Node selection method, terminal and network-side equipment

Abstract

This application discloses a node selection method, a terminal, and a network-side device, belonging to the field of communication technology. The node selection method in this application includes: a first node selecting a second node; wherein the second node is used to locate the first node.

Description

Technical Field

[0001] This application belongs to the field of communication technology, specifically relating to a node selection method, a terminal, and network-side equipment. Background Technology

[0002] Currently, positioning based on the transmission and measurement of positioning reference signals through sidelinks (also translated as secondary links, direct links, auxiliary links, side links, etc.) between terminals is a new positioning method under discussion.

[0003] In this method of achieving positioning based on the transmission and measurement of positioning reference signals between terminals via sidelinks, the problem that needs to be solved is how to select other nodes for positioning when a node has a positioning requirement. Summary of the Invention

[0004] This application provides a node selection method, a terminal, and a network-side device, which can solve the problem of how to select nodes for positioning in a method of positioning reference signal transmission and measurement based on sidelink.

[0005] Firstly, a node selection method is provided, which includes:

[0006] The first node selects the second node; wherein the second node is used to locate the first node.

[0007] Secondly, a node selection method is provided, which includes:

[0008] The second node receives the first message sent by the first node.

[0009] Thirdly, a node selection device is provided, the device comprising:

[0010] The selection unit is used to select a second node; wherein the second node is used to locate the first node.

[0011] Fourthly, a node selection device is provided, the device comprising:

[0012] The fourth receiving unit is used to receive the first information sent by the first node.

[0013] Fifthly, a terminal is provided, the terminal including a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the node selection method as described in the first aspect, or implement the steps of the node selection method as described in the second aspect.

[0014] In a sixth aspect, a terminal is provided, including a processor and a communication interface, wherein the processor is used to select a second node; wherein the second node is used to locate the first node. Alternatively, a terminal is provided, including a processor and a communication interface, wherein the communication interface is used to receive first information sent by the first node.

[0015] In a seventh aspect, a network-side device is provided, the network-side device including a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the node selection method as described in the first aspect, or implement the steps of the node selection method as described in the second aspect.

[0016] Eighthly, a network-side device is provided, including a processor and a communication interface, wherein the processor is used to select a second node; wherein the second node is used to locate the first node. Alternatively, a network-side device is provided, including a processor and a communication interface, wherein the communication interface is used to receive first information sent by a first node.

[0017] In a ninth aspect, a readable storage medium is provided, on which a program or instructions are stored, which, when executed by a processor, implement the steps of the node selection method as described in the first aspect, or implement the steps of the node selection method as described in the second aspect.

[0018] In a tenth aspect, a chip is provided, the chip including a processor and a communication interface, the communication interface being coupled to the processor, the processor being configured to run a program or instructions to implement the node selection method as described in the first aspect, or to implement the node selection method as described in the second aspect.

[0019] Eleventhly, a computer program / program product is provided, the computer program / program product being stored in a non-transient storage medium, the program / program product being executed by at least one processor to implement the steps of the node selection method as described in the first aspect, or to implement the steps of the node selection method as described in the second aspect.

[0020] In this embodiment, the first node selects the second node, which is used to perform positioning with the first node. This solves the problem of how to select other nodes when a node has a positioning requirement. It can be applied to the method of positioning by sending and measuring positioning reference signals based on the sidelink between terminals to achieve sidelink positioning. Attached Figure Description

[0021] Figure 1 This is a structural diagram of a wireless communication system applicable to the embodiments of this application;

[0022] Figure 2 This is a schematic diagram of the Uu interface and PC5 interface architecture;

[0023] Figure 3 NR overall positioning flowchart;

[0024] Figure 4 One of the flowcharts illustrating the node selection method provided in this application embodiment;

[0025] Figure 5 A second flowchart illustrating the node selection method provided in this application embodiment;

[0026] Figure 6 One of the structural schematic diagrams of the node selection device provided in the embodiments of this application.

[0027] Figure 7 A second schematic diagram of the node selection device provided in the embodiments of this application;

[0028] Figure 8 This is a schematic diagram of the structure of a communication device provided in an embodiment of this application;

[0029] Figure 9 A schematic diagram of the hardware structure of a terminal to implement an embodiment of this application;

[0030] Figure 10 This is one of the structural schematic diagrams of the network-side device provided in the embodiments of this application;

[0031] Figure 11 This is a second schematic diagram of the network-side device provided in an embodiment of this application. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0033] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same class, not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0034] It is worth noting that the technologies described in this application are not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA), and other systems. The terms "system" and "network" in this application are often used interchangeably, and the described technologies can be used with the systems and radio technologies mentioned above, as well as with other systems and radio technologies. The following description describes New Radio (NR) systems for illustrative purposes, and the term NR is used in most of the following description; however, these technologies can also be applied to applications other than NR systems, such as 6th generation (6G) radio systems. th Generation 6G communication system.

[0035] Figure 1This diagram illustrates a structural diagram of a wireless communication system applicable to embodiments of this application. The wireless communication system includes a terminal 11 and a network-side device 12. Terminal 11 can also be referred to as a terminal device or user equipment (UE). Terminal 11 can be a mobile phone, tablet computer, laptop computer, personal digital assistant (PDA), handheld computer, netbook, ultra-mobile personal computer (UMPC), mobile internet device (MID), augmented reality (AR) / virtual reality (VR) device, robot, wearable device, vehicle-mounted device (VUE), pedestrian terminal (PUE), smart home (home appliances with wireless communication capabilities, such as refrigerators, televisions, washing machines, or furniture), etc. Wearable devices include: smartwatches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart chains, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, game consoles, etc. Terminal 11 can be a mobile phone, tablet computer, laptop computer, etc. A computer (also known as a laptop computer, personal digital assistant (PDA), handheld computer, netbook, ultra-mobile personal computer (UMPC), mobile internet device (MID), wearable device, vehicle-mounted device (VUE), pedestrian terminal (PUE), etc., is a terminal-side device. Wearable devices include smartwatches, wristbands, headphones, glasses, etc. It should be noted that the specific type of terminal 11 is not limited in the embodiments of this application.Network-side device 12 can be a base station or a core network. The base station can be referred to as a node B, evolved node B, access point, base transceiver station (BTS), radio base station, radio transceiver, basic service set (BSS), extended service set (ESS), B node, evolved B node (eNB), home B node, home evolved B node, WLAN access point, WiFi node, transmitting and receiving point (TRP), or any other suitable term in the field, as long as the same technical effect is achieved. The base station is not limited to specific technical terms. It should be noted that in this application embodiment, only the base station in the NR system is used as an example, but the specific type of base station is not limited.

[0036] With the development of communication technology and the diversification of demands, the application scenarios of wireless communication are becoming increasingly widespread, among which vehicle-to-everything (V2X) is a typical example. V2X aims to enable vehicles to interact with all entities that may affect them, with the goal of reducing accidents, alleviating traffic congestion, reducing environmental pollution, and providing other information services. Depending on the type of communication node between the vehicles, V2X mainly includes vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-network (V2N), and vehicle-to-pedestrian (V2P).

[0037] To distinguish it from the traditional uplink and downlink between User Equipment (UE) terminals and base stations based on the Uu interface, the communication link between the vehicle terminal and other nodes (excluding the base station) is called a Sidelink. The Sidelink interface can also be called the PC5 interface.

[0038] Figure 2 This is a schematic diagram of the Uu interface and PC5 interface architecture. Sidelink transmission based on the PC5 interface is independent of the UE's RRC state and cellular network coverage state, meaning the UE can perform sidelink communication even without cellular network coverage.

[0039] New Radio (NR) supports three Sidelink communication modes: unicast, groupcast, and broadcast. In unicast mode, UEs establish, modify, and release Sidelink unicast links by exchanging PC5-S and PC5-RRC messages.

[0040] Figure 3 A flowchart for the overall positioning process of NR. Figure 3 The functions of each key node are shown in Table 1.

[0041] Table 1 Functions of each key node

[0042]

[0043] NR positioning supports UE-based and UE-assisted positioning, and enhances upon the Long Term Evolution (LTE) positioning method by introducing new positioning methods.

[0044] Current positioning technologies include methods that rely on Radio Access Technology dependent (RAT-dependent) (where positioning reference signals are transmitted and measured via the Uu interface between the terminal and the base station to achieve positioning) or methods that do not rely on Radio Access Technology dependent (RAT-independent) (such as Global Navigation Satellite System (GNSS) positioning). A new positioning method under discussion is based on the transmission and measurement of positioning reference signals between terminals via sidelinks.

[0045] In this method of achieving positioning by transmitting and measuring positioning reference signals through sidelinks between terminals, the problem that needs to be solved is how to select other terminals corresponding to the sidelink and the number of other terminals when a terminal has a positioning requirement.

[0046] To address the problem of selecting other nodes for location services when a node requires positioning, this application provides the following node selection method. The node selection method provided in this application will be described in detail below with reference to the accompanying drawings, through some embodiments and application scenarios.

[0047] Figure 4 This is one of the flowcharts illustrating the node selection method provided in the embodiments of this application, such as... Figure 4As shown, the execution subject of this method is the first node, and the method includes the following steps:

[0048] Step 400: The first node selects the second node; wherein the second node is used to locate the first node.

[0049] The first node is the node that requires location services.

[0050] The second node is used to locate the first node. This can be understood as the second node performing related operations to locate the first node. For example, the second node sends, measures, and / or processes positioning reference signals to achieve positioning of the first node.

[0051] Optionally, the first node selects at least one second node.

[0052] Optionally, the number of second nodes may be limited or unlimited.

[0053] In this embodiment, the first node selects the second node, which is used to perform positioning with the first node. This solves the problem of how to select other nodes for positioning when a node has a positioning requirement. It can be applied to a method for positioning based on the transmission and measurement of positioning reference signals between terminals via sidelinks to achieve sidelink positioning.

[0054] The first node includes at least one of the following:

[0055] terminal;

[0056] Base station;

[0057] Core network functions.

[0058] The second node includes at least one of the following:

[0059] terminal;

[0060] Base station;

[0061] Core network functions.

[0062] The terminal can be a vehicle, a vulnerable road user (VRU), a roadside unit (RSU), or a pedestrian.

[0063] Core network functions can include Access and Mobility Management Function (AMF), LMF, Session Management Function (SMF), etc.

[0064] Optionally, if the first node is a terminal, the second node is a terminal, a base station, or a core network function; if the first node is a base station or a core network function, the second node is a terminal.

[0065] Optionally, the second node includes at least one of the following:

[0066] Nodes that do not need to establish a connection with the first node;

[0067] The node that needs to establish a connection with the first node.

[0068] Optionally, the first node does not need to establish a connection between the first node and the second node when selecting the second node; that is, the first node selects the second node before the first node establishes a connection with the second node.

[0069] Optionally, after the first node selects the second node, the first node establishes a connection with the selected second node.

[0070] Optionally, when the first node selects the second node, the second node needs to establish a connection with the first node.

[0071] Furthermore, when the second node is a node that needs to establish a connection with the first node, the step of the first node selecting the second node occurs during the process of establishing a connection between the first node and the second node, and / or occurs after the process of establishing a connection between the first node and the second node.

[0072] Optionally, the first node selects the second node during the process of establishing a connection with the second node.

[0073] Optionally, after a connection is established between the first node and the second node, the first node selects the second node.

[0074] Optionally, the first node selects the second node during the process of establishing a connection with the second node, and after the connection between the first node and the second node is established. For example, the first node is UE A, and the second nodes include UE B and UE C. UE A selects UE B during the process of establishing a connection with UE B, and UE A selects UE C after establishing a connection with UE C.

[0075] Optionally, establishing a connection between the first node and the second node includes one of the following:

[0076] When one of the first node and the second node is a terminal and the other is a base station, a Radio Resource Control (RRC) connection is established between the first node and the second node.

[0077] When both the first node and the second node are terminals, a PC5 unicast link connection is established between the first node and the second node; and / or, when both the first node and the second node are terminals, a PC5-RRC connection is established between the first node and the second node.

[0078] When one of the first node and the second node is a terminal and the other is a core network function, a non-access stratum (NAS) connection is established between the first node and the second node.

[0079] It is understandable that when one of the first node and the second node is a terminal and the other is a base station, the connection established between the first node and the second node is an RRC connection. For example, when the UE establishes an RRC connection with the base station, the UE is in the CONNECTED state of the RRC connection.

[0080] Optionally, when both the first node and the second node are terminals, the connection established between the first node and the second node is a PC5 unicast link. For example, UE A and UE B complete the PC5 unicast link establishment, and control information and user data are transmitted via the sidelink between UE A and UE B.

[0081] Optionally, when both the first node and the second node are terminals, the connection established between the first node and the second node is a PC5-RRC connection. For example, UE A and UE B establish an RRC connection through the PC5 interface.

[0082] Optionally, when both the first node and the second node are terminals, the connection established between the first node and the second node is a PC5 unicast link and a PC5-RRC connection. For example, if the first node is UE A and the second node is UE B, UE A and UE B will establish both a PC5 unicast link and a PC5 interface RRC connection.

[0083] Optionally, if one of the first node and the second node is a terminal and the other is a core network function, the connection established between the first node and the second node is a NAS connection. For example, the UE and the AMF establish a connection through the N1 interface.

[0084] Optionally, the PC5 unicast link connection established between the first node and the second node includes at least one of the following:

[0085] The first node sends a request message to the second node to establish a PC5 unicast link via PC5 broadcast;

[0086] The first node sends a request message to the second node to establish a PC5 unicast link via PC5 unicast.

[0087] In some alternative embodiments, when the step of the first node selecting the second node occurs during the process of establishing a connection between the first node and the second node, the request message for establishing the PC5 unicast link carries the first information.

[0088] It should be noted that the first information is used to assist the first node in selecting the second node. For example, the first node may include a first requirement (i.e., a requirement for the second node) in the first information. Only if the second node meets the first requirement can it provide feedback to the first node, thereby filtering out the second node. Another example is that the first information may include location-related information. A second node interested in this location-related information sends feedback to the first node, and the first node then selects the second node based on the feedback.

[0089] Furthermore, the first information includes requirements for the second node and / or location-related information. For example, a UE with location requirements may include its location requirements and / or location-related information in the PC5 unicast link establishment request message during the PC5 unicast link establishment process.

[0090] After receiving the first information sent by the first node, if the second node determines that it meets the positioning requirements in the first information and / or is interested in the positioning-related information in the first information, the second node will respond to the first node. Upon receiving the response from the second node, the first node determines that the second node has positioning capabilities and selects the second node for positioning. If the second node does not meet the requirements in the first information, or is not interested in the positioning-related information in the first information, the second node will not respond to the request message sent by the first node to establish a PC5 unicast link. The first node does not receive the response from the second node and therefore does not select the second node for positioning.

[0091] In this embodiment of the application, the first node selects the second node during the process of establishing a PC5 unicast link connection between the first node and the second node. The first node sends first information to the second node so that the first node selects the second node based on the feedback from the second node. The first information is carried in the request message for establishing the PC5 unicast link, which enables the selection of the node used for sidelink positioning.

[0092] Optionally, the content of the request message to establish a PC5 unicast link includes:

[0093] First information;

[0094] The first node is the Application Layer ID;

[0095] In the case where the request message for establishing a PC5 unicast link is broadcast via PC5, a defaultdestination Layer-2 ID is provided.

[0096] Optionally, the Application Layer ID of the first node includes, but is not limited to, at least one of the following: Application Layer ID is associated with a positioning application, Application Layer ID is associated with a relative positioning application, Application Layer ID is associated with an absolute positioning application, Application Layer ID is associated with both relative and absolute positioning applications, Application Layer ID is associated with a positioning type 1 application (e.g., high-precision positioning), Application Layer ID is associated with a positioning type 1 application (e.g., medium-precision positioning), and Application Layer ID is associated with a relative positioning type 1 application (e.g., high-precision relative positioning).

[0097] Optionally, the default destination Layer-2 ID includes, but is not limited to, at least one of the following: the default destination Layer-2 ID is associated with a positioning application; the default destination Layer-2 ID is associated with a relative positioning application; the default destination Layer-2 ID is associated with an absolute positioning application; the default destination Layer-2 ID is associated with both relative and absolute positioning applications; the default destination Layer-2 ID is associated with a positioning type 1 application (e.g., high-precision positioning); the default destination Layer-2 ID is associated with a positioning type 1 application (e.g., medium-precision positioning); and the default destination Layer-2 ID is associated with a relative positioning type 1 application (e.g., high-precision relative positioning).

[0098] Optionally, the content of the first information includes at least one of the following:

[0099] First requirement;

[0100] Location-related information;

[0101] Information about the first node;

[0102] Request information about the second node.

[0103] The first requirement is for the second node. Only if the second node meets the first requirement will the second node respond to the request message sent by the first node to establish a PC5 unicast link.

[0104] In the embodiments of this application, the first information includes requirements for the second node and / or location-related information. Through the interaction of location-related information, it is possible to select a node for sidelink positioning.

[0105] Optionally, the first requirement includes at least one of the following:

[0106] The capability requirements for the second node;

[0107] Reference Signal Receiving Power (RSRP) threshold value;

[0108] The Zone information requirements for the second node;

[0109] The movement status requirements of the second node;

[0110] Network coverage requirements for the second node;

[0111] The PC5 unicast link status requirement for the second node.

[0112] For example, the second node only responds to the request message sent by the first node to establish a PC5 unicast link when the RSRP of the second node is higher than the RSRP threshold value.

[0113] Zone information includes Zone ID, Zone ID list, etc.

[0114] The capability requirements of the second node include at least one of the following:

[0115] It has absolute positioning capability;

[0116] It has relative positioning capabilities;

[0117] It has RAT-dependent positioning capabilities for wireless access technology;

[0118] It has independent RAT-independent positioning capabilities based on wireless access technology;

[0119] It has the ability to locate itself via a sidelink;

[0120] Positioning accuracy;

[0121] It possesses the ability to maintain its location integrity.

[0122] The second node having RAT-dependent positioning capability means that the second node supports RAT-dependent positioning methods, such as positioning by sending and measuring positioning reference signals through the Uu interface between the terminal and the base station.

[0123] The second node having RAT-independent positioning capability means that the second node supports RAT-independent positioning methods, such as GNSS positioning methods.

[0124] The positioning accuracy includes: high accuracy, medium accuracy, low accuracy, accuracy range, not lower than X, not higher than Y, etc. The value ranges of "high", "medium", and "low" can be predetermined.

[0125] The ability to ensure the integrity of a location is called the integrity of a location.

[0126] Optionally, the movement state requirements of the second node include at least one of the following:

[0127] It is in a static state;

[0128] In a moving state;

[0129] A stationary state takes precedence over a moving state.

[0130] Movement speed must not exceed the first threshold;

[0131] The movement speed is a value from the set;

[0132] Movement speed must not fall below the second threshold;

[0133] Movement speed level.

[0134] For example, movement speed levels are high, medium, and low. The range of values ​​for "high," "medium," and "low" can be predetermined.

[0135] Optionally, the network coverage status requirements of the second node include at least one of the following:

[0136] The second node needs to be within the coverage of the base station;

[0137] The second node does not need to be within the coverage of the base station.

[0138] Optionally, the PC5 unicast link status of the second node requires at least one of the following:

[0139] A PC5 unicast link needs to be established with all terminals except the first node;

[0140] It is not necessary to have established PC5 unicast links with other terminals besides the first node;

[0141] The number of other terminals that have established PC5 unicast links is no less than the third threshold;

[0142] The number of other terminals that have already established a PC5 unicast link does not exceed the fourth threshold;

[0143] The set / range of other terminals that have established PC5 unicast links.

[0144] Optionally, the location-related information includes at least one of the following:

[0145] Positioning precision / accuracy;

[0146] The integrity of the positioning;

[0147] Type of positioning;

[0148] Location update cycle;

[0149] Positioning technology.

[0150] In other words, the first information including positioning-related information means that the first information includes at least one of the following: the required accuracy / precision of this positioning, the required integrity of this positioning, the type of positioning required (e.g., absolute positioning, relative positioning), the update cycle of this positioning, and the technology used for this positioning (e.g., time-based positioning, angle-based positioning, distance positioning based on RSRP).

[0151] Optionally, the information of the first node or the information of the second node includes at least one of the following:

[0152] Zone information for the first or second node;

[0153] Movement status information;

[0154] Network coverage status;

[0155] PC5 unicast link status;

[0156] Location-related capability information.

[0157] It is understood that the information of the first node includes at least one of the following: the zone information of the first node; the mobility status information of the first node; the network coverage status of the first node; the PC5 unicast link status of the first node; and the location-related capability information of the first node.

[0158] The information of the second node includes at least one of the following: the zone information of the second node; the mobility status information of the second node; the network coverage status of the second node; the PC5 unicast link status of the second node; and the location-related capability information of the second node.

[0159] Optionally, the movement status information includes at least one of the following:

[0160] At rest or in motion;

[0161] Movement speed value;

[0162] Movement speed rating;

[0163] The movement speed is not lower than the fifth threshold and / or not higher than the sixth threshold;

[0164] The range of movement speed values.

[0165] Optionally, the network coverage status includes at least one of the following:

[0166] Within the coverage area of ​​the base station;

[0167] It is not within the coverage area of ​​the base station.

[0168] Optionally, the PC5 unicast link status includes at least one of the following:

[0169] A PC5 unicast link has been established with other terminals, or a PC5 unicast link has not been established with other terminals;

[0170] In the case of the PC5 unicast link state of the second node, it means that a PC5 unicast link has been established with other terminals besides the first node or a PC5 unicast link has not been established with other terminals besides the first node;

[0171] The number of other terminals that have already established a PC5 unicast link is no less than the seventh threshold;

[0172] In the case of the PC5 unicast link state of the second node, the number of other terminals besides the first node that have established PC5 unicast links is not less than the eighth threshold.

[0173] The number of other terminals that have already established a PC5 unicast link does not exceed the ninth threshold;

[0174] In the case of the PC5 unicast link state of the second node, the number of other terminals besides the first node that have established PC5 unicast links does not exceed the tenth threshold.

[0175] The set of other terminals that have already established PC5 unicast links;

[0176] In the case of the PC5 unicast link state of the second node, it is the set of the number of other terminals besides the first node that have established PC5 unicast links.

[0177] In this context, a set refers to a situation where a definite value is not given, but rather multiple values ​​are provided, or a range of values.

[0178] Optionally, the location-related capability information includes at least one of the following:

[0179] It has absolute positioning capability;

[0180] It has relative positioning capabilities;

[0181] It has RAT-dependent positioning capability;

[0182] It has RAT-independent positioning capability;

[0183] It has the ability to locate itself via a sidelink;

[0184] Positioning accuracy;

[0185] It possesses the ability to maintain its location integrity.

[0186] Optionally, after the step of sending the request message to the second node to establish the PC5 unicast link, the method further includes:

[0187] The first node receives the second information sent by the second node.

[0188] In this embodiment, the first node receives the second information fed back by the second node and determines whether to select the second node, thereby enabling the selection of a node used for sidelink positioning.

[0189] Optionally, the first node receives second information sent by the second node, specifically including:

[0190] If the first condition is met, the first node receives the second information sent by the second node.

[0191] Optionally, the first condition includes at least one of the following:

[0192] When the first information contains a first requirement, the second node satisfies the first requirement in the first information;

[0193] When the first information contains location-related information, the second node is interested in the location-related information in the first information.

[0194] It is understandable that when the first node receives the second information sent by the second node, it indicates that after obtaining the first information sent by the first node, the second node determines that it meets the positioning requirements in the first information, and / or the second node is interested in the positioning-related information in the first information. Therefore, the first node determines that the second node has positioning capabilities and selects the second node for positioning.

[0195] If the second node does not meet the requirements in the first message, or is not interested in the location-related information in the first message, the second node will not respond to the request message sent by the first node to establish a PC5 unicast link, and the second node will not send the second message to the first node. If the first node does not receive the second message sent by the second node, it will not select the second node for location.

[0196] Optionally, the content of the second information includes at least one of the following:

[0197] Zone information for the second node;

[0198] The RSRP value measured at the second node;

[0199] The movement status information of the second node;

[0200] Network coverage status of the second node;

[0201] The PC5 unicast link status of the second node;

[0202] The second node contains location-related capability information.

[0203] It should be noted that the understanding of the content of the second information mentioned above can refer to the description of Zone information, mobility status information, network coverage status, PC5 unicast link status, and location-related capability information in the foregoing embodiments, and will not be repeated here.

[0204] In this embodiment of the application, the second information includes Zone information, mobility status information, network coverage status, PC5unicast link status, and location-related capability information. Through the interaction of the second information, it is possible to select a node for sidelink positioning.

[0205] Optionally, the second information is sent via messages, Media Access Control Element (MAC CE) and / or Sidelink Control Information (SCI).

[0206] Optionally, the request message to establish a PC5 unicast link includes at least one of the following:

[0207] Direct Communication Request message;

[0208] The newly defined request message for establishing a PC5 unicast link;

[0209] Establish security-related messages with the second node.

[0210] Optionally, the second information can be carried in different messages, and may include at least one of the following:

[0211] When the request message for establishing the PC5 unicast link is a Direct Communication Request message, the Direct Communication Accept message carries the second information;

[0212] If the request message for establishing a PC5 unicast link is a newly defined request message for establishing a PC5 unicast link, the newly defined request message for responding to the request message for establishing a PC5 unicast link carries the second information;

[0213] For example, the newly defined message for responding to a request to establish a PC5 unicast link carries the second information and is a new message that is different from the previous Direct Communication Accept message in order to locate the relevant functions to establish a PC5 unicast link between two terminals.

[0214] In the case that the request message for establishing a PC5 unicast link is a security-related message for the second node, the security-related message for the first node carries the second information.

[0215] Optionally, the messages related to establishing security with the first node are messages in the Direct Auth and KeyEstablishment procedure and / or the Direct Security Mode Command procedure.

[0216] In the embodiments of this application, various methods for information exchange between the first node and the second node are provided, which can improve the flexibility of selecting the node for sidelink positioning.

[0217] In some alternative embodiments, where the step of the first node selecting the second node occurs after the process of establishing a connection between the first node and the second node, the method further includes:

[0218] The first node sends the first information to the second node.

[0219] That is, after the first node and the second node establish a connection, the first node sends the first information to the second node.

[0220] To save resource consumption, the request message sent by the first node to the second node to establish a PC5 unicast link does not include the content of the first information.

[0221] In this embodiment of the application, after the first node and the second node establish a connection, the first node sends first information to the second node. The first information is information sent by the first node to the second node so that the first node can select the second node based on the feedback from the second node, thereby enabling the selection of the node used for sidelink positioning.

[0222] Optionally, the content of the first information includes at least one of the following:

[0223] First requirement;

[0224] Location-related information;

[0225] Information about the first node;

[0226] Request information about the second node.

[0227] It should be noted that the content of the first information can be referred to the description in the foregoing embodiments, and will not be repeated here.

[0228] Optionally, the first information is sent via message, MAC CE, and / or SCI, etc.

[0229] Optionally, after the first node sends the first information to the second node, it further includes at least one of the following:

[0230] The first node receives the second information sent by the second node.

[0231] Optionally, the node selection method provided in this embodiment includes the following steps:

[0232] After the first node establishes a connection with the second node, the first node sends the first message to the second node;

[0233] The first node receives the second message sent by the second node;

[0234] The first node selects the second node.

[0235] Optionally, the first node receives second information sent by the second node, specifically including:

[0236] If the first condition is met, the first node receives the second information sent by the second node.

[0237] Optionally, the node selection method provided in this embodiment includes the following steps:

[0238] After the first node establishes a connection with the second node, the first node sends the first message to the second node;

[0239] If the first condition is met, the first node receives the second information sent by the second node;

[0240] The first node selects the second node.

[0241] In this embodiment of the application, the node used for sidelink positioning can be selected through the interaction of the second information.

[0242] Optionally, the first condition includes at least one of the following:

[0243] When the first information contains a first requirement, the second node satisfies the first requirement in the first information;

[0244] When the first information contains location-related information, the second node is interested in the location-related information in the first information.

[0245] Optionally, the content of the second information includes at least one of the following:

[0246] Zone information for the second node;

[0247] The RSRP value measured at the second node;

[0248] The movement status information of the second node;

[0249] Network coverage status of the second node;

[0250] The PC5 unicast link status of the second node;

[0251] The second node contains location-related capability information.

[0252] The understanding of the content of the second information in this embodiment can be referred to the description in the foregoing embodiments, and will not be repeated here.

[0253] Optionally, the second information is sent via message, MAC CE, and / or SCI, etc.

[0254] Optionally, the first node sends the first information to the second node through at least one of the following:

[0255] UECapabilityEnquirySidelink message;

[0256] RRCReconfigurationSidelink message;

[0257] Link Identifier Update Request message;

[0258] Link Identifier Update Ack message;

[0259] Disconnect Request message;

[0260] Link Modification Request message;

[0261] Keep-alive messages;

[0262] The newly defined PC5-RRC message;

[0263] The newly defined PC5-S message.

[0264] Optionally, the second information can be carried in different messages, and may include at least one of the following:

[0265] When the first node sends the first information to the second node via the UECapabilityEnquirySidelink message, the UECapabilityInformationSidelink message carries the second information.

[0266] When the first node sends the first information to the second node via the RRCReconfigurationSidelink message, the RRCReconfigurationCompleteSidelink message carries the second information.

[0267] When the first node sends the first information to the second node via a Link Identifier Update Request message, the Link Identifier Update Response message carries the second information;

[0268] When the first node sends the first information to the second node via a Disconnect Request message, the Disconnect Response message carries the second information;

[0269] When the first node sends the first information to the second node via a Link Modification Request message, the Link Modification Accept message carries the second information;

[0270] When the first node sends the first information to the second node via a Keep-alive message, the Keep-alive Ack message carries the second information.

[0271] When the first node sends the first information to the second node through the newly defined PC5-RRC message, the newly defined PC5-RRC message carries the second information;

[0272] When the first node sends the first information to the second node through the newly defined PC5-S message, the newly defined PC5-S message carries the second information.

[0273] In the embodiments of this application, various methods for information exchange between the first node and the second node are provided, which improves the flexibility of selecting the node for sidelink positioning.

[0274] In some optional embodiments, when the step of the first node selecting the second node occurs during the process of establishing a connection between the first node and the second node, or when the second node does not need to establish a connection with the first node, the method further includes:

[0275] The first node broadcasts the first information to the second node.

[0276] Optionally, during the process of establishing a connection between the first node and the second node, the first node broadcasts first information to the second node.

[0277] Optionally, the first node selects the second node based on the feedback from the second node regarding the first information.

[0278] At this time, in order to save resource consumption, the request message sent by the first node to the second node to establish a PC5 unicast link does not carry the content of the first information.

[0279] Optionally, when the second node does not need to establish a connection with the first node, the node selection method includes the following steps: the first node broadcasts first information to the second node; the first node selects the second node based on the feedback from the second node to the first information; and the first node establishes a connection with the selected second node.

[0280] In this embodiment of the application, the first node broadcasts first information to the second node. The first information is information sent by the first node to the second node so that the first node selects the second node for positioning based on the feedback from the second node, thereby enabling the selection of a node for sidelink positioning.

[0281] Optionally, the content of the first information includes at least one of the following:

[0282] First requirement;

[0283] Location-related information;

[0284] Information about the first node;

[0285] Request information about the second node.

[0286] It should be noted that the content of the first information can be referred to the description in the foregoing embodiments, and will not be repeated here.

[0287] Optionally, after the step of the first node broadcasting the first information to the second node, the method further includes at least one of the following:

[0288] The first node receives the second information sent by the second node.

[0289] Optionally, the node selection method provided in this embodiment includes the following steps:

[0290] During the process of establishing a connection between the first node and the second node, or before establishing a connection between the first node and the second node, the first node broadcasts the first information to the second node;

[0291] The first node receives the second message sent by the second node;

[0292] The first node selects the second node.

[0293] Optionally, the first node receives second information sent by the second node, specifically including:

[0294] If the first condition is met, the first node receives the second information sent by the second node.

[0295] Optionally, the node selection method provided in this embodiment includes the following steps:

[0296] During the process of establishing a connection between the first node and the second node, or before establishing a connection between the first node and the second node, the first node broadcasts the first information to the second node;

[0297] If the first condition is met, the first node receives the second information sent by the second node;

[0298] The first node selects the second node.

[0299] Optionally, the first condition includes at least one of the following:

[0300] When the first information contains a first requirement, the second node satisfies the first requirement in the first information;

[0301] When the first information contains location-related information, the second node is interested in the location-related information in the first information.

[0302] Optionally, the content of the second information includes at least one of the following:

[0303] The Application Layer ID of the second node;

[0304] In the case where the second piece of information is broadcast via PC5, a default destination Layer-2 ID is provided.

[0305] Zone information for the second node;

[0306] The RSRP value measured at the second node;

[0307] The movement status information of the second node;

[0308] Network coverage status of the second node;

[0309] The PC5 unicast link status of the second node;

[0310] The second node contains location-related capability information.

[0311] The understanding of the content of the second information in this embodiment can be referred to the description in the foregoing embodiments, and will not be repeated here.

[0312] In this embodiment of the application, after the first node broadcasts the first information to the second node, it receives the second information sent by the second node. Through the information interaction between the first node and the second node, the node used for sidelink positioning can be selected.

[0313] Optionally, the second information can be carried in different messages, and may include at least one of the following:

[0314] If the step of selecting the second node by the first node occurs during the process of establishing a connection between the first node and the second node, the Direct Communication Request message carries the second information;

[0315] If the step of selecting the second node by the first node occurs during the process of establishing a connection between the first node and the second node, the newly defined request message for establishing a PC5 unicast link carries the second information;

[0316] If the step of selecting the second node by the first node occurs during the process of establishing a connection between the first node and the second node, the security-related message established with the first node carries the second information.

[0317] If the second node does not need to establish a connection with the first node, the broadcast message other than the request message to establish a PC5 unicastlink carries the second information.

[0318] In the embodiments of this application, various methods for information exchange between the first node and the second node are provided, which improves the flexibility of selecting the node for sidelink positioning.

[0319] Based on the above embodiments, optionally, the first node selects the second node, including:

[0320] The first node selects the second node according to the first rule;

[0321] The first rule is agreed upon by the protocol and / or depends on the implementation of the first node.

[0322] As described in the preceding embodiments, the first node selects the second node based on the feedback from the second node regarding the first information. How the first node specifically selects the second node based on the feedback from the second node regarding the first information can be determined by the protocol and / or depends on the implementation of the first node. For example, during the establishment of a PC5 unicast link, a UE with positioning needs can put positioning-related information and positioning requirements into a corresponding message (such as a Direct Communication Request message). Other UEs that meet the positioning requirements respond to the UE's message, and the UE that responded to the UE's message is selected for positioning. Alternatively, a UE with positioning needs can broadcast positioning-related information and requirements, select a UE for positioning based on the feedback from other UEs, and then establish a PC5 unicast link with these UEs. Or, after establishing a PC5 unicast link with other UEs, a UE with positioning needs can interact with positioning capabilities and select a UE for positioning based on the feedback from other UEs.

[0323] In this embodiment, the first node selects the second node according to the first rule, which can ensure that the selected node is effective for sidelink positioning.

[0324] Optionally, after the step of selecting the second node from the first node, the method further includes:

[0325] The first node sends a third message to the second node.

[0326] That is, after the first node selects the second node, it informs the second node whether it has been selected through third information.

[0327] Optionally, if all second nodes are selected, the first node sends a third message to all second nodes.

[0328] Optionally, if some of the second nodes are selected, the first node sends third information to the selected second nodes.

[0329] Optionally, if some of the second nodes are selected, the first node sends third information to the second nodes that are not selected.

[0330] Optionally, the first node sends third information to the second node, including at least one of the following:

[0331] The first node sends a third message to the selected second node;

[0332] The first node sends a third message to the second node that was not selected.

[0333] Optionally, the third information includes at least one of the following:

[0334] In the case where the first node sends third information to the selected second node, the information is used to indicate that the second node was selected by the first node as a node for positioning;

[0335] In the event that the first node sends third information to the second node that has not been selected, the information is used to indicate that the second node has not been selected by the first node as a node for positioning.

[0336] Information used to indicate that the second node was not selected by the first node for positioning;

[0337] Information used to indicate that the second node was selected by the first node for positioning.

[0338] In this embodiment, after the first node selects the second node, it sends a notification message to the corresponding node, which can ensure the selection of the node used for sidelink positioning.

[0339] In some optional embodiments, the first node selecting the second node includes:

[0340] The first node selects the second node based on the first instruction information sent by the third node.

[0341] The first indication information is used to indicate that the first node can be used to locate the second node.

[0342] Optionally, when the selection of the second node by the first node does not require the establishment of a connection between the first node and the second node, and both the first node and the second node are terminals, the first node selects the second node according to the instruction information of the third node.

[0343] Optionally, the third node is at least one of the following: a base station; a core network function.

[0344] Optionally, after the first node selects the second node based on the first indication information sent by the third node, the method further includes: the first node sending a Direct Communication Request message to the second node.

[0345] In this embodiment, the terminal can directly select the second node according to the instructions of the base station and / or core network functions, which can conveniently achieve the selection of the node used for sidelink positioning.

[0346] Based on the above embodiments, the number of the second node satisfies any one of the following:

[0347] No restrictions;

[0348] There are limitations.

[0349] "No restriction" means there is no requirement for the number of second nodes. "Restricted" means there is a certain requirement for the number of second nodes.

[0350] In this embodiment of the application, the first node can send first information to a limited number of second nodes and select at least one second node to achieve sidelink positioning.

[0351] Figure 5 This is a second flowchart illustrating the node selection method provided in the embodiments of this application, as shown below. Figure 5 As shown, the execution entity of this method is the second node, and the method includes the following steps:

[0352] Step 500: The second node receives the first information sent by the first node.

[0353] For an understanding of the first and second nodes, please refer to [reference needed]. Figure 4 The descriptions in the illustrated embodiments will not be repeated here.

[0354] It should be noted that the first information is used to assist the first node in selecting the second node. For example, the first node may include a first requirement (i.e., a requirement for the second node) in the first information. Only if the second node meets the first requirement can it provide feedback to the first node, thereby filtering out the second node. Another example is that the first information may include location-related information. A second node interested in this location-related information sends feedback to the first node, and the first node then selects the second node based on the feedback.

[0355] Furthermore, the first information includes requirements for the second node and / or location-related information.

[0356] Optionally, the content of the first information includes at least one of the following:

[0357] First requirement;

[0358] Location-related information;

[0359] Information about the first node;

[0360] Request information about the second node.

[0361] It should be noted that the understanding of the content of the first piece of information can be found by referring to... Figure 4 The descriptions in the illustrated embodiments will not be repeated here.

[0362] In this embodiment, the second node receives the first information sent by the first node. The second node is used to locate with the first node, which solves the problem of how to select other nodes for location when a node has a location requirement. It can be applied to the method of realizing location by sending and measuring positioning reference signals based on the sidelink between terminals, thus realizing sidelink positioning.

[0363] Optionally, the second node receives the first information sent by the first node, including:

[0364] Receive the connection establishment request message sent by the first node;

[0365] Obtain the first information carried in the connection establishment request message.

[0366] That is, the first information is carried in the connection establishment request message, and the first node selects the second node during the process of establishing a connection between the first node and the second node.

[0367] Optionally, the connection establishment request message is a request message to establish a PC5 unicast link.

[0368] Optionally, before the step of the second node receiving the first information sent by the first node, the method further includes:

[0369] The second node establishes a connection with the first node.

[0370] That is, the step of the first node selecting the second node occurs after the connection between the first node and the second node is established.

[0371] Optionally, the second node receives the first information sent by the first node, including:

[0372] If the second node does not establish a connection with the first node, the second node receives the first information broadcast by the first node;

[0373] If the step of the first node selecting the second node occurs during the process of establishing a connection between the first node and the second node, the second node receives the first information broadcast by the first node.

[0374] That is, if the first node selects the second node without requiring the establishment of a connection between the first node and the second node, or if the selection of the second node by the first node occurs during the process of establishing a connection between the first node and the second node, the first information can be sent by the first node via broadcast.

[0375] Optionally, the method further includes:

[0376] The second node sends a second message to the first node.

[0377] In this embodiment, the second node feeds back second information to the first node, which enables the first node to determine whether to select the second node, thus enabling the selection of a node used for sidelink positioning.

[0378] Optionally, the second node sends second information to the first node, specifically including:

[0379] If the first condition is met, the second node sends the second information to the first node.

[0380] Optionally, the first condition includes at least one of the following:

[0381] When the first information contains a first requirement, the second node satisfies the first requirement in the first information;

[0382] When the first information contains location-related information, the second node is interested in the location-related information in the first information.

[0383] Optionally, after receiving the first information sent by the first node, if the second node determines that it meets the positioning requirements in the first information, and / or the second node is interested in the positioning-related information in the first information, then the second node sends the second information to the first node, thereby enabling the first node to determine that the second node has positioning capabilities and select the second node for positioning.

[0384] Understandably, if the second node does not meet the requirements of the first message, or is not interested in the location-related information in the first message, then the second node will not respond to the first message sent by the first node, and the second node will not send the second message to the first node. If the first node does not receive the second message sent by the second node, it will not select the second node for location.

[0385] Optionally, the content of the second information includes at least one of the following:

[0386] Zone information for the second node;

[0387] The RSRP value measured at the second node;

[0388] The movement status information of the second node;

[0389] Network coverage status of the second node;

[0390] The PC5 unicast link status of the second node;

[0391] The second node contains location-related capability information.

[0392] It should be noted that the understanding of the content of the second piece of information can refer to... Figure 4 The descriptions in the illustrated embodiments will not be repeated here.

[0393] In some optional embodiments, the second node sends second information to the first node, including at least one of the following:

[0394] If the Direct Communication Request message carries the first information, the second node sends the second information to the first node via the Direct Communication Accept message;

[0395] When the newly defined request message for establishing a PC5 unicast link carries the first information, the second node sends the second information to the first node through the newly defined request message for responding to the establishment of a PC5 unicast link;

[0396] If the first information is carried in a security-related message established with the second node, the second node sends the second information to the first node through the security-related message established with the first node.

[0397] Understandably, if the first information is carried in the request message for establishing the PC5 unicast link, the second information is carried in the corresponding response message.

[0398] In some optional embodiments, the second node sends second information to the first node, including at least one of the following:

[0399] When the UECapabilityEnquirySidelink message carries the first information, the second node sends the second information to the first node through the UECapabilityInformationSidelink message.

[0400] When the RRCReconfigurationSidelink message carries the first information, the second node sends the second information to the first node through the RRCReconfigurationCompleteSidelink message.

[0401] If the Link Identifier Update Request message carries the first information, the second node sends the second information to the first node via the Link Identifier Update Response message;

[0402] If the Disconnect Request message carries the first information, the second node sends the second information to the first node via a Disconnect Response message;

[0403] If the Link Modification Request message carries the first information, the second node sends the second information to the first node via the Link Modification Accept message;

[0404] If the Keep-alive message carries the first information, the second node sends the second information to the first node via the Keep-aliveAck message;

[0405] When the newly defined PC5-RRC message carries the first information, the second node sends the second information to the first node through the newly defined PC5-RRC message.

[0406] When the newly defined PC5-S message carries the first information, the second node sends the second information to the first node through the newly defined PC5-S message.

[0407] It is understandable that, if the first information is carried through the aforementioned messages, the second information is carried by the corresponding response messages.

[0408] Optionally, the second node sends second information to the first node via at least one of the following:

[0409] Direct Communication Request message;

[0410] The newly defined request message for establishing a PC5 unicast link;

[0411] Establish security-related messages with the first node;

[0412] Broadcast messages other than the request message to establish a PC5 unicast link.

[0413] Optionally, if the first node sends the first information to the second node via broadcast, the second node can send the second information to the first node through the aforementioned messages.

[0414] In the embodiments of this application, various methods for information exchange between the first node and the second node are provided, which can improve the flexibility of selecting the node for sidelink positioning.

[0415] It should be noted that the node selection method provided in this application embodiment can be executed by a node selection device, or by a control module within the node selection device for executing the node selection method. This application embodiment uses the execution of the node selection method by a node selection device as an example to illustrate the node selection device provided in this application embodiment.

[0416] Figure 6 This is one of the structural schematic diagrams of the node selection device provided in the embodiments of this application, such as... Figure 6 As shown, the node selection device 600 includes:

[0417] Selection unit 601 is used to select a second node; wherein the second node is used to locate the first node.

[0418] In this embodiment, the first node selects the second node, which is used for positioning with the first node. This solves the problem of how to select other nodes when a node has a positioning requirement. It can be applied to the method of positioning by sending and measuring positioning reference signals based on the sidelink between terminals to achieve sidelink positioning.

[0419] Optionally, the second node includes at least one of the following:

[0420] Nodes that do not need to establish a connection with the first node;

[0421] The node that needs to establish a connection with the first node.

[0422] Optionally, if the second node is a node that needs to establish a connection with the first node, the step of the first node selecting the second node occurs during the process of establishing a connection between the first node and the second node, and / or occurs after the process of establishing a connection between the first node and the second node.

[0423] Optionally, the first node includes at least one of the following:

[0424] terminal;

[0425] Base station;

[0426] Core network functions;

[0427] The second node includes at least one of the following:

[0428] terminal;

[0429] Base station;

[0430] Core network functions.

[0431] Optionally, establishing a connection between the first node and the second node includes one of the following:

[0432] When one of the first node and the second node is a terminal and the other is a base station, a Radio Resource Control (RRC) connection is established between the first node and the second node;

[0433] When both the first node and the second node are terminals, a PC5 unicast link connection is established between the first node and the second node; and / or, when both the first node and the second node are terminals, a PC5-RRC connection is established between the first node and the second node.

[0434] When one of the first node and the second node is a terminal and the other is a core network function, a non-access stratum (NAS) connection is established between the first node and the second node.

[0435] Optionally, the PC5 unicast link connection established between the first node and the second node includes at least one of the following:

[0436] The first node sends a request message to the second node to establish a PC5 unicast link via PC5 broadcast;

[0437] The first node sends a request message to the second node to establish a PC5 unicast link via PC5 unicast.

[0438] Optionally, if the step of the first node selecting the second node occurs during the process of establishing a connection between the first node and the second node, the request message for establishing the PC5 unicast link carries the first information.

[0439] In this embodiment of the application, the first node selects the second node during the process of establishing a PC5 unicast link connection between the first node and the second node. The first node sends first information to the second node so that the first node selects the second node based on the feedback from the second node. The first information is carried in the request message for establishing the PC5 unicast link, which enables the selection of the node used for sidelink positioning.

[0440] Optionally, the device further includes a first receiving unit for receiving second information sent by the second node;

[0441] Optionally, the first receiving unit is specifically used for:

[0442] If the first condition is met, the first node receives the second information sent by the second node.

[0443] In this embodiment of the application, the first node can determine whether to select the second node based on the receipt of the second information, thereby enabling the selection of the node used for sidelink positioning.

[0444] Optionally, the request message to establish a PC5 unicast link includes at least one of the following:

[0445] Direct Communication Request message;

[0446] The newly defined request message for establishing a PC5 unicast link;

[0447] Establish security-related messages with the second node.

[0448] Optionally, the second information can be carried in different messages, and may include at least one of the following:

[0449] When the request message for establishing the PC5 unicast link is a Direct Communication Request message, the Direct Communication Accept message carries the second information;

[0450] If the request message for establishing a PC5 unicast link is a newly defined request message for establishing a PC5 unicast link, the newly defined request message for responding to the request message for establishing a PC5 unicast link carries the second information;

[0451] In the case that the request message for establishing a PC5 unicast link is a security-related message for the second node, the security-related message for the first node carries the second information.

[0452] In the embodiments of this application, various methods for information exchange between the first node and the second node are provided, which can improve the flexibility of selecting the node for sidelink positioning.

[0453] Optionally, if the step of selecting the second node by the first node occurs after the process of establishing a connection between the first node and the second node, the apparatus further includes:

[0454] The first sending unit is used to send first information to the second node.

[0455] In this embodiment of the application, after the first node and the second node establish a connection, the first node sends first information to the second node. The first information is information sent by the first node to the second node so that the first node can select the second node for positioning based on the feedback from the second node, thereby enabling the selection of a node for sidelink positioning.

[0456] Optionally, the device further includes a second receiving unit for receiving second information sent by the second node.

[0457] Optionally, the second receiving unit is specifically used for:

[0458] If the first condition is met, the second information sent by the second node is received.

[0459] In this embodiment of the application, the node used for sidelink positioning can be selected through the interaction of the second information.

[0460] Optionally, the first node sends the first information to the second node through at least one of the following:

[0461] UECapabilityEnquirySidelink message;

[0462] RRCReconfigurationSidelink message;

[0463] Link Identifier Update Request message;

[0464] Link Identifier Update Ack message;

[0465] Disconnect Request message;

[0466] Link Modification Request message;

[0467] Keep-alive messages;

[0468] The newly defined PC5-RRC message;

[0469] The newly defined PC5-S message.

[0470] Optionally, the second information can be carried in different messages, and may include at least one of the following:

[0471] When the first node sends the first information to the second node via the UECapabilityEnquirySidelink message, the UECapabilityInformationSidelink message carries the second information.

[0472] When the first node sends the first information to the second node via the RRCReconfigurationSidelink message, the RRCReconfigurationCompleteSidelink message carries the second information.

[0473] When the first node sends the first information to the second node via a Link Identifier Update Request message, the Link Identifier Update Response message carries the second information;

[0474] When the first node sends the first information to the second node via a Disconnect Request message, the Disconnect Response message carries the second information;

[0475] When the first node sends the first information to the second node via a Link Modification Request message, the Link Modification Accept message carries the second information;

[0476] When the first node sends the first information to the second node via a Keep-alive message, the Keep-alive Ack message carries the second information.

[0477] When the first node sends the first information to the second node through the newly defined PC5-RRC message, the newly defined PC5-RRC message carries the second information;

[0478] When the first node sends the first information to the second node through the newly defined PC5-S message, the newly defined PC5-S message carries the second information.

[0479] In the embodiments of this application, various methods for information exchange between the first node and the second node are provided, which can improve the flexibility of selecting the node for sidelink positioning.

[0480] Optionally, when the step of the first node selecting the second node occurs during the process of establishing a connection between the first node and the second node, or when the second node does not need to establish a connection with the first node, the apparatus further includes:

[0481] The broadcast unit is used to broadcast the first information to the second node.

[0482] In this embodiment of the application, the first node broadcasts first information to the second node. The first information is information sent by the first node to the second node so that the first node selects the second node for positioning based on the feedback from the second node, thereby enabling the selection of a node for sidelink positioning.

[0483] Optionally, the device further includes a third receiving unit for receiving second information sent by the second node.

[0484] Optionally, the third receiving unit is specifically used for:

[0485] When the first condition is met, the second information sent by the second node is received.

[0486] In this embodiment of the application, after the first node broadcasts first information to the second node, it receives second information sent by the second node. Through the information interaction between the first node and the second node, a node for sidelink positioning can be selected.

[0487] Optionally, the second information can be carried in different messages, and may include at least one of the following:

[0488] If the step of selecting the second node by the first node occurs during the process of establishing a connection between the first node and the second node, the Direct Communication Request message carries the second information;

[0489] If the step of selecting the second node by the first node occurs during the process of establishing a connection between the first node and the second node, the newly defined request message for establishing a PC5 unicast link carries the second information;

[0490] If the step of selecting the second node by the first node occurs during the process of establishing a connection between the first node and the second node, the security-related message established with the first node carries the second information.

[0491] If the second node does not need to establish a connection with the first node, the broadcast message other than the request message to establish a PC5 unicastlink carries the second information.

[0492] In the embodiments of this application, various methods for information exchange between the first node and the second node are provided, which improves the flexibility of selecting the node for sidelink positioning.

[0493] Optionally, the content of the first information includes at least one of the following:

[0494] First requirement;

[0495] Location-related information;

[0496] Information about the first node;

[0497] Request information about the second node.

[0498] In the embodiments of this application, the first information includes requirements for the second node and / or location-related information. Through the interaction of location-related information, it is possible to select a node for sidelink positioning.

[0499] Optionally, the first condition includes at least one of the following:

[0500] When the first information contains a first requirement, the second node satisfies the first requirement in the first information;

[0501] When the first information contains location-related information, the second node is interested in the location-related information in the first information.

[0502] Optionally, the content of the second information includes at least one of the following:

[0503] Zone information for the second node;

[0504] The RSRP value measured at the second node;

[0505] The movement status information of the second node;

[0506] Network coverage status of the second node;

[0507] The PC5 unicast link status of the second node;

[0508] The second node contains location-related capability information.

[0509] In this embodiment of the application, the second information includes Zone information, mobility status information, network coverage status, PC5unicast link status, and location-related capability information. Through the interaction of the second information, it is possible to select a node for sidelink positioning.

[0510] Optionally, the first requirement includes at least one of the following:

[0511] The capability requirements for the second node;

[0512] Reference signal received power (RSRP) threshold;

[0513] The Zone information requirements for the second node;

[0514] The movement status requirements of the second node;

[0515] Network coverage requirements for the second node;

[0516] The PC5 unicast link status requirement for the second node.

[0517] Optionally, the location-related information includes at least one of the following:

[0518] Positioning precision / accuracy;

[0519] The integrity of the positioning;

[0520] Type of positioning;

[0521] Location update cycle;

[0522] Positioning technology.

[0523] Optionally, the information of the first node or the information of the second node includes at least one of the following:

[0524] Zone information for the first or second node;

[0525] Movement status information;

[0526] Network coverage status;

[0527] PC5 unicast link status;

[0528] Location-related capability information.

[0529] Optionally, the capability requirements of the second node include at least one of the following:

[0530] It has absolute positioning capability;

[0531] It has relative positioning capabilities;

[0532] It has RAT-dependent positioning capabilities for wireless access technology;

[0533] It has independent RAT-independent positioning capabilities based on wireless access technology;

[0534] It has the ability to locate itself via a sidelink;

[0535] Positioning accuracy;

[0536] It possesses the ability to maintain its location integrity.

[0537] Optionally, the movement state requirements of the second node include at least one of the following:

[0538] It is in a static state;

[0539] In a moving state;

[0540] A stationary state takes precedence over a moving state.

[0541] Movement speed must not exceed the first threshold;

[0542] The movement speed is a value from the set;

[0543] Movement speed must not fall below the second threshold;

[0544] Movement speed level.

[0545] Optionally, the network coverage status requirements of the second node include at least one of the following:

[0546] The second node needs to be within the coverage area of ​​the base station;

[0547] The second node does not need to be within the coverage area of ​​the base station.

[0548] Optionally, the PC5 unicast link status of the second node requires at least one of the following:

[0549] A PC5 unicast link needs to be established with all terminals except the first node;

[0550] It is not necessary to have established PC5 unicast links with other terminals besides the first node;

[0551] The number of other terminals that have established PC5 unicast links is no less than the third threshold;

[0552] The number of other terminals that have already established a PC5 unicast link does not exceed the fourth threshold;

[0553] The set / range of other terminals that have established PC5 unicast links.

[0554] Optionally, the movement status information includes at least one of the following:

[0555] At rest or in motion;

[0556] Movement speed value;

[0557] Movement speed rating;

[0558] The movement speed is not lower than the fifth threshold and / or not higher than the sixth threshold;

[0559] The range of movement speed values.

[0560] Optionally, the network coverage status includes at least one of the following:

[0561] Within the coverage area of ​​the base station;

[0562] It is not within the coverage area of ​​the base station.

[0563] Optionally, the PC5 unicast link status includes at least one of the following:

[0564] A PC5 unicast link has been established with other terminals, or a PC5 unicast link has not been established with other terminals;

[0565] In the case of the PC5 unicast link state of the second node, it means that a PC5 unicast link has been established with other terminals besides the first node or a PC5 unicast link has not been established with other terminals besides the first node;

[0566] The number of other terminals that have already established a PC5 unicast link is no less than the seventh threshold;

[0567] In the case of the PC5 unicast link state of the second node, the number of other terminals besides the first node that have established PC5 unicast links is not less than the eighth threshold.

[0568] The number of other terminals that have already established a PC5 unicast link does not exceed the ninth threshold;

[0569] In the case of the PC5 unicast link state of the second node, the number of other terminals besides the first node that have established PC5 unicast links does not exceed the tenth threshold.

[0570] The set of other terminals that have already established PC5 unicast links;

[0571] In the case of the PC5 unicast link state of the second node, it is the set of the number of other terminals besides the first node that have established PC5 unicast links.

[0572] Optionally, the location-related capability information includes at least one of the following:

[0573] It has absolute positioning capability;

[0574] It has relative positioning capabilities;

[0575] It has RAT-dependent positioning capability;

[0576] It has RAT-independent positioning capability;

[0577] It has the ability to locate itself via a sidelink;

[0578] Positioning accuracy;

[0579] It possesses the ability to maintain its location integrity.

[0580] Optionally, the first node selects the second node, including:

[0581] The first node selects the second node according to the first rule;

[0582] The first rule is agreed upon by the protocol and / or depends on the implementation of the first node.

[0583] In this embodiment, the first node selects the second node according to the first rule, which can ensure that the selected node is effective for sidelink positioning.

[0584] Optionally, the device further includes a second transmitting unit for transmitting third information to the second node.

[0585] Optionally, the first node sends third information to the second node, including at least one of the following:

[0586] The first node sends a third message to the selected second node;

[0587] The first node sends a third message to the second node that was not selected.

[0588] Optionally, the third information includes at least one of the following:

[0589] In the case where the first node sends third information to the selected second node, the information is used to indicate that the second node was selected by the first node as a node for positioning;

[0590] In the event that the first node sends third information to the second node that has not been selected, the information is used to indicate that the second node has not been selected by the first node as a node for positioning.

[0591] Information used to indicate that the second node was not selected by the first node for positioning;

[0592] Information used to indicate that the second node was selected by the first node for positioning.

[0593] In this embodiment, after the first node selects the second node, it sends a notification message to the corresponding node, which can ensure the selection of the node used for sidelink positioning.

[0594] Optionally, the first node selecting the second node includes:

[0595] The first node selects the second node based on the first instruction information sent by the third node.

[0596] Optionally, the third node is at least one of the following:

[0597] Base station;

[0598] Core network functions.

[0599] In this embodiment, the terminal can directly select the second node according to the instructions of the base station and / or core network functions, which can conveniently achieve the selection of the node used for sidelink positioning.

[0600] Optionally, the number of the second node satisfies any of the following:

[0601] No restrictions;

[0602] There are limitations.

[0603] In this embodiment of the application, the first node can send first information to a limited number of second nodes and select at least one second node to achieve sidelink positioning.

[0604] The node selection device in this application embodiment can be a device, a device with an operating system, or an electronic device, or it can be a component, integrated circuit, or chip in a terminal. The device or electronic device can be a mobile terminal or a non-mobile terminal. For example, a mobile terminal can include, but is not limited to, the types of terminals 11 listed above, while a non-mobile terminal can be a server, network attached storage (NAS), personal computer (PC), television (TV), ATM, or self-service machine, etc. This application embodiment does not specifically limit the type of terminal.

[0605] The node selection device provided in this application embodiment can achieve... Figure 4 The various processes implemented by the method embodiment achieve the same technical effect and are not described here again to avoid repetition.

[0606] Figure 7 This is a second schematic diagram of the node selection device provided in an embodiment of this application. Figure 7 As shown, the node selection device 700 includes:

[0607] The fourth receiving unit 701 is used to receive the first information sent by the first node.

[0608] In this embodiment, the first information sent by the first node is received, and the second node is used to locate the first node. This solves the problem of how to select other nodes when a node has a positioning requirement. It can be applied to the method of positioning by sending and measuring positioning reference signals based on the sidelink between terminals to achieve sidelink positioning.

[0609] Optionally, the device further includes a third transmitting unit for transmitting second information to the first node.

[0610] Optionally, the third unit is specifically used for:

[0611] If the first condition is met, send the second information to the first node.

[0612] In this embodiment of the application, feeding back the second information to the first node enables the first node to determine whether to select the second node, thereby enabling the selection of the node used for sidelink positioning.

[0613] Optionally, the second node sends second information to the first node, including at least one of the following:

[0614] If the Direct Communication Request message carries the first information, the second node sends the second information to the first node via the Direct Communication Accept message;

[0615] When the newly defined request message for establishing a PC5 unicast link carries the first information, the second node sends the second information to the first node through the newly defined request message for responding to the establishment of a PC5 unicast link;

[0616] If the first information is carried in a security-related message established with the second node, the second node sends the second information to the first node through the security-related message established with the first node.

[0617] Optionally, the second node sends second information to the first node, including at least one of the following:

[0618] When the UECapabilityEnquirySidelink message carries the first information, the second node sends the second information to the first node through the UECapabilityInformationSidelink message.

[0619] When the RRCReconfigurationSidelink message carries the first information, the second node sends the second information to the first node through the RRCReconfigurationCompleteSidelink message.

[0620] If the Link Identifier Update Request message carries the first information, the second node sends the second information to the first node via the Link Identifier Update Response message;

[0621] If the Disconnect Request message carries the first information, the second node sends the second information to the first node via a Disconnect Response message;

[0622] If the Link Modification Request message carries the first information, the second node sends the second information to the first node via the Link Modification Accept message;

[0623] If the Keep-alive message carries the first information, the second node sends the second information to the first node via the Keep-aliveAck message;

[0624] When the newly defined PC5-RRC message carries the first information, the second node sends the second information to the first node through the newly defined PC5-RRC message.

[0625] When the newly defined PC5-S message carries the first information, the second node sends the second information to the first node through the newly defined PC5-S message.

[0626] Optionally, the second node sends second information to the first node via at least one of the following:

[0627] Direct Communication Request message;

[0628] The newly defined request message for establishing a PC5 unicast link;

[0629] Establish security-related messages with the first node;

[0630] Broadcast messages other than the request message to establish a PC5 unicast link.

[0631] In the embodiments of this application, various methods for information exchange between the first node and the second node are provided, which improves the flexibility of selecting the node for sidelink positioning.

[0632] Optionally, the content of the first information includes at least one of the following:

[0633] First requirement;

[0634] Location-related information;

[0635] Information about the first node;

[0636] Request information about the second node.

[0637] In the embodiments of this application, the first information includes requirements for the second node and / or location-related information. Through the interaction of location-related information, it is possible to select a node for sidelink positioning.

[0638] Optionally, the first condition includes at least one of the following:

[0639] When the first information contains a first requirement, the second node satisfies the first requirement in the first information;

[0640] When the first information contains location-related information, the second node is interested in the location-related information in the first information.

[0641] Optionally, the content of the second information includes at least one of the following:

[0642] Zone information for the second node;

[0643] The RSRP value measured at the second node;

[0644] The movement status information of the second node;

[0645] Network coverage status of the second node;

[0646] The PC5 unicast link status of the second node;

[0647] The second node contains location-related capability information.

[0648] In this embodiment of the application, the second information includes Zone information, mobility status information, network coverage status, PC5unicast link status, and location-related capability information. Through the interaction of the second information, it is possible to select a node for sidelink positioning.

[0649] The node selection device in this application embodiment can be a device, a device with an operating system, or an electronic device, or it can be a component, integrated circuit, or chip in a terminal. The device or electronic device can be a mobile terminal or a non-mobile terminal. For example, a mobile terminal can include, but is not limited to, the types of terminals 11 listed above, while a non-mobile terminal can be a server, network attached storage (NAS), personal computer (PC), television (TV), ATM, or self-service machine, etc. This application embodiment does not specifically limit the type of terminal.

[0650] The node selection device provided in this application embodiment can achieve... Figure 5 The various processes implemented by the method embodiment achieve the same technical effect and are not described here again to avoid repetition.

[0651] Optional, such as Figure 8 As shown, this application embodiment also provides a communication device 800, including a processor 801, a memory 802, and a program or instructions stored in the memory 802 and executable on the processor 801. For example, when the communication device 800 is a terminal, the program or instructions executed by the processor 801 implement the various processes of the above-described node selection method embodiment and achieve the same technical effect. When the communication device 800 is a network-side device, the program or instructions executed by the processor 801 implement the various processes of the above-described node selection method embodiment and achieve the same technical effect; to avoid repetition, further details are omitted here.

[0652] This application embodiment also provides a terminal, including a processor and a communication interface, wherein the processor is used to select a second node; wherein the second node is used to locate the first node. This terminal embodiment corresponds to the above-described terminal-side method embodiment, and all implementation processes and methods of the above-described method embodiments can be applied to this terminal embodiment and achieve the same technical effect. Specifically, Figure 9 A schematic diagram of the hardware structure of a terminal to implement an embodiment of this application.

[0653] The terminal 900 includes, but is not limited to, at least some of the following components: radio frequency unit 901, network module 902, audio output unit 903, input unit 904, sensor 905, display unit 906, user input unit 907, interface unit 908, memory 909, and processor 910.

[0654] Those skilled in the art will understand that the terminal 900 may also include a power supply (such as a battery) for supplying power to various components. The power supply may be logically connected to the processor 910 through a power management system, thereby enabling functions such as managing charging, discharging, and power consumption through the power management system. Figure 9 The terminal structure shown does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown, or combine certain components, or have different component arrangements, which will not be elaborated here.

[0655] It should be understood that, in this embodiment, the input unit 904 may include a graphics processing unit (GPU) 9041 and a microphone 9042. The GPU 9041 processes image data of still images or videos obtained by an image capture device (such as a camera) in video capture mode or image capture mode. The display unit 906 may include a display panel 9061, which may be configured in the form of a liquid crystal display, an organic light-emitting diode, or the like. The user input unit 907 includes a touch panel 9071 and other input devices 9072. The touch panel 9071 is also called a touch screen. The touch panel 9071 may include a touch detection device and a touch controller. Other input devices 9072 may include, but are not limited to, physical keyboards, function keys (such as volume control buttons, power buttons, etc.), trackballs, mice, and joysticks, which will not be described in detail here.

[0656] In this embodiment, the radio frequency unit 901 receives downlink data from the network-side device and processes it for the processor 910; additionally, it sends uplink data to the network-side device. Typically, the radio frequency unit 901 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, etc.

[0657] The memory 909 can be used to store software programs or instructions and various data. The memory 909 may primarily include a program or instruction storage area and a data storage area. The program or instruction storage area may store the operating system, application programs or instructions required for at least one function (such as sound playback, image playback, etc.). Furthermore, the memory 909 may include high-speed random access memory and non-volatile memory, which may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. For example, at least one disk storage device, flash memory device, or other non-volatile solid-state storage device.

[0658] Processor 910 may include one or more processing units; optionally, processor 910 may integrate an application processor and a modem processor, wherein the application processor mainly handles the operating system, user interface, and applications or instructions, and the modem processor mainly handles wireless communication, such as a baseband processor. It is understood that the aforementioned modem processor may also not be integrated into processor 910.

[0659] The processor 910 is used to select a second node; the second node is used to locate the first node.

[0660] In this embodiment, the first node selects the second node, which is used to perform positioning with the first node. This solves the problem of how to select other nodes when a node has a positioning requirement. It can be applied to the method of positioning by sending and measuring positioning reference signals based on the sidelink between terminals to achieve sidelink positioning.

[0661] Optionally, the second node includes at least one of the following:

[0662] Nodes that do not need to establish a connection with the first node;

[0663] The node that needs to establish a connection with the first node.

[0664] Optionally, if the second node is a node that needs to establish a connection with the first node, the step of the first node selecting the second node occurs during the process of establishing a connection between the first node and the second node, and / or occurs after the process of establishing a connection between the first node and the second node.

[0665] Optionally, the first node includes at least one of the following:

[0666] terminal;

[0667] Base station;

[0668] Core network functions;

[0669] The second node includes at least one of the following:

[0670] terminal;

[0671] Base station;

[0672] Core network functions.

[0673] Optionally, establishing a connection between the first node and the second node includes one of the following:

[0674] When one of the first node and the second node is a terminal and the other is a base station, a Radio Resource Control (RRC) connection is established between the first node and the second node;

[0675] When both the first node and the second node are terminals, a PC5 unicast link connection is established between the first node and the second node; and / or, when both the first node and the second node are terminals, a PC5-RRC connection is established between the first node and the second node.

[0676] When one of the first node and the second node is a terminal and the other is a core network function, a non-access stratum (NAS) connection is established between the first node and the second node.

[0677] Optionally, the PC5 unicast link connection established between the first node and the second node includes at least one of the following:

[0678] The first node sends a request message to the second node to establish a PC5 unicast link via PC5 broadcast;

[0679] The first node sends a request message to the second node to establish a PC5 unicast link via PC5 unicast.

[0680] Optionally, if the step of the first node selecting the second node occurs during the process of establishing a connection between the first node and the second node, the request message for establishing the PC5 unicast link carries the first information.

[0681] In this embodiment of the application, the first node selects the second node during the process of establishing a PC5 unicast link connection between the first node and the second node. The first node sends first information to the second node so that the first node selects the second node based on the feedback from the second node. The first information is carried in the request message for establishing the PC5 unicast link, which enables the selection of the node used for sidelink positioning.

[0682] Optionally, the radio frequency unit 901 is used to receive second information sent by the second node;

[0683] Optionally, the radio frequency unit 901 is specifically used for:

[0684] If the first condition is met, the second information sent by the second node is received.

[0685] In this embodiment of the application, the first node can determine whether to select the second node based on the receipt of the second information, thereby enabling the selection of the node used for sidelink positioning.

[0686] Optionally, the request message to establish a PC5 unicast link includes at least one of the following:

[0687] Direct Communication Request message;

[0688] The newly defined request message for establishing a PC5 unicast link;

[0689] Establish security-related messages with the second node.

[0690] Optionally, the second information can be carried in different messages, and may include at least one of the following:

[0691] When the request message for establishing the PC5 unicast link is a Direct Communication Request message, the Direct Communication Accept message carries the second information;

[0692] If the request message for establishing a PC5 unicast link is a newly defined request message for establishing a PC5 unicast link, the newly defined request message for responding to the request message for establishing a PC5 unicast link carries the second information;

[0693] In the case that the request message for establishing a PC5 unicast link is a security-related message for the second node, the security-related message for the first node carries the second information.

[0694] In the embodiments of this application, various methods for information exchange between the first node and the second node are provided, which can improve the flexibility of selecting the node for positioning with the first node.

[0695] Optionally, if the step of the first node selecting the second node occurs after the process of establishing a connection between the first node and the second node, the radio frequency unit 901 is further configured to send first information to the second node.

[0696] In this embodiment of the application, after the first node and the second node establish a connection, the first node sends first information to the second node. The first information is information sent by the first node to the second node so that the first node can select the second node for positioning based on the feedback from the second node, thereby enabling the selection of a node for sidelink positioning.

[0697] Optionally, the radio frequency unit 901 is further configured to receive second information sent by the second node;

[0698] Optionally, the radio frequency unit 901 is specifically used for:

[0699] If the first condition is met, the second information sent by the second node is received.

[0700] In this embodiment of the application, the node used for sidelink positioning can be selected through the interaction of the second information.

[0701] Optionally, the first node sends the first information to the second node through at least one of the following:

[0702] UECapabilityEnquirySidelink message;

[0703] RRCReconfigurationSidelink message;

[0704] Link Identifier Update Request message;

[0705] Link Identifier Update Ack message;

[0706] Disconnect Request message;

[0707] Link Modification Request message;

[0708] Keep-alive messages;

[0709] The newly defined PC5-RRC message;

[0710] The newly defined PC5-S message.

[0711] Optionally, the second information can be carried in different messages, and may include at least one of the following:

[0712] When the first node sends the first information to the second node via the UECapabilityEnquirySidelink message, the UECapabilityInformationSidelink message carries the second information.

[0713] When the first node sends the first information to the second node via the RRCReconfigurationSidelink message, the RRCReconfigurationCompleteSidelink message carries the second information.

[0714] When the first node sends the first information to the second node via a Link Identifier Update Request message, the Link Identifier Update Response message carries the second information;

[0715] When the first node sends the first information to the second node via a Disconnect Request message, the Disconnect Response message carries the second information;

[0716] When the first node sends the first information to the second node via a Link Modification Request message, the Link Modification Accept message carries the second information;

[0717] When the first node sends the first information to the second node via a Keep-alive message, the Keep-alive Ack message carries the second information.

[0718] When the first node sends the first information to the second node through the newly defined PC5-RRC message, the newly defined PC5-RRC message carries the second information;

[0719] When the first node sends the first information to the second node through the newly defined PC5-S message, the newly defined PC5-S message carries the second information.

[0720] In the embodiments of this application, various methods for information exchange between the first node and the second node are provided, which can improve the flexibility of selecting the node for sidelink positioning.

[0721] Optionally, when the step of the first node selecting the second node occurs during the process of establishing a connection between the first node and the second node, or when the second node does not need to establish a connection with the first node, the radio frequency unit 901 is further configured to:

[0722] Broadcast the first message to the second node.

[0723] In this embodiment of the application, the first node broadcasts first information to the second node. The first information is information sent by the first node to the second node so that the first node selects the second node for positioning based on the feedback from the second node, thereby enabling the selection of a node for sidelink positioning.

[0724] Optionally, the radio frequency unit 901 is further configured to receive second information sent by the second node;

[0725] When the first condition is met, receive the second information sent by the second node.

[0726] Optionally, the radio frequency unit 901 is specifically used for:

[0727] When the first condition is met, the second information sent by the second node is received.

[0728] In this embodiment of the application, after the first node broadcasts the first information to the second node, it receives the second information sent by the second node. Through the information interaction between the first node and the second node, the node used for sidelink positioning can be selected.

[0729] Optionally, the second information can be carried in different messages, and may include at least one of the following:

[0730] If the step of selecting the second node by the first node occurs during the process of establishing a connection between the first node and the second node, the Direct Communication Request message carries the second information;

[0731] If the step of selecting the second node by the first node occurs during the process of establishing a connection between the first node and the second node, the newly defined request message for establishing a PC5 unicast link carries the second information;

[0732] If the step of selecting the second node by the first node occurs during the process of establishing a connection between the first node and the second node, the security-related message established with the first node carries the second information.

[0733] If the second node does not need to establish a connection with the first node, the broadcast message other than the request message to establish a PC5 unicastlink carries the second information.

[0734] In the embodiments of this application, various methods for information exchange between the first node and the second node are provided, which improves the flexibility of selecting the node for sidelink positioning.

[0735] Optionally, the content of the first information includes at least one of the following:

[0736] First requirement;

[0737] Location-related information;

[0738] Information about the first node;

[0739] Request information about the second node.

[0740] In the embodiments of this application, the first information includes requirements for the second node and / or location-related information. Through the interaction of location-related information, it is possible to select a node for sidelink positioning.

[0741] Optionally, the first condition includes at least one of the following:

[0742] When the first information contains a first requirement, the second node satisfies the first requirement in the first information;

[0743] When the first information contains location-related information, the second node is interested in the location-related information in the first information.

[0744] Optionally, the content of the second information includes at least one of the following:

[0745] Zone information for the second node;

[0746] The RSRP value measured at the second node;

[0747] The movement status information of the second node;

[0748] Network coverage status of the second node;

[0749] The PC5 unicast link status of the second node;

[0750] The second node contains location-related capability information.

[0751] In this embodiment of the application, the second information includes Zone information, mobility status information, network coverage status, PC5unicast link status, and location-related capability information. Through the interaction of the second information, it is possible to select a node for sidelink positioning.

[0752] Optionally, the first requirement includes at least one of the following:

[0753] The capability requirements for the second node;

[0754] Reference signal received power (RSRP) threshold;

[0755] The Zone information requirements for the second node;

[0756] The movement status requirements of the second node;

[0757] Network coverage requirements for the second node;

[0758] The PC5 unicast link status requirement for the second node.

[0759] Optionally, the location-related information includes at least one of the following:

[0760] Positioning precision / accuracy;

[0761] The integrity of the positioning;

[0762] Type of positioning;

[0763] Location update cycle;

[0764] Positioning technology.

[0765] Optionally, the information of the first node or the information of the second node includes at least one of the following:

[0766] Zone information for the first or second node;

[0767] Movement status information;

[0768] Network coverage status;

[0769] PC5 unicast link status;

[0770] Location-related capability information.

[0771] Optionally, the capability requirements of the second node include at least one of the following:

[0772] It has absolute positioning capability;

[0773] It has relative positioning capabilities;

[0774] It has RAT-dependent positioning capabilities for wireless access technology;

[0775] It has independent RAT-independent positioning capabilities based on wireless access technology;

[0776] It has the ability to locate itself via a sidelink;

[0777] Positioning accuracy;

[0778] It possesses the ability to maintain its location integrity.

[0779] Optionally, the movement state requirements of the second node include at least one of the following:

[0780] It is in a static state;

[0781] In a moving state;

[0782] A stationary state takes precedence over a moving state.

[0783] Movement speed must not exceed the first threshold;

[0784] The movement speed is a value from the set;

[0785] Movement speed must not fall below the second threshold;

[0786] Movement speed level.

[0787] Optionally, the network coverage status requirements of the second node include at least one of the following:

[0788] The second node needs to be within the coverage area of ​​the base station;

[0789] The second node does not need to be within the coverage area of ​​the base station.

[0790] Optionally, the PC5 unicast link status of the second node requires at least one of the following:

[0791] A PC5 unicast link needs to be established with all terminals except the first node;

[0792] It is not necessary to have established PC5 unicast links with other terminals besides the first node;

[0793] The number of other terminals that have established PC5 unicast links is no less than the third threshold;

[0794] The number of other terminals that have already established a PC5 unicast link does not exceed the fourth threshold;

[0795] The set / range of other terminals that have established PC5 unicast links.

[0796] Optionally, the movement status information includes at least one of the following:

[0797] At rest or in motion;

[0798] Movement speed value;

[0799] Movement speed rating;

[0800] The movement speed is not lower than the fifth threshold and / or not higher than the sixth threshold;

[0801] The range of movement speed values.

[0802] Optionally, the network coverage status includes at least one of the following:

[0803] Within the coverage area of ​​the base station;

[0804] It is not within the coverage area of ​​the base station.

[0805] Optionally, the PC5 unicast link status includes at least one of the following:

[0806] A PC5 unicast link has been established with other terminals, or a PC5 unicast link has not been established with other terminals;

[0807] In the case of the PC5 unicast link state of the second node, it means that a PC5 unicast link has been established with other terminals besides the first node or a PC5 unicast link has not been established with other terminals besides the first node;

[0808] The number of other terminals that have already established a PC5 unicast link is no less than the seventh threshold;

[0809] In the case of the PC5 unicast link state of the second node, the number of other terminals besides the first node that have established PC5 unicast links is not less than the eighth threshold.

[0810] The number of other terminals that have already established a PC5 unicast link does not exceed the ninth threshold;

[0811] In the case of the PC5 unicast link state of the second node, the number of other terminals besides the first node that have established PC5 unicast links does not exceed the tenth threshold.

[0812] The set of other terminals that have already established PC5 unicast links;

[0813] In the case of the PC5 unicast link state of the second node, it is the set of the number of other terminals besides the first node that have established PC5 unicast links.

[0814] Optionally, the location-related capability information includes at least one of the following:

[0815] It has absolute positioning capability;

[0816] It has relative positioning capabilities;

[0817] It has RAT-dependent positioning capability;

[0818] It has RAT-independent positioning capability;

[0819] It has the ability to locate itself via a sidelink;

[0820] Positioning accuracy;

[0821] It possesses the ability to maintain its location integrity.

[0822] Optionally, the first node selects the second node, including:

[0823] The first node selects the second node according to the first rule;

[0824] The first rule is agreed upon by the protocol and / or depends on the implementation of the first node.

[0825] In this embodiment of the application, the first node selects the second node according to the first rule, which can ensure the effectiveness of selecting the node that is located with the first node.

[0826] Optionally, the radio frequency unit 901 is further configured to perform at least one of the following:

[0827] Send the third message to the second node.

[0828] Optionally, the first node sends third information to the second node, including at least one of the following:

[0829] The first node sends a third message to the selected second node;

[0830] The first node sends a third message to the second node that was not selected.

[0831] Optionally, the third information includes at least one of the following:

[0832] In the case where the first node sends third information to the selected second node, the information is used to indicate that the second node was selected by the first node as a node for positioning;

[0833] In the event that the first node sends third information to the second node that has not been selected, the information is used to indicate that the second node has not been selected by the first node as a node for positioning.

[0834] Information used to indicate that the second node was not selected by the first node for positioning;

[0835] Information used to indicate that the second node was selected by the first node for positioning.

[0836] In this embodiment, after the first node selects the second node, it sends a notification message to the corresponding node, which can ensure the effectiveness of selecting the node used for sidelink positioning.

[0837] Optionally, the first node selecting the second node includes:

[0838] The first node selects the second node based on the first instruction information sent by the third node.

[0839] Optionally, the third node is at least one of the following:

[0840] Base station;

[0841] Core network functions.

[0842] In the embodiments of this application, the terminal can directly select the second node according to the instructions of the base station and / or core network functions, which can conveniently realize the selection of the node used for sidelink positioning.

[0843] Optionally, the number of the second node satisfies any of the following:

[0844] No restrictions;

[0845] There are limitations.

[0846] In this embodiment of the application, the first node can send first information to a limited number of second nodes and select at least one second node to achieve sidelink positioning.

[0847] This application embodiment also provides a terminal, including a processor and a communication interface, wherein the communication interface is used to receive first information sent by a first node. This terminal embodiment corresponds to the above-described terminal-side method embodiment, and all implementation processes and methods of the above method embodiments can be applied to this terminal embodiment and achieve the same technical effect. Specifically, as Figure 9 The terminal shown includes a radio frequency unit 901 for receiving first information sent by the first node.

[0848] In this embodiment, the first information sent by the first node is received, and the second node is a node used to locate the first node. This solves the problem of how to select other nodes when a node has a positioning requirement. It can be applied to the method of positioning reference signal transmission and measurement based on sidelink between terminals to achieve sidelink positioning.

[0849] Optionally, the radio frequency unit 901 is also used to send second information to the first node.

[0850] Optionally, the radio frequency unit 901 is specifically used to send second information to the first node when the first condition is met.

[0851] In this embodiment of the application, feeding back the second information to the first node enables the first node to determine whether to select the second node, thereby enabling the selection of the node used for sidelink positioning.

[0852] Optionally, the second node sends second information to the first node, including at least one of the following:

[0853] If the Direct Communication Request message carries the first information, the second node sends the second information to the first node via the Direct Communication Accept message;

[0854] When the newly defined request message for establishing a PC5 unicast link carries the first information, the second node sends the second information to the first node through the newly defined request message for responding to the establishment of a PC5 unicast link;

[0855] If the first information is carried in a security-related message established with the second node, the second node sends the second information to the first node through the security-related message established with the first node.

[0856] Optionally, the second node sends second information to the first node, including at least one of the following:

[0857] When the UECapabilityEnquirySidelink message carries the first information, the second node sends the second information to the first node through the UECapabilityInformationSidelink message.

[0858] When the RRCReconfigurationSidelink message carries the first information, the second node sends the second information to the first node through the RRCReconfigurationCompleteSidelink message.

[0859] If the Link Identifier Update Request message carries the first information, the second node sends the second information to the first node via the Link Identifier Update Response message;

[0860] If the Disconnect Request message carries the first information, the second node sends the second information to the first node via a Disconnect Response message;

[0861] If the Link Modification Request message carries the first information, the second node sends the second information to the first node via the Link Modification Accept message;

[0862] If the Keep-alive message carries the first information, the second node sends the second information to the first node via the Keep-aliveAck message;

[0863] When the newly defined PC5-RRC message carries the first information, the second node sends the second information to the first node through the newly defined PC5-RRC message.

[0864] When the newly defined PC5-S message carries the first information, the second node sends the second information to the first node through the newly defined PC5-S message.

[0865] Optionally, the second node sends second information to the first node via at least one of the following:

[0866] Direct Communication Request message;

[0867] The newly defined request message for establishing a PC5 unicast link;

[0868] Establish security-related messages with the first node;

[0869] Broadcast messages other than the request message to establish a PC5 unicast link.

[0870] In the embodiments of this application, various methods for information exchange between the first node and the second node are provided, which improves the flexibility of selecting the node for sidelink positioning.

[0871] Optionally, the content of the first information includes at least one of the following:

[0872] First requirement;

[0873] Location-related information;

[0874] Information about the first node;

[0875] Request information about the second node.

[0876] In the embodiments of this application, the first information includes requirements for the second node and / or location-related information. Through the interaction of location-related information, it is possible to select a node for sidelink positioning.

[0877] Optionally, the first condition includes at least one of the following:

[0878] When the first information contains a first requirement, the second node satisfies the first requirement in the first information;

[0879] When the first information contains location-related information, the second node is interested in the location-related information in the first information.

[0880] Optionally, the content of the second information includes at least one of the following:

[0881] Zone information for the second node;

[0882] The RSRP value measured at the second node;

[0883] The movement status information of the second node;

[0884] Network coverage status of the second node;

[0885] The PC5 unicast link status of the second node;

[0886] The second node contains location-related capability information.

[0887] In this embodiment of the application, the second information includes Zone information, mobility status information, network coverage status, PC5unicast link status, and location-related capability information. Through the interaction of the second information, it is possible to select a node for sidelink positioning.

[0888] This application also provides a network-side device, including a processor and a communication interface, wherein the processor is used to select a second node; wherein the second node is used to locate the first node. This network-side device embodiment corresponds to the above-described network-side device method embodiment, and all implementation processes and methods of the above method embodiments can be applied to this network-side device embodiment and achieve the same technical effect.

[0889] Alternatively, this application embodiment also provides a network-side device, including a processor and a communication interface, wherein the communication interface is used to receive first information sent by a first node. This network-side device embodiment corresponds to the above-described network-side device method embodiment, and all implementation processes and methods of the above method embodiments can be applied to this network-side device embodiment and achieve the same technical effect.

[0890] Specifically, embodiments of this application also provide a network-side device. For example... Figure 10 As shown, the network device 1000 includes: an antenna 1001, a radio frequency (RF) device 1002, and a baseband device 1003. The antenna 1001 is connected to the RF device 1002. In the uplink direction, the RF device 1002 receives information through the antenna 1001 and transmits the received information to the baseband device 1003 for processing. In the downlink direction, the baseband device 1003 processes the information to be transmitted and sends it to the RF device 1002. The RF device 1002 processes the received information and transmits it through the antenna 1001.

[0891] The aforementioned frequency band processing device can be located in the baseband device 1003. The method executed by the network-side device in the above embodiments can be implemented in the baseband device 1003, which includes a processor 1004 and a memory 1005.

[0892] The baseband device 1003 may include, for example, at least one baseband board on which multiple chips are disposed, such as... Figure 10 As shown, one of the chips, for example, is a processor 1004, which is connected to a memory 1005 to call the program in the memory 1005 and execute the network device operation shown in the above method embodiment.

[0893] The baseband device 1003 may also include a network interface 1006 for exchanging information with the radio frequency device 1002, such as a common public radio interface (CPRI).

[0894] Specifically, the network-side device in this embodiment of the invention further includes: instructions or programs stored in memory 1005 and executable on processor 1004, wherein processor 1004 calls the instructions or programs in memory 1005 to execute... Figure 6 or Figure 7 The methods executed by each module shown achieve the same technical effect, and to avoid repetition, they will not be described in detail here.

[0895] Specifically, embodiments of this application also provide a network-side device. For example... Figure 11 As shown, the network device 1100 includes: a processor 1101, a transceiver 1102, a memory 1103, a user interface 1104, and a bus interface, wherein:

[0896] In this embodiment of the invention, the network-side device 1100 further includes: a computer program stored on a memory 1103 and executable on a processor 1101, the computer program being executed by the processor 1101. Figure 6 or Figure 7 The methods executed by each module shown achieve the same technical effect, and to avoid repetition, they will not be described in detail here.

[0897] exist Figure 11 In this context, the bus architecture can include any number of interconnected buses and bridges, specifically linking various circuits together, represented by one or more processors (processor 1101) and memory (memory 1103). The bus architecture can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. The bus interface provides an interface. The transceiver 1102 can be multiple elements, including transmitters and receivers, providing a unit for communicating with various other devices over a transmission medium. For different user equipment, the user interface 1104 can also be an interface capable of connecting external or internal devices, including but not limited to keypads, displays, speakers, microphones, joysticks, etc.

[0898] The processor 1101 is responsible for managing the bus architecture and general processing, and the memory 1103 can store the data used by the processor 1101 when performing operations.

[0899] This application also provides a readable storage medium storing a program or instructions. When the program or instructions are executed by a processor, they implement the various processes of the above-described node selection method embodiments and achieve the same technical effect. To avoid repetition, they will not be described again here.

[0900] The processor mentioned above is the processor in the terminal described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0901] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the various processes of the above-described node selection method embodiments and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0902] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0903] This application also provides a computer program / program product, which is stored in a non-transient storage medium. The program / program product is executed by at least one processor to implement the various processes of the above-described system message reporting method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0904] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0905] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0906] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A node selection method, characterized in that, include: The first node selects the second node; wherein the second node is used to locate the first node. When the second node is a node that needs to establish a connection with the first node, the step of the first node selecting the second node occurs during the process of establishing a connection between the first node and the second node.

2. The node selection method according to claim 1, characterized in that, The first node is at least one of the following: terminal; Base station; Core network functions; The second node is at least one of the following: terminal; Base station; Core network functions.

3. The node selection method according to claim 1, characterized in that, Establishing a connection between the first node and the second node includes the following: When one of the first node and the second node is a terminal and the other is a base station, a Radio Resource Control (RRC) connection is established between the first node and the second node; When both the first node and the second node are terminals, a PC5 unicast link connection is established between the first node and the second node. And / or, when both the first node and the second node are terminals, a PC5-RRC connection is established between the first node and the second node; When one of the first node and the second node is a terminal and the other is a core network function, a non-access stratum (NAS) connection is established between the first node and the second node.

4. The node selection method according to claim 3, characterized in that, The establishment of a PC5 unicast link connection between the first node and the second node includes at least one of the following: The first node sends a request message to the second node to establish a PC5 unicast link via PC5 broadcast; The first node sends a request message to the second node to establish a PC5 unicast link via PC5 unicast.

5. The node selection method according to claim 4, characterized in that, If the step of selecting the second node by the first node occurs during the process of establishing a connection between the first node and the second node, the request message for establishing the PC5 unicast link carries the first information.

6. The node selection method according to claim 5, characterized in that, Following the step of sending the request message to the second node to establish the PC5 unicast link, the method further includes: The first node receives the second information sent by the second node.

7. The method according to claim 6, characterized in that, The first node receives the second information sent by the second node, specifically including: If the first condition is met, the first node receives the second information sent by the second node.

8. The method according to any one of claims 5-7, characterized in that, The request message to establish a PC5 unicast link includes at least one of the following: Direct Communication Request message; The newly defined request message for establishing a PC5 unicast link; Establish security-related messages with the second node.

9. The node selection method according to claim 6 or 7, characterized in that, Includes at least one of the following: When the request message for establishing the PC5 unicast link is a Direct Communication Request message, the Direct Communication Accept message carries the second information; If the request message for establishing a PC5 unicast link is a newly defined request message for establishing a PC5 unicast link, the newly defined request message for responding to the request message for establishing a PC5 unicast link carries the second information; In the case that the request message for establishing a PC5 unicast link is a security-related message for the second node, the security-related message for the first node carries the second information.

10. The node selection method according to claim 1, characterized in that, When the step of selecting the second node by the first node occurs during the process of establishing a connection between the first node and the second node, the method further includes: The first node broadcasts the first information to the second node.

11. The node selection method according to claim 10, characterized in that, After the step of the first node broadcasting the first information to the second node, the method further includes at least one of the following: The first node receives the second information sent by the second node.

12. The node selection method according to claim 11, characterized in that, The first node receives the second information sent by the second node, specifically including: If the first condition is met, the first node receives the second information sent by the second node.

13. The node selection method according to claim 11 or 12, characterized in that, Includes at least one of the following: If the step of selecting the second node by the first node occurs during the process of establishing a connection between the first node and the second node, the Direct Communication Request message carries the second information; If the step of selecting the second node by the first node occurs during the process of establishing a connection between the first node and the second node, the newly defined request message for establishing a PC5 unicast link carries the second information; If the step of selecting the second node by the first node occurs during the process of establishing a connection between the first node and the second node, the message related to establishing security with the first node carries the second information.

14. The node selection method according to any one of claims 5-7 and 10-12, characterized in that, The content of the first information includes at least one of the following: First requirement; Location-related information; Information about the first node; Request information about the second node.

15. The node selection method according to claim 7 or 12, characterized in that, The first condition includes at least one of the following: When the first information contains a first requirement, the second node satisfies the first requirement in the first information; When the first information contains location-related information, the second node is interested in the location-related information in the first information.

16. The node selection method according to any one of claims 6-7, 9, and 11-12, characterized in that, The content of the second information includes at least one of the following: Zone information for the second node; The RSRP value measured at the second node; The movement status information of the second node; Network coverage status of the second node; The PC5 unicast link status of the second node; The second node contains location-related capability information.

17. The node selection method according to claim 14, characterized in that, The first requirement includes at least one of the following: The capability requirements for the second node; Reference signal received power (RSRP) threshold; The Zone information requirements for the second node; The movement status requirements of the second node; Network coverage requirements for the second node; The PC5 unicast link status requirement for the second node.

18. The node selection method according to claim 14, characterized in that, The location-related information includes at least one of the following: Positioning precision / accuracy; The integrity of the positioning; Type of positioning; Location update cycle; Positioning technology.

19. The node selection method according to claim 14, characterized in that, The information of the first node or the information of the second node includes at least one of the following: Zone information for the first or second node; Movement status information; Network coverage status; PC5 unicast link status; Location-related capability information.

20. The node selection method according to claim 17, characterized in that, The capability requirements of the second node include at least one of the following: It has absolute positioning capability; It has relative positioning capabilities; It has RAT-dependent positioning capabilities for wireless access technology; It has independent RAT-independent positioning capabilities based on wireless access technology; It has the ability to locate itself via a sidelink; Positioning accuracy; It possesses the ability to maintain its location integrity.

21. The node selection method according to claim 17, characterized in that, The movement state requirements of the second node include at least one of the following: It is in a static state; In a moving state; A stationary state takes precedence over a moving state. Movement speed must not exceed the first threshold; The movement speed is a value from the set; Movement speed must not fall below the second threshold; Movement speed level.

22. The node selection method according to claim 17, characterized in that, The network coverage status requirements for the second node include at least one of the following: The second node needs to be within the coverage area of ​​the base station; The second node does not need to be within the coverage area of ​​the base station.

23. The node selection method according to claim 18, characterized in that, The PC5 unicastlink status requirements for the second node include at least one of the following: A PC5 unicast link needs to be established with all terminals except the first node; It is not necessary to have established PC5 unicast links with other terminals besides the first node; The number of other terminals that have established PC5 unicast links is no less than the third threshold; The number of other terminals that have already established a PC5 unicast link does not exceed the fourth threshold; The set / range of other terminals that have established PC5 unicast links.

24. The node selection method according to claim 19, characterized in that, The mobility status information includes at least one of the following: At rest or in motion; Movement speed value; Movement speed rating; The movement speed is not lower than the fifth threshold and / or not higher than the sixth threshold; The range of movement speed values.

25. The node selection method according to claim 19, characterized in that, The network coverage status includes at least one of the following: Within the coverage area of ​​the base station; It is not within the coverage area of ​​the base station.

26. The node selection method according to claim 19, characterized in that, The PC5 unicast link status includes at least one of the following: A PC5 unicast link has been established with other terminals, or a PC5 unicast link has not been established with other terminals; In the case of the PC5 unicast link state of the second node, it means that a PC5 unicast link has been established with other terminals besides the first node or a PC5 unicast link has not been established with other terminals besides the first node. The number of other terminals that have already established a PC5 unicast link is no less than the seventh threshold; In the case of the PC5 unicast link state of the second node, the number of other terminals besides the first node that have established PC5 unicast links is not less than the eighth threshold. The number of other terminals that have already established a PC5 unicast link does not exceed the ninth threshold; In the case of the PC5 unicast link state of the second node, the number of other terminals besides the first node that have established PC5 unicast links does not exceed the tenth threshold. The set of other terminals that have already established PC5 unicast links; In the case of the PC5 unicast link state of the second node, it is the set of the number of other terminals besides the first node that have established PC5 unicast links.

27. The node selection method according to claim 19, characterized in that, The location-related capability information includes at least one of the following: It has absolute positioning capability; It has relative positioning capabilities; It has RAT-dependent positioning capability; It has RAT-independent positioning capability; It has the ability to locate itself via a sidelink; Positioning accuracy; It possesses the ability to maintain its location integrity.

28. The node selection method according to any one of claims 1, 3-7, 10-12, and 19-23, characterized in that, The first node selects the second node, including: The first node selects the second node according to the first rule; The first rule is agreed upon by the protocol and / or depends on the implementation of the first node.

29. The node selection method according to claim 28, characterized in that, Following the step of selecting the second node from the first node, the process also includes: The first node sends a third message to the second node.

30. The node selection method according to claim 29, characterized in that, The first node sends third information to the second node, including at least one of the following: The first node sends a third message to the selected second node; The first node sends a third message to the second node that was not selected.

31. The node selection method according to claim 29 or 30, characterized in that, The third information includes at least one of the following: In the case where the first node sends third information to the selected second node, the information is used to indicate that the second node was selected by the first node as a node for positioning; In the event that the first node sends third information to the second node that has not been selected, the information is used to indicate that the second node has not been selected by the first node as a node for positioning. Information used to indicate that the second node was not selected by the first node for positioning; Information used to indicate that the second node was selected by the first node for positioning.

32. The node selection method according to claim 1, characterized in that, The first node selects the second node, including: The first node selects the second node based on the first instruction information sent by the third node.

33. The node selection method according to claim 32, characterized in that, The third node is any one of the following: Base station; Core network functions.

34. The node selection method according to claim 1, wherein the number of the second nodes satisfies any one of the following: No restrictions; There are limitations.

35. A node selection device, characterized in that, include: The selection unit is used to select a second node; wherein the second node is used to locate the first node. When the second node is a node that needs to establish a connection with the first node, the step of the first node selecting the second node occurs during the process of establishing a connection between the first node and the second node.

36. A terminal, characterized in that, It includes a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the node selection method as described in any one of claims 1 to 34.

37. A network-side device, characterized in that, It includes a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the node selection method as described in any one of claims 1 to 34.

38. A readable storage medium, characterized in that, The readable storage medium stores a program or instructions that, when executed by a processor, implement the steps of the node selection method as described in any one of claims 1 to 34.

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