Detection method and apparatus, measurement method and apparatus, evaluation method and apparatus, device and medium

Abstract

The present application belongs to the field of sidelink communications. Disclosed are a detection method and apparatus, a measurement method and apparatus, an evaluation method and apparatus, a device and a medium. The detection method comprises: under the condition that a first sampling result in a detection time period does not meet a first condition, prolonging the detection time period, wherein the detection time period is used for detecting a synchronization source by means of an SL-U. By defining the prolonging mode for the detection time period when detecting the synchronization source in the SL-U, the mode of determining the detection time period in the SL-U is thus defined, and an implementation mode of detecting the synchronization source in the SL-U is provided.

Description

Detection methods, measurement methods, evaluation methods, devices, equipment and media Technical Field

[0001] The present application relates to the field of sideline communications, and in particular to a detection method, a measurement method, an evaluation method, a device, an equipment and a medium. Background Art

[0002] One of the characteristics that distinguishes the sidelink from the Uu-link is the synchronization process. A terminal can use the Global Navigation Satellite System (GNSS), cell, and other terminals as synchronization sources, selecting or reselecting synchronization sources based on a preset or configured priority order. To expand the synchronization range, a terminal triggers the transmission of a Sidelink Synchronization Signal (SLSS) when certain conditions are met, allowing other terminals to obtain its synchronization information.

[0003] One of the current enhancements to sidelink communications is extending it to unlicensed spectrum bands, known as Sidelink Unlicensed (SL-U). Further research is needed to implement the synchronization-related processes described above on the unlicensed sidelink.

[0004] Summary of the Invention

[0005] This application provides a detection method, measurement method, evaluation method, device, equipment, and medium. The technical solution is as follows:

[0006] According to one aspect of the present application, a detection method is provided, which is performed by a sideline terminal and includes:

[0007] If the first sampling result within the detection time period does not meet the first condition, extending the detection time period;

[0008] The detection time period is used to detect the synchronization source through SL-U.

[0009] According to one aspect of the present application, a measurement method is provided, which is performed by a sideline terminal and includes:

[0010] During measurement of the first synchronization source of the SL-U, if a second condition is met, it is determined that the first synchronization source is unavailable.

[0011] According to one aspect of the present application, an evaluation method is provided, which is performed by a sideline terminal and includes:

[0012] Extending an evaluation period by a seventh parameter, wherein the evaluation period is used to evaluate a measurement result of a currently selected synchronization source in the SL-U, and the evaluation result is used to trigger transmission of a synchronization signal;

[0013] The seventh parameter is related to the fifth parameter, and the fifth parameter is used to extend the measurement time period to a maximum measurement time period, and the measurement time period is used to measure the synchronization source.

[0014] According to one aspect of the present application, a detection device is provided, comprising:

[0015] an extension module, configured to extend the detection time period if a first sampling result within the detection time period does not satisfy a first condition;

[0016] The detection time period is used to detect the synchronization source through SL-U.

[0017] According to one aspect of the present application, a measuring device is provided, comprising:

[0018] The determination module is configured to determine that, during measurement of a first synchronization source of the SL-U, the first synchronization source is unavailable if a second condition is met.

[0019] According to one aspect of the present application, an evaluation device is provided, comprising:

[0020] an extension module, configured to extend an evaluation time period by using a seventh parameter, wherein the evaluation time period is used to evaluate a measurement result of a currently selected synchronization source in the SL-U, and the evaluation result is used to trigger transmission of a synchronization signal;

[0021] The seventh parameter is related to the fifth parameter, and the fifth parameter is used to extend the measurement time period to a maximum measurement time period, and the measurement time period is used to measure the synchronization source.

[0022] According to another aspect of the present application, a side-traffic terminal is provided, comprising: a processor; a transceiver connected to the processor; and a memory for storing executable instructions of the processor; wherein the side-traffic terminal is configured to load and execute the executable instructions to implement the detection method, measurement method, or evaluation method as described in the above aspects.

[0023] According to another aspect of the present application, a network device is provided, comprising: a processor; a transceiver connected to the processor; and a memory for storing executable instructions of the processor; wherein the network device is configured to load and execute the executable instructions to implement the detection method, measurement method, or evaluation method as described in the above aspects.

[0024] According to another aspect of the present application, a computer-readable storage medium is provided, in which executable instructions are stored. The executable instructions are loaded and executed by a processor to implement the detection method, measurement method, or evaluation method as described in the above aspects.

[0025] According to another aspect of the present application, a chip is provided, which includes a programmable logic circuit and / or program instructions. When the chip is run on a computer device, it is used to implement the detection method, measurement method or evaluation method described in the above aspects based on the programmable logic circuit and / or program.

[0026] According to another aspect of the present application, a computer program product or computer program is provided, which includes computer instructions stored in a computer-readable storage medium, and a processor reads and executes the computer instructions from the computer-readable storage medium, so that a computer device performs the detection method, measurement method or evaluation method described in the above aspects.

[0027] The technical solutions provided by the embodiments of the present application include at least the following beneficial effects:

[0028] By clarifying the method for extending the detection time period when detecting the synchronization source in SL-U, the method for determining the detection time period in SL-U is clarified, and an implementation method for detecting the synchronization source in SL-U is provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0030] FIG1 is a schematic diagram of network coverage inner line communication provided by an exemplary embodiment of the present application;

[0031] FIG2 is a schematic diagram of partial network coverage sideline communication provided by an exemplary embodiment of the present application;

[0032] FIG3 is a schematic diagram of network coverage outer line communication provided by an exemplary embodiment of the present application;

[0033] FIG4 is a schematic diagram of a system architecture of a communication system provided by an embodiment of the present application;

[0034] FIG5 is a flow chart of a detection method provided by an exemplary embodiment of the present application;

[0035] FIG6 is a flow chart of a measurement method provided by an exemplary embodiment of the present application;

[0036] FIG7 is a flow chart of an evaluation method provided by an exemplary embodiment of the present application;

[0037] FIG8 is a flow chart of a detection method provided by an exemplary embodiment of the present application;

[0038] FIG9 is a flow chart of a detection method provided by an exemplary embodiment of the present application;

[0039] FIG10 is a flow chart of a detection method provided by an exemplary embodiment of the present application;

[0040] FIG11 is a flow chart of a detection method provided by an exemplary embodiment of the present application;

[0041] FIG12 is a flow chart of a measurement method provided by an exemplary embodiment of the present application;

[0042] FIG13 is a flow chart of a measurement method provided by an exemplary embodiment of the present application;

[0043] FIG14 is a flow chart of an evaluation method provided by an exemplary embodiment of the present application;

[0044] FIG15 is a schematic diagram of an evaluation period provided by an exemplary embodiment of the present application;

[0045] FIG16 is a block diagram of a detection device provided by an exemplary embodiment of the present application;

[0046] FIG17 is a block diagram of a measuring device provided by an exemplary embodiment of the present application;

[0047] FIG18 is a block diagram of an evaluation device provided by an exemplary embodiment of the present application;

[0048] FIG19 is a schematic structural diagram of a communication device provided by an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0049] To make the objectives, technical solutions, and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings. Exemplary embodiments will be described in detail herein, with examples shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0050] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0051] It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining."

[0052] First, some terms involved in the embodiments of this application are introduced as follows:

[0053] Introduction to sideline communication:

[0054] In sideline communication (communication based on sideline links), according to the network coverage of the communicating terminals, it can be divided into three situations: sideline communication within network coverage, sideline communication with partial network coverage, and sideline communication outside network coverage.

[0055] For example, Figure 1 is a schematic diagram of network coverage inner row communication provided by an exemplary embodiment of the present application, Figure 2 is a schematic diagram of partial network coverage side row communication provided by an exemplary embodiment of the present application, and Figure 3 is a schematic diagram of network coverage outer row communication provided by an exemplary embodiment of the present application.

[0056] As shown in Figure 1, in the case of sideline communication within network coverage, all terminals performing sideline communication are within the coverage of the same base station. Therefore, the above terminals can all perform sideline communication based on the same sideline configuration by receiving configuration signaling from the base station, and the sideline configuration may include time-frequency resources for sideline communication.

[0057] As shown in Figure 2, in the case of partial network coverage for sidelink communication, the first part of the terminals performing sidelink communication are located within the coverage of the base station. The terminals in the first part can receive the configuration signaling from the base station, thereby performing sidelink communication according to the configuration of the base station. However, the second part of the terminals performing sidelink communication are located outside the network coverage, and the terminals in the second part cannot receive the configuration signaling from the base station. In this case, the terminals outside the network coverage will determine the sidelink configuration based on the pre-configuration information and the information carried in the Physical Sidelink Broadcast Channel (PSBCH) sent by the terminals within the network coverage, thereby performing sidelink communication.

[0058] As shown in Figure 3, in the case of sideline communication outside the network coverage, all terminals performing sideline communication are located outside the network coverage. All terminals performing sideline communication determine the sideline configuration according to the pre-configuration information to perform sideline communication.

[0059] This section introduces New Radio (NR) sidelink (SL) measurements:

[0060] One of the characteristics that distinguishes the sidelink from the Uu interface link (Uu-link) is the synchronization process. Users (such as terminals) can use the Global Navigation Satellite System (GNSS), NR or Evolved UMTS Terrestrial Radio Access Network (EUTRAN / E-UTRAN) cells, as well as other users that send sidelink synchronization signal blocks (S-SSB) as their synchronization sources (synchronization reference sources), and select or reselect synchronization sources according to the preset or configured synchronization source priority order. In order to expand the synchronization range, the user will trigger the sending of the sidelink synchronization signal (SLSS) when certain conditions are met so that other users can obtain their synchronization information. In the related art, corresponding measurement / evaluation indicators are defined.

[0061] (1) Select or reselect the synchronization source - detection

[0062] According to the configuration, it can be divided into two categories:

[0063] 1) When the GNSS synchronization source is configured as the highest priority:

[0064] When users synchronize directly to GNSS (highest priority), there is no need to search for a synchronization source, and thus no dropped Vehicle to Everything (V2X) SLSS and data transmissions.

[0065] Example 1: When a user synchronizes to a SyncRef UE (e.g., another user that can serve as a synchronization source), and the SyncRef UE is synchronized directly or indirectly to GNSS, the user only needs to search for GNSS or other SyncRef UEs synchronized (directly or indirectly) to GNSS. In this case, the detection time is 1.6s (the SLSS transmission period is fixed at 160ms, 10 periods), and the maximum interruption rate of SLSS transmission to the user is 30%, that is, a maximum of 3 SLSS in 10 periods. Specific descriptions are as follows:

[0066] The UE shall not discard any V2X data transmission for the purpose of selecting / reselecting a synchronization reference terminal. If the synchronization reference terminal meets the defined selection / reselection criteria, the UE shall be able to identify the newly detected co-frequency synchronization reference terminal within Tdetect,SyncRef UE_V2X seconds. When (indicates signal-to-noise ratio) ≥ 0dB, Tdetect,SyncRef UE_V2X is defined as 1.6 seconds, provided that the terminal is allowed to detect,SyncRef UE_V2X The maximum proportion of its SLSS transmissions dropped during this period is 30% in order to select / reselect to the synchronization reference terminal.

[0067] In Example 1 above, GNSS has the highest priority. When the terminal's current synchronization reference terminal is directly or indirectly synchronized to GNSS, the terminal only needs to search for synchronization sources with higher or equal priority. These synchronization sources are all directly or indirectly synchronized to GNSS and are approximately synchronized from the terminal's perspective (the arrival time usually has only a small difference, such as a few microseconds), that is, the scenario of detecting the synchronized synchronization source. Therefore, it is only necessary to determine the position of the S-SSB according to the current timing to search. This also only affects the terminal's SLSS transmission and does not affect V2X data transmission.

[0068] Example 2: In other cases (e.g., when a user synchronizes to a serving cell or indirectly synchronizes to a cell), a higher-priority synchronization source may be asynchronous with the current user's synchronization source, impacting both V2X data and SLSS transmissions. In this case, the detection time is 8 seconds (i.e., 50 SLSS cycles), and the maximum interruption rate for the user's V2X data and SLSS transmission is 6%, meaning a maximum of 3 SLSSs per 50 cycles. Furthermore, receive dropping is considered. During each Physical Sidelink Broadcast Channel (PSBCH) monitoring occasion, up to two slots of V2X data reception are dropped, with a total drop rate not exceeding 0.3%. (If the timing of the user's currently receiving V2X data differs significantly from the timing of other PSBCH synchronization sources, simultaneous reception may not be possible, necessitating V2X data dropping.) Related technologies consider sidelink discontinuous reception (SL-DRX) and make certain modifications to reception discarding, allowing users to extend the detection time under certain conditions. The details are as follows:

[0069] Non-SL-DRX:

[0070] If the synchronization reference terminal meets the defined selection / reselection criteria, the terminal shall be able to identify the newly detected same-frequency synchronization reference terminal within Tdetect,SyncRef UE_V2X seconds. When Tdetect,SyncRef UE_V2X is used, Tdetect,SyncRef UE_V2X is defined as 8 seconds, provided that the terminal is allowed to drop a maximum of 6% of its V2X data and SLSS transmissions during Tdetect,SyncRef UE_V2X in order to select / reselect to the synchronization reference terminal.

[0071] The terminal is allowed to drop up to 2 timeslots of V2X data reception at each PSBCH monitoring opportunity, and in order to select / reselect to the synchronization reference terminal, the total drop rate should not exceed 0.3% of its V2X data during Tdetect,SyncRef UE_V2X in order to select / reselect to the synchronization reference terminal.

[0072] SL-DRX:

[0073] If the synchronization reference terminal meets the defined selection / reselection criteria, the terminal shall be able to identify the newly detected same-frequency synchronization reference terminal within Tdetect,SyncRef UE_V2X seconds. When Tdetect,SyncRef UE_V2X is used, Tdetect,SyncRef UE_V2X is defined as 8 seconds, provided that the V2X terminal is allowed to drop a maximum of 6% of its V2X data and SLSS transmissions in order to select / reselect to the synchronization reference terminal.

[0074] The terminal is allowed to discard up to 2 V2X data reception time slots at each PSBCH monitoring opportunity, and the terminal is allowed to detect,SyncRef UE_V2X During this period, it discards an aggregation window of up to 24ms of its V2X data reception in order to select / reselect to a synchronization reference terminal.

[0075] When the synchronization signal (SS)-reference signal receiving power (RSRP) is greater than the threshold syncTxThreshOoC, the terminal is allowed to set T detect,SyncRef UE_V2X Extended to max (4*50SL-DRX cycle length, 8s):

[0076] For NR cells used as synchronization reference source, the evaluation period T in clause 12.3.1.1 evaluate,SLSS ;

[0077] For EUTRA cells used as synchronization reference source, the evaluation period T in clause 12.3.1.2 evaluate,SLSS ;

[0078] For SLSS used as synchronization reference source, the evaluation period T in clause 12.3.1.4 is exceeded evaluate,SLSS If multiple SL-DRX cycles are configured, the SL-DRX cycle length is the longest one.

[0079] The above example 2 can be regarded as a scenario where an asynchronous synchronization source needs to be detected (both synchronous and asynchronous synchronization sources can be searched).

[0080] 2) When the serving cell synchronization source is configured as the highest priority, since the timing between different cells has a certain deviation and is not completely synchronized, this scenario is equivalent to the above example 2.

[0081] (2) Select or reselect synchronization source - PSBCH - RSRP measurement

[0082] After detecting other (candidate) synchronization sources, the user needs to measure the PSBCH-RSRP of these synchronization sources and determine whether to reselect the synchronization source based on the measurement results. For example, whether the RSRP of the higher-priority synchronization source meets certain conditions, or whether the RSRP of the same priority is higher. At the same time, the user will also continuously measure the PSBCH-RSRP of the currently selected synchronization source to determine whether the current synchronization source is available. The measurement time is 2 max (S-SSB period, SL-DRX cycle), as follows:

[0083] The terminal should be able to measure the period T in Table 1 measure,PSBCH-RSRP PSBCH-RSRP measurements are performed on the three identified co-frequency synchronization reference terminals. The above assumes that the co-frequency synchronization reference terminals do not discard or delay any SLSS transmissions during the measurement period. Otherwise, the measurement period may be extended. Table 1 shows the PSBCH-RSRP measurement period for the co-frequency synchronization reference terminals.

[0084] Table 1

[0085] (3) Starting and stopping SLSS transmission—PSBCH-RSRP evaluation

[0086] Whether the user sends SLSS depends on the current synchronization source, which can be divided into four cases: NR cell, EUTRAN cell, GNSS, and other synchronization reference terminals. This embodiment mainly discusses the last one.

[0087] When a user synchronizes to another synchronization reference terminal, it determines whether to send SLSS based on the currently measured PSBCH-RSRP of its synchronization source (synchronization reference terminal). For example, if the PSBCH-RSRP is less than the configured threshold, the user is required to send SLSS. The evaluation period is 4 max (S-SSB cycle, SL-DRX cycle). This evaluation period includes two PSBCH-RSRP measurements, and the evaluation process allows for high-level filtering of multiple PSBCH-RSRP measurement results.

[0088] The terminal shall be able to measure the PSBCH-RSRP of the selected synchronization reference terminal used as synchronization source and evaluate,SLSS It is evaluated during the synchronization process to determine whether to start / stop SLSS transmission, as shown in Table 2. Table 2 shows the T when the synchronization reference terminal is used as the synchronization source. evaluate,SLSS .

[0089] Table 2

[0090] If higher layer filtering for PSBCH-RSRP measurements is pre-configured, additional delay may occur in the evaluation of starting / stopping SLSS transmission.

[0091] Introduction to Sidelink Unlicensed (SL-U) in unlicensed bands:

[0092] One enhancement to sidelink communication in related technologies is extending it to unlicensed spectrum, known as SL-U. In unlicensed spectrum, carrier channel monitoring mechanisms such as Listen Before Talk (LBT) are required to determine channel availability before transmitting signals. This can sometimes prevent SLSS transmission, impacting the corresponding measurement time at the receiver (including synchronization source detection, PSBCH-RSRP measurement, and evaluation).

[0093] In the same-frequency measurement of NR-U, Lpss / sss sampling points are added to the original measurement time. Lpss / sss is the number of unavailable SSB measurement timing configurations (SMTC). For example, if five sampling points are originally to be measured, but the receiving end finds that the SMTC of one of the sampling points is unavailable, the measurement is extended for one cycle, and Lpss / sss=1. In order to avoid indefinite extension of the measurement time, the maximum value of Lpss / sss is constrained in the protocol, namely Lpss / sss_max. When the maximum value is exceeded, the terminal is not required to meet the requirements for primary synchronization signal (PSS) and secondary synchronization signal (SSS) detection. Table 3 shows the time period of PSS / SSS detection (Frequency Range 1 (FR1)).

[0094] Table 3

[0095] For SL-U, how to extend the above measurement time is a problem that needs to be solved. Some candidate solutions are given in the relevant art, as follows:

[0096] For V2X synchronization source selection / reselection:

[0097] Requirements for synchronization reference terminals that synchronize directly or indirectly to GNSS:

[0098] If the synchronization reference terminal meets the defined selection / reselection criteria, the terminal shall be able to identify the newly detected same-frequency synchronization reference terminal within Tdetect,SyncRef UE_V2X seconds. Tdetect,SyncRef UE_V2X is specified in the S-SSB. The maximum value (B) is defined as (A), assuming that the terminal is allowed to discard the maximum value (B) for the purpose of selecting / reselecting a synchronization reference terminal. Here, A represents the time required for detection, and B represents the discard probability. This is for the synchronization scenario, i.e., Example 1 above.

[0099] Option 1:

[0100] A: (1.6 + 1.6 * x 1) seconds;

[0101] B: 30% of SLSS transmission during Tdetect,SyncRef UE_V2X;

[0102] The value of x1 is the number of 1.6s detection windows in which there is at least one unavailable S-SSB period among the three selected S-SSB periods for S-SSB search, and the selection of the three S-SSB periods in the 1.6s detection window depends on the terminal implementation. Where x1 < x1_max.

[0103] Option 2:

[0104] A: (1.6 + 0.16 * x1) seconds;

[0105] B-1: Tdetect,SyncRef [(3+x1_max) / (10+x1_max)]*100% of SLSS transmission during UE_V2X;

[0106] B-2: Tdetect,SyncRef [(3+x1) / (10+x1)]*100% of SLSS transmission during UE_V2X;

[0107] x1 is the number of unavailable S-SSB cycles, where x1 < x1_max.

[0108] If the synchronization reference terminal meets the defined selection / reselection criteria, the terminal shall be able to identify the newly detected synchronization reference terminal on the same frequency within Tdetect,SyncRef UE_V2X seconds. Tdetect,SyncRef UE_V2X is specified in the S-SSB. The time required for detection is defined as (C), assuming that the terminal is allowed to discard the maximum value (D) for the purpose of selecting / reselecting a synchronization reference terminal. Here, C represents the time required for detection, and D represents the probability of discarding. This is for asynchronous scenarios, i.e., Example 2 above.

[0109] Option 1:

[0110] C: (8+8*x2) seconds;

[0111] D: 6% of V2X data and SLSS transmission during Tdetect,SyncRef UE_V2X;

[0112] The value of x2 is the number of 8s detection windows with at least one unavailable S-SSB period in the 480ms search window of each 8s period, and the position of the 480ms search window depends on the terminal implementation. Where x2 < x2_max.

[0113] Option 2:

[0114] C: (8 + 0.16 * x2) seconds;

[0115] D-1: [(0.48+0.16*x2_max) / (8+0.16*x2_max)]*100% of V2X data and SLSS transmission during Tdetect,SyncRef UE_V2X;

[0116] D-2: Tdetect,SyncRef UE_V2X period V2X data and SLSS transmission [(0.48 + 0.16 * x2) / (8 + 0.16 * x2)] * 100%;

[0117] x2 is the number of unavailable S-SSB cycles, where x2 < x2_max.

[0118] The reception dropout rate of its V2X data reception during Tdetect,SyncRef UE_V2X, which is used to select / reselect the synchronization reference terminal.

[0119] For T measure,PSBCH-RSRP Requirements:

[0120] Regarding the information of “y” and “y_max” values, the related art measure,PSBCH-RSRP The required protocols are shown in Table 4:

[0121] Table 4

[0122] y is the S-SSB period during which SLSS is unavailable due to LBT failure, and y_max has an upper limit.

[0123] Option 1: More progress is needed to determine T measure,PSBCH-RSRP The value of y in .

[0124] Option 2: The L for starting / stopping SLSS transmission requirements should be defined taking into account the number of S-SSB opportunities within the S-SSB cycle. PSBCH,max (y_max), and L PSBCH,max You can use L SLSS,max The value of .

[0125] Option 3: y is in T for S-SSB assessment evaluate,SLSS,SL-U The number of S-SSB opportunities during which the terminal is unavailable, where y≤y_max.

[0126] Option 4: Consider changing T measure,PSBCH-RSRP Extend y and set y_max as the upper limit. The terminal can consider y and y_max based on the priority of the synchronization source, or consider other solutions.

[0127] Option 5: In the reselection requirement of the synchronization reference terminal, for all DRX cycles, the measurement period T measure,PSBCH-RSRP The maximum number of LBT failures allowed during a period is defined as 16.

[0128] Requirements for exceeding the maximum number of LBT failures:

[0129] Option 1: No additional requirements or procedures are defined when the maximum allowed number of LBT failures for V2X synchronization source selection / reselection is exceeded.

[0130] Option 2: In T measure,PSBCH-RSRP When the maximum allowed number of LBT failures is exceeded during the period, the terminal should stop using the synchronization reference terminal as a synchronization reference source.

[0131] When the PSBCH-RSRP measurement exceeds the maximum allowed number of failed LBTs, the user's behavior needs to be clarified.

[0132] Requirements for the synchronization reference terminal as a synchronization reference source:

[0133] Regarding the information about the "x" and "x_max" values, the protocol for starting / stopping SLSS transmission requirements in the related art is as follows:

[0134] The measurement (evaluation) period is extended to 4+x S-SSB periods, where x is the S-SSB period during which SLSS is unavailable due to LBT failure, and is capped at x_max.

[0135] Option 1: More progress is needed to determine the value of x_max in the measurement cycle requirement.

[0136] Option 2: The number of S-SSB opportunities within an S-SSB period should be considered to define the L for starting / stopping the SLSS transmission requirement. SLSS,max (x_max).

[0137] Option 3: The related art introduces the requirement that x_max = [4] for the synchronization reference terminal to be used as the synchronization reference source.

[0138] Option 4: x is in T for S-SSB assessment evaluate,SLSS,SL-U The number of S-SSB opportunities during which the terminal is unavailable, where x≤x_max; x_max=5 in non-SL-DRX or SL-DRX cycle ≤160ms, x_max=3 in SL-DRX cycle >160ms.

[0139] Option 5: Consider the relevant technology and evaluate the period T evaluate,SLSS Extend x S-SSB cycles or SL-DRX cycles, where x and x_max can be determined, for example, based on the priority of the synchronization source or other criteria for associating the values ​​of x and x_max; related technologies should also consider extending the measurement cycle requirements based on S-SSB design considerations.

[0140] Option 6: For all DRX cycles, the maximum number of LBT failures allowed during the evaluation of start / stop SLSS (X_max) is defined as 32.

[0141] When the synchronization reference terminal is used as the synchronization source, the user evaluates the time required to start / stop SLSS.

[0142] Based on the above introduction, it is currently necessary to clarify how to determine the synchronization-related detection / measurement / evaluation time period in SL-U, as well as the terminal behavior when the set maximum value is exceeded. This can be divided into the following issues:

[0143] (1) How to determine the time period for detecting the synchronization reference terminal and the allowable Tx / Rx dropping rate during the detection of other synchronization sources in SL-U?

[0144] (2) How to determine the PSBCH-RSRP measurement period in SL-U and the receiver's behavior when the required measurement time exceeds the maximum allowed value need to be clarified. The current solution recommends re-measurement, but infinitely re-measuring the same synchronization source may waste the receiver's resources and miss new synchronization sources.

[0145] (3) How to determine the PSBCH-RSRP evaluation period in SL-U and the behavior of the receiver when the required evaluation time exceeds the maximum allowed value need to be clarified, especially whether to trigger SLSS transmission.

[0146] The method provided in the embodiment of the present application provides a method for determining time periods and terminal behaviors for three radio resource management (RRM)-related processes in SL-U, including:

[0147] (1) Determine the detection time period of the synchronization reference terminal.

[0148] a. Gradually increase the detection time according to the detection results (sampling results) and optimize the stopping conditions. Compared with other existing solutions, it can give priority to reducing the detection time.

[0149] b. Directly adopt the maximum detection time period (regardless of the detection results) and correspondingly increase the number of detection cycles that can be selected within the detection time period.

[0150] (2) For the PSBCH-RSRP measurement period, if the required measurement time exceeds the maximum allowed time, the receiver needs to re-measure the synchronization reference terminal. At this point, it is necessary to distinguish whether the synchronization reference terminal is lost or fails to transmit SLSS due to LBT failure, thereby determining whether the receiver should stop the measurement or continue to re-measure. In the case of stopped measurement, it is further distinguished whether the synchronization reference terminal has been selected as a synchronization source or is a candidate synchronization source, and the receiver's behavior is given accordingly.

[0151] (3) For PSBCH-RSRP evaluation period:

[0152] a. Extension parameter of the evaluation time period x_max=2*y_max (used to extend the measurement time period).

[0153] b. When the required evaluation period exceeds the maximum allowed time, the receiver determines whether to send an SLSS based on whether the synchronization reference terminal is lost or failed to send an SLSS due to an LBT failure. In the latter case, the receiver can further determine whether to send an SLSS based on its previous behavior, capabilities, network configuration, synchronization source, and other factors.

[0154] 4 shows a schematic diagram of a system architecture of a communication system 400 provided in one embodiment of the present application. The system architecture may include: a terminal 10 , an access network device 20 , and a core network device 30 .

[0155] The terminal 10 may refer to a UE (User Equipment), an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a wireless communication device, a user agent, or a user apparatus. Alternatively, the terminal may be a cellular phone, a cordless phone, a SIP (Session Initiation Protocol) phone, a WLL (Wireless Local Loop) station, a PDA (Personal Digital Assistant), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, an in-vehicle device, a wearable device, a terminal in a 5GS (5th Generation System) or a terminal in a future-evolved PLMN (Public Land Mobile Network), etc., and the embodiments of the present application are not limited thereto. For the convenience of description, the above-mentioned devices are collectively referred to as terminals.

[0156] It should be noted that there are usually multiple terminals 10. One or more terminals 10 can be distributed within each cell managed by the access network device 20. Furthermore, one or more terminals 10 can also be distributed outside the cell managed by the access network device 20. Different terminals 10 can communicate with each other based on sidelinks.

[0157] Access network equipment 20 is a device deployed in an access network to provide wireless communication capabilities for terminal 10. Access network equipment 20 may include various forms of macro base stations, micro base stations, relay stations, access points, and the like. In systems employing different wireless access technologies, the names of devices that provide access network equipment functions may vary. For example, in 5G NR systems, they are referred to as gNodeBs or gNBs. As communication technologies evolve, the term "access network equipment" may change. For ease of description, in the embodiments of this application, the aforementioned devices that provide wireless communication capabilities for terminal 10 are collectively referred to as access network equipment. Optionally, a communication relationship can be established between terminal 10 and core network equipment 30 through access network equipment 20. For example, in a Long Term Evolution (LTE) system, access network equipment 20 may be an Evolved Universal Terrestrial Radio Access Network (EUTRAN) or one or more eNodeBs in EUTRAN; in a 5G NR system, access network equipment 20 may be a RAN or one or more gNBs in the RAN.

[0158] The core network equipment 30 primarily provides user connectivity, user management, and service bearering, serving as a bearer network interface to external networks. For example, the core network equipment in a 5G NR system may include devices such as an AMF (Access and Mobility Management Function) entity, a UPF (User Plane Function) entity, and an SMF (Session Management Function) entity. The access network equipment 20 and the core network equipment 30 may be collectively referred to as network equipment.

[0159] In one example, the access network device 20 and the core network device 30 communicate with each other via an air technology, such as the NG interface in a 5G NR system. The access network device 20 and the terminal 10 communicate with each other via an air technology, such as the Uu interface. The terminals 10 communicate with each other via an air technology, such as the PC5 interface.

[0160] FIG5 is a flow chart of a detection method provided by an exemplary embodiment of the present application. The method may be executed by a sideline terminal. The method includes:

[0161] Step 502: If the first sampling result within the detection time period does not meet the first condition, extend the detection time period.

[0162] A sidelink terminal is a terminal that supports sidelink communication. In some embodiments, the sidelink terminal is a V2X terminal.

[0163] The detection time period is used by the sideline terminal to detect the synchronization source through the SL-U. It should be noted that the detection in the embodiment of the present application is equivalent to / can be replaced by: discovery / detection.

[0164] In some embodiments, the types of objects that can serve as synchronization sources include at least one of GNSS, cells, and synchronization reference terminals. The synchronization reference terminal can be synchronized directly or indirectly to the GNSS or the cell. In some embodiments, the cell includes at least one of an NR cell and an EUTRAN cell. Each type of synchronization source corresponds to a synchronization source priority. In some embodiments, the synchronization source priority of GNSS is higher than that of the cell, that is, the synchronization source with the highest synchronization source priority is GNSS. In some embodiments, the synchronization source priority of the cell is higher than that of GNSS. In some embodiments, the synchronization source priority of the synchronization reference terminal can refer to the synchronization source priority of its current synchronization source, but its priority is lower than its current synchronization source.

[0165] In some embodiments, a sidewalk terminal's current synchronization source is a synchronization reference terminal, and the synchronization source to which the synchronization reference terminal is directly or indirectly synchronized is synchronized with the synchronization source with the highest synchronization source priority. This scenario is referred to as a synchronization scenario. For example, the sidewalk terminal's current synchronization source is a synchronization reference terminal that is directly or indirectly synchronized to a GNSS.

[0166] In some embodiments, the sideline terminal's current synchronization source is a synchronization reference terminal, and the synchronization source to which the synchronization reference terminal is directly or indirectly synchronized differs from the synchronization source with the highest synchronization source priority. This scenario is referred to as an asynchronous scenario. For example, the sideline terminal's current synchronization source is directly or indirectly synchronized to a cell. The type of the sideline terminal's current synchronization source affects the detection time period, as described below.

[0167] In some embodiments, the detection time period includes one or more basic detection time periods. In some embodiments, the basic detection time period includes at least one of the following:

[0168] One or more SLSS cycles;

[0169] One or more S-SSB periods;

[0170] One or more SL-DRX cycles.

[0171] In some embodiments, the basic detection period includes multiple SLSS cycles. In some embodiments, the basic detection period includes multiple S-SSB cycles. In some embodiments, the basic detection period includes multiple SL-DRX cycles.

[0172] It should be noted that the detection time period in the embodiment of the present application is equivalent to / can be replaced by the detection time, and the basic detection time period is equivalent to / can be replaced by the basic detection time, the detection time unit, and the detection time unit. The embodiment of the present application does not limit this. It should be noted that in the embodiment of the present application, S-SSB is equivalent to / can be replaced by SLSS.

[0173] In some embodiments, when the detection time period is not extended, the detection time period includes one or more basic detection time periods, for example, only one basic detection time period. The basic detection time period is used to extend the detection time period, for example, the detection time period is extended in units of the basic detection time period. It can be understood that the basic detection time period is the basic unit for extending the detection time period. The process of extending the detection time period can be described below.

[0174] In some embodiments, each basic detection time period includes one or more detection cycles. The detection cycle includes at least one of an SLSS cycle, an S-SSB cycle, and an SL-DRX cycle. In some embodiments, the first sampling result includes a sampling result for a synchronization signal, which is sent by a synchronization source and is used to detect the synchronization source. In some embodiments, the sampling result is equivalent to / can be replaced by a detection result. The synchronization signal includes at least one of the following:

[0175] SLSS;

[0176] ·S-SSB.

[0177] In some embodiments, when the current synchronization source of the sideline terminal is a synchronization reference terminal, and the synchronization reference terminal is directly or indirectly synchronized to a synchronization source with the highest synchronization source priority (for example, GNSS is configured as the highest priority, and the synchronization reference terminal is directly or indirectly synchronized to GNSS), the basic detection time period includes 10 SLSS cycles, for example, 10*160ms, i.e., 1.6s.

[0178] In some embodiments, when the current synchronization source of the sideline terminal is a synchronization reference terminal, and the synchronization source to which the synchronization reference terminal is directly or indirectly synchronized is different from the synchronization source timing of the highest synchronization source priority (for example, GNSS is configured as the highest priority, and the synchronization reference terminal is directly or indirectly synchronized to the cell; or the cell is configured as the highest priority, and the synchronization reference terminal is synchronized to the cell or GNSS), the basic detection time period includes 50 SLSS cycles, for example, 50*160ms, i.e., 8s.

[0179] Regarding the situation where the testing period is gradually extended based on the sampling results:

[0180] In some embodiments, the detection time period includes multiple basic detection time periods. In some embodiments, the non-extended detection time period includes a basic detection time period. In this case, the detection time period includes multiple basic detection time periods, which is obtained by extending the non-extended detection time period. In this case, the detection time period including multiple basic detection time periods is an extended detection time period. For example, the detection time period includes two basic detection time periods, one of which is the basic detection time period included in the detection time period when it is not extended, and the other basic detection time period is used to extend the detection time period. In some embodiments, the detection time period can also include a basic detection time period. In this case, the detection time period is not extended. For the extension of the detection time period, it can also be performed with reference to the following scheme.

[0181] The first sampling result is determined based on the second sampling result of one or more (each) basic detection time periods in multiple basic detection time periods. In this solution, the sideline terminal will merge the second sampling results in different basic detection time periods to determine whether the detection time period needs to be extended. In the solution mentioned in the background introduction, when determining whether to extend the detection time period, only the sampling results in the most recently extended basic detection time period are considered, and the sampling results in the previous basic detection time periods are completely discarded. The above solution in the embodiment of the present application can reduce the detection time period used by the sideline terminal, thereby reducing terminal overhead.

[0182] In some embodiments, if the first sampling result within the detection period does not meet the first condition, the sideline terminal will extend the detection period by m basic detection period times, where m is a positive integer. In some embodiments, m is equal to 1. That is, each time the detection period is extended, only one basic detection period is extended. It should be noted that the number of basic detection period times used in each detection period extension can be the same or different.

[0183] In some embodiments, when the first sampling result within the detection time period meets the first condition, the sideline terminal stops extending the detection time period and determines that the synchronization source is detected.

[0184] In some embodiments, the first sampling result includes a sampling result for the synchronization signal. Each basic detection time period is used to sample the synchronization signal n times, where n is a positive integer. In some embodiments, n is equal to 3. In some embodiments, when sampling the synchronization signal in the basic detection time period, the sideline terminal randomly selects n detection cycles, thereby performing n sampling times. It should be noted that although the sideline terminal performs n sampling times, the actual number of sampling times may be affected by the actual situation of the synchronization source, resulting in the actual number of sampling times in the basic detection time period not reaching n times.

[0185] In some embodiments, the synchronization signal includes at least one of SLSS and S-SSB.

[0186] In some embodiments, the first condition includes at least one of the following:

[0187] The cumulative number of sampling times of the synchronization signal during the detection period is greater than or equal to the second parameter;

[0188] The time interval between two adjacent synchronization signal samples shall not exceed the third parameter.

[0189] In some embodiments, two adjacent synchronization signal samples refer to any two adjacent synchronization signal samples among multiple synchronization signal samples that meet the cumulative sampling number.

[0190] In some embodiments, the second parameter is determined by at least one of the following methods:

[0191] The second parameter is preset;

[0192] The second parameter is determined according to the terminal capability;

[0193] The second parameter is the network device configuration.

[0194] In some embodiments, the third parameter is determined by at least one of the following methods:

[0195] The third parameter is preset;

[0196] The third parameter is determined according to the terminal capabilities;

[0197] The third parameter is the network device configuration.

[0198] In some embodiments, the number of extensions corresponding to the detection time period is less than the first parameter, i.e., the number of extensions for the detection time period should not exceed the limit of the first parameter. The number of extensions is the cumulative number of times the detection time period extends the basic detection time period. The number of extensions is equivalent to / can be replaced by the number of extensions, which is the cumulative number of times the detection time period extends the basic detection time period.

[0199] In some embodiments, when the number of extensions is greater than a first parameter, the sideline terminal determines that the synchronization source is not detected.

[0200] In some embodiments, the first parameter is related to the SL-DRX configuration. In some embodiments, when the SL-DRX mode is not in operation or the SL-DRX cycle is less than the first value, the first parameter has a first value. In some embodiments, when the SL-DRX cycle is greater than the first value, the first parameter has a second value. In some embodiments, the first value is different from the second value, for example, the first value is greater than the second value.

[0201] In some embodiments, the first parameter is related to the synchronization source priority of the current synchronization source of the sideline terminal. In some embodiments, when the current synchronization source of the sideline terminal is a synchronization reference terminal, and the synchronization source to which the synchronization reference terminal is directly or indirectly synchronized is synchronized with the synchronization source with the highest synchronization source priority, the first parameter is a first value. In some embodiments, when the current synchronization source of the sideline terminal is a synchronization reference terminal, and the synchronization source to which the synchronization reference terminal is directly or indirectly synchronized is different in timing from the synchronization source with the highest synchronization source priority, the first parameter is a third value. In some embodiments, the third value is different from the first value and the second value, for example, the third value is greater than the first value.

[0202] It should be noted that for the first parameter, the second parameter, and the third parameter in the above two cases of the synchronous scenario and the asynchronous scenario, they can be completely the same, partially the same, or completely different. Exemplarily, for the above synchronous scenario, the detection time period can be expressed as T detect =(1.6 + 1.6 * x1). Here, x1 is the number of extensions in the synchronous scenario, x1 < x1_max, and x1_max is the first parameter in the synchronous scenario. For the above asynchronous scenario, T detect =(8 + 8 * x2). Here, x2 is the number of extensions in the asynchronous scenario, x2 < x2_max, and x2_max is the first parameter in the asynchronous scenario.

[0203] For the case of directly extending to the maximum detection time period:

[0204] In some embodiments, when the first sampling result within the detection time period does not meet the first condition, the sidelink terminal will extend the detection time period by the first parameter of the basic detection time periods, and the extended detection time period includes (the first parameter + 1) basic detection time periods. In some embodiments, the detection time period before extension only includes one basic detection time period.

[0205] In some embodiments, the first sampling result includes the sampling result for the synchronization signal. Each basic detection time period includes one or more detection cycles. In some embodiments, the detection cycle includes at least one of the SLSS cycle, the S-SSB cycle, and the SL-DRX cycle. Within (the first parameter + 1) basic detection time periods, the sidelink terminal will select (1 + the first parameter) * n detection cycles for synchronization signal sampling, where n is a positive integer. In some embodiments, the number of detection cycles selected by the sidelink terminal in different basic detection time periods is the same or different. In some embodiments, n is equal to 3. In some embodiments, the sidelink terminal randomly selects (1 + the first parameter) * n detection cycles within the detection time period. In some embodiments, the above synchronization signal includes at least one of SLSS and S-SSB.

[0206] In some embodiments, when the sampling result within (the first parameter + 1) basic detection time periods does not meet the first condition, the sidelink terminal determines that the synchronization source has not been detected.

[0207] In some embodiments, the first condition includes at least one of the following:

[0208] · The cumulative number of samplings of the synchronization signal within the detection time period is greater than or equal to the second parameter;

[0209] · The time interval between two adjacent samplings of the synchronization signal does not exceed the third parameter.

[0210] In the above solution, when sampling the synchronization signal, the sideline terminal can select different numbers of detection cycles for different basic detection time periods. Furthermore, the sideline terminal can combine the sampling results from different basic detection time periods to determine whether the synchronization source has been detected based on the first condition. In contrast, in the solution mentioned in the background introduction, when sampling the synchronization signal, the same number of detection cycles is selected for different basic detection time periods, and only the sampling results from a specific basic detection time period are considered. The above solution in the embodiment of the present application can improve the flexibility of synchronization signal sampling, thereby increasing the likelihood of detecting the synchronization source.

[0211] In some embodiments, the first parameter is related to the sidelink discontinuous reception (SL-DRX) configuration. In some embodiments, in the case of non-SL-DRX or when the SL-DRX cycle is less than the first value, the first parameter is a first value. In some embodiments, in the case of the SL-DRX cycle being greater than the first value, the first parameter is a second value. In some embodiments, the first parameter is related to the synchronization source priority of the terminal's current synchronization source.

[0212] In some embodiments, the second parameter is determined by at least one of the following methods:

[0213] The second parameter is preset;

[0214] The second parameter is determined according to the terminal capability;

[0215] The second parameter is the network device configuration.

[0216] In some embodiments, the third parameter is determined by at least one of the following methods:

[0217] The third parameter is preset;

[0218] The third parameter is determined according to the terminal capabilities;

[0219] The third parameter is the network device configuration.

[0220] It should be noted that the first parameter, the second parameter, and the third parameter in the two cases of gradually extending the detection time period according to the sampling results and directly extending it to the maximum detection time period can be completely the same, partially the same, or completely different. For example, for the above synchronization scenario, the maximum detection time period can be expressed as T detect =(1.6+1.6*x1_max). Where x1_max is the first parameter in the synchronous scenario. For the asynchronous scenario above, T detect =(8+8*x2_max), where x2_max is the first parameter in the asynchronous scenario.

[0221] In some embodiments, the third condition is used by the sideline terminal to determine whether to extend the detection time period. The third condition includes at least one of the following:

[0222] The cumulative number of sampling times of the synchronization signal during the detection period is less than the second parameter;

[0223] The time interval between two adjacent synchronization signal samples exceeds the third parameter.

[0224] In some embodiments, when the first sampling result within the detection time period meets the third condition, the sideline terminal will extend the detection time period. For the implementation of extending the detection time period, and the implementation of the extension of the detection time period being restricted by the first parameter, please refer to the relevant descriptions in the synchronous scenario and the asynchronous scenario above, and the embodiments of the present application will not be described in detail here. In some embodiments, in the above-mentioned synchronous scenario, when the first sampling result within the detection time period does not meet the third condition, the sideline terminal will stop extending the detection time period and determine that the synchronization source is detected. For the relevant parameters in the third condition, please refer to the description above, and the embodiments of the present application will not be described in detail here.

[0225] To sum up, the method provided in this embodiment clarifies the method for extending the detection time period when detecting the synchronization source in SL-U, thereby clarifying the method for determining the detection time period in SL-U and providing an implementation method for detecting the synchronization source in SL-U.

[0226] FIG6 is a flow chart of a measurement method provided by an exemplary embodiment of the present application. The method may be executed by a sideline terminal. The method includes:

[0227] Step 602: During measurement of the first synchronization source of the SL-U, if the second condition is met, it is determined that the first synchronization source is unavailable.

[0228] In some embodiments, the second condition includes at least one of the following:

[0229] No measurement results were obtained for the fourth maximum measurement period in a row. The maximum measurement period was obtained by extending the measurement period by the fifth parameter.

[0230] No measurement result is obtained for the sixth consecutive measurement period, where each measurement period includes multiple measurement periods.

[0231] No measurement result was obtained within the first time period.

[0232] In some embodiments, the maximum measurement time period includes multiple measurement cycles. In some embodiments, the measurement cycle includes at least one of an SLSS cycle, an S-SSB cycle, and an SL-DRX cycle. In some embodiments, when the sideline terminal does not measure a measurement result within the non-extended measurement time period, it will extend the measurement time period in units of measurement cycles and continue measuring. Thereafter, when the measurement time period is extended to the maximum measurement time period and still no measurement result is measured, the sideline terminal may perform measurements again in the above manner. In some embodiments, the above-mentioned second condition is used to determine whether to stop measuring the first synchronization source.

[0233] In some embodiments, not measuring a measurement result may also mean not measuring a sufficient number of measurement results, that is, the actual number of measurements does not meet the required number of measurements. Measuring a measurement result may also mean measuring a sufficient number of measurement results, that is, the actual number of measurements meets the required number of measurements.

[0234] In some embodiments, the maximum measurement time period is obtained by extending the measurement time period by a maximum number of measurement cycles. In some embodiments, measuring the first synchronization source refers to measuring the PSBCH-RSRP of the first synchronization source.

[0235] In some embodiments, the maximum measurement time period can be expressed as (2+y_max)*160 or (2+y_max)*SL-DRX cycle. 160 refers to the SLSS cycle. y_max represents the maximum number of extensions, that is, the maximum number of measurement cycles extended based on 2 measurement cycles (the measurement time period when not extended). The maximum number of extensions is equivalent to / can be replaced by the maximum number of extensions, that is, the maximum number of times the measurement cycle is extended (one measurement cycle each time) based on 2 measurement cycles (the measurement time period when not extended). In some embodiments, y_max=2.

[0236] In some embodiments, the fourth parameter is determined by at least one of the following methods:

[0237] The fourth parameter is preset;

[0238] The fourth parameter is determined according to the terminal capabilities;

[0239] The fourth parameter is for network device configuration;

[0240] The fourth parameter is determined according to the synchronization source priority or type of the first synchronization source;

[0241] The fourth parameter is determined according to the synchronization source priority or type of the synchronization source currently selected by the terminal.

[0242] In some embodiments, the sixth parameter is determined by at least one of the following methods:

[0243] The sixth parameter is preset;

[0244] The sixth parameter is determined according to the terminal capability;

[0245] The sixth parameter is for network device configuration;

[0246] The sixth parameter is determined according to the synchronization source priority or type of the first synchronization source;

[0247] The sixth parameter is determined according to the synchronization source priority or type of the synchronization source currently selected by the terminal.

[0248] In some embodiments, the first duration is determined by at least one of the following methods:

[0249] The first duration is preset;

[0250] The first duration is determined based on the terminal's capabilities;

[0251] The first duration is configured by the network device;

[0252] The first duration is determined according to the synchronization source priority or type of the first synchronization source;

[0253] The first duration is determined according to the synchronization source priority or type of the synchronization source currently selected by the terminal.

[0254] It should be noted that the determination methods of the fourth parameter, the sixth parameter and the first duration in the embodiments of the present application are exactly the same, partially the same, or completely different.

[0255] In some embodiments, the first synchronization source is a synchronization reference terminal. In the related art, when the sideline terminal measures the first synchronization source, the extension parameter of its measurement time period may exceed the maximum extension parameter due to LBT failure / the synchronization reference terminal is no longer in the current area (invisible). In this case, the sideline terminal in the related art will endlessly remeasure the first synchronization source, resulting in a large overhead for the sideline terminal. In order to avoid endless repeated measurements of the same synchronization source, the method provided in the embodiment of the present application introduces the above-mentioned second condition to terminate the measurement of the synchronization source, and provides the behavior of the sideline terminal when the second condition is met. The content is as follows:

[0256] If the primary synchronization source is unavailable:

[0257] In some embodiments, when the first synchronization source is unavailable (satisfying the second condition can be regarded as the first synchronization source being out of the current area (invisible), rather than LBT failure), the sideline terminal stops measuring the first synchronization source.

[0258] In some embodiments, when the first synchronization source is the synchronization source currently selected by the sideline terminal, the sideline terminal triggers synchronization source detection.

[0259] In some embodiments, when the first synchronization source is the synchronization source currently selected by the sideline terminal, the sideline terminal status changes from having the first synchronization source (synchronization reference terminal) as the synchronization source to having no synchronization source.

[0260] In some embodiments, when the first synchronization source is the synchronization source currently selected by the sideline terminal, before the sideline terminal selects the second synchronization source, the sideline terminal will trigger the transmission of a synchronization signal according to local timing. In some embodiments, the synchronization signal includes at least one of SLSS and S-SSB.

[0261] In some embodiments, when the first synchronization source is a candidate synchronization source, the sideline terminal detects and measures the second synchronization source.

[0262] Available for the first synchronization source:

[0263] In some embodiments, during measurement of the first synchronization source, if the second condition is not met (it can be considered that the first synchronization source is still in the current area (visible), but cannot be measured due to too many LBT failures), the sideline terminal will determine that the first synchronization source is available.

[0264] In some embodiments, when the first synchronization source is available, the sideline terminal will continue to measure the first synchronization source. In this case, it may not be considered whether the first synchronization source has been selected as a synchronization source or a candidate synchronization source.

[0265] In some embodiments, the fourth condition is used by the sideline terminal to determine whether the first synchronization source is available based on the measurement of the first synchronization source. The fourth condition includes at least one of the following:

[0266] The measurement results are obtained for the fourth consecutive maximum measurement time period;

[0267] The measurement results are obtained for the sixth parameter measurement cycle in a row;

[0268] The measurement result is measured within the first time period.

[0269] In some embodiments, during measurement of the first synchronization source of the SL-U, if the fourth condition is not met, the sideline terminal determines that the first synchronization source is unavailable. In some embodiments, during measurement of the first synchronization source of the SL-U, if the fourth condition is met, the sideline terminal determines that the first synchronization source is available. The sideline terminal's behavior when the first synchronization source is available and unavailable, as well as the relevant parameters in the fourth condition, can be found in the previous description and are not further described in the present embodiments.

[0270] In summary, the method provided in this embodiment can determine whether the synchronization source measured by the sidelink terminal is available by providing a second condition, and then determine whether to stop measuring the synchronization source based on the judgment result. It can avoid endless repeated measurement of the same synchronization source and reduce the overhead of the sidelink terminal.

[0271] FIG. 7 is a flowchart of an evaluation method provided by an exemplary embodiment of the present application. This method can be executed by a sidelink terminal. The method includes:

[0272] Step 702: Extend the evaluation time period by a seventh parameter.

[0273] This evaluation time period is used to evaluate the measurement results of the currently selected synchronization source in SL-U. The evaluation result is used to trigger the transmission of the synchronization signal of the sidelink terminal. That is, the sidelink terminal determines whether to transmit the synchronization signal according to the evaluation result. In some embodiments, the synchronization signal includes at least one of SLSS and S-SSB. The seventh parameter is related to the fifth parameter, and the fifth parameter is used to extend the measurement time period to the maximum measurement time period, and the measurement time period is used to measure the synchronization source. For the introduction of the measurement time period and the fifth parameter, reference can be made to the embodiment shown in FIG. 6, and the present application will not elaborate here.

[0274] In some embodiments, the seventh parameter is an even multiple of the fifth parameter. In some embodiments, the seventh parameter is 2 times the fifth parameter.

[0275] The evaluation time period includes multiple evaluation cycles. In some embodiments, the evaluation cycle includes at least one of an SLSS cycle, an S-SSB cycle, and an SL-DRX cycle. In some embodiments, when the sidelink terminal cannot evaluate the measurement results of the synchronization source within the unextended evaluation time period, it will extend the evaluation time period in units of the evaluation cycle and continue to evaluate to determine whether to trigger the transmission of the synchronization signal of the sidelink terminal.

[0276] In some embodiments, the evaluation time period can be expressed as (4 + x) * synchronization signal cycle or (4 + x) * SL-DRX cycle. x represents the number of extended evaluation cycles, that is, based on 4 evaluation cycles (the evaluation time period without extension), the number of extended evaluation cycles. This extension number is equivalent to / replaceable with the extension times, that is, based on 4 evaluation cycles, the maximum number of times to extend the evaluation cycle (each time extending one evaluation cycle). Among them, x < x_max. x_max represents the maximum number of extended evaluation cycles. In some embodiments, x_max = 2 * y_max, and y_max represents the above-mentioned fifth parameter.

[0277] For the case where the evaluated synchronization source is unavailable:

[0278] In some embodiments, when the synchronization source is unavailable (which can be considered as the synchronization source (synchronization reference terminal) is no longer in the current area (invisible), rather than LBT failure), the sideline terminal will think that there is no synchronization source, and the sideline terminal will trigger the synchronization signal transmission.

[0279] For situations where an evaluation synchronization source is available but measurement results are unreliable:

[0280] In some embodiments, the availability of the synchronization source can be divided into two cases: (1) The synchronization source can be measured every time. In this case, the sideline terminal directly compares the measured RSRP result with the threshold value to determine whether to send a synchronization signal. (2) Although the RSRP result of the synchronization source is measured, the measurement of the synchronization source does not meet the measurement requirements (that is, the measurement result is unreliable). In some embodiments, failure to meet the measurement requirements includes the actual number of measurements of the synchronization source being less than the required number of measurements. For example, 4 cycles are required to be measured, but only 2 are measured. The following sideline terminal behavior provided in the embodiment of the present application can be used for the above-mentioned case (2). It should be noted that for the above-mentioned case (1), the following sideline terminal behavior provided in the embodiment of the present application can also be used.

[0281] In some embodiments, if the synchronization source is available (this can be considered as the synchronization source still being in the current area (visible), but due to excessive LBT failures, the measurement results cannot be accurately evaluated), the sideline terminal will maintain the current synchronization signal transmission behavior. For example, if it previously determined based on reliable measurement results that synchronization signals needed to be transmitted, the sideline terminal will continue to transmit. Alternatively, the sideline terminal may determine whether to transmit synchronization signals based on the latest valid measurement results. In some embodiments, the measurement result is PSBCH-RSRP.

[0282] In some embodiments, when a synchronization source is available, the sideline terminal determines whether to transmit a synchronization signal based on its capabilities. In some embodiments, this terminal capability is an existing terminal capability. For example, a sideline terminal requiring energy conservation may choose not to transmit a synchronization signal. In some embodiments, this terminal capability is a newly introduced terminal capability for this scenario.

[0283] In some embodiments, when a synchronization source is available, the sideline terminal determines whether to transmit a synchronization signal based on pre-configuration information or signaling from a network device.

[0284] In some embodiments, when a synchronization source is available, the sideline terminal determines whether to transmit a synchronization signal based on the synchronization source priority or type of the synchronization source. In some embodiments, if the synchronization source priority of the synchronization source is higher than a priority threshold, the synchronization signal is transmitted; if the synchronization source priority of the synchronization source is lower than the priority threshold, the synchronization signal is not transmitted.

[0285] In some embodiments, the priority threshold is determined by at least one of the following methods:

[0286] Priority thresholds are preset;

[0287] Priority thresholds are determined based on terminal capabilities;

[0288] Priority thresholds are configured on network devices.

[0289] In some embodiments, when a synchronization source is available, the sideline terminal may utilize currently inaccurate measurements to evaluate whether to transmit a synchronization signal.

[0290] In some embodiments, when the synchronization source is available, the sending of the synchronization signal is triggered, that is, the sending of the synchronization signal is triggered regardless of the value of the measurement result.

[0291] In some embodiments, the above-mentioned behaviors of the sideline terminal when a synchronization source is available can be freely combined and applied. For example, the sideline terminal will only send a synchronization signal when both the signaling configuration and priority conditions are met. If either condition is not met, no synchronization signal will be sent.

[0292] For the implementation of the above-mentioned determination of whether the synchronization source is available, reference may be made to the second condition in the embodiment shown in FIG6 , which is not described in detail in this application. It should be noted that in the process of evaluating whether the synchronization source is available, when using the second condition in the embodiment shown in FIG6 for determination, the same or different parameters as those used for the second condition in the embodiment shown in FIG6 may be used.

[0293] In summary, the method provided in this embodiment clarifies how to determine the evaluation period in the SL-U by clarifying how to extend the evaluation period when evaluating the synchronization source in the SL-U. By associating the extension of the evaluation period with the measurement period, this provides a method for rationally setting the evaluation period, helping to clarify the relevant behavior of the sideline terminal through the evaluation of the evaluation period.

[0294] The method provided in the embodiment of the present application provides a method for determining the time period and terminal behavior for three RRM-related processes in SL-U, including:

[0295] (1) Detection of synchronization source-related schemes;

[0296] (2) Schemes for measuring synchronization source correlation;

[0297] (3) Methods for evaluating synchronization source correlation.

[0298] Regarding the above solution (1) - gradually extending the detection time period. FIG8 is a flow chart of a detection method provided by an exemplary embodiment of the present application. The method can be executed by a sideline terminal. The method includes:

[0299] Step 802: If the first sampling result within the detection time period does not satisfy the first condition, the detection time period is extended by m basic detection time periods.

[0300] m is a positive integer. The detection time period is used by the sideline terminal to detect the synchronization source through the SL-U. It should be noted that the detection in the embodiment of the present application is equivalent to / can be replaced by: discovery / detection.

[0301] The detection time period includes multiple basic detection time periods. In some embodiments, the basic detection time period includes at least one of the following:

[0302] One or more SLSS cycles;

[0303] One or more S-SSB periods;

[0304] One or more SL-DRX cycles.

[0305] In some embodiments, when the detection time period is not extended, the detection time period includes one or more basic detection time periods, for example, only one basic detection time period. The basic detection time period is used to extend the detection time period, for example, the detection time period is extended in units of the basic detection time period. The process of extending the detection time period is described below.

[0306] In some embodiments, each basic detection time period includes one or more detection cycles. The detection cycle includes at least one of an SLSS cycle, an S-SSB cycle, and an SL-DRX cycle. In some embodiments, the first sampling result includes a sampling result for a synchronization signal, which is sent by a synchronization source and is used to detect the synchronization source. The synchronization signal includes at least one of the following:

[0307] SLSS;

[0308] ·S-SSB.

[0309] In some embodiments, if the unextended detection time period includes a basic detection time period, then the detection time period includes multiple basic detection time periods, which is obtained by extending the unextended detection time period. In this case, the detection time period including multiple basic detection time periods is an extended detection time period. For example, the detection time period includes two basic detection time periods, one of which is the basic detection time period included in the detection time period when it is not extended, and the other basic detection time period is used to extend the detection time period. In some embodiments, the detection time period can also include a basic detection time period. In this case, the detection time period is not extended. For the extension of the detection time period, the following scheme can also be referred to.

[0310] The first sampling result is determined based on the second sampling result of one or more (each) basic detection time periods in multiple basic detection time periods. In this solution, the sideline terminal will merge the second sampling results in different basic detection time periods to determine whether the detection time period needs to be extended. In the solution mentioned in the background introduction, when determining whether to extend the detection time period, only the sampling results in the most recently extended basic detection time period are considered, and the sampling results in the previous basic detection time periods are completely discarded. The above solution in the embodiment of the present application can reduce the detection time period used by the sideline terminal, thereby reducing terminal overhead.

[0311] In some embodiments, m is equal to 1. That is, each time the detection time period is extended, only one basic detection time period is extended. It should be noted that the number of basic detection time periods used for each extension of the detection time period can be the same or different.

[0312] In some embodiments, when the first sampling result within the detection time period meets the first condition, the sideline terminal stops extending the detection time period and determines that the synchronization source is detected.

[0313] In some embodiments, the first sampling result includes a sampling result for the synchronization signal. Each basic detection time period is used to sample the synchronization signal n times, where n is a positive integer. In some embodiments, n is equal to 3. In some embodiments, when sampling the synchronization signal in the basic detection time period, the sideline terminal randomly selects n detection cycles, thereby performing n sampling times. It should be noted that although the sideline terminal performs n sampling times, the actual number of sampling times may be affected by the actual situation of the synchronization source, resulting in the actual number of sampling times in the basic detection time period not reaching n times.

[0314] In some embodiments, the synchronization signal includes at least one of SLSS and S-SSB.

[0315] In some embodiments, the first condition includes at least one of the following:

[0316] The cumulative number of sampling times of the synchronization signal during the detection period is greater than or equal to the second parameter;

[0317] The time interval between two adjacent synchronization signal samples shall not exceed the third parameter.

[0318] In some embodiments, two adjacent synchronization signal samples refer to any two adjacent synchronization signal samples among multiple synchronization signal samples that meet the cumulative sampling number.

[0319] In some embodiments, the second parameter is determined by at least one of the following methods:

[0320] The second parameter is preset;

[0321] The second parameter is determined according to the terminal capability;

[0322] The second parameter is the network device configuration.

[0323] In some embodiments, the third parameter is determined by at least one of the following methods:

[0324] The third parameter is preset;

[0325] The third parameter is determined according to the terminal capabilities;

[0326] The third parameter is the network device configuration.

[0327] In some embodiments, the number of extensions corresponding to the detection time period is less than the first parameter, i.e., the number of extensions for the detection time period should not exceed the limit of the first parameter. The number of extensions is the cumulative number of times the detection time period extends the basic detection time period. The number of extensions is equivalent to / can be replaced by the number of extensions, which is the cumulative number of times the detection time period extends the basic detection time period.

[0328] In some embodiments, the first parameter is related to the SL-DRX configuration. In some embodiments, when the SL-DRX mode is not in operation or the SL-DRX cycle is less than the first value, the first parameter has a first value. In some embodiments, when the SL-DRX cycle is greater than the first value, the first parameter has a second value. In some embodiments, the first value is different from the second value, for example, the first value is greater than the second value.

[0329] In some embodiments, the first parameter is related to the synchronization source priority of the current synchronization source of the sideline terminal. In some embodiments, when the current synchronization source of the sideline terminal is a synchronization reference terminal, and the synchronization source to which the synchronization reference terminal is directly or indirectly synchronized is synchronized with the synchronization source with the highest synchronization source priority, the first parameter is a first value. In some embodiments, when the current synchronization source of the sideline terminal is a synchronization reference terminal, and the synchronization source to which the synchronization reference terminal is directly or indirectly synchronized is different in timing from the synchronization source with the highest synchronization source priority, the first parameter is a third value. In some embodiments, the third value is different from the first value and the second value, for example, the third value is greater than the first value.

[0330] Step 804: When the extension times are greater than the first parameter, it is determined that no synchronization source is detected.

[0331] In a real-world example, for a synchronization scenario where GNSS is the highest priority synchronization source and the current synchronization source of the sideline terminal is another synchronization reference terminal that is directly or indirectly synchronized to GNSS, the sideline terminal only needs to search for other synchronization sources.

[0332] For the extension of the detection time period, the detection time period is extended by 1.6s (basic detection time period), and the detection time period in SL-U can be expressed as T detect =(1.6+1.6*x1). For the extension process of the detection time period, the side terminal gradually extends the detection time period according to the sampling results of the synchronization signal, and sets the stop condition for extending the detection time period. The side terminal maintains that 3 detection cycles (S-SSB cycles) are randomly selected within 1.6s for detection, and the maximum synchronization signal transmission discarding (SLSS Tx dropping) probability within each 1.6s is 30%. However, the detection stop condition is that the side terminal obtains a reliable / valid S-SSB detection result (meets the first condition). First, let x1=0. The side terminal first selects 3 detection cycles for detection within the first 1.6s. If the number of available detection cycles is less than 3, then x1=x1+1, and the side terminal starts detection within the second 1.6s, and also arbitrarily selects 3 detection cycles. Stop until a reliable / valid sampling result is detected or x1 exceeds x1_max. The conditions that need to be met for reliable / valid sampling results include at least one of the following:

[0333] The number of sampling times is greater than or equal to Ns, where Ns is a fixed value, such as 3. Alternatively, Ns is determined by the terminal's capabilities and configuration. Generally, the value of Ns is greater than or equal to 2.

[0334] The interval between two consecutive samples must be less than Tmax, for example, Tmax = 1.6s. Alternatively, Tmax is determined by the terminal's capabilities and configuration to ensure the effectiveness of merging multiple sampling results. (If the time interval between two samples is very large, it is likely that they were not sent by the same synchronization reference terminal, or the state of the synchronization reference terminal has changed significantly, so the two sampling results cannot be merged.)

[0335] In some embodiments, the sideline terminal can also extend the detection time period in units of detection cycles. However, this will increase the probability of interruption. In this case, the maximum extension value needs to be limited. The detection time period can be expressed as T detect =(1.6+0.16*x1) In some embodiments, x1_max=4 in this case, corresponding to a maximum interruption probability of 50%.

[0336] In an actual example, for an asynchronous scenario: GNSS is the highest synchronization source priority, and the current synchronization source of the sideline terminal is directly or indirectly synchronized to other synchronization reference terminals in the cell. In this case, the sideline terminal needs to search for other asynchronous synchronization sources.

[0337] The basic detection time period is 8s = 50*160ms detection cycle, during which 6% of V2X data and reference signal transmissions are allowed to be discarded.

[0338] The sideline terminal gradually extends the detection period based on the sampling results and sets the stop condition for extending the detection period. It maintains detection within 8 seconds by randomly selecting 3 detection cycles, and the maximum synchronization signal transmission drop (SLSS Tx dropping) probability within each 8 seconds is 6%. However, the detection stop condition is that the sideline terminal obtains reliable / valid synchronization signal sampling results. The detection period is (8+8*x2), and initially x2=0. If no reliable detection results are detected within the first 8 seconds, x2 can be increased by 1. This continues until the sideline terminal obtains a reliable sampling result (satisfying the first condition mentioned above).

[0339] In some embodiments, the sideline terminal can also extend the detection time period in units of detection cycles. However, this will increase the probability of interruption. In this case, the maximum extension value needs to be limited. The detection time period can be expressed as T detect =(8+0.16*x1) In some embodiments, x2_max=3 in this case, and the corresponding maximum interruption probability is 11.32%.

[0340] In some embodiments, different SL-DRX configurations may have different x1_max / x2_max values. For example, when there is no SL-DRX or the SL-DRX cycle is less than 320ms, x1_max / x2_max = 4; when the SL-DRX cycle is greater than 320ms, x1_max / x2_max = 2. In some embodiments, different synchronization source scenarios may have different parameter values. For example, in a synchronous scenario, x1_max = 4, and in an asynchronous scenario, x2_max = 8.

[0341] In this embodiment, step 802 and step 804 are optional. In different embodiments, one or more of these steps may be omitted or replaced.

[0342] Step 802 can be implemented as an independent embodiment, such as being implemented as a synchronization source detection method on the sideline terminal side. Step 804 can be implemented as an independent embodiment, such as being implemented as a synchronization source determination method on the sideline terminal side.

[0343] To sum up, the method provided in this embodiment clarifies the method for extending the detection time period when detecting the synchronization source in SL-U, thereby clarifying the method for determining the detection time period in SL-U and providing an implementation method for detecting the synchronization source in SL-U.

[0344] In addition, the first sampling result is determined based on the second sampling result of one or more (each) basic detection time periods in the multiple basic detection time periods. This solution can reduce the detection time period used by the sideline terminal, thereby reducing terminal overhead. Furthermore, the method provided in the embodiment of the present application clarifies the conditions for detecting the synchronization source, which can improve the accuracy of synchronization source detection.

[0345] Regarding the above solution (1) - directly extending to the maximum detection time period. FIG9 is a flow chart of a detection method provided by an exemplary embodiment of the present application. The method can be executed by a sideline terminal. The method includes:

[0346] Step 902: If the first sampling result within the detection time period does not satisfy the first condition, extend the detection time period by a first parameter number of basic detection time periods.

[0347] The detection time period is used by the sideline terminal to detect the synchronization source through the SL-U. It should be noted that the detection in the embodiment of the present application is equivalent to / can be replaced by: discovery / detection.

[0348] The extended detection time period includes the first parameter + 1 basic detection time period. In some embodiments, the basic detection time period includes at least one of the following:

[0349] One or more SLSS cycles;

[0350] One or more S-SSB periods;

[0351] One or more SL-DRX cycles.

[0352] In some embodiments, when the detection time period is not extended, the detection time period includes one or more basic detection time periods, for example, only one basic detection time period. The basic detection time period is used to extend the detection time period, for example, the detection time period is extended in units of the basic detection time period. The process of extending the detection time period is described below.

[0353] In some embodiments, each basic detection time period includes one or more detection cycles. The detection cycle includes at least one of an SLSS cycle, an S-SSB cycle, and an SL-DRX cycle. In some embodiments, the first sampling result includes a sampling result for a synchronization signal, which is sent by a synchronization source and is used to detect the synchronization source. The synchronization signal includes at least one of the following:

[0354] SLSS;

[0355] ·S-SSB.

[0356] In some embodiments, if the first sampling result within the detection time period does not meet the first condition, the sideline terminal will extend the detection time period by a first parameter number of basic detection time periods, where the extended detection time period includes (first parameter + 1) basic detection time periods. In some embodiments, the detection time period before extension includes only one basic detection time period.

[0357] In some embodiments, the first condition includes at least one of the following:

[0358] The cumulative number of sampling times of the synchronization signal during the detection period is greater than or equal to the second parameter;

[0359] The time interval between two adjacent synchronization signal samples shall not exceed the third parameter.

[0360] In the above solution, when sampling the synchronization signal, the sideline terminal can select different numbers of detection cycles for different basic detection time periods. Furthermore, the sideline terminal can combine the sampling results from different basic detection time periods to determine whether the synchronization source has been detected based on the first condition. In contrast, in the solution mentioned in the background introduction, when sampling the synchronization signal, the same number of detection cycles is selected for different basic detection time periods, and only the sampling results from a specific basic detection time period are considered. The above solution in the embodiment of the present application can improve the flexibility of synchronization signal sampling, thereby increasing the likelihood of detecting the synchronization source.

[0361] In some embodiments, the first parameter is related to the sidelink discontinuous reception (SL-DRX) configuration. In some embodiments, when the SL-DRX mode is not in operation or the SL-DRX cycle is less than the first value, the first parameter takes a first value. In some embodiments, when the SL-DRX cycle is greater than the first value, the first parameter takes a second value.

[0362] In some embodiments, the first parameter is related to the synchronization source priority of the terminal's current synchronization source. In some embodiments, when the sideline terminal's current synchronization source is a synchronization reference terminal, and the synchronization source to which the synchronization reference terminal is directly or indirectly synchronized is synchronized with the synchronization source with the highest synchronization source priority, the first parameter takes a first value. In some embodiments, when the sideline terminal's current synchronization source is a synchronization reference terminal, and the synchronization source to which the synchronization reference terminal is directly or indirectly synchronized is different in timing from the synchronization source with the highest synchronization source priority, the first parameter takes a third value. In some embodiments, the third value is different from the first value and the second value.

[0363] In some embodiments, the second parameter is determined by at least one of the following methods:

[0364] The second parameter is preset;

[0365] The second parameter is determined according to the terminal capability;

[0366] The second parameter is the network device configuration.

[0367] In some embodiments, the third parameter is determined by at least one of the following methods:

[0368] The third parameter is preset;

[0369] The third parameter is determined according to the terminal capabilities;

[0370] The third parameter is the network device configuration.

[0371] Step 904: within the first parameter+1 basic detection time period, select (1+first parameter)*n detection cycles to perform synchronization signal sampling.

[0372] n is a positive integer. In some embodiments, the first sampling result includes a sampling result for a synchronization signal. Each basic detection time period includes one or more detection cycles. In some embodiments, the detection cycle includes at least one of an SLSS cycle, an S-SSB cycle, and an SL-DRX cycle. Within (first parameter + 1) basic detection time periods, the sideline terminal will select (1 + first parameter) * n detection cycles for synchronization signal sampling, where n is a positive integer. In some embodiments, the number of detection cycles selected by the sideline terminal in different basic detection time periods is the same or different. In some embodiments, n is equal to 3. In some embodiments, the sideline terminal randomly selects (1 + first parameter) * n detection cycles within the detection time period. In some embodiments, the above-mentioned synchronization signal includes at least one of SLSS and S-SSB.

[0373] Step 906: If the sampling result within the first parameter+1 basic detection time period does not meet the first condition, it is determined that the synchronization source is not detected.

[0374] In a real-world example, for a synchronization scenario where GNSS is the highest priority synchronization source and the current synchronization source of the sideline terminal is another synchronization reference terminal that is directly or indirectly synchronized to GNSS, the sideline terminal only needs to search for other synchronization sources.

[0375] The side terminal will extend the detection period to T detect =(1.6+1.6*x1_max), x1_max is not determined by the number of basic detection time periods that actually determine failure, but is a fixed value. detectDuring this time, the sideline terminal can arbitrarily select (1+x1_max)*3 detection cycles to detect, and the probability of dropping the synchronization signal transmission remains at 30% (maintained at 30% during the entire 1.6+1.6*x1_max, but the probability of dropping within 1.6s may exceed or fall below this ratio). If the fixed extended time T detect =(1.6+1.6*x1_max) If no reliable / valid synchronization signal is detected, it is considered that no candidate synchronization reference terminal is detected.

[0376] In some embodiments, the sideline terminal can also extend the detection time period in units of detection cycles. However, this will increase the probability of interruption. In this case, the maximum extension value needs to be limited. The detection time period can be expressed as T detect =(1.6+0.16*x1) In some embodiments, x1_max=4 in this case, corresponding to a maximum interruption probability of 50%.

[0377] In an actual example, for an asynchronous scenario: GNSS is the highest synchronization source priority, and the current synchronization source of the sideline terminal is directly or indirectly synchronized to other synchronization reference terminals in the cell. In this case, the sideline terminal needs to search for other asynchronous synchronization sources.

[0378] The basic detection time period is 8s = 50*160ms detection cycle, during which 6% of V2X data and reference signal transmissions are allowed to be discarded.

[0379] The detection period is fixedly extended to (8 + 8 * x2_max). In some embodiments, the sideline terminal can arbitrarily select 3 + 3 * x2_max detection cycles within the fixed detection period (8 + 8 * x2_max) for detection. Thus, the maximum V2X data and reference signal transmission discard probability within this period (8 + 8 * x2_max) is 6%. In some embodiments, the sideline terminal can select any 3 detection cycles within each 8 seconds for detection. This ensures that the V2X data and reference signal transmission discard probability within each 8 seconds is 30%.

[0380] In some embodiments, the sideline terminal can also extend the detection time period in units of detection cycles. However, this will increase the probability of interruption. In this case, the maximum extension value needs to be limited. The detection time period can be expressed as T detect =(8+0.16*x1) In some embodiments, x2_max=3 in this case, and the corresponding maximum interruption probability is 11.32%.

[0381] In some embodiments, different SL-DRX configurations may have different x1_max / x2_max values. For example, when there is no SL-DRX or the SL-DRX cycle is less than 320ms, x1_max / x2_max = 4; when the SL-DRX cycle is greater than 320ms, x1_max / x2_max = 2. In some embodiments, different synchronization source scenarios may have different parameter values. For example, in a synchronous scenario, x1_max = 4, and in an asynchronous scenario, x2_max = 8.

[0382] In this embodiment, step 902, step 904, and step 906 are optional. In different embodiments, one or more of these steps may be omitted or replaced.

[0383] Step 902 can be implemented as an independent embodiment, such as a synchronization source detection method on the sideline terminal side. Step 904 can be implemented as an independent embodiment, such as a synchronization signal sampling method on the sideline terminal side. Step 906 can be implemented as an independent embodiment, such as a synchronization source determination method on the sideline terminal side.

[0384] To sum up, the method provided in this embodiment clarifies the method for extending the detection time period when detecting the synchronization source in SL-U, thereby clarifying the method for determining the detection time period in SL-U and providing an implementation method for detecting the synchronization source in SL-U.

[0385] Furthermore, when sampling the synchronization signal, the sideline terminal can select different numbers of detection cycles for different basic detection time periods. Furthermore, the sideline terminal can combine the sampling results from different basic detection time periods to determine whether the synchronization source has been detected based on the first condition. This solution can improve the flexibility of synchronization signal sampling, thereby increasing the likelihood of detecting the synchronization source. Furthermore, the method provided in the embodiments of the present application clarifies the conditions for detecting the synchronization source, thereby improving the accuracy of synchronization source detection.

[0386] Regarding the above solution (1) - gradually extending the detection time period. FIG10 is a flow chart of a detection method provided by an exemplary embodiment of the present application. The method can be executed by a sideline terminal. The method includes:

[0387] Step 1002: When the first sampling result within the detection time period meets the third condition, the detection time period is extended by m basic detection time periods.

[0388] m is a positive integer. The detection time period is used by the sideline terminal to detect the synchronization source through the SL-U. It should be noted that the detection in the embodiment of the present application is equivalent to / can be replaced by: discovery / detection.

[0389] The detection time period includes multiple basic detection time periods. In some embodiments, the basic detection time period includes at least one of the following:

[0390] One or more SLSS cycles;

[0391] One or more S-SSB periods;

[0392] One or more SL-DRX cycles.

[0393] In some embodiments, when the detection time period is not extended, the detection time period includes one or more basic detection time periods, for example, only one basic detection time period. The basic detection time period is used to extend the detection time period, for example, the detection time period is extended in units of the basic detection time period. The process of extending the detection time period is described below.

[0394] In some embodiments, each basic detection time period includes one or more detection cycles. The detection cycle includes at least one of an SLSS cycle, an S-SSB cycle, and an SL-DRX cycle. In some embodiments, the first sampling result includes a sampling result for a synchronization signal, which is sent by a synchronization source and is used to detect the synchronization source. The synchronization signal includes at least one of the following:

[0395] SLSS;

[0396] ·S-SSB.

[0397] In some embodiments, if the unextended detection time period includes a basic detection time period, then the detection time period including multiple basic detection time periods is obtained by extending the unextended detection time period. In this case, the detection time period including multiple basic detection time periods is an extended detection time period. In some embodiments, the detection time period may also include a basic detection time period. In this case, the detection time period is not extended. The extension of the detection time period may also be performed in accordance with the following scheme.

[0398] The first sampling result is determined based on the second sampling result of one or more (each) basic detection time periods in multiple basic detection time periods. In this solution, the sideline terminal will merge the second sampling results in different basic detection time periods to determine whether the detection time period needs to be extended. In the solution mentioned in the background introduction, when determining whether to extend the detection time period, only the sampling results in the most recently extended basic detection time period are considered, and the sampling results in the previous basic detection time periods are completely discarded. The above solution in the embodiment of the present application can reduce the detection time period used by the sideline terminal, thereby reducing terminal overhead.

[0399] In some embodiments, m is equal to 1. That is, each time the detection time period is extended, only one basic detection time period is extended. It should be noted that the number of basic detection time periods used for each extension of the detection time period can be the same or different.

[0400] In some embodiments, if the first sampling result within the detection time period does not satisfy the third condition, the sideline terminal stops extending the detection time period and determines that the synchronization source is detected.

[0401] In some embodiments, the first sampling result includes a sampling result for a synchronization signal. Each basic detection time period is used to sample the synchronization signal n times, where n is a positive integer. In some embodiments, n is equal to 3. In some embodiments, when sampling the synchronization signal in the basic detection time period, the sideline terminal randomly selects n detection cycles, thereby performing n sampling times.

[0402] In some embodiments, the synchronization signal includes at least one of SLSS and S-SSB.

[0403] In some embodiments, the third condition includes at least one of the following:

[0404] The cumulative number of sampling times of the synchronization signal during the detection period is less than the second parameter;

[0405] The time interval between two adjacent synchronization signal samples exceeds the third parameter.

[0406] In some embodiments, two adjacent synchronization signal samples refer to any two adjacent synchronization signal samples among multiple synchronization signal samples that meet the cumulative sampling number.

[0407] In some embodiments, the second parameter is determined by at least one of the following methods:

[0408] The second parameter is preset;

[0409] The second parameter is determined according to the terminal capability;

[0410] The second parameter is the network device configuration.

[0411] In some embodiments, the third parameter is determined by at least one of the following methods:

[0412] The third parameter is preset;

[0413] The third parameter is determined according to the terminal capabilities;

[0414] The third parameter is the network device configuration.

[0415] In some embodiments, the number of extensions corresponding to the detection time period is less than the first parameter, i.e., the number of extensions for the detection time period should not exceed the limit of the first parameter. The number of extensions is the cumulative number of times the detection time period extends the basic detection time period. The number of extensions is equivalent to / can be replaced by the number of extensions, which is the cumulative number of times the detection time period extends the basic detection time period.

[0416] In some embodiments, the first parameter is related to the SL-DRX configuration. In some embodiments, when the SL-DRX mode is not in operation or the SL-DRX cycle is less than the first value, the first parameter has a first value. In some embodiments, when the SL-DRX cycle is greater than the first value, the first parameter has a second value. In some embodiments, the first value is different from the second value, for example, the first value is greater than the second value.

[0417] In some embodiments, the first parameter is related to the synchronization source priority of the current synchronization source of the sideline terminal. In some embodiments, when the current synchronization source of the sideline terminal is a synchronization reference terminal, and the synchronization source to which the synchronization reference terminal is directly or indirectly synchronized is synchronized with the synchronization source with the highest synchronization source priority, the first parameter is a first value. In some embodiments, when the current synchronization source of the sideline terminal is a synchronization reference terminal, and the synchronization source to which the synchronization reference terminal is directly or indirectly synchronized is different in timing from the synchronization source with the highest synchronization source priority, the first parameter is a third value. In some embodiments, the third value is different from the first value and the second value, for example, the third value is greater than the first value.

[0418] Step 1004: When the number of extension times is greater than the first parameter, it is determined that no synchronization source is detected.

[0419] To sum up, the method provided in this embodiment clarifies the method for extending the detection time period when detecting the synchronization source in SL-U, thereby clarifying the method for determining the detection time period in SL-U and providing an implementation method for detecting the synchronization source in SL-U.

[0420] In addition, the first sampling result is determined based on the second sampling result of one or more (each) basic detection time periods in the multiple basic detection time periods. This solution can reduce the detection time period used by the sideline terminal, thereby reducing terminal overhead. Furthermore, the method provided in the embodiment of the present application clarifies the conditions for detecting the synchronization source, which can improve the accuracy of synchronization source detection.

[0421] Regarding the above solution (1) - directly extending to the maximum detection time period. FIG11 is a flow chart of a detection method provided by an exemplary embodiment of the present application. The method can be executed by a sideline terminal. The method includes:

[0422] Step 1102: When the first sampling result within the detection time period satisfies the third condition, the detection time period is extended by a first parameter number of basic detection time periods.

[0423] The detection time period is used by the sideline terminal to detect the synchronization source through the SL-U. It should be noted that the detection in the embodiment of the present application is equivalent to / can be replaced by: discovery / detection.

[0424] The extended detection time period includes the first parameter + 1 basic detection time period. In some embodiments, the basic detection time period includes at least one of the following:

[0425] One or more SLSS cycles;

[0426] One or more S-SSB periods;

[0427] One or more SL-DRX cycles.

[0428] In some embodiments, when the detection time period is not extended, the detection time period includes one or more basic detection time periods, for example, only one basic detection time period. The basic detection time period is used to extend the detection time period, for example, the detection time period is extended in units of the basic detection time period. The process of extending the detection time period is described below.

[0429] In some embodiments, each basic detection time period includes one or more detection cycles. The detection cycle includes at least one of an SLSS cycle, an S-SSB cycle, and an SL-DRX cycle. In some embodiments, the first sampling result includes a sampling result for a synchronization signal, which is sent by a synchronization source and is used to detect the synchronization source. The synchronization signal includes at least one of the following:

[0430] SLSS;

[0431] ·S-SSB.

[0432] In some embodiments, if the first sampling result within the detection time period satisfies the third condition, the sideline terminal extends the detection time period by a first parameter number of basic detection time periods, where the extended detection time period includes (first parameter + 1) basic detection time periods. In some embodiments, the detection time period before extension includes only one basic detection time period.

[0433] In some embodiments, the third condition includes at least one of the following:

[0434] The cumulative number of sampling times of the synchronization signal during the detection period is less than the second parameter;

[0435] The time interval between two adjacent synchronization signal samples exceeds the third parameter.

[0436] In the above solution, when sampling the synchronization signal, the sideline terminal can select different numbers of detection cycles for different basic detection time periods. Furthermore, the sideline terminal can combine the sampling results from different basic detection time periods to determine whether the synchronization source has been detected based on the third condition. In contrast, in the solution mentioned in the background introduction, when sampling the synchronization signal, the same number of detection cycles is selected for different basic detection time periods, and only the sampling results from a specific basic detection time period are considered. The above solution in the embodiment of the present application can improve the flexibility of synchronization signal sampling, thereby increasing the likelihood of detecting the synchronization source.

[0437] In some embodiments, the first parameter is related to the sidelink discontinuous reception (SL-DRX) configuration. In some embodiments, when the SL-DRX mode is not in operation or the SL-DRX cycle is less than the first value, the first parameter takes a first value. In some embodiments, when the SL-DRX cycle is greater than the first value, the first parameter takes a second value.

[0438] In some embodiments, the first parameter is related to the synchronization source priority of the terminal's current synchronization source. In some embodiments, when the sideline terminal's current synchronization source is a synchronization reference terminal, and the synchronization source to which the synchronization reference terminal is directly or indirectly synchronized is synchronized with the synchronization source with the highest synchronization source priority, the first parameter takes a first value. In some embodiments, when the sideline terminal's current synchronization source is a synchronization reference terminal, and the synchronization source to which the synchronization reference terminal is directly or indirectly synchronized is different in timing from the synchronization source with the highest synchronization source priority, the first parameter takes a third value. In some embodiments, the third value is different from the first value and the second value.

[0439] In some embodiments, the second parameter is determined by at least one of the following methods:

[0440] The second parameter is preset;

[0441] The second parameter is determined according to the terminal capability;

[0442] The second parameter is the network device configuration.

[0443] In some embodiments, the third parameter is determined by at least one of the following methods:

[0444] The third parameter is preset;

[0445] The third parameter is determined according to the terminal capabilities;

[0446] The third parameter is the network device configuration.

[0447] Step 1104: within the first parameter+1 basic detection time period, select (1+first parameter)*n detection cycles to perform synchronization signal sampling.

[0448] n is a positive integer. In some embodiments, the first sampling result includes a sampling result for a synchronization signal. Each basic detection time period includes one or more detection cycles. In some embodiments, the detection cycle includes at least one of an SLSS cycle, an S-SSB cycle, and an SL-DRX cycle. Within (first parameter + 1) basic detection time periods, the sideline terminal will select (1 + first parameter) * n detection cycles for synchronization signal sampling, where n is a positive integer. In some embodiments, the number of detection cycles selected by the sideline terminal in different basic detection time periods is the same or different. In some embodiments, n is equal to 3. In some embodiments, the sideline terminal randomly selects (1 + first parameter) * n detection cycles within the detection time period. In some embodiments, the above-mentioned synchronization signal includes at least one of SLSS and S-SSB.

[0449] Step 1106: If the sampling result within the first parameter+1 basic detection time period meets the third condition, it is determined that no synchronization source is detected.

[0450] In some embodiments, when the sampling result within the first parameter+1 basic detection time period does not meet the third condition, the sideline terminal determines that the synchronization source is detected.

[0451] To sum up, the method provided in this embodiment clarifies the method for extending the detection time period when detecting the synchronization source in SL-U, thereby clarifying the method for determining the detection time period in SL-U and providing an implementation method for detecting the synchronization source in SL-U.

[0452] Furthermore, when sampling synchronization signals, the sideline terminal can select different numbers of detection cycles for different basic detection time periods. Furthermore, the sideline terminal can combine the sampling results from different basic detection time periods to determine whether a synchronization source has been detected based on a third condition. This solution can improve the flexibility of synchronization signal sampling, thereby increasing the likelihood of detecting a synchronization source. Furthermore, the method provided in the embodiments of the present application clarifies the conditions for detecting a synchronization source, thereby improving the accuracy of synchronization source detection.

[0453] Regarding the above solution (2), FIG12 is a flow chart of a measurement method provided by an exemplary embodiment of the present application. The method can be executed by a sideline terminal. The method includes:

[0454] Step 1202: During measurement of the first synchronization source of the SL-U, if the second condition is met, it is determined that the first synchronization source is unavailable.

[0455] The second condition includes at least one of the following:

[0456] No measurement results were obtained for the fourth maximum measurement period in a row. The maximum measurement period was obtained by extending the measurement period by the fifth parameter.

[0457] No measurement result is obtained for the sixth consecutive measurement period, where each measurement period includes multiple measurement periods.

[0458] No measurement result was obtained within the first time period.

[0459] The maximum measurement time period includes multiple measurement cycles. In some embodiments, the measurement cycle includes at least one of an SLSS cycle, an S-SSB cycle, and an SL-DRX cycle. In some embodiments, when the sideline terminal fails to measure a measurement result within the non-extended measurement time period, it will extend the measurement time period in units of measurement cycles and continue measuring. Thereafter, when the measurement time period is extended to the maximum measurement time period and still no measurement result is measured, the sideline terminal may perform measurements again in the above manner. In some embodiments, the above-mentioned second condition is used to determine whether to stop measuring the first synchronization source.

[0460] In some embodiments, not measuring the measurement result may also refer to not measuring a sufficient number of measurement results, that is, the actual number of measurements does not meet the required number of measurements.

[0461] In some embodiments, the maximum measurement time period is obtained by extending the measurement time period by a maximum number of measurement cycles. In some embodiments, measuring the first synchronization source refers to measuring the PSBCH-RSRP of the first synchronization source.

[0462] In some embodiments, the maximum measurement time period can be expressed as (2+y_max)*160 or (2+y_max)*SL-DRX cycle. 160ms refers to the SLSS cycle. y_max represents the maximum number of extensions, that is, the maximum number of measurement cycles extended based on 2 measurement cycles (the measurement time period when not extended). The maximum number of extensions is equivalent to / can be replaced by the maximum number of extensions, that is, the maximum number of times the measurement cycle is extended (one measurement cycle is extended each time) based on 2 measurement cycles (the measurement time period when not extended). In some embodiments, y_max=2.

[0463] In some embodiments, the fourth parameter is determined by at least one of the following methods:

[0464] The fourth parameter is preset;

[0465] The fourth parameter is determined according to the terminal capabilities;

[0466] The fourth parameter is for network device configuration;

[0467] The fourth parameter is determined according to the synchronization source priority or type of the first synchronization source;

[0468] The fourth parameter is determined according to the synchronization source priority or type of the synchronization source currently selected by the terminal.

[0469] In some embodiments, the sixth parameter is determined by at least one of the following methods:

[0470] The sixth parameter is preset;

[0471] The sixth parameter is determined according to the terminal capability;

[0472] The sixth parameter is for network device configuration;

[0473] The sixth parameter is determined according to the synchronization source priority or type of the first synchronization source;

[0474] The sixth parameter is determined according to the synchronization source priority or type of the synchronization source currently selected by the terminal.

[0475] In some embodiments, the first duration is determined by at least one of the following methods:

[0476] The first duration is preset;

[0477] The first duration is determined based on the terminal's capabilities;

[0478] The first duration is configured by the network device;

[0479] The first duration is determined according to the synchronization source priority or type of the first synchronization source;

[0480] The first duration is determined according to the synchronization source priority or type of the synchronization source currently selected by the terminal.

[0481] It should be noted that the determination methods of the fourth parameter, the sixth parameter and the first duration in the embodiments of the present application are exactly the same, partially the same, or completely different.

[0482] Step 1204: Execute the sideline terminal behavior when the synchronization source is unavailable.

[0483] In some embodiments, the first synchronization source is a synchronization reference terminal. In the related art, when the sideline terminal measures the first synchronization source, the extension parameter of its measurement time period may exceed the maximum extension parameter due to LBT failure / the synchronization reference terminal is no longer in the current area (invisible). In this case, the sideline terminal in the related art will endlessly remeasure the first synchronization source, resulting in a large overhead for the sideline terminal. In order to avoid endless repeated measurements of the same synchronization source, the method provided in the embodiment of the present application introduces the above-mentioned second condition to terminate the measurement of the synchronization source, and provides the behavior of the sideline terminal when the second condition is met. The content is as follows:

[0484] In some embodiments, when the first synchronization source is unavailable (satisfying the second condition can be regarded as the first synchronization source being out of the current area (invisible), rather than LBT failure), the sideline terminal stops measuring the first synchronization source.

[0485] In some embodiments, when the first synchronization source is the synchronization source currently selected by the sideline terminal, the sideline terminal triggers synchronization source detection.

[0486] In some embodiments, when the first synchronization source is the synchronization source currently selected by the sideline terminal, the sideline terminal status changes from having the first synchronization source (synchronization reference terminal) as the synchronization source to having no synchronization source.

[0487] In some embodiments, when the first synchronization source is the synchronization source currently selected by the sideline terminal, before the sideline terminal selects the second synchronization source, the sideline terminal will trigger the transmission of a synchronization signal according to local timing. In some embodiments, the synchronization signal includes at least one of SLSS and S-SSB.

[0488] In some embodiments, when the first synchronization source is a candidate synchronization source, the sideline terminal detects and measures the second synchronization source.

[0489] In some embodiments, during measurement of the first synchronization source, if the second condition is not met (it can be considered that the first synchronization source is still in the current area (visible), but cannot be measured due to too many LBT failures), the sideline terminal will determine that the first synchronization source is available.

[0490] In some embodiments, when the first synchronization source is available, the sideline terminal will continue to measure the first synchronization source. In this case, it may not be considered whether the first synchronization source has been selected as a synchronization source or a candidate synchronization source.

[0491] In a practical example, the maximum extension parameter of the PSBCH-RSRP measurement period of the synchronization source may be set to y_max=2.

[0492] If the extension parameter y exceeds y_max, the behavior of the side terminal is:

[0493] When y_max is exceeded for the first time, the sideline terminal can re-measure the same synchronous reference terminal. However, it cannot re-measure endlessly, so a condition for stopping measurement is required. This condition can be one or a combination of the following:

[0494] The parameters for the extension of N1y consecutive PSBCH-RSRP measurement time periods all exceed y_max. For example: the maximum measurement time period for each PSBCH-RSRP is (2+y_max) measurement cycles. The sideline terminal determines that LBT has failed when measuring the synchronization reference terminal 1 in the first group of 4 measurement cycles and fails to measure PSBCH-RSRP (y must exceed y_max). Then, the sideline terminal restarts the measurement of the synchronization reference terminal 1. No PSBCH-RSRP is measured in the second group of 4 measurement cycles either. Assuming N1y=2, if no PSBCH-RSRP result is measured in Ny=2 consecutive PSBCH-RSRP measurement time periods, then it is very likely that the synchronization reference terminal 1 is unavailable (for example, it has moved out of the area or stopped sending synchronization signals or other reasons), rather than the failure of LBT to send synchronization signals.

[0495] No PSBCH-RSRP is measured for N2y consecutive measurement periods. Here, the value of N2y should be relatively large, such as N2y = 8, which can achieve an effect similar to the example in the previous condition. The value of N2y does not need to be a multiple of (2 + y_max), such as N2y = 6.

[0496] The sidelink terminal cannot measure the corresponding synchronization reference terminal during the Ty period. This means that PSBCH-RSRP is not measured for a long period of time. If Ty = N1y*(2+y_max)*max(S-SSB period, SL-DRX period), the two solutions are equivalent. If Ty is not an integer multiple of the PSBCH-RSRP measurement period, the two solutions differ slightly.

[0497] When the second condition is met (i.e., the corresponding synchronization reference terminal cannot be measured for a long time, which is likely because the synchronization reference terminal has left the current area or stopped sending synchronization signals), the sideline terminal may consider the synchronization reference terminal unavailable and need to stop measuring the synchronization reference terminal. The corresponding sideline terminal behaviors are as follows:

[0498] (1) For the synchronization reference terminal currently selected as the synchronization source: If the current synchronization source is unavailable, it means that the sideline terminal has no selected synchronization reference terminal. The sideline terminal's behavior includes:

[0499] a. Trigger the search for synchronization sources.

[0500] b. Before selecting other synchronization sources, trigger the synchronization signal sending according to local timing.

[0501] c. When the sideline terminal believes that there is no synchronization source, it will perform the above two actions. No additional modifications are required to the current protocol. It only needs to clarify under what conditions / circumstances it can be considered that the sideline terminal has no synchronization reference terminal.

[0502] (2) For a candidate synchronization reference terminal: the sideline terminal stops measuring the candidate synchronization reference terminal and can search for and measure other synchronization sources.

[0503] When the second condition is not met, the sideline terminal may consider that the synchronization reference terminal is still available, but the synchronization signal fails to be sent due to LBT. The sideline terminal may also re-measure the synchronization reference terminal.

[0504] In this embodiment, step 1202 and step 1204 are optional. In different embodiments, one or more of these steps may be omitted or replaced.

[0505] Step 1202 can be implemented as an independent embodiment, such as being implemented as a synchronization source measurement method on the sideline terminal side. Step 1204 can be implemented as an independent embodiment, such as being implemented as a synchronization source measurement method on the sideline terminal side.

[0506] In summary, the method provided in this embodiment, by providing a second condition, can determine whether the synchronization source being measured by a sideline terminal is available, and then, based on the determination result, determine whether to stop measuring the synchronization source. This avoids endless repetition of measurements of the same synchronization source, reducing overhead for the sideline terminal. Furthermore, the method provided in this embodiment specifies the behavior of the sideline terminal when the second condition is met, and when it is not met.

[0507] Regarding the above solution (2), FIG13 is a flow chart of a measurement method provided by an exemplary embodiment of the present application. The method can be executed by a sideline terminal. The method includes:

[0508] Step 1302: During measurement of the first synchronization source of the SL-U, if the fourth condition is not satisfied, it is determined that the first synchronization source is unavailable.

[0509] The fourth condition includes at least one of the following:

[0510] The measurement results are obtained for the fourth consecutive maximum measurement time period;

[0511] The measurement results are obtained for the sixth parameter measurement cycle in a row;

[0512] The measurement result is measured within the first time period.

[0513] The maximum measurement time period includes multiple measurement cycles. In some embodiments, the measurement cycle includes at least one of an SLSS cycle, an S-SSB cycle, and an SL-DRX cycle. In some embodiments, when the sideline terminal does not measure a measurement result within the non-extended measurement time period, it will extend the measurement time period in units of measurement cycles and continue measuring. Thereafter, when the measurement time period is extended to the maximum measurement time period and still no measurement result is measured, the sideline terminal may perform measurements again in the above manner. In some embodiments, the fourth condition is used to determine whether to stop measuring the first synchronization source.

[0514] In some embodiments, not measuring the measurement result may also refer to not measuring a sufficient number of measurement results, that is, the actual number of measurements does not meet the required number of measurements.

[0515] In some embodiments, the maximum measurement time period is obtained by extending the measurement time period by a maximum number of measurement cycles. In some embodiments, measuring the first synchronization source refers to measuring the PSBCH-RSRP of the first synchronization source.

[0516] In some embodiments, the maximum measurement time period can be expressed as (2+y_max)*160 or (2+y_max)*SL-DRX cycle. 160ms refers to the SLSS cycle. y_max represents the maximum number of extensions, that is, the maximum number of measurement cycles extended based on 2 measurement cycles (the measurement time period when not extended). The maximum number of extensions is equivalent to / can be replaced by the maximum number of extensions, that is, the maximum number of times the measurement cycle is extended (one measurement cycle is extended each time) based on 2 measurement cycles (the measurement time period when not extended). In some embodiments, y_max=2.

[0517] In some embodiments, the fourth parameter is determined by at least one of the following methods:

[0518] The fourth parameter is preset;

[0519] The fourth parameter is determined according to the terminal capabilities;

[0520] The fourth parameter is for network device configuration;

[0521] The fourth parameter is determined according to the synchronization source priority or type of the first synchronization source;

[0522] The fourth parameter is determined according to the synchronization source priority or type of the synchronization source currently selected by the terminal.

[0523] In some embodiments, the sixth parameter is determined by at least one of the following methods:

[0524] The sixth parameter is preset;

[0525] The sixth parameter is determined according to the terminal capability;

[0526] The sixth parameter is for network device configuration;

[0527] The sixth parameter is determined according to the synchronization source priority or type of the first synchronization source;

[0528] The sixth parameter is determined according to the synchronization source priority or type of the synchronization source currently selected by the terminal.

[0529] In some embodiments, the first duration is determined by at least one of the following methods:

[0530] The first duration is preset;

[0531] The first duration is determined based on the terminal's capabilities;

[0532] The first duration is configured by the network device;

[0533] The first duration is determined according to the synchronization source priority or type of the first synchronization source;

[0534] The first duration is determined according to the synchronization source priority or type of the synchronization source currently selected by the terminal.

[0535] It should be noted that the determination methods of the fourth parameter, the sixth parameter and the first duration in the embodiments of the present application are exactly the same, partially the same, or completely different.

[0536] Step 1304: Execute the sideline terminal behavior when the synchronization source is unavailable.

[0537] In some embodiments, the first synchronization source is a synchronization reference terminal. In the related art, when the sideline terminal measures the first synchronization source, the extension parameter of its measurement time period may exceed the maximum extension parameter due to LBT failure / the synchronization reference terminal is no longer in the current area (invisible). In this case, the sideline terminal in the related art will endlessly remeasure the first synchronization source, resulting in a large overhead for the sideline terminal. In order to avoid endless repeated measurements of the same synchronization source, the method provided in the embodiment of the present application introduces the above-mentioned fourth condition to terminate the measurement of the synchronization source, and provides the behavior of the sideline terminal when the fourth condition is met. The content is as follows:

[0538] In some embodiments, when the first synchronization source is unavailable (satisfying the fourth condition can be regarded as the first synchronization source being out of the current area (invisible), rather than LBT failure), the sideline terminal stops measuring the first synchronization source.

[0539] In some embodiments, when the first synchronization source is the synchronization source currently selected by the sideline terminal, the sideline terminal triggers synchronization source detection.

[0540] In some embodiments, when the first synchronization source is the synchronization source currently selected by the sideline terminal, the sideline terminal status changes from having the first synchronization source (synchronization reference terminal) as the synchronization source to having no synchronization source.

[0541] In some embodiments, when the first synchronization source is the synchronization source currently selected by the sideline terminal, before the sideline terminal selects the second synchronization source, the sideline terminal will trigger the transmission of a synchronization signal according to local timing. In some embodiments, the synchronization signal includes at least one of SLSS and S-SSB.

[0542] In some embodiments, when the first synchronization source is a candidate synchronization source, the sideline terminal detects and measures the second synchronization source.

[0543] In some embodiments, during measurement of the first synchronization source, if the fourth condition is met (it can be considered that the first synchronization source is still in the current area (visible), but cannot be measured due to too many LBT failures), the sideline terminal will determine that the first synchronization source is available.

[0544] In some embodiments, when the first synchronization source is available, the sideline terminal will continue to measure the first synchronization source. In this case, it may not be considered whether the first synchronization source has been selected as a synchronization source or a candidate synchronization source.

[0545] In this embodiment, step 1302 and step 1304 are optional. In different embodiments, one or more of these steps may be omitted or replaced.

[0546] Step 1302 can be implemented as an independent embodiment, such as being implemented as a synchronization source measurement method on the sideline terminal side. Step 1304 can be implemented as an independent embodiment, such as being implemented as a synchronization source measurement method on the sideline terminal side.

[0547] In summary, the method provided in this embodiment, by providing the fourth condition, can determine whether the synchronization source being measured by the sideline terminal is available, and then, based on the determination result, determine whether to stop measuring the synchronization source. This avoids endless repetition of measuring the same synchronization source, reducing overhead for the sideline terminal. Furthermore, the method provided in this embodiment also specifies the behavior of the sideline terminal when the fourth condition is met and when it is not met.

[0548] Regarding the above solution (3), FIG14 is a flow chart of an evaluation method provided by an exemplary embodiment of the present application. The method can be executed by a sideline terminal. The method includes:

[0549] Step 1402: Extend the evaluation time period by a seventh parameter.

[0550] This evaluation time period is used to evaluate the measurement results of the currently selected synchronization source in SL-U, and the evaluation results are used to trigger the transmission of the synchronization signal of the sidelink terminal. In some embodiments, the synchronization signal includes at least one of SLSS and S-SSB. The seventh parameter is related to the fifth parameter, and the fifth parameter is used to extend the measurement time period to the maximum measurement time period, and the measurement time period is used to measure the synchronization source. For the introduction of the measurement time period and the fifth parameter, reference may be made to the embodiments shown in FIG. 6, which will not be elaborated herein.

[0551] In some embodiments, the seventh parameter is an even multiple of the fifth parameter. In some embodiments, the seventh parameter is 2 times the fifth parameter.

[0552] The evaluation time period includes multiple evaluation cycles. In some embodiments, the evaluation cycle includes at least one of an SLSS cycle, an S-SSB cycle, and an SL-DRX cycle. In some embodiments, when the sidelink terminal cannot evaluate the measurement results of the synchronization source within the unextended evaluation time period, the evaluation time period will be extended in units of the evaluation cycle and continue to be evaluated to determine whether to trigger the transmission of the synchronization signal of the sidelink terminal.

[0553] In some embodiments, the evaluation time period can be expressed as (4 + x) * synchronization signal period or (4 + x) * SL-DRX cycle. x represents the number of extended evaluation cycles, that is, on the basis of 4 evaluation cycles (the evaluation time period without extension), the number of extended evaluation cycles. This number of extensions is equivalent to / can be replaced by the number of extension times, that is, on the basis of 4 evaluation cycles, the maximum number of times to extend the evaluation cycle (each time extending one evaluation cycle). Among them, x < x_max. x_max represents the maximum number of extended evaluation cycles. In some embodiments, x_max = 2 * y_max, and y_max represents the above-mentioned fifth parameter.

[0554] Step 1404: Perform sidelink terminal behavior according to the evaluation results within the evaluation time period.

[0555] For the case where the evaluated synchronization source is unavailable:

[0556] In some embodiments, when the synchronization source is unavailable (which can be regarded as the synchronization source (synchronization reference terminal) is no longer in the current area (invisible), rather than a LBT failure), the sidelink terminal will consider that there is no synchronization source, and at this time the sidelink terminal will trigger the transmission of the synchronization signal.

[0557] For the case where the evaluated synchronization source is available:

[0558] In some embodiments, if the synchronization source is available (this can be considered as the synchronization source still being in the current area (visible), but due to excessive LBT failures, the measurement results cannot be accurately evaluated), the sideline terminal will maintain the current synchronization signal transmission behavior. For example, if it previously determined based on reliable measurement results that synchronization signals needed to be transmitted, the sideline terminal will continue to transmit. Alternatively, the sideline terminal may determine whether to transmit synchronization signals based on the latest valid measurement results. In some embodiments, the measurement result is PSBCH-RSRP.

[0559] In some embodiments, when a synchronization source is available, the sideline terminal determines whether to transmit a synchronization signal based on its capabilities. In some embodiments, this terminal capability is an existing terminal capability. For example, a sideline terminal requiring energy conservation may choose not to transmit a synchronization signal. In some embodiments, this terminal capability is a newly introduced terminal capability for this scenario.

[0560] In some embodiments, when a synchronization source is available, the sideline terminal determines whether to transmit a synchronization signal based on pre-configuration information or signaling from a network device.

[0561] In some embodiments, when a synchronization source is available, the sideline terminal determines whether to transmit a synchronization signal based on the synchronization source priority or type of the synchronization source. In some embodiments, if the synchronization source priority of the synchronization source is higher than a priority threshold, the synchronization signal is transmitted; if the synchronization source priority of the synchronization source is lower than the priority threshold, the synchronization signal is not transmitted.

[0562] In some embodiments, the priority threshold is determined by at least one of the following methods:

[0563] Priority thresholds are preset;

[0564] Priority thresholds are determined based on terminal capabilities;

[0565] Priority thresholds are configured on network devices.

[0566] In some embodiments, when a synchronization source is available, the sideline terminal may utilize currently inaccurate measurements to evaluate whether to transmit a synchronization signal.

[0567] In some embodiments, when the synchronization source is available, the sending of the synchronization signal is triggered, that is, the sending of the synchronization signal is triggered regardless of the value of the measurement result.

[0568] In some embodiments, the above-mentioned behaviors of the sideline terminal when a synchronization source is available can be freely combined and applied. For example, the sideline terminal will only send a synchronization signal when both the signaling configuration and priority conditions are met. If either condition is not met, no synchronization signal will be sent.

[0569] In some embodiments, the synchronization source being available includes the measurement of the synchronization source not meeting the measurement requirements (i.e., the measurement result is unreliable). In some embodiments, not meeting the measurement requirements includes the actual number of measurements of the synchronization source being less than the required number of measurements. For example, the measurement of four cycles is required, but only two are measured.

[0570] For the implementation of the above-mentioned determination of whether the synchronization source is available, reference may be made to the second condition in the embodiment shown in FIG6 , which is not described in detail in this application. It should be noted that in the process of evaluating whether the synchronization source is available, when using the second condition in the embodiment shown in FIG6 for determination, the same or different parameters as those used for the second condition in the embodiment shown in FIG6 may be used.

[0571] In a practical example, the PSBCH-RSRP evaluation period is defined as (4+x)*evaluation period (S-SSB period), where x should be less than x_max. In some embodiments, x_max=2*y_max, where y_max is the y_max in the PSBCH-RSRP measurement in the measurement-related embodiments.

[0572] Typically, the evaluation period includes multiple measurement periods. FIG15 is a schematic diagram of an evaluation period provided by an exemplary embodiment of the present application. As shown in FIG15 , the evaluation period T in SL evaluate There are 4 S-SSB cycles, which include exactly 2 PSBCH-RSRP measurement periods. Therefore, the extension of the measurement period due to LBT failure also needs to follow this rule, so it can be concluded that x_max = 2*y_max.

[0573] Behavior of the sideline terminal if x exceeds x_max:

[0574] (1) Combined with the second condition in the above embodiment:

[0575] a. When this condition is met, it means that the PSBCH-RSRP of the current synchronization source (SyncRef UE) cannot be measured for a long time, and the synchronization source is considered to be no longer available. Then the sideline terminal will automatically trigger the synchronization signal transmission.

[0576] b. If this condition is not met, the synchronization source can be re-measured. Before obtaining an accurate PSBCH-RSRP evaluation result, the synchronization signal transmission behavior includes at least one of the following:

[0577] i. Maintain the existing behavior, or make a decision based on the latest valid PSBCH-RSRP evaluation result. For example, the sideline terminal evaluate The PSBCH-RSRP is measured accurately during the period and it is determined that a synchronization signal needs to be sent. evaluateIf an accurate evaluation result is not obtained due to LBT failure, the current behavior (ie, sending a synchronization signal) can be maintained until a valid PSBCH-RSRP result is measured and whether to send a synchronization signal is re-determined based on the result.

[0578] ii. Determine whether to send a synchronization signal based on the terminal's capabilities.

[0579] 1. The terminal capability may refer to an existing capability. For example, for a sideline terminal that needs to save energy, it may be chosen not to send the capability.

[0580] 2. Introduce a new terminal capability to indicate whether to send a synchronization signal in this case.

[0581] iii. Decide whether to send a synchronization signal based on pre-configured or network-configured signaling. For example, introduce pre-configured or network-configured signaling TxSLSSwithInaccuratePSBCH-RSRP = {true, false}. In this case (due to LBT failure, an accurate PSBCH-RSRP evaluation result is not obtained, but the synchronization terminal is not completely lost, corresponding to the second condition not being met), when the signaling is true, the sideline terminal sends a synchronization signal; when the signaling is false, the sideline terminal does not send SLSS.

[0582] iv. Determine whether to send a synchronization signal based on the priority / type of the synchronization source.

[0583] 1. Introduce a priority threshold, for example, 4. If the priority of the synchronization source is higher than the threshold, the sideline terminal can choose to send a synchronization signal so that the high-priority synchronization timing information can be disseminated; if the priority of the synchronization source is lower, the sideline terminal can choose not to send a synchronization signal.

[0584] 2. The priority threshold can be pre-configured, network configured, or determined by terminal capabilities.

[0585] 3. The priority threshold can be set to different values ​​based on the configuration parameters: sl-SyncPriority = {gnbEnb,gnss} and / or sl-NbAsSync = {true,false}. The first parameter indicates whether the cell or GNSS priority is higher. The second parameter indicates whether the cell (NodeB) is used as the synchronization source.

[0586] v. The above solutions can be combined. For example, in cases iii+iv, the sideline terminal transmits a synchronization signal only when both the signaling configuration and priority conditions are met, that is, when the signaling TxSLSSwithInaccuratePSBCH-RSRP is true and the synchronization source is above a specific threshold. If any of the conditions are not met, no synchronization signal is transmitted.

[0587] vi. Use the currently inaccurate PSBCH-RSRP for evaluation.

[0588] vii. Regardless of the measured PSBCH-RSRP value, the synchronization signal transmission is triggered.

[0589] It should be noted that although both a and b above will send synchronization signals (such as SLSS), the content of the transmission is different. a triggers the transmission of synchronization signals when the sideline terminal believes that there is no synchronization source. The timing information is determined based on the local time of the synchronization terminal. The synchronization signal identifier (SLSSID) is randomly selected from the out-of-coverage set, and the in-coverage information in the SL-Master Indication Block (MIB) is set to false. b triggers the transmission of synchronization signals when the sideline terminal has a synchronization source (SyncRef UE). The timing information comes from the synchronization source. Both the SLSSID and the in-coverage information in the SL-MIB need to be configured by the synchronization source.

[0590] (2) Introduce a new condition instead of the second condition mentioned above:

[0591] a. As long as the current synchronization source is available, the sideline terminal should trigger the transmission of the synchronization signal.

[0592] b. This new condition can be similar to the second condition above, but the parameter values ​​are different. For example, in Nx consecutive T evaluation The period exceeds x_max due to LBT failure, which makes it impossible for the user to obtain an accurate PSBCH-RSRP evaluation result.

[0593] i. Nx consecutive T evaluation The cycle can be replaced by S-SSB cycle or SL-DRX cycle

[0594] ii. The value of Nx can be predefined, network configured, or determined by UE capabilities.

[0595] iii. The value of Nx depends on the priority / type of the current synchronization source.

[0596] c. The behavior of the side terminal when this condition is met or not met can be the same as (1).

[0597] In this embodiment, step 1402 and step 1404 are optional. In different embodiments, one or more of these steps may be omitted or replaced.

[0598] Step 1402 can be implemented as an independent embodiment, such as being implemented as a synchronization source evaluation method on the sideline terminal side. Step 1404 can be implemented as an independent embodiment, such as being implemented as a synchronization source evaluation method on the sideline terminal side.

[0599] In summary, the method provided in this embodiment clarifies how to determine the evaluation period in the SL-U by clarifying how to extend the evaluation period when evaluating the synchronization source in the SL-U. By correlating the extension of the evaluation period with the measurement period, this provides a method for rationally setting the evaluation period, helping to clarify the relevant behavior of the sideline terminal through the evaluation of the evaluation period. Furthermore, the method provided in this embodiment also clarifies the behavior of the sideline terminal under different synchronization source availability conditions.

[0600] It should be noted that the order of the method steps provided in the embodiments of the present application can be appropriately adjusted, the steps can also be increased or decreased accordingly according to the circumstances, and different steps can be freely combined to form new embodiments. Any person skilled in the art who is familiar with the present invention can easily think of the method of variation within the technical scope disclosed in this application, and should be included in the protection scope of this application, so it will not be repeated here. In addition, the order of the above-mentioned different situations does not have a preferred meaning, but is only for the convenience of expression.

[0601] Figure 16 is a block diagram of a detection device provided by an exemplary embodiment of the present application. The device can be implemented as a side-traffic terminal, or as part of a side-traffic terminal, through software or hardware, or a combination of both. The device includes at least some of the following modules: an extension module 1601, a stop module 1602, a determination module 1603, and a selection module 1604.

[0602] Extension module 1601 is configured to extend the detection period if the first sampling result within the detection period does not meet the first condition; wherein the detection period is used to detect the synchronization source through SL-U. It should be noted that detection in this embodiment of the application is equivalent to / can be replaced by discovery / detection.

[0603] In some embodiments, the type of object that can serve as a synchronization source includes at least one of a GNSS, a cell, and a synchronization reference terminal.

[0604] In some embodiments, the sideline terminal's current synchronization source is a synchronization reference terminal, and the synchronization source to which the synchronization reference terminal directly or indirectly synchronizes is synchronized with the synchronization source with the highest synchronization source priority. This scenario is referred to as a synchronous scenario. In some embodiments, the sideline terminal's current synchronization source is a synchronization reference terminal, and the synchronization source to which the synchronization reference terminal directly or indirectly synchronizes is at a different timing than the synchronization source with the highest synchronization source priority. This scenario is referred to as an asynchronous scenario.

[0605] In some embodiments, the detection time period includes one or more basic detection time periods, and the basic detection time periods are used to extend the detection time period. In some embodiments, the basic detection time periods include at least one of the following:

[0606] One or more SLSS cycles;

[0607] One or more S-SSB cycles;

[0608] One or more SL-DRX cycles.

[0609] It should be noted that the detection time period in the embodiment of the present application is equivalent to / can be replaced by the detection time, and the basic detection time period is equivalent to / can be replaced by the basic detection time, the detection time unit, and the detection time unit. The embodiment of the present application does not limit this. It should be noted that in the embodiment of the present application, S-SSB is equivalent to / can be replaced by SLSS.

[0610] In some embodiments, when the detection time period is not extended, the detection time period includes one or more basic detection time periods, for example, only one basic detection time period. The basic detection time period is used to extend the detection time period, for example, the detection time period is extended in units of the basic detection time period.

[0611] In some embodiments, each basic detection time period includes one or more detection cycles. The detection cycle includes at least one of an SLSS cycle, an S-SSB cycle, and an SL-DRX cycle. In some embodiments, the first sampling result includes a sampling result for a synchronization signal, which is sent by a synchronization source and is used to detect the synchronization source. In some embodiments, the measurement result is equivalent to / can be replaced by a detection result. The synchronization signal includes at least one of the following:

[0612] SLSS;

[0613] S-SSB.

[0614] In some embodiments, the detection time period includes multiple basic detection time periods, and the first sampling result is determined based on the second sampling result of each of the multiple basic detection time periods. In some embodiments, if the unextended detection time period includes one basic detection time period, then the detection time period including multiple basic detection time periods is obtained by extending the unextended detection time period. In this case, the detection time period including multiple basic detection time periods is the extended detection time period.

[0615] In some embodiments, the extension module 1601 is used to:

[0616] If the first sampling result within the detection time period does not satisfy the first condition, the detection time period is extended by m basic detection time periods, where m is a positive integer. In some embodiments, m is equal to 1.

[0617] In some embodiments, the apparatus further comprises:

[0618] The stopping module 1602 is configured to stop extending the detection time period if the first sampling result within the detection time period meets the first condition.

[0619] In some embodiments, the first sampling result includes a sampling result for a synchronization signal, and each basic detection time period is used to sample the synchronization signal n times, where n is a positive integer. In some embodiments, n is equal to 3. In some embodiments, when sampling the synchronization signal in the basic detection time period, the sideline terminal randomly selects n detection cycles, thereby performing n sampling times.

[0620] In some embodiments, the number of extensions corresponding to the detection time period is less than the first parameter, and the number of extensions is the cumulative number of times the detection time period extends the basic detection time period. The number of extensions is equivalent to / can be replaced by the number of extensions, which is the cumulative number of times the detection time period extends the basic detection time period.

[0621] In some embodiments, the apparatus further comprises:

[0622] The determination module 1603 is configured to determine that the synchronization source is not detected if the number of extension times is greater than the first parameter.

[0623] In some embodiments, the extension module 1601 is used to:

[0624] If the first sampling result within the detection time period does not meet the first condition, the detection time period is extended by a first parameter number of basic detection time periods, where the extended detection time period includes the first parameter + 1 basic detection time period. In some embodiments, the detection time period before extension includes only one basic detection time period.

[0625] In some embodiments, the first sampling result includes a sampling result for a synchronization signal, each of the basic detection time periods includes one or more detection cycles; and the apparatus further includes:

[0626] The selection module 1604 is configured to select (1 + the first parameter) * n detection periods for synchronization signal sampling within the first parameter + 1 basic detection time period, where n is a positive integer. In some embodiments, the number of detection periods selected by the sideline terminal in different basic detection time periods is the same or different. In some embodiments, n is equal to 3.

[0627] In some embodiments, the apparatus further comprises:

[0628] The determination module 1603 is configured to determine that the synchronization source is not detected if the sampling result within the first parameter+1 basic detection time period does not meet the first condition.

[0629] In some embodiments, the first condition includes at least one of the following:

[0630] The cumulative number of sampling times of the synchronization signal within the detection time period is greater than or equal to a second parameter;

[0631] The time interval between two adjacent synchronization signal samples shall not exceed the third parameter.

[0632] In some embodiments, two adjacent synchronization signal samples refer to any two adjacent synchronization signal samples among multiple synchronization signal samples that meet the cumulative sampling number.

[0633] In some embodiments, the first parameter is related to the SL-DRX configuration. In some embodiments, in the case of non-SL-DRX or the SL-DRX cycle is less than the first value, the first parameter is a first value. In some embodiments, in the case of the SL-DRX cycle is greater than the first value, the first parameter is a second value.

[0634] In some embodiments, the first parameter is related to the synchronization source priority of the current synchronization source of the sideline terminal. In some embodiments, when the current synchronization source of the sideline terminal is a synchronization reference terminal, and the synchronization source directly or indirectly synchronized by the synchronization reference terminal is synchronized with the synchronization source with the highest synchronization source priority, the first parameter is a first value. In some embodiments, when the current synchronization source of the sideline terminal is a synchronization reference terminal, and the synchronization source directly or indirectly synchronized by the synchronization reference terminal is different in timing from the synchronization source with the highest synchronization source priority, the first parameter is a third value. In some embodiments, the third value is different from the first value and the second value, for example, the third value is greater than the first value.

[0635] In some embodiments, the second parameter is determined by at least one of the following methods:

[0636] The second parameter is preset;

[0637] The second parameter is determined according to the terminal capability;

[0638] The second parameter is configured by the network device.

[0639] In some embodiments, the third parameter is determined by at least one of the following methods:

[0640] The third parameter is preset;

[0641] The third parameter is determined according to the terminal capability;

[0642] The third parameter is configured by the network device.

[0643] In some embodiments, the apparatus provided by the embodiments of the present application includes an extension module 1601, which supports the execution of all extension-related steps performed by the sideline terminal in the above-mentioned embodiments.

[0644] In some embodiments, the apparatus provided by the embodiments of the present application includes multiple extension modules 1601, and the multiple extension modules 1601 respectively support the execution of some extension-related steps performed by the sideline terminal in each of the above embodiments.

[0645] In some embodiments, the steps performed by different extension modules 1601 are exactly the same, partially the same, or completely different.

[0646] In some embodiments, the apparatus provided by the embodiments of the present application includes a stop module 1602, which supports the execution of all stop-related steps performed by the sideline terminal in the above-mentioned various embodiments.

[0647] In some embodiments, the apparatus provided by the embodiments of the present application includes multiple stop modules 1602, and the multiple stop modules 1602 respectively support the execution of steps related to the partial stop performed by the sideline terminal in each of the above embodiments.

[0648] In some embodiments, the steps performed by different stop modules 1602 are identical, partially identical, or completely different.

[0649] In some embodiments, the apparatus provided by the embodiments of the present application includes a determination module 1603, which supports the execution of all determination-related steps performed by the sideline terminal in each of the above embodiments.

[0650] In some embodiments, the apparatus provided by the embodiments of the present application includes multiple determination modules 1603, and the multiple determination modules 1603 respectively support the execution of some of the determination-related steps performed by the sideline terminal in each of the above embodiments.

[0651] In some embodiments, the steps performed by different determination modules 1603 are completely the same, partially the same, or completely different.

[0652] In some embodiments, the apparatus provided by the embodiments of the present application includes a selection module 1604, which supports the execution of all selection-related steps performed by the sideline terminal in the above-mentioned various embodiments.

[0653] In some embodiments, the apparatus provided by the embodiments of the present application includes multiple selection modules 1604, and the multiple selection modules 1604 respectively support the execution of some selection-related steps performed by the sideline terminal in each of the above embodiments.

[0654] In some embodiments, the steps performed by different selection modules 1604 are completely identical, partially identical, or completely different.

[0655] To sum up, the device provided in this embodiment clarifies the method of determining the detection time period in SL-U by clarifying the method of extending the detection time period when detecting the synchronization source in SL-U, and provides an implementation method for detecting the synchronization source in SL-U.

[0656] FIG17 is a block diagram of a measurement device provided by an exemplary embodiment of the present application. The device can be implemented as a sideline terminal, or as part of a sideline terminal, through software or hardware, or a combination of both. The device includes at least some of the following modules: a determination module 1701, a stop module 1702, and a trigger module 1703.

[0657] The determination module 1701 is configured to determine that, during measurement of a first synchronization source of the SL-U, the first synchronization source is unavailable if a second condition is met.

[0658] In some embodiments, the second condition includes at least one of the following:

[0659] No measurement result is obtained for a fourth parameter maximum measurement time period in a row, the maximum measurement time period being obtained by extending the measurement time period by a fifth parameter;

[0660] No measurement result is measured for a sixth parameter number of measurement cycles in a row, each measurement time period including a plurality of measurement cycles;

[0661] No measurement result was measured during the first duration.

[0662] In some embodiments, the maximum measurement time period includes multiple measurement cycles. In some embodiments, the measurement cycle includes at least one of an SLSS cycle, an S-SSB cycle, and an SL-DRX cycle. In some embodiments, when the sideline terminal does not measure a measurement result within the non-extended measurement time period, it will extend the measurement time period in units of measurement cycles and continue measuring. Thereafter, when the measurement time period is extended to the maximum measurement time period and still no measurement result is measured, the sideline terminal may perform measurements again in the above manner. In some embodiments, the above-mentioned second condition is used to determine whether to stop measuring the first synchronization source.

[0663] In some embodiments, the maximum measurement time period is obtained by extending the measurement time period by a maximum number of measurement cycles. In some embodiments, measuring the first synchronization source refers to measuring the PSBCH-RSRP of the first synchronization source.

[0664] In some embodiments, the maximum measurement time period can be expressed as (2+y_max)*160 or (2+y_max)*SL-DRX cycle. 160 refers to the SLSS cycle. y_max represents the maximum number of extensions, that is, the maximum number of measurement cycles extended based on 2 measurement cycles (the measurement time period when not extended). The maximum number of extensions is equivalent to / can be replaced by the maximum number of extensions, that is, the maximum number of times the measurement cycle is extended (one measurement cycle is extended each time) based on 2 measurement cycles (the measurement time period when not extended). In some embodiments, y_max=2.

[0665] In some embodiments, the apparatus further comprises:

[0666] The stopping module 1702 is configured to stop measuring the first synchronization source when the first synchronization source is unavailable.

[0667] In some embodiments, the apparatus further comprises:

[0668] The triggering module 1703 is configured to trigger synchronization source detection when the first synchronization source is the synchronization source currently selected by the sideline terminal.

[0669] In some embodiments, the apparatus further comprises:

[0670] The trigger module 1703 is configured to trigger the sending of a synchronization signal according to local timing before the sideline terminal selects a second synchronization source, when the first synchronization source is the synchronization source currently selected by the sideline terminal.

[0671] In some embodiments, the apparatus further comprises:

[0672] The triggering module 1703 is configured to detect and measure a second synchronization source when the first synchronization source is a candidate synchronization source.

[0673] In some embodiments, the determining module 1701 is configured to:

[0674] During the measurement of the first synchronization source, if the second condition is not satisfied, it is determined that the first synchronization source is available.

[0675] In some embodiments, the fourth parameter is determined by at least one of the following methods:

[0676] The fourth parameter is preset;

[0677] The fourth parameter is determined according to the terminal capability;

[0678] The fourth parameter is configured by the network device;

[0679] The fourth parameter is determined according to the synchronization source priority or type of the first synchronization source;

[0680] The fourth parameter is determined according to the synchronization source priority or type of the synchronization source currently selected by the sideline terminal.

[0681] In some embodiments, the sixth parameter is determined by at least one of the following methods:

[0682] The sixth parameter is preset;

[0683] The sixth parameter is determined according to the terminal capability;

[0684] The sixth parameter is configured by the network device;

[0685] The sixth parameter is determined according to the synchronization source priority or type of the first synchronization source;

[0686] The sixth parameter is determined according to the synchronization source priority or type of the synchronization source currently selected by the sideline terminal.

[0687] In some embodiments, the first duration is determined in at least one of the following ways:

[0688] The first duration is preset;

[0689] The first duration is determined according to the terminal capability;

[0690] The first duration is configured by the network device;

[0691] The first duration is determined according to the synchronization source priority or type of the first synchronization source;

[0692] The first duration is determined according to the synchronization source priority or type of the synchronization source currently selected by the sideline terminal.

[0693] In some embodiments, the apparatus provided by the embodiments of the present application includes a determination module 1701, which supports the execution of all determination-related steps performed by the sideline terminal in each of the above embodiments.

[0694] In some embodiments, the apparatus provided by the embodiments of the present application includes multiple determination modules 1701, and the multiple determination modules 1701 respectively support the execution of some of the determination-related steps performed by the sideline terminal in each of the above embodiments.

[0695] In some embodiments, the steps performed by different determination modules 1701 are identical, partially identical, or completely different.

[0696] In some embodiments, the apparatus provided by the embodiments of the present application includes a stop module 1702, which supports the execution of all stop-related steps performed by the sideline terminal in the above-mentioned various embodiments.

[0697] In some embodiments, the apparatus provided by the embodiments of the present application includes multiple stop modules 1702, and the multiple stop modules 1702 respectively support the execution of steps related to the partial stop performed by the sideline terminal in each of the above embodiments.

[0698] In some embodiments, the steps performed by different stop modules 1702 are identical, partially identical, or completely different.

[0699] In some embodiments, the apparatus provided by the embodiments of the present application includes a trigger module 1703, which supports the execution of all trigger-related steps performed by the sideline terminal in the above-mentioned various embodiments.

[0700] In some embodiments, the apparatus provided by the embodiments of the present application includes multiple trigger modules 1703, and the multiple trigger modules 1703 respectively support the execution of some trigger-related steps performed by the sideline terminal in each of the above embodiments.

[0701] In some embodiments, the steps performed by different trigger modules 1703 are exactly the same, partially the same, or completely different.

[0702] In summary, the apparatus provided in this embodiment, by providing the second condition, can determine whether the synchronization source being measured by the sideline terminal is available. This determination result can then be used to determine whether to stop measuring the synchronization source. This avoids endlessly repeating the measurement of the same synchronization source, reducing overhead for the sideline terminal.

[0703] Figure 18 is a block diagram of an evaluation device provided by an exemplary embodiment of the present application. The device can be implemented as a sideline terminal, or as part of a sideline terminal, through software or hardware, or a combination of both. The device includes at least some of the following modules: an extension module 1801, a trigger module 1802, and a determination module 1803.

[0704] Extension module 1801 is configured to extend an evaluation period using a seventh parameter. The evaluation period is used to evaluate the measurement results of the currently selected synchronization source in the SL-U, and the evaluation results are used to trigger the transmission of a synchronization signal. The seventh parameter is related to the fifth parameter, which is used to extend the measurement period to a maximum measurement period. The measurement period is used to measure the synchronization source. For an introduction to the measurement period and the fifth parameter, please refer to the embodiment shown in FIG6 , and this application will not elaborate on them here.

[0705] The evaluation time period includes multiple evaluation cycles. In some embodiments, the evaluation cycle includes at least one of an SLSS cycle, an S-SSB cycle, and an SL-DRX cycle. In some embodiments, if the sideline terminal is unable to evaluate the measurement result of the synchronization source within the non-extended evaluation time period, the evaluation time period is extended in units of evaluation cycles and the evaluation is continued to determine whether to trigger the transmission of the synchronization signal of the sideline terminal.

[0706] In some embodiments, the evaluation time period can be expressed as (4 + x) * synchronization signal periods or (4 + x) * SL-DRX periods. x represents the number of extended evaluation periods, that is, based on 4 evaluation periods (evaluation time period without extension), the number of extended evaluation periods. This number of extensions is equivalent to / can be replaced by the number of extension times, that is, based on 4 evaluation periods, the maximum number of times to extend the evaluation period (each time extending one evaluation period). Among them, x < x_max. x_max represents the maximum number of extended evaluation periods. In some embodiments, x_max = 2y_max, and y_max represents the above-mentioned fifth parameter.

[0707] In some embodiments, the device further includes:

[0708] A trigger module 1802, configured to trigger the transmission of the synchronization signal when the synchronization source is unavailable.

[0709] In some embodiments, the availability of the synchronization source can be divided into two cases: (1) The synchronization source can be measured every time. In this case, the sidelink terminal directly compares the measured RSRP result with the threshold to determine whether to send the synchronization signal. (2) Although the RSRP result of the synchronization source is measured, the measurement of the synchronization source does not meet the measurement requirements (that is, the measurement result is unreliable). In some embodiments, not meeting the measurement requirements includes that the actual number of measurements of the synchronization source is less than the required number of measurements. For example, 4 cycles are required to be measured, but only 2 are measured. The following sidelink terminal behaviors provided in the embodiments of the present application can be used for the above-mentioned case (2). It should be noted that for the above-mentioned case (1), the following sidelink terminal behaviors provided in the embodiments of the present application can also be used.

[0710] In some embodiments, the device further includes:

[0711] A determination module 1803, configured to maintain the current synchronization signal transmission behavior when the synchronization source is available, or determine whether to transmit the synchronization signal according to the latest valid measurement result.

[0712] In some embodiments, the device further includes:

[0713] A determination module 1803, configured to determine whether to transmit the synchronization signal according to the terminal capabilities when the synchronization source is available.

[0714] In some embodiments, the device further includes:

[0715] A determination module 1803, configured to determine whether to transmit the synchronization signal according to the pre-configured information or the signaling of the network device when the synchronization source is available.

[0716] In some embodiments, the device further includes:

[0717] The determination module 1803 is configured to determine whether to transmit the synchronization signal according to the synchronization source priority or type of the synchronization source when the synchronization source is available.

[0718] In some embodiments, the determining module 1803 is configured to:

[0719] transmitting the synchronization signal when the synchronization source priority of the synchronization source is higher than a priority threshold;

[0720] In a case where the synchronization source priority of the synchronization source is lower than the priority threshold, the synchronization signal is not transmitted.

[0721] In some embodiments, the priority threshold is determined by at least one of the following methods:

[0722] The priority threshold is preset;

[0723] The priority threshold is determined according to the terminal capability;

[0724] The priority threshold is configured by the network device.

[0725] In some embodiments, the synchronization source being available includes an actual number of measurements of the synchronization source being less than a required number of measurements.

[0726] In some embodiments, the seventh parameter is an even multiple of the fifth parameter.

[0727] In some embodiments, the seventh parameter is twice the fifth parameter.

[0728] In some embodiments, the synchronization signal includes at least one of the following:

[0729] SLSS;

[0730] S-SSB.

[0731] In some embodiments, when a synchronization source is available, currently inaccurate measurements may be used to evaluate whether to transmit a synchronization signal.

[0732] In some embodiments, when the synchronization source is available, the sending of the synchronization signal is triggered, that is, the sending of the synchronization signal is triggered regardless of the value of the measurement result.

[0733] In some embodiments, the above-mentioned behaviors when the synchronization source is available can be freely combined and applied. For example, the synchronization signal is sent only when both the signaling configuration and priority conditions are met. The synchronization signal is not sent when either condition is not met.

[0734] In some embodiments, the apparatus provided by the embodiments of the present application includes an extension module 1801, which supports the execution of all extension-related steps performed by the sideline terminal in the above-mentioned embodiments.

[0735] In some embodiments, the apparatus provided by the embodiments of the present application includes multiple extension modules 1801, and the multiple extension modules 1801 respectively support the execution of some extension-related steps performed by the sideline terminal in each of the above embodiments.

[0736] In some embodiments, the steps performed by different extension modules 1801 are exactly the same, partially the same, or completely different.

[0737] In some embodiments, the apparatus provided by the embodiments of the present application includes a trigger module 1802, which supports the execution of all trigger-related steps performed by the sideline terminal in the above-mentioned various embodiments.

[0738] In some embodiments, the apparatus provided by the embodiments of the present application includes multiple trigger modules 1802, and the multiple trigger modules 1802 respectively support the execution of some trigger-related steps performed by the sideline terminal in each of the above embodiments.

[0739] In some embodiments, the steps performed by different trigger modules 1802 are exactly the same, partially the same, or completely different.

[0740] In some embodiments, the apparatus provided by the embodiments of the present application includes a determination module 1803, which supports the execution of all determination-related steps performed by the sideline terminal in each of the above embodiments.

[0741] In some embodiments, the apparatus provided by the embodiments of the present application includes multiple determination modules 1803, and the multiple determination modules 1803 respectively support the execution of some of the determination-related steps performed by the sideline terminal in each of the above embodiments.

[0742] In some embodiments, the steps performed by different determination modules 1803 are completely the same, partially the same, or completely different.

[0743] In summary, the apparatus provided in this embodiment clarifies how to determine the evaluation period in the SL-U by clarifying how to extend the evaluation period when evaluating a synchronization source in the SL-U. By correlating the extension of the evaluation period with the measurement period, this provides a reasonable method for setting the evaluation period, helping to clarify the relevant behavior of the sideline terminal through the evaluation of the evaluation period.

[0744] It should be noted that the device provided in the above embodiment only uses the division of the above-mentioned functional modules as an example to implement its functions. In actual applications, the above-mentioned functions can be assigned to different functional modules according to actual needs, that is, the content structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0745] Regarding the apparatus in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0746] Figure 19 is a structural diagram of a communication device provided by an exemplary embodiment of the present application. The communication device is a sideline terminal. The communication device 1900 includes: a processor 1901, a receiver 1902, a transmitter 1903, a memory 1904 and a bus 1905.

[0747] The processor 1901 includes one or more processing cores. The processor 1901 executes various functional applications and information processing by running software programs and modules.

[0748] The receiver 1902 and the transmitter 1903 may be implemented as a communication component, which may be a communication chip.

[0749] The memory 1904 is connected to the processor 1901 via a bus 1905. The memory 1904 may be used to store at least one instruction, and the processor 1901 may be used to execute the at least one instruction to implement each step in the above method embodiment.

[0750] In addition, the memory 1904 can be implemented by any type of volatile or non-volatile storage device or a combination thereof. Volatile or non-volatile storage devices include but are not limited to: magnetic disks or optical disks, electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), static random-access memory (SRAM), read-only memory (ROM), magnetic memory, flash memory, and programmable read-only memory (PROM).

[0751] In some embodiments, processor 1901 is configured to extend the detection period if a first sampling result within the detection period does not satisfy a first condition; wherein the detection period is used to detect the synchronization source via SL-U. In some embodiments, processor 1901 is further configured to perform other steps related to detection processing in the above method embodiments.

[0752] In some embodiments, the processor 1901 is configured to, during measurement of the first synchronization source of the SL-U, determine that the first synchronization source is unavailable if the second condition is met. In some embodiments, the processor 1901 is further configured to execute other steps related to measurement processing in the above method embodiments.

[0753] In some embodiments, processor 1901 is configured to extend an evaluation period using a seventh parameter, the evaluation period being used to evaluate measurement results of a currently selected synchronization source in the SL-U, the evaluation results being used to trigger transmission of a synchronization signal; wherein the seventh parameter is related to the fifth parameter, the fifth parameter being used to extend the measurement period to a maximum measurement period, the measurement period being used to measure the synchronization source. In some embodiments, processor 1901 is further configured to perform other steps related to the evaluation process in the aforementioned method embodiments.

[0754] In some embodiments, the receiver 1902 receives signals / data independently, or the processor 1901 controls the receiver 1902 to receive signals / data, or the processor 1901 requests the receiver 1902 to receive signals / data, or the processor 1901 cooperates with the receiver 1902 to receive signals / data.

[0755] In some embodiments, the transmitter 1903 independently sends signals / data, or the processor 1901 controls the transmitter 1903 to send signals / data, or the processor 1901 requests the transmitter 1903 to send signals / data, or the processor 1901 cooperates with the transmitter 1903 to send signals / data.

[0756] In some embodiments, the processor 1901 and the receiver 1902 may be implemented as one module, or the processor 1901 may be implemented as a part of the receiver 1902 .

[0757] In some embodiments, the receiver 1902 may be implemented as a receiver. Optionally, the receiver includes the processor 1901 or does not include the processor 1901.

[0758] In some embodiments, the processor 1901 and the transmitter 1903 may be implemented as one module, or the processor 1901 may be implemented as a part of the transmitter 1903 .

[0759] In some embodiments, the transmitter 1903 may be implemented as a transmitter. Optionally, the receiver includes the processor 1901 or does not include the processor 1901.

[0760] In an exemplary embodiment, a computer-readable storage medium is also provided, in which at least one instruction, at least one program, code set or instruction set is stored. The at least one instruction, the at least one program, the code set or instruction set is loaded and executed by a processor to implement the detection method, measurement method or evaluation method provided by the above-mentioned various method embodiments.

[0761] In an exemplary embodiment, a chip is also provided, which includes a programmable logic circuit and / or program instructions. When the chip is running on a communication device, it is used to implement the detection method, measurement method or evaluation method provided by the above-mentioned various method embodiments based on the programmable logic circuit and / or program.

[0762] In an exemplary embodiment, a computer program product is further provided. When the computer program product is run on a processor of a computer device, the computer device is caused to perform the above detection method, measurement method, or evaluation method.

[0763] In an exemplary embodiment, a computer program is further provided. The computer program includes computer instructions. A processor of a computer device executes the computer instructions, so that the computer device performs the above-mentioned detection method, measurement method, or evaluation method.

[0764] Those skilled in the art will appreciate that in one or more of the above examples, the functions described in the embodiments of the present application can be implemented using hardware, software, firmware, or any combination thereof. When implemented using software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein communication media include any media that facilitates the transmission of computer programs from one place to another. The storage medium can be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0765] The above description is merely an exemplary embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A detection method, characterized in that: The method is performed by a sideline terminal, and includes: If the first sampling result within the detection time period does not meet the first condition, extending the detection time period; The detection time period is used to detect a synchronization source via an unlicensed sidelink SL-U.

2. The method according to claim 1, characterized in that The detection time period includes one or more basic detection time periods, and the basic detection time period is used to extend the detection time period.

3. The method according to claim 2, characterized in that The detection time period includes the multiple basic detection time periods, and the first sampling result is determined according to the second sampling result of each basic detection time period in the multiple basic detection time periods.

4. The method according to claim 3, characterized in that When the first sampling result within the detection time period does not meet the first condition, extending the detection time period includes: When the first sampling result within the detection time period does not satisfy the first condition, the detection time period is extended by m basic detection time periods, where m is a positive integer.

5. The method according to claim 3, characterized in that: The method further comprises: When the first sampling result within the detection time period satisfies the first condition, stop extending the detection time period.

6. The method according to claim 4, characterized in that The first sampling result includes a sampling result for a synchronization signal, and each of the basic detection time periods is used to sample the synchronization signal n times, where n is a positive integer.

7. The method according to claim 4, characterized in that The number of extensions corresponding to the detection time period is less than the first parameter, and the number of extensions is the number of times the detection time period cumulatively extends the basic detection time period.

8. The method according to claim 7, characterized in that The method further comprises: When the extension number is greater than the first parameter, it is determined that the synchronization source is not detected.

9. The method according to claim 2, characterized in that: When the first sampling result within the detection time period does not meet the first condition, extending the detection time period includes: When the first sampling result within the detection time period does not satisfy the first condition, the detection time period is extended by a first parameter number of basic detection time periods, and the extended detection time period includes the first parameter + 1 basic detection time period.

10. The method according to claim 9, characterized in that The first sampling result includes a sampling result for a synchronization signal, and each of the basic detection time periods includes one or more detection cycles; the method further includes: Within the first parameter+1 basic detection time period, (1+first parameter)*n detection cycles are selected to perform synchronization signal sampling, where n is a positive integer.

11. The method according to claim 9, characterized in that The method further comprises: When the sampling result within the first parameter+1 basic detection time period does not satisfy the first condition, it is determined that the synchronization source is not detected.

12. The method according to claim 6 or 10, characterized in that: The first condition includes at least one of the following: The cumulative number of sampling of the synchronization signal within the detection time period is greater than or equal to a second parameter; The time interval between two adjacent synchronization signal samplings shall not exceed the third parameter.

13. The method according to any one of claims 7 to 11, characterized in that: The first parameter is related to the sidelink discontinuous reception (SL-DRX) configuration.

14. The method according to claim 13, characterized in that In the case of non-SL-DRX or the SL-DRX cycle is less than the first value, the first parameter is the first value.

15. The method according to claim 13, characterized in that When the SL-DRX cycle is greater than the first value, the first parameter is a second value.

16. The method according to any one of claims 7 to 11, characterized in that: The first parameter is related to the synchronization source priority of the current synchronization source of the sideline terminal.

17. The method according to claim 12, characterized in that The second parameter is determined in at least one of the following ways: The second parameter is preset; The second parameter is determined according to the terminal capability; The second parameter is configured by the network device.

18. The method according to claim 12, characterized in that The third parameter is determined in at least one of the following ways: The third parameter is preset; The third parameter is determined according to the terminal capability; The third parameter is configured by the network device.

19. The method according to claim 6 or 10, characterized in that: The synchronization signal includes at least one of the following: Sidelink synchronization signal SLSS; Sidelink synchronization signal block S-SSB.

20. The method according to any one of claims 2 to 11, characterized in that: The basic detection time period includes at least one of the following: One or more SLSS cycles; One or more S-SSB periods; One or more SL-DRX cycles.

21. A measurement method, characterized in that: The method is performed by a sideline terminal, and includes: During the measurement of the first synchronization source of the SL-U, when the second condition is met, it is determined that the first synchronization source is unavailable.

22. The method according to claim 21, characterized in that The method further comprises: When the first synchronization source is unavailable, the measurement of the first synchronization source is stopped.

23. The method according to claim 22, characterized in that The method further comprises: In the case where the first synchronization source is the synchronization source currently selected by the sideline terminal, synchronization source detection is triggered.

24. The method according to claim 22, characterized in that The method further comprises: In the case where the first synchronization source is the synchronization source currently selected by the sideline terminal, before the sideline terminal selects the second synchronization source, the synchronization signal is sent according to the local timing trigger.

25. The method according to claim 22, characterized in that The method further comprises: In case the first synchronization source is a candidate synchronization source, a second synchronization source is detected and measured.

26. The method according to any one of claims 21 to 25, characterized in that: The second condition includes at least one of the following: No measurement result is measured for consecutive fourth parameter maximum measurement time periods, wherein the maximum measurement time period is obtained by extending the measurement time period by the fifth parameter; No measurement result is measured for a sixth parameter number of measurement cycles in a row, each of the measurement time periods including a plurality of the measurement cycles; No measurement result was measured during the first duration.

27. The method according to any one of claims 21 to 25, characterized in that: The method further comprises: During the process of measuring the first synchronization source, if the second condition is not satisfied, it is determined that the first synchronization source is available.

28. The method according to claim 26, characterized in that The fourth parameter is determined in at least one of the following ways: The fourth parameter is preset; The fourth parameter is determined according to the terminal capability; The fourth parameter is configured by the network device; The fourth parameter is determined according to the synchronization source priority or type of the first synchronization source; The fourth parameter is determined according to the synchronization source priority or type of the synchronization source currently selected by the sideline terminal.

29. The method according to claim 26, characterized in that The sixth parameter is determined in at least one of the following ways: The sixth parameter is preset; The sixth parameter is determined according to the terminal capability; The sixth parameter is configured by the network device; The sixth parameter is determined according to the synchronization source priority or type of the first synchronization source; The sixth parameter is determined according to the synchronization source priority or type of the synchronization source currently selected by the sideline terminal.

30. The method according to claim 26, characterized in that The first duration is determined in at least one of the following ways: The first duration is preset; The first duration is determined according to the terminal capability; The first duration is configured by the network device; The first duration is determined according to a synchronization source priority or type of the first synchronization source; The first duration is determined according to the synchronization source priority or type of the synchronization source currently selected by the sideline terminal.

31. An evaluation method, characterized in that: The method is performed by a sideline terminal, and includes: Extending the evaluation time period by the seventh parameter, wherein the evaluation time period is used to evaluate the measurement result of the currently selected synchronization source in the SL-U, and the evaluation result is used to trigger the transmission of the synchronization signal; The seventh parameter is related to the fifth parameter, and the fifth parameter is used to extend the measurement time period to a maximum measurement time period, and the measurement time period is used to measure the synchronization source.

32. The method according to claim 31, characterized in that The method further comprises: In the case that the synchronization source is unavailable, the synchronization signal transmission is triggered.

33. The method according to claim 31, characterized in that The method further comprises: When the synchronization source is available, the current synchronization signal transmission behavior is maintained, or whether to transmit the synchronization signal is determined according to the latest valid measurement result.

34. The method according to claim 31, characterized in that The method further comprises: When the synchronization source is available, whether to transmit the synchronization signal is determined according to the terminal capability.

35. The method according to claim 31, characterized in that The method further comprises: When the synchronization source is available, whether to transmit the synchronization signal is determined according to pre-configuration information or signaling of the network device.

36. The method according to claim 31, characterized in that The method further comprises: When the synchronization source is available, whether to transmit the synchronization signal is determined according to the synchronization source priority or type of the synchronization source.

37. The method according to claim 36, characterized in that The determining whether to transmit the synchronization signal according to the synchronization source priority of the synchronization source includes: When the synchronization source priority of the synchronization source is higher than the priority threshold, transmitting the synchronization signal; In the case where the synchronization source priority of the synchronization source is lower than the priority threshold, the synchronization signal is not transmitted.

38. The method according to claim 37, characterized in that The priority threshold is determined in at least one of the following ways: The priority threshold is preset; The priority threshold is determined according to the terminal capability; The priority threshold is configured by the network device.

39. The method according to any one of claims 33 to 38, characterized in that The synchronization source being available includes an actual number of measurements of the synchronization source being less than a required number of measurements.

40. The method according to any one of claims 31 to 38, characterized in that The seventh parameter is an even multiple of the fifth parameter.

41. The method according to claim 40, characterized in that The seventh parameter is twice the fifth parameter.

42. The method according to any one of claims 31 to 38, characterized in that The synchronization signal includes at least one of the following: SLSS; S-SSB.

43. A detection device, characterized in that: The device comprises: An extension module, configured to extend the detection time period if a first sampling result within the detection time period does not satisfy a first condition; The detection time period is used to detect the synchronization source through SL-U.

44. The method according to claim 43, characterized in that The detection time period includes one or more basic detection time periods, and the basic detection time period is used to extend the detection time period.

45. The device according to claim 44, characterized in that The detection time period includes the multiple basic detection time periods, and the first sampling result is determined according to the second sampling result of each basic detection time period in the multiple basic detection time periods.

46. ​​The device according to claim 45, characterized in that The extension module is used for: When the first sampling result within the detection time period does not satisfy the first condition, the detection time period is extended by m basic detection time periods, where m is a positive integer.

47. The device according to claim 45, characterized in that The device also includes: A stopping module is used to stop extending the detection time period if the first sampling result within the detection time period meets the first condition.

48. The device according to claim 46, characterized in that The first sampling result includes a sampling result for a synchronization signal, and each of the basic detection time periods is used to sample the synchronization signal n times, where n is a positive integer.

49. The device according to claim 46, characterized in that The number of extensions corresponding to the detection time period is less than the first parameter, and the number of extensions is the number of times the detection time period cumulatively extends the basic detection time period.

50. The device according to claim 49, characterized in that The device also includes: A determination module is used to determine that the synchronization source is not detected when the extension number is greater than the first parameter.

51. The device according to claim 44, characterized in that The extension module is used for: When the first sampling result within the detection time period does not satisfy the first condition, the detection time period is extended by a first parameter number of basic detection time periods, and the extended detection time period includes the first parameter + 1 basic detection time period.

52. The device according to claim 51, characterized in that The first sampling result includes a sampling result for a synchronization signal, and each of the basic detection time periods includes one or more detection cycles; the device further includes: The selection module is used to select (1+first parameter)*n detection cycles for synchronous signal sampling within the first parameter+1 basic detection time period, where n is a positive integer.

53. The device according to claim 51, characterized in that The device also includes: A determination module is used to determine that the synchronization source is not detected when the sampling result within the first parameter+1 basic detection time period does not meet the first condition.

54. The device according to claim 48 or 52, characterized in that The first condition includes at least one of the following: The cumulative number of sampling of the synchronization signal within the detection time period is greater than or equal to a second parameter; The time interval between two adjacent synchronization signal samplings shall not exceed the third parameter.

55. The device according to any one of claims 49 to 53, characterized in that The first parameter is related to the SL-DRX configuration.

56. The device according to claim 55, characterized in that In the case of non-SL-DRX or the SL-DRX cycle is less than the first value, the first parameter is the first value.

57. The device according to claim 55, characterized in that When the SL-DRX cycle is greater than the first value, the first parameter is a second value.

58. The device according to any one of claims 49 to 53, characterized in that The first parameter is related to the synchronization source priority of the current synchronization source of the sideline terminal.

59. The device according to claim 54, characterized in that The second parameter is determined in at least one of the following ways: The second parameter is preset; The second parameter is determined according to the terminal capability; The second parameter is configured by the network device.

60. The device according to claim 54, characterized in that The third parameter is determined in at least one of the following ways: The third parameter is preset; The third parameter is determined according to the terminal capability; The third parameter is configured by the network device.

61. The device according to claim 48 or 52, characterized in that The synchronization signal includes at least one of the following: SLSS; S-SSB.

62. The device according to any one of claims 44 to 53, characterized in that The basic detection time period includes at least one of the following: One or more SLSS cycles; One or more S-SSB periods; One or more SL-DRX cycles.

63. A measuring device, characterized in that: The device comprises: The determination module is used to determine that the first synchronization source of the SL-U is unavailable when a second condition is met during the measurement of the first synchronization source of the SL-U.

64. The device according to claim 63, characterized in that The device also includes: The stopping module is used to stop measuring the first synchronization source when the first synchronization source is unavailable.

65. The device according to claim 64, characterized in that The device also includes: The trigger module is used to trigger synchronization source detection when the first synchronization source is the synchronization source currently selected by the sideline terminal.

66. The device according to claim 64, characterized in that The device also includes: The trigger module is used to trigger the sending of synchronization signals according to local timing before the sideline terminal selects a second synchronization source, when the first synchronization source is the synchronization source currently selected by the sideline terminal.

67. The device according to claim 64, characterized in that The device also includes: The trigger module is used to detect and measure the second synchronization source when the first synchronization source is a candidate synchronization source.

68. The device according to any one of claims 63 to 67, characterized in that The second condition includes at least one of the following: No measurement result is measured for consecutive fourth parameter maximum measurement time periods, wherein the maximum measurement time period is obtained by extending the measurement time period by the fifth parameter; No measurement result is measured for a sixth parameter number of measurement cycles in a row, each of the measurement time periods including a plurality of the measurement cycles; No measurement result was measured during the first duration.

69. The device according to any one of claims 63 to 67, characterized in that The determining module is used to: During the process of measuring the first synchronization source, if the second condition is not satisfied, it is determined that the first synchronization source is available.

70. The device according to claim 68, characterized in that The fourth parameter is determined in at least one of the following ways: The fourth parameter is preset; The fourth parameter is determined according to the terminal capability; The fourth parameter is configured by the network device; The fourth parameter is determined according to the synchronization source priority or type of the first synchronization source; The fourth parameter is determined according to the synchronization source priority or type of the synchronization source currently selected by the sideline terminal.

71. The device according to claim 68, characterized in that The sixth parameter is determined in at least one of the following ways: The sixth parameter is preset; The sixth parameter is determined according to the terminal capability; The sixth parameter is configured by the network device; The sixth parameter is determined according to the synchronization source priority or type of the first synchronization source; The sixth parameter is determined according to the synchronization source priority or type of the synchronization source currently selected by the sideline terminal.

72. The device according to claim 68, characterized in that The first duration is determined in at least one of the following ways: The first duration is preset; The first duration is determined according to the terminal capability; The first duration is configured by the network device; The first duration is determined according to a synchronization source priority or type of the first synchronization source; The first duration is determined according to the synchronization source priority or type of the synchronization source currently selected by the sideline terminal.

73. An evaluation device, characterized in that The device comprises: An extension module, used to extend the evaluation time period by a seventh parameter, wherein the evaluation time period is used to evaluate the measurement result of the currently selected synchronization source in the SL-U, and the evaluation result is used to trigger the transmission of the synchronization signal; The seventh parameter is related to the fifth parameter, and the fifth parameter is used to extend the measurement time period to a maximum measurement time period, and the measurement time period is used to measure the synchronization source.

74. The device according to claim 73, characterized in that The device also includes: The trigger module is used to trigger the transmission of the synchronization signal when the synchronization source is unavailable.

75. The device according to claim 73, characterized in that The device also includes: The determination module is used to maintain the current synchronization signal transmission behavior when the synchronization source is available, or to determine whether to transmit the synchronization signal according to the latest valid measurement result.

76. The device according to claim 73, characterized in that The device also includes: The determination module is used to determine whether to transmit the synchronization signal according to the terminal capability when the synchronization source is available.

77. The device according to claim 73, characterized in that The device also includes: The determination module is used to determine whether to transmit the synchronization signal according to pre-configuration information or signaling of the network device when the synchronization source is available.

78. The device according to claim 73, characterized in that The device also includes: The determination module is used to determine whether to transmit the synchronization signal according to the synchronization source priority or type of the synchronization source when the synchronization source is available.

79. The device according to claim 78, characterized in that The determining module is used to: When the synchronization source priority of the synchronization source is higher than the priority threshold, transmitting the synchronization signal; In the case where the synchronization source priority of the synchronization source is lower than the priority threshold, the synchronization signal is not transmitted.

80. The device according to claim 79, characterized in that The priority threshold is determined in at least one of the following ways: The priority threshold is preset; The priority threshold is determined according to the terminal capability; The priority threshold is configured by the network device.

81. The device according to any one of claims 75 to 80, characterized in that The synchronization source being available includes an actual number of measurements of the synchronization source being less than a required number of measurements.

82. The device according to any one of claims 73 to 80, characterized in that The seventh parameter is an even multiple of the fifth parameter.

83. The device according to claim 82, characterized in that The seventh parameter is twice the fifth parameter.

84. The device according to claims 73 to 80, characterized in that The synchronization signal includes at least one of the following: SLSS; S-SSB.

85. A side-line terminal, characterized in that: The side line terminal comprises: processor; a transceiver connected to the processor; a memory for storing executable instructions for the processor; Wherein, the processor is configured to extend the detection time period if the first sampling result within the detection time period does not satisfy the first condition; The detection time period is used to detect the synchronization source through SL-U.

86. The side line terminal according to claim 85, characterized in that: The detection time period includes one or more basic detection time periods, and the basic detection time period is used to extend the detection time period.

87. The side line terminal according to claim 86, characterized in that: The detection time period includes a plurality of basic detection time periods, and the first sampling result is determined according to a second sampling result of each basic detection time period in the plurality of basic detection time periods.

88. The side line terminal according to claim 87, characterized in that: The processor is configured to, if a first sampling result within the detection time period does not satisfy the first condition, extend the detection time period by m basic detection time periods, where m is a positive integer.

89. The side line terminal according to claim 87, characterized in that: The processor is configured to stop extending the detection time period if a first sampling result within the detection time period satisfies the first condition.

90. The side line terminal according to claim 88, characterized in that: The first sampling result includes a sampling result for a synchronization signal, and each of the basic detection time periods is used to sample the synchronization signal n times, where n is a positive integer.

91. The side line terminal according to claim 88, characterized in that: The number of extensions corresponding to the detection time period is less than the first parameter, and the number of extensions is the number of times the detection time period cumulatively extends the basic detection time period.

92. The side line terminal according to claim 91, characterized in that: The processor is configured to determine that the synchronization source is not detected if the extension number is greater than the first parameter.

93. The side line terminal according to claim 86, characterized in that: The processor is configured to extend the detection time period by a first parameter number of basic detection time periods if a first sampling result within the detection time period does not satisfy the first condition, wherein the extended detection time period includes the first parameter+1 basic detection time period.

94. The side line terminal according to claim 93, characterized in that: The first sampling result includes a sampling result for a synchronization signal, and each of the basic detection time periods includes one or more detection cycles; the processor is configured to select (1+first parameter)*n detection cycles to sample the synchronization signal within the first parameter+1 basic detection time period, where n is a positive integer.

95. The side line terminal according to claim 93, characterized in that: The processor is configured to determine that the synchronization source is not detected if a sampling result within the first parameter+1 basic detection time period does not satisfy the first condition.

96. The side line terminal according to claim 90 or 94, characterized in that: The first condition includes at least one of the following: The cumulative number of sampling of the synchronization signal within the detection time period is greater than or equal to a second parameter; The time interval between two adjacent synchronization signal samplings shall not exceed the third parameter.

97. The side line terminal according to any one of claims 91 to 95, characterized in that: The first parameter is related to the SL-DRX configuration.

98. The side line terminal according to claim 97, characterized in that: In the case of non-SL-DRX or the SL-DRX cycle is less than the first value, the first parameter is the first value.

99. The side line terminal according to claim 97, characterized in that: When the SL-DRX cycle is greater than the first value, the first parameter is a second value.

100. The side line terminal according to any one of claims 91 to 95, characterized in that: The first parameter is related to the synchronization source priority of the current synchronization source of the sideline terminal.

101. The side line terminal according to claim 96, characterized in that: The second parameter is determined in at least one of the following ways: The second parameter is preset; The second parameter is determined according to the terminal capability; The second parameter is configured by the network device.

102. The side line terminal according to claim 96, characterized in that: The third parameter is determined in at least one of the following ways: The third parameter is preset; The third parameter is determined according to the terminal capability; The third parameter is configured by the network device.

103. The side line terminal according to claim 90 or 94, characterized in that: The synchronization signal includes at least one of the following: SLSS; S-SSB.

104. The side line terminal according to any one of claims 86 to 95, characterized in that: The basic detection time period includes at least one of the following: One or more SLSS cycles; One or more S-SSB periods; One or more SL-DRX cycles.

105. A side-line terminal, characterized in that: The side line terminal comprises: processor; a transceiver connected to the processor; a memory for storing executable instructions for the processor; The processor is configured to, during measurement of a first synchronization source of the SL-U, determine that the first synchronization source is unavailable if a second condition is met.

106. The side line terminal according to claim 105, characterized in that: The processor is configured to stop measuring the first synchronization source if the first synchronization source is unavailable.

107. The side line terminal according to claim 106, characterized in that: The processor is configured to trigger synchronization source detection when the first synchronization source is a synchronization source currently selected by the sideline terminal.

108. The side line terminal according to claim 106, characterized in that: The processor is configured to, when the first synchronization source is the synchronization source currently selected by the sideline terminal, trigger the sending of a synchronization signal according to local timing before the sideline terminal selects a second synchronization source.

109. The side line terminal according to claim 106, characterized in that: The processor is configured to detect and measure a second synchronization source if the first synchronization source is a candidate synchronization source.

110. The side line terminal according to any one of claims 105 to 109, characterized in that: The second condition includes at least one of the following: No measurement result is measured for consecutive fourth parameter maximum measurement time periods, wherein the maximum measurement time period is obtained by extending the measurement time period by the fifth parameter; No measurement result is measured for a sixth parameter number of measurement cycles in a row, each of the measurement time periods including a plurality of the measurement cycles; No measurement result was measured during the first duration.

111. The side line terminal according to any one of claims 105 to 109, characterized in that: The processor is configured to, during measurement of the first synchronization source, determine that the first synchronization source is available if the second condition is not satisfied.

112. The side line terminal according to claim 110, characterized in that: The fourth parameter is determined in at least one of the following ways: The fourth parameter is preset; The fourth parameter is determined according to the terminal capability; The fourth parameter is configured by the network device; The fourth parameter is determined according to the synchronization source priority or type of the first synchronization source; The fourth parameter is determined according to the synchronization source priority or type of the synchronization source currently selected by the sideline terminal.

113. The side line terminal according to claim 110, characterized in that: The sixth parameter is determined in at least one of the following ways: The sixth parameter is preset; The sixth parameter is determined according to the terminal capability; The sixth parameter is configured by the network device; The sixth parameter is determined according to the synchronization source priority or type of the first synchronization source; The sixth parameter is determined according to the synchronization source priority or type of the synchronization source currently selected by the sideline terminal.

114. The side line terminal according to claim 110, characterized in that: The first duration is determined in at least one of the following ways: The first duration is preset; The first duration is determined according to the terminal capability; The first duration is configured by the network device; The first duration is determined according to a synchronization source priority or type of the first synchronization source; The first duration is determined according to the synchronization source priority or type of the synchronization source currently selected by the sideline terminal.

115. A side-line terminal, characterized in that: The side line terminal comprises: processor; a transceiver connected to the processor; a memory for storing executable instructions for the processor; The processor is configured to extend an evaluation time period by a seventh parameter, wherein the evaluation time period is used to evaluate a measurement result of a currently selected synchronization source in the SL-U, and the evaluation result is used to trigger transmission of a synchronization signal; The seventh parameter is related to the fifth parameter, and the fifth parameter is used to extend the measurement time period to a maximum measurement time period, and the measurement time period is used to measure the synchronization source.

116. The side line terminal according to claim 115, characterized in that: The processor is configured to trigger the synchronization signal transmission if the synchronization source is unavailable.

117. The side line terminal according to claim 115, characterized in that: The processor is configured to maintain a current synchronization signal transmission behavior when the synchronization source is available, or determine whether to transmit the synchronization signal according to the latest valid measurement result.

118. The side line terminal according to claim 115, characterized in that: The processor is configured to determine whether to transmit the synchronization signal according to terminal capabilities when the synchronization source is available.

119. The side line terminal according to claim 115, characterized in that: The processor is configured to determine whether to transmit the synchronization signal according to pre-configuration information or signaling of a network device when the synchronization source is available.

120. The side line terminal according to claim 115, characterized in that: The processor is configured to determine whether to transmit the synchronization signal according to a synchronization source priority or type of the synchronization source when the synchronization source is available.

121. The side line terminal according to claim 120, characterized in that: The processor is configured to transmit the synchronization signal when the synchronization source priority of the synchronization source is higher than a priority threshold; and not transmit the synchronization signal when the synchronization source priority of the synchronization source is lower than the priority threshold.

122. The side line terminal according to claim 121, characterized in that: The priority threshold is determined in at least one of the following ways: The priority threshold is preset; The priority threshold is determined according to the terminal capability; The priority threshold is configured by the network device.

123. The side line terminal according to any one of claims 117 to 122, characterized in that: The synchronization source being available includes an actual number of measurements of the synchronization source being less than a required number of measurements.

124. The side line terminal according to any one of claims 115 to 122, characterized in that: The seventh parameter is an even multiple of the fifth parameter.

125. The side line terminal according to claim 124, characterized in that: The seventh parameter is twice the fifth parameter.

126. The side line terminal according to claims 115 to 122, characterized in that: The synchronization signal includes at least one of the following: SLSS; S-SSB.

127. A computer-readable storage medium, characterized in that The readable storage medium stores executable instructions, which are loaded and executed by a processor to implement the detection method described in any one of claims 1 to 20, or the measurement method described in any one of claims 21 to 30, or the evaluation method described in any one of claims 31 to 42.

128. A chip, characterized in that: The chip includes a programmable logic circuit or a program, and the chip is used to implement the detection method described in any one of claims 1 to 20, or the measurement method described in any one of claims 21 to 30, or the evaluation method described in any one of claims 31 to 42 based on the programmable logic circuit or the program.

129. A computer program product, characterized in that The computer program product includes computer instructions, which are stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device performs the detection method described in any one of claims 1 to 20, or the measurement method described in any one of claims 21 to 30, or the evaluation method described in any one of claims 31 to 42.

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