information of reference signal time-domain symbol positions supported by the resource pool.

[0024] The frequency domain configuration information includes at least one of the following: reference signal frequency domain pattern information, reference signal frequency domain starting PRB position information, control channel frequency domain starting PRB position information, reference signal frequency domain starting sub-channel position information, control channel frequency domain starting sub-channel position information, number of PRBs occupied by the reference signal frequency domain, number of PRBs occupied by the control channel frequency domain, number of sub-channels occupied by the reference signal frequency domain, number of sub-channels occupied by the control channel frequency domain, or reference signal frequency domain shift information.

[0025] Optionally, the beam report includes: beam identification information, and / or, beam measurement information.

[0026] Optionally, receiving the beam report sent by the second device includes:

[0027] Using the beam direction that transmits the control channel or the reference signal, the beam report is received on the corresponding time-frequency resources;

[0028] Alternatively, the beam report may be received in beam scanning form based on beam report indication information included in the control channel of the beam scanning channel, or based on time interval information, delay limit information, or time window information configured or pre-configured by higher layers.

[0029] Optionally, determining the target transmission beam based on the beam report includes:

[0030] If only one beam report is received after transmitting the beam scanning channel, the target transmitting beam is determined according to the beam identification information indicated in the beam report, or the target transmitting beam is determined according to the time and frequency resources used by the beam report.

[0031] After transmitting the beam scanning channel, if multiple beam reports are received, the method for determining the target transmission beam includes at least one of the following: determining the target transmission beam based on the beam identification information indicated in the latest received beam report; or selecting the target transmission beam based on the reference signal measurement values ​​in the multiple beam reports.

[0032] Optionally, the method further includes:

[0033] Send beam indication information to the second device, the beam indication information including: beam identification information of the target transmitted beam, and / or, the activation time of the target transmitted beam.

[0034] Secondly, this application also provides a beam management method for a direct link, applied to a second device, the method comprising:

[0035] Receives a beam scanning channel sent by a first device, the beam scanning channel being used for beam measurement;

[0036] Beam reports are obtained by measuring the beam scanning channel;

[0037] The beam report is sent to the first device, and the beam report is used by the first device to determine the target transmission beam for communicating with the second device.

[0038] Optionally, sending the beam report to the first device includes:

[0039] The beam report is transmitted in the direction of the third beam.

[0040] Optionally, the beam scanning channel includes a control channel and a reference signal, and the method for determining the third beam direction includes at least one of the following:

[0041] When the reference signal is received in the fourth beam direction, the third beam direction is one of the following directions: a beam direction that is spatially correlated with the fifth beam direction corresponding to the beam direction of receiving the control channel, or a beam direction that is spatially correlated with the sixth beam direction corresponding to the fourth beam direction.

[0042] When the beam direction for receiving the reference signal is not unique, the third beam direction is at least one of the following directions: a beam direction that is spatially correlated with the seventh beam direction corresponding to the beam direction for receiving the control channel, and a beam direction that is spatially correlated with the eighth beam direction corresponding to the beam direction indicated in the beam report.

[0043] The spatial correlation includes at least one of the following: having a QCL relationship, or at least partially overlapping.

[0044] Optionally, the beam report is carried by: physical sidelink physical layer signaling, and / or, medium access control-control equipment (MAC-CE) in the physical sidelink shared channel (PSSCH), and / or, radio resource control (PC5-RRC) in the physical sidelink shared channel (PSSCH), wherein the physical sidelink physical layer signaling includes at least one of the following: physical sidelink feedback channel (PSFCH), physical sidelink control channel (PSCCH), or 2nd-stage SCI in the PSSCH.

[0045] Optionally, the beam report is carried by the PSFCH, and the time-frequency resources of the beam report are obtained through the time-frequency resources occupied by the control channel and / or reference signal of the beam scanning channel transmitted by the first device. Sending the beam report to the first device includes:

[0046] According to the mapping rules between the beam scanning channel and PSFCH, the beam report is sent using PSFCH on the corresponding time-frequency resources.

[0047] Optionally, the beam report is carried by PSCCH and / or PSSCH, and the time-frequency resources of the beam report are obtained by the first device transmitting the time-frequency resources occupied by the control channel and / or reference signal of the beam scanning channel, as well as the beam measurement auxiliary information of the control channel in the beam scanning channel. Sending the beam report to the first device includes:

[0048] The beam report is sent according to the beam report indication information included in the control channel of the beam scanning channel, or according to the time interval information, feedback delay information, or time window information configured or pre-configured by higher layers.

[0049] Optionally, sending the beam report to the first device includes:

[0050] When at least one candidate transmit beam in the beam report meets a preset condition, the beam report is sent. The preset condition includes that the transmission quality characterized by the measurement results of at least one candidate transmit beam in the beam report is higher than the measurement results of all candidate transmit beams in the historical beam reports.

[0051] Thirdly, this application also provides a beam management device for a direct link, applied to a first device, the device comprising:

[0052] A transmitting unit is used to transmit a beam scanning channel, which is used for beam measurement;

[0053] A receiving unit is configured to receive a beam report sent by a second device, wherein the beam report is obtained by the second device from receiving and measuring the beam scanning channel;

[0054] The determining unit is configured to determine a target transmitting beam based on the beam report, wherein the target transmitting beam is the transmitting beam used by the first device and the second device for communication.

[0055] Optionally, the beam scanning channel includes a control channel and a reference signal, and the transmitting unit is specifically used for:

[0056] The control channel is transmitted in a first beam direction, and the reference signal is transmitted in a second beam direction, wherein the first beam direction and the second beam direction have spatial correlation.

[0057] Alternatively, the control channel may be transmitted in a first beam direction, and the reference signal may be transmitted in multiple different beam directions, wherein the first beam direction and the beam direction in which the reference signal is transmitted are spatially correlated.

[0058] The spatial correlation includes at least one of the following: having a QCL relationship, or at least partially overlapping.

[0059] Optionally,

[0060] The reference signal includes at least one of the following: a signal dedicated to beam measurement, SLSS, CSI-RS, or DMRS;

[0061] The control channel includes at least one of the following: reference signal indication information, beam measurement auxiliary information, indication bits, source ID, destination ID, zone ID, application identifier, service type information, and priority information. Optionally, the control channel may also include at least one of the following: modulation and coding scheme, MCS table indication, HARQ related information, 2nd-stage SCI format and time-frequency domain information, and reserved bits.

[0062] Optionally,

[0063] The indicator bit is used to indicate whether the beam scanning channel carries data information;

[0064] The reference signal indication information includes at least one of the following: time-domain configuration information of the reference signal, frequency-domain configuration information of the reference signal, and the number or sequence of reference signal ports. The time-domain configuration information of the reference signal includes at least one of the following: time-domain pattern information of the reference signal, time-domain start symbol position information of the reference signal, or time-domain symbol count information of the reference signal. The frequency-domain configuration information of the reference signal includes at least one of the following: frequency-domain pattern information of the reference signal, frequency-domain start PRB position information of the reference signal, frequency-domain start sub-channel position information of the reference signal, number of PRBs occupied in the frequency domain of the reference signal, number of sub-channels occupied in the frequency domain of the reference signal, or frequency-domain shift information of the reference signal.

[0065] The beam measurement auxiliary information includes at least one of the following: beam index information, beam number information, beam resource indication information, and beam report indication information, wherein the beam report indication information includes at least one of the following: time interval, delay limit, or time window information.

[0066] Optionally, the configuration information of the beam scanning channel is configured or pre-configured by a higher layer, and the configuration information includes at least one of the following: time-domain configuration information, frequency-domain configuration information, sequence identification information of the beam scanning channel reference signal, sequence type information, resource type information, or beam repetition indicator bit;

[0067] The beam repetition indicator bit is used to indicate whether the reference signal is transmitted with the same beam or with multiple different beams.

[0068] The time-domain configuration information includes at least one of the following: reference signal time-domain pattern information, control channel time-domain pattern information, reference signal time-domain start symbol position information, control channel time-domain start symbol position information, reference signal time-domain symbol count information, control channel time-domain symbol count information, or pattern information of reference signal time-domain symbol positions supported by the resource pool.

[0069] The frequency domain configuration information includes at least one of the following: reference signal frequency domain pattern information, reference signal frequency domain starting PRB position information, control channel frequency domain starting PRB position information, reference signal frequency domain starting sub-channel position information, control channel frequency domain starting sub-channel position information, number of PRBs occupied by the reference signal frequency domain, number of PRBs occupied by the control channel frequency domain, number of sub-channels occupied by the reference signal frequency domain, number of sub-channels occupied by the control channel frequency domain, or reference signal frequency domain shift information.

[0070] Optionally, the beam report includes: beam identification information, and / or, beam measurement information.

[0071] Optionally, the receiving unit is specifically used for:

[0072] Using the beam direction that transmits the control channel or the reference signal, the beam report is received on the corresponding time-frequency resources;

[0073] Alternatively, the beam report may be received in beam scanning form based on beam report indication information included in the control channel of the beam scanning channel, or based on time interval information, delay limit information, or time window information configured or pre-configured by higher layers.

[0074] Optionally, the determining unit is specifically used for:

[0075] If only one beam report is received after transmitting the beam scanning channel, the target transmitting beam is determined according to the beam identification information indicated in the beam report, or the target transmitting beam is determined according to the time and frequency resources used by the beam report.

[0076] After transmitting the beam scanning channel, if multiple beam reports are received, the method for determining the target transmission beam includes at least one of the following: determining the target transmission beam based on the beam identification information indicated in the latest received beam report; or selecting the target transmission beam based on the reference signal measurement values ​​in the multiple beam reports.

[0077] Optionally, the transmitting unit is further configured to:

[0078] Send beam indication information to the second device, the beam indication information including: beam identification information of the target transmitted beam, and / or, the activation time of the target transmitted beam.

[0079] Fourthly, this application also provides a beam management device for a direct link, applied to a second device, the device comprising:

[0080] A receiving unit is configured to receive a beam scanning channel transmitted by a first device, wherein the beam scanning channel is used for beam measurement;

[0081] The measurement unit is used to measure the beam scanning channel and obtain a beam report;

[0082] A transmitting unit is configured to transmit the beam report to the first device, wherein the beam report is used by the first device to determine the target transmitting beam for communicating with the second device.

[0083] Optionally, the sending unit is specifically used for:

[0084] The beam report is transmitted in the direction of the third beam.

[0085] Optionally, the beam scanning channel includes a control channel and a reference signal, and the method for determining the third beam direction includes at least one of the following:

[0086] When the reference signal is received in the fourth beam direction, the third beam direction is one of the following directions: a beam direction that is spatially correlated with the fifth beam direction corresponding to the beam direction of receiving the control channel, or a beam direction that is spatially correlated with the sixth beam direction corresponding to the fourth beam direction.

[0087] When the beam direction for receiving the reference signal is not unique, the third beam direction is at least one of the following directions: a beam direction that is spatially correlated with the seventh beam direction corresponding to the beam direction for receiving the control channel, and a beam direction that is spatially correlated with the eighth beam direction corresponding to the beam direction indicated in the beam report.

[0088] The spatial correlation includes at least one of the following: having a QCL relationship, or at least partially overlapping.

[0089] Optionally, the beam report bearer method includes: physical pass-through physical layer signaling, and / or, MAC-CE in PSSCH, and / or, PC5-RRC, wherein the pass-through physical layer signaling includes at least one of the following: PSFCH, PSCCH or 2nd-stage SCI in PSSCH.

[0090] Optionally, the beam report is carried by the PSFCH, and the time-frequency resources of the beam report are obtained by the first device transmitting the time-frequency resources occupied by the control channel and / or reference signal of the beam scanning channel. The transmitting unit is specifically used for:

[0091] According to the mapping rules between the beam scanning channel and PSFCH, the beam report is sent using PSFCH on the corresponding time-frequency resources.

[0092] Optionally, the beam report is carried by PSCCH and / or PSSCH, and the time-frequency resources of the beam report are obtained by the first device transmitting the time-frequency resources occupied by the control channel and / or reference signal of the beam scanning channel, as well as the beam measurement auxiliary information of the control channel in the beam scanning channel. The transmitting unit is specifically used for:

[0093] The beam report is sent according to the beam report indication information included in the control channel of the beam scanning channel, or according to the time interval information, feedback delay information, or time window information configured or pre-configured by higher layers.

[0094] Optionally, the sending unit is specifically used for:

[0095] When at least one candidate transmit beam in the beam report meets a preset condition, the beam report is sent. The preset condition includes that the transmission quality characterized by the measurement results of at least one candidate transmit beam in the beam report is higher than the measurement results of all candidate transmit beams in the historical beam reports.

[0096] Fifthly, this application also provides a beam management system for a direct link, the system comprising a first device and a second device, the system being used to perform beam management on the direct link between the first device and the second device.

[0097] The first device is configured to perform the method provided in the first aspect above;

[0098] The second device is used to perform the method provided in the second aspect above.

[0099] Sixthly, this application also provides a terminal device, the terminal device including a processor and a memory:

[0100] The memory is used to store programs;

[0101] The processor is used to execute the method provided in the first or second aspect above, according to the program.

[0102] In a seventh aspect, this application also provides a storage medium for storing a program that runs on a processor and is used to perform the method provided in the first or second aspect above.

[0103] Therefore, this application has the following beneficial effects:

[0104] This application provides a beam management method for a direct link. In this method, a first device sends a beam scanning channel for beam measurement. After receiving the beam scanning channel, a second device measures the beam scanning channel to obtain a beam report and sends the beam report back to the first device. After receiving the beam report from the second device, the first device determines a target transmission beam based on the beam report. This target transmission beam is the transmission beam used for communication between the first and second devices. It is evident that this method fully considers the characteristics of direct links, such as the distributed communication characteristics and reference signal structure of direct links, and proposes a beam management mechanism suitable for direct links. This ensures that communication between terminal devices is conducted through the target transmission beam in FR2, improving the communication efficiency of FR2 communication in direct links. Attached Figure Description

[0105] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0106] Figure 1 This is a flowchart illustrating a beam management method for a through link according to an embodiment of this application;

[0107] Figure 2 This is a schematic diagram of one beam direction in an embodiment of this application;

[0108] Figure 3 This is a schematic diagram of transmitting a reference signal in the direction of the second beam in an embodiment of this application;

[0109] Figure 4 This is a schematic diagram illustrating the transmission of reference signals in different beam directions in embodiments of this application;

[0110] Figure 5 This is a schematic diagram illustrating a method for transmitting a beam report according to an embodiment of this application;

[0111] Figure 6 This is a schematic diagram of another method for transmitting beam reports in an embodiment of this application;

[0112] Figure 7 This is a schematic diagram illustrating yet another method of transmitting a beam report in an embodiment of this application;

[0113] Figure 8 This is a schematic diagram illustrating the relationship between PSFCH and beam reporting in one embodiment of this application;

[0114] Figure 9 This is a schematic diagram illustrating the relationship between PSFCH and beam reporting in another embodiment of this application;

[0115] Figure 10 This is a schematic diagram illustrating the relationship between PSFCH and beam reporting in another embodiment of this application;

[0116] Figure 11 This is a schematic diagram of the structure of an independent reference signal in an embodiment of this application;

[0117] Figure 12 This is a schematic diagram of another independent reference signal in an embodiment of this application;

[0118] Figure 13 This is a schematic diagram of the structure of another independent reference signal in the embodiments of this application;

[0119] Figure 14 This is a schematic diagram of the structure of a beam management device 1400 for a direct link in an embodiment of this application;

[0120] Figure 15 This is a schematic diagram of the structure of a beam management device 1500 for a direct link in an embodiment of this application.

[0121] Figure 16 This is a schematic diagram of the structure of a beam management system 1600 for a direct link in an embodiment of this application;

[0122] Figure 17 This is a schematic diagram of the structure of a terminal device 1700 in an embodiment of this application. Detailed Implementation

[0123] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the embodiments of this application will be further described in detail below with reference to the accompanying drawings and specific implementation methods. It should be understood that the specific embodiments described herein are merely for explaining this application and are not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure.

[0124] Considering the advantages of high-frequency bands, communication in the high-frequency range (e.g., FR2) has become a key communication technology requiring development and design. In FR2 communication, to ensure communication efficiency, data needs to be transmitted via directional beams. Therefore, determining the directional beam becomes an indispensable and crucial step in FR2 communication; this process can be called beam management. The beam management process mainly includes the following stages: initial beam pairing, beam maintenance, and recovery after beam failure. Each stage requires the basic process of beam measurement, reporting, and indication.

[0125] Currently, beam management is commonly used in communication scenarios between base stations and terminal equipment. Taking the beam management mechanism in the radio interface between New Radio (UTRAN) and the User Equipment (NR-Uu, where UTRAN refers to UMTS Terrestrial Radio Access Network and UMTS refers to Universal Mobile Telecommunications System) as an example, this paper introduces the current beam management process.

[0126] Phase 1, Initial Beam Pairing. During cell search and initial random access, the User Equipment (UE) needs to synchronize downlink with the base station and receive system messages. Downlink refers to the direction from the base station to the UE. The base station uses beam scanning technology to scan and transmit synchronization signals and system message blocks (SSBs, where PBCH stands for Physical Broadcast Channel) at fixed intervals. The UE communicating with the base station receives SSBs on its corresponding beam to obtain downlink synchronization and system messages, and transmits and receives random access messages in the same beam direction. In addition to broadcast and access information, system messages, paging, and other information can also be transmitted using beam scanning. In the initial beam pairing of NR-Uu, the base station transmits SSBs in different beam directions. The UE detects the SSBs and measures the signal quality, reporting the measurement results and beam identification information to the base station through an SSB-associated PRACH report. Among them, beam identification information can be information that can uniquely identify a beam. For example, beam identification information can be an SSB index. The base station can maintain predefined pairing rules between the SSB index and PRACH resource. The base station obtains the PRACH resource based on the SSB index in the SSB associated PRACH report and the locally maintained pairing rules.

[0127] Phase Two, Beam Maintenance. After beam pairing, the UE needs to maintain the transmission quality of the selected transmit and / or receive (Tx / Rx) beam pairs. Beam maintenance addresses beam misalignment caused by UE rotation or movement and supports beam refinement from wide to narrow beams. Beam maintenance can include beam tracking and beam refinement. A common strategy for beam tracking is to scan and measure candidate beam combinations, effectively tracking and compensating for changes in the optimal transmission beam by probing adjacent beams. Beam refinement can further configure multiple signal resources within a selected wide beam angle range for finer beam search scanning.

[0128] Phase 3: Beam Failure Recovery. In NR-Uu, beam failure detection is achieved through periodic detection of the Beam Failure Recovery Reference Signal (BFR-RS) by the UE. The BFR-RS can be, for example, CSI-RS and / or SSB. When the UE is configured with the higher-layer parameter Beam-Failure-Detection-RS-ResourceConfig, the periodic CSI-RS resource index set configured by the higher-layer signaling is the Beam Failure Detection (BFD) set. When the UE is not configured with the higher-layer parameter Beam-Failure-Detection-RS-ResourceConfig, the UE determines the BFD set as a periodic CSI-RS or synchronization signal and / or a Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block. The periodic CSI-RS or SS / PBCH block satisfies the Quality Control Level (QCL) relationship with the DMRS of the Physical Downlink Control Channel (PDCCH) being monitored by the UE. When the UE detects that the signal quality (such as Layer 1 Reference Signal Receiving Power (L1-RSRP) and / or Layer 1 Signal to Interference plus Noise Ratio (L1-SINR)) is below the threshold (Qout_LR), the Physical (PHY) layer reports a BeamFailure Instance Indication to the MAC layer. The MAC layer starts a timer (such as beamFailureDetectionTimer). Within this time window, when the number of BeamFailureInstances (BFI) is greater than or equal to the threshold (such as BFI_COUNTER>=beamFailureInstanceMaxCount), it is considered that a beam failure has occurred, triggering the BFR procedure.After triggering the BFR procedure, the UE selects a new beam and sends a BFR request (BFRQ) and the newly selected transmit beam (Tx beam) to the base station via the PRACH resource. Then, the UE listens for the BeamFailure Recovery Response (BFRR) in the specific Synchronization Signal (specific SS) configured by recoverySearchSpaceId. When the UE receives the BFRR, it considers the BFR procedure to be over.

[0129] It is evident that beam management (also known as beamforming) is currently required for communication between the base station and the UE in FR2, and the beam management mechanism of NR-Uu is relatively mature. However, for scenarios where terminal devices communicate via a direct link, beam management is also necessary to achieve communication in FR2. Direct links have characteristics such as distributed communication and reference signal structures, making existing beam management mechanisms unsuitable for direct link scenarios.

[0130] Based on this, this application provides a beam management method for a direct link. A first device sends a beam scanning channel for beam measurement. A second device receives the beam scanning channel, measures it to obtain a beam report, and sends the beam report back to the first device. The first device receives the beam report from the second device and determines the target transmission beam based on the beam report. This target transmission beam is the transmission beam used for communication between the first and second devices. It is evident that this method fully considers the characteristics of direct links and provides a beam management mechanism suitable for direct links. This ensures that when terminal devices communicate using direct links, communication in FR2 is conducted through the target transmission beam, improving the communication efficiency of FR2 communication in direct links.

[0131] It should be noted that the entity implementing the beam management method for the direct link can be the beam management device for the direct link provided in the embodiments of this application. This beam management device can be housed in a terminal device or a functional module of a terminal device. The aforementioned terminal device can be any device capable of implementing the beam management method for the direct link in the embodiments of this application; for example, the terminal device can be a smartphone, an in-vehicle terminal, etc.

[0132] It should be noted that when each terminal device needs to communicate with other terminal devices on FR2 using a direct link, the terminal device can act as the first device in this application embodiment, and the other party can act as the second device. The method provided in this application embodiment is executed to determine the target transmission beam, and then the second device communicates on FR2 using a direct link based on the target transmission beam.

[0133] It should be noted that in each stage of the beam management process (such as initial beam pairing, beam maintenance, or recovery after beam failure), whenever it is necessary to determine the target transmission beam, the basic process of beam measurement, reporting, and indication must be followed. In this embodiment, the basic process is referred to as the beam management method. The designed beam management method can be applied to each stage of beam management. The only difference is that the execution scenarios are different in different stages, and some parameters may be different for different execution scenarios, but this does not affect the steps included in the beam management method and the implementation of each step.

[0134] To facilitate understanding of the specific implementation of the beam management method for a through link provided in the embodiments of this application, the following description will be provided in conjunction with the accompanying drawings.

[0135] Figure 1 This is a schematic flowchart illustrating a beam management method for a through-link provided in an embodiment of this application. Figure 1 As shown, this method is described in the form of interaction between a first device and a second device. Specifically, the first device and the second device require communication via a pass-through link on FR2.

[0136] It should be noted that, Figure 1 The method shown can be executed before the first device and the second device establish a direct link, or after the first device and the second device establish a direct link, or simultaneously with the establishment of a direct link between the first device and the second device. This application embodiment does not specifically limit the timing of the execution of the provided method.

[0137] like Figure 1 As shown, the method may include, for example, S101 to S106:

[0138] S101, the first device transmits a beam scanning channel, which is used for beam measurement.

[0139] S102, the second device receives the beam scanning channel sent by the first device.

[0140] As an example, S101 may include a first device transmitting a beam scanning channel on resources in a resource pool, and S102 may include a second device receiving the beam scanning channel transmitted by the first device on the resource pool. The resource pool may be a dedicated resource pool for beam management, or it may be a shared resource pool that is transmitted along with data.

[0141] In some implementations, the beam scanning channel may include a control channel and a reference signal.

[0142] The reference signal may include at least one of the following: a signal dedicated to beam measurement, SLSS, CSI-RS, or DMRS. A signal dedicated to beam measurement may, for example, be a Beam Measurement Reference Signal (BMRS). The reference signal is used for beam measurement.

[0143] The information carried by the control channel may include at least one of the following: reference signal indication information, beam measurement auxiliary information, indication bit, source ID, destination ID, zone ID, application identifier, service type information, and priority information. The information carried by the control channel may also include at least one of the following: modulation and coding scheme, MCS table indication, HARQ related information, 2nd-stage SCI format and time-frequency domain information, and reserved bit.

[0144] The indicator bit carried by the control channel is used to indicate whether the beam scanning channel carries data information, in order to distinguish whether the beam scanning channel carries a reference signal for beam measurement or a beam report. The beam report is data information and needs to be carried by a channel such as PSSCH that can carry data information. Therefore, the indicator bit can also be considered to indicate whether the beam scanning channel has a channel such as PSSCH that carries data information.

[0145] The reference signal indication information carried by the control channel may include at least one of the following: time-domain configuration information of the reference signal, frequency-domain configuration information of the reference signal, and the number or sequence of reference signal ports. The time-domain configuration information of the reference signal may include at least one of the following: time-domain pattern information of the reference signal, time-domain start symbol position information of the reference signal, or time-domain symbol count information of the reference signal. The frequency-domain configuration information of the reference signal may include at least one of the following: frequency-domain pattern information of the reference signal, frequency-domain start PRB position information of the reference signal, frequency-domain start sub-channel position information of the reference signal, number of PRBs occupied in the frequency domain of the reference signal, number of sub-channels occupied in the frequency domain of the reference signal, or frequency-domain shift information of the reference signal. The frequency-domain pattern information of the reference signal may, for example, include at least one of the following: starting resource element (RE), comb size, comb offset, cyclic shift, or orthogonal cover code (OCC). The frequency domain shift information of the reference signal can include the number of PRBs offset relative to the frequency domain reference point.

[0146] The beam measurement auxiliary information carried by the control channel may include at least one of the following: beam index information, beam number information, beam resource indication information, or beam report indication information. The beam index information may be indicated by a reference signal port indicator field, or by a reference signal sequence, or by a combination of ports and sequences, or by reference signal resource information. The beam number information may include: the total number of different beam directions of the transmitted reference signal (e.g., the total number of narrow beams corresponding to the current wide beam), and the total number of different beam directions of the transmitted control channel (e.g., the total number of wide beams). The beam resource indication information refers to the indication information of the resources reserved by the first device for all transmitted beams. The beam report indication information may include at least one of the following: time interval, delay limit, or time window information. The time interval may refer to the time interval between the time domain position of the transmitted beam scanning channel and the time domain start position of the transmitted beam report.

[0147] The following explains the application of some of the information carried in the control channel. The Zone ID serves as prior location information and, in some cases, can be used to narrow the beam scanning range between devices, improving beam scanning efficiency. The application identifier and service type information indicate the application and service type currently being sent by the device. In some cases, during the beam pairing phase, before or simultaneously with unicast establishment, it can assist the peer device in determining whether it is interested in the application or service type of this device, thus allowing the peer device to choose whether to establish a beam pair link with this device, avoiding the establishment of redundant beam pairs.

[0148] In some possible implementations, the configuration information of the beam scanning channel is configured or pre-configured by a higher layer of the first device. The configuration information may include at least one of the following: (1) time-domain configuration information, (2) frequency-domain configuration information, (3) sequence identification information of the beam scanning channel reference signal, (4) sequence type information, (5) resource type information, or (6) beam repetition indicator bit.

[0149] For (1), it may include at least one of the following: reference signal time-domain pattern information, control channel time-domain pattern information, reference signal time-domain start symbol position information, control channel time-domain start symbol position information, reference signal time-domain symbol number information, or control channel time-domain symbol number information. Optionally, if non-continuous mapping of reference signals in the time domain is supported, then (1) may also include the pattern information of the time-domain symbol positions occupied by the reference signals supported by the resource pool.

[0150] For (2), it may include at least one of the following: reference signal frequency domain pattern information, reference signal frequency domain start PRB position information, control channel frequency domain start PRB position information, reference signal frequency domain start sub-channel position information, control channel frequency domain start sub-channel position information, number of PRBs occupied by the reference signal frequency domain, number of PRBs occupied by the control channel frequency domain, number of sub-channels occupied by the reference signal frequency domain, number of sub-channels occupied by the control channel frequency domain, or reference signal frequency domain shift information. The reference signal frequency domain pattern information may include, for example, at least one of the following: start RE, combsize, comb offset, cyclic shift, or OCC. The reference signal frequency domain shift information may include the number of PRBs offset relative to the frequency domain reference point.

[0151] For (5), it may include periodic, non-periodic or semi-continuous, for example, it may include: beam scanning channel period value and reference signal that can be supported in each period, time domain offset information relative to the start position of the period.

[0152] For (6), it is used to indicate whether the reference signal is transmitted with the same beam or with multiple different beams.

[0153] For example, such as Figure 2 As shown, assume the first device has 8 beam directions for transmitting beam scanning channels, namely: beam 1, beam 2, ..., beam 8. For the first device, it will... Figure 2 Each of the eight beams transmits a beam scanning channel in a beam scanning manner for each beam, and performs... Figure 1 The method shown involves the first device transmitting the beam direction of the control channel during each beam scan. Figure 2 The corresponding beam is the same. Figure 2 The beam in the image can also be understood as the beam direction.

[0154] As an example, S101 may include: transmitting the control channel in a first beam direction and the reference signal in a second beam direction on resources in the resource pool, wherein the first beam direction and the second beam direction have spatial correlation. Spatial correlation may include at least one of the following: having a QCL relationship, or at least partially overlapping, that is, the first beam direction and the second beam direction have a QCL relationship, or the first beam direction and the second beam direction at least partially overlap (e.g., the first beam direction includes the second beam direction). In S102, the second device receives the control channel in the beam scanning channel with a fifth beam direction and receives the reference signal with a fourth beam direction. The first beam direction used on the first device to transmit the control channel corresponds to... Figure 2 Taking beam direction 4 as an example, the second beam direction in this example can be found in [reference needed]. Figure 3 As shown on the left, the direction of the fifth beam can be seen in [reference needed]. Figure 3 The relationship between the fourth beam direction and the fifth beam direction of the beam 41 shown in the middle can be seen in the example below. Figure 3 As shown on the right. Figure 3 The middle beam 41 can refer to the beam direction that transmits beam reports, corresponding to the fourth or fifth beam direction.

[0155] As another example, S101 may include: transmitting the control channel in a first beam direction and transmitting the reference signal in multiple different beam directions on resources in the resource pool, wherein the first beam direction has spatial correlation with the beam direction of transmitting the reference signal, and the spatial correlation may include at least one of the following: having a QCL relationship, or at least partially overlapping, that is, the first beam direction has a QCL relationship with multiple beam directions of transmitting reference signals, or the first beam direction at least partially overlaps with multiple beam directions of transmitting reference signals. In S102, the second device receives the control channel in the beam scanning channel with the ninth beam direction and receives the reference signal with the tenth beam direction. The first beam direction used on the first device to transmit the control channel corresponds to... Figure 2 Taking beam direction 4 as an example, in this example, the multiple beam directions for transmitting the reference signal can be found in [reference needed]. Figure 4 As shown on the left, the direction of the ninth beam can be found in [reference needed]. Figure 4 Beam 41 shown on the right, Figure 4 The beam 42 on the right can refer to the beam direction that transmits beam reports, which corresponds to the direction of the tenth beam.

[0156] It should be noted that the third beam direction corresponds to the beam direction of the second device receiving the control channel and / or reference signal. Specifically, it refers to the beam direction of the second device sending beam reports. For an explanation of the third beam direction, please refer to the relevant description of the third beam direction of the second device sending beam reports in S104 below.

[0157] S103, the second device measures the beam scanning channel to obtain a beam report.

[0158] Beam reports may include at least: beam identification information, and / or beam measurement information. The beam identification information may include a beam index and / or a CSI-RS resource indicator (CRI). The beam measurement information may include at least one of the following: Reference Signal Receiving Power (RSRP), Reference Signal Receiving Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Received Signal Strength Indication (RSSI), or CSI measurement results.

[0159] The beam reporting bearer method can include: Bearer method one, physical layer signaling of physical direct link; Bearer method two, MAC-CE and / or PC5-RRC in PSSCH. Bearer method one can specifically include at least one of the following: PSFCH, PSCCH, or 2nd-stage SCI in PSSCH.

[0160] When the beam report is carried by the PSFCH in the above-mentioned bearer mode one, S103 may include, for example, obtaining the time-frequency resources of the beam report through the time-frequency resources occupied by the control channel and / or reference signal of the beam scanning channel when the first device sends the beam report, thereby sending the beam report to the first device on the corresponding time-frequency resources.

[0161] When the beam report is carried by PSCCH and / or PSSCH, S103 may include, for example, the time-frequency resources occupied when the first device transmits the control channel and / or reference signal of the beam scanning channel, and the beam measurement auxiliary information of the control channel in the beam scanning channel, to obtain the time-frequency resources of the beam report, and then transmit the beam report to the first device on the corresponding time-frequency resources.

[0162] As can be seen, the second device receives and measures the beam scanning channel to obtain a beam report, which provides a data basis for the first device to determine the target transmission beam for direct link communication with the second device.

[0163] S104, the second device sends the beam report to the first device.

[0164] S105, the first device receives the beam report sent by the second device.

[0165] As an example, S104 may include: the second device transmitting the beam report over resources in the resource pool in a third beam direction. The third beam direction can be understood as the beam direction corresponding to the beam direction in which the second device receives the reference signal or control channel in the beam scanning channel.

[0166] In one possible implementation, the determination of the third beam direction includes at least one of the following methods: Method 1: When the reference signal is received in the fourth beam direction, the third beam direction is at least one of the following directions: a beam direction spatially correlated with the fifth beam direction corresponding to the beam direction of receiving the control channel, and a beam direction spatially correlated with the sixth beam direction corresponding to the fourth beam direction; when the beam direction of receiving the reference signal is not unique, the third beam direction is at least one of the following directions: a beam direction spatially correlated with the seventh beam direction corresponding to the beam direction of receiving the control channel (i.e., the aforementioned ninth beam direction), and a beam direction spatially correlated with the eighth beam direction corresponding to the beam direction indicated in the beam report; wherein the spatial correlation includes at least one of the following: having a QCL relationship, or at least partially overlapping.

[0167] It should be noted that, in the above description, the second beam direction corresponding to the first beam direction can be interpreted in two ways: firstly, the second beam direction is the same as the first beam direction; secondly, the correspondence between beam directions is pre-configured or pre-set, and the second beam direction satisfies the correspondence between the first beam direction and the first beam direction. The explanation in the first case will be used as an example in the following text.

[0168] It should be noted that, in the above description, the second beam direction that at least partially overlaps with the first beam direction can be interpreted in two ways: firstly, the second beam direction includes (or covers) the first beam direction; secondly, the second beam direction overlaps with the first beam direction within any non-empty range. The following explanation will use the first interpretation as an example.

[0169] For example, for method one, corresponding to Figure 3 In the scenario shown in the middle, beam 4 is the beam direction in which the first device transmits the control channel or reference signal, and beam 41 is the beam direction in which the second device receives the control channel and / or reference signal. At this time, the third beam direction should be the same as beam 41 or a beam direction that includes beam 41.

[0170] For example, for method two, corresponding to Figure 4In the scenario shown on the right, beam 4 is the beam through which the first device transmits the control channel, and the four smaller beams in beam 4 are the beam directions for transmitting reference signals (which can be numbered from left to right as beam a, beam b, beam c, and beam d); beam 41 is the beam through which the second device receives the control channel, and beam 42 is the beam through which the reference signal on beam c is received. Furthermore, the beam report of the second device carries information about beam c. Therefore, the third beam direction can be the same as beam 41 or beam 42, or it can be a beam direction that includes beam 41 or beam 42.

[0171] In some possible implementations, the second device sending a beam report to the first device in S104 may follow the following rules: Rule 1: The second device sends the beam report based on the beam report indication information included in the control channel of the beam scanning channel, or based on the time interval information, feedback delay information, or time window information configured or pre-configured by higher layers; Rule 2: The second device sends the beam report using the PSFCH on the corresponding time-frequency resources according to the mapping rules between the beam scanning channel and the PSFCH.

[0172] For transmission rule one, the second device can send a beam report once after completing measurements on all beam scanning channels. Corresponding to... Figure 2 In the scenario shown, after the second device completes the measurement of the beam scanning channels in all eight directions, it executes S104.

[0173] As an example, the second device can determine the timing for transmitting beam reports based on the beam measurement auxiliary information carried by the first device in the control channel; alternatively, the second device can determine the timing for transmitting beam reports based on higher-layer configuration or pre-configuration. When the beam report indication in the control channel carries a time interval, or when the higher-layer parameters configure or pre-configure a time interval, the second device can determine the time-domain start position for transmitting beam reports based on the carried time interval information. When the control channel does not carry a beam report indication, the second device can determine whether all beam scanning channels have been measured based on the beam number information and / or beam resource indication information carried in the control channel transmitted by the first device, or based on the beam number information configured or pre-configured by higher-layer parameters, and then determine whether a beam report needs to be transmitted.

[0174] As another example, if the control channel received by the second device contains delay limits or time window information, or if the higher-layer parameters of the second device are configured or pre-configured with delay limits or time window information, then the second device can feed back the corresponding beam report under the condition that the delay limits or time window information is met. Here, the delay limit is the upper limit of the feedback time for the beam measurement results; the specific feedback time should be less than the delay limit.

[0175] In some possible implementations, to ensure the first device can effectively receive beam reports, the second device needs to repeatedly transmit the beam reports. The number of transmissions can be determined based on the beam count information carried in the control channel transmitted by the first device, or it can be determined based on the beam count information configured or pre-configured by the higher-layer parameters of the second device. After S101, the first device can switch all beams for reception to ensure effective reception of beam reports and avoid events where beam reports cannot be received due to inconsistent beam directions. For example, as... Figure 5 As shown, after the first device sends 8 beam scanning channels, the first device switches the receiving beam direction to receive beam reports accurately. After the second device measures the 8 beam scanning channels and obtains the beam reports, it repeatedly sends the beam reports. The number of retransmissions is determined based on the number of beams.

[0176] For transmission rule two, the beam report is carried by the PSFCH. At least one candidate transmission beam in the beam report is a historical transmission beam used and a transmission beam whose transmission quality meets preset conditions among the transmission beams obtained from measuring the beam scanning channel. That is, the beam report does not carry the measurement result. However, the second device locally determines the best beam pair among the measurement results of the current measurement and the measurement results of all candidate beams in the historical beam report, and carries the beam identification information of the best beam pair in the beam report and sends it to the first device. It should be noted that if the measurement result of the current measurement indicates that the transmission quality of the current beam pair is lower than the transmission quality of the best beam pair among the measurement results of a certain candidate beam in the historical beam report, then the beam report obtained from the current measurement may not be sent to the first device, or the transmitted beam report may carry the beam identification information of the beam pair with the best transmission quality indicated by the measurement results in the historical beam report.

[0177] In this transmission rule two, since the beam report is carried by the PSFCH, the beam report is transmitted on the corresponding time-frequency resources according to the one-to-one mapping rule between the beam scanning channel and the PSFCH.

[0178] As an example, when a first device transmits reference signals in multiple different beam directions, and these reference signals have the same PSCCH beam, the third beam direction of the transmitted beam report is the same as the first beam direction of the control channel in the received beam scanning channel, or the third beam direction includes the first beam direction (i.e., the third beam direction is wider than the first beam direction). Figure 6 As shown, the first device receives beam reports in the first beam direction of the corresponding control channel. Optionally, the beam report resources for different beam directions are frequency division multiplexing (FDM).

[0179] As another example, when the first device transmits a reference signal in a second beam direction, the third beam direction of the transmitted beam report is the beam direction of receiving the control channel transmitted by the first device, or includes the beam direction of receiving the control channel transmitted by the first device; or, the third beam direction corresponds to the beam direction of the second device receiving the reference signal, or includes the beam direction of the second device receiving the reference signal. Figure 7 As shown, the first device receives a beam report in the first beam direction of transmitting the control channel, or in the second beam direction of transmitting the reference signal.

[0180] It should be noted that, corresponding to the above-mentioned transmission rule two, the second device uses the PSFCH to carry the beam report. In S105, the first device can use the beam direction of transmitting the control channel or the reference signal to receive the beam report on the corresponding time-frequency resources. Here, "corresponding" in "corresponding time-frequency resources" can be understood, for example, as corresponding to the beam scanning channel or corresponding to the reference signal. In addition, the first device can receive the beam report in a beam scanning manner based on the beam report indication information included in the control channel of the beam scanning channel, or based on the time interval information, delay limit information, or time window information configured or pre-configured by higher layers. For example, corresponding to the above-mentioned transmission rule one, the first device receives the beam report in a beam scanning manner.

[0181] When beam reports are carried by the PSFCH channel, the PSFCH can carry beam reports in a multiplexed manner. Multiplexing can include at least one of the following multiplexing methods: RE multiplexing, FDM, or time-division multiplexing (TDM). For example, using TDM or TDM+FDM, the PSFCH carrying the beam report has the same period as the existing PSFCH, or a larger period than the existing PSFCH, such as M times the existing PSFCH period (M is an integer greater than or equal to 1). Figure 8 With M=4, the existing PSFCH period N is 2 symbols, and the PSFCH interval N' carrying the beam report is 8 symbols. For example, using FDM, see [reference needed]. Figure 9 As shown, the PSFCH carrying beam reports has the same period as the existing PSFCH, which is N=2 symbols. For example, a separate PSFCH time-domain resource period can be configured for beam reports, such as... Figure 10 As shown, the interval of the PSFCH carrying the beam report is 1 symbol (unrelated to the existing PSFCH period), and the existing PSFCH period N is 2 symbols.

[0182] S106, the first device determines the target transmission beam based on the beam report, which is the transmission beam used by the first device to communicate with the second device.

[0183] As an example, S106 may include: if the first device receives only one beam report after transmitting the beam scanning channel, then the target transmission beam is determined according to the beam identification information indicated in the beam report, or the target transmission beam is determined according to the time-frequency resources used by the beam report; if the first device receives multiple beam reports after transmitting the beam scanning channel, then the method of determining the target transmission beam includes at least one of the following methods: method one, determining the target transmission beam according to the beam identification information indicated in the latest received beam report; method two, selecting the target transmission beam according to the reference signal measurement values ​​in the multiple beam reports.

[0184] It should be noted that the first device maintains a correspondence between transmit beams and receive beams. After the first device determines the target transmit beam based on S106, it can determine the target receive beam corresponding to the target transmit beam based on the locally maintained correspondence. Specifically, the first device uses the target transmit beam to transmit data information to the second device on the direct link, and the first device receives the data information transmitted by the second device based on the target receive beam on the direct link.

[0185] Optionally, when the first device receives multiple beam reports, it needs to inform the second device of the information of the finally selected target beam pair through beam indication information. That is, after S106, the method may further include: the first device sending beam indication information to the second device. The information carried by the beam indication information may include at least one of the following: beam identification information of the target transmitting beam (which may also be replaced by beam identification information of the target receiving beam), and / or the activation time of the target transmitting beam.

[0186] Understandably, to facilitate reader comprehension, the following will combine... Figure 11 , 12 The structure of 13 stand-alone reference signals is introduced. Figure 11 As shown, all RSs in a time slot are transmitted with the same beam direction. The first beam direction of the transmission control channel can be the same as or wider than the second beam direction of the transmission reference signal. For example... Figure 12 As shown, RSs in a slot are transmitted in different beam directions, and the first beam direction of the transmission control channel includes at least the different beam directions of the transmitted RSs. For example... Figure 13It is a mini-slot structure, and the first beam direction of the transmission control channel can be the same as or wider than the second beam direction of its corresponding reference signal.

[0187] in, Figure 12 and Figure 13 The advantages of this structure include: it can reduce the difficulty of blind detection in the control channel. For example, taking the initial beam pairing stage as an example, the second device can solve all the reference signals based on the PSCCH by searching the resource pool once.

[0188] It should be noted that the multiplexing method for the control channel and RS can be... Figure 11-13 The TDM shown can also be TDM+FDM or FDM.

[0189] It should be noted that, Figure 11-13 The RS in the data structure can be a comb-like mapping structure. The number of time-domain symbols and / or the starting symbol position and / or the occupied time-domain symbol position pattern information of the RS in the slot can be indicated by information displayed in the control channel, or configured or pre-configured by higher-layer parameters. Alternatively, the frequency domain of the beam scanning channel can be limited to occupy the entire frequency domain bandwidth of the resource pool.

[0190] It should be noted that, for Figure 12 The first Orthogonal Frequency-Division Multiplexing (OFDM) symbol in the time domain can be used for Automatic Gain Control (AGC) processing, and the specific implementation can include at least one of the following: the first OFDM symbol is obtained by repeatedly mapping the RE on the second OFDM symbol, or the first OFDM multiplexing is mapped to a dedicated AGC-RS.

[0191] As can be seen, the method of this application embodiment, through the interaction process between the first and second devices, designs a beam management scheme suitable for direct links on FR2, supporting beam domain communication between devices on FR2. It designs a method for transmitting and receiving beam scanning channels in the beam domain, defines the transmitting beam, bearer content, bearer mode, and transmission rules for beam reports, and designs the structure and configuration information of the beam scanning channel, etc. In summary, this method fully considers the characteristics of direct links, such as the distributed communication characteristics and reference signal structure of direct links, and proposes a beam management mechanism suitable for direct links. This ensures that when direct link communication is used between terminal devices, communication is conducted through the target transmitting beam in FR2, improving the communication efficiency of FR2 communication on direct links.

[0192] It should be noted that, in the embodiments of this application, the steps performed by the first device and the steps performed by the second device can be implemented as separate embodiments. Moreover, both the first device and the second device have the functions of receiving and transmitting beam scanning channels, receiving and transmitting beam reports, and measuring beam scanning channels, and perform corresponding functions in different scenarios.

[0193] Accordingly, this application also provides a beam management device 1400 for a direct link, such as... Figure 14 As shown. The device 1400 is applied to the first device and includes:

[0194] Transmitting unit 1401 is used to transmit a beam scanning channel, the beam scanning channel being used for beam measurement;

[0195] The receiving unit 1402 is used to receive a beam report sent by the second device, wherein the beam report is obtained by the second device through receiving and measuring the beam scanning channel;

[0196] The determining unit 1403 is used to determine a target transmission beam based on the beam report, wherein the target transmission beam is the transmission beam used by the first device and the second device for communication.

[0197] Optionally, the beam scanning channel includes a control channel and a reference signal, and the transmitting unit 1401 is specifically used for:

[0198] The control channel is transmitted in a first beam direction, and the reference signal is transmitted in a second beam direction, wherein the first beam direction and the second beam direction have spatial correlation.

[0199] Alternatively, the control channel may be transmitted in a first beam direction, and the reference signal may be transmitted in multiple different beam directions, wherein the first beam direction and the beam direction in which the reference signal is transmitted are spatially correlated.

[0200] The spatial correlation includes at least one of the following: having a QCL relationship, or at least partially overlapping.

[0201] Optionally,

[0202] The reference signal includes at least one of the following: a signal dedicated to beam measurement, SLSS, CSI-RS, or DMRS;

[0203] The control channel includes at least one of the following: reference signal indication information, beam measurement auxiliary information, indication bit, source ID, destination ID, zone ID, application identifier, service type information, and priority information; the control channel may also include at least one of the following: modulation and coding scheme, MCS table indication, HARQ related information, 2nd-stage SCI format and time-frequency domain information, and reserved bits.

[0204] Optionally,

[0205] The indicator bit is used to indicate whether the beam scanning channel carries data information;

[0206] The reference signal indication information includes at least one of the following: time-domain configuration information of the reference signal, frequency-domain configuration information of the reference signal, and the number or sequence of reference signal ports. The time-domain configuration information of the reference signal includes at least one of the following: time-domain pattern information of the reference signal, time-domain start symbol position information of the reference signal, or time-domain symbol count information of the reference signal. The frequency-domain configuration information of the reference signal includes at least one of the following: frequency-domain pattern information of the reference signal, frequency-domain start PRB position information of the reference signal, frequency-domain start sub-channel position information of the reference signal, number of PRBs occupied in the frequency domain of the reference signal, number of sub-channels occupied in the frequency domain of the reference signal, or frequency-domain shift information of the reference signal.

[0207] The beam measurement auxiliary information includes at least one of the following: beam index information, beam number information, beam resource indication information, and beam report indication information, wherein the beam report indication information includes at least one of the following: time interval, delay limit, or time window information.

[0208] Optionally, the configuration information of the beam scanning channel is configured or pre-configured by a higher layer, and the configuration information includes at least one of the following: time-domain configuration information, frequency-domain configuration information, sequence identification information of the beam scanning channel reference signal, sequence type information, resource type information, or beam repetition indicator bit;

[0209] The beam repetition indicator bit is used to indicate whether the reference signal is transmitted with the same beam or with multiple different beams.

[0210] The time-domain configuration information includes at least one of the following: reference signal time-domain pattern information, control channel time-domain pattern information, reference signal time-domain start symbol position information, control channel time-domain start symbol position information, reference signal time-domain symbol count information, control channel time-domain symbol count information, or pattern information of reference signal time-domain symbol positions supported by the resource pool.

[0211] The frequency domain configuration information includes at least one of the following: reference signal frequency domain pattern information, reference signal frequency domain starting PRB position information, control channel frequency domain starting PRB position information, reference signal frequency domain starting sub-channel position information, control channel frequency domain starting sub-channel position information, number of PRBs occupied by the reference signal frequency domain, number of PRBs occupied by the control channel frequency domain, number of sub-channels occupied by the reference signal frequency domain, number of sub-channels occupied by the control channel frequency domain, or reference signal frequency domain shift information.

[0212] Optionally, the beam report includes: beam identification information, and / or, beam measurement information.

[0213] Optionally, the receiving unit 1402 is specifically used for:

[0214] Using the beam direction that transmits the control channel or the reference signal, the beam report is received on the corresponding time-frequency resources;

[0215] Alternatively, the beam report may be received in beam scanning form based on beam report indication information included in the control channel of the beam scanning channel, or based on time interval information, delay limit information, or time window information configured or pre-configured by higher layers.

[0216] Optionally, the determining unit 1403 is specifically used for:

[0217] If only one beam report is received after transmitting the beam scanning channel, the target transmitting beam is determined according to the beam identification information indicated in the beam report, or the target transmitting beam is determined according to the time and frequency resources used by the beam report.

[0218] After transmitting the beam scanning channel, if multiple beam reports are received, the method for determining the target transmission beam includes at least one of the following: determining the target transmission beam based on the beam identification information indicated in the latest received beam report; or selecting the target transmission beam based on the reference signal measurement values ​​in the multiple beam reports.

[0219] Optionally, the transmitting unit 1401 is further configured to:

[0220] Send beam indication information to the second device, the beam indication information including: beam identification information of the target transmitted beam, and / or, the activation time of the target transmitted beam.

[0221] It should be noted that the specific implementation method and technical effects achieved by the device 1400 can be found in [reference needed]. Figure 1 The relevant description of the steps performed by the first device in the method shown.

[0222] Accordingly, this application also provides a beam management device 1500 for a direct link, such as... Figure 15 As shown. The device 1500 is applied to a second device and includes:

[0223] The receiving unit 1501 is used to receive the beam scanning channel sent by the first device, wherein the beam scanning channel is used for beam measurement;

[0224] Measurement unit 1502 is used to measure the beam scanning channel to obtain a beam report;

[0225] The transmitting unit 1503 is used to transmit the beam report to the first device, the beam report being used by the first device to determine the target transmitting beam for communicating with the second device.

[0226] Optionally, the transmitting unit 1503 is specifically used for:

[0227] The beam report is transmitted in the direction of the third beam.

[0228] Optionally, the beam scanning channel includes a control channel and a reference signal, and the method for determining the third beam direction includes at least one of the following:

[0229] When the reference signal is received in the fourth beam direction, the third beam direction is one of the following directions: a beam direction that is spatially correlated with the fifth beam direction corresponding to the beam direction of receiving the control channel, or a beam direction that is spatially correlated with the sixth beam direction corresponding to the fourth beam direction.

[0230] When the beam direction for receiving the reference signal is not unique, the third beam direction is at least one of the following directions: a beam direction that is spatially correlated with the seventh beam direction corresponding to the beam direction for receiving the control channel, and a beam direction that is spatially correlated with the eighth beam direction corresponding to the beam direction indicated in the beam report.

[0231] The spatial correlation includes at least one of the following: having a QCL relationship, or at least partially overlapping.

[0232] Optionally, the beam report bearer method includes: physical pass-through physical layer signaling, and / or, MAC-CE in PSSCH, and / or, PC5-RRC, wherein the pass-through physical layer signaling includes at least one of the following: PSFCH, PSCCH or 2nd-stage SCI in PSSCH.

[0233] Optionally, the beam report is carried by the PSFCH, and the time-frequency resources of the beam report are obtained by the first device transmitting the time-frequency resources occupied by the control channel and / or reference signal of the beam scanning channel. The transmitting unit 1503 is specifically used for:

[0234] According to the mapping rules between the beam scanning channel and PSFCH, the beam report is sent using PSFCH on the corresponding time-frequency resources.

[0235] Optionally, the beam report is carried by PSCCH and / or PSSCH, and the time-frequency resources of the beam report are obtained by the first device transmitting the time-frequency resources occupied by the control channel and / or reference signal of the beam scanning channel, as well as the beam measurement auxiliary information of the control channel in the beam scanning channel. The transmitting unit 1503 is specifically used for:

[0236] The beam report is sent according to the beam report indication information included in the control channel of the beam scanning channel, or according to the time interval information, feedback delay information, or time window information configured or pre-configured by higher layers.

[0237] Optionally, the transmitting unit 1503 is specifically used for:

[0238] When at least one candidate transmit beam in the beam report meets a preset condition, the beam report is sent. The preset condition includes that the transmission quality characterized by the measurement results of at least one candidate transmit beam in the beam report is higher than the measurement results of all candidate transmit beams in the historical beam reports.

[0239] It should be noted that the specific implementation method and technical effects achieved by the device 1500 can be found in [reference needed]. Figure 1 The relevant description of the steps performed by the second device in the method shown.

[0240] Furthermore, this application also provides a beam management system 1600 for a direct link, see [link to relevant documentation]. Figure 16 As shown. The system 1600 includes a first device 1601 and a second device 1602. The system 600 is used to perform beam management on the direct link between the first device 1601 and the second device 1602.

[0241] The first device 1601 is used to perform Figure 1 The steps performed by the first device in the middle;

[0242] The second device 1602 is used for Figure 1 The steps performed by the second device.

[0243] Furthermore, this application also provides a terminal device 1700, such as... Figure 17 As shown, the terminal device 1700 includes a processor 1701 and a memory 1702:

[0244] The memory 1702 is used to store programs;

[0245] The processor 1701 is used to execute according to the program. Figure 1 The methods provided.

[0246] Furthermore, this application embodiment also provides a storage medium for storing a program that runs on a processor and is used to execute the method provided in this application embodiment.

[0247] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0248] As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that all or part of the steps in the methods of the above embodiments can be implemented by means of software plus a general-purpose hardware platform. Based on this understanding, the technical solution of this application can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as a read-only memory (ROM) / RAM, magnetic disk, optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, a server, or a network communication device such as a router) to execute the methods described in various embodiments or some parts of the embodiments of this application.

[0249] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system and device embodiments are basically similar to the method embodiments, so the descriptions are relatively simple; relevant parts can be referred to the descriptions in the method embodiments. The device and system embodiments described above are merely illustrative. Modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physical modules; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0250] The above description is merely a preferred embodiment of this application and is not intended to limit the scope of protection of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A beam management method for a direct link, characterized in that, Applied to a first device, the method includes: Transmit a beam scanning channel, the beam scanning channel being used for beam measurement; Receive a beam report sent by a second device, the beam report being obtained by the second device through receiving and measuring the beam scanning channel; Based on the beam report, the target transmission beam is determined, and the target transmission beam is the transmission beam used by the first device and the second device for communication. The beam scanning channel includes a control channel and a reference signal, and the transmit beam scanning channel includes: The control channel is transmitted in a first beam direction, and the reference signal is transmitted in a second beam direction, wherein the first beam direction and the second beam direction have spatial correlation. Alternatively, the control channel may be transmitted in a first beam direction, and the reference signal may be transmitted in multiple different beam directions, wherein the first beam direction and the beam direction in which the reference signal is transmitted are spatially correlated. The spatial correlation includes at least one of the following: having a quasi-co-located QCL relationship, or at least partially overlapping; The beam report is carried by: physical direct link physical layer signaling, and / or, media access control layer control unit MAC-CE in physical direct link shared channel PSSCH, and / or, direct link radio resource control PC5-RRC, wherein the direct link physical layer signaling includes at least one of the following: physical direct link feedback channel PSFCH, physical direct link control channel PSCCH, or 2nd-stage SCI in PSSCH; The receiving of the beam report sent by the second device includes: Using the beam direction that transmits the control channel or the reference signal, the beam report is received on the corresponding time-frequency resources; Alternatively, the beam report may be received in beam scanning form based on beam report indication information included in the control channel of the beam scanning channel, or based on time interval information, delay limit information, or time window information configured or pre-configured by higher layers.

2. The method according to claim 1, characterized in that, The reference signal includes at least one of the following: a signal dedicated to beam measurement, a direct link synchronization signal (SLSS), a channel state information reference signal (CSI-RS), or a demodulation reference signal (DMRS); The control channel includes at least one of the following: reference signal indication information, beam measurement auxiliary information, indication bit, source ID, destination ID, application ID, service type information, zone ID, and priority information.

3. The method according to claim 2, characterized in that, The indicator bit is used to indicate whether the beam scanning channel carries data information; The reference signal indication information includes at least one of the following: time-domain configuration information of the reference signal, frequency-domain configuration information of the reference signal, and the number or sequence of reference signal ports. The time-domain configuration information of the reference signal includes at least one of the following: time-domain pattern information of the reference signal, time-domain start symbol position information of the reference signal, or time-domain symbol count information of the reference signal. The frequency-domain configuration information of the reference signal includes at least one of the following: frequency-domain pattern information of the reference signal, frequency-domain start physical resource block (PRB) position information of the reference signal, frequency-domain start sub-channel position information of the reference signal, number of PRBs occupied in the frequency domain of the reference signal, number of sub-channels occupied in the frequency domain of the reference signal, or frequency-domain shift information of the reference signal. The beam measurement auxiliary information includes at least one of the following: beam index information, beam number information, beam resource indication information, or beam report indication information, wherein the beam report indication information includes at least one of the following: time interval, delay limit, or time window information.

4. The method according to claim 1, characterized in that, The configuration information of the beam scanning channel is configured or pre-configured by a higher layer, and the configuration information includes at least one of the following: time domain configuration information, frequency domain configuration information, sequence identification information of the beam scanning channel reference signal, sequence type information, resource type information, or beam repetition indicator bit; The beam repetition indicator bit is used to indicate whether the reference signal is transmitted with the same beam or with multiple different beams.

5. The method according to claim 1, characterized in that, The beam report includes: beam identification information, and / or, beam measurement information.

6. The method according to claim 1, characterized in that, Determining the target transmission beam based on the beam report includes: If only one beam report is received after transmitting the beam scanning channel, the target transmitting beam is determined according to the beam identification information indicated in the beam report, or the target transmitting beam is determined according to the time-frequency resources used in the beam report. After transmitting the beam scanning channel, if multiple beam reports are received, the method for determining the target transmission beam includes at least one of the following: determining the target transmission beam based on the beam identification information indicated in the latest received beam report; or selecting the target transmission beam based on reference signal measurements in the multiple beam reports.

7. The method according to any one of claims 1-6, characterized in that, The method further includes: Send beam indication information to the second device, the beam indication information including: beam identification information of the target transmitted beam, and / or, the activation time of the target transmitted beam.

8. A beam management method for a direct link, characterized in that, Applied to a second device, the method includes: Receives a beam scanning channel sent by a first device, the beam scanning channel being used for beam measurement; Beam reports are obtained by measuring the beam scanning channel; The beam report is sent to the first device, and the beam report is used by the first device to determine the target transmission beam used to communicate with the second device; Sending the beam report to the first device includes: The beam report is transmitted in the direction of the third beam; The beam scanning channel includes a control channel and a reference signal, and the method for determining the direction of the third beam includes at least one of the following: When the reference signal is received in the fourth beam direction, the third beam direction is one of the following directions: a beam direction that is spatially correlated with the fifth beam direction corresponding to the beam direction of receiving the control channel, or a beam direction that is spatially correlated with the sixth beam direction corresponding to the fourth beam direction. When the beam direction for receiving the reference signal is not unique, the third beam direction is at least one of the following directions: a beam direction that is spatially correlated with the seventh beam direction corresponding to the beam direction for receiving the control channel, and a beam direction that is spatially correlated with the eighth beam direction corresponding to the beam direction indicated in the beam report. The spatial correlation includes at least one of the following: having a quasi-co-located QCL relationship, or at least partially overlapping; The beam report is carried by: physical direct link physical layer signaling, and / or, media access control layer control unit MAC-CE in physical direct link shared channel PSSCH, and / or, direct link radio resource control PC5-RRC, wherein the direct link physical layer signaling includes at least one of the following: physical direct link feedback channel PSFCH, physical direct link control channel PSCCH, or 2nd-stage SCI in PSSCH; If the beam report is carried by the PSFCH, and the time-frequency resources of the beam report are obtained through the time-frequency resources occupied by the control channel and / or reference signal of the beam scanning channel transmitted by the first device, the step of sending the beam report to the first device includes: According to the mapping rules between the beam scanning channel and PSFCH, the beam report is sent to the first device using PSFCH on the corresponding time-frequency resources; If the beam report is carried by PSCCH and / or PSSCH, and the time-frequency resources of the beam report are obtained by the first device transmitting the time-frequency resources occupied by the control channel and / or reference signal of the beam scanning channel, and the beam measurement auxiliary information of the control channel in the beam scanning channel, then transmitting the beam report to the first device includes: The beam report is sent according to the beam report indication information included in the control channel of the beam scanning channel, or according to the time interval information, delay information or time window information configured or pre-configured by higher layers.

9. The method according to claim 8, characterized in that, Sending the beam report to the first device includes: When at least one candidate transmit beam in the beam report meets a preset condition, the beam report is sent. The preset condition includes that the transmission quality characterized by the measurement results of at least one candidate transmit beam in the beam report is higher than the measurement results of all candidate transmit beams in the historical beam reports.

10. A beam management device for a direct link, characterized in that, Applied to a first device, the device includes: A transmitting unit is used to transmit a beam scanning channel, the beam scanning channel being used for beam measurement; the beam scanning channel includes a control channel and a reference signal, and the transmitted beam scanning channel includes: The control channel is transmitted in a first beam direction, and the reference signal is transmitted in a second beam direction, wherein the first beam direction and the second beam direction have spatial correlation; or, the control channel is transmitted in a first beam direction, and the reference signal is transmitted in multiple different beam directions, wherein the first beam direction and the beam direction in which the reference signal is transmitted have spatial correlation; wherein the spatial correlation includes at least one of the following: having a quasi-co-located QCL relationship, or at least partially overlapping; A receiving unit is configured to receive a beam report sent by a second device, wherein the beam report is obtained by the second device through receiving and measuring the beam scanning channel; The determining unit is configured to determine a target transmitting beam based on the beam report, wherein the target transmitting beam is the transmitting beam used by the first device to communicate with the second device; The beam report bearer includes: physical pass-through physical layer signaling, and / or, MAC-CE and / or PC5-RRC in PSSCH, wherein the physical pass-through physical layer signaling includes at least one of the following: 2nd-stage SCI in PSFCH, PSCCH or PSSCH. The beam report received by the second device is received using the beam direction that transmits the control channel or the reference signal on the corresponding time-frequency resources; Alternatively, it may be received in beam scanning form based on beam reporting indication information included in the control channel of the beam scanning channel, or based on time interval information, delay limit information, or time window information configured or pre-configured by higher layers.

11. A beam management device for a direct link, characterized in that, Applied to a second device, the device includes: A receiving unit is configured to receive a beam scanning channel transmitted by a first device, wherein the beam scanning channel is used for beam measurement; The measurement unit is used to measure the beam scanning channel and obtain a beam report; A transmitting unit is configured to transmit the beam report to the first device, the beam report being used by the first device to determine a target transmitting beam for communication with the second device; transmitting the beam report to the first device includes: transmitting the beam report in a third beam direction; wherein the beam scanning channel includes a control channel and a reference signal, and the method for determining the third beam direction includes at least one of the following: when the reference signal is received in a fourth beam direction, the third beam direction is one of the following directions: a beam direction spatially correlated with a fifth beam direction corresponding to the beam direction receiving the control channel, and a beam direction spatially correlated with a sixth beam direction corresponding to the fourth beam direction; when the beam direction receiving the reference signal is not unique, the third beam direction is at least one of the following directions: a beam direction spatially correlated with a seventh beam direction corresponding to the beam direction receiving the control channel, and a beam direction spatially correlated with an eighth beam direction corresponding to the beam direction indicated in the beam report; wherein the spatial correlation includes at least one of the following: having a quasi-co-located QCL relationship, or, at least partially overlapping; The beam report is carried by: physical direct link physical layer signaling, and / or, media access control layer control unit MAC-CE in physical direct link shared channel PSSCH, and / or, direct link radio resource control PC5-RRC, wherein the direct link physical layer signaling includes at least one of the following: physical direct link feedback channel PSFCH, physical direct link control channel PSCCH, or 2nd-stage SCI in PSSCH; If the beam report is carried by PSFCH, the time-frequency resources of the beam report are obtained by the first device through the time-frequency resources occupied by the control channel and / or reference signal of the beam scanning channel. The sending of the beam report to the first device is carried out using PSFCH on the corresponding time-frequency resources according to the mapping rules between the beam scanning channel and PSFCH. If the beam report is carried by PSCCH and / or PSSCH, the time-frequency resources of the beam report are obtained by the first device transmitting the time-frequency resources occupied by the control channel and / or reference signal of the beam scanning channel, and the beam measurement auxiliary information of the control channel in the beam scanning channel. The transmission of the beam report to the first device is based on the beam report indication information included in the control channel of the beam scanning channel, or based on the time interval information, delay information or time window information configured or pre-configured by higher layers.

12. A beam management system for a direct link, characterized in that, The system includes a first device and a second device, and the system is used for beam management of the direct link between the first device and the second device. The first device is configured to perform the method according to any one of claims 1-7; The second device is used to perform the method according to any one of claims 8-9.

13. A terminal device, characterized in that, The terminal device includes a processor and a memory: The memory is used to store programs; The processor is configured to execute the method according to any one of claims 1-9 according to the program.

14. A storage medium, characterized in that, The storage medium is used to store a program that runs on a processor and is used to perform the method according to any one of claims 1-9.

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