Method, apparatus and computer program product for wireless communication

Abstract

A wireless communication method is disclosed. The method includes transmitting, by the first wireless communication terminal, a request for a sidelink (SL) location-related service to one of the second wireless communication terminals, where one of the second wireless communication terminals is selected based on status information of the second wireless communication terminals.

Description

Technical Field

[0001] This application relates generally to wireless communication, and particularly to fifth-generation (5G) or sixth-generation (6G) communication. Background Technology

[0002] Sidelink (SL) communication in 5G enables direct wireless communication between devices without relying on cellular networks. It supports self-organizing networks, allowing devices to exchange data with low latency and high reliability. Through features similar to beamforming and interference management, sidelink communication optimizes signal quality and is ideal for critical communications and proximity-based services. It enhances device-to-device (D2D) connectivity, Internet of Things (IoT) applications, and enables new use cases across industries. Sidelink communication extends communication capabilities beyond cellular networks, opening up new possibilities for device connectivity and interaction.

[0003] However, the process of ranging / SL positioning services remains a topic for discussion. Summary of the Invention

[0004] This document relates to methods, systems, and computer program products for wireless communication.

[0005] One aspect of this disclosure relates to a wireless communication method. In an embodiment, the wireless communication method includes: transmitting a request for a sidelink (SL) location-related service from a first wireless communication terminal to one of second wireless communication terminals, wherein the one of the second wireless communication terminals is selected from among the second wireless communication terminals based on state information of the second wireless communication terminals.

[0006] Various embodiments may preferably implement the following features:

[0007] Preferably, the status information includes at least one of the following:

[0008] Information regarding whether the corresponding second wireless communication terminal has a non-access stratum (NAS) connection.

[0009] Information regarding whether the corresponding second wireless communication terminal is served by the Radio Access Network (RAN).

[0010] Information regarding whether the corresponding second wireless communication terminal can act as an SL positioning server user equipment (UE) or authorization server, or

[0011] Information regarding whether the corresponding second wireless communication terminal can locate the SL positioning server UE or the authorized server.

[0012] Preferably, the method further includes at least one of the following:

[0013] One of the second wireless communication terminals is selected based on whether each second wireless communication terminal has a NAS connection;

[0014] In response to the fact that each second wireless communication terminal does not have a NAS connection, one of the second wireless communication terminals is selected based on whether the second wireless communication terminal is served by the RAN.

[0015] In response to each second wireless communication terminal not being served by the RAN, one of the second wireless communication terminals is selected based on whether it can act as an SL positioning server (UE) or an authorization server; or

[0016] In response to the fact that each second wireless communication terminal cannot act as an SL positioning server UE or an authorized server, one of the second wireless communication terminals is selected based on whether the second wireless communication terminal can find an SL positioning server UE or an authorized server.

[0017] Preferably, the method further includes:

[0018] In response to a portion of the second wireless communication terminal having a NAS connection, one of the second wireless communication terminals is selected from that portion of the second wireless communication terminal having a NAS connection.

[0019] Preferably, the method further includes:

[0020] In response to a portion of the second wireless communication terminal being served by the RAN, one of the second wireless communication terminals is selected from that portion of the second wireless communication terminal served by the RAN.

[0021] Preferably, the method further includes:

[0022] In response to a portion of the second wireless communication terminal being capable of acting as an SL positioning server UE or an authorization server, one of the second wireless communication terminals is selected from that portion of the second wireless communication terminal capable of acting as an SL positioning server UE or an authorization server.

[0023] Preferably, the method further includes:

[0024] In response to a portion of the second wireless communication terminal being able to locate the SL positioning server UE or the authorized server, one of the second wireless communication terminals is selected from that portion of the second wireless communication terminal capable of locating the SL positioning server UE or the authorized server.

[0025] Preferably, the method further includes:

[0026] In response to a request for status information transmitted from a first wireless communication terminal to a second wireless communication terminal, the first wireless communication terminal receives the status information from the second wireless communication terminal.

[0027] Preferably, the method further includes:

[0028] The first wireless communication terminal receives the status information of the second wireless communication terminal from the second wireless communication terminal via a message used in the discovery process for SL location-related services.

[0029] Preferably, the method further includes:

[0030] The first wireless communication terminal stores a list of second wireless communication terminals based on messages used in the discovery process for SL location-related services, wherein the list is used by the first wireless communication terminal to select one of the second wireless communication terminals to which it transmits a request for SL location-related services.

[0031] Preferably, the method further includes:

[0032] The first wireless communication terminal receives a discovery message from the second wireless communication terminal, which includes the status information of the second wireless communication terminal.

[0033] Preferably, the method further includes:

[0034] A discovery message is transmitted from the first wireless communication terminal to the second wireless communication terminal. The discovery message includes an indication in the discovery response message of the status information requested by the first wireless communication terminal.

[0035] Preferably, the discovery message also includes an indication of at least one of whether the discovery message is encrypted or the encryption key of the discovery message.

[0036] Preferably, the encryption key is also used to encrypt the discovery response message of the SL location-related service transmitted from the second wireless communication terminal to the first wireless communication terminal.

[0037] Another aspect of this disclosure relates to a wireless communication method. In an embodiment, the wireless communication method includes: a second wireless communication terminal receiving a request for a location-related service (SL) from a first wireless communication terminal, wherein the second wireless communication terminal selects the service based on its own state information.

[0038] Various embodiments may preferably implement the following features:

[0039] Preferably, the status information includes at least one of the following:

[0040] Information regarding whether the corresponding second wireless communication terminal has a non-access stratum (NAS) connection.

[0041] Information regarding whether the corresponding second wireless communication terminal is served by the Radio Access Network (RAN).

[0042] Information regarding whether the corresponding second wireless communication terminal can act as an SL positioning server user equipment (UE) or authorization server, or

[0043] Information regarding whether the corresponding second wireless communication terminal can locate the SL positioning server UE or the authorized server.

[0044] Preferably, the method further includes:

[0045] In response to a request for status information transmitted from the first wireless communication terminal to the second wireless communication terminal, the second wireless communication terminal transmits the status information to the first wireless communication terminal.

[0046] Preferably, the method further includes:

[0047] The second wireless communication terminal transmits its status information to the first wireless communication terminal via a message used in the discovery process for SL location-related services.

[0048] Preferably, the method further includes:

[0049] The second wireless communication terminal transmits a discovery message, including the status information of the second wireless communication terminal, to the first wireless communication terminal.

[0050] Preferably, the method further includes:

[0051] The second wireless communication terminal receives a discovery message from the first wireless communication terminal, the discovery message including an indication in a discovery response message of the status information requested by the first wireless communication terminal; and

[0052] The second wireless communication terminal transmits a discovery response message to the first wireless communication terminal. This message includes the status information indicated by the indication in the discovery message.

[0053] Preferably, the discovery message also includes an indication of at least one of whether the discovery message is encrypted or the encryption key of the discovery message.

[0054] Preferably, the encryption key is also used to encrypt the discovery response message of the SL location-related service transmitted from the second wireless communication terminal to the first wireless communication terminal.

[0055] Another aspect of this disclosure relates to a first wireless communication terminal. In an embodiment, the first wireless communication terminal includes a communication unit and a processor. The processor is configured to transmit a request for a sidelink (SL) location-related service to one of the second wireless communication terminals via the communication unit, wherein the one of the second wireless communication terminals is selected from among the second wireless communication terminals based on the status information of the second wireless communication terminals.

[0056] Another aspect of this disclosure relates to a second wireless communication terminal. In an embodiment, the second wireless communication terminal includes a communication unit and a processor. The processor is configured to receive a request for location-related services of a peer link (SL) from a first wireless communication terminal via the communication unit, wherein the second wireless communication terminal is selected based on the state information of the second wireless communication terminal.

[0057] This disclosure relates to a computer program product including computer-readable program medium code stored thereon, which, when executed by a processor, causes the processor to implement the wireless communication method according to any of the foregoing methods.

[0058] The exemplary embodiments disclosed herein are intended to provide features that will become apparent from the following description and in conjunction with the accompanying drawings. Exemplary systems, methods, apparatuses, and computer program products are disclosed herein according to various embodiments. However, it should be understood that these embodiments are presented by way of example and not limitation, and that various modifications can be made to the disclosed embodiments while remaining within the scope of this disclosure, as will be apparent to those skilled in the art who read this disclosure.

[0059] Therefore, this disclosure is not limited to the exemplary embodiments and applications described and illustrated herein. Furthermore, the specific order and / or hierarchy of steps in the methods disclosed herein are merely exemplary methods. Based on design preferences, the specific order or hierarchy of steps in the disclosed methods or processes may be rearranged while remaining within the scope of this disclosure. Therefore, those skilled in the art will understand that the methods and techniques disclosed herein present various steps or actions in a sample order, and unless otherwise expressly stated, this disclosure is not limited to the specific order or hierarchy presented.

[0060] The foregoing and other aspects and their embodiments are described in more detail in the accompanying drawings, description and claims. Attached Figure Description

[0061] Figure 1 A schematic diagram of a network according to an embodiment of the present disclosure is shown.

[0062] Figure 2 A schematic diagram of a process according to an embodiment of the present disclosure is shown.

[0063] Figure 3 A schematic diagram of a process according to an embodiment of the present disclosure is shown.

[0064] Figure 4 A schematic diagram of a process according to an embodiment of the present disclosure is shown.

[0065] Figure 5 A schematic diagram of a process according to an embodiment of the present disclosure is shown.

[0066] Figure 6 A schematic diagram of a process according to an embodiment of the present disclosure is shown.

[0067] Figure 7 A schematic diagram of a process according to an embodiment of the present disclosure is shown.

[0068] Figure 8 An example of a schematic diagram of a wireless communication terminal according to an embodiment of the present disclosure is shown.

[0069] Figures 9 to 10 A flowchart of a wireless communication method according to some embodiments of the present disclosure is shown. Detailed Implementation

[0070] Figure 1 A schematic diagram of a network according to an embodiment of the present disclosure is shown. In some embodiments, the network function (NF) in the 5GC includes:

[0071] Access and Mobility Management Function (AMF): Manages access and mobility-related functions of user equipment (UE) in the network, such as authentication, security, session management, and mobility management.

[0072] Session Management Function (SMF): Handles session-related functions for the UE's data sessions, such as establishing, modifying, and terminating them. It ensures efficient data routing and manages Quality of Service (QoS) policies.

[0073] User Data Repository (UDR): Stores and manages user-related data, including subscription and profile information, authentication certificates, and service-related data. It provides the necessary information for various network functions.

[0074] Policy Control Function (PCF): Enforces policy rules and manages the QoS of individual users or user groups. It ensures that network resources are allocated appropriately and that service level agreements are met.

[0075] Network Open Function (NEF): Enables authorized third-party applications and services to securely access network data and functions. It provides external service providers with a standardized interface for interacting with 5GC.

[0076] Network Repository Function (NRF): Maintains a registry of network functions and their corresponding addresses in 5GC. It facilitates the discovery and selection of network functions during service setup and operation.

[0077] Location Retrieval Function (LRF): Retrieves the UE's location information for location-based services. It provides the necessary positioning data to support services that require location awareness.

[0078] Gateway Mobile Location Center (GMLC): Provides location-based services by retrieving location information from the LRF and passing it on to authorized applications or services.

[0079] Location Management Function (LMF): Manages location-related functions, including tracking the UE's location, updating location information, and supporting mobility management in the network.

[0080] In some embodiments, the 5GC collaborates with the NG-RAN and the UE to enable seamless connectivity and advanced services. The NG-RAN provides the radio access network for the UE, while the 5GC manages core network functions.

[0081] The terminology used in some embodiments of this disclosure is shown below, but this disclosure is not limited thereto.

[0082] Location: A function to detect the geographical location and speed of a mobile terminal (optional).

[0083] Distance measurement: A function that determines the distance between two or more UEs and / or the direction between one UE (target UE) and another UE (reference UE) via a PC5 interface.

[0084] Sidelink positioning: A function that uses PC5 to obtain absolute position, relative position, or ranging information to locate the UE.

[0085] SL Positioning Client UE: A third-party UE, distinct from the SL Reference UE and Target UE, that initiates ranging / sidelink positioning service requests on behalf of the application. The SL Positioning Client UE does not necessarily need to support ranging / sidelink positioning capabilities, but it establishes communication with the SL Reference UE / Target UE via PC5 or 5GC to transmit service requests and receive results.

[0086] SL Positioning Server UE: A UE that provides functions such as method determination, auxiliary data distribution, and location calculation for sidelink-based positioning and ranging services. The SL Positioning Server UE interacts with other UEs via PC5 as needed to determine the ranging / SL positioning method, distribute auxiliary data, and calculate the location of the target UE. Both the target UE and the SL reference UE can act as SL Positioning Server UEs if they support any of these functions.

[0087] Target UE: A UE whose distance, orientation, and / or location are measured with the support of one or more SL reference UEs using sidelink in ranging-based service and sidelink positioning.

[0088] In some embodiments, the ranging-based service provides the distance between two or more UEs and / or the direction between one UE (i.e., the target UE) and another UE (i.e., the reference UE) via the PC5 interface (also referred to as PC5).

[0089] In some embodiments, sidelink positioning utilizes the PC5 interface to provide the absolute position, relative position, or ranging information of the UE. By using sidelink positioning, the location of a target UE can be determined based on information obtained from the positioned UE.

[0090] In some embodiments, authorized SL positioning client UEs, 5GC NFs, or AFs (application functions) can access the ranging / SL positioning service to obtain relative positions or distance / direction results between UEs capable of ranging / SL positioning. Furthermore, if ranging / SL positioning is determined to be applicable, authorized 5GC NFs, AFs, or LCS (Location Services) clients can use the service to obtain the absolute position of the target UE.

[0091] In some embodiments, the selection of an SL reference UE during ranging / SL positioning services via PC5 may correspond to certain factors. For example:

[0092] If the target UE / SL reference UE has a NAS (non-access stratum) connection, it means that the target UE / SL reference UE can receive information from the network.

[0093] If the target UE / SL reference UE does not have a NAS connection but is served by the RAN, it means that the target UE / SL reference UE can establish a NAS connection.

[0094] If the target UE / SL reference UE can act as an authorization server, it means that it can provide authorization services.

[0095] Figure 2 A schematic diagram of a process according to an embodiment of the present disclosure is shown. Figure 2 In this process, ranging / SL positioning of the UE can be used for discovery in Model A. In some embodiments, the process includes at least one of the following configurations.

[0096] 1. The notifying UE (ranging / SL positioning UE-1) sends a ranging / SL positioning notification message to one or more monitoring UEs (in this case, three monitoring UEs (ranging / SL positioning UE-2 to ranging / SL positioning UE-4)). In some embodiments, the ranging / SL positioning notification message includes at least one of the following: the type of discovery message, security protection elements, RSPP (ranging / sidelink positioning protocol) metadata information, and / or the user information ID of the notifying UE.

[0097] In some embodiments, the destination Layer 2 ID of the ranging / SL positioning announcement message is used to send the ranging / SL positioning announcement message.

[0098] In some embodiments, the source Layer 2 ID of the ranging / SL positioning announcement message used to send the ranging / SL positioning announcement message is assigned by the announcing UE itself.

[0099] In some embodiments, an announcement message is sent when the UE is authorized to assume the corresponding UE role indicated in the RSPP metadata information. In some embodiments, an announcement message is not sent when the UE is not authorized to assume the corresponding UE role indicated in the RSPP metadata information.

[0100] In some embodiments, for announcing UE that acts as a positioning UE, the ranging / SL positioning announcement message also includes the serving PLMN (Public Land Mobile Network) of the announcing UE.

[0101] In some embodiments, the user information ID of the notifying UE corresponds to the application layer ID of the notifying UE.

[0102] In some embodiments, the monitoring UE determines the destination Layer 2 ID for signaling reception based on its configuration.

[0103] In some embodiments, the monitoring UE selects the advertising UE based on information received from the advertising UE (UE-1).

[0104] Figure 3 A schematic diagram of a process according to an embodiment of the present disclosure is shown. Figure 3 In this process, ranging / SL positioning for UE discovery is employed as described in Model B. In some embodiments, the process includes at least one of the following operations, steps, and / or configurations.

[0105] 1. The discoverer UE (ranging / SL positioning UE-1) sends a ranging / SL positioning solicitation message to one or more discoveree UEs (in this case, three monitoring UEs (ranging / SL positioning UE-2 to ranging / SL positioning UE-4)). In some embodiments, the ranging / SL positioning solicitation message includes at least one of the following: the type of discovery message, a security protection element, the discoverer UE's user information ID (optional), target information, the discoverer UE's user information ID, and / or RSPP metadata information (optional).

[0106] In some embodiments, the destination Layer 2 ID of the ranging / SL positioning solicitation message is used to send the ranging / SL positioning solicitation message.

[0107] In some embodiments, the source Layer 2 ID of the ranging / SL positioning solicitation message used to send the ranging / SL positioning solicitation message is assigned by the discoverer UE itself.

[0108] In some embodiments, the discovered UE sends a response message when it is authorized to assume the corresponding UE role indicated in the solicitation message. In some embodiments, the discovered UE does not send a response message when it is not authorized to assume the corresponding UE role indicated in the solicitation message.

[0109] In some embodiments, for the discovered role being the location UE, the ranging / SL location response message also includes the serving PLMN (Public Land Mobile Network) of the discovered UE.

[0110] In some embodiments, the discoverer UE's user information ID corresponds to the discoverer UE's application layer ID.

[0111] In some embodiments, the user information ID of the discoverer UE is used to identify the specific UE that the discoverer UE wants to discover, and it is identified by the application layer ID of the discoverer UE.

[0112] In some embodiments, the discoverer UE determines the destination Layer 2 ID for signaling reception based on configuration.

[0113] 2. The discoverer UE that matches the ranging / SL positioning solicitation message (e.g., RSPP metadata information) responds to the discoverer UE with a ranging / SL positioning response message. In some embodiments, the ranging / SL positioning response message includes at least one of the discovery message type, security protection element, RSPP metadata information, and / or the discoverer UE's user information ID.

[0114] In some embodiments, the source Layer 2 ID of the ranging / SL positioning response message is used to send the ranging / SL positioning response message.

[0115] In some embodiments, the destination Layer 2 ID of the ranging / SL positioning response message is set to the source Layer 2 ID of the received ranging / SL positioning solicitation message.

[0116] In some embodiments, the user information ID of the discoverer UE corresponds to the application layer ID of the discoverer UE.

[0117] Figure 4 A schematic diagram of a process according to an embodiment of the present disclosure is shown. Figure 4 The diagram illustrates a process for exposing services to a client UE via PC5 to the SL location service. In some embodiments, this process includes at least one of the following operations, steps, and / or configurations.

[0118] 1. When the ranging / SL positioning service is triggered, the SL positioning client UE can perform a discovery procedure. In some embodiments, the discovery procedure includes at least one of the following:

[0119] - When the SL location service is triggered, the client UE attempts to discover the target UE and / or the SL reference UE. When using Model B discovery, the solicitation message includes the user information of the target UE, and the roles of the target UE and the SL reference UE are indicated in the RSPP metadata.

[0120] - When ranging service is triggered, the client UE attempts to discover UE1 and / or UE2. When using Model B discovery, the solicitation message includes user information for UE1 and UE2, and the role of the target UE is indicated in the RSPP metadata.

[0121] In some embodiments, information about the SL reference UE is obtained during the discovery of the SL location service.

[0122] 2. If the discovery process is successful, SL locates the client UE and establishes a PC5 connection with one or more discovered UEs (e.g., UE1, UE2).

[0123] 3. The SL locates the client UE and receives UE status information from one or more discovered UEs. In some embodiments, the UE status information indicates whether the one or more discovered UEs have a NAS connection.

[0124] In some embodiments, the SL positioning client UE can receive a list of SL reference UEs from the target UE via a PC5 connection.

[0125] 4. The SL positioning client UE transmits an SL positioning service request to one or more of the discovered UEs. In some embodiments, the SL positioning client UE selects one or more UEs to perform the SL positioning operation. In some embodiments, the SL positioning client UE selects one or more of the discovered UEs (e.g., UE1 and UE2) to perform the SL positioning operation based on the received UE status information. In some embodiments, the SL positioning client UE selects one UE (e.g., UE1) from the discovered one or more UEs to receive the SL positioning service request based on the received UE status information.

[0126] In some embodiments, the SL positioning service request includes at least one of the following: information about the SL positioning client UE, the target UE, and / or the SL reference UE for SL positioning.

[0127] In some embodiments, the SL positioning service request includes at least one of the information of the SL positioning client UE, UE1, and UE2 for ranging.

[0128] In some embodiments, the SL positioning service request includes the two types of information described above for SL positioning and ranging.

[0129] 5. The authorization check of the client UE for the service request can be performed via at least one of the SL location server UE, 5GC (e.g., LMF), UE1 and / or UE2.

[0130] 6. Ranging / SL positioning operations are performed via at least one of the target UE, SL reference UE, and / or SL positioning server UE or LMF.

[0131] In some embodiments, the UE (UE1) that receives the SL location service request selects either the Location Management Function (LMF) or the SL location server UE based on its status regarding the NAS connection.

[0132] 7. The ranging / SL positioning results are provided by UE1 to the SL positioning client UE.

[0133] In some embodiments of this disclosure, the SL positioning UE can obtain status information of other UEs. The UE status information may include at least one of the following: whether the UE has a NAS connection, whether the UE is served by the RAN, whether the UE can act as an authorized server, and / or whether the UE can find an authorized server.

[0134] In some embodiments of this disclosure, the SL-locating UE can select an SL reference UE based on the UE state information of one or more candidate UEs. For example, the SL-locating UE can first select an SL reference UE based on whether one or more candidate UEs have a NAS connection, then based on whether one or more candidate UEs are served by a RAN, then based on whether one or more candidate UEs can act as an authorized server, and finally based on whether one or more candidate UEs can find (e.g., connect to) an authorized server.

[0135] Figure 5 A schematic diagram of a process according to an embodiment of the present disclosure is shown. Figure 5 In this process, ranging / SL positioning of the UE can be used for discovery in Model A. In some embodiments, the process includes at least one of the following configurations.

[0136] 0. The UE (e.g., ranging / SL positioning UE-1 to ranging / SL positioning UE-4) obtains a key for protecting the discovery message. In some embodiments, the key may be obtained from the network or an application, or it may be pre-configured. In some embodiments, when restricted discovery messages are transmitted between UEs via the PC5 interface, certain types of security may be used to protect the restricted discovery messages.

[0137] In some embodiments, such as in Open Discovery, integrity protection is provided through an attached Message Integrity Code (MIC). In some embodiments, the MIC is calculated using the received Discovery User Integrity Key (DUIK) at the sending UE and can be checked at the receiving UE using the provided DUIK, or at the ProSe (Proximity Service) function.

[0138] In some embodiments, scrambling protection can be used to ensure that there is no relationship between discovery messages sent by a particular UE, i.e., to prevent tracking of the UE over time. In some embodiments, a scrambling key stream is calculated based on the discovery user scrambling key (DUSK) and a UTC (Coordinated Universal Time) based counter associated with the discovery time slot.

[0139] In some embodiments, message-specific confidentiality can be used to provide confidentiality protection for a portion of a discovery message. In some embodiments, message-specific confidentiality can be used when several UEs use the same DUSK, or if it is desirable to obfuscate a portion of a discovery message from several UEs that are authorized to discover. In some embodiments, a key stream is calculated based on the discovery user confidentiality key (DUCK), the message content, and a UTC-based counter associated with the discovery slot.

[0140] 1. The notifying UE (ranging / SL positioning UE-1) sends a ranging / SL positioning notification message to one or more monitoring UEs (in this case, three monitoring UEs (ranging / SL positioning UE-2 to ranging / SL positioning UE-4)). In some embodiments, the ranging / SL positioning notification message includes at least one of the following: the type of discovery message, security protection elements, RSPP (ranging / sidelink positioning protocol) metadata information, and / or the user information ID of the notifying UE.

[0141] In some embodiments, the destination Layer 2 ID of the ranging / SL positioning announcement message is used to send the ranging / SL positioning announcement message.

[0142] In some embodiments, the source Layer 2 ID of the ranging / SL positioning announcement message used to send the ranging / SL positioning announcement message is assigned by the announcing UE itself.

[0143] In some embodiments, the notifying UE sends an announcement message when it is authorized to assume the corresponding UE role indicated in the RSPP metadata information. In some embodiments, the notifying UE does not send an announcement message when it is not authorized to assume the corresponding UE role indicated in the RSPP metadata information.

[0144] In some embodiments, for announcing UE that acts as a positioning UE, the ranging / SL positioning announcement message also includes the serving PLMN (Public Land Mobile Network) of the announcing UE.

[0145] In some embodiments, the user information ID of the notifying UE corresponds to the application layer ID of the notifying UE.

[0146] In some embodiments, RSPP metadata information may include at least one of the following: informing whether the UE has a NAS connection, informing whether the UE is served by the RAN, informing whether the UE can act as an SL location server UE or an authorized server, and / or informing whether the UE can find an SL location server UE and / or an authorized server.

[0147] In some embodiments, the security protection element may indicate at least one of the following: whether the notification message (e.g., RSPP metadata) is protected and / or the key used to protect the notification message. In some embodiments, the notification message (e.g., RSPP metadata) may be protected by a key (e.g., DUIK, DUSK, or DUCK) received in operation 0 above.

[0148] In some embodiments, the monitoring UE determines the destination Layer 2 ID for signaling reception based on its configuration.

[0149] In some embodiments, the monitoring UE selects the advertising UE based on information received from the advertising UE (UE-1).

[0150] Figure 6 A schematic diagram of a process according to an embodiment of the present disclosure is shown. Figure 6 In this process, ranging / SL positioning of the UE can be used in Model B for UE discovery. In some embodiments, the process includes at least one of the following operations, steps, and / or configurations.

[0151] 0. The UE (e.g., ranging / SL positioning UE-1 to ranging / SL positioning UE-4) obtains a key for protecting the discovery message. In some embodiments, the key may be obtained from the network or an application, or it may be pre-configured. In some embodiments, when restricted discovery messages are transmitted between UEs via the PC5 interface, certain types of security may be used to protect the restricted discovery messages.

[0152] In some embodiments, such as in Open Discovery, integrity protection is provided through an Attached Message Integrity Code (MIC). In some embodiments, the MIC is calculated using the received Discovery User Integrity Key (DUIK) at the sending UE and can be checked at the receiving UE using the provided DUIK, or at the ProSe (Proximity Service) function.

[0153] In some embodiments, scrambling protection can be used to ensure that there is no relationship between discovery messages sent by a particular UE, i.e., to prevent tracking of the UE over time. In some embodiments, a scrambling key stream is calculated based on the discovery user scrambling key (DUSK) and a UTC (Coordinated Universal Time) based counter associated with the discovery time slot.

[0154] In some embodiments, message-specific confidentiality can be used to provide confidentiality protection for a portion of a discovery message. In some embodiments, message-specific confidentiality can be used when several UEs use the same DUSK, or if it is desirable to obfuscate a portion of a discovery message from several UEs that are authorized to discover. In some embodiments, a key stream is calculated based on the discovery user confidentiality key (DUCK), the message content, and a UTC-based counter associated with the discovery slot.

[0155] 1. The discoverer UE (ranging / SL positioning UE-1) sends a ranging / SL positioning solicitation message to one or more discoverer UEs (in this case, three monitoring UEs (ranging / SL positioning UE-2 to ranging / SL positioning UE-4)). In some embodiments, the ranging / SL positioning solicitation message includes at least one of the following: the type of discovery message, a security protection element, the discoverer UE's user information ID (optional), target information, the discoverer UE's user information ID, and / or RSPP metadata information (optional).

[0156] In some embodiments, the destination Layer 2 ID of the ranging / SL positioning solicitation message is used to send the ranging / SL positioning solicitation message.

[0157] In some embodiments, the source Layer 2 ID of the ranging / SL positioning solicitation message used to send the ranging / SL positioning solicitation message is assigned by the discoverer UE itself.

[0158] In some embodiments, the discovered UE sends a response message when it is authorized to assume the corresponding UE role indicated in the solicitation message. In some embodiments, the discovered UE does not send a response message when it is not authorized to assume the corresponding UE role indicated in the solicitation message.

[0159] In some embodiments, for the discovered role being the location UE, the ranging / SL location response message also includes the serving PLMN (Public Land Mobile Network) of the discovered UE.

[0160] In some embodiments, the discoverer UE's user information ID corresponds to the discoverer UE's application layer ID.

[0161] In some embodiments, the user information ID of the discoverer UE is used to identify the specific UE that the discoverer UE wants to discover, and it is identified by the application layer ID of the discoverer UE.

[0162] In some embodiments, the discoverer UE determines the destination Layer 2 ID for signaling reception based on configuration.

[0163] In some embodiments, RSPP metadata information can be used to obtain status information from other UEs. In some embodiments, RSPP metadata information can indicate what information the discovering UE wants to obtain. In some embodiments, RSPP metadata information may include at least one of the following: a request regarding whether the discovering UE has a NAS connection, a request regarding whether the discovering UE is served by the RAN, a request regarding whether the discovering UE can act as an SL location server UE or an authorized server, and / or a request regarding whether the discovering UE can find an SL location server UE or an authorized server.

[0164] In some embodiments, the security protection element may indicate at least one of the following: whether the notification message (e.g., RSPP metadata) is protected and / or the key used to protect the notification message. In some embodiments, the notification message (e.g., RSPP metadata) may be protected by a key (e.g., DUIK, DUSK, or DUCK) received in operation 0 above.

[0165] 2. The discoverer UE that matches the ranging / SL positioning solicitation message (e.g., RSPP metadata information) responds to the discoverer UE with a ranging / SL positioning response message. In some embodiments, the ranging / SL positioning response message includes at least one of the discovery message type, security protection element, RSPP metadata information, and / or the discoverer UE's user information ID.

[0166] In some embodiments, the source Layer 2 ID of the ranging / SL positioning response message is used to send the ranging / SL positioning response message.

[0167] In some embodiments, the destination Layer 2 ID of the ranging / SL positioning response message is set to the source Layer 2 ID of the received ranging / SL positioning solicitation message.

[0168] In some embodiments, the user information ID of the discoverer UE corresponds to the application layer ID of the discoverer UE.

[0169] In some embodiments, based on the indication or request received from step 1 above, the RSPP metadata information may include at least one of the following: whether the discoverer UE has a NAS connection, whether the discoverer UE is served by the RAN, whether the discoverer UE can act as an SL location server UE or an authorized server, and / or whether the discoverer UE can find an SL location server UE or an authorized server.

[0170] In some embodiments, RSPP metadata is protected based on the instructions in the security protection element received in step 1 above.

[0171] Figure 7 A schematic diagram of a process according to an embodiment of the present disclosure is shown. Figure 7 The diagram illustrates a process for exposing services to a client UE via PC5 to the SL location service. In some embodiments, this process includes at least one of the following operations, steps, and / or configurations.

[0172] 1. When the ranging / SL positioning service is triggered, the SL positioning client UE can perform a discovery procedure. In some embodiments, the discovery procedure includes at least one of the following:

[0173] - When the SL location service is triggered, the client UE attempts to discover the target UE and / or the SL reference UE. When using Model B discovery, the solicitation message includes the user information of the target UE, and the roles of the target UE and the SL reference UE are indicated in the RSPP metadata.

[0174] When ranging service is triggered, the client UE attempts to discover UE1 through UEn, where n is an integer. When using Model B discovery, the solicitation message includes user information for UE1 through UEn, and the role of the target UE is indicated in the RSPP metadata.

[0175] In some embodiments, during the discovery of SL location services, the SL location client UE obtains status information of the SL reference UE (e.g., UE1 to UEn). In some embodiments, the status information may include at least one of the following: whether the corresponding SL reference UE has a NAS connection, whether the corresponding SL reference UE is served by the RAN, whether the corresponding SL reference UE can act as an SL location server UE or an authorizing server, and / or whether the corresponding SL reference UE can find an SL location server UE or an authorizing server.

[0176] In some embodiments, it can be achieved by using with Figure 5 and Figure 6 The corresponding process is executed to discover this, and the details will not be repeated here.

[0177] 2. If the discovery process is successful, SL locates the client UE and establishes a PC5 connection with one or more discovered UEs (e.g., UE1 to UEn).

[0178] 3. The SL locates the client UE and stores a list of SL reference UEs (e.g., UE1 to UEn).

[0179] 4. Before the SL positioning UE sends an SL positioning service request to the SL reference UE (e.g., UE1), if the SL positioning client UE has not obtained the status information of the SL reference UE (e.g., UE1) from step 1 above, the SL positioning client UE sends a UE status request to the SL reference UE (e.g., UE1). In some embodiments, the SL positioning client UE selects the SL reference UE (e.g., UE1) to which the UE status request is sent based on a list of SL reference UEs. For example, the SL positioning client UE can select the SL reference UE (e.g., UE1) at the top of the list. In some embodiments, the UE status request message indicates specific information that the SL positioning UE intends to obtain. The specific information includes at least one of the following: whether the SL reference UE has a NAS connection, whether the SL reference UE is served by the RAN, whether the SL reference UE can act as an SL positioning server UE or an authorized server, and / or whether the SL reference UE can find an SL positioning server UE or an authorized server.

[0180] 5. The SL reference UE (e.g., UE1) transmits its status information to the SL positioning client UE in response to a UE status request message. In some embodiments, the status information includes at least one of the following: whether the SL reference UE has a NAS connection, whether the SL reference UE is served by the RAN, whether the SL reference UE can act as an SL positioning server UE or an authorized server, and / or whether the SL reference UE can find an SL positioning server UE or an authorized server.

[0181] 4a. If the SL reference UE (e.g., UE1) responds with its status information, since the SL reference UE does not have a NAS connection, the SL positioning client UE can select the next SL reference UE (UE2 / ... / UEn) and send a UE status request to the next SL reference UE (UE2 / ... / UEn).

[0182] 5a. In response to the UE status request message, the next SL reference UE transmits its status information to the SL positioning client UE. In some embodiments, the status information includes at least one of the following: whether the next SL reference UE has a NAS connection, whether the next SL reference UE is served by the RAN, whether the next SL reference UE can act as an SL positioning server UE or an authorized server, and / or whether the next SL reference UE can find an SL positioning server UE or an authorized server. Steps 4a and 5a may be repeated to obtain information from one or more UEs from UE2 to UEn.

[0183] 6. The SL positioning client UE transmits an SL positioning service request to one of the selected SL reference UEs.

[0184] In some embodiments, the SL positioning client UE selects one of the SL reference UEs with a NAS connection. In some embodiments, if none of the SL reference UEs have a NAS connection, the SL positioning client UE selects one of the SL reference UEs served by the RAN. In some embodiments, if the SL positioning client UE does not have information about which UE is served by the RAN, the SL positioning client UE can obtain UE status information from the SL reference UEs (e.g., UE1 to UEn) (e.g., as described in steps 4, 5, 4a, and 5a).

[0185] In some embodiments, if none of the SL reference UEs are served by the RAN, the SL positioning client UE selects a UE that can act as an SL positioning server UE or an authorized server. In some embodiments, if the SL positioning client UE does not have information about which UE can act as an SL positioning server UE or an authorized server, the SL positioning client UE can obtain UE status information from the SL reference UEs (e.g., UE1 to UEn) (e.g., as described in steps 4, 5, 4a, and 5a).

[0186] In some embodiments, if all SL reference UEs can act as SL location server UEs or authorized servers, the SL location client UE selects the UE that can find the SL location server UE or authorized server. In some embodiments, if the SL location client UE does not have information about which SL location server UE or authorized server can be found, the SL location client UE can obtain UE status information from the SL reference UEs (e.g., UE1 to UEn) (e.g., as described in steps 4, 5, 4a, and 5a).

[0187] In some embodiments, the SL positioning service request includes at least one of the following: information about the SL positioning client UE, the target UE, and / or the SL reference UE for SL positioning.

[0188] In some embodiments, the SL positioning service request includes at least one of the information of the SL positioning client UE, UE1, and UE2 for ranging.

[0189] In some embodiments, the SL positioning service request includes the two types of information described above for SL positioning and ranging.

[0190] 7. The authorization check of the client UE for the service request can be performed via the SL location server UE, 5GC (e.g., LMF) and / or one or more of UE1 to UEn.

[0191] 8. Ranging / SL positioning operations are performed via at least one of the target UE, SL reference UE, and / or SL positioning server UE or LMF.

[0192] In some embodiments, the UE (UE1) that receives the SL location service request selects either the Location Management Function (LMF) or the SL location server UE based on its status regarding the NAS connection.

[0193] 9. The ranging / SL positioning results are provided by UE1 to the SL positioning client UE.

[0194] The following paragraphs will describe details with examples, but this disclosure is not limited to the examples below.

[0195] Figure 8 This is a schematic diagram relating to a wireless communication terminal 30 according to an embodiment of the present disclosure. The wireless communication terminal 30 may be a tag, mobile phone, laptop computer, tablet computer, e-book reader, or portable computer system, and is not limited thereto. The wireless communication terminal 30 can be used to implement the notification UE, monitoring UE, discoverer UE, found UE, SL location client UE, and / or SL reference UE described in this disclosure. The wireless communication terminal 30 may include a processor 300 such as a microprocessor or application-specific integrated circuit (ASIC), a storage unit 310, and a communication unit 320. The storage unit 310 may be any data storage device storing program code 312 accessed and executed by the processor 300. Embodiments of storing code 312 include, but are not limited to, a user identity module (SIM), read-only memory (ROM), flash memory, random access memory (RAM), hard disk, and optical data storage devices. The communication unit 320 may be a transceiver and is used to transmit and receive signals (e.g., messages or packets) based on the processing results of the processor 300. In embodiments, the communication unit 320 transmits and receives signals via at least one antenna 322 or via wiring.

[0196] In this embodiment, the storage unit 310 and the program code 312 may be omitted, and the processor 300 may include a storage unit with stored program code.

[0197] The processor 300 can implement any of the steps in the exemplary embodiment on the wireless communication terminal 30, for example, by executing program code 312.

[0198] The communication unit 320 may be a transceiver. Alternatively or as a supplement, the communication unit 320 may be combined with a transmitting unit and a receiving unit configured to transmit signals to and receive signals from a wireless communication node or another wireless communication terminal, respectively.

[0199] In some embodiments, the wireless communication terminal 30 can be used to perform the operations described in this disclosure as notifying the UE, monitoring the UE, discovering the UE, being found by the UE, SL positioning client UE, and / or SL reference UE. In some embodiments, the processor 300 and the communication unit 320 cooperate to perform the operations described in this disclosure. For example, the processor 300 performs operations and transmits or receives signals, messages, and / or information through the communication unit 320.

[0200] Embodiments of this disclosure also provide a wireless communication method. In an embodiment, the wireless communication method can be performed using a wireless communication terminal (e.g., a UE). In an embodiment, the wireless communication terminal can be implemented using the wireless communication terminal 30 described in this disclosure, but is not limited thereto.

[0201] See Figure 9 In one embodiment, the wireless communication method includes: transmitting a request for a sidelink SL location-related service from a first wireless communication terminal to one of the second wireless communication terminals, wherein the one of the second wireless communication terminals is selected from among the second wireless communication terminals based on the status information of the second wireless communication terminals.

[0202] For details on this, please refer to the paragraphs above; they will not be repeated here.

[0203] According to embodiments of this disclosure, a wireless communication method is also provided. In embodiments, this wireless communication method can be performed using a wireless communication terminal (e.g., a UE). In embodiments, the wireless communication terminal can be implemented using the wireless communication terminal 30 described in this disclosure, but is not limited thereto.

[0204] refer to Figure 10 In one embodiment, the wireless communication method includes: a second wireless communication terminal receiving a request for a location-related service of a cross-link SL from a first wireless communication terminal, wherein the second wireless communication terminal selects the service based on its own status information.

[0205] For details on this, please refer to the paragraphs above; they will not be repeated here.

[0206] In some embodiments, the first wireless communication terminal used in this disclosure may indicate the aforementioned notification UE, monitoring UE, discoverer UE, founder UE, or SL location client UE.

[0207] In some embodiments, the second wireless communication terminal used in this disclosure may indicate the aforementioned notification UE, monitoring UE, discoverer UE, founder UE, or SL reference UE.

[0208] In some embodiments, the messages used in this disclosure for the discovery process may indicate the aforementioned ranging and sidelink positioning response messages or ranging and sidelink positioning announcement messages.

[0209] In some embodiments, the discovery message used in this disclosure may indicate the aforementioned ranging and sidelink location notification messages.

[0210] In some embodiments, the discovery response message used in this disclosure may indicate the aforementioned ranging and sidelink positioning response messages.

[0211] While various embodiments of this disclosure have been described above, it should be understood that they are presented by way of example only and not by way of limitation. Similarly, various figures may depict exemplary architectures or configurations provided to enable those skilled in the art to understand the exemplary features and functionality of this disclosure. However, those skilled in the art should understand that this disclosure is not limited to the exemplary architectures or configurations shown, but can be implemented using various alternative architectures and configurations. Furthermore, as will be understood by those skilled in the art, one or more features of one embodiment may be combined with one or more features of another embodiment described herein. Therefore, the breadth and scope of this disclosure should not be limited to any of the exemplary embodiments described above.

[0212] It should be understood that in this disclosure, the term "and / or" or the symbol " / " can include any and all combinations of one or more of the related listed items. For example, A and / or B and / or C includes any and all combinations of one or more of A, B, and C, including combinations of A, B, C, A and B, A and C, B and C, and A and B and C. Similarly, A / B / C includes any and all combinations of one or more of A, B, and C, including combinations of A, B, C, A and B, A and C, B and C, and A and B and C.

[0213] It should also be understood that any reference to elements in this document, such as “first” or “second”, generally does not restrict the number or order of these elements. Rather, these names serve as a convenient way to distinguish two or more elements or instances of elements. Therefore, the reference to “first” and “second” elements does not imply that only two elements can be used, or that the first element must somehow precede the second element.

[0214] Furthermore, those skilled in the art will understand that information and signals can be represented using any of a variety of different techniques and skills. For example, data, instructions, commands, information, signals, bits, and symbols that may be referenced in the above description can be represented by voltage, current, electromagnetic waves, magnetic fields or particles, light fields or particles, or any combination thereof.

[0215] Those skilled in the art should also understand that any of the various illustrative logic blocks, units, processors, devices, circuits, methods, and functions described in connection with the aspects disclosed herein may be implemented by electronic hardware (e.g., digital implementation, analog implementation, or a combination of both), firmware, various forms of program or design code containing instructions (which may be referred to herein as "software" or "software unit" for convenience), or any combination of these techniques.

[0216] To clearly illustrate this interchangeability of hardware, firmware, and software, various illustrative components, blocks, units, circuits, and steps have been generally described above in terms of their functionality. Whether this functionality is implemented as hardware, firmware, software, or a combination of these technologies depends on the specific application and the design constraints imposed on the overall system. Skilled artisans can implement the described functionality in various ways for each specific application, but such implementation decisions will not lead to a departure from the scope of this disclosure. According to various embodiments, processors, devices, components, circuits, structures, machines, units, etc., can be configured to perform one or more of the functions described herein. The terms “configured to” or “configured for” used herein with respect to a specified operation or function refer to processors, devices, components, circuits, structures, machines, units, etc., which are physically constructed, programmed, and / or arranged to perform the specified operation or function.

[0217] Furthermore, those skilled in the art will understand that the various illustrative logic blocks, units, devices, components, and circuits described herein may be implemented within or executed by an integrated circuit (IC), which 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, or any combination thereof. Logic blocks, units, and circuits may also include antennas and / or transceivers for communicating with various components within a network or device. A general-purpose processor may be a microprocessor, but alternatively, the processor may be any conventional processor, controller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor), multiple microprocessors, one or more microprocessors combined with a DSP core, or any other suitable configuration for performing the functions described herein. If implemented in software, these functions may be stored as one or more instructions or code on a computer-readable medium. Therefore, the steps of the methods or algorithms disclosed herein may be implemented as software stored on a computer-readable medium.

[0218] Computer-readable media include computer storage media and communication media, including any medium that enables a computer program or code to be transferred from one place to another. Storage media can be any available medium that is accessible to a computer. By way of example, and not limitation, such computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage devices, or any other medium that can be used to store desired program code in the form of instructions or data structures and that is accessible to a computer.

[0219] In this application, the term "unit" as used herein refers to software, firmware, hardware, and any combination of such elements for performing the relevant functions described herein. Furthermore, for the purposes of discussion, various units are described as discrete units; however, as will be apparent to those skilled in the art, two or more units may be combined to form a single unit that performs the relevant functions according to embodiments of this disclosure.

[0220] Furthermore, in embodiments of this disclosure, memory or other memory, as well as communication components, may be used. It should be understood that, for clarity, the above description refers to embodiments of this disclosure with reference to different functional units and processors. However, it will be apparent that any suitable functional distribution among different functional units, processing logic elements, or domains may be used without departing from this disclosure. For example, a function illustrated as being performed by a separate processing logic element or controller may be performed by the same processing logic element or controller. Therefore, references to specific functional units are merely references to suitable means for providing said function and do not indicate a strict logical or physical structure or organization.

[0221] Various modifications to the embodiments described herein will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the scope of the claims. Therefore, this disclosure is not intended to be limited to the embodiments shown herein, but is to be given the broadest scope consistent with the novel features and principles disclosed herein, as set forth in the following claims.

Claims

1. A wireless communication method, comprising: A request for a sidelink SL location-related service is transmitted from a first wireless communication terminal to one of the second wireless communication terminals, wherein one of the second wireless communication terminals is selected from among the second wireless communication terminals based on the status information of the second wireless communication terminal.

2. The wireless communication method according to claim 1, wherein, The status information includes at least one of the following: Information regarding whether the corresponding second wireless communication terminal has a non-access stratum (NAS) connection. Information regarding whether the corresponding second wireless communication terminal is served by the Radio Access Network (RAN). Information regarding whether the corresponding second wireless communication terminal can act as an SL positioning server user equipment (UE) or authorization server, or Information regarding whether the corresponding second wireless communication terminal can locate the SL positioning server UE or the authorized server.

3. The wireless communication method according to claim 1 or 2, further comprising at least one of the following: One of the second wireless communication terminals is selected based on whether each second wireless communication terminal has a NAS connection; In response to each second wireless communication terminal not having a NAS connection, one of the second wireless communication terminals is selected based on whether the second wireless communication terminal is served by the RAN. In response to each second wireless communication terminal not being served by the RAN, one of the second wireless communication terminals is selected based on whether the second wireless communication terminal can act as an SL positioning server UE or an authorization server; or In response to each second wireless communication terminal being unable to act as an SL positioning server UE or an authorization server, one of the second wireless communication terminals is selected based on whether the second wireless communication terminal can find an SL positioning server UE or an authorization server.

4. The wireless communication method according to claim 3, further comprising: In response to a portion of the second wireless communication terminal having a NAS connection, one of the second wireless communication terminals is selected from the portion of the second wireless communication terminals having a NAS connection.

5. The wireless communication method according to claim 3 or 4, further comprising: In response to a portion of the second wireless communication terminal being served by the RAN, one of the second wireless communication terminals is selected from the portion of the second wireless communication terminals served by the RAN.

6. The wireless communication method according to any one of claims 3 to 5, further comprising: In response to a portion of the second wireless communication terminal being able to act as an SL positioning server UE or an authorization server, one of the second wireless communication terminals is selected from the portion of the second wireless communication terminals that are able to act as an SL positioning server UE or an authorization server.

7. The wireless communication method according to any one of claims 3 to 6, further comprising: In response to a portion of the second wireless communication terminal being able to locate the SL positioning server UE or the authorization server, one of the second wireless communication terminals is selected from the portion of the second wireless communication terminals that are able to locate the SL positioning server UE or the authorization server.

8. The wireless communication method according to any one of claims 1 to 7, further comprising: In response to a request for the status information transmitted from the first wireless communication terminal to the second wireless communication terminal, the first wireless communication terminal receives the status information from the second wireless communication terminal.

9. The wireless communication method according to any one of claims 1 to 8, further comprising: The first wireless communication terminal receives the status information of the second wireless communication terminal from the second wireless communication terminal via a message used in the discovery process for SL location-related services.

10. The wireless communication method according to any one of claims 1 to 9, further comprising: The first wireless communication terminal stores a list of the second wireless communication terminals based on messages used in the discovery process for SL location-related services, wherein the list is used by the first wireless communication terminal to select one of the second wireless communication terminals to which it transmits a request for the SL location-related services.

11. The wireless communication method according to any one of claims 1 to 10, further comprising: The first wireless communication terminal receives a discovery message from the second wireless communication terminal, the discovery message including the status information of the second wireless communication terminal.

12. The wireless communication method according to any one of claims 1 to 10, further comprising: The first wireless communication terminal transmits a discovery message to the second wireless communication terminal. The discovery message includes an indication in the discovery response message of the status information requested by the first wireless communication terminal.

13. The wireless communication method according to claim 11 or 12, wherein, The discovery message also includes an indication of at least one of whether the discovery message is encrypted or the encryption key of the discovery message.

14. The wireless communication method according to claim 13, wherein, The encryption key is also used to encrypt the discovery response message of SL location-related services transmitted from the second wireless communication terminal to the first wireless communication terminal.

15. A wireless communication method, comprising: The second wireless communication terminal receives a request for location-related services of the cross link SL from the first wireless communication terminal, wherein the second wireless communication terminal selects the cross link based on the status information of the second wireless communication terminal.

16. The wireless communication method according to claim 15, wherein, The status information includes at least one of the following: Information regarding whether the corresponding second wireless communication terminal has a non-access stratum (NAS) connection. Information regarding whether the corresponding second wireless communication terminal is served by the Radio Access Network (RAN). Information regarding whether the corresponding second wireless communication terminal can act as an SL positioning server user equipment (UE) or authorization server, or Information regarding whether the corresponding second wireless communication terminal can locate the SL positioning server UE or the authorized server.

17. The wireless communication method according to claim 15 or 16, further comprising: In response to a request for the status information transmitted from the first wireless communication terminal to the second wireless communication terminal, the second wireless communication terminal transmits the status information to the first wireless communication terminal.

18. The wireless communication method according to any one of claims 15 to 17, further comprising: The second wireless communication terminal transmits its status information to the first wireless communication terminal via a message used in the discovery process for SL location-related services.

19. The wireless communication method according to any one of claims 15 to 18, further comprising: The second wireless communication terminal transmits a discovery message, including the status information of the second wireless communication terminal, to the first wireless communication terminal.

20. The wireless communication method according to any one of claims 15 to 18, further comprising: The second wireless communication terminal receives a discovery message from the first wireless communication terminal, the discovery message including an indication in a discovery response message of the status information requested by the first wireless communication terminal; as well as The second wireless communication terminal transmits the discovery response message to the first wireless communication terminal. The discovery response message includes the content of the status information indicated by the indication in the discovery message.

21. The wireless communication method according to claim 19 or 20, wherein, The discovery message also includes an indication of at least one of whether the discovery message is encrypted or the encryption key of the discovery message.

22. The wireless communication method according to claim 21, wherein, The encryption key is also used to encrypt the discovery response message of SL location-related services transmitted from the second wireless communication terminal to the first wireless communication terminal.

23. A first wireless communication terminal, comprising: Communication unit; and A processor configured to transmit a request for a sidelink SL location-related service to one of the second wireless communication terminals via the communication unit, wherein the second wireless communication terminal is selected from among the second wireless communication terminals based on the status information of the second wireless communication terminal.

24. The first wireless communication terminal according to claim 23, wherein, The processor is also configured to perform the wireless communication method according to any one of claims 2 to 14.

25. A second wireless communication terminal, comprising: Communication unit; and A processor configured to receive a request for a location-related service (SL) from a first wireless communication terminal via the communication unit, wherein the second wireless communication terminal is selected based on the status information of the second wireless communication terminal.

26. The second wireless communication terminal according to claim 25, wherein, The processor is also configured to perform the wireless communication method according to any one of claims 16 to 22.

27. A computer program product comprising computer-readable program medium code stored thereon, the code, when executed by a processor, causing the processor to implement the wireless communication method according to any one of claims 1 to 22.

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