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EP-4195746-B1 - DETECTION WINDOW ACQUISITION METHOD AND APPARATUS, AND TERMINAL

EP4195746B1EP 4195746 B1EP4195746 B1EP 4195746B1EP-4195746-B1

Inventors

  • PENG, Shuyan
  • JI, Zichao

Dates

Publication Date
20260506
Application Date
20210806

Claims (15)

  1. A method for obtaining a sensing window, performed by a terminal, wherein the method comprises: obtaining (101) first resource sensing windows according to at least one step size P in time; wherein the method further comprises: determining positions of the first resource sensing windows, and characterized in that the determining positions of the first resource sensing windows comprises: determining the positions of the first resource sensing windows as: some or all positions meeting Y-j*P within a preset range; wherein Y is a resource in a resource selection window of the terminal, j is a value obtained according to a predefined or pre-configured or configured parameter, and P is the step size in time; and the preset range comprises at least one of the following: a range between a starting position of an optional resource sensing window and a starting position of the resource selection window; a range starting backward from a starting position of an optional resource sensing window for a preset time to a starting position of the resource selection window; a range between a starting position of an optional resource sensing window and an ending position of the optional resource sensing window; a range starting backward from a starting position of an optional resource sensing window for a preset time to an ending position of the optional resource sensing window; a range between a starting position of the resource sensing window and a resource selection trigger moment; a range starting backward from a starting position of the resource sensing window for a preset time to a resource selection trigger moment; a range between an optional starting position of the resource sensing window and a resource selection trigger moment; a range starting backward from an optional starting position of the resource sensing window for a preset time to a resource selection trigger moment; a range between an ending position of the resource sensing window and a resource selection trigger moment; a range starting backward from an ending position of the resource sensing window for a preset time to a resource selection trigger moment; a range between an optional ending position of the resource sensing window and a resource selection trigger moment; a range starting backward from an optional ending position of the resource sensing window for a preset time to a resource selection trigger moment; a range starting forward from a starting position of the resource selection window for a time length T0 to the starting position of the resource selection window; or a range starting forward from a starting position of the resource selection window for a time length T0 and then backward for a preset time to the starting position of the resource selection window.
  2. The method according to claim 1, further comprising at least one of the following: determining the step size P in time according to a periodicity value configured in a resource pool; determining the step size P in time according to a periodicity value configured by a terminal; determining the step size P in time according to a periodicity value of sidelink discontinuous reception, DRX; or determining the step size P in time according to predefinition, or pre-configuration, or configuration.
  3. The method according to claim 1 or 2, wherein a value of the step size P in time is less than or equal to a first value, wherein the first value is a predefined value, or a pre-configured value, or a configured value, or a value determined according to a terminal capability, or a value determined according to quality of service.
  4. The method according to claim 2, wherein the determining the step size P in time according to a periodicity value configured in a resource pool comprises at least one of the following: determining the step size P in time according to a least common multiple of some or all the periodicity values configured in the resource pool; determining the step size P in time according to a greatest common divisor of some or all the periodicity values configured in the resource pool; or determining the step size P in time corresponding to the periodicity value configured in the resource pool according to a step size value corresponding to a predefined or pre-configured or configured periodicity value range.
  5. The method according to claim 2, wherein if there are M1 periodicity values meeting a first rule in the periodicity value configured in the resource pool, wherein M1 is a predefined or pre-configured or configured value, the determining the step size P in time according to a periodicity value configured in a resource pool comprises at least one of the following: determining that the step size P in time comprises 100 milliseconds; determining that the step size P in time comprises a greatest common divisor of some or all the periodicity values meeting the first rule; or determining that the step size P in time comprises a least common multiple of some or all the periodicity values meeting the first rule.
  6. The method according to claim 2, wherein if there are M2 periodicity values meeting a second rule in the periodicity value configured in the resource pool, wherein M2 is a predefined or pre-configured or configured value, the determining the step size P in time according to a periodicity value configured in a resource pool comprises at least one of the following: determining that the step size P in time comprises a least common multiple of some or all the periodicity values meeting the second rule; determining that the step size P in time comprises a greatest common divisor of some or all the periodicity values meeting the second rule; determining that the step size P in time comprises a least common multiple of quantized values of some or all the periodicity values meeting the second rule; or determining that the step size P in time comprises a greatest common divisor of quantized values of some or all the periodicity values meeting the second rule.
  7. The method according to claim 2, wherein values of the at least one step size P in time are equal to some or all values of non-zero periodicity values in the resource pool; or, the determining the step size P in time according to a periodicity value configured by a terminal comprises: determining that the step size P in time is equal to the periodicity value configured by the terminal; or, the determining the step size P in time according to a periodicity value of sidelink discontinuous reception, DRX, comprises: determining that the step size P in time is equal to the periodicity value of the sidelink DRX.
  8. The method according to claim 1, wherein the method further comprises: determining a quantity of the first resource sensing windows.
  9. The method according to claim 8, wherein the quantity of the first resource sensing windows comprises an optional quantity of the first resource sensing windows, wherein the optional quantity of the first resource sensing windows is related to at least one of the following parameters: a predefined or pre-configured or configured quantity; a time length T1 between a starting position of the resource selection window and a resource selection trigger moment; a time length T1 min between an optional starting position of the resource selection window and a resource selection trigger moment; a time length T2 between an ending position of the resource selection window and a resource selection trigger moment n; a time length T2 max between an optional starting position of the resource selection window and a resource selection trigger moment; a time length T0 between a starting position of an optional resource sensing window and a resource selection trigger moment; predefined or pre-configured first processing time T proc , 0 SL ; predefined or pre-configured second processing time T proc , 1 SL ; or the step size P in time.
  10. The method according to claim 9, wherein the optional quantity of the first resource sensing windows comprises at least one of the following: T 1 + T 0 / P ; T 1 min + T 0 / P ; T 2 + T 0 / P T 2 max + T 0 / P T 0 / P ; T 0 − T proc , 0 SL / P ; T 0 + T proc , 1 SL − 100 / P ; T 1 + T 0 − 100 / P ; T 1 min + T 0 − 100 / P ; T 2 + T 0 − 100 / P ; T 2 max + T 0 − 100 / P ; T 0 − 100 / P ; T 0 − T proc , 0 SL − 100 / P ; T 0 + T proc , 1 SL − 100 / P ; or a predefined or pre-configured or configured quantity.
  11. The method according to claim 1, wherein the some positions are at least one of the following: first N positions; last N positions; first N positions after N-T0+100; or positions indicated by a bitmap, wherein N is an actual quantity of the first resource sensing windows, N is a predefined or pre-configured or configured value, or N is a value determined according to configuration information.
  12. The method according to claim 1, further comprising: performing resource exclusion with a first periodicity value or a first step size in time as a periodicity value according to at least one of a sensing result in the first resource sensing windows or a sensing result in a second resource sensing window obtained according to a resource selection window, wherein the first periodicity value is a periodicity value carried in sidelink control information received by the terminal in a corresponding resource sensing window; and the first step size in time is a step size corresponding to the periodicity value carried in the sidelink control information received by the terminal in the corresponding resource sensing window.
  13. The method according to claim 1, wherein the method further comprises: in a case that a first condition is met, obtaining (102) a second resource sensing window according to a resource selection window; otherwise, the first resource sensing windows are obtained, wherein the first condition comprises at least one of the following: a periodicity value configured by the terminal is less than a first periodicity value threshold; a periodicity value configured in the resource pool comprises one or more non-zero periodicity values less than a second periodicity value threshold; a periodicity value configured in the resource pool is not enabled; or a periodicity value configured by the terminal is 0.
  14. A terminal (400), comprising a processor (401), a memory (402), and a program or an instruction stored on the memory (402) and executable on the processor (401), the program or instruction, when executed by the processor (401), implementing steps of the method for obtaining a sensing window according to any one of claims 1 to 13.
  15. A computer readable storage medium, storing a program, the program, when executed by a processor of a terminal, causes the terminal to implement the steps of the method for obtaining a sensing window according to any one of claims 1 to 13.

Description

TECHNICAL FIELD This application belongs to the field of communications technologies, and specifically relates to a method and a terminal for obtaining a sensing window, and a computer readable storage medium. BACKGROUND A long term evolution (Long Term Evolution, LTE) system supports sidelink (sidelink) transmission, that is, data transmission directly performed between terminals (also known as User Equipment (UE)) on a physical layer. An LTE sidelink communicates based on broadcast. Although the LTE sidelink can be used for supporting basic security communication of vehicle to everything (vehicle to everything, V2X), it is not suitable for other more advanced V2X services. A 5G new radio (New Radio, NR) system supports more advanced sidelink transmission designs, such as unicast, multicast, groupcast, and the like, so as to support a more comprehensive service type. In LTE, partial sensing is mainly designed to save power, and to support communication between a pedestrian and a vehicle (Pedestrian to Vehicle, P2V). The terminal supports two modes of resource selection methods. In one method, resource selection is random. In another method, partial sensing is firstly performed, a resource is selected based on a result of the partial sensing, and semi-static resource reservation is performed. Which mode of resource selection methods is selected by the terminal is configured by radio resource control (Radio Resource Control, RRC). When the RRC is configured to support two modes of resource selection, the terminal decides which mode of resource selection is used. WO 2020/088678 A1 discloses a communication method, which includes the steps: a first terminal device determines a first parameter, where the first parameter is used to indicate a parameter of a sensing window, a parameter of a resource selection window, and/or a parameter of a first time window, and the first time window includes the sensing window and the resource selection window. The first terminal device determines a first resource pool from at least one resource pool based on the first parameter. The first terminal device selects a first resource from the first resource pool. The first terminal device transmits sidelink information on the first resource. US 2020/029245 A1 discloses that a vehicle UE (V-UE) or pedestrian UE (P-UE) can configure resources independently for communication with other V-UEs/P-UEs to avoid collision and ensure safety. The UEs can operate to independently monitor and configure their own resources via partial sensing window configurations that can dynamically configured to perform resource (re)selection in response to a resource reselection trigger. An exclusion of detected resources that are reduced or occupied by other devices can be performed, and a resource candidate set generated to select resource candidates for long term evolution (LTE) vehicular communications. UE partial sensing mechanisms and congestion control can be enhanced for these communications via efficient power control and signaling reliance for vehicle communication quality, as well as pedestrian safety. WO 2018/030825 A1 discloses a method for determining a resource of a communication by a terminal in a wireless communication system, the method comprising: receiving, from a base station, information on a minimum number of subframes for monitoring; determining a number of a plurality of subframes to be monitored based on the minimum number of subframes; identifying the plurality of subframes to be monitored for a sidelink transmission; and transmitting, to the base station, information indicating a set of subframes for the sidelink transmission selected based on the plurality of subframes. In a process of implementing this application, the inventor finds that there are at least the following problems in the prior art: In the LTE sidelink, a stride of partial sensing in a sidelink resource pool is fixed at 100 ms. For periodicity configuration in the LTE, a sensing window obtained by k*100 ms can basically sense a resource reservation condition of other UE in the resource pool. However, in NR, an optional value of a sensing periodicity is irregular. If the sensing window is obtained in a stride of 100 ms, resource reservation conditions of other terminals (for example, a terminal whose reservation periodicity value is [1:99]) in a selection window cannot be sensed, resulting in collision between a selected resource and a resource reserved by another terminal when the sensing terminal selects resources. SUMMARY The invention is set out by the appended set of claims. A purpose of embodiments of this application is to provide a method, a terminal and a computer readable storage medium as defined in the appended set of claims, which can solve a problem that a method for obtaining a sensing window in the prior art is not applicable to a 5G or a subsequent communication system. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flowchart of steps of a method fo