Method executed by user equipment, and user equipment

Abstract

The present disclosure provides a method executed by a user equipment (UE) and a UE. The method executed by the UE comprises the following steps: a UE receives from an upper layer an instruction which instructs the UE to send an SL-PRS, wherein the upper layer is a layer above an MAC layer of the UE; and in a case where the UE has an SL-PRS transmission that is triggered and has not been cancelled, when the MAC layer of the UE acquires or has one or more sidelink (SL) resources for transmission, and the resource is a dedicated resource for SL-PRS transmission, the MAC layer of the UE cancels the triggered SL-PRS transmission and instructs a physical layer to send the SL-PRS on the SL resource, and when the UE does not have the SL resource, the UE determines whether an SL resource allocation mode 1 is configured.

Description

Method performed by user equipment and user equipment Technical Field

[0001] The present disclosure relates to the technical field of wireless communications, and in particular to a method executed by a user equipment and corresponding user equipment. Background Art

[0002] Vehicle-to-Everything (V2X) is a new generation of information and communication technology that connects vehicles to everything. V represents the vehicle, and X represents anything that interacts with the vehicle. Currently, X primarily includes vehicles, people, roadside infrastructure, and networks.

[0003] In a pair of UEs performing V2X service communications, the UEs communicate via a sidelink (SL). A UE performing SL communication is also referred to as a SL UE.

[0004] One or more positioning and / or ranging technologies may also be supported in the wireless communication system. When positioning and / or ranging a UE, information such as the UE's position (e.g., absolute position; or relative position) and / or direction may be calculated or estimated based on measurements of reference signals used for positioning and ranging.

[0005] The UE can send a reference signal for positioning and ranging on the sidelink. Such a reference signal is called an SL-PRS. How the UE sends such a reference signal is a problem that needs to be solved.

[0006] Summary of the Invention

[0007] The present disclosure proposes a method performed by a user equipment and a corresponding user equipment to solve at least some of the above problems.

[0008] According to one aspect of the present invention, a method performed by a user equipment is provided, comprising the following steps:

[0009] The user equipment UE receives an instruction from an upper layer, instructing the UE to send a side link positioning reference signal SL-PRS, wherein the upper layer is above the media access control MAC layer of the UE;

[0010] In the case that there is a triggered and not cancelled SL-PRS transmission of the UE,

[0011] When the MAC layer of the UE obtains or has one or more SL resources for transmission, and the resource is a dedicated resource for SL-PRS transmission, the MAC layer of the UE cancels the triggered SL-PRS transmission and instructs the physical layer to send SL-PRS on the SL resource;

[0012] When the UE does not have the above-mentioned SL resources, the UE determines whether it is configured with side link resource allocation mode 1.

[0013] In the above method performed by the user equipment, preferably,

[0014] If the UE is configured with sidelink resource allocation mode 1, the UE triggers a scheduling request;

[0015] If the UE is not configured with sidelink resource allocation mode 1, the UE triggers resource pool selection and reselection.

[0016] In the above method performed by the user equipment, preferably,

[0017] The SL-PRS indicated by the upper layer of the UE is a periodically transmitted SL-PRS.

[0018] When the triggered SL-PRS transmission is canceled, the UE starts a timer T-PRS associated with the SL-PRS transmission, where the running duration of the timer T-PRS is equal to the transmission period of the SL-PRS.

[0019] In the above method performed by the user equipment, preferably,

[0020] When the upper layer of the UE instructs to stop or cancel the transmission of the SL-PRS,

[0021] If the associated timer T-PRS is running, the UE stops the running timer T-PRS;

[0022] If the UE has triggered SL-PRS transmission, the UE cancels the triggered SL-PRS transmission.

[0023] In the above method performed by the user equipment, preferably,

[0024] When the upper layer of the UE indicates the transmission of a new SL-PRS,

[0025] If there is a running timer T-PRS, the UE stops the running timer T-PRS;

[0026] If the UE has triggered SL-PRS transmission, the UE cancels the triggered SL-PRS transmission.

[0027] In the above method performed by the user equipment, preferably,

[0028] When at least one of the following conditions is met, it is determined to be a new SL-PRS transmission:

[0029] The transmission target address of the newly indicated SL-PRS is different from the transmission target address of the currently triggered SL-PRS;

[0030] The transmission target address of the newly indicated SL-PRS is different from the transmission target address of the SL-PRS associated with the running timer T-PRS;

[0031] The PRS priority of the newly indicated SL-PRS is different from the PRS priority of the currently triggered SL-PRS;

[0032] The PRS priority of the newly indicated SL-PRS is different from the PRS priority of the SL-PRS associated with the running timer T-PRS.

[0033] In the above method performed by the user equipment, preferably,

[0034] When the MAC layer of the UE obtains or there are one or more SL resources for transmission, if the SL resource is a sidelink shared channel SL-SCH resource and the SL-SCH resource can accommodate the control element SL-PRS MAC CE, then the MAC layer of the UE instructs the multiplexing and combining process to generate an SL-PRS MAC CE.

[0035] In the above method performed by the user equipment, preferably,

[0036] When the UE determines the resources for transmitting a certain address, if this address contains both SL-PRS MAC CE and data from logical channels, then when forming a protocol data unit MAC PDU packet, the SL-PRS MAC CE always has a higher priority than the data from the logical channel group.

[0037] In the above method performed by the user equipment, preferably,

[0038] After the UE determines the resources for transmitting a certain address, if this address contains both SL-PRS MAC CE and data from the logical channel, then when forming a MAC PDU packet, the priority value of the SL-PRS MAC CE is directly compared with the priority value corresponding to the logical channel.

[0039] According to another aspect of the present invention, there is provided a user equipment, including:

[0040] processor; and

[0041] Memory, which stores instructions,

[0042] The above instructions, when executed by the above processor, execute the method described above.

[0043] According to the method performed by the user equipment and the corresponding user equipment involved in the present invention, a reference signal SL-PRS for positioning and ranging can be reliably sent. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The above and other features of the present disclosure will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0045] FIG1 is a flowchart illustrating a method executed by a user equipment UE according to an embodiment of the present invention.

[0046] FIG2 is a block diagram illustrating a user equipment according to an embodiment of the present disclosure.

[0047] It should be noted that the drawings are not necessarily drawn to scale, emphasis instead being placed on illustrating the principles of the technology disclosed herein. In addition, for clarity, like reference numerals throughout the drawings refer to like elements. DETAILED DESCRIPTION

[0048] The present disclosure is described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the present disclosure is not limited to the specific embodiments described below. In addition, for the sake of simplicity, detailed descriptions of known technologies that are not directly related to the present disclosure are omitted to prevent confusion in understanding the present disclosure.

[0049] Before the detailed description, some terms mentioned in this disclosure are explained as follows. Unless otherwise specified, the terms involved in this disclosure have the following meanings.

[0050] UE User Equipment

[0051] RLF Radio Link Failure

[0052] NR New Radio Next Generation Wireless Technology

[0053] LTE Long Term Evolution

[0054] Elte Enhaced Long Term Evolution

[0055] RRC Radio Resource Control

[0056] PDCP Packet Data Convergence Protocol1 Packet Data Convergence Protocol (layer)

[0057] RLC Radio Link Control Radio Link Control (layer)

[0058] MAC Medium Access Control (layer)

[0059] PHY physical layer

[0060] MAC CE Medium Access Control Control Element Media Access Control Layer Control Element

[0061] PDU Protocol Data Unit

[0062] Sidelink

[0063] V2X Vehicle to Everything (V2X)

[0064] PSSCH Physical Sidelink Shared Channel Physical side link shared channel

[0065] PSFCH Physical Sidelink Feedback Channel

[0066] PSCCH Physical Sidelink Control Channel

[0067] HARQ Hybrid Automatic Repeat Request Hybrid Automatic Repeat Request

[0068] SL-PRS Sidelink Positioning Reference Signal Sidelink Positioning Reference Signal

[0069] SCI Sidelink Control Information Sidelink control information

[0070] SL-SCH Sidelink Shared Channel Sidelink Shared Channel

[0071] SCCH Sidelink Control Channel Sidelink Control Channel

[0072] STCH Sidelink Traffic Channel

[0073] Sidelink Control Information (SCI)

[0074] The SCI is generally used to indicate the transmission of the SL-SCH and whether HARQ feedback is enabled.

[0075] An SCI consists of the first-stage SCI and the second-stage SCI. The first-stage SCI is transmitted on the PSCCH, while the second-stage SCI is transmitted on the PSSCH. The transport blocks indicated in the SCI are also transmitted on the PSSCH.

[0076] The MAC entity monitors the PSCCH channel (monitor PSCCH) at the PSCCH durations.

[0077] If the first-level SCI is received on the PSCCH channel, the UE can determine the reception timing of the second-level SCI and the transmission block (TB) based on the content of the first-level SCI. When the second-level SCI is received, the UE can obtain or store the valid SCI.

[0078] The SCI may carry indication information for indicating the transmission of the SL-PRS.

[0079] SL Grant

[0080] The SL grant can be automatically selected and generated / created by the UE's MAC entity. The SL grant is used to determine the transmission timing of the PSCCH and the transmission timing of the PSSCH, where the PSCCH is used to transmit the SCI and the PSSCH is used to transmit the SL-SCH information. When the MAC determines to create an SL grant, the MAC first selects the resource, that is, on which resource to determine the SL grant. Then, the transmission opportunities are further determined on the selected resources, and the opportunities are considered as the SL grant, thereby completing the creation of the SL grant.

[0081] The TX UE and RX UE are connected via the PC5 (ProSe protocol 5) interface. The PC5 interface is the interface for control plane and user plane sidelink communication between UEs. For sidelink unicast, the PC5-RRC connection is an access stratum (AS layer) logical connection between a pair of source layer 2 IDs and a target layer 2 ID. The establishment of a PC5 unicast link corresponds to the establishment of a PC5-RRC connection. PC5-RRC messages are messages transmitted over the PC5-RRC connection and are primarily generated and processed by the UE's PC5 RRC layer. PC5 RRC reconfiguration messages are PC5 RRC messages. The PC5-S connection is a non-access stratum (NAS) layer logical connection between a pair of source layer 2 IDs and a target layer 2 ID, or can be considered a logical connection at the higher layer of sidelink communication. PC5-S messages (also called PC5-S signaling) are messages or signaling transmitted over the PC5 non-access stratum and are primarily generated or processed by the non-access stratum of the PC5 interface.

[0082] In this article, a PC5 unicast link or a PC5-S connection may be referred to as a PC5 connection. Such a connection corresponds to a pair of source layer 2 ID and target layer 2 ID, which may be referred to as the destination information corresponding to the connection.

[0083] In this article, the terms associated, corresponding, and relevant can be used interchangeably.

[0084] In this article, sidelink and V2X sidelink can be used interchangeably.

[0085] In this article, sidelink and PC5 are used interchangeably.

[0086] In this article, the prefix "SL-" emphasizes that the discussion here focuses on side links. If similar problems exist on other links, the methods mentioned in this article can also be used to solve them.

[0087] The UEs at both ends of the SL link can be divided into transmitting UEs (TX UEs) and receiving UEs (RX UEs) based on their transmission and reception functions. From the perspective of one UE, the other UE is the peer UE (peer UE). In this article, the UE primarily refers to the RX UE, while the peer UE is the TX UE. The TX UE transmits the SCI and various reference signals, including the SL-PRS. The RX UE receives the SCI from the TX UE and detects the reference signals.

[0088] Unless otherwise specified, the UE in the following text generally refers to the TX UE.

[0089] Example 1

[0090] This embodiment provides a method executed by a UE, as shown in FIG1 , including:

[0091] Step 1 (S101 in Figure 1): The UE receives an indication from an upper layer instructing it to transmit an SL-PRS. Upon receiving this indication, the UE triggers an SL-PRS transmission. The upper layer here primarily refers to the UE's MAC layer (sometimes referred to as the MAC entity), which can be the RRC layer or an application layer related to positioning, but this is not a limitation here.

[0092] Step 2 (S102 shown in FIG1 ): When the UE has a triggered and not cancelled SL-PRS transmission:

[0093] When the MAC entity of the UE obtains or has one or more SL resources for transmission, the SL resource here mainly refers to the SL-SCH resource, and preferably, this or these SL-SCH resources can accommodate the SL-PRS MAC CE, specifically referring to the size of the SL-SCH resource can accommodate the data packet carrying the SL-PRS MAC CE for transmission, then the MAC entity of the UE instructs the multiplexing and assembly procedure to generate a SL-PRS MAC CE (instruct the Multiplexing and Assembly procedure to generate a SL-PRS MAC CE), and optionally, cancels the triggered SL-PRS transmission, and instructs the physical layer to send the SL-PRS on the SL resource;

[0094] Optionally, when the MAC entity of the UE obtains or has one or more SL resources for transmission, and the resource is a dedicated resource for SL-PRS transmission, the MAC entity of the UE may cancel the triggered SL-PRS transmission and instruct the physical layer to send the SL-PRS on the SL resource;

[0095] When the UE does not have any of the aforementioned SL resources, the UE may determine whether it is configured with sidelink resource allocation mode 1:

[0096] - If the UE is configured with Sidelink resource allocation mode 1, the UE can trigger a Scheduling Request;

[0097] If the UE is not configured with Sidelink resource allocation mode 1, the UE may also trigger the selection or reselection of transmit resources, or the selection or reselection of resource pools, for example, selecting a dedicated resource pool for positioning reference signal transmission and performing transmit resource selection or reselection therein.

[0098] Example 2

[0099] Based on Example 1, in step 1, the SL-PRS indicated by the upper layer of the UE may be the SL-PRS that the UE needs to send periodically. The specific indication method may be that the upper layer of the UE also indicates the transmission period of the SL-PRS when indicating the SL-PRS transmission.

[0100] For such SL-PRS that requires periodic transmission, optionally, in step 2, when the triggered SL-PRS transmission is canceled, the UE may start a timer T-PRS associated with the SL-PRS transmission. The timer's running duration may be equal to the SL-PRS transmission period. When the T-PRS runs out, the UE's MAC entity regenerates or triggers another SL-PRS transmission. Then, based on the triggered SL-PRS, the operation in step 2 is performed.

[0101] Example 3

[0102] Based on Examples 1 and 2,

[0103] In one case, when the upper layer of the UE instructs to stop or cancel the transmission of the SL-PRS, if the T-PRS associated with it is running, the UE can stop the running T-PRS; if the UE has triggered SL-PRS transmission, the UE can cancel the triggered SL-PRS transmission.

[0104] In one case, when the upper layer of the UE indicates the transmission of a new SL-PRS, if there is a running timer T-PRS, the UE can stop the running T-PRS; if the UE has a triggered SL-PRS transmission, the UE can cancel the triggered SL-PRS transmission.

[0105] The UE can determine whether it is a "new SL-PRS" transmission through the following scheme:

[0106] The transmission target address of the newly indicated SL-PRS is different from the transmission target address of the currently triggered SL-PRS;

[0107] The transmission target address of the newly indicated SL-PRS is different from the transmission target address of the SL-PRS associated with the running timer T-PRS;

[0108] The PRS priority of the newly indicated SL-PRS is different from the PRS priority of the currently triggered SL-PRS. Preferably, the PRS priority of the newly indicated SL-PRS is higher than the PRS priority of the currently triggered SL-PRS. Specifically, the value of the PRS priority of the newly indicated SL-PRS is smaller than the value of the PRS priority of the currently triggered SL-PRS.

[0109] The PRS priority of the newly indicated SL-PRS is different from the PRS priority of the SL-PRS associated with the running timer T-PRS. Preferably, the PRS priority of the newly indicated SL-PRS is higher than the PRS priority of the SL-PRS associated with the running timer T-PRS. Specifically, the value of the PRS priority of the newly indicated SL-PRS is less than the value of the PRS priority of the SL-PRS associated with the currently running timer T-PRS.

[0110] Example 4

[0111] In the aforementioned embodiment, when the UE needs to transmit both an SL-PRS MAC CE and SL data, there is still a problem: how to determine the order in which to generate a MAC PDU. Here is a possible method: After the UE determines the resources for transmitting a certain address, if this address requires both an SL-PRS MAC CE and data from a logical channel, then when assembling a MAC PDU, the SL-PRS MAC CE always takes precedence over the data from the logical channel group.

[0112] For example, on this resource, the UE first reserves space for the SL-PRS MAC CE, or first fills the transmission resource with the content / bit stream of the SL-PRS MAC CE, and then obtains data in descending order according to the priority of the logical channel or logical channel group, and performs packet filling until all resource space is used up.

[0113] Prioritize, here the data from the logical channel or logical channel group mainly refers to the data from STCH. If there is also data from SCCH, it can be packaged according to the following priorities from high to low:

[0114] -Data from SCCH

[0115] -SL-PRS MAC CE

[0116] -Data from STCH

[0117] Taking into account that SL-PRS has its corresponding SL PRS priority, another possible implementation method may be to set the priority value of the generated SL-PRS MAC CE to be equal to the priority value of the SL-PRS that triggers the generation of the SL-PRS MAC CE, or to a value corresponding to the SL-PRS priority.

[0118] For example, the upper layer may also indicate the priority of the SL-PRS while indicating the SL-PRS transmission, assuming that its value is 1. Then, after triggering the SL-PRS transmission, the priority value of the generated SL-PRS MAC CE may be set to 1.

[0119] After the UE determines the resources for transmitting a certain address, if this address has both SL-PRS MAC CE and data from the logical channel to be transmitted, then when forming a MAC PDU packet, the priority value of the SL-PRS MAC CE can be directly compared with the priority value corresponding to the logical channel.

[0120] For example, if there is a logical channel with a configured priority value of 0, then this value is less than the value of the SL-PRS MAC CE (which is '1'). Assuming that a smaller value has a higher priority, the priority of the logical channel is higher than that of the SL-PRS MAC CE. Therefore, when assembling the packet, the data of the logical channel is first considered, and then the data of the SL-PRS MAC CE is filled if there is remaining space.

[0121] For another example, there is a logical channel with a configured priority value of 2. This value is greater than the value of the SL-PRS MAC CE (which is '1'). Here, it is assumed that a smaller value has a higher priority, so the priority of this logical channel is lower than that of the SL-PRS MAC CE. Therefore, when assembling the packet, the data of the SL-PRS MAC CE is first considered to be filled, and then the data of the logical channel is filled if there is remaining space.

[0122] There is also a situation where the priority value of SL PRS cannot be directly assigned to its corresponding SL-PRS MAC CE. In this case, it can be mapped through a table lookup. For example, as shown in the following table, when the SL PRS value is 1, the corresponding SL-PRS MAC CE value is 0; when the SL PRS value is 3 or 4, the corresponding SL-PRS MAC CE value can all be 2, and so on.

[0123] Table 1 Priority mapping table

[0124] After determining the priority value of the SL-PRS MAC CE according to the above method, the UE can directly compare the priority value of the SL-PRS MAC CE with the priority value corresponding to the logical channel when composing a MAC PDU packet.

[0125] This embodiment can also be implemented independently to determine the priority of grouping packages.

[0126] Example 5

[0127] When a UE performs a SL transmission, it first selects a target address for the transmission. Among the addresses that meet the following conditions:

[0128] There is SL data transmission, and the one or more logical channels to which these data belong correspond to the logical channel priority;

[0129] There is SL-PRS transmission, and this SL-PRS has a corresponding SL-PRS priority.

[0130] The UE selects the address with the highest priority among the addresses that meet the above conditions. The UE may compare the priorities of multiple logical channels and select the logical channel with the highest priority; then compare the priorities of multiple SL-PRSs and select the SL-PRS with the highest priority; then compare the priority of the logical channel with the priority of the SL-PRS, assuming that the smaller the priority value, the higher the priority. If the priority value of the SL-PRS is smaller, it indicates that the priority of the SL-PRS is higher. Finally, the UE selects the target address to which the SL-PRS belongs as the target address for transmission; conversely, if the priority value of the SL-PRS is larger, it indicates that the priority of the SL-PRS is lower. Finally, the UE selects the target address to which the logical channel belongs as the target address for transmission. If the priority of the logical channel and the priority of the SL-PRS are the same value, the UE may always select the target address corresponding to the SL-PRS as the target address for transmission, or always select the target address to which the logical channel belongs as the target address for transmission.

[0131] The UE may also form a set of the priority values ​​of the logical channel and the priority values ​​of the SL-PRS, and select the priority with the smallest value. If the priority is the priority of the logical channel, then the target address to which the logical channel belongs is selected as the target address for transmission; if the priority is the priority of the SL-PRS, then the target address to which the SL-PRS belongs is selected as the target address for transmission.

[0132] When there are multiple priorities with the smallest values, for example, when the priority of the logical channel and the priority of the SL-PRS are the same and both are minimum values, the UE can always select the target address to which the SL-PRS belongs as the target address for transmission, or it can always select the target address to which the logical channel belongs as the target address for transmission.

[0133] Example 6

[0134] Based on the above embodiment, when the UE selects the target address to which the SL-PRS belongs as the target address for transmission, there is a case where the target address has no SL data to transmit, that is, no data from the logical channel and no MAC CE to transmit. In this case, the UE may not be able to generate the existing MAC PDU. To solve this problem, the following solution can be adopted:

[0135] Solution 1: When the selected target address has no SL data to be transmitted, the UE generates a new MAC subPDU, which can be named Empty sub MAC PDU, and only contains the MAC subheader.

[0136] Solution 2: When the selected target address has no SL data to be transmitted, the UE generates an EMPTY MAC CE, which can constitute an existing MAC PDU.

[0137] Example 7

[0138] Generally, after a UE is configured with discontinuous reception (DRX), if it receives SL transmission in the active state, it needs to start or restart the timer sl-drx-InactivityTimer.

[0139] Based on Examples 5 and 6, if the MAC PDU carried in the SL transmission received by an RX UE contains an Empty sub MAC PDU or an EMPTYMAC CE, then if the UE is configured with DRX, the UE may not need to start or restart the timer sl-drx-InactivityTimer.

[0140] Example 8

[0141] In the aforementioned embodiment, the UE receives an indication from an upper layer instructing the UE to transmit an SL-PRS. Alternatively, the UE receives an indication from another UE instructing the UE to transmit an SL-PRS. Such an indication may be carried in an SCI sent by the other UE and received by the UE, or in a MAC CE. Based on this indication, the UE transmits an SL-PRS, including triggering an SL-PRS transmission as described above, and transmitting the SL-PRS if resources are available.

[0142] Example 9

[0143] In the aforementioned embodiment, the SL-PRS MAC CE may be designed to have a fixed length, including 0 bits, and may be identified by setting the logical channel identifier in the MAC header to a specific value.

[0144] FIG2 is a block diagram illustrating a user equipment UE20 according to an embodiment of the present disclosure. As shown in FIG2 , the user equipment UE20 includes a processor 201 and a memory 202. The processor 201 may include, for example, a microprocessor, a microcontroller, an embedded processor, etc. The memory 202 may include, for example, a volatile memory (such as a random access memory RAM), a hard disk drive (HDD), a non-volatile memory (such as a flash memory), or other memory. The memory 202 stores program instructions. When the instructions are executed by the processor 201, the above-mentioned method performed by the user equipment (such as the method shown in FIG1 ) described in detail in the present disclosure may be executed.

[0145] The program running on the device according to the present disclosure may be a program that controls a central processing unit (CPU) to enable a computer to implement the functions of the embodiments of the present disclosure. The program or the information processed by the program may be temporarily stored in a volatile memory (such as a random access memory RAM), a hard disk drive (HDD), a non-volatile memory (such as a flash memory), or other memory systems.

[0146] The program for realizing each embodiment function of the present disclosure can be recorded on a computer-readable recording medium. The corresponding function can be realized by making a computer system read the program recorded on the recording medium and executing these programs. The so-called "computer system" herein can be a computer system embedded in the device, and can include an operating system or hardware (such as a peripheral device). "Computer-readable recording medium" can be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a short-term dynamic storage program recording medium or any other recording medium that is computer-readable.

[0147] The various features or functional modules of the devices used in the above embodiments can be implemented or executed by circuits (e.g., single-chip or multi-chip integrated circuits). The circuits designed to perform the functions described in this specification may include a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or any combination of the above devices. The general-purpose processor may be a microprocessor, or any existing processor, controller, microcontroller, or state machine. The above circuits may be digital circuits or analog circuits. In the case where new integrated circuit technologies have emerged to replace existing integrated circuits due to advances in semiconductor technology, one or more embodiments of the present disclosure may also be implemented using these new integrated circuit technologies.

[0148] Furthermore, the present disclosure is not limited to the above-described embodiments. Although various examples of the embodiments have been described, the present disclosure is not limited thereto. Fixed or non-mobile electronic devices installed indoors or outdoors can be used as UE devices or communication devices, such as AV equipment, kitchen equipment, cleaning equipment, air conditioners, office equipment, vending machines, and other household appliances.

[0149] As described above, the embodiments of the present disclosure have been described in detail with reference to the accompanying drawings. However, the specific structure is not limited to the above-mentioned embodiments, and the present disclosure also includes any design changes that do not deviate from the main purpose of the present disclosure. In addition, various modifications can be made to the present disclosure within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present disclosure. In addition, components with the same effect described in the above-mentioned embodiments can be replaced with each other.

Claims

1. A method performed by a user equipment, comprising the following steps: The user equipment UE receives an instruction from an upper layer, instructing the UE to send a side link positioning reference signal SL-PRS, wherein: The upper layer is above the UE's media access control MAC layer; In the case that there is a triggered and not cancelled SL-PRS transmission by the UE, When the MAC layer of the UE obtains or has one or more SL resources for transmission, and the resource is a dedicated resource for SL-PRS transmission, the MAC layer of the UE cancels the triggered SL-PRS transmission and instructs the physical layer to send SL-PRS on the SL resource; When the UE does not have the above-mentioned SL resources, the UE determines whether the side link resource allocation mode 1 is configured.

2. The method according to claim 1, wherein: If the UE is configured with sidelink resource allocation mode 1, the UE triggers a scheduling request; If the UE is not configured with sidelink resource allocation mode 1, the UE triggers selection and reselection of a resource pool.

3. The method according to claim 1 or 2, wherein: The SL-PRS indicated by the upper layer of the UE is a periodically transmitted SL-PRS. When the triggered SL-PRS transmission is canceled, the UE starts a timer T-PRS associated with the SL-PRS transmission, wherein the running duration of the timer T-PRS is equal to the transmission period of the SL-PRS.

4. The method according to claim 3, wherein: When the upper layer of the UE instructs to stop or cancel the transmission of the SL-PRS, If the timer T-PRS associated with it is running, the UE stops the running timer T-PRS; If the UE has triggered SL-PRS transmission, the UE cancels the triggered SL-PRS transmission.

5. The method performed by the user equipment according to claim 3, wherein: When the upper layer of the UE indicates the transmission of a new SL-PRS, If there is a running timer T-PRS, the UE stops the running timer T-PRS; If the UE has triggered SL-PRS transmission, the UE cancels the triggered SL-PRS transmission.

6. The method performed by the user equipment according to claim 5, wherein: When at least one of the following conditions is met, it is determined to be a new SL-PRS transmission: The transmission target address of the newly indicated SL-PRS is different from the transmission target address of the currently triggered SL-PRS; The transmission target address of the newly indicated SL-PRS is different from the transmission target address of the SL-PRS associated with the running timer T-PRS; The PRS priority of the newly indicated SL-PRS is different from the PRS priority of the currently triggered SL-PRS; The PRS priority of the newly indicated SL-PRS is different from the PRS priority of the SL-PRS associated with the running timer T-PRS.

7. The method performed by a user equipment according to claim 1 or 2, wherein: When the MAC layer of the UE obtains or there are one or more SL resources for transmission, if the SL resource is a sidelink shared channel SL-SCH resource and the SL-SCH resource can accommodate the control element SL-PRS MAC CE, then the MAC layer of the UE instructs the multiplexing and combining process to generate a SL-PRS MAC CE.

8. The method performed by the user equipment according to claim 7, wherein: After the UE determines the resources for transmitting a certain address, if this address has both SL-PRS MAC CE and data from the logical channel to be transmitted, then when forming a protocol data unit MAC PDU packet, the priority of SL-PRS MAC CE is always higher than the data from the logical channel group.

9. The method performed by the user equipment according to claim 7, wherein: After the UE determines the resources for transmitting a certain address, if this address has both SL-PRS MAC CE and data from the logical channel to be transmitted, then when forming a MAC PDU packet, the priority value of the SL-PRS MAC CE is directly compared with the priority value corresponding to the logical channel.

10. A user equipment, comprising: processor; as well as A memory, wherein instructions are stored in the memory; When the instructions are executed by the processor, the user equipment is caused to execute the method according to any one of claims 1-9.

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