Method executed by user equipment and user equipment

Abstract

The invention provides a method executed by user equipment and the user equipment. The method executed by the user equipment comprises the following steps that: the UE receives an instruction for transmitting a sidelink positioning reference signal (SL-PRS); when the SL-PRS indicated to be transmitted is a non-periodic SL-PRS, the UE triggers an SL-PRS resource request; the UE cancels the triggered SL-PRS resource request under any one of the following conditions: the SL-PRS resource request MAC CE is carried in the MAC PDU, and the MAC PDU is sent; sL authorization for transmission is obtained or exists, and the SL authorization can accommodate all the to-be-transmitted and aperiodic SL-PRSs which can be obtained. Therefore, the network side can be prevented from repeatedly allocating resources to the UE, so that the resources can be properly allocated in the network, and the utilization efficiency of the resources is improved.

Description

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 a corresponding user equipment. Background Art

[0002] Vehicle to Everything (V2X) is a new generation of information and communication technology that connects vehicles to everything, where V stands for vehicle and X stands for any object that interacts with the vehicle. Currently, X mainly includes vehicles, people, roadside infrastructure and networks.

[0003] In a pair of UEs performing V2X service communication, the UEs communicate via a side link (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 the UE, the position (e.g., absolute position; or relative position) and / or direction of the UE may be calculated or estimated based on the measurement of the reference signal used for positioning and ranging.

[0005] The UE can send a reference signal for positioning and ranging on the side link. Such a reference signal is called SL-PRS. When the UE needs to send SL-PRS, if there are no available SL transmission resources, the UE will request resources from the network side or the base station side for the transmission of SL-PRS. After receiving the request, the network side or the base station side can schedule SLgrant for the UE for the transmission of SL-PRS. During the process of making an SL-PRS resource request, if the UE obtains available SL-PRS resources, then in order to avoid the network side from repeatedly allocating resources to the UE, how to cancel the ongoing SL-PRS resource request is a problem that needs to be solved. Summary of the invention

[0006] The present disclosure proposes a method executed by a user equipment and a corresponding user equipment, which can cancel the ongoing SL-PRS resource request when the UE obtains available SL-PRS resources during the SL-PRS resource request process, thereby avoiding the network side from repeatedly allocating resources to the UE, thereby enabling appropriate resource allocation in the network and improving resource utilization efficiency.

[0007] According to one aspect of the present disclosure, a method performed by a user equipment is provided, including: a UE receives an indication to transmit a sidelink positioning reference signal SL-PRS; the UE triggers a SL-PRS resource request when the SL-PRS indicated to be transmitted is a non-periodic SL-PRS; the UE cancels the triggered SL-PRS resource request in any of the following cases: the SL-PRS resource request MACCE is carried in a MAC PDU and the MAC PDU is sent; a SL authorization for transmission is obtained or exists, and the SL authorization can accommodate all available SL-PRS to be transmitted and non-periodic.

[0008] In the above method, the UE may also instruct the multiplexing and combining entity to generate the SL-PRS resource request MAC CE when acquiring or having uplink resources of the Uu interface for transmission.

[0009] In the above method, the UE may also trigger a scheduling request for the triggered SL-PRS resource request when there are no uplink resources of the Uu interface for transmission.

[0010] In the above method, when the SL-PRS instructed to be transmitted is a periodic SL-PRS, the UE may notify the RRC layer to send a SL-PRS resource request or send an RRC message carrying SL-PRS resource request information.

[0011] In the above method, it may also be that when there is a triggered and uncancelled scheduling request, the UE sends the scheduling request on the PUCCH resource if the scheduling request has a valid PUCCH resource, and starts a random access process if the scheduling request does not have a valid PUCCH resource.

[0012] In the above method, the UE may also cancel the scheduling request triggered by the triggered SL-PRS resource request when the uplink resources of the Uu interface for transmission are obtained or exist.

[0013] In the above method, the UE may also stop the random access process in any of the following situations: obtaining or having a SL authorization for transmission, and the SL authorization can accommodate all available non-periodic SL-PRS to be transmitted; sending a MAC PDU carrying a SL-PRS resource request MAC CE, and the UL authorization used to transmit the MAC PDU is not the UL authorization provided by the UE in the random access response.

[0014] In the above method, the UE may also start the timer after sending the SL-PRS resource request MAC CE or the MAC PDU carrying the SL-PRS resource request MAC CE.

[0015] In the above method, it may also be that when the timer expires, the UE determines whether there is still non-periodic SL-PRS that needs to be sent on the UE side, and triggers an SL-PRS resource request if there is still non-periodic SL-PRS that needs to be sent on the UE side.

[0016] In addition, according to the present invention, a user equipment is provided, comprising: a processor; and a memory storing instructions, wherein the instructions, when executed by the processor, enable the user equipment to execute the method.

[0017] Effects of the Invention

[0018] According to the present disclosure, when the UE obtains available SL-PRS resources during the SL-PRS resource request process, the ongoing SL-PRS resource request can be canceled, thereby avoiding the network side from repeatedly allocating resources to the UE, thereby enabling appropriate resource allocation in the network and improving resource utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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:

[0020] Figure 1 It is a flowchart showing a method executed by a user equipment UE involved in an embodiment of the present disclosure.

[0021] Figure 2 is a block diagram showing a user equipment according to an embodiment of the present disclosure.

[0022] 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

[0023] The present disclosure is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the present disclosure should not be 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 the understanding of the present disclosure.

[0024] Before the detailed description, some terms mentioned in the present disclosure are explained as follows. Unless otherwise specified, the terms involved in the present disclosure have the following meanings.

[0025] UE User Equipment

[0026] RLF Radio Link Failure Radio link failure

[0027] NR New Radio Next Generation Wireless Technology

[0028] LTE Long Term Evolution

[0029] Elte Enhaced Long Term Evolution Enhanced Long Term Evolution Technology

[0030] RRC Radio Resource Control

[0031] PDCP Packet Data Convergence Protocol Packet Data Convergence Protocol (layer)

[0032] RLC Radio Link Control Radio Link Control (layer)

[0033] MAC Medium Access Control Media Access Control (layer)

[0034] PHY physical layer

[0035] MAC CE Medium Access Control Control Element Media Access Control Layer Control Element

[0036] PDU Protocol Data Unit Protocol Data Unit

[0037] Sidelink

[0038] V2X Vehicle to Everything

[0039] PSSCH Physical Sidelink Shared Channel Physical Sidelink Shared Channel

[0040] PSFCH Physical Sidelink Feedback Channel Physical Sidelink Feedback Channel

[0041] PSCCH Physical Sidelink Control Channel Physical Sidelink Control Channel

[0042] HARQ Hybrid Automatic Repeat Request Hybrid Automatic Repeat Request

[0043] SL-PRS Sidelink Positioning Reference Signal Sidelink Positioning Reference Signal

[0044] SCI Sidelink Control Information Sidelink Control Information

[0045] SL-SCH Sidelink Shared Channel Sidelink Shared Channel

[0046] SCCH Sidelink Control Channel Sidelink Control Channel

[0047] STCH Sidelink Traffic Channel Sidelink Traffic Channel

[0048] Sidelink Control Information SCI

[0049] SCI is usually used to indicate the transmission of SL-SCH and whether HARQ feedback is enabled.

[0050] An SCI includes the first stage SCI and the second stage SCI. The first stage SCI is transmitted on the PSCCH channel, and the second stage SCI is transmitted on the PSSCH channel. The transport blocks indicated in the SCI are also transmitted on the PSSCH channel.

[0051] The MAC entity monitors the PSCCH channel (monitorPSCCH) at the occurrence time of the PSCCH channel (PSCCH durations).

[0052] 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 reception timing of the transport block (TB) according to the content of the first level SCI. When the second level SCi is received, the UE can obtain or store the valid SCI.

[0053] The SCI may carry indication information for indicating the transmission of the SL-PRS.

[0054] SL Grant

[0055] 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 resources, that is, on which resources 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.

[0056] The TX UE and the RX UE are connected via the PC5 (ProSe protocol 5) interface. The PC5 interface is an interface for control plane and user plane sidelink communication between UE and UE. For sidelink unicast, the PC5-RRC connection is an access layer (AS layer) logical connection between a pair of source layer 2 IDs and target layer 2 IDs. The establishment of a PC5 unicast link will correspond to the establishment of a PC5-RRC connection. The PC5-RRC message refers to the message transmitted on the PC5-RRC connection, which is mainly generated and processed by the PC5 RRC layer of the UE. The PC5 RRC reconfiguration message is the PC5 RRC message. The PC5-S connection is a non-access layer (NAS) layer logical connection between a pair of source layer 2 IDs and target layer 2 IDs, or it can be considered as a logical connection of the sidelink communication high layer. The PC5-S message (also called PC5-S signaling, PC5-S signaling) refers to the message or signaling transmitted on the PC5 non-access layer, which is mainly generated or processed by the non-access layer of the PC5 interface.

[0057] 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.

[0058] In this article, the terms associated, corresponding, and relevant can be used interchangeably.

[0059] In this article, sidelink and V2X sidelink can be used interchangeably.

[0060] In this article, sidelink and PC5 are used interchangeably.

[0061] In this article, "SL-" is used as a prefix to emphasize that the discussion scenario in this article is mainly side links. If similar problems exist on other links, they can also be solved using the methods mentioned in this article.

[0062] The UEs at both ends of the SL link can be divided into transmitting UE (TX UE) and receiving UE (RXUE) according to the classification of sending and receiving. From the perspective of one UE, the other UE is the peer UE. The UE in this article mainly refers to the RXUE, and the other peer UE is the TX UE. The TX UE sends SCI and various reference signals, including SL-PRS, etc. The RX UE receives the SCI from the TX UE and detects the reference signal.

[0063] Unless otherwise specified, UE in the following text generally refers to TX UE.

[0064] In an embodiment of the present invention, a method performed by a user equipment UE is provided, including: receiving an indication to perform SL-PRS transmission; triggering a SL-PRS resource request when the SL-PRS indicated to be transmitted is a non-periodic SL-PRS; and canceling the triggered SL-PRS resource request when a SL-PRS resource request MAC CE is carried in a MAC PDU and the MAC PDU is sent, or when a SL authorization for transmission is obtained or exists and the SL authorization can accommodate all available SL-PRS to be transmitted and non-periodic.

[0065] According to the above method, when the UE obtains available SL-PRS resources during the SL-PRS resource request process, the ongoing SL-PRS resource request can be canceled, thereby avoiding the network side from repeatedly allocating resources to the UE, thereby enabling appropriate resource allocation in the network and improving resource utilization efficiency.

[0066] Example 1

[0067] This embodiment provides a method executed by a UE. Figure 1 is a flowchart showing a method executed by a user equipment UE according to an embodiment of the present disclosure. Figure 1 As shown, the method includes:

[0068] Step 1 Figure 1S101 shown): The UE is triggered or instructed to perform SL-PRS transmission. Such a trigger or indication may come from an upper layer of the UE, where the upper layer mainly refers to the MAC layer (sometimes also referred to as MAC entity) of the UE, which may be the RRC layer, or an application layer associated with positioning (Positionging), which is not limited here. Such a trigger or indication may also come from a lower layer of the opposite UE, such as the physical layer below the MAC layer, that is, the UE receives a lower layer signaling or signal from the opposite UE, instructing the UE to perform SL-PRS transmission. Both methods can trigger the UE to perform SL-PRS transmission.

[0069] Step 2 ( Figure 1 S102 shown): When the SL-PRS transmission of the UE is triggered, the following processing may be performed:

[0070] Case 1: The SL-PRS that is triggered for transmission is an aperiodic SL-PRS (aperiodic SL-PRS), so the UE can trigger a SL-PRS resource request (SL-PRS resource request); the triggered SL-PRS resource request is to request resources from the base station or the network side for SL-PRS transmission, which is specifically manifested as sending a SL-PRS resource reqeust MAC CE to the base station or the network side. Therefore, this triggered SL-PRS resource request can also be called a triggered SL-PRS MAC CE, or the UE triggers a SL-PRS resource reqeust MAC CE in the case, but it needs to be distinguished from the subsequent real transmission SL-PRS MAC CE. Here, only such a SL-PRS MAC CE is triggered, and no transmission is performed;

[0071] Case 2: The SL-PRS that is triggered to be transmitted is a periodic SL-PRS (periodicSL-PRS), then the UE can notify the RRC layer to send a SL-PRS resource request, or send an RRC message carrying the SL-PRS resource request information.

[0072] In case 1, when there is a triggered and not cancelled SL-PRS resource request in the UE:

[0073] When the MAC entity of the UE obtains or has one or more uplink resources of the Uu interface for transmission, the uplink resource here mainly refers to the UL-SCH resource, and preferably, this or these UL-SCH resources can accommodate the SL-PRS resource request MAC CE, and can also accommodate the subheader of this MAC CE, then the MAC entity of the UE can instruct the multiplexing and combining entity to generate a SL-PRS resource request MAC CE;

[0074] If the above UL-SCH does not exist, the UE may trigger a Scheduling Request (SR) for the triggered SL-PRS resource request. When an SR is triggered and not canceled, the SR may be considered a pending SR.

[0075] Step 3 Figure 1 S103 shown): The triggered SL-PRS resource request may be cancelled in the following cases:

[0076] When a SL-PRS resource request MAC CE is carried in a MAC PDU and this MAC PDU is sent, the UE can cancel the triggered SL-PRS resource request;

[0077] When the UE's MAC entity obtains or has one or more SL grant(s) for transmission, and this or these SL grant(s) can accommodate all available SL-PRS to be transmitted and are aperiodic, the UE can cancel the triggered SL-PRS resource request;

[0078] Taking into account that the SL-PRS on the UE side can be periodic or non-periodic, all non-periodic SL-PRS to be transmitted are considered in the above judgment. This is because the resource request for the periodic SL-PRS is sent by the RRC layer, and the SL-PRS resource request triggered by the MAC layer is actually a request for resources for the transmission of the non-periodic SL-PRS. Therefore, when judging whether the triggered SL-PRS resource request can be canceled, the request can be canceled only when all non-periodic SL-PRS can be accommodated by SLgrant(s).

[0079] Example 2

[0080] Based on Example 1, when the UE has a pending SR, if the SR is configured with valid PUCCH resources, the UE can send an SR request on its corresponding PUCCH resources; if the SR is not configured with valid PUCCH resources, or the MAC entity does not have valid PUCCH resources for the SR, the UE can initiate a random access process.

[0081] An SR triggered by a triggered SL-PRS resource request can be canceled in the following cases:

[0082] When the MAC entity of the UE obtains or there are one or more uplink resources of the Uu interface for transmission, the uplink resources here mainly refer to the UL-SCH resource, and preferably, this or these UL-SCH resources can accommodate the SL-PRS resource request MAC CE, and can also accommodate the sub-header of this MAC CE.

[0083] The SR triggered by the triggered SL-PRS resource request can enable the UE to start the random access procedure without valid PUCCH resources. The UE can stop the random access procedure in the following cases:

[0084] -When the UE's MAC entity obtains or has one or more SL grant(s) for transmission, and this or these SL grant(s) can accommodate all available SL-PRS to be transmitted and are aperiodic, the UE can cancel the triggered SL-PRS resource request.

[0085] - When the UE sends a MAC PDU carrying the SL-PRS resource request MAC CE and the UL grant used to transmit this MAC PDU is not the UL grant provided by the UE in the random access response.

[0086] Example 3

[0087] Based on the foregoing embodiment, the UE may start a timer after sending the SL-PRS resource request MAC CE or sending the MAC PDU carrying the SL-PRS resource request MAC CE.

[0088] When this timer expires, the UE determines whether there is any aperiodic SL-PRS to be sent on the UE side, also known as pending aperiodic SL-PRS:

[0089] In one case, when this timer expires, there are still pending, non-periodic SL-PRS on the UE side, then the UE can trigger an SL-PRS resource request and operate as described in Example 1.

[0090] In one case, when this timer expires, there is no pending, non-periodic SL-PRS on the UE side, then the UE does not need to trigger a SL-PRS resource request.

[0091] In one case, when this timer expires, there is a periodic SL-PRS that needs to be transmitted on the UE side, then the UE can notify the RRC layer to send an SL-PRS resource request and perform operations as described in Example 1.

[0092] If SL-PRS is sent while this timer is running, the UE may restart the timer.

[0093] Figure 2 1 is a block diagram showing a user equipment UE20 according to an embodiment of the present disclosure. Figure 2 As shown, 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, etc. The memory 202 stores program instructions. When the instructions are executed by the processor 201, the above-mentioned method (such as the method of executing ... Figure 1 ).

[0094] The program running on the device according to the present disclosure may be a program that enables a computer to implement the functions of the embodiments of the present disclosure by controlling a central processing unit (CPU). The program or 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.

[0095] The program for realizing the functions of each embodiment of the present disclosure can be recorded on a computer-readable recording medium. The corresponding functions 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 recording medium of a short-term dynamic storage program, or any other recording medium readable by a computer.

[0096] The various features or functional modules of the devices used in the above embodiments can be implemented or executed by circuits (e.g., monolithic or multi-chip integrated circuits). Circuits designed to perform the functions described in this specification may include general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), 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.

[0097] In addition, the present disclosure is not limited to the above-mentioned 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.

[0098] As mentioned 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 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 changes can be made to the present disclosure within the scope of the claims, and the 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, the components with the same effect described in the above embodiments can be replaced by each other.

Claims

1. A method performed by a user equipment UE, comprising: The UE receives an indication of transmitting a side link positioning reference signal SL-PRS; The UE triggers a SL-PRS resource request when the SL-PRS instructed to be transmitted is an aperiodic SL-PRS; The UE cancels the triggered SL-PRS resource request in any of the following cases: The SL-PRS resource request MAC CE is carried in the MAC PDU, and the MAC PDU is sent; A SL grant for transmission is obtained or exists, and the SL grant can accommodate all available non-periodic SL-PRSs to be transmitted.

2. The method according to claim 1, wherein: When the UE obtains or has uplink resources of the Uu interface for transmission, it instructs the multiplexing and combining entity to generate an SL-PRS resource request MAC CE.

3. The method according to claim 1, wherein: The UE triggers a scheduling request for the triggered SL-PRS resource request in the absence of uplink resources on the Uu interface for transmission.

4. The method according to claim 1, wherein: When the SL-PRS instructed to be transmitted is a periodic SL-PRS, the UE notifies the RRC layer to send a SL-PRS resource request, or sends an RRC message carrying SL-PRS resource request information.

5. The method according to claim 3, wherein: When there is a triggered and uncancelled scheduling request, the UE sends the scheduling request on the PUCCH resource if the scheduling request has a valid PUCCH resource, and initiates a random access procedure if the scheduling request does not have a valid PUCCH resource.

6. The method according to claim 5, wherein: When the UE obtains or has uplink resources of the Uu interface for transmission, the UE cancels the scheduling request triggered by the triggered SL-PRS resource request.

7. The method according to claim 5, wherein: The UE stops the random access procedure in any of the following cases: A SL grant for transmission is obtained or exists, and the SL grant can accommodate all available non-periodic SL-PRSs to be transmitted; A MAC PDU carrying a SL-PRS resource request MAC CE is sent, and the UL grant used to transmit the MAC PDU is not the UL grant provided by the UE in the random access response.

8. The method according to claim 1, wherein: After sending the SL-PRS resource request MAC CE or the MAC PDU carrying the SL-PRS resource request MAC CE, the UE starts the timer.

9. The method according to claim 1, wherein: When the timer times out, the UE determines whether there is still a non-periodic SL-PRS that needs to be sent on the UE side, and triggers an SL-PRS resource request if there is still a non-periodic SL-PRS that needs to be sent on the UE side.

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

Images