Beam management method, device, equipment and system for straight-through link

Abstract

Disclosed are a beam management method, apparatus, device and system for a straight-through link, a first device sending a beam scanning channel, a second device receiving the beam scanning channel and measuring the beam scanning channel to obtain a beam report, and sending the beam report to the first device, the first device receiving the beam report sent by the second device, and sending the beam report to the second device. And determining a target sending beam based on the beam report, wherein the target sending beam is a sending beam used for communication between the first device and the second device. Visibly, in the method, the characteristics of the straight-through link are fully considered, a beam management mechanism suitable for the straight-through link is provided, it can be ensured that communication is carried out through the target sending beam in the FR2 when the terminal equipment adopts the straight-through link for communication, and the communication efficiency of FR2 communication of the straight-through link is improved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a beam management method, device, equipment and system for a direct link. Background Art

[0002] In the fifth-generation technology standard for broadband cellular networks, 5G spectrum is divided into two areas: Frequency Range (FR) 1 and FR2. The frequency range of FR1 is 450 MHz to 6 GHz, also called Sub-6G, and the frequency range of FR2 is 24 GHz to 52 GHz. Most of the electromagnetic wave wavelengths of FR2 are at the millimeter level, so FR2 is also often called millimeter wave (mmWave). The high-frequency band FR2 has the advantages of rich spectrum resources and less interference, so it has great application potential in scenarios such as vehicle networks.

[0003] When communicating in the FR2 band, in order to ensure communication efficiency, data transmission needs to be carried out through directional beams. Therefore, beam management is required to determine the transmission beam. Sidelink (SL) is one of the communication methods used between terminal devices. It is an inevitable trend to realize FR2 communication with sidelink between terminal devices.

[0004] In order to realize FR2 communication of direct links between terminal devices, it is urgently necessary to provide a beam management solution suitable for direct links. Summary of the invention

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

[0006] In a first aspect, the present application provides a beam management method for a through link, which is applied to a first device, and the method includes:

[0007] sending a beam scanning channel, wherein the beam scanning channel is used for beam measurement;

[0008] receiving a beam report sent by a second device, where the beam report is obtained by the second device receiving and measuring the beam scanning channel;

[0009] Based on the beam report, a target transmit beam is determined, where the target transmit beam is the transmit beam used by the first device to communicate with the second device.

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

[0011] Sending the control channel in a first beam direction, and sending the reference signal in a second beam direction, wherein the first beam direction and the second beam direction have spatial correlation;

[0012] Alternatively, the control channel is sent in a first beam direction, and the reference signal is sent in multiple different beam directions, and the first beam direction has a spatial correlation with the beam direction for sending the reference signal;

[0013] The spatial correlation includes at least one of the following: having a quasi co-location (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 through link synchronization signal (Siedlink Synchronization Signal, SLSS), a channel state information reference signal (Channel State Information Reference Signals, CSI-RS) or a demodulation reference signal (Demodulation Reference Signal, DMRS);

[0016] The control channel includes at least one of the following: reference signal indication information, beam measurement auxiliary information, indicator bit, 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 mode, modulation and coding scheme (MCS) table indication, hybrid automatic repeat request (HARQ) related information, second stage sidelink control information (2nd-stage SCI) format and time-frequency domain information, and reserved bits.

[0017] Optionally,

[0018] The indication 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 contents: 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, wherein the time domain configuration information of the reference signal includes at least one of the following contents: reference signal time domain pattern information, reference signal time domain starting symbol position information, or reference signal time domain symbol number information, and the frequency domain configuration information of the reference signal includes at least one of the following contents: reference signal frequency domain pattern information, reference signal frequency domain starting physical resource block (Physical Resource Block, PRB) position information, reference signal frequency domain starting subchannel position information, reference signal frequency domain occupied PRB number, reference signal frequency domain occupied subchannel number information, or reference signal frequency domain shift information;

[0020] The beam measurement auxiliary information includes at least one of the following contents: 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 contents: 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 high layer, and the configuration information includes at least one of the following: time domain configuration information, frequency domain configuration information, sequence identification information of a beam scanning channel reference signal, sequence type information, resource type information, or a beam repetition indication bit;

[0022] The beam repetition indication bit is used to indicate whether the reference signal is sent in the same beam or in 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 starting symbol position information, control channel time domain starting symbol position information, reference signal time domain symbol number information, control channel time domain symbol number information or pattern information of reference signal occupied time domain symbol position supported by resource pool

[0024] The frequency domain configuration information includes at least one of the following contents: 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 subchannel position information, control channel frequency domain starting subchannel position information, the number of PRBs occupied by the reference signal frequency domain, the number of PRBs occupied by the control channel frequency domain, the number of subchannels occupied by the reference signal frequency domain, the number of subchannels 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 value information.

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

[0027] Receiving the beam report on a corresponding time-frequency resource using a beam direction for sending the control channel or the reference signal;

[0028] Alternatively, the beam report is received in the form of beam scanning according to the beam report indication information included in the control channel of the beam scanning channel, or according to high-level configured or pre-configured time interval information or delay limit information or time window information.

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

[0030] When only one beam report is received after the beam scanning channel is transmitted, 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;

[0031] When a plurality of beam reports are received after the beam is transmitted to scan the channel, the method for determining the target transmitting beam includes at least one of the following methods: determining the target transmitting beam based on the beam identification information indicated in the latest received beam report; or selecting the target transmitting beam based on the reference signal measurement values ​​in the plurality of beam reports.

[0032] Optionally, the method further comprises:

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

[0034] In a second aspect, the present application also provides a beam management method for a through link, which is applied to a second device, and the method includes:

[0035] receiving a beam scanning channel sent by a first device, where the beam scanning channel is used for beam measurement;

[0036] Measuring the beam scanning channel to obtain a beam report;

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

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

[0039] The beam report is sent in a third beam direction.

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

[0041] When the reference signal is received in a fourth beam direction, the third beam direction is one of the following directions: a beam direction having spatial correlation with a fifth beam direction corresponding to a beam direction for receiving the control channel, and a beam direction having spatial correlation with a 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 having spatial correlation with a seventh beam direction corresponding to a beam direction for receiving the control channel, and a beam direction having spatial correlation with an eighth beam direction corresponding to a beam direction indicated in receiving 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 carrying method of the beam report includes: physical layer signaling of a physical direct link, and / or a medium access control layer control unit (MAC-CE) in a physical sidelink shared channel (PSSCH), and / or a PC5-Radio Resource Control (PC5-RRC), wherein the physical layer signaling of the direct link includes at least one of the following contents: a physical sidelink feedback channel (PSFCH), a physical sidelink control channel (PSCCH) or a 2nd-stage SCI in a PSSCH.

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

[0046] According to the mapping rule 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 the time-frequency resources occupied by the control channel and / or reference signal of the beam scanning channel sent by the first device, and the beam measurement auxiliary information of the control channel in the beam scanning channel. The sending of 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 high-level configuration or pre-configured time interval information or feedback delay information or time window information.

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

[0050] The beam report is sent when at least one candidate transmit beam in the beam report meets a preset condition, wherein the preset condition includes: a transmission quality represented by a measurement result of at least one candidate transmit beam in the beam report is higher than the measurement results of all candidate transmit beams in a historical beam report.

[0051] In a third aspect, the present application further provides a beam management device for a direct link, which is applied to a first device, and the device includes:

[0052] A sending unit, used for sending a beam scanning channel, where the beam scanning channel is used for beam measurement;

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

[0054] A determination unit is used to determine a target transmission beam based on the beam report, where the target transmission beam is a transmission beam used by the first device to communicate with the second device.

[0055] Optionally, the beam scanning channel includes a control channel and a reference signal, and the sending unit is specifically configured to:

[0056] Sending the control channel in a first beam direction, and sending the reference signal in a second beam direction, wherein the first beam direction and the second beam direction have spatial correlation;

[0057] Alternatively, the control channel is sent in a first beam direction, and the reference signal is sent in multiple different beam directions, and the first beam direction has a spatial correlation with the beam direction for sending the reference signal;

[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, indicator bit, 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 mode, MCS table indication, HARQ related information, 2nd-stage SCI format and time-frequency domain information, and reserved bits.

[0062] Optionally,

[0063] The indication 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 contents: 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, wherein the time domain configuration information of the reference signal includes at least one of the following contents: time domain pattern information of the reference signal, time domain starting symbol position information of the reference signal, or time domain symbol number information of the reference signal, and the frequency domain configuration information of the reference signal includes at least one of the following contents: frequency domain pattern information of the reference signal, frequency domain starting PRB position information of the reference signal, frequency domain starting subchannel position information of the reference signal, number of PRBs occupied by the reference signal frequency domain, number of subchannels occupied by the reference signal frequency domain, or frequency domain shift information of the reference signal;

[0065] The beam measurement auxiliary information includes at least one of the following contents: 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 contents: 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 high layer, and the configuration information includes at least one of the following: time domain configuration information, frequency domain configuration information, sequence identification information of a beam scanning channel reference signal, sequence type information, resource type information, or a beam repetition indication bit;

[0067] The beam repetition indication bit is used to indicate whether the reference signal is sent in the same beam or in 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 starting symbol position information, control channel time domain starting symbol position information, reference signal time domain symbol number information, control channel time domain symbol number information or pattern information of reference signal occupied time domain symbol position supported by resource pool

[0069] The frequency domain configuration information includes at least one of the following contents: 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 subchannel position information, control channel frequency domain starting subchannel position information, the number of PRBs occupied by the reference signal frequency domain, the number of PRBs occupied by the control channel frequency domain, the number of subchannels occupied by the reference signal frequency domain, the number of subchannels 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 value information.

[0071] Optionally, the receiving unit is specifically configured to:

[0072] Receiving the beam report on a corresponding time-frequency resource using a beam direction for sending the control channel or the reference signal;

[0073] Alternatively, the beam report is received in the form of beam scanning according to the beam report indication information included in the control channel of the beam scanning channel, or according to high-level configured or pre-configured time interval information or delay limit information or time window information.

[0074] Optionally, the determining unit is specifically configured to:

[0075] When only one beam report is received after the beam scanning channel is transmitted, 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;

[0076] When a plurality of beam reports are received after the beam is transmitted to scan the channel, the method for determining the target transmitting beam includes at least one of the following methods: determining the target transmitting beam based on the beam identification information indicated in the latest received beam report; or selecting the target transmitting beam based on the reference signal measurement values ​​in the plurality of beam reports.

[0077] Optionally, the sending unit is further used to:

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

[0079] In a fourth aspect, the present application further provides a beam management device for a direct link, which is applied to a second device, and the device includes:

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

[0081] A measuring unit, configured to measure the beam scanning channel to obtain a beam report;

[0082] A sending unit is used to send the beam report to the first device, and the beam report is used by the first device to determine a target transmission beam for communicating with the second device.

[0083] Optionally, the sending unit is specifically configured to:

[0084] The beam report is sent in a third beam direction.

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

[0086] When the reference signal is received in a fourth beam direction, the third beam direction is one of the following directions: a beam direction having spatial correlation with a fifth beam direction corresponding to a beam direction for receiving the control channel, and a beam direction having spatial correlation with a 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 having spatial correlation with a seventh beam direction corresponding to a beam direction for receiving the control channel, and a beam direction having spatial correlation with an eighth beam direction corresponding to a beam direction indicated in receiving 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 carrying method of the beam report includes: physical layer signaling of a physical direct link, and / or MAC-CE in PSSCH, and / or PC5-RRC, wherein the physical layer signaling of the direct link includes at least one of the following: 2nd-stage SCI in PSFCH, PSCCH or PSSCH.

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

[0091] According to the mapping rule 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 sending the control channel and / or reference signal of the beam scanning channel by the first device, and the beam measurement auxiliary information of the control channel in the beam scanning channel. The sending unit is specifically used to:

[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 high-level configuration or pre-configured time interval information or feedback delay information or time window information.

[0094] Optionally, the sending unit is specifically configured to:

[0095] The beam report is sent when at least one candidate transmit beam in the beam report meets a preset condition, wherein the preset condition includes: a transmission quality represented by a measurement result of at least one candidate transmit beam in the beam report is higher than the measurement results of all candidate transmit beams in a historical beam report.

[0096] In a fifth aspect, the present application further provides a beam management system for a direct link, the system comprising a first device and a second device, the system being configured to perform beam management on a direct link between the first device and the second device,

[0097] The first device is used to execute the method provided in the first aspect above;

[0098] The second device is used to execute the method provided by the second aspect above.

[0099] In a sixth aspect, the present application further provides a terminal device, the terminal device comprising a processor and a memory:

[0100] The memory is used to store programs;

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

[0102] In a seventh aspect, the present application further provides a storage medium, wherein the storage medium is used to store a program, wherein the program runs on a processor to execute the method provided in the first aspect or the second aspect above.

[0103] It can be seen that this application has the following beneficial effects:

[0104] The present application provides a beam management method for a direct link, in which the first device sends a beam scanning channel for beam measurement, and after receiving the beam scanning channel, the second device measures the beam scanning channel to obtain a beam report, and sends the beam report to the first device, and after receiving the beam report sent by the second device, the first device determines a target transmission beam based on the beam report, and the target transmission beam is the transmission beam used for communication between the first device and the second device. It can be seen that the method fully considers the characteristics of the direct link, such as the distributed communication characteristics and reference signal structure of the direct link, and proposes a beam management mechanism suitable for the direct link, which can ensure that when communicating between terminal devices, communication is carried out through the target transmission beam in FR2, thereby improving the communication efficiency of FR2 communication of the direct link. BRIEF DESCRIPTION OF THE DRAWINGS

[0105] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0106] Figure 1 A schematic diagram of a flow chart of a beam management method for a direct link in an embodiment of the present application;

[0107] Figure 2 A schematic diagram of a beam direction in an embodiment of the present application;

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

[0109] Figure 4 A schematic diagram of sending reference signals in different beam directions in an embodiment of the present application;

[0110] Figure 5 This is a schematic diagram of sending a beam report in an embodiment of the present application;

[0111] Figure 6 This is a schematic diagram of another method of sending a beam report in an embodiment of the present application;

[0112] Figure 7 This is a schematic diagram of another method of sending a beam report in an embodiment of the present application;

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

[0114] Fig. 9 This is another schematic diagram of the relationship between PSFCH and beam reporting in an embodiment of the present application;

[0115] Fig.10 This is another schematic diagram of the relationship between PSFCH and beam reporting in an embodiment of the present application;

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

[0117] Fig.12 This is a schematic diagram of the structure of another independent reference signal in an embodiment of the present application;

[0118] Fig.13 This is a schematic diagram of the structure of another independent reference signal in an embodiment of the present application;

[0119] Fig.14 It is a structural schematic diagram of a beam management device 1400 for a direct link in an embodiment of the present application;

[0120] Fig.15 Schematic diagram of a beam management device 1500 for a direct link in an embodiment of the present application

[0121] Fig.16 It is a structural diagram of a beam management system 1600 of a direct link in an embodiment of the present application;

[0122] Fig.17 This is a schematic diagram of the structure of a terminal device 1700 in an embodiment of the present application. DETAILED DESCRIPTION

[0123] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the embodiments of the present application are further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. In addition, it should be noted that, for ease of description, only the parts related to the present application are shown in the accompanying drawings, not all structures.

[0124] Considering the advantages of high frequency bands, communication in high frequency bands (such as FR2) has become a communication technology that needs to be developed and designed. When communicating in FR2, in order to ensure communication efficiency, data needs to be transmitted through directional beams. Then, the process of determining the directional beam becomes an important link that cannot be avoided in communication in FR2. The process of determining the directional beam can be called beam management. The process of beam management can mainly include the following stages: initial beam pairing, beam maintenance, and recovery after beam failure. Each stage needs to go through the basic process of beam measurement, reporting, and indication.

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

[0126] Phase 1, initial beam pairing. During the cell search and initial random access process, the user equipment (UE) needs to synchronize downlink with the base station and receive system messages, where downlink refers to the direction from the base station to the UE. The base station uses beam scanning technology to scan and send synchronization signals and system message blocks (Synchronization Signal and PBCH Block, SSB, where PBCH refers to the Physical Broadcast Channel) at a fixed period. The UE communicating with the base station receives the SSB on its corresponding beam to obtain downlink synchronization and system messages, and performs random access to send and receive each message in the same beam direction. In addition to broadcast and access information, system messages, paging and other information can also be sent using beam scanning. In the initial beam pairing in NR-Uu, the base station transmits the SSB in different beam directions, the UE detects the SSB and measures the signal quality, and reports the measurement results and beam identification information to the base station through the SSB associated PRACH report. Among them, the beam identification information may be information that can uniquely identify the beam, for example, the beam identification information may be an SSB index (SSB index), and the base station may maintain a predefined pairing rule between the SSB index and the PRACH resource (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 rule.

[0127] Phase 2, beam maintenance. After beam pairing, the UE needs to maintain the transmission quality of the selected transmit and / or receive (Tx / Rx) beam pair. Beam maintenance is used to solve beam misalignment problems caused by UE rotation or movement, and supports the beam refinement process from wide beam to narrow beam. Beam maintenance can include beam tracking and beam refinement, where the common strategy of beam tracking is to scan, search and measure candidate beam combinations, and effectively track and compensate for changes in the optimal transmission beam by detecting adjacent beams; beam refinement can further configure multiple signal resources within the selected wide beam angle range for more refined beam search scanning.

[0128] Phase three, recovery after beam failure. In NR-Uu, beam failure detection is achieved by the UE periodically detecting the beam failure recovery reference signal (Beam Failure Recovery Reference Signal, BFR-RS), where BFR-RS can be, for example, CSI-RS and / or SSB. When the UE is configured with the high-level parameter Beam-Failure-Detection-RS-ResourceConfig, the periodic CSI-RS resource index set configured by the high-level signaling is the beam failure detection (Beam Failure Detection, BFD) set; when the UE is not configured with the high-level parameter Beam-Failure-Detection-RS-ResourceConfig, the UE determines the BFD set as a periodic CSI-RS or synchronization signal and / or physical broadcast channel (Synchronization Signal / Physical Broadcast Channel, SS / PBCH) block, and the periodic CSI-RS or SS / PBCH block satisfies the quality control level (Quality Control Level, QCL) relationship with the DMRS of the physical downlink control channel (Physical Downlink Control Channel, PDCCH) 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 lower than the threshold (Qout_LR), the physical (PHY) layer reports a beam failure instance indication (BeamFailure Instance Indication) to the MAC layer, and the MAC layer starts a timer (such as beamFailureDetectionTimer). Within this time window, when the number of beam failure instances (Beam FailureInstance, 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 process.After triggering the BFR process, the UE selects a new beam and sends a BFR request (BFR request, BFRQ) and the newly selected transmit beam (Tx beam) to the base station through the PRACH resource. After that, the UE listens for the Beam Failure Recovery Response (Beam Failure Recovery Response, BFRR) in the specific synchronization signal (specific Synchronization Signal, specific SS) configured by recoverySearchSpaceId. When the UE receives the BFRR, it considers that the BFR process is completed.

[0129] It can be seen that currently, beam management (also called beamforming) is required for communication between base stations and UEs in FR2, and the beam management mechanism of NR-Uu is relatively mature. For scenarios where direct link communication is used between terminal devices, beam management is also required if communication in FR2 is to be achieved. Direct links have characteristics such as distributed communication and reference signal structure, and the existing beam management mechanism cannot be applied to direct link scenarios.

[0130] Based on this, an embodiment of the present application provides a beam management method for a direct link, wherein a first device sends a beam scanning channel for beam measurement, the beam scanning channel is received by a second device, and the beam scanning channel is measured to obtain a beam report, and the beam report is sent to the first device, and the first device receives the beam report sent by the second device, so that the first device determines a target transmission beam based on the beam report, and the target transmission beam is a transmission beam used for communication between the first device and the second device. It can be seen that the method fully considers the characteristics of the direct link, and provides a beam management mechanism suitable for the direct link, which can ensure that when the direct link communication is adopted between terminal devices, the communication is carried out through the target transmission beam in FR2, thereby improving the communication efficiency of the FR2 communication of the direct link.

[0131] It should be noted that the subject implementing the beam management method of the direct link can be the beam management device of the direct link provided in the embodiment of the present application, and the beam management device of the direct link can be carried in the terminal device or the functional module of the terminal device. The terminal device mentioned above can be any device that can implement the beam management method of the direct link in the embodiment of the present application, for example, the terminal device can be a smart phone, a vehicle-mounted terminal, etc.

[0132] It should be noted that when each terminal device has the need to communicate with other terminal devices using a direct link on FR2, the terminal device can serve as the first device in the embodiment of the present application, and take the other party as the second device, execute the method provided in the embodiment of the present application, determine the target transmission beam, and then communicate with the second device using a direct link on FR2 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), as long as the target transmitting beam needs to be determined, the basic process of beam measurement, reporting and indication must be carried out. In the embodiment of the present application, the basic process is referred to as a beam management method. The designed beam management method can be applied to all stages of beam management. The only difference is that: in different stages, the execution scenarios are different. For different execution scenarios, some parameters may be different, but it 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 the direct link provided in the embodiment of the present application, it will be described below with reference to the accompanying drawings.

[0135] Figure 1 A schematic diagram of a beam management method for a direct link provided in an embodiment of the present application. Figure 1 As shown, the method introduces the embodiment of the present application in a way that the first device and the second device interact. There is a need for the first device and the second device to communicate through a direct link on FR2.

[0136] It should be noted that Figure 1 The execution of the method shown can be performed 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 can be performed simultaneously with the first device and the second device establishing a direct link. The embodiment of the present application does not specifically limit the execution timing of the provided method.

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

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

[0139] S102: The second device receives a beam scanning channel sent by the first device.

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

[0141] In some implementations, the beam scanning channel can 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. The signal dedicated to beam measurement may be, for example, 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, indicator bit, Source ID, Destination ID, Zone ID, application identifier, service type information, priority information. The information carried by the control channel may also include at least one of the following: modulation and coding mode, 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, so as 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 channels such as PSSCH that can carry data information. Therefore, it can also be considered that the indicator bit is used to indicate whether the beam scanning channel has channels such as PSSCH that carry data information.

[0145] The reference signal indication information carried by the control channel may include at least one of the following contents: time domain configuration information of the reference signal, frequency domain configuration information of the reference signal, number of reference signal ports or sequence. Among them, the time domain configuration information of the reference signal may include at least one of the following contents: reference signal time domain pattern information, reference signal time domain starting symbol position information or reference signal time domain symbol number information. The frequency domain configuration information of the reference signal may include at least one of the following contents: reference signal frequency domain pattern information, reference signal frequency domain starting PRB position information, reference signal frequency domain starting subchannel position information, reference signal frequency domain occupied PRB number, reference signal frequency domain occupied subchannel number information or reference signal frequency domain shift information. The reference signal frequency domain pattern information may include, for example, at least one of the following contents: starting resource element (RE), comb size, comb offset, cyclic shift or orthogonal cover code (OCC). The reference signal frequency domain shift information may 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. Among them, the beam index information may be indicated by a reference signal port indicator field, or may be indicated by a reference signal sequence, or may be indicated by a combination of a port and a sequence, or may be indicated by reference signal resource information. The beam number information may include: the total number of different beam directions for sending reference signals (for example, the total number of narrow beams corresponding to the current wide beam), the total number of different beam directions for sending control channels (for example, 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: a time interval, a delay limit or a time window information. The time interval may refer to the time interval between the time domain position of sending a beam scanning channel and the time domain starting position of sending a beam report.

[0147] The following describes the application of some of the information carried in the control channel. For Zone ID, it can be used as a priori location information. In some cases, it can be used to narrow the range of beam scanning between devices and improve the efficiency of beam scanning. For application identification and service type information, it can indicate the application type and service type sent by the current device. In some cases, during the beam pairing stage, before or during unicast establishment, it can assist the peer device in determining whether it is interested in the application type or service type of the local device, so that the peer device can choose whether to establish a beam pair link with the local device to avoid the establishment of redundant beam pairs.

[0148] In some possible implementations, configuration information of the beam scanning channel is configured or preconfigured by a high-level 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 a beam scanning channel reference signal, (4) sequence type information, (5) resource type information, or (6) a beam repetition indicator.

[0149] For (1), at least one of the following contents may be included: reference signal time domain pattern information, control channel time domain pattern information, reference signal time domain starting symbol position information, control channel time domain starting 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 pattern information of the reference signal occupied by the resource pool in the time domain symbol position.

[0150] For (2), at least one of the following contents may be included: 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 subchannel position information, control channel frequency domain starting subchannel position information, reference signal frequency domain occupied PRB number, control channel frequency domain occupied PRB number, reference signal frequency domain occupied subchannel number, control channel frequency domain occupied subchannel number or reference signal frequency domain shift information. Among them, the reference signal frequency domain pattern information may include, for example, at least one of the following contents: starting 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: the beam scanning channel period value and the reference signal that can be supported in each period, and the 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 sent in the same beam or in multiple different beams.

[0153] For example, if Figure 2 As shown in FIG. 1 , it is assumed that the first device has eight beam directions for sending beam scanning channels, namely, beam 1, beam 2, ..., beam 8. For the first device, Figure 2 The beam scanning channel is sent in a beam scanning manner for each of the 8 beams in the 8 beams, and the execution Figure 1 In the method shown, each time beam scanning is performed, the first device sends a beam direction of a control channel and Figure 2 The corresponding beam in is the same. Figure 2 The beam in can also be understood as the beam direction.

[0154] As an example, S101 may include: on the resources in the resource pool, sending the control channel in a first beam direction, sending the reference signal in a second beam direction, and the first beam direction and the second beam direction have spatial correlation. 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 and the second beam direction have a QCL relationship, or the first beam direction and the second beam direction at least partially overlap (for example, the first beam direction contains the second beam direction). In S102, the beam direction of the control channel received by the second device in the beam scanning channel is the fifth beam direction, and the beam direction for receiving the reference signal is the fourth beam direction. The first beam direction used to send the control channel on the first device corresponds to the fourth beam direction. Figure 2 For example, the second beam direction in this example can be found in Figure 3 As shown on the left, the fifth beam direction can be seen in Figure 3 The relationship between the beam 41 shown in the middle, the fourth beam direction and the fifth beam direction can be seen, for example, in Figure 3 Shown on the right. Figure 3 The middle beam 41 may refer to a beam direction corresponding to the fourth beam direction or the fifth beam direction and in which a beam report is transmitted.

[0155] As another example, S101 may include, for example: on the resources in the resource pool, sending the control channel in a first beam direction, sending the reference signal in multiple different beam directions, the first beam direction having a spatial correlation with the beam direction for sending 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 for sending reference signals, or the first beam direction at least partially overlaps with multiple beam directions for sending reference signals. In S102, the beam direction of the control channel received by the second device in the beam scanning channel is the ninth beam direction, and the beam direction for receiving the reference signal is the tenth beam direction. The first beam direction used to send the control channel on the first device corresponds to Figure 2 Take beam direction 4 in the example as an example. In this example, multiple beam directions for sending reference signals can be seen in Figure 4 As shown on the left, the ninth beam direction can be seen Figure 4 The beam 41 shown on the right, Figure 4 The beam 42 on the right may refer to a beam direction corresponding to the tenth beam direction in which a beam report is transmitted.

[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 refers to the beam direction of the second device sending the beam report. For the description of the third beam direction, please refer to the relevant description of the third beam direction of the second device sending the beam report in S104 below.

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

[0158] The beam report may include at least: beam identification information, and / or beam measurement value information. The beam identification information may include a beam index and / or a CSI-RS resource indicator (CSI-RS resource indicator, CRI). The beam measurement value information may include at least one of the following: reference signal received power (Reference Signal Receiving Power, RSRP), reference signal received quality (Reference Signal Receiving Quality, RSRQ), signal to interference plus noise ratio (Signal to Interference plus Noise Ratio, SINR), received signal strength indication (Received Signal Strength Indication, RSSI) or CSI measurement results.

[0159] The bearer mode of the beam report may include: bearer mode 1, physical layer signaling of the physical direct link, bearer mode 2, MAC-CE and / or PC5-RRC in PSSCH. Bearer mode 1 may specifically include at least one of the following: 2nd-stage SCI in PSFCH, PSCCH or PSSCH.

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

[0162] It can be seen that 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 sends the beam report in a third beam direction on the resources in the resource pool. The third beam direction may be understood as a beam direction corresponding to the beam direction of the reference signal or control channel in the beam scanning channel received by the second device.

[0166] In one of some possible implementations, a method for determining the third beam direction includes at least one of the following methods: Determination method one, 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 having spatial correlation with the fifth beam direction corresponding to the beam direction for receiving the control channel, and a beam direction having spatial correlation 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 having spatial correlation with the seventh beam direction corresponding to the beam direction for receiving the control channel (i.e., the above-mentioned ninth beam direction), and a beam direction having spatial correlation 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 the first case as the second beam direction being the same as the first beam direction, and in the second case as a pre-configured or pre-configured correspondence between beam directions, and the second beam direction and the first beam direction satisfy the correspondence. The explanation in the first case is taken as an example below.

[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 the first case as the second beam direction including (or can also be called covering) the first beam direction, and in the second case as the second beam direction overlapping with the first beam direction within any non-empty range. The explanation in the first case is taken as an example below.

[0169] For example, for determination method 1, corresponding to Figure 3 In the scenario shown in the middle, beam 4 is the beam direction for the first device to send a control channel or a reference signal, and beam 41 is the beam direction for the second device to receive the control channel and / or reference signal. At this time, the third beam direction should be the same as beam 41 or be a beam direction that includes beam 41.

[0170] For example, for determination method 2, corresponding to Figure 4In the scenario shown on the right, beam 4 is the beam for the first device to send a control channel, and the four fine beams in beam 4 are the beam directions for sending reference signals (numbered from left to right as beam a, beam b, beam c, and beam d); beam 41 is the beam for the second device to receive the control channel, and beam 42 is the beam for receiving the reference signal on beam c, and the beam report of the second device carries the information of beam c, then 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 in S104 sends a beam report to the first device, which may follow: sending rule one, the second device sends the beam report according to the beam report indication information included in the control channel of the beam scanning channel, or according to high-level configuration or pre-configured time interval information or feedback delay information or time window information; sending rule two, the second device sends the beam report using PSFCH on the corresponding time-frequency resources according to the mapping rule between the beam scanning channel and PSFCH.

[0172] For sending rule 1, the second device can send a beam report after completing all measurements on all beam scanning channels. Figure 2 In the beam direction division scenario shown, the second device executes S104 after completing the measurement of the beam scanning channels in all 8 directions.

[0173] As an example, the second device can obtain the timing of sending the beam report based on the beam measurement auxiliary information carried by the first device in the control channel; or, the second device can obtain the timing of sending the beam report based on the high-level configuration or pre-configuration. When the beam report indication in the control channel carries the time interval, or, when the high-level parameters configure or pre-configure the time interval, the second device can determine the time domain starting position for sending the beam report based on the carried time interval information. When the control channel does not carry a beam report indication, the second device can determine whether the measurement of all beam scanning channels is completed based on the beam number information and / or beam resource indication information carried in the control channel sent by the first device, or, the second device can determine whether the beam report needs to be sent based on the high-level parameter configuration or pre-configured beam number information.

[0174] As another example, if the control channel received by the second device contains delay limit or time window information, or the high-level parameter configuration or pre-configuration of the second device has delay limit or time window information, the second device can feed back the corresponding beam report under the condition that the delay limit or time window information is met. The delay limit is the upper limit of the feedback time of the measurement result of the beam, and the specific feedback time should be less than the delay limit.

[0175] In some possible implementations, in order to ensure that the first device can effectively receive the beam report, the beam report of the second device needs to be sent repeatedly, and the number of transmissions can be determined according to the beam number information carried in the control channel sent by the first device, or can also be determined according to the high-level parameter configuration or pre-configured beam number information of the second device. After S101, the first device can switch all beams for reception to ensure that the beam report can be effectively received to avoid the occurrence of an event in which the beam report cannot be received due to inconsistent beam directions. For example, Figure 5 As shown, after the first device sends 8 beam scanning channels, the first device switches the receiving beam direction to accurately receive the beam report. After the second device measures the 8 beam scanning channels to obtain the beam report, it repeatedly sends the beam report, and the number of repeated transmissions is determined based on the beam number information.

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

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

[0178] As an example, when the first device sends reference signals in multiple different beam directions, and these reference signals have the same PSCCH beam, the third beam direction of the transmit beam report is the same as the first beam direction of the control channel in the receive beam scanning channel, or the third beam direction includes the first beam direction (that is, the third beam direction is wider than the first beam direction). Figure 6 As shown, the first device receives a beam report in a first beam direction of a corresponding control channel. Optionally, beam report resources in different beam directions are frequency division multiplexed (Frequency Division Multiplexing, FDM).

[0179] As another example, when the first device sends a reference signal in the second beam direction, the third beam direction of the beam report is the beam direction of the control channel sent by the first device, or includes the beam direction of the control channel sent by the first device; or, the third beam direction corresponds to the beam direction of the reference signal received by the second device, or includes the beam direction of the reference signal received by the second device. Figure 7 As shown, the first device receives a beam report in a first beam direction for sending a control channel, or receives a beam report in a second beam direction for sending a reference signal.

[0180] It should be noted that, corresponding to the above-mentioned sending rule 2, the second device uses PSFCH to carry the beam report, and the first device in S105 can use the beam direction of sending the control channel or the reference signal to receive the beam report on the corresponding time-frequency resources. Among them, the "corresponding" in "corresponding time-frequency resources" can be understood as: corresponding to the beam scanning channel, or, corresponding to the reference signal. In addition, the first device can receive the beam report in the form of beam scanning according to the beam report indication information included in the control channel of the beam scanning channel, or according to the high-level configuration or pre-configured time interval information or delay limit information or time window information. For example, corresponding to the above-mentioned sending rule 1, the first device receives the beam report in the form of beam scanning.

[0181] In the case where the beam report is carried by the PSFCH channel, the PSFCH may be carried by multiplexing, and the multiplexing may include at least one of the following multiplexing methods: RE multiplexing, FDM, or time division multiplexing (TDM). For example, in TDM or TDM+FDM mode, the PSFCH carrying the beam report has the same period as the existing PSFCH, or has 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), such as Figure 8 In the example, M=4, the existing PSFCH period N is 2 symbols, and the interval N' of the PSFCH carrying the beam report is 8 symbols. For another example, using the FDM method, for example, see Fig. 9 As shown, the PSFCH carrying the beam report has the same period as the existing PSFCH, which is N=2 symbols. For another example, a separate PSFCH time domain resource period is configured for the beam report, for example, Fig.10 As shown, the interval of the PSFCH carrying beam reports is 1 symbol (regardless of the existing PSFCH period), and the existing PSFCH period N is 2 symbols.

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

[0183] As an example, S106 may include: when the first device receives only one beam report after sending a beam scanning channel, then, 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 by the beam report; when the first device receives multiple beam reports after sending a beam scanning channel, the method for determining the target transmitting beam includes at least one of the following methods: Method 1, determining the target transmitting beam according to the beam identification information indicated in the latest received beam report; Method 2, selecting the target transmitting 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 the transmit beam and the receive beam. 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. The first device uses the target transmit beam to send data information to the second device on the direct link, and the first device receives the data information sent 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, the method may further include after S106: the first device sends beam indication information to the second device, and the information that the beam indication information may carry 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] It is understandable that in order to facilitate the reader's understanding, the following Fig.11 , 12 13 introduces the structure of the stand-alone reference signal. Fig.11 As shown, the RSs in a time slot are all sent in the same beam direction, and the first beam direction for sending the control channel can be the same as or wider than the second beam direction for sending the reference signal. Fig.12 As shown, RSs in a slot are sent in different beam directions, and the first beam direction for sending the control channel at least includes different beam directions for sending RSs. Fig.13, which is a mini-slot structure, the first beam direction of sending the control channel can be the same as or wider than the second beam direction of its corresponding reference signal.

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

[0188] It should be noted that the multiplexing mode of 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 scheme may be a comb-shaped mapping structure, and 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 may be indicated by the information display in the control channel, or may be configured or pre-configured by high-level parameters. Alternatively, it is also possible to limit the frequency domain bandwidth that the beam scanning channel frequency domain needs to occupy in the entire resource pool.

[0190] It should be noted that for Fig.12 The first orthogonal frequency-division multiplexing (OFDM) symbol in the time domain that carries RSs in different beam directions can be used for automatic gain control (AGC) processing. The specific implementation method may 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] It can be seen that, through the method of the embodiment of the present application, through the interaction process between the first device and the second device, a beam management scheme suitable for a direct link on FR2 is designed to support devices to communicate in the beam domain on FR2. A method for sending and receiving beam scanning channels in the beam domain is designed, and the sending beam, carrying content, carrying method and sending rules of the beam report are also defined. Moreover, the structure and configuration information of the beam scanning channel are designed, and so on. In short, the method fully considers the characteristics of the direct link, such as the distributed communication characteristics and reference signal structure of the direct link, and proposes a beam management mechanism suitable for the direct link, which can ensure that when the direct link communication is adopted between terminal devices, the communication is carried out through the target sending beam in FR2, thereby improving the communication efficiency of the FR2 communication of the direct link.

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

[0193] Accordingly, the embodiment of the present application also provides a beam management device 1400 for a direct link, such as Fig.14 The apparatus 1400 is applied to a first device and includes:

[0194] A sending unit 1401 is used to send a beam scanning channel, where the beam scanning channel is used for beam measurement;

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

[0196] The determination unit 1403 is used to determine a target transmission beam based on the beam report, where the target transmission beam is a transmission beam used by the first device to communicate with the second device.

[0197] Optionally, the beam scanning channel includes a control channel and a reference signal, and the sending unit 1401 is specifically configured to:

[0198] Sending the control channel in a first beam direction, and sending the reference signal in a second beam direction, wherein the first beam direction and the second beam direction have spatial correlation;

[0199] Alternatively, the control channel is sent in a first beam direction, and the reference signal is sent in multiple different beam directions, and the first beam direction has a spatial correlation with the beam direction for sending the reference signal;

[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 contents: reference signal indication information, beam measurement auxiliary information, indicator 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 contents: modulation and coding method, MCS table indication, HARQ related information, 2nd-stage SCI format and time-frequency domain information, and reserved bits.

[0204] Optionally,

[0205] The indication 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 contents: 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, wherein the time domain configuration information of the reference signal includes at least one of the following contents: time domain pattern information of the reference signal, time domain starting symbol position information of the reference signal, or time domain symbol number information of the reference signal, and the frequency domain configuration information of the reference signal includes at least one of the following contents: frequency domain pattern information of the reference signal, frequency domain starting PRB position information of the reference signal, frequency domain starting subchannel position information of the reference signal, number of PRBs occupied by the reference signal frequency domain, number of subchannels occupied by the reference signal frequency domain, or frequency domain shift information of the reference signal;

[0207] The beam measurement auxiliary information includes at least one of the following contents: 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 contents: 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 high layer, and the configuration information includes at least one of the following: time domain configuration information, frequency domain configuration information, sequence identification information of a beam scanning channel reference signal, sequence type information, resource type information, or a beam repetition indication bit;

[0209] The beam repetition indication bit is used to indicate whether the reference signal is sent in the same beam or in 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 starting symbol position information, control channel time domain starting symbol position information, reference signal time domain symbol number information, control channel time domain symbol number information or pattern information of reference signal occupied time domain symbol position supported by resource pool

[0211] The frequency domain configuration information includes at least one of the following contents: 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 subchannel position information, control channel frequency domain starting subchannel position information, the number of PRBs occupied by the reference signal frequency domain, the number of PRBs occupied by the control channel frequency domain, the number of subchannels occupied by the reference signal frequency domain, the number of subchannels 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 value information.

[0213] Optionally, the receiving unit 1402 is specifically configured to:

[0214] Receiving the beam report on a corresponding time-frequency resource using a beam direction for sending the control channel or the reference signal;

[0215] Alternatively, the beam report is received in the form of beam scanning according to the beam report indication information included in the control channel of the beam scanning channel, or according to high-level configured or pre-configured time interval information or delay limit information or time window information.

[0216] Optionally, the determining unit 1403 is specifically configured to:

[0217] When only one beam report is received after the beam scanning channel is transmitted, 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;

[0218] When a plurality of beam reports are received after the beam is transmitted to scan the channel, the method for determining the target transmitting beam includes at least one of the following methods: determining the target transmitting beam based on the beam identification information indicated in the latest received beam report; or selecting the target transmitting beam based on the reference signal measurement values ​​in the plurality of beam reports.

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

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

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

[0222] Accordingly, the embodiment of the present application also provides a beam management device 1500 for a direct link, such as Fig.15 The apparatus 1500 is applied to a second device and includes:

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

[0224] A measuring unit 1502 is configured to measure the beam scanning channel to obtain a beam report;

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

[0226] Optionally, the sending unit 1503 is specifically configured to:

[0227] The beam report is sent in a third beam direction.

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

[0229] When the reference signal is received in a fourth beam direction, the third beam direction is one of the following directions: a beam direction having spatial correlation with a fifth beam direction corresponding to a beam direction for receiving the control channel, and a beam direction having spatial correlation with a 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 having spatial correlation with a seventh beam direction corresponding to a beam direction for receiving the control channel, and a beam direction having spatial correlation with an eighth beam direction corresponding to a beam direction indicated in receiving 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 carrying method of the beam report includes: physical layer signaling of a physical direct link, and / or MAC-CE in PSSCH, and / or PC5-RRC, wherein the physical layer signaling of the direct link includes at least one of the following: 2nd-stage SCI in PSFCH, PSCCH or PSSCH.

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

[0234] According to the mapping rule 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 sending the control channel and / or reference signal of the beam scanning channel by the first device, and the beam measurement auxiliary information of the control channel in the beam scanning channel. The sending unit 1503 is specifically used to:

[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 high-level configuration or pre-configured time interval information or feedback delay information or time window information.

[0237] Optionally, the sending unit 1503 is specifically configured to:

[0238] The beam report is sent when at least one candidate transmit beam in the beam report meets a preset condition, wherein the preset condition includes: a transmission quality represented by a measurement result of at least one candidate transmit beam in the beam report is higher than the measurement results of all candidate transmit beams in a historical beam report.

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

[0240] In addition, the embodiment of the present application also provides a beam management system 1600 for a direct link, see Fig.16 The system 1600 includes a first device 1601 and a second device 1602, and the system 1600 is used to perform beam management on a direct link between the first device 1601 and the second device 1602,

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

[0242] The second device 1602 is used to Figure 1 Steps performed by the second device in .

[0243] In addition, the present application embodiment also provides a terminal device 1700, such as Fig.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 method provided.

[0246] In addition, an embodiment of the present application further provides a storage medium, which is used to store a program, and the program runs on a processor to execute the method provided by the embodiment of the present application.

[0247] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here. In addition, the "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally represents that the objects associated with each other are in an "or" relationship.

[0248] Through the description of the above implementation methods, it can be known that those skilled in the art can clearly understand that all or part of the steps in the above-mentioned embodiment method can be implemented by means of software plus a general hardware platform. Based on such an understanding, the technical solution of the present application can be embodied in the form of a software product, which can be stored in a storage medium, such as a read-only memory (ROM) / RAM, a magnetic disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network communication device such as a router) to execute the methods described in each embodiment of the present application or some parts of the embodiments.

[0249] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for system embodiments and device embodiments, since they are basically similar to method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. The device and system embodiments described above are merely schematic, in which the modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0250] The above is only a preferred embodiment of the present application and is not intended to limit the protection scope of the present application. It should be noted that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the present application, and these improvements and modifications should also be regarded as the protection scope of the present application.

Claims

1. A beam management method for a direct link, characterized in that: Applied to a first device, the method includes: sending a beam scanning channel, wherein the beam scanning channel is used for beam measurement; receiving a beam report sent by a second device, where the beam report is obtained by the second device receiving and measuring the beam scanning channel; Based on the beam report, a target transmit beam is determined, where the target transmit beam is the transmit beam used by the first device to communicate with the second device.

2. The method according to claim 1, characterized in that The beam scanning channel includes a control channel and a reference signal, and the transmitting beam scanning channel includes: Sending the control channel in a first beam direction, and sending the reference signal in a second beam direction, wherein the first beam direction and the second beam direction have spatial correlation; Alternatively, the control channel is sent in a first beam direction, and the reference signal is sent in multiple different beam directions, and the first beam direction has a spatial correlation with the beam direction for sending the reference signal; Wherein, the spatial correlation includes at least one of the following: having a quasi-co-sited QCL relationship, or at least partially overlapping.

3. The method according to claim 2, 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 contents: reference signal indication information, beam measurement auxiliary information, indication bit, source identifier SourceID, destination identifier DestinationID, application identifier ApplicationID, service type information, zone identifier ZoneID, and priority information.

4. The method according to claim 3, characterized in that: The indication 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 contents: 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, wherein the time domain configuration information of the reference signal includes at least one of the following contents: time domain pattern information of the reference signal, time domain starting symbol position information of the reference signal, or time domain symbol number information of the reference signal, and the frequency domain configuration information of the reference signal includes at least one of the following contents: frequency domain pattern information of the reference signal, frequency domain starting physical resource block PRB position information of the reference signal, frequency domain starting subchannel position information of the reference signal, number of PRBs occupied by the reference signal frequency domain, number of subchannels occupied by the reference signal frequency domain, or frequency domain shift information of the reference signal; The beam measurement auxiliary information includes at least one of the following contents: 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 contents: time interval, delay limit or time window information.

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

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

7. The method according to any one of claims 2 to 5, characterized in that: The receiving a beam report sent by the second device includes: Receiving the beam report on a corresponding time-frequency resource using a beam direction for sending the control channel or the reference signal; Alternatively, the beam report is received in the form of beam scanning according to the beam report indication information included in the control channel of the beam scanning channel, or according to high-level configured or pre-configured time interval information or delay limit information or time window information.

8. The method according to claim 1, characterized in that The determining a target transmit beam based on the beam report includes: When only one beam report is received after the beam scanning channel is transmitted, 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; When a plurality of beam reports are received after the beam scanning channel is transmitted, the method for determining the target transmitting beam includes at least one of the following methods: determining the target transmitting beam based on the beam identification information indicated in the latest received beam report; or selecting the target transmitting beam based on the reference signal measurement values ​​in the plurality of beam reports.

9. The method according to any one of claims 1 to 8, characterized in that: The method further comprises: Send beam indication information to the second device, where the beam indication information includes: beam identification information of the target transmitting beam, and / or activation time of the target transmitting beam.

10. A beam management method for a direct link, characterized in that: Applied to the second device, the method includes: receiving a beam scanning channel sent by a first device, where the beam scanning channel is used for beam measurement; Measuring the beam scanning channel to obtain a beam report; The beam report is sent to the first device, and the beam report is used by the first device to determine a target transmit beam used for communicating with the second device.

11. The method according to claim 10, characterized in that The sending the beam report to the first device includes: sending the beam report in a third beam direction; 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 methods: When the reference signal is received in a fourth beam direction, the third beam direction is one of the following directions: a beam direction having spatial correlation with a fifth beam direction corresponding to a beam direction for receiving the control channel, and a beam direction having spatial correlation with a 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 having spatial correlation with a seventh beam direction corresponding to a beam direction for receiving the control channel, and a beam direction having spatial correlation with an eighth beam direction corresponding to a beam direction indicated in receiving the beam report; Wherein, the spatial correlation includes at least one of the following: having a quasi-co-sited QCL relationship, or at least partially overlapping.

12. The method according to claim 10 or 11, characterized in that: The carrying method of the beam report includes: physical layer signaling of a physical direct link, and / or a media access control layer control unit MAC-CE in a physical direct link shared channel PSSCH, and / or a direct link radio resource control PC5-RRC, wherein the direct link physical layer signaling includes at least one of the following contents: a physical direct link feedback channel PSFCH, a physical direct link control channel PSCCH or a 2nd-stage SCI in PSSCH.

13. The method according to claim 12, characterized in that The beam report is carried by the PSFCH, the time-frequency resources of the beam report are obtained by the time-frequency resources occupied by the control channel and / or the reference signal of the beam scanning channel sent by the first device, and the sending of the beam report to the first device includes: According to the mapping rule between the beam scanning channel and PSFCH, the beam report is sent to the first device using PSFCH on the corresponding time-frequency resources.

14. The method according to claim 12, characterized in that The beam report is carried by PSCCH and / or PSSCH, the time-frequency resources of the beam report are obtained by sending the control channel and / or the time-frequency resources occupied by the reference signal of the beam scanning channel by the first device, and the beam measurement auxiliary information of the control channel in the beam scanning channel, and sending 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 or delay information or time window information configured by a high layer or preconfigured.

15. The method according to any one of claims 10 to 14, characterized in that: The sending the beam report to the first device includes: The beam report is sent when at least one candidate transmit beam in the beam report meets a preset condition, wherein the preset condition includes: a transmission quality represented by a measurement result of at least one candidate transmit beam in the beam report is higher than the measurement results of all candidate transmit beams in a historical beam report.

16. A beam management device for a direct link, characterized in that: Applied to a first device, the apparatus comprises: A sending unit, used for sending a beam scanning channel, where the beam scanning channel is used for beam measurement; A receiving unit, configured to receive a beam report sent by a second device, where the beam report is obtained by the second device receiving and measuring the beam scanning channel; A determination unit is used to determine a target transmission beam based on the beam report, where the target transmission beam is a transmission beam used by the first device to communicate with the second device.

17. A beam management device for a direct link, characterized in that: Applied to a second device, the apparatus comprises: A receiving unit, configured to receive a beam scanning channel sent by the first device, wherein the beam scanning channel is used for beam measurement; A measuring unit, configured to measure the beam scanning channel to obtain a beam report; A sending unit is used to send the beam report to the first device, and the beam report is used by the first device to determine a target transmission beam used for communicating with the second device.

18. 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 to perform beam management on a direct link between the first device and the second device. The first device is used to execute the method according to any one of claims 1 to 9; The second device is used to execute the method according to any one of claims 10-15.

19. 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 to 15 according to the program.

20. A storage medium, characterized in that: The storage medium is used to store a program, and the program runs on a processor to execute the method according to any one of claims 1 to 15.

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