Method and apparatus in a node for wireless communication

Abstract

The invention provides a method and a device in a node for wireless communication, which are favorable for solving the synchronization problem of introducing carrier aggregation in a sidewalk communication system. The method comprises the following steps: respectively carrying out measurement on all frequencies in a first frequency subset to obtain a plurality of measurement results; wherein the first parameter and the first threshold are used for determining whether to transmit the side synchronization signal block on one or more frequencies in a first frequency set, the plurality of measurement results are used for determining the first parameter, and the first frequency subset belongs to the first frequency set.

Description

[0001] This divisional application is a divisional application based on the parent patent application with application number CN202380011757.8 and application date October 25, 2023. The entire contents of the parent patent application are incorporated by reference in this divisional application. Technical Field

[0002] The present application relates to the field of communication technology, and more specifically, to a method and device in a node for wireless communication. Background Art

[0003] In sidelink (SL) communication, the data transmission rate of the sidelink can be increased by supporting sidelink carrier aggregation (SL CA). In the synchronization process of traditional SL CA, the terminal device determines whether to send a sidelink synchronization signal on the aggregated carrier based on the measurement result on the synchronization carrier.

[0004] However, all aggregated carriers may include some carriers with poor coverage, and abandoning the transmission of side synchronization signals may affect SL communication. Therefore, the synchronization problem after the introduction of carrier aggregation in the SL system needs to be solved urgently. Furthermore, the inability of non-synchronous carriers to perform SL communication and the imbalance of synchronous coverage on multiple SL carriers are technical problems that need to be solved. Summary of the invention

[0005] The embodiments of the present application provide a method and device in a node for wireless communication. The following introduces various aspects involved in the present application.

[0006] In a first aspect, a method is provided in a first node for wireless communication, comprising: performing measurements on all frequencies in a first frequency subset respectively to obtain multiple measurement results; wherein a first parameter and a first threshold are used to determine whether to send a side synchronization signal block on one or more frequencies in the first frequency set, the multiple measurement results are used to determine the first parameter, and the first frequency subset belongs to the first frequency set.

[0007] In a second aspect, a method is provided in a second node for wireless communication, comprising: sending first information, the first information comprising a second frequency set, the second frequency set being used by the first node to determine a first frequency set, the first frequency set comprising a first frequency subset; wherein a first parameter and a first threshold are used by the first node to determine whether to send a side synchronization signal block on one or more frequencies in the first frequency set, the first parameter being determined based on multiple measurement results, and the multiple measurement results being obtained by measurements performed by the first node on all frequencies in the first frequency subset respectively.

[0008] According to a third aspect, a method is provided in a first node for wireless communication, comprising: a processor, configured to perform measurements on all frequencies in a first frequency subset respectively to obtain multiple measurement results; wherein a first parameter and a first threshold are used to determine whether to send a side synchronization signal block on one or more frequencies in the first frequency set, the multiple measurement results are used to determine the first parameter, and the first frequency subset belongs to the first frequency set.

[0009] In a fourth aspect, a second node for wireless communication is provided, comprising: a third transmitter, used to send first information, the first information including a second frequency set, the second frequency set is used by the first node to determine a first frequency set, the first frequency set including a first frequency subset; wherein a first parameter and a first threshold are used by the first node to determine whether to send a side synchronization signal block on one or more frequencies in the first frequency set, the first parameter is determined based on multiple measurement results, and the multiple measurement results are obtained by measurements performed by the first node on all frequencies in the first frequency subset respectively.

[0010] In a fifth aspect, a first node used for wireless communication is provided, comprising a transceiver, a memory and a processor, wherein the memory is used to store programs, the processor is used to call the programs in the memory and control the transceiver to receive or send signals so that the first node executes the method described in the first aspect.

[0011] In a sixth aspect, a second node used for wireless communication is provided, comprising a transceiver, a memory and a processor, wherein the memory is used to store programs, the processor is used to call the programs in the memory and control the transceiver to receive or send signals so that the second node executes the method described in the second aspect.

[0012] In a seventh aspect, an embodiment of the present application provides a communication system, which includes the first node and / or the second node described above. In another possible design, the system may also include other devices that interact with the first node or the second node in the solution provided in the embodiment of the present application.

[0013] In an eighth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program enables a computer to execute part or all of the steps in the methods of the above aspects.

[0014] In a ninth aspect, an embodiment of the present application provides a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to cause a computer to execute some or all of the steps in the above-mentioned various aspects of the method. In some implementations, the computer program product can be a software installation package.

[0015] In the tenth aspect, an embodiment of the present application provides a chip, which includes a memory and a processor. The processor can call and run a computer program from the memory to implement some or all of the steps described in the methods of the above aspects.

[0016] In an embodiment of the present application, the first node performs measurements on all frequencies in the first frequency subset respectively, and determines whether to send a side synchronization signal block based on multiple measurement results. The first frequency subset includes some or all frequencies in the first frequency set that can be used for synchronization. It can be seen that the first node considers the measurement results of multiple frequencies when determining whether to send a side synchronization signal block, rather than determining it based on only one measurement result of the synchronization carrier frequency, thereby effectively solving the problem of uneven multi-frequency synchronization coverage in SL CA operation.

[0017] In the embodiment of the present application, the technical solution that the first node determines whether to send the side synchronization signal block according to multiple measurement results and the first threshold value optimizes the side synchronization signal block sending mechanism stimulated by the measurement results. Further, the technical solution also optimizes the determination mechanism of the node to decide whether to send the side synchronization signal block, or in other words, optimizes the determination mechanism of the node to decide whether to become a synchronization reference.

[0018] In an embodiment of the present application, the first node determines whether to send a side synchronization signal block based on multiple measurement results. It can be seen that even if the measurement result of the synchronization frequency shows that it is not necessary to send a side synchronization signal block, SL communication can still be performed by sending a side synchronization signal block at a frequency with weak synchronization coverage. Therefore, in an embodiment of the present application, the first node can also expand the SL communication range at a frequency with weak synchronization coverage, thereby expanding the synchronization coverage range of multiple frequencies in the SL CA operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an example diagram of the system architecture of a wireless communication system applicable to the embodiments of the present application.

[0020] Figure 2 The figure is a flowchart of the related SL CA synchronization process.

[0021] Figure 3 Schematic diagram of the distribution of multiple S-SSBs in one cycle.

[0022] Figure 4 A flowchart of a method in a first node for wireless communication provided in an embodiment of the present application.

[0023] Figure 5 A flowchart of a method in a second node for wireless communication provided in an embodiment of the present application.

[0024] Figure 6 for Figure 4 A flowchart of a possible implementation of the method shown.

[0025] Figure 7 A flowchart of a possible implementation method for determining whether to send a side synchronization signal block.

[0026] Figure 8 A flowchart of another possible implementation method for determining whether to send a side synchronization signal block.

[0027] Fig. 9 for Figure 4 A flowchart of another possible implementation of the method is shown.

[0028] Fig.10 A schematic diagram of the structure of a first node for wireless communication provided in an embodiment of the present application.

[0029] Fig.11 A schematic diagram of the structure of a second node for wireless communication provided in an embodiment of the present application.

[0030] Fig.12 A schematic structural diagram of a device provided in an embodiment of the present application.

[0031] Fig.13 A schematic diagram of the hardware modules of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] The following will describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. For the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] Figure 1 1 is a diagram showing an example of the system architecture of a wireless communication system 100 to which the embodiments of the present application are applicable. The wireless communication system 100 may include a network device 110 and user devices 121 to 129. The network device 110 may provide communication coverage for a specific geographical area and may communicate with terminals located in the coverage area.

[0034] In some implementations, SL communication may be performed between user equipment (UE) and user equipment. SL communication may also refer to sidelink communication, proximity based services (ProSe) communication, unilateral communication, sidelink communication, device to device (D2D) communication, etc.

[0035] In other words, sidelink synchronization and / or sidelink broadcast are transmitted between user equipment and user equipment via the sidelink. Among them, the sidelink synchronization may include a sidelink synchronization signal and / or a sidelink reference signal and / or a sidelink synchronization broadcast channel block, and the sidelink broadcast may include a sidelink broadcast channel or a sidelink synchronization broadcast channel block. In some implementations, the sidelink synchronization signal may be, for example, a sidelink primary synchronization signal (S-PSS), a sidelink secondary synchronization signal (S-SSS), a sidelink synchronization signal / physical sidelink broadcast channel block (S-SS / PSBCH block, S-SSB). In some implementations, the sidelink reference signal may be, for example, a sidelink channel state information reference signal (CSI-RS), a sidelink demodulation reference signal (DMRS). In some implementations, the sidelink broadcast channel may be, for example, a physical sidelink broadcast channel (PSBCH), a sidelink synchronization signal / physical sidelink broadcast channel block, a sidelink broadcast channel (SL-BCH), etc.

[0036] In other words, sidelink data is transmitted between user equipment and user equipment via a sidelink. The sidelink data may include data and / or control signaling. In some implementations, the sidelink data may be, for example, a physical sidelink control channel (PSCCH), a physical sidelink shared channel (PSSCH), a PSCCH DMRS, a PSSCH DMRS, a physical sidelink feedback channel (PSFCH), etc.

[0037] Combined with the following Figure 1 This section introduces several common sidelink communication scenarios. In sidelink communication, three scenarios can be divided according to whether the user equipment in the sidelink is within the coverage of the network device. Scenario 1: The user equipment performs sidelink communication within the coverage of the network device. Scenario 2: Some user equipment performs sidelink communication within the coverage of the network device. Scenario 3: The user equipment performs sidelink communication outside the coverage of the network device.

[0038] like Figure 1 As shown, in scenario 1, user equipments 121-122 can communicate via a side link, and user equipments 121-122 are all within the coverage of network device 110, or in other words, user equipments 121-122 are all within the coverage of the same network device 110. In this scenario, network device 110 can send configuration signaling to user equipments 121-122, and accordingly, user equipments 121-122 communicate via a side link based on the configuration signaling.

[0039] like Figure 1 As shown, in scenario 2, user equipment 123-124 can communicate via the side link, and user equipment 123 is within the coverage of network device 110, and user equipment 124 is outside the coverage of network device 110. In this scenario, user equipment 123 receives the configuration information of network device 110 and communicates via the side link based on the configuration of the configuration signaling. However, for user equipment 124, since user equipment 124 is outside the coverage of network device 110, it is unable to receive the configuration information of network device 110. At this time, user equipment 124 can obtain the configuration of the side link communication according to the pre-configuration configuration information and / or the configuration information sent by user equipment 123 within the coverage, so as to communicate with user equipment 123 via the side link based on the acquired configuration.

[0040] In some cases, user equipment 123 may send the above configuration information to user equipment 124 via PSBCH to configure user equipment 124 to communicate via the sidelink.

[0041] like Figure 1 As shown, in scenario 3, user equipments 125-129 are all outside the coverage of network device 110 and cannot communicate with network device 110. In this case, user equipments can all perform sidelink communication based on preconfigured information.

[0042] In some cases, user devices 127-129 located outside the coverage of the network device can form a communication group, and the user devices 127-129 in the communication group can communicate with each other. In addition, the user device 127 in the communication group can serve as a central control node, also known as a cluster header (CH), and correspondingly, the user devices in other communication groups can be called "group members".

[0043] It should be noted that Figure 1 A network device and multiple user devices are shown exemplarily. Optionally, the wireless communication system 100 may include multiple network devices and each network device may include another number of user devices within its coverage area, which is not limited in the embodiments of the present application.

[0044] Optionally, the wireless communication system 100 may also include other network entities such as a network controller and a mobility management entity, which is not limited in the embodiments of the present application.

[0045] It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: the fifth generation (5th generation, 5G) system or the new radio (new radio, NR) system, the long term evolution (long term evolution, LTE) system, the LTE frequency division duplex (frequency division duplex, FDD) system, the LTE time division duplex (time division duplex, TDD) system, etc. The technical solutions provided in the present application can also be applied to future communication systems, such as the sixth generation mobile communication system, and satellite communication systems, etc.

[0046] The user equipment in the embodiment of the present application may also be referred to as terminal equipment, access terminal, user unit, user station, mobile station, mobile station (MS), mobile terminal (MT), remote station, remote terminal, mobile device, user terminal, wireless communication device, user agent or user device. The user equipment in the embodiment of the present application may be a device that provides voice and / or data connectivity to a user, and may be used to connect people, objects and machines, such as handheld devices with wireless connection functions, vehicle-mounted devices, etc. The user equipment in the embodiment of the present application may be a mobile phone, a tablet computer (Pad), a laptop computer, a PDA, a mobile internet device (MID), a wearable device, a vehicle, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc. Optionally, the user equipment may act as a base station. For example, the user equipment can act as a dispatching entity that provides sidelink signals between user equipment in vehicle-to-everything (V2X) or D2D, etc. For example, a cell phone and a car communicate with each other using sidelink data. A cell phone and a smart home device communicate with each other without relaying the communication signal through a base station.

[0047] The network device in the embodiment of the present application may be a device for communicating with a user device, and the network device may also be referred to as an access network device or a radio access network device, such as a base station. The network device in the embodiment of the present application may refer to a radio access network (RAN) node (or device) that connects a user device to a wireless network. Base station can broadly cover various names as follows, or replace with the following names, such as: NodeB, evolved NodeB (eNB), next generation NodeB (gNB), relay station, transmission point (transmitting and receiving point, TRP), transmission point (transmitting point, TP), access point (access point, AP), master station MeNB, auxiliary station SeNB, multi-standard radio (MSR) node, home base station, network controller, access node, wireless node, transmission node, transceiver node, base band unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. The base station can be a macro base station, a micro base station, a relay node, a donor node or the like, or a combination thereof. The base station can also refer to a communication module, a modem or a chip used to be set in the aforementioned device or apparatus. The base station can also be a mobile switching center and a device that performs the base station function in D2D, V2X, machine-to-machine (M2M) communication, a network side device in a 6G network, and a device that performs the base station function in a future communication system. The base station can support networks with the same or different access technologies. The embodiments of the present application do not limit the specific technology and specific device form adopted by the network device.

[0048] Base stations can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile base station, and one or more cells can move based on the location of the mobile base station. In other examples, a helicopter or drone can be configured to act as a device that communicates with another base station.

[0049] In some deployments, the network device in the embodiments of the present application may refer to a CU or a DU, or the network device includes a CU and a DU. The gNB may also include an AAU.

[0050] The network equipment and user equipment can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on the water surface; they can also be deployed on aircraft, balloons and satellites in the air. The embodiments of the present application do not limit the scenarios in which the network equipment and user equipment are located.

[0051] It should be understood that all or part of the functions of the communication device in the present application may also be implemented by software functions running on hardware, or by virtualization functions instantiated on a platform (eg, a cloud platform).

[0052] For ease of understanding, some relevant technical knowledge involved in the embodiments of the present application is first introduced. The following related technologies can be arbitrarily combined with the technical solutions of the embodiments of the present application as optional solutions, and they all belong to the protection scope of the embodiments of the present application. The embodiments of the present application include at least part of the following contents.

[0053] It should be understood that the interpretation of the terms in the embodiments of the present application can refer to the specification protocols TS36 series, TS37 series and TS38 series of the 3rd generation partnership project (3GPP), but can also refer to the specification protocols of the Institute of Electrical and Electronics Engineers (IEEE).

[0054] With the development of communication technology, technical research and standardization of SL communication are gradually being carried out. The SL communication developed in the RAN of 5G NR release-16 (Rel-16) is mainly used to support advanced V2X applications. In Rel-17, the system architecture working group 2 (SA2) specifically studies and standardizes ProSe including public safety and commercial related services. As part of Rel-17, in order to save power consumption for battery-constrained users and improve the reliability of SL communication, the radio access network working group 1 (RAN1) and RAN2 developed power saving technologies (such as partial sensing, discontinuous reception (DRX) and inter-UE coordination (IUC) technology).

[0055] The application areas of SL communication are also gradually expanding. For example, although NR SL was originally developed to support V2X applications, the industry is increasingly keen to expand NR SL to more commercial use cases. For example, highly automated driving technology requires sharing a large amount of sensor information between vehicles.

[0056] As the application field of SL communication continues to expand, higher requirements are placed on NR SL. These requirements include two key needs: increasing the sidelink data rate and supporting more new carriers on the sidelink. Under SL communication, the sidelink data rate can be increased by supporting SL CA; by adding more new carriers, the transmission bandwidth can be expanded, thereby further increasing the data rate. Therefore, how to introduce carrier aggregation in the NR SL communication system has become one of the issues.

[0057] The SL CA in the embodiment of the present application can be based on LTE SL CA. Furthermore, the SL CA in the embodiment of the present application can have the following features:

[0058] Exemplarily, the SL CA in the embodiments of the present application may be limited to intra-band carrier aggregation (intra-band CA) in the intelligent traffic system (ITS) band and frequency range 1 (FR1) (i.e., Bandn47);

[0059] Exemplarily, the SL CA in the embodiment of the present application may work in mode 2 of resource allocation;

[0060] Exemplarily, each carrier of the SL CA in the embodiment of the present application may have the same subcarrier spacing (SCS) to avoid the need for resource selection enhancement scheme and automatic gain control (AGC);

[0061] Exemplarily, in the embodiment of the present application, the time domain resources of the PSFCH on each carrier of the SL CA may be aligned;

[0062] Exemplarily, the SL CA in the embodiment of the present application can reuse the design of LTE SL CA in the following aspects: SL carrier selection / reselection (carrier (re)-selection), synchronization of aggregated carriers (synchronization of aggregated carriers), power allocation for parallel sidelink transmission (Tx power split for simultaneous sidelink transmissions), and packet duplication (packet duplication);

[0063] Exemplarily, the frequency band merging work of carrier aggregation in the embodiment of the present application may be limited to intra-band contiguous CA.

[0064] The synchronization of SL CA in the embodiment of the present application can reuse the design of LTE SL CA. For ease of understanding, the following takes the traditional LTE SL CA operation as an example. Figure 2 The relevant SL CA synchronization process executed by the UE is introduced.

[0065] See also Figure 2 In step S210, a synchronization reference and a synchronization carrier frequency are determined. Step S210 can be expanded into steps S211-S215 (in Figure 2 not shown).

[0066] In step S211, a frequency set Set-A and a frequency set Set-B are determined. The frequencies in Set-A are a set of multiple frequencies configured by a high layer for carrier aggregation transmission and reception; the frequencies in Set-B are a set of multiple frequencies configured by a high layer for use in synchronizing carrier frequencies.

[0067] In step S212, the synchronization reference type and synchronization priority order are determined. Among them, all relevant frequencies are configured with the same synchronization reference type and synchronization priority order; the synchronization reference type can be one of the global navigation satellite system (GNSS), gNB / eNB and UE, which can be indicated by typeTxSync or sl-TypeTxSync; the synchronization priority order can be a synchronization priority order based on GNSS or a synchronization priority order based on gNB / eNB, which can be indicated by syncPriority or sl-SyncPriority.

[0068] In step S213, a synchronization reference is determined for all aggregated frequencies. Exemplarily, the UE may first select a frequency from multiple frequencies in Set-B as the synchronization carrier frequency, and then determine the synchronization reference corresponding to the synchronization carrier frequency. For example, the UE may determine one or more synchronization reference sources on multiple frequencies in Set-B, and then select the synchronization reference source with the highest priority as the synchronization reference. For another example, the UE may compare the sidelink synchronization signal (SLSS identity, SLSSID) carried by the sidelink synchronization signal (SLSS) on multiple frequencies in Set-B, the in-coverage indication (InCoverage) and / or the subframe occupied by the SLSS to select the frequency belonging to the highest priority group as the synchronization carrier frequency.

[0069] In step S214, the UE needs to derive the time and frequency of all aggregated carriers from the synchronization reference of the synchronization carrier frequency.

[0070] In step S215, the transmission timings on all frequencies are aligned. Specifically, all frequencies have the same direct frame number (DFN) value and the same DFN offset value.

[0071] In step S220, it is determined whether to send SLSS and PSBCH. Specifically, the information sent includes the content in SLSSID and PSBCH. Step S220 can be expanded into steps S221-S224 (in Figure 2 not shown).

[0072] In step S221, in LTE SL CA operation, after selecting the synchronization reference and the synchronization carrier frequency, the UE can determine whether to send SLSS and PSBCH according to the measurement result on the synchronization carrier frequency. If it is determined to send, the UE can send SLSS and PSBCH only on the synchronization carrier frequency or multiple frequencies selected from Set-B.

[0073] Exemplarily, the UE may determine whether to send or give up sending SLSS and PSBCH on the aggregated frequency based on the relationship between the reference signal received power (RSRP) measurement result on the synchronization carrier frequency and the threshold syncTxThreshIC or syncTxThreshOoC.

[0074] In step S222, the SLSSID is derived from the synchronization reference selected in the synchronization carrier frequency.

[0075] In step S223, the frame number (frame number, i.e. directFrameNumber) for sending SLSS and PSBCH, the subframe number (subframe number, i.e. directSubframeNumber) in the frame and the value of InCoverage are determined based on the selected synchronization reference on the selected synchronization carrier frequency.

[0076] In step S224, the transmission bandwidth configuration (ie, sl-Bandwidth), the uplink / downlink subframe configuration (UL / DL subframe configuration, ie, tdd-ConfigSL) and reserved bits are determined based on the frequency of sending SLSS and PSBCH.

[0077] Combination of the above Figure 2 The synchronization process of LTE SL CA is introduced. The SL CA in the embodiment of the present application can reuse the synchronization carrier frequency determination method in LTE SL CA.

[0078] Exemplarily, two frequency sets Set-A and Set-B are also introduced in NR SL CA. Set-A is a frequency set that is configured by a high layer and can be used for synchronization, and Set-B is a frequency set that is currently aggregated by the UE and can be used for synchronization. If Set-A is not an empty set, Set-B is a subset of the carriers in Set-A. The UE can compare the SLSSIDs carried by the SLSSs on all carriers and select the carrier with the highest priority SLSS as the synchronization carrier. Once the synchronization reference on the synchronization carrier is selected, the synchronization reference is used for the timing of all aggregated carriers.

[0079] Figure 2 In the NR system, the UE becomes a synchronization reference source by sending SLSS and PSBCH. In the NR system, the UE becomes a synchronization reference user (i.e., SyncRef UE) by sending sideline synchronization signal blocks.

[0080] It should be understood that in the embodiment of the present application, the sidelink synchronization signal block sent by the UE may represent a sidelink synchronization broadcast signal block (SL synchronization signal / PSBCH block, S-SS / PSBCH block, S-SSB), or may only represent a sidelink synchronization signal block (sidelink-synchronization signal block, S-SSB), and there is no limitation on this. Therefore, the S-SSB used to represent the synchronization signal block in this article can be replaced by the S-SS / PSBCH block.

[0081] Exemplarily, the S-SSB includes at least two of the S-PSS, S-SSS and PSBCH. For example, the S-SSB may include the S-PSS and the S-SSS. For another example, the S-SSB may not include the PSBCH.

[0082] In the traditional S-SSB design, one or more S-SSBs are sent in a fixed period (S-SSB period). An S-SSB period is, for example, 160ms, that is, 16 radio frames. The distribution of multiple S-SSBs in an S-SSB period depends on two parameters, one is the slot offset from the start of the S-SSB period to the first S-SSB, and the other is the slot interval between two consecutive S-SSBs.

[0083] For ease of understanding, the following Figure 3 The distribution of multiple S-SSBs within a fixed period is exemplified. Figure 3 In the example, the fixed period, that is, the S-SSB period, is 16 radio frames. When 16 radio frames are grouped together, each period starts at the first time slot of the current group of radio frames and ends at the first time slot of the next group of radio frames. Therefore, the system frame number (SFN) of the current group of radio frames and the next group of radio frames both meet the following condition: SFN mod 16 = 0.

[0084] Figure 3 There are 4 S-SSBs in a fixed period. The time period between the time slot where the first S-SSB is located and the start position of the fixed period is the time slot offset. Figure 3 The time period between two adjacent S-SSBs is the time slot interval.

[0085] Combination of the above Figure 3 The design of S-SSB is introduced. In the Rel-16 / 17NR SL system, there are usually two ways to trigger the UE to send S-SSB. The UE sending S-SSB can indicate that the UE becomes a SyncRef UE.

[0086] Method 1: Determine whether a UE becomes a SyncRef UE through network configuration. When the network configures a UE to become a SyncRef UE, regardless of whether the UE has data to transmit on the SL, it will send S-SSBs for other UEs to select synchronization references; when the network configures a UE as a non-SyncRef UE, the UE does not need to send S-SSBs.

[0087] Method 2: The UE decides whether to become a SyncRef UE. The UE can make the decision based on whether it is in coverage.

[0088] Exemplarily, if the UE is within the coverage of the gNB / eNB, the UE will measure the RSRP value of the serving cell. When the RSRP value is lower than a given threshold syncTxThreshIC, the UE may become a SyncRef UE and send S-SSBs; when the RSRP value is higher than or equal to the given threshold syncTxThreshIC, the UE does not send S-SSB. The RSRP-stimulated S-SSB transmission makes it more likely that UEs near the cell edge will become SyncRef UEs and send S-SSBs, thereby expanding the synchronization coverage of the serving cell. In this scenario, UEs outside the network coverage can also use the timing reference of the cell and conduct sideline communication (SL communication) with UEs in the cell.

[0089] Exemplarily, if the UE is outside the coverage of the gNB / eNB and a SyncRef UE has been selected as its synchronization reference, the UE will measure the RSRP value of the S-SSB sent by the selected SyncRef UE. When the RSRP value is lower than a given threshold syncTxThreshOoC, the UE may become a new SyncRef UE and send S-SSBs; when the RSRP value is higher than or equal to the given threshold syncTxThreshOoC, the UE does not send S-SSB. The S-SSB transmission stimulated by the RSRP of the SyncRef UE enables UEs close to the edge of the synchronization coverage to become SyncRef UEs, thereby further expanding the working range of SL communication.

[0090] The previous article introduced the mechanism of sending SLSS and PSBCH in LTE SL CA. If the sending mechanism in LTE SL CA is fully reused in NR SL CA to send S-SSB, it will cause the problem that non-synchronous carriers cannot perform SL communication. That is, after the UE selects a synchronous carrier and a synchronization reference, when the RSRP value measured on the selected synchronous carrier is high (for example, higher than or equal to a given threshold syncTxThreshIC or syncTxThreshOoC), the UE will give up sending S-SSBs on all aggregated carriers.

[0091] However, all aggregated carriers may include some carriers with poor coverage. In this scenario, the UE cannot send S-SSB on these carriers with poor coverage, which will cause the UE to be unable to perform SL communication on these carriers and unable to further expand the communication range of SL.

[0092] In summary, for NR SL, the introduction of carrier aggregation needs to consider the synchronization of carriers. Furthermore, after the introduction of carrier aggregation, the problem that non-synchronized carriers cannot perform SL communication needs to be solved in NR SL CA operation. Furthermore, after the introduction of carrier aggregation, the uneven synchronization coverage on multiple carriers of NR SL is also a technical problem that needs to be solved.

[0093] It should be understood that the synchronization problem and SL communication problem caused by the introduction of carrier aggregation in NR SL mentioned above is only an example. The embodiments of the present application can be applied to any communication system scenario where similar problems exist after the introduction of carrier aggregation.

[0094] In order to solve the above problems, an embodiment of the present application proposes a method in a first node for wireless communication. Through this method, the first node can perform measurements on multiple frequencies used for aggregation or synchronization, and determine whether to send a side synchronization signal block based on multiple measurement results. That is to say, in the SL CA operation of the first node in the embodiment of the present application, although the synchronization carrier frequency determination method of LTE SL CA is used, the S-SSB transmission mechanism stimulated by the measurement results (for example, RSRP value) is optimized, so that the SL communication range can still be expanded on frequencies with weaker synchronization coverage.

[0095] The method embodiments of the present application are described in detail below with reference to the accompanying drawings. Figure 4 A schematic flow chart of a method in a first node for wireless communication provided in an embodiment of the present application. Figure 4 The method shown includes step S410. It should be understood that Figure 4 The illustrated method may be performed by a first node.

[0096] In some implementations, the first node may be any user device for side-by-side communication as described above. For example, the first node may be a vehicle in V2X or a basic communication facility in V2X. In some implementations, the first node may be located within or outside the network coverage. When located within the network coverage, the first node may perform side-by-side communication based on the configuration of the network device.

[0097] As an embodiment, the first node may be a network-controlled repeater (NCR).

[0098] As an embodiment, the first node may be a user equipment, for example, Figure 1 User equipment 121-129 are shown.

[0099] As an embodiment, the first node may be a relay, such as a relay terminal.

[0100] See also Figure 4 In step S410, measurements are performed on all frequencies in the first frequency subset to obtain multiple measurement results. The first frequency subset belongs to the first frequency set.

[0101] As an embodiment, the frequency and the carrier or the carrier frequency are replaceable. That is, the frequency set can be replaced by the carrier set or the carrier frequency set, and the frequency subset can be replaced by the carrier subset or the carrier frequency subset.

[0102] The first frequency set is a set of multiple frequencies that the first node can perform frequency synchronization. For example, the first frequency set can be Set-A or Set-B configured by a network device or a high-level layer. As mentioned above, Set-A is a subset of multiple synchronization frequencies used for sending and receiving; Set-B is a subset of frequencies in Set-A that can be used for synchronization.

[0103] As an embodiment, the first frequency set includes multiple frequencies.

[0104] As an embodiment, the multiple frequencies in the first frequency set are all synchronous frequencies.

[0105] As an embodiment, the multiple frequencies in the first frequency set are all frequencies that can be used for synchronization.

[0106] As an embodiment, the multiple frequencies in the first frequency set are available frequencies synchronized by the first node.

[0107] In order to perform the synchronization process of multiple frequencies, the first frequency set may include a synchronization carrier frequency related to the synchronization reference. The synchronization carrier frequency may be a frequency selected by the first node for synchronization in the first frequency set, and therefore, the synchronization carrier frequency may also be referred to as a synchronization frequency.

[0108] In some embodiments, the first node may select a synchronization reference and a synchronization carrier frequency. The synchronization carrier frequency is one of a plurality of frequencies included in the first frequency set. The synchronization reference may be related to the synchronization carrier frequency. That is, the synchronization reference may be determined based on the synchronization carrier frequency selected by the first node.

[0109] As an embodiment, the synchronization carrier frequency is selected from the multiple frequencies included in the first frequency set.

[0110] In some embodiments, the synchronization carrier frequency is used for the first node to determine a synchronization reference. Exemplarily, a synchronization source on the synchronization carrier frequency is selected by the first node as the synchronization reference.

[0111] Exemplarily, the synchronization reference may be one of GNSS, base station, and SyncRefUE. GNSS and base station (gNB / eNB) are two major synchronization reference sources. SyncRefUE can become a synchronization reference source for a node by sending synchronization information (e.g., S-SSB).

[0112] As an embodiment, the synchronization carrier frequency is used to determine a synchronization reference.

[0113] As an embodiment, the synchronization reference is used to determine the synchronization carrier frequency.

[0114] As an embodiment, the synchronization source on the synchronization carrier frequency is selected as the synchronization reference. That is, the synchronization source on the synchronization carrier frequency is selected as the synchronization reference by the first node.

[0115] As an embodiment, the synchronization source monitored on the synchronization carrier frequency is selected as the synchronization reference.

[0116] In some embodiments, the first node may synchronize all frequencies by selecting a synchronization carrier frequency. For example, the first node may select a synchronization reference according to the synchronization carrier frequency, and derive the time of other synchronization frequencies according to the synchronization reference.

[0117] Exemplarily, the synchronization carrier frequency is a frequency belonging to the highest priority group in the first frequency set.

[0118] As an embodiment, the first node may compare the SLSSIDs carried by the SLSSs on multiple frequencies in the first frequency set to select a synchronization carrier frequency.

[0119] As an embodiment, the first node may compare the in-coverage indications carried by the SLSSs on multiple frequencies in the first frequency set to select the synchronization carrier frequency.

[0120] As an embodiment, the first node may compare subframes occupied by SLSSs on multiple frequencies in the first frequency set to select a synchronization carrier frequency.

[0121] Exemplarily, the synchronization carrier frequency is a frequency in the first frequency set that is more conducive to synchronization (alignment) of multiple frequencies.

[0122] The first node may determine the first frequency set in a variety of ways. In some embodiments, the first node may determine the first frequency set by interacting with the second node, or obtain a second frequency set used to determine the first frequency set. In some embodiments, the first node may determine the first frequency set according to a high-level configuration, or obtain a second frequency set used to determine the first frequency set. In some embodiments, the first node may determine the first frequency set according to a certain principle after obtaining the second frequency set. That is, the first frequency set may be determined based on the second frequency set.

[0123] In some embodiments, the second frequency set includes the first frequency set. Exemplarily, the first frequency set may be a subset of the second frequency set. For example, the first frequency set is Set-B and the second frequency set is Set-A. For another example, the first frequency set may be composed of one or more frequencies selected by the first node from the second frequency set.

[0124] As an embodiment, the second frequency set includes multiple frequencies.

[0125] As an embodiment, the multiple frequencies in the second frequency set include the multiple frequencies in the first frequency set.

[0126] As an embodiment, at least one frequency in the second frequency set does not belong to the first frequency set.

[0127] As an embodiment, the first frequency set is determined by the first node itself from the second frequency set.

[0128] As an embodiment, the first frequency set is determined from the second frequency set.

[0129] In some embodiments, the second frequency set is the same as the first frequency set. For example, the first frequency set and the second frequency set are both Set-A.

[0130] The second frequency set may be configured by a higher layer, or may be configured by a network, a cell, or a base station, which is not limited here.

[0131] As an embodiment, the second frequency set is configured by a higher layer.

[0132] As an embodiment, the second frequency set is configured by radio resource control (RRC) layer signaling. For example, the second frequency set may be sent layer by layer from the RRC layer corresponding to the first node to the physical layer.

[0133] As an embodiment, the first frequency set is configured by a higher layer.

[0134] As can be seen from the foregoing, the first node can obtain the second frequency set through interaction with the second node, thereby determining the first frequency set. The second node can be any network device described above, or other communication device that indicates the second frequency set to the first node.

[0135] As an embodiment, the second node is a base station.

[0136] For ease of understanding, the following Figure 5 , an implementation manner in which the first node determines the first frequency set is exemplarily described. Figure 5 The method in the second node for wireless communication proposed in the embodiment of the present application is introduced from the perspective of interaction between the first node and the second node. Figure 5 for Figure 4 A possible implementation, for simplicity, Figure 4 The terms that have been explained in will not be repeated.

[0137] See also Figure 5 In step S510, the second node sends first information to the first node, wherein the first information includes a second frequency set. That is, the second node sends the second frequency set to the first node.

[0138] In step S520, the first node determines a first frequency set including a first frequency subset according to the second frequency set.

[0139] Depend on Figure 5 It can be known that the network device can configure the second frequency set for the first node so as to facilitate frequency aggregation of the first node.

[0140] Continue to see Figure 4 In step S410, the first frequency subset belongs to the first frequency set. Exemplarily, the first frequency subset is a subset of the first frequency set. That is, the first frequency subset may be a set consisting of one or more frequencies in the first frequency set.

[0141] As an embodiment, the first frequency subset includes multiple frequencies.

[0142] As an embodiment, the first frequency set includes the first frequency subset.

[0143] As an embodiment, the multiple frequencies included in the first frequency subset are respectively the multiple frequencies included in the first frequency set.

[0144] In some embodiments, the first frequency subset does not include the synchronization carrier frequency used for synchronization in the first frequency set, and the first node does not measure the synchronization carrier frequency. In this scenario, the first node can pay more attention to the frequency with lower priority when measuring the frequencies in the first frequency subset. In some embodiments, the first frequency subset includes the synchronization carrier frequency used for synchronization in the first frequency set.

[0145] In some embodiments, the first frequency subset may include a synchronization carrier frequency in the first frequency set used for synchronization, and a measurement result of the first node on the synchronization carrier frequency will be used to determine whether to send a sideline synchronization signal.

[0146] In some embodiments, the synchronization reference is used for all frequencies in the second frequency set. Exemplarily, after the first node determines the synchronization reference according to the synchronization carrier frequency, the time of all synchronization frequencies in the second carrier set can be derived according to the synchronization reference. Exemplarily, the first node can perform subsequent measurements according to the determined synchronization reference.

[0147] As an embodiment, the synchronization reference is used for time-frequency synchronization of all frequencies in the second frequency set.

[0148] As an embodiment, the synchronization reference is used for transmission timing on all frequencies in the second frequency set.

[0149] As an embodiment, the synchronization reference is used for reception timing on all frequencies in the second frequency set.

[0150] As an embodiment, the synchronization reference is used for all frequencies in the first frequency set. For example, the synchronization reference determined by the first node is used to measure all frequencies in Set-B.

[0151] As an embodiment, the synchronization reference is used for time-frequency synchronization of all frequencies in the first frequency set.

[0152] As an embodiment, the synchronization reference is used for transmission timing on all frequencies in the first frequency set.

[0153] As an embodiment, the synchronization reference is used for reception timing on all frequencies in the first frequency set.

[0154] In some embodiments, all frequencies in the first frequency subset may be frequencies with the same characteristics, so that the first node can select a frequency in the first frequency subset in the first frequency set. That is, the first node can select one or more frequencies belonging to the first frequency subset from the first frequency set according to certain characteristics. Exemplarily, the common characteristics of all frequencies in the first frequency subset can be used to distinguish frequencies in the first frequency set. Exemplarily, the first node is in coverage on the first frequency subset, or the first node is not in coverage on the first frequency subset. Among them, not being in coverage can also be referred to as being out of coverage.

[0155] As an embodiment, the first node being within coverage on a frequency may be replaced by the first node detecting a reference signal on the frequency or the detected signal being reliable. In contrast, the first node being not within coverage on a frequency means that the first node does not detect a reference signal or a reliable signal on the frequency.

[0156] As an embodiment, the first node is within the coverage in frequency, and alternatively, the first node can perform time or frequency synchronization according to the synchronization source in frequency. In contrast, the first node is not within the coverage in frequency, which means that the first node cannot perform frequency synchronization.

[0157] Exemplarily, the first node is within the coverage of the synchronization reference on the first frequency subset, or the first node is not within the coverage of the synchronization reference on the first frequency subset.

[0158] As an embodiment, the first node being in the coverage associated with the synchronization reference on the frequency may be replaced by the first node detecting a signal associated with the synchronization reference on the frequency. In contrast, the first node not being in the coverage associated with the synchronization reference on the frequency means that the first node does not detect a signal associated with the synchronization reference on the frequency.

[0159] As an embodiment, the signal related to the synchronization reference may be a reference signal or other signal used for the first node to synchronize with the synchronization reference. The signal related to the synchronization reference may also be a related signal sent by the synchronization reference. For example, when the synchronization reference is GNSS, the signal related to the synchronization reference is a reliable GNSS signal.

[0160] As an embodiment, the signal sent by the synchronization reference may be a downlink signal. For example, when the synchronization reference determined by the synchronization carrier frequency is a gNB / eNB, the signal related to the synchronization reference is a downlink reference signal sent by the gNB / eNB.

[0161] As an embodiment, the signal sent by the synchronization reference may be a sidelink signal. For example, when the synchronization reference is SyncRef UE, the signal related to the synchronization reference is S-SSB.

[0162] As an embodiment, the first node being within coverage on the first frequency subset means that the first node is within coverage related to the synchronization reference on all frequencies in the first frequency subset.

[0163] As an embodiment, the first node is not in coverage on the first frequency subset means that the first node is not in coverage related to the synchronization reference on all frequencies in the first frequency subset.

[0164] Exemplarily, all frequencies in the first frequency subset are multiple frequencies in the first frequency set that satisfy the first condition. When the first node performs measurements on multiple frequencies that satisfy the first condition, the values ​​of the multiple measurement results are relatively close, which can facilitate the first node to perform calculations or comparisons based on the measurement results of the multiple frequencies, and also facilitate determining relevant thresholds.

[0165] As an implementation manner, the first condition may be that the first node is within the coverage in terms of frequency, or that the first node is not within the coverage in terms of frequency.

[0166] As an embodiment, the first node is within coverage at a frequency that meets the first condition, which can facilitate the first node to perform measurement at the frequency and the value of the measurement result is relatively high.

[0167] As an embodiment, the first node is not in coverage at a frequency that satisfies the first condition, which may facilitate the first node to perform measurement at the frequency and the value of the measurement result is relatively low.

[0168] As another implementation manner, the first condition may be that the first node is in the coverage of the synchronization reference in terms of frequency, or that the first node is not in the coverage of the synchronization reference in terms of frequency.

[0169] As an embodiment, the first node is within the coverage of the synchronization reference correlation at a frequency that satisfies the first condition.

[0170] As an embodiment, the first node is outside the coverage of the synchronization reference at a frequency that satisfies the first condition.

[0171] In some embodiments, the first node is in coverage on the first frequency subset, or the first node is not in coverage on the first frequency subset, which can facilitate comparison of multiple measurement results. If the first node is in coverage on some frequencies of the first frequency subset and not in coverage on some frequencies, the RSRP value obtained after the first node performs measurement will have a large difference, and subsequent calculations cannot be performed.

[0172] In some embodiments, all frequencies in the first frequency subset may also be frequencies with different characteristics, so that the first node can determine on which frequencies to send the sideline synchronization signal blocks.

[0173] As an embodiment, when the first frequency subset is the same as the first frequency set, the first node may measure all frequencies in the first frequency set to determine frequencies with weaker coverage in the first frequency set. The first node may send S-SSBs on these frequencies with weaker coverage to balance the synchronous coverage of multiple frequencies.

[0174] As an embodiment, the first frequency subset may be a representative set of multiple types of frequencies in the first frequency set to reduce measurement requirements and power consumption. For example, multiple frequencies in the first frequency set may be classified, and the first frequency subset may include at least one frequency of all types or some types.

[0175] In some embodiments, the first frequency subset belongs to the first frequency set, and may also include that the frequencies in the first frequency subset are the same as the frequencies in the first frequency set.

[0176] As an embodiment, the first frequency subset is the same as the first frequency set.

[0177] In some embodiments, the first frequency subset belongs to a first frequency set, which is also represented as the first frequency subset being determined from the first frequency set. Exemplarily, the first node determines the first frequency subset according to the first frequency set.

[0178] In some embodiments, the first frequency subset may include one frequency in the first frequency set, or may include multiple frequencies in the first frequency set.

[0179] As an embodiment, any frequency in the first frequency subset is a frequency in the first frequency set.

[0180] As an embodiment, at least one frequency in the first frequency set is different from any frequency in the first frequency subset.

[0181] The first frequency subset may be determined by the first node itself, or may be configured by the network or the base station.

[0182] As an embodiment, the first frequency subset is determined by the first node itself from the first frequency set.

[0183] As an embodiment, the first frequency subset is configured by a higher layer.

[0184] As an embodiment, the higher layer includes various higher layers relative to the physical layer. For example, the higher layer is the RRC layer.

[0185] Continue to see Figure 4 After determining the first frequency subset, the first node will measure all frequencies in the first frequency subset respectively to determine whether to send a side synchronization signal block (S-SSB(s)) on one or more frequencies in the first frequency set. The first node can obtain multiple measurement results through multiple measurements.

[0186] The one or more frequencies in the first frequency set may be any one or more frequencies in the first frequency set. By sending S-SSB(s) on the one or more frequencies, the SL communication range may be expanded and the communication efficiency may be improved.

[0187] As an embodiment, a frequency in the first frequency set may be a synchronous carrier frequency or may not be a synchronous carrier frequency.

[0188] As an embodiment, the multiple frequencies of the first frequency set may be the first frequency subset or some frequencies in the first frequency subset, or may not include the frequencies in the first frequency subset.

[0189] The first node measures all frequencies in the first frequency subset respectively, including the first node performing multiple measurements on multiple frequencies in the first frequency subset according to the selected synchronization reference. Through multiple measurements, the first node considers some frequencies with relatively weak coverage when determining whether to send S-SSB(s), balances synchronization coverage, and expands synchronization coverage.

[0190] In some embodiments, the first node performs measurements on all frequencies in the first frequency subset based on the same synchronization reference. When these frequencies are measured based on the same synchronization reference, it is convenient for the first node to compare measurement results and coverage ranges of different frequencies.

[0191] As an embodiment, performing measurements on all frequencies in the first frequency subset respectively is performing measurements on all frequencies in the first frequency subset respectively with respect to the same synchronization reference.

[0192] As an embodiment, any measurement result among the multiple measurement results is a measurement result for the same synchronization reference.

[0193] As an embodiment, when measurements are performed on all frequencies in the first frequency subset respectively, the synchronization references targeted are all synchronization references selected on the synchronization carrier frequency.

[0194] In some embodiments, the first node monitors and measures the relevant signal on the frequency according to the synchronization reference. Exemplarily, the first node measures the RSRP value of the relevant signal sent by the synchronization reference on the frequency.

[0195] In some embodiments, the multiple measurement results are values ​​of the synchronization reference measured by the first node on multiple frequencies. After determining the synchronization reference, the first node can measure all frequencies in the first frequency subset according to the synchronization reference. For example, multiple RSRP values ​​based on the synchronization reference are measured on all frequencies in Set-B or Set-A.

[0196] Exemplarily, for a determined synchronization reference, the multiple measurement results are multiple measurement results based on the synchronization reference. Taking RSRP value as an example, the multiple measurement results are multiple RSRP values ​​based on the synchronization reference.

[0197] As an embodiment, the multiple measurement results are multiple RSRP values ​​for the synchronization reference respectively.

[0198] As an embodiment, the multiple RSRP values ​​are respectively multiple RSRP values ​​of a reference cell.

[0199] As an embodiment, the multiple RSRP values ​​are multiple RSRP values ​​of the reference cell measured at multiple frequencies.

[0200] As an embodiment, the multiple RSRP values ​​are respectively multiple S-RSRP (sidelink RSRP) values.

[0201] As an embodiment, the multiple RSRP values ​​are respectively multiple S-RSRP values ​​of SyncRefUE.

[0202] As an embodiment, the multiple RSRP values ​​are multiple S-RSRP values ​​of SyncRefUE measured at multiple frequencies respectively.

[0203] In some embodiments, the multiple measurement results correspond to all frequencies in the first frequency subset. That is, the first node measures all frequencies in the first frequency subset respectively to obtain the corresponding multiple measurement results.

[0204] As an embodiment, the multiple measurement results correspond one-to-one to all the frequencies in the first frequency subset. For example, when there are 10 frequencies in the first frequency subset, 10 measurement results can be obtained through measurement.

[0205] In some embodiments, the multiple measurement results are parameter values ​​of the same type, so that the first node can compare the coverage of multiple frequencies through the multiple measurement results. For example, the multiple measurement results are multiple RSRP values.

[0206] In some embodiments, the measurement result may be any parameter that can represent the signal quality, which is not limited here. For example, the measurement result may be an RSRP value, which can be determined by measuring the received power of the signal. For another example, the measurement result may be a reference signal received quality (RSRQ). For another example, the measurement result may be a received signal strength indication (RSSI). For another example, the measurement result may be a signal to interference plus noise ratio (SINR).

[0207] For ease of understanding, the following takes multiple measurement results as an example, each of which is a multiple RSRP value. Figure 6 right Figure 4 A possible implementation of the method is exemplarily described. Figure 6 The horizontal axis in represents the frequency, and the vertical axis represents multiple RSRP values ​​obtained by respectively measuring the first node at multiple frequencies.

[0208] See also Figure 6 , the first frequency subset includes N frequencies, namely frequency 1, frequency 2, ..., frequency N. N is a positive integer. Wherein, frequency k is any frequency in the first frequency subset, 1≤k≤N. Figure 6 As shown, the first node measures N frequencies in the first frequency subset respectively, and can obtain N RSRP values. Figure 6 The multiple RSRP values ​​obtained by measuring respectively on the N frequencies are shown to be different. It should be understood that the results of the first node measuring respectively on all frequencies of the first frequency subset may also be partially the same.

[0209] exist Figure 6 In the embodiment, the first node selects frequency k as the synchronization carrier frequency. The measurement results of the first node on other frequencies are RSRP values ​​for the synchronization reference selected on frequency k. Figure 6The result of the measurement performed by the first node at frequency k may be the maximum value measured at the N frequencies, or may not be the maximum value.

[0210] It should be understood that Figure 6 The selection of frequency k in the first frequency subset as the synchronization carrier frequency is only an illustration. In some embodiments, the synchronization carrier frequency may not be any frequency in the first frequency subset.

[0211] In some embodiments, multiple measurement results are used to determine whether to send a sideline synchronization signal block on one or more frequencies in the first set of frequencies.

[0212] Exemplarily, a plurality of measurement results are used to determine a first parameter, which is used to determine whether to send a sideline synchronization signal block on one or more frequencies in a first frequency set.

[0213] As a possible implementation, the first parameter may be a parameter of the same type as the measurement result, or may be a parameter of a different type obtained by converting multiple measurement results. For example, when the multiple measurement results are multiple RSRP values, the first parameter may be the first RSRP value.

[0214] As a possible implementation, the first parameter may be one of a plurality of parameters related to the plurality of measurement results. For example, the first parameter may be one of the following four: an average value of the plurality of measurement results; a minimum value among the plurality of measurement results; a maximum value among the plurality of measurement results; or a measurement result at a first position among the plurality of measurement results.

[0215] As a possible implementation manner, the first parameter may also be determined according to some of the multiple measurement results, which will not be described in detail here.

[0216] As an embodiment, the first parameter is an average value of multiple measurement results. For example, the first node can obtain an average value of multiple measurement results after measuring on multiple carriers. For another example, the first parameter is a linear average of multiple RSRP values.

[0217] As an embodiment, the first parameter is a minimum value of multiple measurement results to ensure SL communication covering the weaker carrier. For example, the first parameter is a minimum value of multiple RSRPs.

[0218] As an embodiment, the first parameter is a maximum value of the plurality of measurement results.

[0219] As an embodiment, the first parameter is a measurement result at a first position among the multiple measurement results. After the multiple measurement results are sorted according to a certain rule, the first parameter may be a value at the first position.

[0220] As an embodiment, the first position is configured at a higher level.

[0221] As an embodiment, the first position is configured by RRC layer signaling.

[0222] As an embodiment, the first location is configured by a base station, a network or a cell.

[0223] As an embodiment, the values ​​of the multiple measurement results are arranged in descending order, or the values ​​of the multiple measurement results are arranged in ascending order. For example, the first parameter is the Xth value (X is a positive integer) of the multiple RSRP values, and the multiple RSRP values ​​are arranged in order from small to large or from large to small.

[0224] As an embodiment, the first parameter includes multiple measurement results. That is, the first parameter is multiple measurement results or part of the multiple measurement results. The multiple measurement results may include a first measurement result, and the first measurement result is any measurement result of the multiple measurement results. The first parameter may be one or more first measurement results.

[0225] As an embodiment, the first measurement result is a result obtained by the first node performing measurement at a frequency corresponding to the first measurement result.

[0226] The above describes how to determine the first parameter. In the present application, the first parameter and the first threshold are used to determine whether to send a sideline synchronization signal block on one or more frequencies in the first frequency set.

[0227] The first threshold may be a given parameter for determining whether to send a side synchronization signal block. In some embodiments, the value of the first threshold is related to multiple measurement results. For example, when the multiple measurement results are multiple RSRP values, the first threshold may be compared with the multiple RSRP values ​​respectively.

[0228] The first threshold may be configured by a higher layer, or may be configured by a network, a cell, or a base station, or may be determined by the first node according to actual communication conditions.

[0229] In some embodiments, the first threshold value may be determined based on whether the first node is in coverage. Exemplarily, the first node may determine whether the first node is in coverage based on the S-SSB sent by the synchronization reference, thereby determining the first threshold value. For example, if the first node is in coverage, the first threshold value is a first candidate threshold value; if the first node is out of coverage, the first threshold value is a second candidate threshold value.

[0230] Exemplarily, the first threshold is a first candidate threshold or a second candidate threshold, and whether the first node is within coverage on the first frequency subset is used to determine the first threshold.

[0231] As an embodiment, when the first node is within coverage on the first frequency subset, the first threshold is a first candidate threshold; when the first node is not within coverage on the first frequency set, the first threshold is a second candidate threshold. As described above, the first node is within coverage on the first frequency subset, which means that the first node is within coverage associated with the synchronization reference on all frequencies of the first frequency subset. Correspondingly, the first node is not within coverage on the first frequency set, which means that the first node is not within coverage associated with the synchronization reference on all frequencies of the first frequency subset.

[0232] The first node may obtain the first candidate threshold and the second candidate threshold in a variety of ways. In some embodiments, the first node may obtain the first candidate threshold and the second candidate threshold by interacting with the second node. In some embodiments, the first node may obtain the first candidate threshold and the second candidate threshold according to a higher layer configuration.

[0233] Exemplarily, the second node may send second information including the first candidate threshold and the second candidate threshold to the first node. The second information and whether the first node is in coverage on the first frequency subset are used together to determine the first threshold.

[0234] In some embodiments, the magnitude relationship between the first parameter and the first threshold is used to determine whether to send a side synchronization signal block on one or more frequencies in the first frequency set. Exemplarily, when the first parameter is lower than the first threshold, S-SSBs are sent on one or more frequencies in the first frequency set; when the first parameter is not lower than the first threshold, S-SSBs are abandoned on one or more frequencies in the first frequency set.

[0235] For ease of understanding, the following Figure 7 An implementation method for determining whether to send a sideline synchronization signal is exemplified. Figure 7 The steps in can be Figure 4 The process follows the steps shown. Figure 7 Executed by the first node.

[0236] See also Figure 7 In step S710, it is determined whether the first parameter is lower than a first threshold. Figure 4 The multiple measurement results obtained in step S410 are determined. If the first parameter is lower than the first threshold, step S720 is executed; if the first parameter is not lower than the first threshold, step S730 is executed.

[0237] In step S720, a sideline synchronization signal block is transmitted on one or more frequencies in the first frequency set.

[0238] In step S730, the transmission of the side synchronization signal block on one or more frequencies in the first frequency set is abandoned.

[0239] As an embodiment, the first parameter is an average value of multiple measurement results, and whether to send S-SSBs is determined based on the relationship between the average value and the first threshold, thereby balancing the synchronization coverage of multiple frequencies. For example, the first node can determine whether to send S-SSBs on all frequencies based on the synchronization reference selected on the selected frequency (synchronous carrier frequency), the average RSRP value measured on multiple frequencies and the relationship between the first threshold.

[0240] As an embodiment, the first parameter is the minimum value of multiple measurement results, and whether to send S-SSBs is determined based on the relationship between the minimum value and the first threshold, thereby ensuring SL communication on a frequency with weaker coverage.

[0241] For example, the first node can measure the RSRP value of the synchronization reference on all frequencies in Set-B according to the synchronization reference selected on the synchronization carrier frequency, and determine whether to send S-SSBs on all frequencies based on the relationship between the minimum RSRP value and the first threshold.

[0242] For example, the first node can measure the RSRP value of the synchronization reference on all frequencies in Set-A based on the synchronization reference selected on the synchronization carrier frequency, and determine whether to send S-SSBs on all frequencies based on the relationship between the minimum RSRP value and the first threshold.

[0243] As an embodiment, the first parameter is a measurement result at a first position among multiple measurement results, and whether to send S-SSBs is determined based on a relationship between the measurement result at the first position and a first threshold. In a scenario where the first position can be dynamically adjusted, the first node can adjust the synchronization coverage of multiple frequencies according to actual conditions.

[0244] For example, the first node may measure the RSRP value of the synchronization reference on all frequencies in Set-B according to the synchronization reference selected on the synchronization carrier frequency. After arranging these RSRP values ​​in ascending order, the relationship between the RSRP value of the Xth frequency except the first frequency and the first threshold value may determine whether to send S-SSBs on all frequencies.

[0245] As an embodiment, when the first parameter is one or more first measurement results, the magnitude relationship between the first measurement result and the first threshold is used to determine whether to send a side synchronization signal block at the frequency corresponding to the first measurement result.

[0246] For example, when the first measurement result is lower than the first threshold, the side line synchronization signal block is sent at the frequency corresponding to the first measurement result; when the first measurement result is not lower than the first threshold, the sending of the side line synchronization signal block at the frequency corresponding to the first measurement result is abandoned.

[0247] For ease of understanding, the following Figure 8 Another implementation manner of determining whether to send a sideline synchronization signal is exemplified. Figure 8 The steps in can be Figure 4 The process follows the steps shown. Figure 8 It can be executed by the first node.

[0248] See also Figure 8 In step S810, it is determined whether the first measurement result is lower than a first threshold. The first measurement result is Figure 4 One of the multiple measurement results obtained in step S410 is shown. If the first measurement result is lower than the first threshold, step S820 is executed; if the first measurement result is not lower than the first threshold, step S830 is executed.

[0249] In step S820, a sideline synchronization signal block is sent at a frequency corresponding to the first measurement result.

[0250] In step S830, the sending side line synchronization signal block is abandoned at the frequency corresponding to the first measurement result.

[0251] As an embodiment, the magnitude relationship between each of the multiple measurement results and the first threshold is used to determine whether to send a side synchronization signal block at the frequency corresponding to each of the multiple measurement results. For example, the first node sends S-SSBs at the frequency corresponding to the measurement result lower than the first threshold among the multiple measurement results, and abandons sending S-SSBs at the frequency corresponding to the measurement result not lower than the first threshold among the multiple measurement results.

[0252] The following is a specific example Fig. 9 , describes the embodiments of the present application in more detail. It should be noted that Figures 4 to 8 The examples are only intended to help those skilled in the art understand the embodiments of the present application, and are not intended to limit the embodiments of the present application to the specific values ​​or specific scenarios illustrated. Figures 4 to 8 It is obvious that various equivalent modifications or changes can be made, and such modifications or changes also fall within the scope of the embodiments of the present application.

[0253] Fig. 9 Taking the NR SL CA synchronization process executed by the UE as an example, an embodiment of the method of the present application is introduced.

[0254] See also Fig. 9In step S910, a synchronization reference and a synchronization carrier frequency are determined. Step S910 can be expanded into steps S911-S915 (in Fig. 9 (not shown). Among them, steps S911 to S915 are Figure 2 The process from step S211 to step S215 in FIG. 1 is the same and will not be described in detail here. However, the frequency alignment information in step S915 is different from that in step S215.

[0255] In step S915, the transmission timings on all frequencies are aligned. Specifically, all frequencies have the same S-SSB period, the same SFN value, the same slot offset value, the same slot interval value, and the same number of S-SSBs. The meaning of the above parameters that need to be aligned can be found in Figure 3 .

[0256] In step S920, it is determined whether to send S-SSBs on one or more frequencies in the first frequency set based on the multiple measurement results. The first frequency set may be Set-B or Set-A as described above. The first frequency set includes a first frequency subset. One or more frequencies in the first frequency set may be synchronization carrier frequencies, or all frequencies in the first frequency subset, or all frequencies in the first frequency set. Step S920 may be expanded into steps S921-S926 (in Fig. 9 (not shown). Among them, step S924 and Figure 2 The same as step S222 in , which will not be repeated here.

[0257] In step S921, multiple RSRP values ​​(multiple measurement results) based on the synchronization reference are measured on all carriers in the first frequency subset to determine a first RSRP value. The first RSRP value is a first parameter.

[0258] In step S922, whether the UE is within coverage is determined based on the S-SSB sent by the synchronization reference, thereby determining the first threshold.

[0259] In step S923, the magnitude relationship between the first RSRP value and the first threshold is used to determine whether the UE sends S-SSBs on one or more frequencies in the first frequency set. When the first RSRP value is lower than the first threshold, the UE sends S-SSBs on one or more frequencies in the first frequency set; when the first RSRP value is higher than or equal to the first threshold, the UE abandons sending S-SSBs on one or more frequencies in the first frequency set.

[0260] In step S925, the time domain resources (sl-SSB-TimeAllocation) for sending S-SSB and the value within the coverage are determined based on the synchronization reference selected on the selected synchronization carrier frequency.

[0261] In step S926, the transmission bandwidth configuration, uplink / downlink subframe configuration and reserved bits are determined based on the frequency of sending the S-SSB.

[0262] contrast Fig. 9 and Figure 2 It can be seen that the embodiment of the present application optimizes the S-SSB sending mechanism based on RSRP excitation on the basis of continuing to use the relevant synchronization carrier frequency determination method, so that the SL communication range can still be expanded at frequencies with weaker synchronization coverage, effectively solving the problem of unbalanced multi-frequency synchronization coverage.

[0263] Combination of the above Figures 1 to 9 , describes the method embodiment of the present application in detail, and the following is combined with Figures 10 to 13 , describes the device embodiment of the present application in detail. It should be understood that the description of the method embodiment corresponds to the description of the device embodiment, so the parts not described in detail can refer to the previous method embodiment.

[0264] Fig.10 A first node for wireless communication provided in an embodiment of the present application. Fig.10 As shown, the first node 1000 includes a processor 1010 .

[0265] Processor 1010 can be used to perform measurements on all frequencies in the first frequency subset respectively to obtain multiple measurement results; wherein, a first parameter and a first threshold are used to determine whether to send a side synchronization signal block on one or more frequencies in the first frequency set, and the multiple measurement results are used to determine the first parameter, and the first frequency subset belongs to the first frequency set.

[0266] As an embodiment, the size relationship between the first parameter and the first threshold is used to determine whether to send a side synchronization signal block on one or more frequencies in the first frequency set, and the first parameter is one of the following four: an average value of the multiple measurement results; a minimum value among the multiple measurement results; a maximum value among the multiple measurement results; a measurement result in the first position among the multiple measurement results, and the values ​​of the multiple measurement results are arranged in descending order, or the values ​​of the multiple measurement results are arranged in ascending order.

[0267] As an embodiment, the first node 1000 also includes a first transmitter, which can be used to send side synchronization signal blocks on one or more frequencies in the first frequency set when the first parameter is lower than the first threshold; and to abandon sending side synchronization signal blocks on one or more frequencies in the first frequency set when the first parameter is not lower than the first threshold.

[0268] As an embodiment, the first parameter includes the multiple measurement results, the first measurement result is included in the multiple measurement results, and the size relationship between the first measurement result and the first threshold is used to determine whether to send a side synchronization signal block at the frequency corresponding to the first measurement result.

[0269] As an embodiment, the first node 1000 also includes a second transmitter, which can be used to send a side synchronization signal block at the frequency corresponding to the first measurement result when the first measurement result is lower than the first threshold; when the first measurement result is not lower than the first threshold, to abandon sending the side synchronization signal block at the frequency corresponding to the first measurement result.

[0270] As an embodiment, the processor is also used to select a synchronization reference and a synchronization carrier frequency, wherein the synchronization carrier frequency is one of multiple frequencies included in the first frequency set; the synchronization reference is related to the synchronization carrier frequency; the first frequency subset does not include the synchronization carrier frequency, or the first frequency subset includes the synchronization carrier frequency.

[0271] As an embodiment, the synchronization reference is used for all frequencies in a second frequency set, and the second frequency set includes the first frequency set.

[0272] As an embodiment, the first node is within the coverage of the synchronization reference at all frequencies in the first frequency subset, or the first node is not within the coverage of the synchronization reference at all frequencies in the first frequency subset.

[0273] As an embodiment, the first threshold is a first candidate threshold or a second candidate threshold, and whether the first node is within coverage on the first frequency subset is used to determine the first threshold.

[0274] As an embodiment, when the first node is within coverage on the first frequency subset, the first threshold is the first candidate threshold; when the first node is not within coverage on the first frequency set, the first threshold is the second candidate threshold.

[0275] As an embodiment, the multiple measurement results are multiple RSRP values ​​respectively.

[0276] As an embodiment, the processor 1010 may be the processor 1210. The first node 1000 may further include a transceiver 1230 and a memory 1220, as shown in FIG. Fig.12 shown.

[0277] Fig.11 A second node for wireless communication provided in an embodiment of the present application. Fig.11 As shown, the second node 1100 includes a third transmitter 1110 .

[0278] The third transmitter 1110 can be used to send first information, where the first information includes a second frequency set, and the second frequency set is used by the first node to determine a first frequency set, and the first frequency set includes a first frequency subset; wherein a first parameter and a first threshold are used by the first node to determine whether to send a side synchronization signal block on one or more frequencies in the first frequency set, and the first parameter is determined based on multiple measurement results, and the multiple measurement results are obtained by measurements performed by the first node on all frequencies in the first frequency subset.

[0279] As an embodiment, the relationship between the first parameter and the first threshold is used by the first node to determine whether to send a side synchronization signal block on one or more frequencies in the first frequency set, and the first parameter is one of the following four: an average value of the multiple measurement results; a minimum value among the multiple measurement results; a maximum value among the multiple measurement results; a measurement result in the first position among the multiple measurement results, and the values ​​of the multiple measurement results are arranged in descending order, or the values ​​of the multiple measurement results are arranged in ascending order.

[0280] As an embodiment, the first parameter includes the multiple measurement results, the first measurement result is one of the multiple measurement results, and the size relationship between the first measurement result and the first threshold is used by the first node to determine whether to send a side synchronization signal block at the frequency corresponding to the first measurement result.

[0281] As an embodiment, the first frequency set includes a synchronization carrier frequency, and a synchronization source on the synchronization carrier frequency is selected by the first node as a synchronization reference; the first frequency subset does not include the synchronization carrier frequency, or the first frequency subset includes the synchronization carrier frequency.

[0282] As an embodiment, the synchronization reference is used for all frequencies in the second frequency set, and the second frequency set includes the first frequency set.

[0283] As an embodiment, the first node is within the coverage of the synchronization reference at all frequencies in the first frequency subset, or the first node is not within the coverage of the synchronization reference at all frequencies in the first frequency subset.

[0284] As an embodiment, the second node 1100 also includes a fourth transmitter, which can be used to send second information, and the second information includes a first candidate threshold and a second candidate threshold; wherein the first threshold is the first candidate threshold or the second candidate threshold, and whether the first node is within coverage on the first frequency subset is used to determine the first threshold.

[0285] As an embodiment, when the first node is within coverage on the first frequency subset, the first threshold is the first candidate threshold; when the first node is not within coverage on the first frequency set, the first threshold is the second candidate threshold.

[0286] As an embodiment, the multiple measurement results are multiple RSRP values ​​respectively.

[0287] The third transmitter 1110 may be a transceiver 1230. The second node 1100 may further include a processor 1210 and a memory 1220. Fig.12 shown.

[0288] Fig.12 It is a schematic structural diagram of a communication device according to an embodiment of the present application. Fig.12 The dotted line in the figure indicates that the unit or module is optional. The device 1200 can be used to implement the method described in the above method embodiment. The device 1200 can be a chip, a user equipment or a network device.

[0289] The device 1200 may include one or more processors 1210. The processor 1210 may support the device 1200 to implement the method described in the method embodiment above. The processor 1210 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0290] The apparatus 1200 may further include one or more memories 1220. The memory 1220 stores a program, which can be executed by the processor 1210, so that the processor 1210 executes the method described in the above method embodiment. The memory 1220 may be independent of the processor 1210 or integrated in the processor 1210.

[0291] The apparatus 1200 may further include a transceiver 1230. The processor 1210 may communicate with other devices or chips through the transceiver 1230. For example, the processor 1210 may transmit and receive data with other devices or chips through the transceiver 1230.

[0292] Fig.13 A schematic diagram of the hardware modules of a communication device provided in an embodiment of the present application. Specifically, Fig.13 A block diagram is shown of a first communication device 1350 and a second communication device 1310 communicating with each other in an access network.

[0293] The first communication device 1350 includes a controller / processor 1359, a memory 1360, a data source 1367, a transmit processor 1368, a receive processor 1356, a multi-antenna transmit processor 1357, a multi-antenna receive processor 1358, a transmitter / receiver 1354 and an antenna 1352.

[0294] The second communication device 1310 includes a controller / processor 1375, a memory 1376, a data source 1377, a receive processor 1370, a transmit processor 1316, a multi-antenna receive processor 1372, a multi-antenna transmit processor 1371, a transmitter / receiver 1318 and an antenna 1320.

[0295] In the transmission from the second communication device 1310 to the first communication device 1350, at the second communication device 1310, the upper layer data packets from the core network or the upper layer data packets from the data source 1377 are provided to the controller / processor 1375. The core network and the data source 1377 represent all the protocol layers above the L2 layer. The controller / processor 1375 implements the functionality of the L2 layer. In the transmission from the second communication device 1310 to the first communication device 1350, the controller / processor 1375 provides header compression, encryption, packet segmentation and reordering, multiplexing between logical and transport channels, and allocation of radio resources to the first communication device 1350 based on various priority metrics. The controller / processor 1375 is also responsible for the retransmission of lost packets and signaling to the first communication device 1350. The transmit processor 1316 and the multi-antenna transmit processor 1371 implement various signal processing functions for the L1 layer (i.e., the physical layer). The transmit processor 1316 implements coding and interleaving to facilitate forward error correction at the second communication device 1310, as well as mapping of signal constellations based on various modulation schemes (e.g., binary phase shift keying, quadrature phase shift keying, M phase shift keying, M quadrature amplitude modulation). The multi-antenna transmit processor 1371 performs digital spatial precoding, including codebook-based precoding and non-codebook-based precoding, and beamforming processing on the coded and modulated symbols to generate one or more spatial streams. The transmit processor 1316 then maps each spatial stream to a subcarrier, multiplexes with a reference signal (e.g., a pilot) in the time domain and / or frequency domain, and then uses an inverse fast Fourier transform to generate a physical channel carrying a time domain multi-carrier symbol stream. The multi-antenna transmit processor 1371 then performs a transmit analog precoding / beamforming operation on the time domain multi-carrier symbol stream. Each transmitter 1318 converts the baseband multi-carrier symbol stream provided by the multi-antenna transmit processor 1371 into a radio frequency stream, and then provides it to a different antenna 1320.

[0296] In the transmission from the second communication device 1310 to the first communication device 1350, at the first communication device 1350, each receiver 1354 receives a signal through its corresponding antenna 1352. Each receiver 1354 recovers the information modulated onto the RF carrier and converts the RF stream into a baseband multi-carrier symbol stream and provides it to the receiving processor 1356. The receiving processor 1356 and the multi-antenna receiving processor 1358 implement various signal processing functions of the L1 layer. The multi-antenna receiving processor 1358 performs a receiving analog precoding / beamforming operation on the baseband multi-carrier symbol stream from the receiver 1354. The receiving processor 1356 uses a fast Fourier transform to convert the baseband multi-carrier symbol stream after the receiving analog precoding / beamforming operation from the time domain to the frequency domain. In the frequency domain, the physical layer data signal and the reference signal are demultiplexed by the receiving processor 1356, wherein the reference signal will be used for channel estimation, and the data signal is recovered after multi-antenna detection in the multi-antenna receiving processor 1358 to any spatial stream with the first communication device 1350 as the destination. The symbols on each spatial stream are demodulated and recovered in the receiving processor 1356, and soft decisions are generated. The receiving processor 1356 then decodes and deinterleaves the soft decisions to recover the upper layer data and control signals transmitted by the second communication device 1310 on the physical channel. The upper layer data and control signals are then provided to the controller / processor 1359. The controller / processor 1359 implements the functions of the L2 layer. The controller / processor 1359 may be associated with a memory 1360 that stores program codes and data. The memory 1360 may be referred to as a computer-readable medium. In the transmission from the second communication device 1310 to the first communication device 1350, the controller / processor 1359 provides multiplexing between transport and logical channels, packet reassembly, decryption, header decompression, control signal processing to recover the upper layer data packets from the second communication device 1310. The upper layer data packets are then provided to all protocol layers above the L2 layer. Various control signals may also be provided to the L3 for L3 processing.

[0297] In the transmission from the first communication device 1350 to the second communication device 1310, at the first communication device 1350, the upper layer data packets are provided to the controller / processor 1359 using the data source 1367. The data source 1367 represents all the protocol layers above the L2 layer. Similar to the transmission function at the second communication device 1310 described in the transmission from the second communication device 1310 to the first communication device 1350, the controller / processor 1359 implements header compression, encryption, packet segmentation and reordering, and multiplexing between logical and transport channels, and implements L2 layer functions for user plane and control plane. The controller / processor 1359 is also responsible for the retransmission of lost packets and signaling to the second communication device 1310. The transmit processor 1368 performs modulation mapping and channel coding processing, and the multi-antenna transmit processor 1357 performs digital multi-antenna spatial precoding, including codebook-based precoding and non-codebook-based precoding, and beamforming processing. Then, the transmit processor 1368 modulates the generated spatial stream into a multi-carrier / single-carrier symbol stream, which is then provided to different antennas 1352 via the transmitter 1354 after analog precoding / beamforming operations in the multi-antenna transmit processor 1357. Each transmitter 1354 first converts the baseband symbol stream provided by the multi-antenna transmit processor 1357 into a radio frequency symbol stream, and then provides it to the antenna 1352.

[0298] In the transmission from the first communication device 1350 to the second communication device 1310, the function at the second communication device 1310 is similar to the reception function at the first communication device 1350 described in the transmission from the second communication device 1310 to the first communication device 1350. Each receiver 1318 receives a radio frequency signal through its corresponding antenna 1320, converts the received radio frequency signal into a baseband signal, and provides the baseband signal to the multi-antenna reception processor 1372 and the reception processor 1370. The reception processor 1370 and the multi-antenna reception processor 1372 jointly implement the functions of the L1 layer. The controller / processor 1375 implements the L2 layer functions. The controller / processor 1375 can be associated with a memory 1376 that stores program codes and data. The memory 1376 can be referred to as a computer-readable medium. In transmission from the first communication device 1350 to the second communication device 1310, the controller / processor 1375 provides demultiplexing between transport and logical channels, packet reassembly, decryption, header decompression, and control signal processing to recover upper layer data packets from the first communication device 1350. The upper layer data packets from the controller / processor 1375 can be provided to the core network or all protocol layers above the L2 layer, and various control signals can also be provided to the core network or L3 for L3 processing.

[0299] As an embodiment, the first communication device 1350 apparatus includes: at least one processor and at least one memory, the at least one memory including computer program code; the at least one memory and the computer program code are configured to be used together with the at least one processor, and the first communication device 1350 apparatus at least: performs measurements on all frequencies in a first frequency subset respectively to obtain multiple measurement results; wherein a first parameter and a first threshold are used to determine whether to send a side synchronization signal block on one or more frequencies in the first frequency set, the multiple measurement results are used to determine the first parameter, and the first frequency subset belongs to the first frequency set.

[0300] As an embodiment, the first communication device 1350 apparatus includes: a memory storing a computer-readable instruction program, wherein the computer-readable instruction program generates an action when executed by at least one processor, and the action includes: performing measurements on all frequencies in a first frequency subset respectively to obtain multiple measurement results; wherein a first parameter and a first threshold are used to determine whether to send a side synchronization signal block on one or more frequencies in the first frequency set, and the multiple measurement results are used to determine the first parameter, and the first frequency subset belongs to the first frequency set.

[0301] As an embodiment, the first communication device 1350 corresponds to the first node in this application.

[0302] As an embodiment, the second communication device 1310 corresponds to the second node in this application.

[0303] As an embodiment, the first communication device 1350 is a user equipment, and the user equipment can serve as a relay node.

[0304] As an embodiment, the first communication device 1350 is a user equipment supporting V2X, and the user equipment can serve as a relay node.

[0305] As an embodiment, the first communication device 1350 is a user equipment supporting D2D, and the user equipment can serve as a relay node.

[0306] As an embodiment, the first communication device 1350 is a network control relay NCR.

[0307] As an embodiment, the first communication device 1350 is a relay wireless repeater.

[0308] As an embodiment, the first communication device 1350 is a relay.

[0309] As an embodiment, the second communication device 1310 is a base station.

[0310] As an embodiment, the antenna 1352, the receiver 1354, the multi-antenna receiving processor 1358, the receiving processor 1356, and the controller / processor 1359 are used to perform measurements on all frequencies in the first frequency subset respectively to obtain multiple measurement results.

[0311] As an embodiment, the antenna 1320, the transmitter 1318, the multi-antenna transmit processor 1371, the transmit processor 1316, and the controller / processor 1375 are used to send the first information in this application.

[0312] The present application also provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to a terminal or network device provided in the present application, and the program enables a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0313] The embodiment of the present application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to the terminal or network device provided in the embodiment of the present application, and the program enables the computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0314] The embodiment of the present application also provides a computer program. The computer program can be applied to the terminal or network device provided in the embodiment of the present application, and the computer program enables a computer to execute the method executed by the terminal or network device in each embodiment of the present application.

[0315] It should be understood that the terms "system" and "network" in this application can be used interchangeably. In addition, the terms used in this application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application. The terms "first", "second", "third" and "fourth" in the specification and claims of this application and the accompanying drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions.

[0316] In the embodiments of the present application, the "indication" mentioned can be a direct indication, an indirect indication, or an indication of an association relationship. For example, A indicates B, which can mean that A directly indicates B, for example, B can be obtained through A; it can also mean that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also mean that there is an association relationship between A and B.

[0317] In the embodiment of the present application, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should be understood that determining B according to A does not mean determining B only according to A, and B can also be determined according to A and / or other information.

[0318] In the embodiments of the present application, the term "corresponding" may indicate that there is a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship of indication and being indicated, configuration and being configured, etc.

[0319] In the embodiments of the present application, "pre-definition" or "pre-configuration" can be implemented by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in a device (for example, including a user device and a network device), and the present application does not limit the specific implementation method. For example, pre-definition can refer to what is defined in the protocol.

[0320] In the embodiments of the present application, the “protocol” may refer to a standard protocol in the communication field, for example, it may include an LTE protocol, an NR protocol, and related protocols used in future communication systems, and the present application does not limit this.

[0321] In the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0322] In various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0323] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0324] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0325] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0326] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that can be read by a computer or a data storage device such as a server or data center that includes one or more available media integrated. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital video disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0327] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method in a first node for wireless communication, characterized in that include: Performing measurement on a first frequency to obtain a first reference signal received power RSRP value, where the first frequency is any frequency in the first frequency subset; When the first RSRP value is lower than a first threshold, sending a side synchronization signal block on the first frequency; The first frequency subset belongs to a first frequency set, the first frequency subset does not include a synchronization carrier frequency in the first frequency set, the first frequency subset includes one or more frequencies, and the frequencies in the first frequency set are frequencies that can be used for synchronization.

2. The method according to claim 1, characterized in that The method further comprises: When the first RSRP value is not lower than the first threshold, the sending of the side synchronization signal block on the first frequency is abandoned.

3. The method according to claim 1 or 2, characterized in that: The method further comprises: selecting a synchronization reference and said synchronization carrier frequency; The measurement result on the synchronization carrier frequency is used for synchronization of frequencies in the first frequency subset; and the synchronization reference corresponds to the synchronization carrier frequency.

4. The method according to claim 3, characterized in that The synchronization carrier frequency is selected from the plurality of frequencies included in the first frequency set, and the synchronization carrier frequency is used by the first node to determine a synchronization reference.

5. The method according to claim 3, characterized in that: A synchronization source on the synchronization carrier frequency is selected by the first node as a synchronization reference.

6. The method according to claim 3, characterized in that The synchronization reference is a global navigation satellite system GNSS, a base station or a synchronization reference user SyncRef UE.

7. The method according to claim 3, characterized in that The synchronization reference is used for frequencies in a second frequency set, which includes the first frequency set; the second frequency set is a frequency set that can be used for synchronization and is configured by a high layer, and the first frequency set is a currently aggregated frequency set that can be used for synchronization.

8. The method according to claim 3, characterized in that The first node is located within the coverage of the synchronization reference at a frequency in the first frequency subset, and the first RSRP value is an RSRP measurement value of a serving cell of the first node.

9. The method according to claim 3, characterized in that: The first node is not in the coverage related to the synchronization reference at the frequency in the first frequency subset, and the first RSRP value is the RSRP measurement value of the S-SSB sent by the synchronization reference user SyncRef UE.

10. The method according to any one of claims 1 to 3, characterized in that: The first threshold is a first candidate threshold or a second candidate threshold, and whether the first node is within coverage on the first frequency subset is used to determine the first threshold.

11. The method according to claim 10, characterized in that When the first node is within coverage on the first frequency subset, the first threshold is the first candidate threshold syncTxThreshIC; when the first node is not within coverage on the first frequency set, the first threshold is the second candidate threshold syncTxThreshOoC.

12. The method according to any one of claims 1 to 3, characterized in that A plurality of RSRP values ​​are obtained by measuring a plurality of frequencies in the first frequency subset, and the plurality of RSRP values ​​are respectively used to determine to send side synchronization signal blocks respectively on corresponding frequencies in the first frequency subset.

13. A method in a second node for wireless communication, characterized in that: include: Sending first information, the first information comprising a second frequency set, the second frequency set being used by the first node to determine a first frequency set, the first frequency set comprising a first frequency subset; Among them, the first reference signal received power RSRP value and the first threshold are used by the first node to determine to send a side synchronization signal block on the first frequency in the first frequency set, the first RSRP value is lower than the first threshold, the first RSRP value is the measurement result of the first frequency, the first frequency subset does not include the synchronization carrier frequency in the first frequency set, the first frequency subset includes one or more frequencies, and the frequencies in the first frequency set are frequencies that can be used for synchronization.

14. The method according to claim 13, characterized in that A synchronization source on the synchronization carrier frequency is selected by the first node as a synchronization reference.

15. The method according to claim 14, characterized in that The synchronization reference is a global navigation satellite system GNSS, a base station or a synchronization reference user SyncRef UE.

16. The method according to claim 13, characterized in that The synchronization reference is used for the frequencies in the second frequency set, which includes the first frequency set; the second frequency set is a frequency set that can be used for synchronization configured by a high layer, and the first frequency set is a currently aggregated frequency set that can be used for synchronization.

17. The method according to claim 13, characterized in that The first node is within the coverage of a synchronization reference at a frequency in the first frequency subset, and the first RSRP value is an RSRP measurement value of a serving cell of the first node.

18. The method according to claim 13, characterized in that The first node is not in the coverage related to the synchronization reference at any frequency in the first frequency subset, and the first RSRP value is the RSRP measurement value of the S-SSB sent by the synchronization reference user.

19. The method according to claim 13 or 14, characterized in that The method further comprises: Sending second information, wherein the second information includes a first candidate threshold syncTxThreshIC and a second candidate threshold syncTxThreshOoC; The first threshold is the first candidate threshold or the second candidate threshold, and whether the first node is within coverage on the first frequency subset is used to determine the first threshold.

20. A first node for wireless communication, characterized in that: include: The processor is configured to measure a first frequency to obtain a first reference signal received power RSRP value, where the first frequency is any frequency in the first frequency subset; when the first RSRP value is lower than a first threshold, send a side synchronization signal block on the first frequency; The first frequency subset belongs to a first frequency set, the first frequency subset does not include a synchronization carrier frequency in the first frequency set, the first frequency subset includes one or more frequencies, and the frequencies in the first frequency set are frequencies that can be used for synchronization.

21. The first node according to claim 20, characterized in that: The first node also includes: The first transmitter is configured to abandon sending a side synchronization signal block on the first frequency when the first RSRP value is not lower than the first threshold.

22. The first node according to claim 20 or 21, characterized in that: The processor is further configured to select a synchronization reference and a synchronization carrier frequency, wherein the measurement result on the synchronization carrier frequency is used for synchronization of frequencies in the first frequency subset; and the synchronization reference corresponds to the synchronization carrier frequency.

23. The first node according to claim 22, characterized in that The synchronization carrier frequency is selected from the plurality of frequencies included in the first frequency set, and the synchronization carrier frequency is used by the first node to determine a synchronization reference.

24. The first node according to claim 22, characterized in that: A synchronization source on the synchronization carrier frequency is selected by the first node as a synchronization reference.

25. The first node according to claim 22, characterized in that The synchronization reference is a global navigation satellite system GNSS, a base station or a synchronization reference user SyncRef UE.

26. The first node according to claim 22, characterized in that The synchronization reference is used for frequencies in a second frequency set, which includes the first frequency set; the second frequency set is a frequency set that can be used for synchronization and is configured by a high layer, and the first frequency set is a currently aggregated frequency set that can be used for synchronization.

27. The first node according to claim 22, characterized in that The first node is located within the coverage of the synchronization reference at a frequency in the first frequency subset, and the first RSRP value is an RSRP measurement value of a serving cell of the first node.

28. The first node according to claim 22, characterized in that The first node is not in the coverage related to the synchronization reference at a frequency in the first frequency subset, and the first RSRP value is an RSRP measurement value of an S-SSB sent by a synchronization reference user SyncRefUE.

29. The first node according to any one of claims 20 to 22, characterized in that: The first threshold is a first candidate threshold or a second candidate threshold, and whether the first node is within coverage on the first frequency subset is used to determine the first threshold.

30. The first node according to claim 29, characterized in that When the first node is within coverage on the first frequency subset, the first threshold is the first candidate threshold syncTxThreshIC; when the first node is not within coverage on the first frequency set, the first threshold is the second candidate threshold syncTxThreshOoC.

31. The first node according to claim 29 or 30, characterized in that: A plurality of RSRP values ​​are obtained by measuring a plurality of frequencies in the first frequency subset, and the plurality of RSRP values ​​are respectively used to determine to send side synchronization signal blocks respectively on corresponding frequencies in the first frequency subset.

32. A second node for wireless communication, characterized in that: include: a third transmitter, configured to send first information, wherein the first information includes a second frequency set, the second frequency set is used by the first node to determine a first frequency set, and the first frequency set includes a first frequency subset; Among them, the first reference signal received power RSRP value and the first threshold are used by the first node to determine to send a side synchronization signal block on the first frequency in the first frequency set, the first RSRP value is lower than the first threshold, the first RSRP value is the measurement result of the first frequency, the first frequency subset does not include the synchronization carrier frequency in the first frequency set, the first frequency subset includes one or more frequencies, and the frequencies in the first frequency set are frequencies that can be used for synchronization.

33. The second node according to claim 32, characterized in that: A synchronization source on the synchronization carrier frequency is selected by the first node as a synchronization reference.

34. The second node according to claim 32, characterized in that: The synchronization reference is a global navigation satellite system GNSS, a base station or a synchronization reference user SyncRef UE.

35. The second node according to claim 34, characterized in that: The synchronization reference is used for frequencies in the second frequency set, which includes the first frequency set; the second frequency set is a frequency set that can be used for synchronization configured by a high layer, and the first frequency set is a currently aggregated frequency set that can be used for synchronization.

36. The second node according to claim 35, characterized in that: The first node is located within the coverage of the synchronization reference at a frequency in the first frequency subset, and the first RSRP value is an RSRP measurement value of a serving cell of the first node.

37. The second node according to claim 35, characterized in that: The first node is not within the coverage associated with the synchronization reference at a frequency in the first frequency subset, and the first RSRP value is an RSRP measurement value of an S-SSB sent by a synchronization reference user.

38. The second node according to claim 32 or 33, characterized in that: The second node also includes: A fourth transmitter, configured to send second information, wherein the second information includes a first candidate threshold syncTxThreshIC and a second candidate threshold syncTxThreshOoC; The first threshold is the first candidate threshold or the second candidate threshold, and whether the first node is within coverage on the first frequency subset is used to determine the first threshold.

39. A node used for wireless communication, characterized in that: It includes a transceiver, a memory and a processor, wherein the memory is used to store programs, and the processor is used to call the programs in the memory and control the transceiver to receive or send signals so that the node executes the method as described in any one of claims 1-12 or 13-19.

40. A communication device, characterized in that: It comprises a processor, which is used to call a program from a memory so that the communication device executes the method as described in any one of claims 1-12 or 13-19.

41. A chip, characterized in that: It comprises a processor, which is used to call a program from a memory, so that a device equipped with the chip executes the method as described in any one of claims 1-12 or 13-19.

42. A computer-readable storage medium, characterized in that: A program is stored thereon, the program causing a computer to execute the method according to any one of claims 1-12 or 13-19.

43. A computer program product, characterized in that The method comprises a program which causes a computer to execute the method as claimed in any one of claims 1 to 12 or 13 to 19.

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