CN115529858A

CN115529858A - Method and device for determining synchronous reference source

Info

Publication number: CN115529858A
Application number: CN202280002650.2A
Authority: CN
Inventors: 江小威
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2022-07-29
Filing date: 2022-07-29
Publication date: 2022-12-27
Also published as: WO2024021128A1

Abstract

The embodiment of the application discloses a method and a device for determining a synchronous reference source, wherein a target synchronous reference source of a first terminal device is determined according to first information by receiving the first information related to the synchronous reference source, wherein the target synchronous reference source is used for positioning a sidelink, so that each terminal device participating in the sidelink positioning can carry out clock synchronization based on the same synchronous reference source, clock source deviation among each positioning auxiliary terminal device is eliminated as much as possible, the accuracy and precision of a sidelink positioning result can be effectively improved, and the positioning efficiency is improved.

Description

Method and device for determining synchronous reference source

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for determining a synchronization reference source.

Background

Positioning based on a sidelink (sidelink) between a terminal device and a terminal device includes absolute positioning, relative positioning, and ranging. Absolute positioning is the determination of the absolute coordinates of the terminal device, relative positioning is the determination of the coordinates of the terminal device relative to a reference point, and ranging is the determination of the distance and/or angle of the terminal device relative to a reference point.

In general, absolute positioning and relative positioning may involve a plurality of auxiliary terminal devices to participate in the positioning.

Disclosure of Invention

An embodiment of a first aspect of the present application provides a method for determining a synchronization reference source, where the method is performed by a first terminal device, and the method includes:

receiving first information related to a synchronization reference source;

determining a target synchronization reference source of the first terminal equipment according to the first information;

wherein the target synchronization reference source is used for positioning sidelink.

An embodiment of a second aspect of the present application provides a method for determining a synchronization reference source, where the method is performed by a second terminal device, and the method includes:

sending first information related to a synchronous reference source to first terminal equipment;

the first information is used for determining a target synchronization reference source of the first terminal equipment;

An embodiment of the third aspect of the present application provides a method for determining a synchronization reference source, where the method is performed by an access network device, and the method includes:

sending first information related to a synchronous reference source to a first terminal device;

An embodiment of a fourth aspect of the present application provides a method for determining a synchronization reference source, where the method is performed by a core network device, and the method includes:

wherein the target synchronization reference source is used for positioning of a sidelink.

An embodiment of a fifth aspect of the present application provides an apparatus for determining a synchronization reference source, where the apparatus is applied to a first terminal device, and the apparatus includes:

a transceiving unit for first information related to a synchronization reference source;

the processing unit is used for determining a target synchronization reference source of the first terminal equipment according to the first information;

An embodiment of a sixth aspect of the present application provides an apparatus for determining a synchronization reference source, where the apparatus is applied to a second terminal device, and the apparatus includes:

a transceiving unit, configured to send first information related to a synchronization reference source to a first terminal device;

An embodiment of a seventh aspect of the present application provides an apparatus for determining a synchronization reference source, where the apparatus is applied to an access network device, and the apparatus includes:

An embodiment of an eighth aspect of the present application provides an apparatus for determining a synchronization reference source, where the apparatus is applied to a core network device, and the apparatus includes:

An embodiment of a ninth aspect of the present application provides a communication apparatus, which includes a processor and a memory, where the memory stores a computer program, and the processor executes the computer program stored in the memory, so as to enable the apparatus to perform the method for determining a synchronization reference source according to the embodiment of the first aspect or perform the method for determining a synchronization reference source according to the embodiment of the second aspect.

A tenth aspect of the present application provides a communication apparatus, where the apparatus includes a processor and a memory, where the memory stores a computer program, and the processor executes the computer program stored in the memory, so as to cause the apparatus to perform the method for determining a synchronization reference source according to the third aspect of the present invention or perform the method for determining a synchronization reference source according to the fourth aspect of the present invention.

An eleventh aspect of the present application provides a communication apparatus, which includes a processor and an interface circuit, where the interface circuit is configured to receive code instructions and transmit the code instructions to the processor, and the processor is configured to execute the code instructions to enable the apparatus to perform the method for determining a synchronization reference source according to the first aspect of the present application, or to perform the method for determining a synchronization reference source according to the second aspect of the present application.

An embodiment of a twelfth aspect of the present application provides a communication apparatus, which includes a processor and an interface circuit, the interface circuit is configured to receive code instructions and transmit the code instructions to the processor, and the processor is configured to execute the code instructions to enable the apparatus to perform the method for determining a synchronization reference source according to the embodiment of the third aspect or perform the method for determining a synchronization reference source according to the embodiment of the fourth aspect.

An embodiment of a thirteenth aspect of the present application proposes a computer-readable storage medium, storing instructions that, when executed, cause the method for determining a synchronization reference source according to the embodiment of the first aspect to be implemented, or cause the method for determining a synchronization reference source according to the embodiment of the second aspect to be implemented.

An embodiment of a fourteenth aspect of the present application proposes a computer-readable storage medium, which stores instructions that, when executed, enable the method for determining a synchronization reference source described in the foregoing embodiment of the third aspect to be implemented, or enable the method for determining a synchronization reference source described in the foregoing embodiment of the fourth aspect to be implemented.

An embodiment of the fifteenth aspect of the present application provides a computer program, which when run on a computer, causes the computer to execute the method for determining a synchronization reference source according to the embodiment of the first aspect, or execute the method for determining a synchronization reference source according to the embodiment of the second aspect.

An embodiment of a sixteenth aspect of the present application provides a computer program, which when run on a computer, causes the computer to execute the method for determining a synchronization reference source according to the third aspect of the present application or the method for determining a synchronization reference source according to the fourth aspect of the present application.

According to the method and the device for determining the synchronous reference source, the first information related to the synchronous reference source is received, and the target synchronous reference source of the first terminal device is determined according to the first information, wherein the target synchronous reference source is used for positioning the sideline link sidelink, so that each terminal device participating in positioning of the sideline link can perform clock synchronization based on the same synchronous reference source, clock source deviation among each positioning auxiliary terminal device is eliminated as much as possible, accuracy and precision of a positioning result of the sideline link can be effectively improved, and positioning efficiency is improved.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present application, the drawings required to be used in the embodiments or the background art of the present application will be described below.

Fig. 1 is a schematic architecture diagram of a communication system according to an embodiment of the present application;

fig. 2 is a schematic flowchart of a method for determining a synchronization reference source according to an embodiment of the present application;

fig. 3 is a schematic flowchart of a method for determining a synchronization reference source according to an embodiment of the present application;

fig. 4 is a schematic flowchart of a method for determining a synchronization reference source according to an embodiment of the present application;

fig. 5 is a schematic flowchart of a method for determining a synchronization reference source according to an embodiment of the present application;

fig. 6 is a schematic flowchart of a method for determining a synchronization reference source according to an embodiment of the present application;

fig. 7 is a flowchart illustrating a method for determining a synchronization reference source according to an embodiment of the present application;

fig. 8 is a flowchart illustrating a method for determining a synchronization reference source according to an embodiment of the present application;

fig. 9 is a schematic flowchart of a method for determining a synchronization reference source according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of an apparatus for determining a synchronous reference source according to an embodiment of the present application;

fig. 11 is a schematic structural diagram of an apparatus for determining a synchronization reference source according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of an apparatus for determining a synchronization reference source according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of an apparatus for determining a synchronous reference source according to an embodiment of the present application;

fig. 14 is a schematic structural diagram of another apparatus for determining a synchronization reference source according to an embodiment of the present application;

fig. 15 is a schematic structural diagram of a chip according to an embodiment of the present application.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the examples of this application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the embodiments of the application, as detailed in the appended claims.

The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the present application. As used in the examples of this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, the information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of embodiments of the present application. The words "if" and "if" as used herein may be interpreted as "at \8230; \8230whenor" when 8230; \8230, when or "in response to a determination", depending on the context.

Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the like or similar elements throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.

In order to better understand a method for determining a synchronization reference source disclosed in the embodiments of the present application, a communication system to which the embodiments of the present application are applicable is first described below.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a communication system according to an embodiment of the present disclosure. The communication system may include, but is not limited to, a core network device, an access network device and a terminal device, the number and the form of the devices shown in fig. 1 are merely examples and do not constitute a limitation to the embodiments of the present application, and in practical applications, two or more network devices and two or more terminal devices may be included. The communication system shown in fig. 1 is exemplified by a system including a core network device 101, an access network device 102, and four terminal devices 103 to 106.

It should be noted that the technical solutions of the embodiments of the present application may be applied to various communication systems. For example: a Long Term Evolution (LTE) system, a fifth generation mobile communication system, a 5G new air interface system, or other future new mobile communication systems.

The access network device 102 in the embodiment of the present application is an entity for transmitting or receiving signals on the network side. For example, the access network device 102 may be an Evolved NodeB (eNB), a Transmission Point (TRP), a Next Generation base station (gNB) in an NR system, a base station in other future mobile communication systems, or an access node in a Wireless Fidelity (WiFi) system. The embodiment of the present application does not limit the specific technology and the specific device form adopted by the access network device. The access network device provided in the embodiment of the present application may be composed of a Central Unit (CU) and a Distributed Unit (DU), where the CU may also be referred to as a Control Unit (Control Unit), and a protocol layer of an access network device, such as a base station, may be split by using a structure of CU-DU, functions of a part of the protocol layer are centrally controlled by the CU, and functions of the remaining part or all of the protocol layer are Distributed in the DU, and the DU is centrally controlled by the CU.

The terminal devices 103-106 in the embodiments of the present application are entities, such as mobile phones, on the user side for receiving or transmitting signals. The Terminal equipment may also be referred to as Terminal equipment (Terminal), user Equipment (UE), mobile Station (MS), mobile Terminal equipment (MT), and so on. The terminal device may be an automobile with a communication function, a Smart automobile, a Mobile Phone (Mobile Phone), a wearable device, a tablet computer (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal device in Industrial Control (Industrial Control), a wireless terminal device in unmanned Driving (Self-Driving), a wireless terminal device in Remote Surgery (Remote Medical Surgery), a wireless terminal device in Smart Grid (Smart Grid), a wireless terminal device in Transportation Safety (Transportation Safety), a wireless terminal device in Smart City (Smart City), a wireless terminal device in Smart Home (Smart Home), and the like. The embodiment of the present application does not limit the specific technology and the specific device form adopted by the terminal device.

Common positioning methods are Downlink Time Difference of Arrival (DL-TDOA), uplink Time Difference of Arrival (UL-TDOA), multiple cell-Round Trip Time (multiple RTT), arrival Angle/Departure Angle (Angle of Arrival/Angle of Departure, AOA/AOD), carrier phase positioning, etc.

Taking the DL-TDOA Positioning method as an example in fig. 1, terminal device 103 can receive Positioning Reference Signals (PRS) sent by multiple terminal devices (terminal devices 104 to 106 in the figure) through Sidelink (SL), and terminal device 103 can determine its specific location relative to the terminal devices 104 to 106 by measuring the multiple SL PRS. If the positioning result is not converted into absolute position coordinates based on absolute position information such as a GPS of the positioning assistance terminal device, the positioning result is a relative positioning result. Otherwise, it is absolute positioning. The terminal devices participating in the relative/absolute positioning are positioning assistance terminal devices.

Positioning assistance terminal devices, which are of different types, such as Road Side Unit (RSU) type, belong to an infrastructure and can provide positioning services by cooperating with other RSUs; for example, a common terminal device can also be used as a positioning auxiliary terminal device, but it is difficult to assist in providing positioning service together with other terminal devices; in addition, some positioning auxiliary terminal devices have position information such as GPS, which can assist other terminal devices in absolute positioning; other positioning auxiliary terminal devices may not have position information such as GPS, and cannot assist the positioned terminal device to perform absolute positioning.

In the related art, when a positioning method requiring assistance from a plurality of positioning assistance terminal apparatuses, such as positioning methods of TDOA, AOA/AOD, etc., is adopted, PRS is transmitted from the plurality of positioning assistance terminal apparatuses to the terminal apparatus to be positioned. However, the synchronization source of the clocks of the plurality of positioning assistance terminal devices may be different. This makes it difficult to determine the clock source offset between the individual positioning assistance terminal devices.

It is to be understood that the communication system described in the embodiment of the present application is for more clearly illustrating the technical solution of the embodiment of the present application, and does not constitute a limitation to the technical solution provided in the embodiment of the present application, and as a person having ordinary skill in the art knows that along with the evolution of the system architecture and the appearance of a new service scenario, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems.

The method for determining a synchronization reference source and the apparatus thereof provided by the present application are described in detail below with reference to the accompanying drawings.

Referring to fig. 2, fig. 2 is a schematic flowchart illustrating a method for determining a synchronization reference source according to an embodiment of the present disclosure. It should be noted that the method for determining the synchronization reference source according to the embodiment of the present application is executed by the first terminal device. The method may be performed independently or in conjunction with any of the other embodiments of the present application. As shown in fig. 2, the method may include the steps of:

in step 201, first information related to a synchronization reference source is received.

In this embodiment of the application, the first terminal device may be capable of receiving first information sent by at least one of the second terminal device, the access network device, and the core network device, and determining a target synchronization reference source for sidelink positioning according to the first information.

In embodiments of the present application, the first terminal device and the second terminal device are both sidelink terminal devices, where the SL terminal device includes at least one of: a primary positioning auxiliary terminal device; positioning an auxiliary terminal device; the terminal device being located. That is, in the embodiments of the present application, the first terminal device may be any one of a primary positioning assistance terminal device, a positioning assistance terminal device, and a terminal device to be positioned, and the second terminal device may also be any one of a primary positioning assistance terminal device, a positioning assistance terminal device, and a terminal device to be positioned.

It should be noted that, in the embodiments of the present application, the positioning auxiliary terminal device refers to an auxiliary terminal device that participates in SL positioning of a terminal device to be positioned. The main positioning auxiliary terminal device is a positioning auxiliary terminal device which is determined among a plurality of positioning auxiliary terminal devices and communicates with a positioned terminal device, a network device (including an access network device and a core network device) and other positioning auxiliary terminal devices when the plurality of positioning auxiliary terminal devices assist in positioning. That is, if there is one main positioning assistance terminal device in the plurality of positioning assistance terminal devices, the main positioning assistance terminal device interacts with the positioned terminal device, and the main positioning assistance terminal device interacts with the network device (including the access network device and the core network device). The main positioning auxiliary terminal equipment can also interact with other positioning auxiliary terminal equipment.

In embodiments of the present application, the core network device may be a Location Management Function LMF (Location Management Function).

It can be understood that, in the embodiments of the present application, information interaction between the first terminal device and the core network device is completed through transparent transmission in the access network. That is, the first terminal device receives information sent by the core network device through the access network device, and the first terminal device sends information to the core network device through the access network device.

In this embodiment, the first information may be sent by at least one of the second terminal device, the access network device, and the core network device.

That is, as one possible implementation, the first terminal device receives the first information transmitted by the second terminal device.

As another possible implementation, the first terminal device receives the first information sent by the access network device.

As another possible implementation, the first terminal device receives the first information sent by the core network device.

As another possible implementation, the first terminal device receives the first information sent by the second terminal device and the access network device.

As another possible implementation, the first terminal device receives the first information sent by the second terminal device and the core network device.

As another possible implementation, the first terminal device receives the first information sent by the access network device and the core network device.

As another possible implementation, the first terminal device receives the first information sent by the second terminal device, the access network device, and the core network device.

In some embodiments, the first information is used to determine a priority of the at least one synchronization reference source type.

Optionally, the first information may be at least one of: global Navigation Satellite System (GNSS) priority; the access network equipment takes precedence; sidelink terminal equipment takes precedence.

In some embodiments, the first information is used to indicate at least one candidate synchronization reference source.

Optionally, the first information is used to indicate at least one of the following information:

sidelink synchronization Sequence Identity (SL SSID) of the terminal device as the candidate synchronization reference source;

an in coverage indication of the terminal device as a candidate synchronization reference source;

sidelink Synchronization Signal Block (SL SSB) time domain allocation information of a terminal device as a candidate Synchronization reference source;

side link layer 2 identification of the terminal equipment as a candidate synchronous reference source;

a sidelink positioning reference signal SL PRS mark of the terminal equipment as a candidate synchronous reference source;

the type of the candidate synchronous reference source is GNSS;

the type of the candidate synchronous reference source is access network equipment;

and the access network equipment identification is taken as a candidate synchronous reference source.

The coverage indication of the terminal device is used to indicate whether the terminal device is accessed to the serving cell or not and is in coverage (in coverage).

Optionally, the SL SSB time domain allocation information may include at least one of: the transmission period of the SL SSB, the transmission time offset of the SL SSB, the number of SSBs transmitted in one period, and the like.

Alternatively, the SL SSB time domain allocation information may be indicated using a parameter SL-SSB-time allocation. The parameter definition may refer to 3GPP technical specification TS38.331.

Optionally, the access network device Identifier may include at least one of a Physical Cell Identifier (PCI) and a Global Cell Identifier (GCI) of a Cell in which the access network device is located.

Optionally, the first information may indicate one or more candidate synchronization reference sources, and if the first information indicates a plurality of candidate synchronization reference sources, the first information further includes priorities of the plurality of candidate synchronization reference sources.

In some embodiments, the first information includes priority information for determining a priority of the at least one synchronization reference source type and first indication information for indicating at least one candidate synchronization reference source.

Optionally, the priority information may be at least one of the following: GNSS priority; the access network equipment takes precedence; SL terminal equipment takes precedence. The first indication information may be used to indicate at least one of the following information:

SL SSID of the terminal equipment as a candidate synchronous reference source;

SL SSB time domain distribution information of terminal equipment serving as a candidate synchronous reference source;

the type of the candidate synchronous reference source is GNSS;

In some embodiments, the first information further comprises second indication information, wherein the second indication information is used for indicating the effective time of the first information.

Optionally, the second indication information may be used to indicate the effective time length of the first information, may also be used to indicate the time when the first information is effective and the time when the first information is effective, and the like.

Optionally, if the second indication information does not indicate the validation start time of the first information, the validation start time of the first information may be a time when the first information is received, a preset time before or after the time when the first information is received, or the like, where the preset time may be specified by a protocol or indicated by other information.

In some embodiments, the first information further comprises at least one of: a Reference Signal Receiving Power (RSRP) absolute threshold of the target synchronous Reference source; the Reference Signal Received Power (RSRP) of a target synchronous reference source is relative to a threshold value; the layer 3 filter coefficients of the target synchronous reference source.

And the RSRP absolute threshold value or the RSRP relative threshold value is used for determining candidate synchronous reference sources meeting the RSRP absolute threshold value or the RSRP relative threshold value requirement as target synchronous reference sources.

It is understood that the target synchronization reference source is a sidelink terminal device.

It should be noted that, satisfying the RSRP absolute threshold requirement means that the RSRP of the candidate synchronization reference source exceeds the RSRP absolute threshold. The RSRP relative threshold requirement is satisfied, that is, the RSRP of the candidate synchronization reference source exceeds the RSRP relative threshold compared with the RSRP of the current synchronization reference source of the first terminal device.

Optionally, the RSRP may be a Physical Sidelink Broadcast Channel (PSBCH) RSRP, a SL PRS RSRP, or the like.

In some embodiments, the first information transmitted by the second terminal device may be included in at least one of the following messages: a sidelink location protocol message; bottom layer direct connection cellular communication protocol PC5 message; a Radio Resource Control (RRC) message.

Optionally, the Sidelink Positioning Protocol message may be a Sidelink LPP (LTE Positioning Protocol) message, such as a request for assistance information and provision assistance information of the Sidelink LPP, or other Sidelink Positioning Protocol messages.

Alternatively, the SL RRC message may be a SL broadcast message or a SL dedicated RRC message, such as a SL RRC reconfiguration message, a SL UE assistance message, and the like.

In some embodiments, the first information sent by the access network device may be included in at least one of the following messages: a system broadcasts a message; a radio resource control, RRC, reconfiguration message; radio resource control RRC connection release (release) message.

In some embodiments, the first information sent by the core network device through the access network device may be included in an LTE positioning protocol, LPP, message.

Alternatively, the LPP message may be a request for assistance information and/or provide assistance information for LPP.

Step 202, according to the first information, determining a target synchronization reference source of the first terminal device.

In this embodiment of the present application, the first terminal device is capable of determining a target synchronization reference source used for SL positioning by itself based on the received first information.

In the embodiment of the present application, the target synchronization reference source is used for SL positioning, which means that the target synchronization reference source may be used in at least one of the following cases:

sending the SL PRS; receiving by using a SL PRS; transmission and/or reception of SL positioning related control signaling (such as SL positioning protocol messages, SL RRC positioning related system messages or dedicated RRC messages, etc.).

In the embodiments of the present application, the target synchronization reference source may be a synchronization reference source dedicated for SL positioning, or alternatively, the target synchronization reference source may also be a synchronization reference source shared by SL positioning and SL communication.

It can be understood that if the target synchronization reference source is a synchronization reference source dedicated to SL positioning, the first terminal device determines the target synchronization reference source for positioning according to the first information, and the synchronization reference source for SL communication is still determined according to the related information of the synchronization reference source for SL communication. If the target synchronization reference source is common to both SL positioning and SL communication, the determined target synchronization reference source may be used for both SL positioning and SL communication.

In some embodiments, the first information is a GNSS priority, and the GNSS is determined to be a target synchronization reference source for the first terminal device.

Optionally, if the first terminal device cannot acquire the GNSS as the target synchronization reference source, it is determined that the sidelink terminal device is used as the target synchronization reference source of the first terminal device.

For example, when the GNSS is prioritized, the priority of each synchronization reference source type from high to low may be as follows:

GNSS, sidelink terminal equipment, terminal equipment directly synchronized to GNSS, terminal equipment indirectly synchronized to GNSS, access network equipment (gNB/eNB), terminal equipment directly synchronized to gNB/eNB, terminal equipment indirectly synchronized to gNB/eNB, the remaining terminal equipment with the lowest priority, etc.

The first terminal device may determine the target synchronization reference source in the order of the synchronization reference source type priorities as shown above.

It is to be understood that the above-mentioned order of synchronization reference source type priority is only an example, and other priority orders may be defined, which is not limited in the present application. When the first terminal device determines the target synchronization reference source according to the sequence, only a partial sequence may be taken, or the partial sequence may be skipped, which is not limited in this application.

In some embodiments, the first information is a priority of the sidelink terminal device, and the sidelink terminal device is determined as a target synchronization reference source of the first terminal device.

The SL terminal equipment comprises: one or more of a primary positioning assistance terminal device, a positioning assistance terminal device and a terminal device to be positioned.

For example, when the SL terminal device gives priority, the synchronization reference source type priority may be as follows:

a sidelink terminal device, a GNSS, a terminal device directly synchronized to a GNSS, a terminal device indirectly synchronized to a GNSS, an access network device (gNB/eNB), a terminal device directly synchronized to a gNB/eNB, a terminal device indirectly synchronized to a gNB/eNB, the remaining terminal devices with the lowest priority, etc.

It should also be understood that the order of priority of the synchronization reference source types is only an example, and other priority orders may be defined, which is not limited in the present application. When the first terminal device determines the target synchronization reference source according to the sequence, only a partial sequence may be taken, or the partial sequence may be skipped, which is not limited in this application.

In some embodiments, the first information is a priority of the access network device, and the access network device is determined to be a target synchronization reference source of the first terminal device.

Illustratively, when the access network device gives priority, the priority of each synchronization reference source type from high to low may be as follows:

access network equipment (gNB/eNB), sidelink terminal equipment, terminal equipment directly synchronized to gNB/eNB, terminal equipment indirectly synchronized to gNB/eNB, GNSS, terminal equipment directly synchronized to GNSS, terminal equipment indirectly synchronized to GNSS, the rest of terminal equipment with lowest priority, etc.

In some embodiments, the first information is used to indicate at least one candidate synchronization reference source from which the first terminal device can determine the target synchronization reference source.

Optionally, the first information is used to indicate a plurality of candidate synchronization reference sources, the first information further includes priorities of the candidate synchronization reference sources, and the first terminal device may determine the target synchronization reference source based on the priorities of the candidate synchronization reference sources.

In some embodiments, the first information includes priority information and first indication information, wherein the priority information is used for determining the priority of the at least one synchronization reference source type, the first indication information is used for indicating at least one candidate synchronization reference source, and the first terminal device can determine the target synchronization reference source from the at least one candidate synchronization reference source indicated by the first indication information.

Optionally, if the first terminal device cannot acquire the at least one candidate synchronization reference source indicated by the first indication information, the first terminal device determines a target synchronization reference source of the first terminal device according to the priority information.

Optionally, if the first terminal device cannot acquire the at least one candidate synchronization reference source indicated by the first indication information, the first terminal device may further send feedback information to at least one of the second terminal device, the access network device, and the core network device, where the feedback information is used to indicate that the first terminal device cannot synchronize with the indicated target synchronization reference source.

It is to be understood that the at least one candidate synchronization reference source indicated by the first indication information cannot be acquired by the first terminal device.

In some embodiments, if the first terminal device receives the broadcast message and the first terminal device-specific message, and both the broadcast message and the first terminal device-specific message include the first information, the first terminal device may preferentially determine the target synchronization reference source of the first terminal device according to the first information in the first terminal device-specific message.

Optionally, the broadcast message includes a broadcast message sent by the access network device, and a SL broadcast message sent by the second terminal device. The first terminal device specific message comprises a specific message sent by the access network device and a SL first terminal device specific message sent by the second terminal device.

In some embodiments, if the first terminal device receives the first information sent by the second terminal device and the access network device, the first terminal device may preferentially determine the target synchronization reference source of the first terminal device according to the first information sent by the second terminal device.

In some embodiments, if the first terminal device receives the first information sent by the second terminal device and the access network device, the first terminal device may preferentially determine the target synchronization reference source of the first terminal device according to the first information sent by the access network device.

In some embodiments, if the first terminal device receives first information sent by multiple of the second terminal device, the access network device, and the core network device, the first terminal device may preferentially select, according to a specification of a protocol or an indication of other information, to determine the target synchronization reference source of the first terminal device based on the first information sent by the second terminal device or the access network device, or the core network device.

In summary, by receiving first information related to a synchronization reference source, and determining a target synchronization reference source of the first terminal device according to the first information, where the target synchronization reference source is used for positioning a sidelink, each terminal device participating in sidelink positioning can perform clock synchronization based on the same synchronization reference source, thereby eliminating clock source offset between each positioning auxiliary terminal device as much as possible, and effectively improving accuracy and precision of a sidelink positioning result, and improving positioning efficiency.

Referring to fig. 3, fig. 3 is a flowchart illustrating a method for determining a synchronization reference source according to an embodiment of the present disclosure. It should be noted that the method for determining the synchronization reference source in the embodiment of the present application is executed by the first terminal device. The method may be performed independently or in conjunction with any of the other embodiments of the present application. As shown in fig. 3, the method may include the steps of:

step 301, receiving first information sent by at least one of the second terminal device, the access network device, and the core network device, where the first information is used to determine a priority of at least one synchronization reference source type.

Optionally, the first information may be at least one of the following: GNSS priority; the access network equipment takes precedence; SL terminal equipment takes precedence.

In embodiments of the present application, both the first terminal device and the second terminal device are SL terminal devices, where the SL terminal devices include at least one of: a primary positioning auxiliary terminal device; positioning an auxiliary terminal device; the terminal device being located.

In the embodiments of the present application, the core network device may be a location management function LMF.

It can be understood that, in the embodiments of the present application, information interaction between the first terminal device and the core network device is completed through transparent transmission of the access network. That is, the first terminal device receives information sent by the core network device through the access network device, and the first terminal device sends information to the core network device through the access network device.

In this embodiment, the first information may be sent by at least one of the second terminal device, the access network device and the core network device.

Optionally, the second indication information may be used to indicate the effective time length of the first information, may also be used to indicate the time when the first information is effective, may also be used to indicate the time when the first information starts to be effective and the time when the first information ends to be effective, may also be used to indicate the time when the first information starts to be effective and the time when the first information starts to be effective, and the like.

In some embodiments, the first information further comprises at least one of: the RSRP absolute threshold value of the target synchronous reference source; the RSRP relative threshold value of the target synchronous reference source; the layer 3 filter coefficients of the target synchronous reference source.

The RSRP absolute threshold or RSRP relative threshold is used to determine a candidate synchronization reference source that meets the RSRP absolute threshold or RSRP relative threshold requirement as a target synchronization reference source.

It should be noted that, meeting the RSRP absolute threshold requirement means that the RSRP of the candidate synchronization reference source exceeds the RSRP absolute threshold. Satisfying the RSRP relative threshold requirement means that the RSRP of the candidate synchronization reference source exceeds the RSRP relative threshold compared to the RSRP of the current synchronization reference source of the first terminal device.

Optionally, the RSRP may be PSBCH RSRP, SL PRS RSRP, or the like.

In some embodiments, the first information transmitted by the second terminal device may be included in at least one of the following messages: a sidelink location protocol message; bottom layer direct connection cellular communication protocol PC5 message; SL RRC message.

Optionally, the Sidelink positioning protocol message may be a Sidelink LPP message, such as a request for assistance information, a provision of assistance information of the Sidelink LPP, or other Sidelink positioning protocol messages.

In some embodiments, the first information sent by the access network device may be included in at least one of the following messages: a system broadcasts a message; a radio resource control, RRC, reconfiguration message; radio resource control, RRC, connection release message.

In some embodiments, the first information transmitted by the core network device may be included in an LTE positioning protocol, LPP, message.

Step 302, according to the first information, determining a target synchronization reference source of the first terminal device.

Wherein the target synchronization reference source is used for positioning the sidelink.

Optionally, if the first terminal device cannot acquire the GNSS as the target synchronization reference source, determining the sidelink terminal device as the target synchronization reference source of the first terminal device.

For example, when GNSS is prioritized, the priority of each synchronization reference source type from high to low can be as follows:

In some embodiments, the first information is a sidelink terminal device priority, and the sidelink terminal device is determined as a target synchronization reference source of the first terminal device.

It should also be understood that the order of the synchronization reference source type priorities is only an example, and other priority orders may be defined, which is not limited in the present application. When the first terminal device determines the target synchronization reference source according to the sequence, only a partial sequence may be taken, or the partial sequence may be skipped, which is not limited in this application.

Optionally, the broadcast message includes a broadcast message sent by the access network device and a SL broadcast message sent by the second terminal device. The first terminal device specific message comprises a specific message sent by the access network device and a SL first terminal device specific message sent by the second terminal device.

In some embodiments, if the first terminal device receives first information sent by multiple ones of the second terminal device, the access network device, and the core network device, the first terminal device may preferentially select, according to a specification of a protocol or an indication of other information, a target synchronization reference source of the first terminal device to be determined based on the first information sent by the second terminal device, the access network device, or the core network device.

In summary, by receiving first information sent by at least one of the second terminal device, the access network device, and the core network device, where the first information is used to determine a priority of at least one synchronous reference source type, and determining a target synchronous reference source of the first terminal device according to the first information, each terminal device participating in the sidelink positioning can perform clock synchronization based on the same synchronous reference source, thereby eliminating clock source offset between each positioning auxiliary terminal device as much as possible, and effectively improving accuracy and precision of the sidelink positioning result and positioning efficiency.

Referring to fig. 4, fig. 4 is a flowchart illustrating a method for determining a synchronization reference source according to an embodiment of the present disclosure. It should be noted that the method for determining the synchronization reference source according to the embodiment of the present application is executed by the terminal device. The method may be performed independently or in conjunction with any of the other embodiments of the present application. As shown in fig. 4, the method may include the steps of:

step 401, receiving first information sent by at least one of a second terminal device, an access network device, and a core network device, where the first information is a global navigation satellite system GNSS priority.

In the embodiment of the present application, when the first information is GNSS priority, the priority of each synchronization reference source type used for determining from high to low may be as follows:

GNSS, sidelink terminal equipment, terminal equipment directly synchronized to GNSS, terminal equipment indirectly synchronized to GNSS, access network equipment (gNB/eNB), terminal equipment directly synchronized to gNB/eNB, terminal equipment indirectly synchronized to gNB/eNB, the rest of the terminal equipment with the lowest priority, etc.

In some embodiments, the first information further comprises at least one of: RSRP absolute threshold value of target synchronous reference source; the RSRP relative threshold value of the target synchronous reference source; layer 3 filter coefficients of the target synchronous reference source.

Optionally, the RSRP may be PSBCH RSRP, SL PRS RSRP, or the like.

Step 402, determining a GNSS as a target synchronization reference source for the first terminal device.

In step 403, in response to failing to acquire GNSS as the target synchronization reference source, determining the sidelink terminal device as the target synchronization reference source of the first terminal device.

In this embodiment of the present application, if the first terminal device cannot acquire a GNSS as the target synchronization reference source, the SL terminal device may be determined to be the target synchronization reference source of the first terminal device.

Optionally, further, if the first terminal device cannot acquire the SL terminal device as the target synchronization reference source, the target synchronization reference source may be determined according to the sequence exemplarily shown in step 401.

In summary, by receiving first information sent by at least one of the second terminal device, the access network device, and the core network device, where the first information is a global navigation satellite system GNSS priority, determining that the GNSS is used as a target synchronization reference source of the first terminal device, and in response to that the GNSS cannot be acquired as the target synchronization reference source, determining that the sidelink terminal device is used as the target synchronization reference source of the first terminal device, each terminal device participating in sidelink positioning can perform clock synchronization based on the same synchronization reference source, thereby eliminating clock source offset between each positioning auxiliary terminal device as much as possible, and effectively improving accuracy and precision of a sidelink positioning result and positioning efficiency.

Referring to fig. 5, fig. 5 is a schematic flowchart illustrating a method for determining a synchronization reference source according to an embodiment of the present disclosure. It should be noted that the method for determining the synchronization reference source in the embodiment of the present application is executed by the terminal device. The method may be performed independently or in conjunction with any of the other embodiments of the present application. As shown in fig. 5, the method may include the steps of:

step 501, receiving first information sent by at least one of a second terminal device, an access network device, and a core network device, where the first information is used to indicate at least one candidate synchronization reference source.

SL SSID of the terminal equipment as a candidate synchronous reference source;

a sidelink layer 2 identifier of the terminal equipment as a candidate synchronous reference source;

the type of the candidate synchronous reference source is GNSS;

In various embodiments of the present application, the core network device may be a location management function LMF.

In some embodiments, the first information further comprises at least one of: the RSRP absolute threshold value of the target synchronous reference source; the RSRP relative threshold value of the target synchronous reference source; layer 3 filter coefficients of the target synchronous reference source.

Optionally, the RSRP may be PSBCH RSRP, SL PRS RSRP, or the like.

Step 502, determining a target synchronization reference source of the first terminal device from the at least one candidate synchronization reference source.

In this embodiment, the first terminal device is capable of determining, based on the received first information, a target synchronization reference source for the SL positioning itself from at least one candidate synchronization reference source indicated by the first information.

sending the SL PRS; SL PRS receiving; transmission and/or reception of SL positioning related control signaling (such as SL positioning protocol messages, SL RRC positioning related system messages or dedicated RRC messages, etc.).

In the embodiments of the present application, optionally, the target synchronization reference source may be a synchronization reference source dedicated for SL positioning, or the target synchronization reference source may also be a synchronization reference source shared by SL positioning and SL communication.

In some embodiments, if the first terminal device receives first information sent by multiple ones of the second terminal device, the access network device, and the core network device, the first terminal device may preferentially select, according to a specification of a protocol or an indication of other information, a target synchronization reference source of the first terminal device to be determined according to the first information sent by the second terminal device, or the access network device, or the core network device.

In summary, by receiving first information sent by at least one of the second terminal device, the access network device, and the core network device, where the first information is used to indicate at least one candidate synchronization reference source, and determining a target synchronization reference source of the first terminal device from the at least one candidate synchronization reference source, each terminal device participating in the sidelink positioning can perform clock synchronization based on the same synchronization reference source, thereby eliminating clock source offset between each positioning auxiliary terminal device as much as possible, and effectively improving accuracy and precision of the sidelink positioning result and positioning efficiency.

Referring to fig. 6, fig. 6 is a flowchart illustrating a method for determining a synchronization reference source according to an embodiment of the present disclosure. It should be noted that the method for determining the synchronization reference source according to the embodiment of the present application is executed by the terminal device. The method may be performed independently or in conjunction with any of the other embodiments of the present application. As shown in fig. 6, the method may include the steps of:

step 601, receiving first information sent by at least one of the second terminal device, the access network device and the core network device, where the first information includes priority information and first indication information.

The priority information is used for determining the priority of at least one synchronization reference source type, and the first indication information is used for indicating at least one candidate synchronization reference source.

Wherein, optionally, the priority information may be at least one of the following: GNSS priority; the access network equipment takes precedence; SL terminal equipment takes precedence. The first indication information may be used to indicate at least one of the following information:

SL SSID of the terminal equipment as a candidate synchronous reference source;

the side-link synchronization signal block SL SSB time domain distribution information of the terminal equipment as a candidate synchronization reference source;

the type of the candidate synchronous reference source is GNSS;

Optionally, the first indication information may indicate one or more candidate synchronization reference sources, and if the first indication information indicates multiple candidate synchronization reference sources, the first indication information further includes priorities of the multiple candidate synchronization reference sources.

Optionally, the RSRP may be PSBCH RSRP, SL PRS RSRP, or the like.

Step 602, determining a target synchronization reference source of the first terminal device from at least one candidate synchronization reference source indicated by the first indication information.

In this embodiment of the application, when the received first information includes priority information and first indication information, the first terminal device preferentially determines a target synchronization reference source of the first terminal device from at least one candidate synchronization reference source indicated by the first indication information.

Optionally, the first indication information is used to indicate a plurality of candidate synchronization reference sources, the first indication information further includes priorities of the candidate synchronization reference sources, and the first terminal device may determine the target synchronization reference source based on the priorities of the candidate synchronization reference sources.

Step 603, in response to failing to obtain at least one candidate synchronization reference source indicated by the first indication information, determining a target synchronization reference source of the first terminal device according to the priority information.

In this embodiment of the present application, if the first terminal device cannot acquire any one of the at least one candidate synchronization reference source indicated by the first indication information, the target synchronization reference source of the first terminal device is determined according to the priority information in the first information.

Optionally, the first terminal device may determine the target synchronization reference source of the first terminal device according to the priority of each synchronization reference source type determined by the priority information.

It can be understood that the process of determining the target synchronization reference source according to the priority information may be as described in various embodiments of the present application, and is not described herein again.

In some embodiments, if the first terminal device cannot acquire the at least one candidate synchronization reference source indicated by the first indication information, the first terminal device may further send feedback information to at least one of the second terminal device, the access network device, and the core network device, where the feedback information is used to indicate that the first terminal device cannot synchronize with the indicated target synchronization reference source.

In summary, by receiving first information sent by at least one of the second terminal device, the access network device, and the core network device, where the first information includes priority information and first indication information, determining a target synchronization reference source of the first terminal device from at least one candidate synchronization reference source indicated by the first indication information, and in response to failing to obtain the at least one candidate synchronization reference source indicated by the first indication information, determining the target synchronization reference source of the first terminal device according to the priority information, so that each terminal device participating in sidelink link positioning can perform clock synchronization based on the same synchronization reference source, thereby eliminating clock source offset between each positioning auxiliary terminal device as much as possible, and effectively improving accuracy and precision of sidelink link positioning results and positioning efficiency.

Referring to fig. 7, fig. 7 is a schematic flowchart illustrating a method for determining a synchronization reference source according to an embodiment of the present disclosure. It should be noted that the method for determining the synchronization reference source in the embodiment of the present application is executed by the second terminal device. The method may be performed independently or in conjunction with any of the other embodiments of the present application. As shown in fig. 7, the method may include the steps of:

step 701, sending first information to a first terminal device, where the first information is used to determine a target synchronization reference source of the first terminal device.

Optionally, the first information may be at least one of: global navigation satellite system GNSS priority; the access network equipment takes precedence; sidelink terminal equipment takes precedence.

a sidelink synchronization sequence identifier SL SSID of the terminal equipment as a candidate synchronization reference source;

the time domain allocation information of the side-link synchronization signal block SL SSB of the terminal equipment serving as the candidate synchronization reference source;

the type of the candidate synchronous reference source is GNSS;

Wherein, optionally, the priority information may be at least one of the following: GNSS priority; the access network equipment takes precedence; SL terminal equipment takes precedence. The first indication information may be used to indicate at least one of the following:

the type of the candidate synchronous reference source is GNSS;

Optionally, if the second indication information does not indicate the effective starting time of the first information, the effective starting time of the first information may be the time when the first information is received, or a preset time before or after the time when the first information is received, or the like, where the preset time may be protocol-specified or indicated by other information.

In some embodiments, the first information further comprises at least one of: a Reference Signal Received Power (RSRP) absolute threshold value of a target synchronous reference source; the Reference Signal Received Power (RSRP) of a target synchronous reference source is relative to a threshold value; the layer 3 filter coefficients of the target synchronous reference source.

It should be noted that, satisfying the RSRP absolute threshold requirement means that the RSRP of the candidate synchronization reference source exceeds the RSRP absolute threshold. Satisfying the RSRP relative threshold requirement means that the RSRP of the candidate synchronization reference source exceeds the RSRP relative threshold compared to the RSRP of the current synchronization reference source of the first terminal device.

Optionally, the RSRP may be a physical sidelink broadcast channel PSBCH RSRP, a SL PRS RSRP, or the like.

In some embodiments, the first information may be included in at least one of the following messages: a sidelink location protocol message; bottom layer direct connection cellular communication protocol PC5 message; sidelink radio resource control RRC message.

Optionally, the Sidelink positioning protocol message may be a Sidelink LPP message, such as a Sidelink LPP requesting assistance information, providing assistance information, or other Sidelink positioning protocol messages.

It can be understood that if the target synchronization reference source is a synchronization reference source dedicated for SL positioning, the first terminal device determines the target synchronization reference source for positioning according to the first information, and the synchronization reference source for SL communication is still determined according to the related information of the synchronization reference source for SL communication. If the target synchronization reference source is common to both SL positioning and SL communication, the determined target synchronization reference source may be used for both SL positioning and SL communication.

sidelink terminal devices, GNSS, terminal devices directly synchronized to GNSS, terminal devices indirectly synchronized to GNSS, access network device (gNB/eNB), terminal devices directly synchronized to gNB/eNB, terminal devices indirectly synchronized to gNB/eNB, the remaining terminal devices with the lowest priority, etc.

access network equipment (gNB/eNB), sidelink terminal equipment, terminal equipment directly synchronized to gNB/eNB, terminal equipment indirectly synchronized to gNB/eNB, GNSS, terminal equipment directly synchronized to GNSS, terminal equipment indirectly synchronized to GNSS, the remaining terminal equipment with lowest priority, etc.

Optionally, if the first terminal device cannot acquire at least one candidate synchronization reference source indicated by the first indication information, the first terminal device may determine, according to the priority information, a target synchronization reference source of the first terminal device.

Optionally, if the first terminal device cannot acquire at least one candidate synchronization reference source indicated by the first indication information, the second terminal device may further receive feedback information sent by the first terminal device, where the feedback information is used to indicate that the first terminal device cannot synchronize with the indicated target synchronization reference source.

In summary, by sending first information to the first terminal device, the first information is used for determining a target synchronization reference source of the first terminal device, so that each terminal device participating in the sidelink positioning can perform clock synchronization based on the same synchronization reference source, clock source deviations among positioning auxiliary terminal devices are eliminated as much as possible, accuracy and precision of the sidelink positioning result can be effectively improved, and positioning efficiency is improved.

Referring to fig. 8, fig. 8 is a flowchart illustrating a method for determining a synchronization reference source according to an embodiment of the present disclosure. It should be noted that the method for determining the synchronization reference source according to the embodiment of the present application is executed by an access network device. The method may be performed independently or in conjunction with any of the other embodiments of the present application. As shown in fig. 8, the method may include the steps of:

step 801, sending first information to a first terminal device, where the first information is used to determine a target synchronization reference source of the first terminal device.

In embodiments of the present application, the first terminal device is a sidelink terminal device, where the SL terminal device includes at least one of: a primary positioning auxiliary terminal device; positioning an auxiliary terminal device; the terminal device being located. That is, in the embodiments of the present application, the first terminal device may be any one of a primary positioning assistance terminal device, a positioning assistance terminal device, and a terminal device to be positioned.

It should be noted that, in the embodiments of the present application, the positioning auxiliary terminal device refers to an auxiliary terminal device that participates in SL positioning of a terminal device to be positioned. The primary positioning auxiliary terminal device is a positioning auxiliary terminal device which is determined among a plurality of positioning auxiliary terminal devices and communicates with a positioned terminal device, a network device (including an access network device and a core network device) and other positioning auxiliary terminal devices when the plurality of positioning auxiliary terminal devices assist in positioning. That is, if there is one main positioning assistance terminal device in the plurality of positioning assistance terminal devices, the main positioning assistance terminal device interacts with the positioned terminal device, and the main positioning assistance terminal device interacts with the network device (including the access network device and the core network device). The main positioning auxiliary terminal equipment can also interact with other positioning auxiliary terminal equipment.

In some embodiments, the access network device can receive first information sent by the core network device and pass the first information through to the first terminal device.

Optionally, the first information may be included in an LTE positioning protocol LPP message.

Optionally, the LPP message may request assistance information and/or provide assistance information for the LPP.

the type of the candidate synchronous reference source is GNSS;

and the access network equipment identification serving as a candidate synchronization reference source.

the type of the candidate synchronous reference source is GNSS;

In some embodiments, the first information may be included in at least one of the following messages: a system broadcasts a message; a radio resource control, RRC, reconfiguration message; radio resource control RRC connection release (release) message.

For example, when the SL terminal device gives priority, the priority of each synchronization reference source type from high to low may be as follows:

Optionally, if the first terminal device cannot obtain at least one candidate synchronization reference source indicated by the first indication information, the first terminal device may determine a target synchronization reference source of the first terminal device according to the priority information.

It can be understood that the at least one candidate synchronization reference source indicated by the first indication information cannot be acquired, which means that the first terminal device cannot acquire any one of the at least one candidate synchronization reference source indicated by the first indication information.

In summary, by sending the first information to the first terminal device, the first information is used to determine the target synchronization reference source of the first terminal device, so that each terminal device participating in the sidelink positioning can perform clock synchronization based on the same synchronization reference source, thereby eliminating clock source deviation between each positioning auxiliary terminal device as much as possible, and effectively improving accuracy and precision of the sidelink positioning result and positioning efficiency.

Referring to fig. 9, fig. 9 is a flowchart illustrating a method for determining a synchronization reference source according to an embodiment of the present disclosure. It should be noted that the method for determining the synchronization reference source according to the embodiment of the present application is executed by the second terminal device. The method may be performed independently or in conjunction with any of the other embodiments of the present application. As shown in fig. 9, the method may include the steps of:

step 901, sending first information to the first terminal device, where the first information is used to determine a target synchronization reference source of the first terminal device.

the type of the candidate synchronous reference source is GNSS;

In some embodiments, the first information further comprises at least one of: a Reference Signal Received Power (RSRP) absolute threshold value of a target synchronous reference source; the Reference Signal Received Power (RSRP) of a target synchronous reference source is relative to a threshold value; layer 3 filter coefficients of the target synchronous reference source.

In some embodiments, the first information may be included in an LTE positioning protocol, LPP, message.

It is to be understood that the above-mentioned order of synchronization reference source type priority is only an example, and other priority orders may be specified, which is not limited in the present application. When the first terminal device determines the target synchronization reference source according to the sequence, only a partial sequence may be taken, or the partial sequence may be skipped, which is not limited in this application.

The present application also provides a device for determining a synchronization reference source, which corresponds to the methods provided in the foregoing several embodiments, and since the device for determining a synchronization reference source provided in the embodiments of the present application corresponds to the methods provided in the foregoing several embodiments, the embodiments of the method for determining a synchronization reference source are also applicable to the devices for determining a synchronization reference source provided in the following embodiments, and will not be described in detail in the following embodiments.

Referring to fig. 10, fig. 10 is a schematic structural diagram of a device for determining a synchronous reference source according to an embodiment of the present disclosure.

As shown in fig. 10, the apparatus 1000 for determining a synchronization reference source includes: a transceiver unit 1010 and a processing unit 1020, wherein:

a transceiving unit 1010 for first information related to a synchronization reference source;

a processing unit 1020, configured to determine a target synchronization reference source of the first terminal device according to the first information;

Optionally, the first information is sent by the second terminal device and/or the access network device.

Optionally, the target synchronization reference source is a synchronization reference source dedicated for sidelink positioning, or the target synchronization reference source is a synchronization reference source shared by sidelink positioning and sidelink communication.

Optionally, the first information is used to determine a priority of the at least one synchronization reference source type.

Optionally, the first information is at least one of: global navigation satellite system GNSS priority; the access network equipment takes precedence; sidelink terminal equipment takes precedence.

Optionally, in response to that the priority information is a GNSS priority, the processing unit 1020 is specifically configured to: and determining the GNSS as a target synchronous reference source of the first terminal equipment.

Optionally, the processing unit 1020 is further configured to: and in response to failing to acquire the GNSS as the target synchronization reference source, determining a sidelink terminal device as the target synchronization reference source for the first terminal device.

Optionally, the first information is used to indicate at least one candidate synchronization reference source.

the side link synchronization sequence identifier SL SSID of the terminal equipment as the candidate synchronization reference source;

an indication of coverage of the terminal device as the candidate synchronization reference source;

the side-link synchronization signal block SL SSB time domain distribution information of the terminal equipment as the candidate synchronization reference source;

the sidelink layer 2 identification of the terminal equipment as the candidate synchronous reference source;

a sidelink positioning reference signal SL PRS mark of the terminal equipment as the candidate synchronous reference source;

the type of the candidate synchronous reference source is GNSS;

and the access network equipment identification is used as the candidate synchronization reference source.

Optionally, in response to the first information indicating a plurality of candidate synchronization reference sources, the first information further includes priorities of the plurality of candidate synchronization reference sources.

Optionally, in response to the first information including priority information and first indication information, wherein the priority information is used for determining the priority of at least one synchronization reference source type, the first indication information is used for indicating at least one candidate synchronization reference source; the processing unit 1020 is specifically configured to: and determining a target synchronization reference source of the first terminal equipment from at least one candidate synchronization reference source indicated by the first indication information.

Optionally, in response to failing to acquire the at least one candidate synchronization reference source indicated by the first indication information, the processing unit 1020 is specifically configured to: and determining a target synchronous reference source of the first terminal equipment according to the priority information.

Optionally, in response to failing to acquire the at least one candidate synchronization reference source indicated by the first indication information, the transceiving unit 1010 is further configured to: sending feedback information to at least one of the second terminal device, the access network device and the core network device; the feedback information is used for indicating that the first terminal equipment cannot synchronize with the indicated target synchronization reference source.

Optionally, in response to the first information being sent by the second terminal device, the first information is included in at least one of the following messages: a sidelink location protocol message; bottom layer direct connection cellular communication protocol PC5 message; sidelink radio resource control RRC message.

Optionally, in response to the first information being sent by the core network device through the access network device, the first information is included in an LTE positioning protocol LPP message.

Optionally, in response to the first information being sent by the access network device, the first information is included in at least one of the following messages: a system broadcasts a message; a radio resource control, RRC, reconfiguration message; radio resource control, RRC, connection release message.

Optionally, in response to receiving a broadcast message and a first terminal device specific message, both of which include the first information, the processing unit 1020 is further configured to:

and determining a target synchronization reference source of the first terminal equipment according to the first information in the special message of the first terminal equipment.

Optionally, in response to receiving the first information sent by the second terminal device and the access network device, the processing unit 1020 is further configured to: and determining a target synchronization reference source of the first terminal equipment according to the first information sent by the second terminal equipment.

Optionally, the first information further includes second indication information, where the second indication information is used to indicate an effective time of the first information.

Optionally, the first information further includes at least one of the following information: the Reference Signal Received Power (RSRP) absolute threshold value of the target synchronous reference source; the Reference Signal Received Power (RSRP) of the target synchronous reference source is relative to a threshold value; layer 3 filter coefficients of the target synchronous reference source; the RSRP absolute threshold or the RSRP relative threshold is used to determine a candidate synchronization reference source that meets the RSRP absolute threshold or the RSRP relative threshold requirement as the target synchronization reference source; the target synchronization reference source is a sidelink terminal device.

Optionally, the first terminal device and the second terminal device are sidelink terminal devices, and the sidelink terminal devices include at least one of: a primary positioning auxiliary terminal device; positioning an auxiliary terminal device; the terminal device being located.

The apparatus for determining a synchronization reference source according to this embodiment may determine, according to first information sent by at least one of the second terminal device, the access network device, and the core network device, a target synchronization reference source of the first terminal device according to the first information, where the target synchronization reference source is used for positioning the sidelink, so that each terminal device participating in positioning the sidelink may perform clock synchronization based on the same synchronization reference source, and eliminate clock source offset between each positioning auxiliary terminal device as much as possible, thereby effectively improving accuracy and precision of a positioning result of the sidelink, and improving positioning efficiency.

Referring to fig. 11, fig. 11 is a schematic structural diagram of a device for determining a synchronization reference source according to an embodiment of the present disclosure.

As shown in fig. 11, the apparatus 1100 for determining a synchronization reference source includes: a transceiving unit 1110, wherein:

a transceiving unit 1110, configured to send first information related to a synchronization reference source to a first terminal device;

Optionally, the first information is at least one of: global navigation satellite system GNSS priority; the access network equipment takes precedence; sidelink terminal devices take precedence.

Optionally, in response to the priority information being GNSS priority, the first information is used to determine GNSS as a target synchronization reference source of the first terminal device.

Optionally, in response to that the first terminal device cannot acquire the GNSS as the target synchronization reference source, the first information is used to determine a sidelink terminal device as the target synchronization reference source of the first terminal device.

the type of the candidate synchronous reference source is GNSS;

Optionally, in response to the first information including priority information and first indication information, the priority information is used for determining the priority of at least one synchronization reference source type, and the first indication information is used for indicating at least one candidate synchronization reference source; the first indication information is used for determining a target synchronization reference source of the first terminal equipment.

Optionally, in response to that the first terminal device cannot acquire at least one candidate synchronization reference source indicated by the first indication information, the priority information is used to determine a target synchronization reference source of the first terminal device.

Optionally, in response to that the first terminal device cannot acquire the at least one candidate synchronization reference source indicated by the first indication information, the transceiving unit 1110 is further configured to: receiving feedback information sent by the first terminal equipment; the feedback information is used for indicating that the first terminal equipment cannot be synchronized with the indicated target synchronization reference source.

Optionally, the first information is included in at least one of the following messages: a sidelink positioning protocol message; bottom layer direct connection cellular communication protocol PC5 message; sidelink radio resource control RRC message.

Optionally, the first information further includes at least one of the following information: the Reference Signal Received Power (RSRP) absolute threshold value of the target synchronous reference source; the Reference Signal Received Power (RSRP) of the target synchronous reference source is relative to a threshold value; layer 3 filter coefficients of the target synchronous reference source; the RSRP absolute threshold or the RSRP relative threshold is used to determine a candidate synchronization reference source that meets the RSRP absolute threshold or the RSRP relative threshold requirement as the target synchronization reference source; the target synchronization reference source is sidelink terminal equipment.

The device for determining the synchronous reference source of this embodiment may send the first information to the first terminal device, where the first information is used to determine the target synchronous reference source of the first terminal device, so that each terminal device participating in the sidelink positioning can perform clock synchronization based on the same synchronous reference source, thereby eliminating clock source deviation between each positioning auxiliary terminal device as much as possible, and thus, the accuracy and precision of the sidelink positioning result can be effectively improved, and the positioning efficiency is improved.

Referring to fig. 12, fig. 12 is a schematic structural diagram of a device for determining a synchronization reference source according to an embodiment of the present disclosure.

As shown in fig. 12, the apparatus 1200 for determining a synchronization reference source includes: a transceiving unit 1210, wherein:

a transceiving unit 1210, configured to send first information related to a synchronization reference source to a first terminal device;

Optionally, the transceiver 1210 is further configured to: and receiving the first information sent by the access network equipment.

Optionally, the target synchronization reference source is a synchronization reference source dedicated to sidelink positioning, or the target synchronization reference source is a synchronization reference source shared by sidelink positioning and sidelink communication.

the time domain allocation information of the sidelink synchronization signal block SL SSB of the terminal equipment as the candidate synchronization reference source;

the type of the candidate synchronous reference source is GNSS;

Optionally, in response to the first information including priority information and first indication information, wherein the priority information is used for determining the priority of at least one synchronization reference source type, the first indication information is used for indicating at least one candidate synchronization reference source; the first indication information is used for determining a target synchronization reference source of the first terminal equipment.

Optionally, in response to that the first terminal device cannot acquire the at least one candidate synchronization reference source indicated by the first indication information, the transceiving unit 1210 is further configured to: receiving feedback information sent by the first terminal equipment; the feedback information is used for indicating that the first terminal equipment cannot synchronize with the indicated target synchronization reference source.

Optionally, the first information is included in at least one of the following messages: a system broadcasts a message; a radio resource control, RRC, reconfiguration message; radio resource control, RRC, connection release message.

Optionally, the first information is included in an LTE positioning protocol, LPP, message.

Optionally, the first terminal device is a sidelink terminal device, and the sidelink terminal device includes at least one of: a primary positioning auxiliary terminal device; positioning an auxiliary terminal device; the terminal device being located.

Referring to fig. 13, fig. 13 is a schematic structural diagram of a device for determining a synchronization reference source according to an embodiment of the present disclosure.

As shown in fig. 13, the apparatus 1300 for determining a synchronization reference source includes: a transceiving unit 1310, wherein:

a transceiving unit 1310 configured to transmit first information to a first terminal device;

Optionally, in response to the priority information being GNSS priority, the first information is used to determine a GNSS as a target synchronization reference source of the first terminal device.

the type of the candidate synchronous reference source is GNSS;

Optionally, in response to the first information including priority information and first indication information, wherein the priority information is used for determining the priority of at least one synchronization reference source type, the first indication information is used for indicating at least one candidate synchronization reference source; the first indication information is used for determining a target synchronization reference source of the first terminal device.

Optionally, in response to that the first terminal device cannot acquire the at least one candidate synchronization reference source indicated by the first indication information, the transceiving unit 1310 is further configured to: receiving feedback information sent by the first terminal equipment; the feedback information is used for indicating that the first terminal equipment cannot synchronize with the indicated target synchronization reference source.

In order to implement the foregoing embodiments, an embodiment of the present application further provides a communication apparatus, including: a processor and a memory, the memory having stored therein a computer program, the processor executing the computer program stored in the memory to cause the apparatus to perform the method shown in the embodiment of fig. 2-6, or to perform the method shown in the embodiment of fig. 7.

In order to implement the foregoing embodiments, an embodiment of the present application further provides a communication apparatus, including: a processor and a memory, the memory having stored therein a computer program, the processor executing the computer program stored in the memory to cause the apparatus to perform the method shown in the embodiment of fig. 8, or to perform the method shown in the embodiment of fig. 9.

In order to implement the foregoing embodiments, an embodiment of the present application further provides a communication apparatus, including: a processor and interface circuitry to receive and transmit code instructions to the processor, the processor to execute the code instructions to perform the method of the embodiments of figures 2 to 6 or to perform the method of the embodiment of figure 7.

In order to implement the foregoing embodiments, an embodiment of the present application further provides a communication apparatus, including: a processor and interface circuitry to receive and transmit code instructions to the processor, the processor to execute the code instructions to perform the method of the embodiment of fig. 8 or to perform the method of the embodiment of fig. 9.

Referring to fig. 14, fig. 14 is a schematic structural diagram of another apparatus for determining a synchronization reference source according to an embodiment of the present disclosure. The apparatus 1400 for determining a synchronization reference source may be a network device, a terminal device, a chip system, a processor, or the like, which supports the network device to implement the method described above, or a chip, a chip system, a processor, or the like, which supports the terminal device to implement the method described above. The apparatus may be configured to implement the method described in the foregoing method embodiment, and specific reference may be made to the description in the foregoing method embodiment.

The synchronization reference determination apparatus 1400 may include one or more processors 1401. Processor 1401 may be a general purpose processor, or a special purpose processor, etc. For example, a baseband processor or a central processor. The baseband processor may be configured to process communication protocols and communication data, and the central processor may be configured to control the determination device (e.g., the base station, the baseband chip, the terminal device chip, the DU or CU, etc.) of the synchronization reference source, execute a computer program, and process data of the computer program.

Optionally, the apparatus 1400 for determining a synchronization reference source may further include one or more memories 1402, on which a computer program 1403 may be stored, and the processor 1401 executes the computer program 1403 to enable the apparatus 1400 for determining a synchronization reference source to perform the method described in the above method embodiment. The computer program 1403 may be solidified in the processor 1401, in which case the processor 1401 may be implemented by hardware.

Optionally, data may also be stored in the memory 1402. The apparatus 1400 for determining a synchronization reference source and the memory 1402 may be provided separately or integrated together.

Optionally, the apparatus 1400 for determining a synchronization reference source may further include a transceiver 1405 and an antenna 1406. The transceiver 1405 may be referred to as a transceiving unit, a transceiver, or a transceiving circuit, etc. for implementing a transceiving function. The transceiver 1405 may include a receiver and a transmitter, and the receiver may be referred to as a receiver or a receiving circuit, etc. for implementing a receiving function; the transmitter may be referred to as a transmitter or a transmission circuit, etc. for implementing the transmission function.

Optionally, the apparatus 1400 for determining a synchronization reference source may further include one or more interface circuits 1407. Interface circuit 1407 is used to receive code instructions and transmit them to processor 1401. The processor 1401 runs the code instructions to cause the determination means 1400 of the synchronization reference source to perform the method described in the above method embodiment.

In one implementation, a transceiver to perform receive and transmit functions may be included in processor 1401. The transceiver may be, for example, a transceiver circuit, or an interface circuit. The transceiver circuitry, interface or interface circuitry for implementing the receive and transmit functions may be separate or integrated. The transceiver circuit, the interface circuit or the interface circuit may be used for reading and writing code/data, or the transceiver circuit, the interface circuit or the interface circuit may be used for transmitting or transferring signals.

In one implementation, the device 1400 for determining a synchronization reference source may include a circuit, which may implement the functions of transmitting or receiving or communicating in the foregoing method embodiments. The processors and transceivers described herein may be implemented on Integrated Circuits (ICs), analog ICs, radio Frequency Integrated Circuits (RFICs), mixed signal ICs, application Specific Integrated Circuits (ASICs), printed Circuit Boards (PCBs), electronic devices, and the like. The processor and transceiver may also be fabricated using various IC process technologies such as Complementary Metal Oxide Semiconductor (CMOS), N-type metal oxide semiconductor (NMOS), P-type metal oxide semiconductor (PMOS), bipolar Junction Transistor (BJT), bipolar CMOS (BiCMOS), silicon germanium (SiGe), gallium arsenide (GaAs), etc.

The determination apparatus of the synchronization reference source in the above description of the embodiment may be a network device or a terminal device, but the scope of the determination apparatus of the synchronization reference source described in the present application is not limited thereto, and the structure of the determination apparatus of the synchronization reference source may not be limited by fig. 10 to fig. 13. The means for determining the synchronization reference source may be a stand-alone device or may be part of a larger device. For example, the determination means of the synchronization reference source may be:

(1) A stand-alone integrated circuit IC, or chip, or system-on-chip or subsystem;

(2) A set of one or more ICs, which may optionally also include storage means for storing data, computer programs;

(3) An ASIC, such as a Modem (Modem);

(4) A module that may be embedded within other devices;

(5) Receivers, terminal devices, smart terminal devices, cellular phones, wireless devices, handsets, mobile units, in-vehicle devices, network devices, cloud devices, artificial intelligence devices, and the like;

(6) Others, etc.

For the case that the determination device of the synchronization reference source may be a chip or a chip system, the schematic structural diagram of the chip shown in fig. 15 may be referred to. The chip shown in fig. 15 includes a processor 1501 and an interface 1502. The number of the processors 1501 may be one or more, and the number of the interfaces 1502 may be more.

For the case that the chip is used for realizing the functions of the terminal device in the embodiment of the present application:

an interface 1502 for code instructions and transmission to the processor;

a processor 1501 for executing the code instructions to perform the method of fig. 2 to 6, or to perform the method of fig. 7.

For the case that the chip is used to implement the functions of the network device in the embodiment of the present application:

an interface 1502 for code instructions and transmission to the processor;

a processor 1501 for executing code instructions to perform a method as in fig. 8, or to perform a method as in fig. 8.

Optionally, the chip further comprises a memory 1503, the memory 1503 being used for storing necessary computer programs and data.

Those skilled in the art will also appreciate that the various illustrative logical blocks and steps (step) set forth in the embodiments of the present application may be implemented in electronic hardware, computer software, or combinations of both. Whether such functionality is implemented as hardware or software depends upon the particular application and design requirements of the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the embodiments of the present application.

An embodiment of the present application further provides a communication system, where the system includes the foregoing determining apparatus as the synchronization reference source of the terminal device and the foregoing determining apparatus as the synchronization reference source of the network device in the embodiments of fig. 10 to fig. 13, or the system includes the foregoing determining apparatus as the synchronization reference source of the terminal device and the foregoing determining apparatus as the synchronization reference source of the network device in the embodiment of fig. 14.

The present application further provides a readable storage medium having stored thereon instructions which, when executed by a computer, implement the functionality of any of the above-described method embodiments.

The present application also provides a computer program product which, when executed by a computer, implements the functionality of any of the above-described method embodiments.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs. The procedures or functions according to the embodiments of the present application are wholly or partially generated when the computer program is loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer program can be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer program can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a Digital Video Disk (DVD)), or a semiconductor medium (e.g., a Solid State Disk (SSD)), among others.

Those of ordinary skill in the art will understand that: the various numbers of the first, second, etc. mentioned in this application are only used for the convenience of description and are not used to limit the scope of the embodiments of this application, but also to indicate the sequence.

At least one of the present application may also be described as one or more, and a plurality may be two, three, four or more, and the present application is not limited thereto. In the embodiment of the present application, for a technical feature, the technical features in the technical feature are distinguished by "first", "second", "third", "a", "B", "C", and "D", and the like, and the technical features described in "first", "second", "third", "a", "B", "C", and "D" are not in a sequential order or a size order.

The correspondence shown in the tables in the present application may be configured or predefined. The values of the information in each table are only examples, and may be configured to other values, which is not limited in the present application. When the correspondence between the information and each parameter is configured, it is not always necessary to configure all the correspondences indicated in each table. For example, in the table in the present application, the correspondence shown in some rows may not be configured. For another example, appropriate modification adjustments, such as splitting, merging, etc., can be made based on the above tables. The names of the parameters in the tables may be other names understandable by the communication device, and the values or the expression of the parameters may be other values or expressions understandable by the communication device. When the above tables are implemented, other data structures may be used, for example, arrays, queues, containers, stacks, linear tables, pointers, linked lists, trees, graphs, structures, classes, heaps, hash tables, or hash tables may be used.

Predefinition in this application may be understood as defining, predefining, storing, pre-negotiating, pre-configuring, curing, or pre-firing.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the embodiments of the present application may be executed in parallel, sequentially, or in different orders, and the present invention is not limited herein as long as the desired results of the technical solutions disclosed in the present invention can be achieved.

The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for determining a synchronization reference source, the method being performed by a first terminal device, the method comprising:

receiving first information related to a synchronization reference source;

2. The method of claim 1, wherein the first information is sent by at least one of:

a second terminal device;

access network device

A core network device.

3. The method of claim 1,

the target synchronous reference source is a synchronous reference source special for positioning a sidelink; or

The target synchronization reference source is a synchronization reference source shared by sidelink positioning and sidelink communication.

4. Method according to claim 2 or 3, wherein said first information is used for determining a priority of at least one synchronization reference source type.

5. The method of claim 4, wherein the first information is at least one of:

global navigation satellite system GNSS priority;

the access network equipment takes precedence;

sidelink terminal equipment takes precedence.

6. The method of claim 5, wherein in response to the priority information being GNSS priority, the determining a target synchronization reference source for the first terminal device based on the first information comprises:

and determining a GNSS as a target synchronous reference source of the first terminal equipment.

7. The method of claim 6, further comprising:

and in response to failing to acquire the GNSS as the target synchronization reference source, determining a sidelink terminal device as the target synchronization reference source for the first terminal device.

8. The method according to claim 2 or 3, wherein the first information is used for indicating at least one candidate synchronization reference source.

9. The method of claim 8, wherein the first information is used to indicate at least one of the following information:

a sidelink synchronization sequence identifier SL SSID of the terminal equipment as the candidate synchronization reference source;

the terminal equipment serving as the candidate synchronization reference source has side uplink synchronization signal block SL SSB time domain allocation information;

a sidelink layer 2 identifier of the terminal device as the candidate synchronization reference source;

a sidelink positioning reference signal (SL PRS) identification of the terminal equipment as the candidate synchronous reference source;

the type of the candidate synchronous reference source is GNSS;

and the access network equipment identification is taken as the candidate synchronization reference source.

10. The method of claim 8, wherein in response to the first information indicating a plurality of candidate synchronization reference sources, the first information further comprises priorities of the plurality of candidate synchronization reference sources.

11. The method according to claim 4 or 8, wherein in response to the first information comprising priority information and first indication information, wherein the priority information is used for determining the priority of at least one synchronization reference source type, the first indication information is used for indicating at least one candidate synchronization reference source;

the determining a target synchronization reference source of the first terminal device according to the first information includes:

and determining a target synchronization reference source of the first terminal device from at least one candidate synchronization reference source indicated by the first indication information.

12. The method of claim 11, wherein in response to failing to obtain at least one candidate synchronization reference source indicated by the first indication information, the determining a target synchronization reference source of the first terminal device according to the first information comprises:

and determining a target synchronization reference source of the first terminal equipment according to the priority information.

13. The method of claim 11, wherein in response to failing to obtain at least one candidate synchronization reference source indicated by the first indication information, the method further comprises:

sending feedback information to at least one of the second terminal device, the access network device and the core network device;

the feedback information is used for indicating that the first terminal equipment cannot synchronize with the indicated target synchronization reference source.

14. The method according to any of claims 2-13, wherein in response to the first information being sent by the second terminal device, the first information is included in at least one of the following messages:

a sidelink location protocol message;

bottom layer direct connection cellular communication protocol PC5 message;

sidelink radio resource control, RRC, message.

15. The method of any of claims 2-13, wherein the first information is included in an LTE positioning protocol, LPP, message in response to the first information being sent by a core network device through the access network device.

16. The method of any of claims 2-13, wherein in response to the first information being sent by the access network device, the first information is included in at least one of:

a system broadcasts a message;

a radio resource control, RRC, reconfiguration message;

radio resource control, RRC, connection release message.

17. The method of claim 14 or 16, wherein in response to receiving a broadcast message and a first terminal device specific message, both the broadcast message and the first terminal device specific message including the first information, the method further comprises:

18. The method of claim 14 or 16, wherein in response to receiving the first information sent by the second terminal device and the access network device, the method further comprises:

and determining a target synchronous reference source of the first terminal equipment according to the first information sent by the second terminal equipment.

19. The method according to any one of claims 2-18, wherein the first information further comprises second indication information, and the second indication information is used for indicating the effective time of the first information.

20. The method according to any of claims 2-18, wherein the first information further comprises at least one of:

a Reference Signal Received Power (RSRP) absolute threshold value of the target synchronous reference source;

the Reference Signal Received Power (RSRP) of the target synchronous reference source is relative to a threshold value;

layer 3 filter coefficients of the target synchronous reference source;

wherein the RSRP absolute threshold value or the RSRP relative threshold value is used for determining a candidate synchronization reference source meeting the RSRP absolute threshold value or the RSRP relative threshold value requirement as the target synchronization reference source;

the target synchronous reference source is side link terminal equipment.

21. The method according to any of claims 2-20, wherein the first terminal device and the second terminal device are sidelink terminal devices, and wherein the sidelink terminal devices comprise at least one of:

a primary positioning auxiliary terminal device;

positioning an auxiliary terminal device;

a terminal device being located.

22. A method for determining a synchronization reference source, the method being performed by a second terminal device, the method comprising:

sending first information related to a synchronous reference source to first terminal equipment; the first information is used for determining a target synchronization reference source of the first terminal equipment;

23. The method of claim 22,

24. The method according to claim 22 or 23, wherein the first information is used for determining a priority of at least one synchronization reference source type.

25. The method of claim 24, wherein the first information is at least one of:

global navigation satellite system GNSS priority;

the access network equipment takes precedence;

sidelink terminal equipment takes precedence.

26. The method of claim 25, wherein in response to the priority information being GNSS priority, the first information is used to determine GNSS as a target synchronization reference source for the first terminal device.

27. The method of claim 26, wherein the first information is used to determine a sidelink terminal device as the target synchronization reference source for the first terminal device in response to the first terminal device failing to acquire the GNSS as the target synchronization reference source.

28. The method according to claim 22 or 23, wherein the first information is used to indicate at least one candidate synchronization reference source.

29. The method of claim 28, wherein the first information is used to indicate at least one of the following information:

the type of the candidate synchronous reference source is GNSS;

30. The method of claim 28, wherein in response to the first information indicating a plurality of candidate synchronization reference sources, the first information further comprises priorities of the plurality of candidate synchronization reference sources.

31. The method according to claim 24 or 28, wherein in response to the first information comprising priority information for determining a priority of at least one synchronization reference source type and first indication information for indicating at least one candidate synchronization reference source;

the first indication information is used for determining a target synchronization reference source of the first terminal device.

32. The method of claim 31, wherein the priority information is used for determining a target synchronization reference source of the first terminal device in response to the first terminal device failing to obtain at least one candidate synchronization reference source indicated by the first indication information.

33. The method of claim 31, wherein in response to the first terminal device failing to obtain at least one candidate synchronization reference source indicated by the first indication information, the method further comprises:

receiving feedback information sent by the first terminal equipment;

34. The method according to any of claims 22-33, wherein the first information is included in at least one of the following messages:

a sidelink location protocol message;

bottom layer direct connection cellular communication protocol PC5 message;

sidelink radio resource control, RRC, message.

35. The method according to any of claims 22-34, wherein the first information further comprises second indication information, the second indication information indicating an effective time of the first information.

36. The method of any one of claims 22-34, wherein the first information further comprises at least one of:

layer 3 filter coefficients of the target synchronous reference source;

the target synchronous reference source is side link terminal equipment.

37. The method of any of claims 22-36, wherein the first terminal device and the second terminal device are sidelink terminal devices, and wherein the sidelink terminal devices comprise at least one of:

a primary positioning auxiliary terminal device;

positioning an auxiliary terminal device;

a terminal device being located.

38. A method for determining a synchronization reference source, the method being performed by an access network device, the method comprising:

39. The method of claim 38, further comprising:

and receiving the first information sent by the core network equipment.

40. The method of claim 38 or 39,

41. The method according to any of claims 38-40, wherein said first information is used for determining a priority of at least one synchronization reference source type.

42. The method of claim 41, wherein the first information is at least one of:

global navigation satellite system GNSS priority;

the access network equipment takes precedence;

sidelink terminal devices take precedence.

43. The method of claim 42, wherein in response to the priority information being GNSS priority, the first information is used to determine GNSS as a target synchronization reference source for the first terminal device.

44. The method of claim 43, wherein the first information is utilized to determine a sidelink terminal device as a target synchronization reference source for the first terminal device in response to the first terminal device failing to acquire the GNSS as the target synchronization reference source.

45. The method of any of claims 38-40, wherein the first information is used to indicate at least one candidate synchronization reference source.

46. The method of claim 45, wherein the first information is used to indicate at least one of the following information:

coverage indication of the terminal device as the candidate synchronization reference source;

a sidelink layer 2 identifier of the terminal equipment as the candidate synchronous reference source;

the type of the candidate synchronous reference source is GNSS;

47. The method of claim 45, wherein in response to the first information indicating a plurality of candidate synchronization reference sources, the first information further comprises priorities of the plurality of candidate synchronization reference sources.

48. The method of claim 41 or 45, wherein in response to the first information comprising priority information and first indication information, the priority information is used for determining the priority of at least one synchronization reference source type, and the first indication information is used for indicating at least one candidate synchronization reference source;

the first indication information is used for determining a target synchronization reference source of the first terminal equipment.

49. The method of claim 48, wherein the priority information is used for determining a target synchronization reference source of the first terminal device in response to the first terminal device failing to obtain at least one candidate synchronization reference source indicated by the first indication information.

50. The method of claim 48, wherein in response to the first terminal device failing to obtain at least one candidate synchronization reference source indicated by the first indication information, the method further comprises:

receiving feedback information sent by the first terminal equipment;

the feedback information is used for indicating that the first terminal equipment cannot be synchronized with the indicated target synchronization reference source.

51. The method according to any of claims 38,40-50, wherein the first information is included in at least one of the following messages:

a system broadcasts a message;

a radio resource control, RRC, reconfiguration message;

radio resource control, RRC, connection release message.

52. The method according to any of the claims 39-50, wherein the first information is comprised in an LTE positioning protocol, LPP, message.

53. The method according to any of claims 38-52, wherein the first information further comprises second indication information, the second indication information indicating an effective time of the first information.

54. The method of any one of claims 38-52, wherein the first information further comprises at least one of:

layer 3 filter coefficients of the target synchronous reference source;

and the target synchronous reference source is sidelink terminal equipment.

55. The method of any of claims 38-54, wherein the first terminal device is a sidelink terminal device, and wherein the sidelink terminal device comprises at least one of:

a primary positioning auxiliary terminal device;

positioning an auxiliary terminal device;

the terminal device being located.

56. A method for determining a synchronization reference source, the method being performed by a core network device, the method comprising:

sending first information to first terminal equipment;

57. The method as claimed in claim 56, wherein the target synchronization reference source is a synchronization reference source dedicated for sidelink positioning or a synchronization reference source shared for sidelink positioning and sidelink communication.

58. The method according to claim 56 or 57, wherein said first information is used for determining a priority of at least one synchronization reference source type.

59. The method of claim 58, wherein the first information is at least one of:

global navigation satellite system GNSS priority;

the access network equipment takes precedence;

sidelink terminal equipment takes precedence.

60. The method of claim 59, wherein in response to the priority information being GNSS priority, the first information is used to determine GNSS as a target synchronization reference source for the first terminal device.

61. The method of claim 60, wherein the first information is used to determine a sidelink terminal device as the target synchronization reference source for the first terminal device in response to the first terminal device failing to acquire the GNSS as the target synchronization reference source.

62. The method according to claim 56 or 57, wherein the first information is used for indicating at least one candidate synchronization reference source.

63. The method of claim 62, wherein the first information is used to indicate at least one of the following information:

the type of the candidate synchronous reference source is GNSS;

64. The method of claim 62, wherein in response to the first information indicating a plurality of candidate synchronization reference sources, the first information further comprises priorities of the plurality of candidate synchronization reference sources.

65. The method according to claim 58 or 62, wherein in response to the first information comprising priority information for determining a priority of at least one synchronization reference source type and first indication information for indicating at least one candidate synchronization reference source;

66. The method according to claim 65, wherein the priority information is used for determining a target synchronization reference source of the first terminal device in response to the first terminal device failing to obtain at least one candidate synchronization reference source indicated by the first indication information.

67. The method according to claim 65, wherein in response to the first terminal device failing to acquire at least one candidate synchronization reference source indicated by the first indication information, the method further comprises:

receiving feedback information sent by the first terminal equipment;

68. The method according to any of the claims 56-68, wherein said first information is comprised in an LTE positioning protocol, LPP, message.

69. The method according to any one of claims 56-68, wherein said first information further comprises second indication information, said second indication information being used to indicate time of effectiveness of said first information.

70. The method according to any one of claims 56-68, wherein the first information further comprises at least one of:

layer 3 filter coefficients of the target synchronous reference source;

wherein the RSRP absolute threshold or the RSRP relative threshold is used for determining a candidate synchronization reference source meeting the RSRP absolute threshold or the RSRP relative threshold requirement as the target synchronization reference source;

the target synchronous reference source is side link terminal equipment.

71. The method of any of claims 56-68, wherein the first terminal device is a sidelink terminal device, and wherein the sidelink terminal device comprises at least one of:

a primary positioning auxiliary terminal device;

positioning an auxiliary terminal device;

a terminal device being located.

72. An apparatus for determining a synchronization reference source, the apparatus being applied to a first terminal device, the apparatus comprising:

a transceiving unit for receiving first information related to a synchronization reference source;

73. An apparatus for determining a synchronization reference source, the apparatus being applied to a second terminal device, the apparatus comprising:

74. An apparatus for determining a synchronization reference source, the apparatus being applied to an access network device, the apparatus comprising:

75. An apparatus for determining a synchronization reference source, the apparatus being applied to a core network device, the apparatus comprising:

76. A communications apparatus, comprising a processor and a memory, the memory having stored therein a computer program, the processor executing the computer program stored in the memory to cause the apparatus to perform the method of any of claims 1 to 21, or to perform the method of any of claims 22 to 37, or to perform the method of any of claims 38 to 55, or to perform the method of any of claims 56-71.

77. A computer-readable storage medium storing instructions that, when executed, cause a method of any one of claims 1-21 to be implemented, or cause a method of any one of claims 22-37 to be implemented, or cause a method of any one of claims 38-55 to be implemented, or cause a method of any one of claims 56-71 to be implemented.