Terminal selection method, communication device, communication system and storage medium

Abstract

The invention relates to a terminal selection method, communication equipment, a communication system and a storage medium. The terminal selection method comprises the following steps: a first terminal receives first information and determines whether to select a second terminal according to the first information; as a result, it is possible to effectively support the selection of a terminal on the terminal side on the basis of the exchanged information.

Description

Terminal selection method, communication device, communication system, and storage medium Technical Field

[0001] The present disclosure relates to the field of communication technology, and in particular to a terminal selection method, communication equipment, a communication system, and a storage medium. Background Art

[0002] In order to support direct communication between terminals, a sidelink (SL) communication method is introduced. Ranging refers to determining the distance between two or more terminals, or the direction from one terminal to another, through a PC5 interface. A PC5 interface refers to a communication interface between terminals, such as a short-range direct communication interface between vehicles, people, and road infrastructure. Sidelink SL positioning refers to estimating the position of a located terminal based on the sidelink SL. For example, ranging or sidelink SL positioning can be performed on a located terminal (e.g., a target terminal (target user equipment, target UE)) based on information from a terminal (e.g., a positioning terminal (located user equipment, located UE)). The reference terminal can be, for example, an SL reference terminal whose position is known or can be known in ranging or sidelink SL positioning. For another example, the relative position information of a terminal (e.g., a target terminal (target user equipment, target UE)) and another terminal (e.g., an SL reference terminal (sidelink reference user equipment, sidelink reference UE)) can be determined through ranging or sidelink SL positioning.

[0003] Summary of the Invention

[0004] The embodiments of the present disclosure provide a terminal selection method, a network device, a terminal, a device, a chip system, a storage medium, a computer program, and a computer program product, which can be applied in the field of communication technology to solve the technical problem that "the related technology does not support the selection of a terminal based on the exchanged information on the terminal side."

[0005] The present disclosure provides a terminal selection method, a communication device, a communication system, and a storage medium.

[0006] According to a first aspect of an embodiment of the present disclosure, a terminal selection method is proposed, which is executed by a first terminal and includes: receiving first information; and determining whether to select a second terminal based on the first information.

[0007] According to a second aspect of an embodiment of the present disclosure, a terminal selection method is proposed, which is executed by a second terminal and includes: sending first information, wherein the first information is used by the first terminal to determine whether to select the second terminal.

[0008] According to a third aspect of an embodiment of the present disclosure, a terminal selection method is proposed, including: a second terminal sending first information; a first terminal receiving the first information, and determining whether to select the second terminal based on the first information.

[0009] According to a fourth aspect of an embodiment of the present disclosure, a terminal is proposed, including: a transceiver module for receiving first information; and a processing module for determining whether to select a second terminal based on the first information.

[0010] According to a fifth aspect of an embodiment of the present disclosure, a terminal is proposed, including: a transceiver module, configured to send first information, wherein the first information is used by the first terminal to determine whether to select a second terminal.

[0011] According to the sixth aspect of an embodiment of the present disclosure, a communication device is proposed, comprising: one or more processors; wherein the processor is used to call instructions to enable the communication device to execute the terminal selection method of any one of the first aspect, the second aspect, and the third aspect.

[0012] According to the seventh aspect of an embodiment of the present disclosure, a communication system is proposed, characterized in that it includes a first terminal and a second terminal, wherein the first terminal is configured to implement the terminal selection method of the first aspect, and the second terminal is configured to implement the terminal selection method of the second aspect.

[0013] According to the eighth aspect of the embodiment of the present disclosure, a storage medium is proposed, which stores instructions, and is characterized in that when the instructions are executed on a communication device, the communication device executes a terminal selection method as described in any one of the first, second, and third aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the background technology, the drawings required for use in the embodiments of the present disclosure or the background technology will be described below.

[0015] FIG1 is a schematic diagram of the architecture of a communication system according to an embodiment of the present disclosure;

[0016] FIG2 is an interactive schematic diagram illustrating a terminal selection method according to an embodiment of the present disclosure;

[0017] FIG3A is an interactive schematic diagram illustrating a terminal selection method according to another embodiment of the present disclosure;

[0018] FIG3B is an interactive schematic diagram illustrating a terminal selection method according to another embodiment of the present disclosure;

[0019] FIG3C is an interactive schematic diagram illustrating a terminal selection method according to another embodiment of the present disclosure;

[0020] FIG3D is an interactive schematic diagram illustrating a terminal selection method according to another embodiment of the present disclosure;

[0021] FIG4A is an interactive schematic diagram illustrating a terminal selection method according to another embodiment of the present disclosure;

[0022] FIG4B is an interactive schematic diagram illustrating a terminal selection method according to another embodiment of the present disclosure;

[0023] FIG4C is an interactive schematic diagram illustrating a terminal selection method according to yet another embodiment of the present disclosure;

[0024] FIG5 is an interactive schematic diagram illustrating a terminal selection method according to yet another embodiment of the present disclosure;

[0025] FIG6 shows a schematic diagram of a process of selecting or reselecting a terminal in consideration of the terminal's capabilities;

[0026] FIG7A is a schematic structural diagram of a terminal proposed in an embodiment of the present disclosure;

[0027] FIG7B is a schematic structural diagram of a terminal proposed in another embodiment of the present disclosure;

[0028] FIG8A is a schematic structural diagram of a communication device proposed in an embodiment of the present disclosure;

[0029] FIG8B is a schematic diagram of the structure of the chip proposed in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0030] The present disclosure provides a terminal selection method, communication device, communication system, and storage medium. In some embodiments, the terms "terminal selection method," "information processing method," and "communication method" are interchangeable; the terms "terminal selection device," "information processing device," and "communication device" are interchangeable; and the terms "information processing system" and "communication system" are interchangeable.

[0031] The embodiments of the present disclosure are not exhaustive and are merely illustrative of some embodiments, and are not intended to be a specific limitation on the scope of protection of the present disclosure. In the absence of contradiction, each step in a certain embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a certain embodiment can also be implemented as an independent embodiment, and the order of the steps in a certain embodiment can be arbitrarily exchanged. In addition, the optional implementation methods in a certain embodiment can be arbitrarily combined; in addition, the embodiments can be arbitrarily combined. For example, some or all steps of different embodiments can be arbitrarily combined, and a certain embodiment can be arbitrarily combined with the optional implementation methods of other embodiments.

[0032] In each embodiment of the present disclosure, unless otherwise specified or provided for by logic, the terms and / or descriptions between the embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form a new embodiment based on their inherent logical relationships.

[0033] The terms used in the embodiments of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure.

[0034] In the embodiments of the present disclosure, unless otherwise specified, elements expressed in the singular, such as "a", "an", "the", "above", "said", "the", "the", etc., may mean "one and only one", or "one or more", "at least one", etc. For example, when using articles such as "a", "an", "the" in English in translation, the noun following the article may be understood as a singular expression or a plural expression.

[0035] In the embodiments of the present disclosure, “plurality” refers to two or more.

[0036] In some embodiments, the terms "at least one," "one or more," "a plurality of," "multiple," etc. may be used interchangeably.

[0037] In some embodiments, descriptions such as "at least one of A and B," "A and / or B," "A in one case, B in another case," or "in response to one case A, in response to another case B" may include the following technical solutions depending on the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed); and in some embodiments, A and B (both A and B are executed). The above is also applicable when there are more branches such as A, B, and C.

[0038] In some embodiments, "A or B" and other descriptions may include the following technical solutions depending on the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed). The above is also applicable when there are more branches such as A, B, C, etc.

[0039] The prefixes such as "first" and "second" in the embodiments of the present disclosure are only used to distinguish different description objects and do not constitute any restriction on the position, order, priority, quantity or content of the description objects. For the statement of the description object, please refer to the description in the context of the claims or embodiments, and no unnecessary restriction should be constituted due to the use of prefixes. For example, if the description object is a "field", the ordinal number before the "field" in the "first field" and the "second field" does not limit the position or order between the "fields". "First" and "second" do not limit whether the "fields" they modify are in the same message, nor do they limit the order of the "first field" and the "second field". For another example, if the description object is a "level", the ordinal number before the "level" in the "first level" and the "second level" does not limit the priority between the "levels". For another example, the number of description objects is not limited by the ordinal number and can be one or more. Taking "first device" as an example, the number of "devices" can be one or more. In addition, the objects modified by different prefixes can be the same or different. For example, if the description object is "device", then the "first device" and the "second device" can be the same device or different devices, and their types can be the same or different; for another example, if the description object is "information", then the "first information" and the "second information" can be the same information or different information, and their contents can be the same or different.

[0040] In some embodiments, “including A,” “comprising A,” “used to indicate A,” and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

[0041] In some embodiments, terms such as "in response to...", "in response to determining...", "in the case of...", "at the time of...", "when...", "if...", "if...", etc. can be used interchangeably.

[0042] In some embodiments, terms such as "greater than", "greater than or equal to", "not less than", "more than", "more than or equal to", "not less than", "higher than", "higher than or equal to", "not less than", and "above" can be replaced with each other, and terms such as "less than", "less than or equal to", "not greater than", "less than", "less than or equal to", "not more than", "lower than", "lower than or equal to", "not higher than", and "below" can be replaced with each other.

[0043] In some embodiments, devices and equipment can be interpreted as physical or virtual, and their names are not limited to the names recorded in the embodiments. In some cases, they can also be understood as "equipment", "device", "circuit", "network element", "node", "function", "unit", "section", "system", "network", "chip", "chip system", "entity", "subject", etc.

[0044] In some embodiments, "network" can be interpreted as devices included in the network, such as access network equipment, core network equipment, etc.

[0045] In some embodiments, "access network device (AN device)" may also be referred to as "radio access network device (RAN device)", "base station (BS)", "radio base station", "fixed station", and in some embodiments may also be understood as "node", "access point", "transmission point (TP)", "reception point (RP)", "transmission and / or reception point (TRP)" "panel", "antenna panel", "antenna array", "cell", "macro cell", "small cell", "femto cell", "pico cell", "sector", "cell group", "serving cell", "carrier", "component carrier", "bandwidth part (BWP)", etc.

[0046] In some embodiments, "terminal" or "terminal device" may be referred to as "user equipment (UE)", "user terminal" "mobile station (MS)", "mobile terminal (MT)", subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, etc.

[0047] In some embodiments, obtaining data, information, etc. may comply with the laws and regulations of the country where the data is obtained.

[0048] In some embodiments, data, information, etc. may be obtained with the user's consent.

[0049] FIG1 is a schematic diagram showing the architecture of a communication system according to an embodiment of the present disclosure.

[0050] As shown in FIG1 , a communication system 100 includes a terminal 101, a terminal 102, a core network device 103, and an access network device 104. Terminal 101 or terminal 102 can be connected to core network device 103 via access network device 104. In some embodiments, terminal 101 or terminal 102 includes, for example, at least one of a mobile phone, a wearable device, an Internet of Things device, a car with communication capabilities, a smart car, a tablet computer, a computer with wireless transceiver capabilities, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical surgery, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, and a wireless terminal device in a smart home, but is not limited thereto.

[0051] In some embodiments, the communication system 100 may further include an access network device, which is, for example, a node or device that accesses a terminal to a wireless network. The access network device may include an evolved NodeB (eNB), a next generation evolved NodeB (ng-eNB), a next generation NodeB (gNB), a node B (NB), a home node B (HNB), a home evolved nodeB (HeNB), a wireless backhaul device, a radio network controller (RNC), a base station controller (BSC), a base transceiver station (BTS), a base band unit (BBU), a mobile switching center, a base station in a 6G communication system, an open base station (Open RAN), a cloud base station (Cloud RAN), a base station in other communication systems, and at least one of an access node in a wireless fidelity (WiFi) system, but is not limited thereto.

[0052] In some embodiments, the access network device 104 is, for example, a node or device that accesses the terminal to a wireless network. The access network device 104 may include an evolved NodeB (eNB), a next generation evolved NodeB (ng-eNB), a next generation NodeB (gNB), a node B (NB), a home node B (HNB), a home evolved nodeB (HeNB), a wireless backhaul device, a radio network controller (RNC), a base station controller (BSC), a base transceiver station (BTS), a base band unit (BBU), a mobile switching center, a base station in a 6G communication system, an open base station (Open RAN), a cloud base station (Cloud RAN), a base station in other communication systems, and at least one of an access node in a WiFi system, but is not limited thereto.

[0053] In some embodiments, the access network device 104 can be composed of a centralized unit (CU) and a distributed unit (DU), where the CU can also be called a control unit. The CU-DU structure can be used to split the protocol layer of the access network device, with the functions of some protocol layers centrally controlled by the CU, and the functions of the remaining part or all of the protocol layers distributed in the DU, which is centrally controlled by the CU, but is not limited to this.

[0054] In some embodiments, the core network device 103 may be a single device, or may be multiple devices or a group of devices. The core network may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), and a Next Generation Core (NGC).

[0055] It can be understood that the communication system described in the embodiment of the present disclosure is for the purpose of more clearly illustrating the technical solution of the embodiment of the present disclosure, and does not constitute a limitation on the technical solution provided by the embodiment of the present disclosure. Ordinary technicians in this field can know that with the evolution of the system architecture and the emergence of new business scenarios, the technical solution provided by the embodiment of the present disclosure is also applicable to similar technical problems.

[0056] The following embodiments of the present disclosure may be applied to the communication system 100 shown in Figure 1, or a portion thereof, but are not limited thereto. The entities shown in Figure 1 are illustrative only. The communication system may include all or part of the entities shown in Figure 1, or may include other entities outside of Figure 1. The number and form of the entities may be arbitrary. The connection relationship between the entities is illustrative only. The entities may be connected or disconnected, and the connection may be in any manner, including direct or indirect, wired or wireless.

[0057] The embodiments of the present disclosure can be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 5G new radio (NR), future radio access (FRA), new radio access technology (RAT), new radio (NR), new radio access (NX), future generation radio access (FX), Global System for Mobile Communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), Public Land Mobile Network (PLMN) networks, Device-to-Device (D2D) systems, Machine-to-Machine (M2M) systems, Internet of Things (IoT) systems, Vehicle-to-Everything (V2X), systems utilizing other communication methods, and next-generation systems based on and extending these methods. Furthermore, multiple systems may be combined (for example, a combination of LTE or LTE-A with 5G).

[0058] In order to support direct communication between terminals, a sidelink (SL) communication method is introduced. Ranging refers to determining the distance between two or more terminals, or the direction from one terminal to another, through a PC5 interface. A PC5 interface refers to a communication interface between terminals, such as a short-range direct communication interface between vehicles, people, and road infrastructure. Sidelink SL positioning refers to estimating the position of a located terminal based on the sidelink SL. For example, ranging or sidelink SL positioning can be performed on a located terminal (e.g., a target terminal (target user equipment, target UE)) based on information from a terminal (e.g., a positioning terminal (located user equipment, located UE)). The reference terminal can be, for example, an SL reference terminal whose position is known or can be known in ranging or sidelink SL positioning. For another example, the relative position information of a terminal (e.g., a target terminal (target user equipment, target UE)) and another terminal (e.g., an SL reference terminal (sidelink reference user equipment, sidelink reference UE)) can be determined through ranging or sidelink SL positioning.

[0059] Optionally, the target terminal is a terminal whose distance, direction and / or position is measured based on SL in ranging or SL service with the support of one or more SL reference terminals.

[0060] Optionally, the SL reference terminal is a terminal that supports positioning of a target terminal, for example, by using SL to send and / or receive reference signals for positioning, provide information related to positioning, etc.

[0061] Optionally, the positioning terminal is a SL reference terminal whose position is known or can be known using positioning based on the Uu interface. The positioning terminal can be used to determine the position of the target terminal using SL positioning.

[0062] Optionally, the SL positioning client terminal refers to a third-party terminal other than the SL reference terminal, target terminal, positioning terminal, etc., which initiates ranging or SL positioning service requests on behalf of the application resident thereon.

[0063] Optionally, in the SL positioning process involving the 5G core network (5G Core, 5GC), the position of the target terminal can be estimated with the help of the network by using the position of one or more positioning terminals, and the distance and / or direction between the target terminal and the positioning terminal, or the relative position, or distance and direction between the target terminal and one or more SL reference terminals, without limitation.

[0064] Optionally, the ranging / SL positioning results may include absolute position, relative position, distance, and direction, depending on the service requirements. If the target terminal decides to initiate the Sidelink Mobile Originated Location Request (SL-MO–LR) process, the target terminal may include information about one or more SL reference terminals and / or positioning terminals in the service request message.

[0065] Optionally, the Location Management Function (LMF) network element can pre-configure a list of candidate positioning terminals, including the capabilities, fix information, and location information of the positioning terminals. For example, this list represents positioning terminals deployed by a roadside unit (RSU) or an operator. The LMF network element can provide the candidate positioning terminal list to the target terminal.

[0066] Optionally, the target terminal may discover and select one or more positioning terminals for ranging / SL positioning services.

[0067] Optionally, multiple candidate positioning terminals may be found. In this case, a positioning terminal is selected from the candidate positioning terminal list. The selection of the positioning terminal is based on:

[0068] (1) List of candidate positioning terminals (if any).

[0069] (2) Capabilities of candidate positioning terminals, such as supported SL positioning methods.

[0070] (3) Determine the Quality of Service (QoS) requirements.

[0071] (4) Whether the PLMN of the candidate terminal serving the service is the same as the PLMN of the target terminal serving the service.

[0072] Optionally, when the LMF network element decides to perform SL positioning on the target terminal and triggers the discovery of a positioning terminal, the LMF network element can determine whether the LMF network element or the target terminal selects the positioning terminal. If the decision is for the LMF network element to select the positioning terminal, the target terminal sends the multiple discovered candidate positioning terminals to the LMF network element for selection. After determining the selected positioning terminal, the LMF network element sends the selected positioning terminal to the target terminal.

[0073] Optionally, terminal capabilities can be exchanged between terminals or between a terminal and an LMF network element via the Sidelink Positioning Protocol (SLPP). Terminal capabilities are exchanged via SLPP only after a direct link is established between the terminals, and therefore terminal selection is performed only after a direct link is established between the terminals. However, if no terminal is selected, for example, if the terminal pair does not match in capabilities (for example, the two terminals do not have the capability to support the same SL positioning method), there is no need to establish a link with the unselected terminal for the corresponding service.

[0074] Optionally, in some communication protocols, during the SL-MO-LR procedure or the Sidelink Mobile Terminated Location Request (SL-MT-LR) procedure, a PC5 link is established between a pair of terminals, and a terminal is selected based on the capabilities exchanged between the terminal and the LMF network element via SLPP. However, during the SL-MO-LR procedure or the SL-MT-LR procedure, terminal selection based on the exchanged information is not considered on the terminal side.

[0075] The embodiments of the present disclosure provide a terminal selection method that can be applied in business scenarios. For example, it can be applied in ranging or SL positioning scenarios. Of course, the method of the present disclosure can also be applied to any other possible business scenarios.

[0076] The “terminal selection” in the embodiments of the present disclosure may refer to, for example, selecting a terminal for the first time, or may refer to reselecting a terminal (ie, selecting a terminal again), and there is no limitation on this.

[0077] FIG2 is an interactive diagram of a terminal selection method according to an embodiment of the present disclosure. As shown in FIG2 , the present disclosure embodiment relates to a terminal selection method that can be used in a communication system 100. The method includes:

[0078] Step S2101: The first terminal sends second information.

[0079] In some embodiments, the second information may include: capabilities of the first terminal.

[0080] In some embodiments, the first terminal may be any one of a plurality of terminals, and the second information may be used to indicate the capability of the first terminal, where the capability of the first terminal refers to the capability for implementing a service. In other words, the capability of the first terminal is related to the service, where the service may be, for example, ranging or sidelink (SL) positioning service. The capability of the first terminal may be, for example, SL positioning capability, and the first terminal may specifically be, for example, the target terminal in the ranging or SL positioning service. Thus, the second terminal can effectively select the first terminal in the ranging or sidelink (SL) positioning service.

[0081] In some embodiments, the second terminal may be any one of a plurality of terminals. If the service is ranging or SL positioning service, the second terminal may be a positioning terminal in the ranging or SL positioning service, for example, and there is no limitation on this.

[0082] In some embodiments, the number of second terminals may be one or more. The first terminal may send the second information to one second terminal to indicate the capability of the first terminal, or the first terminal may send the second information to each second terminal to indicate the capability of the first terminal.

[0083] In some embodiments, the second information further includes at least one of the following: security information; service information; first terminal information, where the first terminal information is used to describe the first terminal; a destination layer 2 identifier, where the destination layer 2 identifier is used by the second terminal to receive the second information; and Ranging and Sidelink Positioning Protocol (RSPP) metadata information, where the RSPP metadata information includes the capabilities of the first terminal. This improves the comprehensiveness of the indication and effectively supports the second terminal in selecting the first terminal.

[0084] The information used to describe the first terminal may be referred to as first terminal information. In some embodiments, the first terminal information includes at least one of the following: a first terminal identifier, first terminal capabilities, and Ranging and Sidelink Positioning Protocol (RSPP) metadata information, wherein the RSPP metadata information includes the first terminal capabilities. This effectively improves the accuracy of the first terminal information indication.

[0085] In some embodiments, the capability of the first terminal may be carried by the first terminal information, for example, included in the first terminal information.

[0086] In some embodiments, the capabilities of the first terminal may be carried by RSPP metadata information, for example, included in RSPP metadata information, which in turn may be included in the first terminal information, or included in the second information. For example, each first terminal may have a corresponding RSPP metadata information, which includes the capabilities of the first terminal. Of course, the RSPP metadata information may also include any other possible information, without limitation.

[0087] In some embodiments, the destination layer 2 identifier refers to the layer 2 identifier (e.g., Layer-2 ID) of the peer terminal used to send the second information. The security information is used to support the security establishment process between the first terminal and the second terminal. The service information is, for example, the service type. There is no limitation on this.

[0088] In some embodiments, a first terminal may send a direct communication request message to a second terminal, wherein the direct communication request message includes second information and is used to request establishment of a link between the first terminal and the second terminal. This allows for the reuse of existing messages to indicate the capabilities of the first terminal, avoiding excessive indication overhead.

[0089] In some embodiments, the first terminal sends the second information, for example, during the link establishment process, or after the link is established, or during the capability exchange process after the link is established, without limitation.

[0090] In some embodiments, the first terminal sends second information, and the second information may include the capabilities of the first terminal. The second terminal may then determine whether to select the first terminal based on the capabilities of the first terminal. For example, the second terminal may determine whether the capabilities of the first terminal match those of the second terminal. If the capabilities of the first terminal match those of the second terminal, the first terminal may be selected; if the capabilities of the first terminal do not match those of the second terminal, the first terminal may not be selected.

[0091] Step S2102: The second terminal sends the first information according to the second information.

[0092] In some embodiments, the first information may include: the capability of the second terminal. The first information may be used to indicate the capability of the second terminal, and the capability of the second terminal refers to the capability for implementing the service. In other words, the capability of the second terminal may also be related to the service. The service may be, for example, ranging or sidelink (SL) positioning service. The capability of the second terminal may be, for example, SL positioning capability. The second terminal may specifically be, for example, a positioning terminal in the ranging or SL positioning service. Thus, it is possible to effectively support the first terminal in selecting the second terminal in the ranging or sidelink (SL) positioning service.

[0093] In some embodiments, the first information further includes: indication information, wherein the indication information is used to indicate the reason why the second terminal does not accept the request of the first terminal. That is, the first terminal can first indicate the capabilities of the first terminal (included in the second information) to the second terminal, and the second terminal can determine whether the capabilities of the first terminal and the second terminal match. If they do match, the capabilities of the second terminal can be fed back to the first terminal (for example, included in the first information). If they do not match, an indication information can be fed back to the first terminal to indicate the reason why the second terminal does not accept the request of the first terminal, wherein the request can be included in the second information sent by the first terminal. Thus, the first terminal can be notified of the reason for not accepting the request of the first terminal in a timely manner, and the first terminal can be effectively supported in selecting the second terminal.

[0094] In some embodiments, the first terminal may not initially indicate its capabilities to the second terminal, and the second terminal may not determine whether the capabilities of the first terminal and the second terminal match. Instead, the second terminal may provide feedback of its capabilities to the first terminal (e.g., included in the first information). This allows the first terminal to be promptly notified of the reason for rejecting the first terminal's request, effectively supporting the first terminal in selecting the second terminal.

[0095] In some embodiments, the first information further includes at least one of the following: second terminal information, wherein the second terminal information is used to describe the second terminal; RSPP metadata information, wherein the RSPP metadata information includes: capabilities of the second terminal.

[0096] The information used to describe the second terminal may be referred to as second terminal information. In some embodiments, the second terminal information includes at least one of the following: a second terminal identifier, second terminal capabilities, and Ranging and Sidelink Positioning Protocol (RSPP) metadata information, wherein the RSPP metadata information includes the second terminal capabilities. This effectively improves the accuracy of the second terminal information indication.

[0097] In some embodiments, the capability of the second terminal may be carried by the second terminal information, for example, included in the second terminal information.

[0098] In some embodiments, the capabilities of the second terminal may be carried by RSPP metadata information, for example, included in RSPP metadata information, which in turn may be included in the second terminal information, or included in the first information. For example, each second terminal may have a corresponding RSPP metadata information, which includes the capabilities of the second terminal. Of course, the RSPP metadata information may also include any other possible information, without limitation.

[0099] In some embodiments, the second terminal may receive the direct communication request message sent by the first terminal, and determine whether to accept the capability of the first terminal according to the second information included in the direct communication request message.

[0100] In some embodiments, the second terminal may determine whether the capabilities of the second terminal match those of the first terminal. If they match, the request of the first terminal is accepted. If they do not match, the request of the first terminal is not accepted, and the request may be included in the second information sent by the first terminal. The matching of the capabilities of the first terminal and the second terminal may refer to the overlapping of the capabilities of the first terminal and the second terminal, such as the ability to support the same SL positioning capability. The mismatch of the capabilities of the first terminal and the second terminal may refer to the non-overlapping of the capabilities of the first terminal and the second terminal, such as the inability to support the same SL positioning capability. Thus, the flexibility of the second terminal in determining whether to accept the capabilities of the first terminal can be effectively improved, and it can be effectively applied to personalized business scenarios.

[0101] In some embodiments, if the second terminal determines that the capabilities of the second terminal do not match the capabilities of the first terminal, the second terminal may send a direct communication rejection message, wherein the direct communication rejection message includes first information, and the indication information indicates the reason why the second terminal does not accept the request of the first terminal.

[0102] In some embodiments, if the second terminal determines that the capabilities of the second terminal match the capabilities of the first terminal, the second terminal may send a direct communication acceptance message, wherein the direct communication acceptance message includes first information, and the first information includes the capabilities of the second terminal.

[0103] In some embodiments, the second terminal may receive the second information after the link is established; or receive the second information during a capability exchange process after the link is established.

[0104] In some embodiments, a second terminal may receive a direct communication request message sent by a first terminal. The direct communication request message does not include the second information, and the second terminal does not need to determine whether the capabilities of the second terminal match those of the first terminal. The second terminal may send a direct communication acceptance message, where the direct communication acceptance message includes the first information, and the first information includes the capabilities of the second terminal. In some embodiments, the second terminal may send the first information during the link establishment process; or after the link is established, the second terminal may send the first information; or, during the capability exchange process after the link is established, the second terminal may receive the capability request sent by the first terminal and send the first information based on the capability request, where the first information includes the capabilities of the second terminal.

[0105] In some embodiments, if the first information is sent during the link establishment process, the first information may no longer be sent after the link is established.

[0106] Step S2103: The first terminal determines whether to select the second terminal based on the first information.

[0107] In some embodiments, the first terminal may receive the first information during the link establishment process; or receive the first information after the link is established; or receive the first information during the capability exchange process after the link is established.

[0108] In some embodiments, the first terminal may determine whether to select the second terminal based on the first information.

[0109] In some embodiments, the first terminal may determine whether to select the second terminal based on the capability of the second terminal in the first information. For example, the first terminal may also determine whether the capability of the second terminal matches the capability of the first terminal. If so, it is determined to select the second terminal; otherwise, it is determined not to select the second terminal. The capability of the first terminal matches the capability of the second terminal, which may refer to the overlapping parts of the capability of the first terminal and the capability of the second terminal, such as the ability to support the same SL positioning capability. The capability of the first terminal does not match the capability of the second terminal, which may refer to the non-overlapping parts of the capability of the first terminal and the capability of the second terminal, such as the inability to support the same SL positioning capability. Thus, the flexibility of the first terminal in determining whether to select the second terminal can be effectively improved, and it can be effectively applied to personalized business scenarios.

[0110] In some embodiments, the first terminal may also determine whether to select or not select the second terminal based on whether the first information contains indication information. For example, if the first information does not contain indication information, the selection of the second terminal may be determined based on whether the capabilities of the first terminal and the second terminal match. If the first information contains indication information, and the indication information indicates that the reason the second terminal did not accept the first terminal's request is that the capabilities of the first terminal and the second terminal do not match, the second terminal is determined not to be selected. This effectively improves the flexibility of the first terminal in determining whether to select the second terminal, effectively applicable to personalized business scenarios.

[0111] In some embodiments, a first terminal may receive a direct communication rejection message sent by a second terminal, where the direct communication rejection message includes first information, the first information including indication information, and the indication information is used to indicate the reason why the second terminal did not accept the first terminal's request. In other words, upon receiving the direct communication rejection message sent by the second terminal, the first terminal may determine the reason why the second terminal did not accept the first terminal's request based on the indication information carried therein. Optionally, the direct communication rejection message may also include the capabilities of the second terminal.

[0112] In some embodiments, a first terminal may receive a direct communication acceptance message sent by a second terminal, where the direct communication acceptance message includes first information, and the first information may include the capabilities of the second terminal. In other words, upon receiving the direct communication acceptance message sent by the second terminal, the first terminal may determine whether to select the second terminal based on the capabilities of the second terminal carried in the direct communication acceptance message.

[0113] That is to say, in the embodiment of the present disclosure, whether the capabilities of the first terminal match those of the second terminal can be determined on the first terminal side, or whether the capabilities of the first terminal match those of the second terminal can be determined on the second terminal side, without limitation.

[0114] In some embodiments, the first terminal may receive the first information after the link is established; or during the capability exchange process after the link is established, the first terminal may send a capability request, and then receive the first information including the capability of the second terminal in the capability provision based on the capability request by the second terminal.

[0115] In some embodiments, after determining to select the second terminal, a link between the first terminal and the second terminal may be established. In other words, if the capabilities of the first terminal match the capabilities of the second terminal, a link between the first terminal and the second terminal may be established. This link may be used to implement the service.

[0116] In some embodiments, after determining to select the second terminal, if it is determined that a link between the first terminal and the second terminal has been established, the link between the first terminal and the second terminal may be maintained. In other words, if the capabilities of the first terminal match the capabilities of the second terminal, the link between the first terminal and the second terminal may be maintained.

[0117] Therefore, when it is determined that the second terminal is selected, the link can be managed efficiently.

[0118] In some embodiments, after determining not to select the second terminal, the link between the first terminal and the second terminal may not be established.

[0119] In some embodiments, after determining not to select the second terminal, if it is determined that the link between the first terminal and the second terminal has been established, the link between the first terminal and the second terminal may be released.

[0120] In some embodiments, after determining not to select the second terminal, if it is determined that the link between the first terminal and the second terminal has been established, the link between the first terminal and the second terminal may be modified.

[0121] Thus, when it is determined that the second terminal is not to be selected, the link can be managed efficiently.

[0122] The terminal selection method involved in the embodiments of the present disclosure may include at least one of steps S2101 to S2103. For example, step S2101 can be implemented as an independent embodiment, step S2102 can be implemented as an independent embodiment, and so on, but are not limited thereto. Steps S2101+S2102 can be implemented as independent embodiments, and steps S2101+S2102+S2103 can be implemented as independent embodiments, but are not limited thereto.

[0123] In this embodiment or example, unless there is any contradiction, each step can be independent, arbitrarily combined or exchanged in order, the optional methods or optional examples can be arbitrarily combined, and can be arbitrarily combined with any steps of other embodiments or other examples.

[0124] In this embodiment, the first terminal sends the second information, the second terminal sends the first information based on the second information, and the first terminal determines whether to select the second terminal based on the first information, which can effectively support terminal selection based on the exchanged information on the terminal side.

[0125] FIG3A is an interactive diagram of a terminal selection method according to another embodiment of the present disclosure. As shown in FIG3A , the present disclosure embodiment relates to a terminal selection method that can be used for a first terminal. The method includes:

[0126] Step S3101, receiving first information.

[0127] Step S3102: Determine whether to select the second terminal according to the first information.

[0128] The terminal selection method involved in the embodiments of the present disclosure may include at least one of steps S3101 and S3102. For example, step S3101 can be implemented as an independent embodiment, step S3102 can be implemented as an independent embodiment, and so on, but the present invention is not limited thereto. Steps S3101 and S3102 can be implemented as independent embodiments, but the present invention is not limited thereto.

[0129] In this embodiment or example, unless there is any contradiction, each step can be independent, arbitrarily combined or exchanged in order, the optional methods or optional examples can be arbitrarily combined, and can be arbitrarily combined with any steps of other embodiments or other examples.

[0130] FIG3B is an interactive diagram of a terminal selection method according to another embodiment of the present disclosure. As shown in FIG3B , the present disclosure embodiment relates to a terminal selection method that can be used for a first terminal. The method includes:

[0131] Step S3201: Send second information, where the second information at least includes: capabilities of the first terminal.

[0132] Step S3202: Receive first information, where the first information further includes indication information, where the indication information is used to indicate the reason why the second terminal does not accept the request of the first terminal.

[0133] Step S3203: Determine whether to select the second terminal according to the instruction information in the first information.

[0134] The terminal selection method involved in the embodiments of the present disclosure may include at least one of steps S3201 to S3203. For example, step S3201 can be implemented as an independent embodiment, step S3202 can be implemented as an independent embodiment, and so on, but the present invention is not limited thereto. Steps S3201+S3202 can be implemented as independent embodiments, but the present invention is not limited thereto.

[0135] In this embodiment or example, unless there is any contradiction, each step can be independent, arbitrarily combined or exchanged in order, the optional methods or optional examples can be arbitrarily combined, and can be arbitrarily combined with any steps of other embodiments or other examples.

[0136] FIG3C is an interactive diagram of a terminal selection method according to another embodiment of the present disclosure. As shown in FIG3C , the present disclosure embodiment relates to a terminal selection method that can be used for a first terminal. The method includes:

[0137] Step S3301: Receive first information, where the first information includes: capabilities of the second terminal.

[0138] Step S3302: The capability of the first terminal matches the capability of the second terminal, and the second terminal is selected.

[0139] Step S3303: The capability of the first terminal does not match the capability of the second terminal, and it is determined that the second terminal is not selected.

[0140] The terminal selection method involved in the embodiments of the present disclosure may include at least one of steps S3301 to S3303. For example, step S3301 can be implemented as an independent embodiment, step S3302 can be implemented as an independent embodiment, and so on, but the present invention is not limited thereto. Steps S3301+S3302 can be implemented as independent embodiments, but the present invention is not limited thereto.

[0141] In this embodiment or example, unless there is any contradiction, each step can be independent, arbitrarily combined or exchanged in order, the optional methods or optional examples can be arbitrarily combined, and can be arbitrarily combined with any steps of other embodiments or other examples.

[0142] FIG3D is an interactive diagram illustrating a terminal selection method according to another embodiment of the present disclosure. As shown in FIG3D , the present disclosure embodiment relates to a terminal selection method that can be used for a first terminal. The method includes:

[0143] Step S3401, receiving first information.

[0144] Step S3402: The first information includes indication information, where the indication information indicates that the reason why the second terminal does not accept the request of the first terminal is that the capability of the first terminal does not match the capability of the second terminal, and it is determined that the second terminal is not selected.

[0145] Step S3403: The first information does not include indication information, the capability of the first terminal matches the capability of the second terminal, and the second terminal is determined to be selected.

[0146] Step S3404: The first information does not include indication information, the capability of the first terminal does not match the capability of the second terminal, and it is determined not to select the second terminal.

[0147] The terminal selection method involved in the embodiments of the present disclosure may include at least one of steps S3401 to S3404. For example, step S3401 can be implemented as an independent embodiment, step S3402 can be implemented as an independent embodiment, and so on, but are not limited thereto. Steps S3401+S3402 can be implemented as independent embodiments, but are not limited thereto.

[0148] In this embodiment or example, unless there is any contradiction, each step can be independent, arbitrarily combined or exchanged in order, the optional methods or optional examples can be arbitrarily combined, and can be arbitrarily combined with any steps of other embodiments or other examples.

[0149] FIG4A is an interactive diagram of a terminal selection method according to another embodiment of the present disclosure. As shown in FIG4A , the present disclosure embodiment relates to a terminal selection method that can be used for a second terminal. The method includes:

[0150] Step S4101: Send first information, where the first information is used by the first terminal to determine whether to select the second terminal.

[0151] The terminal selection method involved in the embodiment of the present disclosure may include step S4101. For example, step S4101 may be implemented as an independent embodiment, but is not limited thereto.

[0152] In this embodiment or example, unless there is any contradiction, each step can be independent, arbitrarily combined or exchanged in order, the optional methods or optional examples can be arbitrarily combined, and can be arbitrarily combined with any steps of other embodiments or other examples.

[0153] FIG4B is an interactive diagram of a terminal selection method according to another embodiment of the present disclosure. As shown in FIG4B , the present disclosure embodiment relates to a terminal selection method that can be used for a second terminal. The method includes:

[0154] Step S4201: Receive second information, where the second information at least includes: capabilities of the first terminal.

[0155] Step S4202: Determine whether to select the first terminal based on the second information.

[0156] Step S4203: Send first information, where the first information is used by the first terminal to determine whether to select the second terminal.

[0157] The terminal selection method involved in the embodiments of the present disclosure may include at least one of steps S4201 to S4203. For example, step S4201 can be implemented as an independent embodiment, step S4202 can be implemented as an independent embodiment, and so on, but the present disclosure is not limited thereto. Steps S4201+S4202 can be implemented as independent embodiments, but the present disclosure is not limited thereto.

[0158] In this embodiment or example, unless there is any contradiction, each step can be independent, arbitrarily combined or exchanged in order, the optional methods or optional examples can be arbitrarily combined, and can be arbitrarily combined with any steps of other embodiments or other examples.

[0159] FIG4C is an interactive diagram of a terminal selection method according to another embodiment of the present disclosure. As shown in FIG4C , the present disclosure embodiment relates to a terminal selection method that can be used for a second terminal. The method includes:

[0160] Step S4301: Receive second information, where the second information at least includes: capabilities of the first terminal.

[0161] Step S4302: The capability of the first terminal matches the capability of the second terminal, and the first terminal is selected.

[0162] Step S4303: Send first information, where the first information includes: capabilities of the second terminal; and the second terminal accepts the request of the first terminal included in the second information.

[0163] Step S4304: The capability of the first terminal does not match the capability of the second terminal, and it is determined that the first terminal is not selected.

[0164] Step S4305: Send first information, where the first information includes: indication information, and the indication information is used to indicate the reason why the second terminal does not accept the request of the first terminal.

[0165] The terminal selection method involved in the embodiments of the present disclosure may include at least one of steps S4301 to S4305. For example, step S4301 can be implemented as an independent embodiment, step S4302 can be implemented as an independent embodiment, and so on, but the present invention is not limited thereto. Steps S4301+S4302 can be implemented as independent embodiments, but the present invention is not limited thereto.

[0166] In this embodiment or example, unless there is any contradiction, each step can be independent, arbitrarily combined or exchanged in order, the optional methods or optional examples can be arbitrarily combined, and can be arbitrarily combined with any steps of other embodiments or other examples.

[0167] FIG5 is an interactive diagram of a terminal selection method according to another embodiment of the present disclosure. As shown in FIG5, the present disclosure embodiment relates to a terminal selection method that can be used in a communication system. The communication system includes a first terminal and a second terminal, and the method includes:

[0168] Step S5101: The second terminal sends first information.

[0169] Step S5102: The first terminal receives the first information and determines whether to select the second terminal based on the first information.

[0170] The terminal selection method involved in the embodiments of the present disclosure may include at least one of steps S5101 and S5102. For example, step S5101 can be implemented as an independent embodiment, step S5102 can be implemented as an independent embodiment, and so on, but the present invention is not limited thereto. Steps S5101 and S5102 can be implemented as independent embodiments, but the present invention is not limited thereto.

[0171] In this embodiment or example, unless there is any contradiction, each step can be independent, arbitrarily combined or exchanged in order, the optional methods or optional examples can be arbitrarily combined, and can be arbitrarily combined with any steps of other embodiments or other examples.

[0172] The embodiments of the present disclosure provide a terminal selection method that supports selecting or reselecting terminals for ranging / SL positioning services based on terminal capabilities, and can also perform appropriate link management on selected terminals and unselected terminals.

[0173] The embodiments of the present disclosure provide a method for supporting selection or reselection of a terminal for ranging / SL positioning services by considering the capabilities of the terminal, including:

[0174] During direct communication, the target terminal receives the terminal capabilities included in the link establishment rejection message or the link establishment acceptance message. Alternatively, capabilities may be exchanged over an established link.

[0175] The target terminal selects or reselects a terminal taking into account the capabilities of the terminal.

[0176] Release or modify the link between the target terminal and the unselected terminals.

[0177] In the SL-MT-LR process, when the capabilities of the terminal are available, the LMF network element can select or reselect the terminal considering the capabilities of the terminal.

[0178] The following is an exemplary introduction to the above method.

[0179] Optional embodiment:

[0180] As shown in Figure 6, Figure 6 shows a schematic diagram of the process of selecting or reselecting a terminal considering the terminal's capabilities. In Figure 6, the terminal inspection process is shown when performing proximity services (ProSe) direct communication through the PC5 interface. For example, in response to the UE's network (NW) or application layer service request, the target terminal is triggered to establish a PC5 link with the relevant terminal, and the absolute position of the target terminal (Target UE) is requested with the help of positioning terminals near the target terminal (including positioning UE1 (Located UE1), positioning UE2 (Located UE2) and positioning UE3 (Located UE3)). Target UE, Located UE1, Located UE2 and Located UE2 all support ranging / SL positioning services.

[0181] 1. The ranging / SL positioning service is triggered by the UE's application layer or NW.

[0182] 2. Send a direct communication request message (including the terminal's capabilities).

[0183] In some embodiments, the direct communication request message may be, for example, a Direct Communication Request message.

[0184] In some embodiments, the target terminal sends a direct communication request message to initiate a unicast layer 2 link establishment process with positioning UE1, positioning UE2, and positioning UE3. The direct communication request message includes:

[0185] Source user information: the application layer ID of the initiating terminal (ie, the application layer ID of the Target UE) and / or the capabilities of the source terminal. The capabilities of the terminal are the SL positioning methods supported by the terminal.

[0186] RSPP metadata: metadata of the initiating terminal, including, for example, the SL positioning methods supported by the terminal.

[0187] Target terminal information: Set the application layer ID of the target terminal (for example, the application layer ID of the positioning UE) to the application layer ID of the Target UE.

[0188] Proximity Service (ProSe) information: information related to the ProSe identity for requesting to establish a layer 2 link.

[0189] Security information: Information used for security establishment.

[0190] 2a. Consider the terminal's capabilities and decide whether to accept the direct communication request message.

[0191] 2b. Consider the terminal's capabilities and decide whether to accept the direct communication request message.

[0192] 2c. Consider the terminal's capabilities and decide whether to accept the direct communication request message.

[0193] In some embodiments, after receiving the direct communication request message, the positioning UE determines whether to accept the direct communication request message based on the capability of the source terminal included in the RSPP metadata or the source user information in the direct communication request message.

[0194] For example, in this embodiment, the target terminal, which is the initiating terminal of the unicast layer two-link establishment process, can include the capabilities of its terminal in the direct communication request message, and the opposite terminal of the unicast layer two-link establishment process, such as positioning UE1, positioning UE2 or positioning UE3, checks whether the capabilities of the initiating terminal match the capabilities of this terminal. For example, whether the terminal pair has overlap in terminal capabilities (for example, whether the terminal pair supports the same SL positioning method). According to the inspection results, the positioning UE may reject the direct communication request message, in which case step 3 (for example, Located UE2) can be executed, and the positioning UE may also accept the direct communication request message (for example, Located UE1 and Located UE3), in which case steps 4a or 4b-5 can be executed.

[0195] 3. Send direct communication rejection message (reason).

[0196] In some embodiments, the positioning UE may send a direct communication rejection message to the initiating terminal. The direct communication rejection message may include a reason, indicating a capability mismatch between the terminal pair (the target terminal and the positioning terminal). Optionally, the direct communication rejection message may also include the SL positioning method supported by the terminal.

[0197] 4a. Security establishment process.

[0198] 4b. Security Establishment Process.

[0199] In some embodiments, a security establishment process is performed between the target terminal and positioning UE1 or positioning UE3.

[0200] 5. Send direct communication acceptance message (including terminal capabilities).

[0201] In some embodiments, the positioning terminal that has successfully established a security relationship with the target terminal sends a direct communication acceptance message to the target terminal.

[0202] In some embodiments, the direct communication acceptance message may include:

[0203] Source user information: the application layer ID of the terminal that sends the direct communication acceptance message and / or the capabilities of the source terminal. The capabilities of the terminal, i.e., the SL positioning methods supported by the terminal.

[0204] Quality of Service (QoS) information: PC5 QoS Flow information.

[0205] Optionally, PC5QoS rules.

[0206] Optionally, RSPP metadata: metadata of Located UE1 or Located UE3, for example, including the SL positioning method supported by the terminal.

[0207] If Internet Protocol (IP) communication is used:

[0208] IP address configuration: For IP communication, the IP address configuration value required by the link.

[0209] Link-local IPv6 address: If the target terminal does not support the IPv6 address allocation mechanism (that is, if "IP Address Configuration" is set to "Not Supporting IPv6 Address Allocation"), a link-local IPv6 address is generated locally. Furthermore, if the target terminal includes a link-local IPv6 address in the Direct Communication Request message, the link-local IPv6 address generated locally by the positioning UE will not conflict with the link-local IPv6 address included in the Direct Communication Request message.

[0210] 6a. Consider the terminal's capabilities and select or reselect the terminal.

[0211] In some embodiments, the target terminal selects or reselects a terminal based on the available terminal capabilities of the connected terminal. For example, the terminal capabilities of the positioning terminal UE2 are indicated by the reason value of the direct communication rejection message in step 3 and / or the terminal capabilities, i.e., the supported SL positioning methods, and the terminal capabilities of the positioning terminals UE1 and UE3 are indicated by the direct communication acceptance message in step 5.

[0212] 6b. Considering the capabilities of the terminals, release the link between the Target UE and the Located UE1.

[0213] In some embodiments, links with terminals that were not selected based on the capabilities of the terminals may be released.

[0214] 7. Exchange capability.

[0215] In some embodiments, if the capabilities of the relevant terminal are not available, SLPP may be used to exchange ranging / SL positioning capabilities between the target terminal and the positioning terminal.

[0216] 7a. Consider the capabilities of the terminal and select or reselect the terminal.

[0217] In some embodiments, if the terminal's capabilities are received in the ranging / SL positioning capability exchange between the target terminal and the positioning terminal in step 7, the target terminal may select or reselect a terminal based on the terminal's capabilities.

[0218] 7b. Considering the capabilities of the terminals, modify or release the link between the Target UE and the Located UE1.

[0219] In some embodiments, links with terminals that were not selected based on the capabilities of the terminals may be released or modified.

[0220] 8. Interact with NW and selected UE.

[0221] In some embodiments, the target terminal interacts with the NW and the discovered or selected terminal to perform the steps in the SL positioning service process. In the case of the SL-MO-LR process, when the terminal capabilities are available in the LMF network element, the LMF network element may consider the terminal capabilities to select the terminal. In the case of the SL-MT-LR process, when the terminal capabilities are available in the LMF network element, the LMF network element may also consider the terminal capabilities to select the terminal.

[0222] In the disclosed embodiments, while supporting terminal communication via PC5 for ranging / SL positioning, the terminal's capabilities are considered to select or reselect the terminal. Furthermore, links with unselected terminals may not be managed (e.g., links may be released or QoS flows may be deleted), while links with selected terminals required for the service may be effectively managed.

[0223] FIG7A is a schematic diagram of the structure of a terminal proposed in an embodiment of the present disclosure. As shown in FIG7A , the terminal 7100 may include: at least one of a transceiver module 7101 and a processing module 7102. The terminal 7100 may include:

[0224] The transceiver module 7101 is configured to receive first information.

[0225] The processing module 7102 is configured to determine whether to select the second terminal according to the first information.

[0226] In some embodiments of the present disclosure, the transceiver module 7101 is configured to:

[0227] Second information is sent, where the second information at least includes: capabilities of the first terminal.

[0228] In some embodiments of the present disclosure, the first information includes at least one of the following:

[0229] The capabilities of the second terminal;

[0230] Indication information, where the indication information is used to indicate the reason why the second terminal does not accept the request of the first terminal, and the request is included in the second information sent by the first terminal.

[0231] In some embodiments of the present disclosure, the second information further includes at least one of the following:

[0232] safety information;

[0233] business information;

[0234] First terminal information, wherein the first terminal information is used to describe the first terminal;

[0235] a destination layer 2 identifier, wherein the destination layer 2 identifier is used by the second terminal to receive the second information;

[0236] Ranging and Sidelink Positioning Protocol RSPP metadata information, wherein the RSPP metadata information includes: capabilities of the first terminal.

[0237] In some embodiments of the present disclosure, the processing module 7102 is specifically configured to:

[0238] The indication information indicates that the reason why the second terminal does not accept the request of the first terminal is that the capability of the first terminal does not match the capability of the second terminal, and it is determined not to select the second terminal.

[0239] In some embodiments of the present disclosure, the first information includes at least one of the following:

[0240] Second terminal information, where the second terminal information is used to describe the second terminal;

[0241] RSPP metadata information, wherein the RSPP metadata information includes: capabilities of the second terminal.

[0242] In some embodiments of the present disclosure, the processing module 7102 is specifically configured to perform any of the following:

[0243] The capability of the first terminal matches the capability of the second terminal, and the second terminal is selected;

[0244] The capability of the first terminal does not match the capability of the second terminal, and it is determined that the second terminal is not selected.

[0245] In some embodiments of the present disclosure, after determining to select the second terminal, the processing module 7102 is specifically configured to:

[0246] A link between the first terminal and the second terminal is established, or a link between the first terminal and the second terminal is maintained.

[0247] In some embodiments of the present disclosure, after determining not to select the second terminal, the processing module 7102 is specifically configured to:

[0248] The link between the first terminal and the second terminal is not established, or the link between the first terminal and the second terminal is released, or the link between the first terminal and the second terminal is modified.

[0249] In some embodiments of the present disclosure, the transceiver module 7101 is specifically configured to:

[0250] A direct communication request message is sent, where the direct communication request message includes second information and is used to request establishment of a link between the first terminal and the second terminal.

[0251] In some embodiments of the present disclosure, the transceiver module 7101 is specifically configured to:

[0252] A direct communication rejection message is received, wherein the direct communication rejection message includes first information, the first information includes indication information, and the indication information is used to indicate a reason why the second terminal does not accept the request of the first terminal.

[0253] In some embodiments of the present disclosure, the transceiver module 7101 is specifically configured to:

[0254] A direct communication acceptance message is received, wherein the direct communication acceptance message includes first information, and the first information includes a capability of the second terminal.

[0255] In some embodiments of the present disclosure, the transceiver module 7101 is specifically configured to perform any of the following:

[0256] After the link is established, receiving first information;

[0257] During a capability exchange process after a link is established, first information is received.

[0258] In some embodiments of the present disclosure, the transceiver module 7101 is specifically configured to perform any of the following:

[0259] After the link is established, sending second information;

[0260] The second information is sent during the capability exchange process after the link is established.

[0261] In some embodiments of the present disclosure, the capability of the first terminal or the capability of the second terminal is related to a service, and the service is a ranging or sidelink (SL) positioning service.

[0262] In some embodiments of the present disclosure, the capability of the first terminal is a positioning method supported by the first terminal, and the capability of the second terminal is a positioning method supported by the second terminal.

[0263] FIG7B is a schematic diagram of the structure of a terminal proposed in another embodiment of the present disclosure. As shown in FIG7B , the terminal 7200 may include: at least one of a transceiver module 7201 and a processing module 7202. The terminal 7200 may include:

[0264] The transceiver module 7201 is configured to send first information, where the first information is used by the first terminal to determine whether to select the second terminal.

[0265] In some embodiments of the present disclosure, the transceiver module 7201 is specifically configured to:

[0266] Second information is received, where the second information at least includes: capabilities of the first terminal.

[0267] The processing module 7202 is configured to determine whether to select the first terminal according to the second information.

[0268] In some embodiments of the present disclosure, the first information includes at least one of the following:

[0269] The capabilities of the second terminal;

[0270] Indication information, where the indication information is used to indicate the reason why the second terminal does not accept the request of the first terminal, and the request is included in the second information sent by the first terminal.

[0271] In some embodiments of the present disclosure, the second information further includes at least one of the following:

[0272] safety information;

[0273] business information;

[0274] First terminal information, wherein the first terminal information is used to describe the first terminal;

[0275] a destination layer 2 identifier, wherein the destination layer 2 identifier is used by the second terminal to receive the second information;

[0276] Ranging and Sidelink Positioning Protocol RSPP metadata information, wherein the RSPP metadata information includes: capabilities of the first terminal.

[0277] In some embodiments of the present disclosure, the processing module 7202 is configured to perform any of the following:

[0278] The capability of the first terminal matches the capability of the second terminal, and the first terminal is selected;

[0279] The capability of the first terminal does not match the capability of the second terminal, and it is determined that the first terminal is not selected.

[0280] In some embodiments of the present disclosure, the transceiver module 7201 is specifically configured to perform any of the following:

[0281] Sending first information, wherein the first information includes: capabilities of the second terminal; the second terminal accepting the request of the first terminal included in the second information;

[0282] The first information is sent, wherein the first information includes indication information, and the indication information is used to indicate the reason why the second terminal does not accept the request of the first terminal.

[0283] In some embodiments of the present disclosure, the first information further includes at least one of the following:

[0284] Second terminal information, where the second terminal information is used to describe the second terminal;

[0285] RSPP metadata information, wherein the RSPP metadata information includes: capabilities of the second terminal.

[0286] In some embodiments of the present disclosure, after determining to select the second terminal, the processing module 7202 is further configured to:

[0287] A link between the first terminal and the second terminal is established, or a link between the first terminal and the second terminal is maintained.

[0288] In some embodiments of the present disclosure, after determining not to select the second terminal, the processing module 7202 is further configured to:

[0289] The link between the first terminal and the second terminal is not established, or the link between the first terminal and the second terminal is released, or the link between the first terminal and the second terminal is modified.

[0290] In some embodiments of the present disclosure, the transceiver module 7201 is specifically configured to:

[0291] A direct communication request message is received, where the direct communication request message includes second information and is used to request establishment of a link between the first terminal and the second terminal.

[0292] In some embodiments of the present disclosure, the transceiver module 7201 is specifically configured to:

[0293] A direct communication rejection message is sent, wherein the direct communication rejection message includes first information, the first information includes indication information, and the indication information is used to indicate the reason why the second terminal does not accept the request of the first terminal.

[0294] In some embodiments of the present disclosure, the transceiver module 7201 is specifically configured to:

[0295] A direct communication acceptance message is sent, wherein the direct communication acceptance message includes first information, and the first information includes the capability of the second terminal.

[0296] In some embodiments of the present disclosure, the transceiver module 7201 is specifically configured to perform any of the following:

[0297] After the link is established, sending first information;

[0298] During the capability exchange process after the link is established, the first information is sent.

[0299] In some embodiments of the present disclosure, the transceiver module 7201 is specifically configured to perform any of the following:

[0300] After the link is established, receiving second information;

[0301] During a capability exchange process after the link is established, second information is received.

[0302] In some embodiments of the present disclosure, the capability of the first terminal or the capability of the second terminal is related to a service, and the service is a ranging or sidelink (SL) positioning service.

[0303] In some embodiments of the present disclosure, the capability of the first terminal is a positioning method supported by the first terminal, and the capability of the second terminal is a positioning method supported by the second terminal.

[0304] In some embodiments, the transceiver module may include a transmitting module and / or a receiving module, and the transmitting module and the receiving module may be separate or integrated. Optionally, the transceiver module may be interchangeable with the transceiver.

[0305] In some embodiments, the processing module can be a single module or can include multiple submodules. Optionally, the multiple submodules each execute all or part of the steps required to be executed by the processing module. Optionally, the processing module can be interchangeable with the processor.

[0306] It should be understood that the division of the various units or modules in the above device is merely a division of logical functions. In actual implementation, they may be fully or partially integrated into a physical entity, or they may be physically separated. In addition, the units or modules in the device may be implemented in the form of a processor calling software: for example, the device includes a processor, the processor is connected to a memory, and the memory stores instructions. The processor calls the instructions stored in the memory to implement any of the above methods or implement the functions of the various units or modules of the above device, wherein the processor is, for example, a general-purpose processor, such as a central processing unit (CPU) or a microprocessor, and the memory is a memory within the device or a memory outside the device. Alternatively, the units or modules in the device can be implemented in the form of hardware circuits, and the functions of some or all of the units or modules can be realized by designing the hardware circuits. The above-mentioned hardware circuits can be understood as one or more processors; for example, in one implementation, the above-mentioned hardware circuit is an application-specific integrated circuit (ASIC), which realizes the functions of some or all of the above units or modules by designing the logical relationship of the components in the circuit; for example, in another implementation, the above-mentioned hardware circuit can be realized by a programmable logic device (PLD). Taking a field programmable gate array (FPGA) as an example, it can include a large number of logic gate circuits, and the connection relationship between the logic gate circuits is configured by configuring the configuration file, thereby realizing the functions of some or all of the above units or modules. All units or modules of the above devices can be realized in the form of software called by the processor, or in the form of hardware circuits, or in part by the form of software called by the processor, and the rest by hardware circuits.

[0307] In the embodiment of the present disclosure, the processor is a circuit with signal processing capability. In one implementation, the processor can be a circuit with instruction reading and execution capability, such as a central processing unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a microprocessor), or a digital signal processor (DSP); in another implementation, the processor can implement certain functions through the logical relationship of the hardware circuit, and the logical relationship of the above hardware circuit is fixed or reconfigurable, such as a hardware circuit implemented by a processor as an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In a reconfigurable hardware circuit, the process of the processor loading a configuration document and implementing the hardware circuit configuration can be understood as the process of the processor loading instructions to implement the functions of some or all of the above units or modules. In addition, it can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a neural network processing unit (NPU), a tensor processing unit (TPU), a deep learning processing unit (DPU), etc.

[0308] Figure 8A is a schematic diagram of the structure of a communication device proposed in an embodiment of the present disclosure. Communication device 8100 can be a terminal, a network device, a chip, a chip system, or a processor that supports a terminal implementing any of the above methods, or a chip, a chip system, or a processor that supports a network device implementing any of the above methods. Communication device 8100 can be used to implement the methods described in the above method embodiments. For details, please refer to the description of the above method embodiments.

[0309] As shown in Figure 8A, the communication device 8100 includes one or more processors 8101. The processor 8101 can be a general-purpose processor or a dedicated processor, for example, a baseband processor or a central processing unit. The baseband processor can be used to process communication protocols and communication data, and the central processing unit can be used to control the communication device (such as a base station, a baseband chip, a terminal device, a terminal device chip, a DU or a CU, etc.), execute programs, and process program data. The communication device 8100 is used to perform any of the above methods.

[0310] In some embodiments, the communication device 8100 further includes one or more memories 8102 for storing instructions. Optionally, all or part of the memories 8102 may be located outside the communication device 8100.

[0311] In some embodiments, the communication device 8100 further includes one or more transceivers 8103. When the communication device 8100 includes one or more transceivers 8103, the transceiver 8103 performs at least one of the communication steps such as sending and / or receiving in the above method, and the processor 8101 performs the other steps.

[0312] In some embodiments, a transceiver may include a receiver and / or a transmitter. The receiver and transmitter may be separate or integrated. Optionally, the terms transceiver, transceiver unit, transceiver, and transceiver circuit may be used interchangeably; the terms transmitter, transmitting unit, transmitter, and transmitting circuit may be used interchangeably; and the terms receiver, receiving unit, receiver, and receiving circuit may be used interchangeably.

[0313] In some embodiments, the communication device 8100 may include one or more interface circuits 8104. Optionally, the interface circuit 8104 is connected to the memory 8102. The interface circuit 8104 may be configured to receive signals from the memory 8102 or other devices, and may be configured to send signals to the memory 8102 or other devices. For example, the interface circuit 8104 may read instructions stored in the memory 8102 and send the instructions to the processor 8101.

[0314] The communication device 8100 described in the above embodiments may be a terminal, a network device, or a third entity, but the scope of the communication device 8100 described in the present disclosure is not limited thereto, and the structure of the communication device 8100 may not be limited by FIG. 8A. The communication device may be an independent device or may be part of a larger device. For example, the communication device may be: 1) an independent integrated circuit IC, or a chip, or a chip system or subsystem; (2) a collection of one or more ICs, optionally, the above IC collection may also include a storage component for storing data or programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, a terminal device, an intelligent terminal device, a cellular phone, a wireless device, a handheld device, a mobile unit, an in-vehicle device, a network device, a cloud device, an artificial intelligence device, etc.; (6) others, etc.

[0315] FIG8B is a schematic diagram of the structure of a chip proposed in an embodiment of the present disclosure. If the communication device 8100 can be a chip or a chip system, please refer to the schematic diagram of the structure of the chip 8200 shown in FIG8B , but the present disclosure is not limited thereto.

[0316] The chip 8200 includes one or more processors 8201 , and the chip 8200 is configured to execute any of the above methods.

[0317] In some embodiments, the chip 8200 further includes one or more interface circuits 8202. Optionally, the interface circuit 8202 is connected to the memory 8203. The interface circuit 8202 can be used to receive signals from the memory 8203 or other devices, and can be used to send signals to the memory 8203 or other devices. For example, the interface circuit 8202 can read instructions stored in the memory 8203 and send the instructions to the processor 8201.

[0318] In some embodiments, the interface circuit 8202 performs at least one of the communication steps such as sending and / or receiving in the above method, and the processor 8201 performs the other steps.

[0319] In some embodiments, terms such as interface circuit, interface, transceiver pin, and transceiver may be used interchangeably.

[0320] In some embodiments, the chip 8200 further includes one or more memories 8203 for storing instructions. Alternatively, all or part of the memories 8203 may be outside the chip 8200.

[0321] The present disclosure also proposes a storage medium having instructions stored thereon, which, when executed on the communication device 8100, causes the communication device 8100 to execute any of the above methods. Optionally, the storage medium is an electronic storage medium. Optionally, the storage medium is a computer-readable storage medium, but is not limited thereto, and may also be a storage medium readable by other devices. Optionally, the storage medium may be a non-transitory storage medium, but is not limited thereto, and may also be a temporary storage medium.

[0322] The present disclosure also provides a program product, which, when executed by the communication device 8100, enables the communication device 8100 to perform any of the above methods. Optionally, the program product is a computer program product.

[0323] The present disclosure also proposes a computer program, which, when executed on a computer, causes the computer to perform any one of the above methods.

[0324] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented using software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer programs. When the computer program is loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present disclosure are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer program can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer program can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that includes one or more available media integrated therein. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a high-density digital video disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0325] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this disclosure.

[0326] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0327] The above description is merely a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A terminal selection method, characterized in that, Executed by a first terminal, the method includes: Receiving first information; Determining whether to select a second terminal according to the first information.

2. The method according to claim 1, wherein The method further includes: Sending second information, where the second information at least includes: the capabilities of the first terminal.

3. The method according to any one of claims 1-2, characterized in that, The first information includes at least one of the following: The capabilities of the second terminal; Indication information, where the indication information is used to indicate the reason why the second terminal does not accept the request of the first terminal, and the request is included in the second information sent by the first terminal.

4. The method according to any one of claims 2-3, characterized in that, The second information further includes at least one of the following: Security information; Service information; First terminal information, where the first terminal information is used to describe the first terminal; Destination layer 2 identifier, where the destination layer 2 identifier is used for the second terminal to receive the second information; Range and sidelink positioning protocol (RSPP) metadata information, where the RSPP metadata information includes: the capabilities of the first terminal.

5. The method according to any one of claims 2-4, characterized in that, Determining whether to select the second terminal according to the indication information in the first information includes: If the indication information indicates that the reason why the second terminal does not accept the request of the first terminal is that the capabilities of the first terminal do not match the capabilities of the second terminal, determining not to select the second terminal.

6. The method according to any one of claims 1-5, characterized in that, The first information includes at least one of the following: Second terminal information, where the second terminal information is used to describe the second terminal; RSPP metadata information, where the RSPP metadata information includes: the capabilities of the second terminal.

7. The method according to any one of claims 1-6, characterized in that, Determining whether to select a second terminal according to the capabilities of the second terminal in the first information includes any of the following: If the capabilities of the first terminal match the capabilities of the second terminal, determining to select the second terminal; If the capabilities of the first terminal do not match the capabilities of the second terminal, determining not to select the second terminal.

8. The method according to any one of claims 1 to 7, characterized in that, After determining to select the second terminal, the method further includes: Establishing a link between the first terminal and the second terminal, or maintaining the link between the first terminal and the second terminal.

9. The method according to any one of claims 1 to 7, characterized in that After determining not to select the second terminal, the method further includes: Not establishing a link between the first terminal and the second terminal, or releasing the link between the first terminal and the second terminal, or modifying the link between the first terminal and the second terminal.

10. The method according to any one of claims 2-9, characterized in that, The sending of the second information includes: Sending a direct communication request message, where the direct communication request message includes the second information, and the direct communication request message is used to request the establishment of a link between the first terminal and the second terminal.

11. The method according to claim 10, characterized in that, The receiving of the first information includes: Receiving a direct communication rejection message, where the direct communication rejection message includes the first information, and the first information includes indication information, and the indication information is used to indicate the reason why the second terminal does not accept the request of the first terminal.

12. The method according to claim 10, wherein The receiving of the first information includes: Receiving a direct communication acceptance message, where the direct communication acceptance message includes the first information, and the first information includes the capabilities of the second terminal.

13. The method according to any one of claims 1-12, characterized in that, The receiving of the first information includes any of the following: Receiving the first information after the link is established; Receive the first information during the capability exchange process after link establishment.

14. The method according to any one of claims 1-13, characterized in that, The sending of the second information includes any of the following: After link establishment, send the second information; During the capability exchange process after link establishment, send the second information.

15. The method according to any one of claims 1-14, characterized in that, The capabilities of the first terminal or the second terminal are related to a service, which is ranging or sidelink SL positioning service.

16. The method according to any one of claims 1-15, characterized in that, The capability of the first terminal is the positioning method supported by the first terminal, and the capability of the second terminal is the positioning method supported by the second terminal.

17. A terminal selection method, characterized in that, Executed by the second terminal, the method includes: Send the first information, where the first information is used for the first terminal to determine whether to select the second terminal.

18. The method according to claim 17, wherein The method further includes: Receive the second information, where the second information at least includes: the capabilities of the first terminal; Determine whether to select the first terminal according to the second information.

19. The method according to any one of claims 17-18, characterized in that, The first information includes at least one of the following: The capabilities of the second terminal; Indication information, where the indication information is used to indicate the reason why the second terminal does not accept the request of the first terminal, and the request is included in the second information sent by the first terminal.

20. The method according to any one of claims 18-19, characterized in that, The second information further includes at least one of the following: Security information; Service information; First terminal information, where the first terminal information is used to describe the first terminal; Destination layer 2 identifier, where the destination layer 2 identifier is used for the second terminal to receive the second information; Ranging and sidelink positioning protocol RSPP metadata information, where the RSPP metadata information includes: the capabilities of the first terminal.

21. The method according to any one of claims 18-20, characterized in that, The determining whether to select the first terminal according to the second information includes any of the following: If the capabilities of the first terminal match the capabilities of the second terminal, determine to select the first terminal; If the capabilities of the first terminal do not match the capabilities of the second terminal, determine not to select the first terminal.

22. The method according to any one of claims 18 - 21, characterized in that, The sending of the first information includes any of the following: Send the first information, where the first information includes: the capabilities of the second terminal; the second terminal accepts the request of the first terminal included in the second information; Send the first information, where the first information includes: indication information, and the indication information is used to indicate the reason why the second terminal does not accept the request of the first terminal.

23. The method according to any one of claims 17-22, characterized in that, The first information further includes at least one of the following: Second terminal information, where the second terminal information is used to describe the second terminal; RSPP metadata information, where the RSPP metadata information includes: the capabilities of the second terminal.

24. The method according to any one of claims 17-23, characterized in that After determining to select the second terminal, the method further includes: Establish a link between the first terminal and the second terminal, or maintain the link between the first terminal and the second terminal.

25. The method according to any one of claims 17-23, characterized in that After determining not to select the second terminal, the method further includes: Do not establish a link between the first terminal and the second terminal, or release the link between the first terminal and the second terminal, or modify the link between the first terminal and the second terminal.

26. The method according to any one of claims 18-25, characterized in that, The receiving of the second information includes: Receive a direct communication request message, where the direct communication request message includes the second information, and the direct communication request message is used to request the establishment of a link between the first terminal and the second terminal.

27. The method according to claim 26, wherein, The sending of the first information includes: Send a direct communication rejection message, where the direct communication rejection message includes the first information, and the first information includes indication information, and the indication information is used to indicate the reason why the second terminal does not accept the request of the first terminal.

28. The method according to claim 26, wherein The sending of the first information includes: Send a direct communication acceptance message, where the direct communication acceptance message includes the first information, and the first information includes the capabilities of the second terminal.

29. The method according to any one of claims 17-28, characterized in that, The sending of the first information includes any one of the following: After the link is established, send the first information; During the capability exchange process after the link is established, send the first information.

30. The method according to any one of claims 18 - 28, characterized in that, The receiving of the second information includes any one of the following: After the link is established, receive the second information; During the capability exchange process after the link is established, receive the second information.

31. The method according to any one of claims 17-30, characterized in that, The capabilities of the first terminal or the second terminal are related to a service, and the service is ranging or sidelink SL positioning service.

32. The method according to any one of claims 17-31, characterized in that, The capability of the first terminal is the positioning method supported by the first terminal, and the capability of the second terminal is the positioning method supported by the second terminal.

33. A terminal selection method, characterized in that The method includes: The second terminal sends the first information; The first terminal receives the first information and determines whether to select the second terminal according to the first information.

34. A terminal, characterized in that, The terminal includes: A transceiver module, configured to receive the first information; A processing module, configured to determine whether to select the second terminal according to the first information.

35. A terminal, characterized in that, The terminal includes: A transceiver module, configured to send the first information, where the first information is used for the first terminal to determine whether to select the second terminal.

36. A communication device, characterized in that, Includes: One or more processors; Wherein, the processor is configured to execute the terminal selection method according to any one of claims 1-33.

37. A storage medium storing instructions, characterized in that, When the instruction runs on the communication device, the communication device is caused to execute the terminal selection method according to any one of claims 1-33.

38. A communication system, characterized in that, Includes a first terminal and a second terminal, where the first terminal is configured to execute the terminal selection method according to any one of claims 1-16, and the second terminal is configured to execute the terminal selection method according to any one of claims 17-32.

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