CN116567569A

CN116567569A - Direct link positioning synchronization method, device, communication equipment and storage medium

Info

Publication number: CN116567569A
Application number: CN202210114466.9A
Authority: CN
Inventors: 张静文; 纪鹏宇; 张嘉真
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Priority date: 2022-01-30
Filing date: 2022-01-30
Publication date: 2023-08-08
Also published as: WO2023143002A1

Abstract

The embodiment of the invention discloses a direct link positioning and synchronizing method, a device, communication equipment and a storage medium. The method comprises the following steps: the first terminal transmits a direct link synchronization signal (SLSS)/physical layer direct link broadcast channel (PSBCH) transmission when at least one of the following conditions is satisfied: the first terminal has a position service request; configuring or pre-configuring the first terminal to send SLSS/PSBCH transmission; the SLSS/PSBCH transmission is used for other terminals to search for and select a reference synchronization source, which is used for direct link communication.

Description

Direct link positioning synchronization method, device, communication equipment and storage medium

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a direct link positioning synchronization method, a device, a communication device, and a storage medium.

Background

In a car networking (V2X, vehicle to Everything) scenario, positioning under a scenario without network coverage (e.g., a car driving into a tunnel, a natural disaster infrastructure being damaged, etc.) and relative position positioning are considered, and direct link (sidelink) positioning needs to be enabled. If the direct link positioning is enabled, not all terminals currently transmit the SLSS, but transmit the direct link synchronization signal (SLSS, sidlink Synchronization Signal) when a certain condition is met, so that the terminals communicating with each other do not necessarily synchronize to each other.

Disclosure of Invention

In order to solve the existing technical problems, the embodiment of the invention provides a direct link positioning and synchronizing method, a device, communication equipment and a storage medium.

In order to achieve the above object, the technical solution of the embodiment of the present invention is as follows:

in a first aspect, an embodiment of the present invention provides a method for positioning and synchronizing a direct link, where the method includes:

the first terminal transmits a SLSS/physical layer direct link broadcast channel (PSBCH, physical Sidelink Broadcast Channel) transmission when at least one of the following conditions is satisfied:

the first terminal has a position service request;

configuring or pre-configuring the first terminal to send SLSS/PSBCH transmission;

the SLSS/PSBCH transmission is used for other terminals to search for and select a reference synchronization source, which is used for direct link communication.

In the above scheme, before the first terminal sends the SLSS/PSBCH transmission, the method further includes:

the first terminal determines an identification of the SLSS, determines time domain resources of the SLSS, and generates the SLSS based on the identification of the SLSS.

In the above solution, in the case of configuring or pre-configuring the first terminal to send an SLSS/PSBCH transmission, the method further includes:

The first terminal configures or pre-configures first information, wherein the first information comprises at least one of the following: reference is made to synchronization source indication information, time division duplex (TDD, time Division Duplexing) configuration information, and timing offset compensation information.

In the above solution, in the case that the first terminal has a location service request, the method further includes: and configuring or pre-configuring TDD configuration information in the first terminal.

In the above solution, when the first terminal has a location service request, the determining, by the first terminal, the identifier of the SLSS includes:

the higher layer of the first terminal indicates the identity of the SLSS.

In the above solution, in case that the first terminal has a location service request, the SLSS includes an identifier of the first terminal.

the first terminal determines an identification of the SLSS, determines time domain resources of the SLSS, and generates the SLSS based on the identification of the SLSS and/or the identification of the first terminal.

In the above scheme, the method further comprises: the first terminal receives the first information sent by the network equipment.

In the above scheme, the PSBCH carries the TDD configuration information.

In a second aspect, an embodiment of the present invention further provides a direct link positioning synchronization method, where the method includes:

the second terminal searches candidate SLSS/PSBCH transmission;

the second terminal has a location service request, or the second terminal receives the location service request.

In the above scheme, the method further comprises:

when the second terminal detects that the receiving power (PSBCH-RSRP) of a physical layer direct link broadcast channel corresponding to at least one candidate SLSS exceeds the minimum requirement, the second terminal selects one terminal as a reference synchronization source according to the priority order of the terminals corresponding to the candidate SLSS;

wherein, the PSBCH-RSRP corresponding to the reference synchronous source in the same priority group is the largest.

In the above solution, in the case that the second terminal receives the location service request, the SLSS includes an identifier of the terminal.

In a third aspect, the embodiment of the present invention further provides a direct link positioning synchronization device, where the device is applied to a first terminal; the device comprises: a first processing unit and a first communication unit; wherein,,

the first processing unit is configured to determine whether a condition is satisfied, and trigger the first communication unit when at least one of the following conditions is satisfied: the first terminal has a position service request; configuring or pre-configuring to transmit SLSS/PSBCH transmissions;

The first communication unit is used for sending SLSS/PSBCH transmission; the SLSS/PSBCH transmission is used for other terminals to search for and select a reference synchronization source, which is used for direct link communication.

In a fourth aspect, the embodiment of the invention also provides a direct link positioning and synchronizing device, which is applied to the second terminal; the device comprises: a second communication unit for searching candidate SLSS/PSBCH transmission;

the second terminal has a location service request, or the second terminal receives the location service request through the second communication unit.

In a fifth aspect, embodiments of the present invention also provide a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of the method according to the first or second aspect of the embodiments of the present invention.

In a sixth aspect, the present embodiment further provides a communication device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor executes the program to implement the steps of the method according to the first aspect or the second aspect of the present embodiment.

The embodiment of the invention provides a direct link positioning and synchronizing method, a device, communication equipment and a storage medium, wherein the method comprises the following steps: the first terminal transmits the SLSS/PSBCH transmission when at least one of the following conditions is satisfied: the first terminal has a position service request; configuring or pre-configuring the first terminal to send SLSS/PSBCH transmission; the SLSS/PSBCH transmission is used for other terminals to search for and select a reference synchronization source, which is used for direct link communication. By adopting the technical scheme of the embodiment of the invention, on one hand, under the condition of configuring or pre-configuring SLSS/PSBCH transmission, a first terminal sends the SLSS/PSBCH transmission so that other terminals search the SLSS/PSBCH and select a reference synchronization source based on the searched SLSS/PSBCH; on the other hand, in the case that the first terminal has a location request (i.e., the first terminal serves as a terminal to be located, there is a location requirement), the SLSS/PSBCH transmission is transmitted by the first terminal, so that other terminals assisting in location search and select a reference synchronization source, thereby realizing various transmission conditions of the SLSS/PSBCH transmission, and enabling terminals communicating with each other to synchronize to each other.

Drawings

Fig. 1 is a flowchart of a direct link positioning synchronization method according to an embodiment of the present invention;

fig. 2 is a second flow chart of a direct link positioning synchronization method according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a composition structure of a direct link positioning and synchronizing device according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a second component structure of a direct link positioning and synchronizing device according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a hardware composition structure of a communication device according to an embodiment of the present invention.

Detailed Description

The invention will be described in further detail with reference to the accompanying drawings and specific examples.

The technical scheme of the embodiment of the invention can be applied to various communication systems, such as: global system for mobile communications (GSM, global System of Mobile communication), long term evolution (LTE, long Term Evolution) or 5G systems, etc. Alternatively, the 5G system or 5G network may also be referred to as a New Radio (NR) system or NR network.

By way of example, the communication system to which the embodiments of the present invention are applied may include network devices and terminal devices (may also be referred to as terminals, communication terminals, etc.); the network device may be a device in communication with the terminal device. Wherein the network device may provide communication coverage for a range of areas and may communicate with terminals located within the areas. Alternatively, the network device may be a base station in each communication system, such as an evolved base station (eNB, evolutional Node B) in an LTE system, and also such as a base station (gNB) in a 5G system or an NR system.

It should be understood that a device having a communication function in a network/system in an embodiment of the present application may be referred to as a communication device. The communication device may include a network device and a terminal having a communication function, where the network device and the terminal device may be the specific devices described above, and are not described herein; the communication device may also include other devices in the communication system, such as a network controller, a mobility management entity, and other network entities, which are not limited in this embodiment of the present invention.

It should be understood that the terms "system" and "network" are used interchangeably herein. The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be capable of operation in sequences other than those illustrated or described herein, for example. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Before explaining the direct link positioning synchronization scheme of the embodiment of the present invention, a direct link synchronization mechanism is first briefly explained.

The positioning principle based on the air interface is that reference signals are transmitted between a terminal to be positioned and a plurality of base stations to obtain measurement data such as timing information or angles, and positioning is performed based on the measurement data obtained from the plurality of base stations. In this case, the uplink and downlink timings of the terminals are synchronized to the serving base station; for the base station, the global positioning system (GPS, global Positioning System) is used to obtain time service (i.e. with the same synchronization source), that is, parties involved in positioning (such as terminals, serving base stations, neighbor base stations, positioning servers, etc.) have a consistent understanding of timing.

The direct link synchronization mechanism is different from the air interface positioning. A direct link (sidelink) supports various types of synchronization sources including, for example, global navigation satellite systems (GNSS, global Navigation Satellite System), cell (cell) devices (e.g., base stations), reference user equipments (reference UEs, reference User Equipment), etc., from which a terminal may obtain timing information. In addition, currently, sidelink supports two synchronization priority types, synchronization based on GNSS (GNSS-based) and synchronization based on gNB/eNB (gNB/eNB-based), and the direct link synchronization priority type of a certain terminal is configured by the network (pre). The two synchronization priorities are defined differently for each synchronization source, as shown in table 1 below. Taking the GNSS-based synchronization priority as an example, the GNSS itself has the highest priority P0, and when one terminal can directly synchronize to the GNSS, its synchronization priority is P1, and so on.

TABLE 1

Priority level	GNSS-based synchronization	gNB/eNB based synchronization
			P0	GNSS	gNB/eNB
P1	UE direct synchronization to GNSS	Direct synchronization of UE to gNB/eNB
			P2	UE indirect synchronization to GNSS	Indirect synchronization of UE to gNB/eNB
P3	gNB/eNB	GNSS
			P4	Direct synchronization of UE to gNB/eNB	UE direct synchronization to GNSS
P5	Indirect synchronization of UE to gNB/eNB	UE indirect synchronization to GNSS
			P6	Other UE (Any other UE)	Other UE (Any other UE)

In addition, the transmission trigger conditions and transmission rules of the direct link synchronization signal (SLSS) are currently specified in detail, and not all terminals will transmit the SLSS, and if and only if a specified series of conditions are satisfied, the terminals will transmit the SLSS.

The embodiment of the invention provides a direct link positioning and synchronizing method which is applied to a first terminal. Fig. 1 is a flowchart of a direct link positioning synchronization method according to an embodiment of the present invention; as shown in fig. 1, the method includes:

step 101: the first terminal transmits the SLSS/PSBCH transmission when at least one of the following conditions is satisfied:

the first terminal has a position service request;

configuring or pre-configuring the first terminal to send SLSS/PSBCH;

In this embodiment, on the one hand, in the case of configuring or pre-configuring the SLSS/PSBCH transmission, the first terminal transmits the SLSS/PSBCH transmission, so that the other terminals search for the SLSS/PSBCH and select a reference synchronization source based on the searched SLSS/PSBCH; on the other hand, in the case that the first terminal has a location request (i.e., the first terminal serves as a terminal to be located, there is a location requirement), the SLSS/PSBCH transmission is transmitted by the first terminal, so that other terminals assisting in location search and select a reference synchronization source, thereby realizing various transmission conditions of the SLSS/PSBCH transmission, and enabling terminals communicating with each other to synchronize to each other.

In this embodiment, the SLSS/PSBCH transmission is illustratively transmitted through a block (block), which may be, for example, a Synchronization Signal Block (SSB), in which different time-frequency resources are defined for the SLSS and PSBCH.

In some alternative embodiments of the present invention, before the first terminal sends the SLSS/PSBCH transmission, the method further includes: the first terminal determines an identification of the SLSS, determines time domain resources of the SLSS, and generates the SLSS based on the identification of the SLSS.

In this embodiment, the first terminal determines the identification of the SLSS (SLSS ID) according to the configuration or pre-configuration rule. The configured or preconfigured rules may include, for example, a mapping of trigger conditions, synchronization sources (or reference synchronization sources), and identification of SLSS. The first terminal may determine an identification (SLSS ID) of the corresponding SLSS according to the trigger condition currently satisfied and the current synchronization source (or reference synchronization source) of the first terminal.

Correspondingly, the first terminal may also determine the time domain resource of the SLSS according to a configuration or a preconfigured rule. The configuration or pre-configured rules may include, for example, a trigger condition, a synchronization source (or reference synchronization source), and a mapping of time domain resources of the SLSS. The first terminal may determine the time domain resource of the corresponding SLSS according to the trigger condition currently satisfied and the current synchronization source (or reference synchronization source) of the first terminal. The time domain resource of the SLSS may specifically be an SLSS slot (SLSS slot).

In this embodiment, the first terminal may generate the SLSS based on an identification of the SLSS (SLSS ID). Illustratively, the SLSS may be generated based on the SLSS sequence and PSBCH demodulation reference signal (DMRS, demodulation Reference Signal) sequence initialization seed generation pattern.

In some optional embodiments of the invention, in case the first terminal is configured or preconfigured to send an SLSS/PSBCH transmission, the method further comprises: the first terminal configures or pre-configures first information, wherein the first information comprises at least one of the following: reference is made to synchronization source indication information, TDD configuration information, and timing offset compensation information.

Optionally, in some optional embodiments, the reference synchronization source indicated by the reference synchronization source indication information may be a GNSS or a cell, etc.; illustratively, a cell as a reference synchronization source represents a serving base station (e.g., gNB/eNB) as a reference synchronization source.

In this embodiment, the timing offset compensation information corresponds to the first terminal, that is, in the case of configuring or pre-configuring the first information of the SLSS/PSBCH transmission, the timing offset compensation information configured or pre-configured by each terminal (including the first terminal) may be the same or different. Since the locations of the terminals (including the first terminal) are different, in the case where the terminals (including the first terminal) are configured or preconfigured with the first information of the SLSS/PSBCH transmission as the assisted positioning terminals, and in the case where the reference synchronization sources indicated in the configured first information are the same, by configuring or preconfiguring the timing offset compensation information corresponding to the terminals (including the first terminal), the other terminals (including the first terminal) are caused to recognize the terminals (including the first terminal) as having the same reference synchronization source.

In the conventional direct link (sidelink) technology, two communicating parties are not necessarily synchronized with each other and may be synchronized with different synchronization sources, so that the problem of asynchronous timing occurs, and it is difficult to apply a positioning technology requiring timing synchronization such as time difference of arrival (TDOA, time Difference of Arrival).

Exemplary TDOA locations include: and a plurality of Road Side Units (RSUs) send direct link (sidelink) positioning reference signals, and a terminal to be positioned arranged on a vehicle measures the arrival time difference of the positioning reference signals between every two RSUs to position. According to a direct link (sidelink) synchronization mechanism, multiple RSUs may synchronize to different synchronization sources, which are difficult to synchronize with each other in timing.

In the present embodiment, the timing offset compensation information enables other terminals (terminals to be located) to identify each terminal (including the first terminal) as having the same reference synchronization source, so as to solve the problem of timing asynchronization.

In this embodiment, the TDD configuration information is used to determine time domain resources available for a direct link (sidelink).

In some alternative embodiments, the PSBCH carries the TDD configuration information.

Currently, the time domain resources available for the direct link (sidelink) are derived from the uplink resources in the TDD configuration. If the terminal can access the network (the terminal has Uu port and is in coverage (in-coverage)), the complete TDD configuration of the network configuration can be obtained; otherwise, the terminal can only follow the preconfigured TDD configuration or synchronize to the reference terminal (reference UE), and acquire the TDD configuration by reading the SLSS/PSBCH sent by the reference terminal. Taking as an example the acquisition of TDD configuration by reading SLSS/PSBCH sent by reference terminal (reference UE), limited by payload (payload) of PSBCH, its TDD configuration indication granularity is limited (for the case of larger subcarrier spacing, TDD period is longer, indication granularity may be 2, 4, 8 slots), so its indicated TDD configuration may not coincide with the actual TDD configuration of the network configuration. For example, there are 11 Uplink (UL) slots (slots) in the TDD configuration of a particular cell (cell-specific), and the PSBCH indicates granularity of 4slots, so that a terminal synchronized to a reference terminal (reference UE) can only read 8 UL slots. This can affect an inconsistent understanding of the available resources of the direct link (sidelink) between the terminal and the reference terminal, resulting in an inability to measure each other between the two terminals.

In the embodiment of the invention, the TDD configuration information transmitted by the SLSS/PSBCH is configured or preconfigured, and the TDD configuration information is the TDD configuration which is consistently understood by the receiving and transmitting terminals, for example, the TDD configuration information is matched with the PSBCH indication granularity, so that the consistent understanding of the terminal on the available resources (TDD configuration) of the direct link (sidelink) can be realized.

In some alternative embodiments, the method further comprises: the first terminal receives the first information sent by the network equipment.

In this embodiment, before the first terminal sends the SLSS/PSBCH transmission, the first terminal receives the first information sent by the network device, and the first terminal sends the SLSS/PSBCH transmission according to at least one of reference synchronization source indication information, TDD configuration information, and timing offset compensation information indicated by the first information.

In some optional embodiments of the invention, in case the first terminal has a location service request, the first terminal determines an identification of the SLSS, including: the higher layer of the first terminal indicates the identity of the SLSS.

In this embodiment, in the case that the first terminal has a location service request, that is, in the case that the first terminal is a terminal to be located, the higher layer (higher layer) of the first terminal may indicate the identification of the SLSS. The higher layer (higher layer) may be an application layer, for example.

In this embodiment, the first terminal has a location service request, and specifically, the first terminal may send a location request. The first terminal may send the positioning request in a broadcast manner, or in a unicast manner or a multicast manner.

Optionally, when the first terminal sends the positioning request, the identifier of the SLSS is sent, that is, the identifier of the SLSS is sent to other terminals (terminals for assisting positioning) through the positioning request, so that when the other terminals (terminals for assisting positioning) search for the SLSS/PSBCH transmission, the searched SLSS/PSBCH is determined to be sent by the first terminal with the positioning request according to the searched identifier of the SLSS.

In other optional embodiments, in the case that the first terminal has a location service request, the first terminal may also determine an identifier of the SLSS (SLSS ID) according to a configuration or pre-configuration rule, and determine a time domain resource of the SLSS according to the configuration or pre-configuration rule, where a specific determination manner may be described in the foregoing embodiments and will not be repeated herein.

In some optional embodiments of the invention, in case of a location service request by the first terminal, the identification of the first terminal is included in the SLSS.

In this embodiment, the identifier of the first terminal is carried in the SLSS, so that other terminals (terminals for assisting in positioning) can be synchronized to the first terminal (terminal to be positioned) according to the identifier of the first terminal.

Accordingly, optionally, before the first terminal sends the SLSS/PSBCH transmission, the method further includes: the first terminal determines an identification of the SLSS, determines time domain resources of the SLSS, and generates the SLSS based on the identification of the SLSS and/or the identification of the first terminal.

For example, the lower 10 bits (PSCCH CRC 10bit LSB) of the cyclic redundancy check (CRC, cyclic Redundancy Check) of the corresponding physical direct link control channel (PSCCH, physical Sidelink Control Channel) check bits when the terminal to be positioned sends a positioning request

In this embodiment, the first terminal may determine the identifier of the SLSS according to the determination manner of the identifier of any one of the SLSS, and determine the time domain resource of the SLSS; further, the SLSS may be generated based on the identifier of the first terminal, or may be generated based on the identifier of the SLSS and the identifier of the first terminal, or the first terminal may also generate the SLSS only according to the identifier of the SLSS, for example, generate the SLSS based on the SLSS sequence and the PSBCH DMRS sequence by initializing a seed generation manner.

In some optional embodiments of the invention, in case the first terminal has a location service request, the method further comprises: and configuring or pre-configuring TDD configuration information in the first terminal.

In some alternative embodiments, the PSBCH carries configured or preconfigured TDD configuration information.

In this embodiment, the first terminal configures or pre-configures TDD configuration information, where the TDD configuration information is used to determine time domain resources available for a direct link (sidelink). For example, when the first terminal has a location service request and before the first terminal sends an SLSS/PSBCH transmission, TDD configuration information sent by the network device may be received, and when the SLSS/PSBCH transmission is sent, configured or preconfigured TDD configuration information is carried through the PSBCH. The TDD configuration information is a TDD configuration that is consistently understood by both the transceiver terminals, for example, the TDD configuration information is matched with PSBCH indication granularity, so that consistent understanding of the terminal on available resources (TDD configuration) of a direct link (sidelink) can be achieved.

In this embodiment, the above configuration or preconfigured rule may be shown with reference to table 2, for example. As shown In table 2, for example, under the first trigger condition, i.e., the first terminal is In coverage (In-coverage), and/or the broadcast message (sib 12) or dedicated signaling (dedicated signaling) configures the terminal to perform SLSS/PSBCH transmission, when the synchronization source is GNSS, the SLSS ID is 0, when the synchronization source is Cell, the SLSS ID is a selected one of {1, …,335}, and the SLSS slot (slot) is time allocation1.

Under the second trigger condition, that is, under the condition that the first terminal is Pre-configured, when the synchronization source is GNSS, the SLSS ID is 0, the SLSS slot (slot) is time allocation3, under the condition that it is configured (if configured), and under the condition that it is not configured, the SLSS slot (slot) is time allocation1.

Under the third trigger condition, that is, under the condition that the first terminal is other than the two trigger conditions, when the synchronization source is the reference terminal (ReferenceUE) and the reference terminal is in the coverage range (incov=true), the SLSS ID is the reference direct link SSID (Ref SL SSID) (that is, the SSID of the reference terminal), and the SLSS time slot is time allocation1or2, which is different from the reference terminal (different from Ref UE). In the case where the synchronization source is a reference terminal (reference ue) and the reference terminal is not in coverage (incov=false), and the SSID of the reference terminal is one of {336, …,671}, the SLSS ID is the reference direct link SSID (Ref SL SSID) (i.e., the SSID of the reference terminal), and the SLSS slot is time allocation1or2, which is different from the reference terminal (different from Ref UE). In the case where the synchronization source is a reference terminal (reference ue) and the SLSS slot of the reference terminal is time allocation3, the SLSS ID is 337 and the SLSS slot is time allocation2. In the case where the synchronization source is a reference terminal (reference ue), the SLSS ID is a reference direct link ssid+336 (Ref SL ssid+336) (i.e., ssid+336 of the reference terminal), and the SLSS slot is time allocation1or2, unlike the reference terminal (different from Ref UE). In the case where the synchronization source is not the reference terminal (No reference ue), the SLSS ID is one of {338, …,671} and the SLSS slot is time allocation1or 2.

TABLE 2

Based on the above embodiment, the embodiment of the present invention further provides a direct link positioning synchronization method, which is applied to the second terminal. Fig. 2 is a second flow chart of a direct link positioning synchronization method according to an embodiment of the present invention; as shown in fig. 2, the method includes:

step 201: the second terminal searches candidate SLSS/PSBCH transmission; wherein the second terminal has a location service request, or the second terminal receives the location service request.

In this embodiment, the second terminal corresponds to the other terminals in the foregoing embodiment, and in the case that the first terminal has a location service request, that is, the first terminal is used as a terminal to be located, the second terminal receives the location service request, specifically, may receive the location service request sent by the first terminal, that is, the second terminal is used as a terminal for auxiliary location; in the case that the second terminal has a location service request, that is, the second terminal is used as a terminal to be located, the first terminal configures or pre-configures the first information transmitted by the SLSS/PSBCH, and the first terminal is used as a terminal for auxiliary location.

In some alternative embodiments of the invention, the method further comprises:

step 202: when the second terminal detects that the PSBCH-reference signal received power (RSRP, reference Signal Receiving Power) corresponding to at least one candidate SLSS exceeds the minimum requirement, the second terminal selects one terminal as a reference synchronization source according to the priority order of the terminals corresponding to the candidate SLSS; wherein, the PSBCH-RSRP corresponding to the reference synchronous source in the same priority group is the largest.

In this embodiment, the second terminal searches for each candidate SLSS/PSBCH transmission, and selects one terminal as the reference synchronization source based on the priority order of the terminals corresponding to at least one candidate SLSS when it is found that the PSBCH-RSRP corresponding to at least one candidate SLSS exceeds the minimum requirement. Optionally, the priority corresponding to the selected reference synchronization source is highest; and if the number of the terminals with the highest priority is at least two, selecting the terminal with the largest PSBCH-RSRP from the at least two terminals with the highest priority as a reference synchronization source.

In one possible implementation, the PSBCH-RSRP exceeding the minimum requirement may specifically be that the PSBCH-RSRP exceeds a preset threshold.

In some optional embodiments of the invention, in case the second terminal receives a location service request, the SLSS includes an identification of the terminal.

The following describes a direct link positioning synchronization method according to an embodiment of the present invention with reference to some specific examples.

Example one

In this example, the first terminal is used as a terminal for assisting positioning, and the other terminals (such as the second terminal) are terminals with location service requests, and the first terminal may receive the location service requests of the other terminals (such as the second terminal).

The first terminal configures or pre-configures SLSS/PSBCH transmission, and the first terminal configures or pre-configures first information; wherein the first information includes reference synchronization source indication information, TDD configuration information, and timing offset compensation information.

And the first terminal determines SLSS ID and time domain resources (such as SLSSB-TimeAllocation Pos 1) of the SLSS according to the configuration or pre-configuration rule, and generates the SLSS based on the SLSS ID and sends SLSS/PSBCH transmission.

When the second terminal needs to perform positioning, searching for candidate SLSS/PSBCH transmission, wherein each candidate SLSS/PSBCH transmission can be sent by each first terminal for configuring or pre-configuring SLSS/PSBCH transmission.

When the second terminal detects that the PSBCH-RSRP corresponding to at least one candidate SLSS exceeds the minimum requirement, the second terminal selects one terminal as a reference synchronization source according to the priority order of the terminals corresponding to the candidate SLSS; wherein, the PSBCH-RSRP corresponding to the reference synchronous source in the same priority group is the largest.

Example two

In this example, the first terminal is taken as a terminal to be located, and other terminals (such as the second terminal) are terminals that receive the location service request.

And when the first terminal has a position service request, the SLSS/PSBCH transmission is sent. Wherein optionally, the SLSS may include an identification of the first terminal.

As one way, the first terminal may determine the SLSS ID and determine the time domain resource of the SLSS (e.g., sl-SSB-time allocation pos 2) according to the above configuration or preconfigured rule, and the first terminal generates the SLSS based on the SLSS ID. Wherein, alternatively, the first terminal may generate the SLSS based on the SLSS ID and the identification of the first terminal, or the first terminal may generate the SLSS based on the identification of the first terminal.

As another way, a higher layer (higher layer) of the first terminal indicates the SLSS ID, and determines a time domain resource of the SLSS according to the above configuration or preconfigured rule, and the first terminal generates the SLSS based on the SLSS ID.

The second terminal, which is a secondary positioning terminal, searches for candidate SLSS/PSBCH transmissions, each of which may be sent by each of the first terminals.

Based on the above embodiment, the embodiment of the present invention further provides a direct link positioning synchronization device, which is applied to the first terminal. Fig. 3 is a schematic diagram of a composition structure of a direct link positioning and synchronizing device according to an embodiment of the present invention; as shown in fig. 3, the apparatus includes: a first processing unit 31 and a first communication unit 32; wherein,,

the first processing unit 31 is configured to determine whether a condition is satisfied, and trigger the first communication unit 32 when at least one of the following conditions is satisfied: the first terminal has a position service request; configuring or pre-configuring to transmit SLSS/PSBCH transmissions;

the first communication unit 32 is configured to send an SLSS/PSBCH transmission; the SLSS/PSBCH transmission is used for other terminals to search for and select a reference synchronization source, which is used for direct link communication.

In some optional embodiments of the invention, the first processing unit 31 is further configured to determine an identifier of the SLSS, determine a time domain resource of the SLSS, and generate the SLSS based on the identifier of the SLSS before the first communication unit 32 sends the SLSS/PSBCH transmission.

In some alternative embodiments of the present invention, in case of configuring or pre-configuring the sending SLSS/PSBCH transmission, the first processing unit 31 is further configured to configure or pre-configure first information, the first information comprising at least one of: reference is made to synchronization source indication information, TDD configuration information, and timing offset compensation information.

In some alternative embodiments of the present invention, the first communication unit 32 is further configured to receive the first information sent by the network device.

In some alternative embodiments of the invention, the PSBCH carries the TDD configuration information.

In some alternative embodiments of the present invention, the first processing unit 31 is further configured to configure or pre-configure TDD configuration information in case the first terminal has a location service request.

In some alternative embodiments of the present invention, in case the first terminal has a location service request, the first processing unit 31 is configured to indicate, by a higher layer of the first terminal, an identification of the SLSS.

In some optional embodiments of the invention, the first processing unit 31 is configured to determine an identifier of the SLSS and determine a time domain resource of the SLSS before the first communication unit 32 sends the SLSS/PSBCH transmission, and generate the SLSS based on the identifier of the SLSS and/or the identifier of the first terminal.

In the embodiment of the present invention, the first processing unit 31 in the device may be implemented by a central processing unit (CPU, central Processing Unit), a digital signal processor (DSP, digital Signal Processor), a micro control unit (MCU, microcontroller Unit) or a programmable gate array (FPGA, field-Programmable Gate Array) in practical application; the first communication unit 32 in the device can be realized by a communication module (including a basic communication suite, an operating system, a communication module, a standardized interface, a standardized protocol, and the like) and a transceiver antenna in practical application.

Based on the above embodiment, the embodiment of the present invention further provides a direct link positioning synchronization device, which is applied to the second terminal. Fig. 4 is a schematic diagram of a second component structure of a direct link positioning and synchronizing device according to an embodiment of the present invention; as shown in fig. 4, the apparatus includes: a second communication unit 41 for searching for candidate SLSS/PSBCH transmissions;

wherein the second terminal has a location service request or the second terminal receives a location service request through the second communication unit 41.

In some optional embodiments of the present invention, the apparatus further includes a second processing unit 42, configured to select, when it is detected that the PSBCH-RSRP corresponding to at least one candidate SLSS exceeds the minimum requirement, one terminal as the reference synchronization source according to the priority order of the terminals corresponding to the candidate SLSS; wherein, the PSBCH-RSRP corresponding to the reference synchronous source in the same priority group is the largest.

In some alternative embodiments of the present invention, in case the second terminal receives a location service request through the second communication unit 41, the identification of the terminal is included in the SLSS.

In the embodiment of the present invention, the second processing unit 42 in the device may be implemented by CPU, DSP, MCU or FPGA in practical application; the second communication unit 41 in the device can be realized by a communication module (including a basic communication suite, an operating system, a communication module, a standardized interface, a standardized protocol, and the like) and a transceiver antenna in practical application.

It should be noted that: in the direct link positioning synchronization device provided in the above embodiment, only the division of each program module is used for illustration when the direct link positioning synchronization is performed, and in practical application, the processing allocation may be completed by different program modules according to needs, that is, the internal structure of the device is divided into different program modules to complete all or part of the processing described above. In addition, the direct link positioning synchronization device provided in the above embodiment and the direct link positioning synchronization method embodiment belong to the same concept, and detailed implementation processes of the direct link positioning synchronization device are referred to the method embodiment, and are not repeated here.

Based on the foregoing embodiments, the embodiments of the present invention further provide a communication device, where the communication device is a terminal (e.g., a first terminal and/or a second terminal) in the foregoing embodiments. Fig. 5 is a schematic diagram of a hardware composition structure of a communication device according to an embodiment of the present invention, as shown in fig. 5, the communication device includes a memory 52, a processor 51, and a computer program stored in the memory 52 and capable of running on the processor 51, where the steps of the direct link positioning synchronization method applied to a first terminal are implemented when the processor 51 executes the program; alternatively, the processor 51 implements the step of the direct link positioning synchronization method applied to the second terminal when executing the program.

Optionally, the communication device further comprises at least one network interface 53. Wherein the various components of the communication device are coupled together by a bus system 54. It is understood that the bus system 54 is used to enable connected communications between these components. The bus system 54 includes a power bus, a control bus, and a status signal bus in addition to the data bus. But for clarity of illustration the various buses are labeled as bus system 54 in fig. 5.

It will be appreciated that the memory 52 can be either volatile memory or nonvolatile memory, and can include both volatile and nonvolatile memory. Wherein the nonvolatile Memory may be Read Only Memory (ROM), programmable Read Only Memory (PROM, programmable Read-Only Memory), erasable programmable Read Only Memory (EPROM, erasable Programmable Read-Only Memory), electrically erasable programmable Read Only Memory (EEPROM, electrically Erasable Programmable Read-Only Memory), magnetic random access Memory (FRAM, ferromagnetic Random Access Memory), flash Memory (Flash Memory), magnetic surface Memory, optical disk, or compact disk Read Only Memory (CD-ROM, compact Disc Read-Only Memory); the magnetic surface memory may be a disk memory or a tape memory. The volatile memory may be random access memory (RAM, random Access Memory), which acts as external cache memory. By way of example, and not limitation, many forms of RAM are available, such as static random access memory (SRAM, static Random Access Memory), synchronous static random access memory (SSRAM, synchronous Static Random Access Memory), dynamic random access memory (DRAM, dynamic Random Access Memory), synchronous dynamic random access memory (SDRAM, synchronous Dynamic Random Access Memory), double data rate synchronous dynamic random access memory (ddr SDRAM, double Data Rate Synchronous Dynamic Random Access Memory), enhanced synchronous dynamic random access memory (ESDRAM, enhanced Synchronous Dynamic Random Access Memory), synchronous link dynamic random access memory (SLDRAM, syncLink Dynamic Random Access Memory), direct memory bus random access memory (DRRAM, direct Rambus Random Access Memory). The memory 52 described in embodiments of the present invention is intended to comprise, without being limited to, these and any other suitable types of memory.

The method disclosed in the above embodiment of the present invention may be applied to the processor 51 or implemented by the processor 51. The processor 51 may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in the processor 51 or by instructions in the form of software. The processor 51 may be a general purpose processor, DSP, or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. The processor 51 may implement or perform the methods, steps and logic blocks disclosed in embodiments of the present invention. The general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the method disclosed in the embodiment of the invention can be directly embodied in the hardware of the decoding processor or can be implemented by combining hardware and software modules in the decoding processor. The software modules may be located in a storage medium in a memory 52. The processor 51 reads information in the memory 52 and, in combination with its hardware, performs the steps of the method as described above.

In an exemplary embodiment, the communication device may be implemented by one or more application specific integrated circuits (ASIC, application Specific Integrated Circuit), DSP, programmable logic device (PLD, programmable Logic Device), complex programmable logic device (CPLD, complex Programmable Logic Device), FPGA, general purpose processor, controller, MCU, microprocessor, or other electronic element for performing the aforementioned methods.

In an exemplary embodiment, the present invention also provides a computer readable storage medium, such as a memory 52, comprising a computer program executable by the processor 51 of the communication device to perform the steps of the method described above. The computer readable storage medium may be FRAM, ROM, PROM, EPROM, EEPROM, flash Memory, magnetic surface Memory, optical disk, or CD-ROM; but may be a variety of devices including one or any combination of the above memories.

The embodiment of the invention provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the steps of the direct link positioning synchronization method applied to a first terminal; alternatively, the program when executed by the processor implements the steps of the direct link positioning synchronization method applied to the second terminal.

The methods disclosed in the several method embodiments provided in the present application may be arbitrarily combined without collision to obtain a new method embodiment.

The features disclosed in the several product embodiments provided in the present application may be combined arbitrarily without conflict to obtain new product embodiments.

The features disclosed in the several method or apparatus embodiments provided in the present application may be arbitrarily combined without conflict to obtain new method embodiments or apparatus embodiments.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above described device embodiments are only illustrative, e.g. the division of the units is only one logical function division, and there may be other divisions in practice, such as: multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. In addition, the various components shown or discussed may be coupled or directly coupled or communicatively coupled to each other via some interface, whether indirectly coupled or communicatively coupled to devices or units, whether electrically, mechanically, or otherwise.

The units described as separate units may or may not be physically separate, and units displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units; some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated in one processing unit, or each unit may be separately used as one unit, or two or more units may be integrated in one unit; the integrated units may be implemented in hardware or in hardware plus software functional units.

Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the above method embodiments may be implemented by hardware associated with program instructions, where the foregoing program may be stored in a computer readable storage medium, and when executed, the program performs steps including the above method embodiments; and the aforementioned storage medium includes: a removable storage device, ROM, RAM, magnetic or optical disk, or other medium capable of storing program code.

Alternatively, the above-described integrated units of the present invention may be stored in a computer-readable storage medium if implemented in the form of software functional modules and sold or used as separate products. Based on such understanding, the technical solutions of the embodiments of the present invention may be embodied in essence or a part contributing to the prior art in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a removable storage device, ROM, RAM, magnetic or optical disk, or other medium capable of storing program code.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for positioning and synchronizing a direct link, the method comprising:

the first terminal transmits a direct link synchronization signal SLSS/physical layer direct link broadcast channel PSBCH transmission when at least one of the following conditions is satisfied:

the first terminal has a position service request;

2. The method of claim 1, wherein prior to the first terminal transmitting the SLSS/PSBCH transmission, the method further comprises:

3. The method of claim 1, wherein in the case of configuring or pre-configuring the first terminal to transmit SLSS/PSBCH transmissions, the method further comprises:

the first terminal configures or pre-configures first information, wherein the first information comprises at least one of the following: reference is made to synchronization source indication information, time division duplex, TDD, configuration information, and timing offset compensation information.

4. The method of claim 1, wherein in the case of a location service request by the first terminal, the method further comprises: and configuring or pre-configuring TDD configuration information in the first terminal.

5. The method of claim 2, wherein the first terminal determining the identity of the SLSS if the first terminal has a location service request, comprising:

the higher layer of the first terminal indicates the identity of the SLSS.

6. The method of claim 1, wherein the SLSS includes an identification of the first terminal in the case of a location service request by the first terminal.

7. The method of claim 6, wherein prior to the first terminal transmitting the SLSS/PSBCH transmission, the method further comprises:

8. A method according to claim 3, characterized in that the method further comprises:

the first terminal receives the first information sent by the network equipment.

9. The method of claim 3 or 4, wherein the PSBCH carries the TDD configuration information.

10. A method for positioning and synchronizing a direct link, the method comprising:

the second terminal searches candidate direct link synchronization signal SLSS/physical layer direct link broadcast channel PSBCH transmission;

11. The method according to claim 10, wherein the method further comprises:

when the second terminal detects that the receiving power PSBCH-RSRP of the physical layer direct link broadcast channel-reference signal corresponding to at least one candidate SLSS exceeds the minimum requirement, the second terminal selects one terminal as a reference synchronization source according to the priority order of the terminals corresponding to the candidate SLSS;

12. The method of claim 10, wherein the SLSS includes an identification of a terminal in the event that the second terminal receives a location service request.

13. A direct link positioning and synchronizing device, which is characterized in that the device is applied to a first terminal; the device comprises: a first processing unit and a first communication unit; wherein,,

the first processing unit is configured to determine whether a condition is satisfied, and trigger the first communication unit when at least one of the following conditions is satisfied: the first terminal has a position service request; configuring or pre-configuring transmission of a direct link synchronization signal SLSS/physical layer direct link broadcast channel PSBCH;

14. A direct link positioning and synchronizing device, which is characterized in that the device is applied to a second terminal; the device comprises: the second communication unit is used for searching candidate direct link synchronization signals SLSS/physical layer direct link broadcast channel PSBCH transmission;

15. A computer readable storage medium having stored thereon a computer program, characterized in that the program when executed by a processor realizes the steps of the method according to any of claims 1 to 9; or,

the program, when executed by a processor, implements the steps of the method of any of claims 10 to 12.

16. A communication device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method of any of claims 1 to 9 when the program is executed; or,

the processor, when executing the program, implements the steps of the method of any of claims 10 to 12.