WO2018032896A1

WO2018032896A1 - D2d synchronization signal sending method and apparatus

Info

Publication number: WO2018032896A1
Application number: PCT/CN2017/091719
Authority: WO
Inventors: 朱俊; 苏宏家; 庞继勇
Original assignee: 华为技术有限公司
Priority date: 2016-08-15
Filing date: 2017-07-04
Publication date: 2018-02-22
Also published as: CN107770781B; CN107770781A

Abstract

A D2D synchronization signal sending method and apparatus, for improving the success rate of synchronization establishment between a remote terminal within a network device coverage range and other terminals. The method comprises: a base station generating a cooperation instruction message, with the cooperation instruction message carrying identification information about a terminal needing to cooperatively send a D2D synchronization signal, and the cooperation instruction message being used for instructing at least two terminals corresponding to the identification information to cooperatively send the D2D synchronization signal; and the base station sending the cooperation instruction message. Therefore, by means of the method provided in the embodiments of the present invention, a plurality of terminals can cooperatively send a D2D synchronization signal, a coverage range of the D2D synchronization signal is improved, and the success rate of synchronization establishment between a remote terminal beyond a network device coverage range and other terminals is improved.

Description

D2D synchronization signal transmitting method and device

The present application claims priority to Chinese Patent Application No. 201610668068.6, entitled "D2D Synchronous Signal Transmission Method and Apparatus", filed on August 15, 2016, the entire contents of which are incorporated herein by reference. In the application.

Technical field

The present invention relates to the field of communications technologies, and in particular, to a D2D synchronization signal sending method and apparatus.

Background technique

As the number of communication devices continues to increase, the spectrum used for wireless communication becomes more and more crowded, and the air interface will become the main limiting factor for system expansion. D2D (Device to Device) communication, also known as ProSE (Proximity Service) communication, refers to direct communication between two communication devices (Direct STA-to-STA Transmission) in a wireless communication network. . Specifically, the signal transmission in the D2D session is implemented by using a wireless link, and the session in the conventional wireless communication network is a BS (Base Station) or an Access Point (AP) through two wireless links. The access point is implemented as a relay. For example, the terminal A communicates with the terminal B, and needs to be implemented by using the terminal A to the AP and the AP to the terminal B. Therefore, by introducing the D2D communication technology, the spectrum utilization efficiency of the wireless communication network can be improved, and the capacity of the air interface can also be improved.

At present, the scenarios supported by the 3GPP LTE D2D communication include three scenarios as shown in FIG. 1. The D2D/ProSE-capable terminals are all within the eNodeB (Evolved Node B) coverage (In-Coverage, IC). The D2D/ProSE capable terminals are all in non-eNodeB coverage (OoC), and the D2D/ProSE capable terminal parts are within the eNodeB coverage. To perform D2D communication between terminals, you must first synchronize between terminals. When multiple terminals that need to perform D2D communication are located within the coverage of the same eNodeB, multiple terminals can be synchronized to the eNodeB. When multiple terminals that need to perform D2D communication are partially located outside the coverage of the eNodeB or all are located outside the coverage of the eNodeB, additional D2D synchronization signals are needed to synchronize the terminals. The communication link between the terminal 1 and the terminal 2 in FIG. 1 is called an end-to-end link (Sidelink, SL), and the air interface between the terminal 1 and the terminal 2 is called a PC-5.

In the prior art, when the terminal is located in the IC within the coverage of the eNodeB, the conditions that the terminal needs to satisfy to transmit the D2D synchronization signal may be specifically classified into the following two cases:

a) When the terminal is in the RRC (Radio Resource Control) connection state, the eNodeB can set the terminal to send the D2D synchronization signal by using the networkControlledSyncTx element in the RRC connection reconfiguration message.

If the terminal is in the RRC idle state or does not receive the RRC connection reconfiguration message, and the terminal has the D2D discovery message or the D2D communication data needs to be sent, the terminal detects that the RSRP (Reference Signal Received Power) is smaller than the eNodeB. When the threshold (syncTxThreshIC) carried in the broadcast system information is transmitted, the terminal transmits a D2D synchronization signal.

For example, referring to FIG. 2, it is assumed that the range determined by the RSRP corresponding threshold is as shown by the dotted line in FIG. 2, and since the terminal 1 is within the dotted line range, that is, the detected RSRP is greater than the threshold, the D2D synchronization signal is not transmitted. The terminal 2 is outside the dotted line, that is, the detected RSRP is smaller than the threshold, so when the terminal 2 is in the RRC idle state or does not receive the RRC connection reconfiguration request, and the terminal has the D2D discovery message or the D2D communication data needs to be sent, the D2D synchronization signal is sent. .

In particular, for a scenario where the terminal is located in the non-eNodeB coverage OoC, when the terminal has a D2D discovery message or D2D communication data needs to be transmitted, if the terminal does not search for any D2D synchronization signal or detects the D2D synchronization signal, the end-to-end link is measured. The RSRP (Sidelink RSRP, S-RSRP) is smaller than a pre-configured threshold (for example, the out-of-coverage synchronization signal transmission threshold syncTxThreshOoC), and the terminal transmits a D2D synchronization signal.

As shown in FIG. 3, a terminal that is outside the coverage of the eNodeB can establish synchronization with a terminal located within the coverage of the eNodeB by means of chain synchronization. Specifically, in FIG. 3, the terminal 1 and the eNodeB first establish synchronization, and then the terminal 1 sends a D2D synchronization signal to establish synchronization between the terminal 2 and the terminal 1, and the terminal 3 establishes synchronization with the terminal 2, and the terminal 4 establishes synchronization with the terminal 3. However, the terminal 5 is far away from other terminals, and because the transmission power of the D2D synchronization signal is limited, the terminal 5 may not be able to receive the D2D synchronization signal sent by other terminals, and thus cannot establish synchronization with other terminals. In addition, the terminal 5 may also cause chain propagation interruption due to a certain relay node failure, so that synchronization with other terminals cannot be established. Therefore, the occurrence of the above situation may result in a lower success rate of establishing a synchronization between a remote terminal outside the coverage of the eNodeB and a terminal within the coverage of the eNodeB, thereby preventing the public safety information from being transmitted from the disaster site to the core network.

Summary of the invention

It is an object of the present invention to provide a D2D synchronization signal transmission method and apparatus for improving the success rate of establishing a synchronization between a remote terminal located outside the coverage of the network device and other terminals.

The object of the invention is achieved by the following technical solutions:

In a first aspect, a D2D synchronization signal sending method includes: a base station generates a cooperation indication message, where the cooperation indication message carries identifier information of a terminal that needs to cooperatively transmit a D2D synchronization signal, where the indication information is used to indicate that the identifier information corresponds to At least two terminals cooperatively transmit a D2D synchronization letter. Then, the base station sends the cooperation indication message. Therefore, the method provided by the embodiment of the present invention can implement multiple D2D synchronization signals in a plurality of terminals in the coverage of the base station, that is, at least two terminals corresponding to the identification information determine to send the same D2D synchronization signal according to the cooperation indication information, and implement multiple The same D2D synchronization signal is superimposed, which improves the coverage of the D2D synchronization signal and improves the success rate of the remote terminal establishing synchronization with other terminals.

In a possible implementation manner, the cooperation indication message further carries physical resource indication information, where the physical resource indication information is used to indicate that at least two terminals corresponding to the identification information use the same physical resource to jointly transmit a D2D synchronization signal. . Therefore, the method provided by the embodiment of the present invention ensures that multiple terminals cooperatively transmitting D2D synchronization signals simultaneously transmit D2D synchronization signals without interfering with each other, so as to improve the coverage of the D2D synchronization signal.

In a possible implementation, the identifier information is at least one collaboration group identifier, and each collaboration group identifier corresponds to one terminal set. Before the base station generates the cooperation indication message, the method further includes: the base station at least covers the coverage of the base station. A terminal is divided into at least one collaboration group, and each collaboration group is assigned a corresponding collaboration group identifier. Therefore, the method provided by the embodiment of the present invention can implement the base station to divide multiple cooperative groups around the edge of the coverage area, thereby effectively improving the efficiency of the multiple terminals cooperatively transmitting the D2D synchronization signal.

In a possible implementation, the base station divides at least one terminal in its coverage into at least a collaboration group, comprising: the base station according to location information of the at least one terminal, or battery capability information of the at least one terminal, or neighbor information corresponding to the at least one terminal, or D2D of the at least one terminal At least one of the capability information divides the at least one terminal into at least one collaboration group, wherein the neighbor information corresponding to each terminal is used to enable the base station to learn the identity of the terminal adjacent to the terminal. Therefore, the method provided by the embodiment of the present invention can implement the base station to divide the cooperation group according to the actual situation of each terminal, thereby effectively improving the efficiency of the multiple terminals cooperatively transmitting the D2D synchronization signal.

In a possible implementation manner, the collaboration indication message further carries a collaboration configuration parameter, where the collaboration configuration parameter is used to filter at least two terminals corresponding to the identifier information; the collaboration configuration parameter is at least one measurement The parameter corresponds to at least one of a threshold condition or at least one sector identifier. Therefore, the method provided by the embodiment of the present invention can implement further screening of the terminal, so as to effectively improve the efficiency of the multiple terminals cooperatively transmitting the D2D synchronization signal.

In a possible implementation, the indication information is further used to indicate that at least two terminals corresponding to the identifier information send a D2D system message, where the D2D system message is required by a terminal that receives the D2D synchronization signal. Known system public information. Therefore, the method provided by the embodiment of the present invention may be further used to indicate that at least two terminals corresponding to the identifier information send the D2D system information.

In a possible implementation manner, the identifier information is a D2D public identifier, and the D2D public identifier corresponds to all D2D-capable terminals in the coverage of the base station.

In a possible implementation manner, the sending, by the base station, the collaboration indication message includes: sending, by the base station, the collaboration indication message on a preset physical channel, where the preset physical channel is used to carry the collaboration indication The predetermined physical channel is a physical downlink control channel PDCCH.

A second aspect, a method for transmitting a D2D synchronization signal, comprising: receiving, by a first terminal, a cooperation indication message sent by a base station, where the cooperation indication message carries identifier information of a terminal that needs to cooperatively transmit a D2D synchronization signal, where the indication information is used to indicate The at least two terminals corresponding to the identifier information jointly transmit a D2D synchronization signal; when the first terminal determines that it is one of the at least two terminals corresponding to the identifier information, the D2D synchronization signal is sent.

In a possible implementation manner, the cooperation indication message further carries physical resource indication information, where the physical resource indication information is used to indicate that at least two terminals corresponding to the identification information use the same physical resource to jointly transmit a D2D synchronization signal. The first terminal sends a D2D synchronization signal, including:

The first terminal sends a D2D synchronization signal on the physical resource indicated by the physical resource indication information.

Therefore, the method provided by the embodiment of the present invention ensures that multiple terminals cooperatively transmitting D2D synchronization signals simultaneously transmit D2D synchronization signals without interfering with each other, so as to improve the coverage of the D2D synchronization signal.

In a possible implementation, the identifier information is at least one collaboration group identifier, and each collaboration group identifier corresponds to one terminal set; the first terminal determines that it is at least two terminals corresponding to the identifier information. At one time, the D2D synchronization signal is sent, and the D2D synchronization signal is sent when the first terminal determines that the collaboration group identifier corresponding to the collaboration group to which the first terminal belongs is one of the at least one collaboration group identifier. Therefore, the method provided by the embodiment of the present invention can effectively improve the efficiency of cooperatively transmitting D2D synchronization signals by multiple terminals.

In a possible implementation manner, the collaboration indication message further carries a collaboration configuration parameter, where the collaboration configuration parameter is used to filter at least two terminals corresponding to the identifier information; the collaboration configuration parameter is at least one measurement At least one of the threshold condition corresponding to the parameter or the at least one sector identifier; the first terminal transmitting the D2D synchronization signal, including: at least the measurement result of the first terminal corresponding to the at least one measurement parameter respectively Transmitting a D2D synchronization signal when a measurement result satisfies a corresponding threshold condition; and/or The first terminal transmits a D2D synchronization signal when determining that the sector identifier corresponding to the sector to which the sector belongs is one of the at least one sector identifier. Therefore, the method provided by the embodiment of the present invention can effectively improve the efficiency of cooperatively transmitting D2D synchronization signals by multiple terminals.

In a possible implementation, the indication information is further used to indicate that at least two terminals corresponding to the identifier information send a D2D system message, where the D2D system message is required by a terminal that receives the D2D synchronization signal. After the first terminal receives the cooperation indication message sent by the base station, the method further includes: when the first terminal determines that it is one of the at least two terminals corresponding to the identifier information, sending the D2D system message.

In a possible implementation manner, the identifier information is a D2D public identifier, where the D2D public identifier corresponds to all D2D-capable terminals in the coverage of the base station; and the first terminal determines that the identifier information is corresponding to the identifier information. When the D2D synchronization signal is sent, the first terminal determines that it is one of the D2D-capable terminals corresponding to the D2D public identifier, and sends a D2D synchronization signal.

In a possible implementation, the first terminal receives the cooperation indication message sent by the base station, where the first terminal receives the cooperation indication message sent by the base station on a preset physical channel, where the preset physical The channel is used to carry the cooperation indication message; the preset physical channel is a PDCCH.

In a third aspect, a D2D synchronization signal sending method includes: a first terminal generates a cooperative broadcast message, where the cooperative broadcast message carries a cooperation indication identifier, where the cooperation indication identifier indicates that a terminal that receives the cooperative broadcast message sends a D2D synchronization. a transmission condition that is required to be satisfied when the signal is transmitted; the first terminal transmits the cooperative broadcast message. Therefore, the multiple terminals that receive the cooperative broadcast message by using the method provided by the embodiment of the present invention transmit the D2D synchronization signal when determining that they meet the transmission condition, and the newly added cooperation indication identifier can be compatible with the existing manner of transmitting the D2D synchronization signal. A new transmission mode is proposed. Therefore, multiple UEs can cooperatively transmit D2D synchronization signals according to different application scenarios, thereby improving the coverage of the D2D synchronization signal and improving the success rate of establishing a synchronization between the remote terminal and other terminals.

In a possible implementation manner, the cooperation indication identifier is a first identifier or a second identifier, where the first identifier is used to indicate that the terminal that receives the cooperative broadcast message determines an end-to-end link reference Transmitting a D2D synchronization signal when the signal received power S-RSRP is less than the first threshold; the second identifier is used to indicate that the terminal that receives the cooperative broadcast message directly sends a D2D synchronization signal; or, the second identifier is used by The terminal indicating that the cooperative broadcast message is received transmits a D2D synchronization signal when determining that the S-RSRP is greater than or equal to a second threshold, wherein the second threshold is the same as or different from the first threshold. Therefore, with the method provided by the embodiment of the present invention, the newly added cooperation indication identifier can be compatible with the existing D2D signal transmission rule and can also set different rules according to actual needs to effectively improve the D2D synchronization signal coverage when multiple terminals transmit the D2D synchronization signal. range.

In a possible implementation manner, the cooperation indication identifier further indicates a sending condition that is required to be met when the terminal that receives the cooperative broadcast message sends a D2D system message, where the D2D system message refers to receiving the The system common information required for the terminal of the D2D synchronization signal.

In a possible implementation manner, the first terminal sends the cooperative broadcast message, where the first terminal sends the cooperative broadcast message on a preset physical channel, where the preset physical channel is used to carry the Cooperative broadcast message; the preset physical channel is a physical end-to-end link broadcast channel PSBCH.

In a fourth aspect, a D2D synchronization signal sending method includes: receiving, by a first terminal, a cooperative broadcast message, where the cooperative broadcast message carries a collaboration indication identifier, where the collaboration indication identifier indicates that the collaborative broadcast message is received The transmission condition that is required when the terminal transmits the D2D synchronization signal; when the first terminal determines that it satisfies the transmission condition indicated by the cooperation indication identifier, it transmits a D2D synchronization signal.

In a possible implementation manner, the cooperation indication identifier is a first identifier or a second identifier, where the first identifier is used to indicate that the terminal that receives the cooperative broadcast message determines that the S-RSRP is smaller than the first a threshold, the D2D synchronization signal is sent; the second identifier is used to indicate that the terminal that receives the cooperative broadcast message directly sends a D2D synchronization signal; or the second identifier is used to indicate that the collaboration is received The terminal of the broadcast message sends a D2D synchronization signal when determining that the S-RSRP is greater than or equal to the second threshold, wherein the second threshold is the same as or different from the first threshold; the first terminal determines that the self-meeting the collaboration indication identifier is satisfied And transmitting, when the indication condition is sent, the D2D synchronization signal, when the cooperation indication identifier is the first identifier, the first terminal sends a D2D synchronization signal when determining that the measured S-RSRP is less than the first threshold; When the cooperation indication identifier is the second identifier, the first terminal directly sends the D2D synchronization signal; or the first terminal sends the S-RSRP when the measured S-RSRP is greater than or equal to the second threshold. D2D synchronization signal. Therefore, with the method provided by the embodiment of the present invention, the newly added cooperation indication identifier can be compatible with the existing D2D signal transmission rule and can also set different rules according to actual needs to effectively improve the D2D synchronization signal coverage when multiple terminals transmit the D2D synchronization signal. range.

In a possible implementation manner, the cooperation indication identifier further indicates a sending condition that is required to be met when the terminal that receives the cooperative broadcast message sends a D2D system message, where the D2D system message refers to receiving the The system common information required for the terminal of the D2D synchronization signal. After the first terminal receives the cooperative broadcast message, the method further includes: when the first terminal determines that the sending condition that the cooperation indication identifier is satisfied, the D2D system message is sent.

In a possible implementation manner, the first terminal receives the cooperative broadcast message, where the first terminal receives a cooperative broadcast message on a preset physical channel, where the preset physical channel is used to carry the cooperative broadcast message; The preset physical channel is a PSBCH.

In a fifth aspect, a device-to-device D2D synchronization signal transmission device includes: a processing unit, configured to generate a collaboration indication message, where the cooperation indication message carries identifier information of a terminal that needs to cooperatively transmit a D2D synchronization signal, The indication information is used to indicate that at least two terminals corresponding to the identifier information cooperate to send a D2D synchronization signal, and the transceiver unit is configured to send the collaboration indication message generated by the processing unit.

In a possible implementation manner, the cooperation indication message further carries physical resource indication information, where the physical resource indication information is used to indicate that at least two terminals corresponding to the identification information use the same physical resource to jointly transmit a D2D synchronization signal. .

In a possible implementation, the identifier information is at least one collaboration group identifier, and each collaboration group identifier corresponds to one terminal set; before the collaboration indication message is generated, the processing unit is further configured to: At least one terminal is divided into at least one collaboration group, and each collaboration group is assigned a corresponding collaboration group identifier.

In a possible implementation, when the at least one terminal of the coverage area is divided into the at least one collaboration group, the processing unit is specifically configured to: according to the location information of the at least one terminal, or the Determining, by the at least one terminal, the battery capability information of the at least one terminal, or the neighbor information corresponding to the at least one terminal, or the D2D capability information of the at least one terminal, into the at least one collaboration group, where The neighbor information corresponding to each terminal is used to enable the base station to learn the identity of the terminal adjacent to the terminal.

In a possible implementation, the collaboration indication message further carries a collaboration configuration parameter, where the collaboration configuration parameter is used to filter at least two terminals corresponding to the identifier information; the collaboration configuration parameter is at least A measurement parameter corresponds to at least one of a threshold condition or at least one sector identifier.

In a sixth aspect, a D2D synchronization signal sending apparatus includes: a transceiver unit, configured to receive a cooperation indication message sent by a base station, where the cooperation indication message carries identifier information of a terminal that needs to cooperatively transmit a D2D synchronization signal, where the indication information is used by Transmitting, by the transceiver unit, a D2D synchronization signal by using at least two terminals corresponding to the identification information to jointly transmit a D2D synchronization signal, where the processing unit is configured to determine that one of the at least two terminals corresponding to the identification information is .

In a possible implementation manner, the cooperation indication message further carries physical resource indication information, where the physical resource indication information is used to indicate that at least two terminals corresponding to the identification information use the same physical resource to jointly transmit a D2D synchronization signal. When the D2D synchronization signal is sent by the transceiver unit, the transceiver unit is specifically configured to: send a D2D synchronization signal on a physical resource indicated by the physical resource indication information.

In a possible implementation manner, the identifier information is at least one collaboration group identifier, and each collaboration group identifier corresponds to one terminal set; and when it is determined that one of the at least two terminals corresponding to the identifier information is one, When the transceiver unit sends the D2D synchronization signal, the processing unit is specifically configured to: when determining that the collaboration group identifier corresponding to the collaboration group to which the association group belongs is one of the at least one collaboration group identifier, send the D2D synchronization signal by using the transceiver unit .

In a possible implementation manner, the collaboration indication message further carries a collaboration configuration parameter, where the collaboration configuration parameter is used to filter at least two terminals corresponding to the identifier information; the collaboration configuration parameter is at least one measurement At least one of the threshold condition corresponding to the parameter or the at least one sector identifier; when the D2D synchronization signal is sent by the transceiver unit, the processing unit is specifically configured to: respectively, the measurement result corresponding to the at least one measurement parameter When at least one of the measurement results satisfies a corresponding threshold condition, the D2D synchronization signal is transmitted by the transceiver unit; and/or when it is determined that the sector identifier corresponding to the sector to which the sector belongs is one of the at least one sector identifier, A D2D synchronization signal is transmitted through the transceiver unit.

According to a seventh aspect, a D2D synchronization signal sending apparatus includes: a processing unit, configured to generate a cooperative broadcast message, where the cooperative broadcast message carries a cooperation indication identifier, where the cooperation indication identifier indicates that the terminal that receives the cooperative broadcast message sends The transmission condition that is required to be satisfied when the D2D is synchronized; the transceiver unit is configured to send the cooperative broadcast message generated by the processing unit.

In a possible implementation manner, the cooperation indication identifier is a first identifier or a second identifier, where the first identifier is used to indicate that the terminal that receives the cooperative broadcast message determines an end-to-end link reference Transmitting a D2D synchronization signal when the signal received power S-RSRP is less than the first threshold; the second identifier is used to indicate that the terminal that receives the cooperative broadcast message directly sends a D2D synchronization signal; or, the second identifier is used by The terminal indicating that the cooperative broadcast message is received transmits a D2D synchronization signal when determining that the S-RSRP is greater than or equal to a second threshold, wherein the second threshold is the same as or different from the first threshold.

According to an eighth aspect, a D2D synchronization signal sending apparatus includes: a transceiver unit, configured to receive a cooperative broadcast message, where the cooperative broadcast message carries a cooperation indication identifier, where the cooperation indication identifier indicates that the terminal that receives the cooperative broadcast message sends The D2D synchronization signal is required to be satisfied by the transmission condition; and the processing unit is configured to send the D2D synchronization signal by the transceiver unit when determining that the transmission condition of the cooperation indication indicator is satisfied.

In a possible implementation manner, the cooperation indication identifier is a first identifier or a second identifier, where the first identifier is used to indicate that the terminal that receives the cooperative broadcast message determines that the S-RSRP is smaller than the first a threshold, the D2D synchronization signal is sent; the second identifier is used to indicate that the terminal that receives the cooperative broadcast message directly sends a D2D synchronization signal; or the second identifier is used to indicate that the collaboration is received The end of the broadcast message Transmitting, by the terminal, a D2D synchronization signal when determining that the S-RSRP is greater than or equal to the second threshold, where the second threshold is the same as or different from the first threshold; determining that the self-satisfying the transmission condition indicated by the collaboration indication identifier is passed The transceiver unit sends a D2D synchronization signal, where the processing unit is configured to: when the cooperation indication identifier is the first identifier, send the D2D synchronization by using the transceiver unit when determining that the measured S-RSRP is less than the first threshold. a signal; when the cooperation indication identifier is a second identifier, directly sending a D2D synchronization signal by using the transceiver unit; or sending a D2D synchronization signal by using the transceiver unit when determining that the measured S-RSRP is greater than or equal to a second threshold .

In a ninth aspect, a network device includes a transceiver, a processor, a bus, and a memory, the transceiver for communicating with a terminal, the processor being configured to support performing a corresponding function of the base station in the first aspect described above. The memory is coupled to the processor, which stores program instructions and data necessary for the base station in the first aspect described above.

In a tenth aspect, a terminal includes a transceiver, a processor, a bus, and a memory, the transceiver for communicating with a network device, the processor being configured to support execution of a corresponding function of the terminal in the second aspect above. The memory is coupled to the processor, which stores program instructions and data necessary for the terminal in the second aspect above.

In an eleventh aspect, a terminal includes a transceiver, a processor, a bus, and a memory, wherein the transceiver is configured to perform communication interaction with other terminals, and the processor is configured to support execution of the first terminal in the third aspect. The function. The memory is coupled to the processor, which stores program instructions and data necessary for the first terminal in the third aspect above.

A twelfth aspect, a terminal comprising a transceiver, a processor, a bus, and a memory, the transceiver being configured to perform communication interaction with other terminals, the processor being configured to support execution of the first terminal in the fourth aspect above The function. The memory is coupled to the processor, which stores program instructions and data necessary for the first terminal in the fourth aspect above.

A thirteenth aspect is a computer storage medium, which may be non-volatile, that is, the content is not lost after power off. A software program is stored in the storage medium, and the software program, when being read and executed by one or more processors, implements the method provided by the first aspect or any one of the foregoing first aspects, or the software program is The method provided by the second aspect or any one of the foregoing second aspects may be implemented when the one or more processors read and execute, or the software program may be implemented when read and executed by one or more processors The third aspect or the method provided by any one of the foregoing third aspects, or the software program can implement the fourth aspect or any one of the foregoing fourth aspects when read and executed by one or more processors The method provided by the way.

DRAWINGS

1 is a schematic diagram of a scenario supported by 3GPP LTE D2D in the background of the present invention;

2 is a schematic diagram of conditions required for a terminal to transmit a D2D synchronization signal when the terminal is located in an IC within the coverage of the eNodeB in the background art of the present invention;

3 is a schematic diagram of establishing synchronization between a terminal outside the coverage of the eNodeB and a terminal located within the coverage of the eNodeB in the background art of the present invention;

4 is a schematic diagram of a terminal cooperatively transmitting a D2D synchronization signal in a coverage area of an eNodeB according to an embodiment of the present invention;

FIG. 5 is a flowchart of an overview of a method for transmitting a D2D synchronization signal according to an embodiment of the present invention; FIG.

6 is a schematic diagram of a terminal cooperatively transmitting a D2D synchronization signal that satisfies an RSRP threshold condition when a cooperative configuration parameter is a measurement parameter RSRP according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of each cell corresponding to a SL receiving resource pool and an SL sending resource pool according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a cooperative transmission of a D2D synchronization signal by a terminal not covered by an eNodeB according to an embodiment of the present invention; FIG.

FIG. 9 is a second flowchart of an overview of a D2D synchronization signal sending method according to an embodiment of the present invention; FIG.

10 is a schematic diagram of establishing synchronization between a terminal covered by an eNodeB and a remote terminal according to an embodiment of the present invention;

11 is a schematic structural diagram of a D2D synchronization signal sending apparatus according to an embodiment of the present invention;

12 is a second schematic structural diagram of a D2D synchronization signal sending apparatus according to an embodiment of the present invention;

13 is a third schematic structural diagram of a D2D synchronization signal sending apparatus according to an embodiment of the present invention;

14 is a fourth schematic structural diagram of a D2D synchronization signal transmitting apparatus according to an embodiment of the present invention;

FIG. 15 is a schematic structural diagram of a network device according to an embodiment of the present invention;

FIG. 16 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

FIG. 17 is a second schematic structural diagram of a terminal according to an embodiment of the present invention;

FIG. 18 is a third schematic structural diagram of a terminal according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The terminal referred to in the embodiment of the present invention may also be referred to as a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal, and the like.

It should be noted that the application scenario mentioned in the embodiment of the present invention is mainly an LTE system. However, the D2D synchronization signal sending method provided by the embodiment of the present invention is not limited to the eNodeB and the terminal used in the LTE system, and can also be applied to other wireless communication systems, such as an AP in a WLAN (Wireless Local Area Networks) system. And a STA (Station), or a network access node (for example, 5G_NodeB) and a user equipment (for example, 5G_) in a higher-level next-generation wireless communication system (for example, 5G RAT fifth-generation radio access technology) terminal).

In the LTE system, the terminal can send two specially designed D2D synchronization signals, including the PSSS (Primary Sidelink Synchronization Signal) and the SSSS (Secondary Sidelink Synchronization Signal). ). It should be understood that the D2D synchronization signal mentioned in the embodiment of the present invention may be the PSSS and the SSSS in the LTE system, or may be other newly designed D2D synchronization signals, which is not limited by the present invention. In addition, the D2D system information mentioned in the embodiment of the present invention may be an End Information Block-Sidelink (MIB-SL) in the LTE system, or may be other newly designed D2D system information. The invention is also not limited thereto.

In this application, all terminals are D2D/ProSE capable terminals.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings and drawings.

Scenario 1: The terminal within the coverage of the eNodeB cooperates to transmit a D2D synchronization signal.

Referring to FIG. 4, terminal A, terminal B, and terminal C are located within the coverage of the eNodeB, so all three terminals can be synchronized with the eNodeB. The remote terminal X is located outside the coverage of the cell, and cannot correctly receive D2D synchronization information sent from a single terminal, such as the D2D synchronization signal sent by the terminal A or the terminal B or the terminal C.

For the above scenario, the embodiment of the present invention provides a method for transmitting a D2D synchronization signal. The following is an example of transmitting a D2D synchronization signal by using a cooperation indication message sent by a first terminal and a second terminal.

Referring to Figure 5, the method includes:

Step 500: The base station generates a cooperation indication message.

The cooperation indication message carries the identification information of the terminal that needs to cooperate to send the D2D synchronization signal, and the cooperation indication message is used to indicate that at least two terminals corresponding to the identification information cooperate to transmit the D2D synchronization signal.

Optionally, the cooperation indication message is further used to indicate that at least two terminals corresponding to the identifier information send the D2D system message, where the D2D system message refers to system public information that is required to be learned by the terminal that receives the D2D synchronization signal, for example, the message may include Resource pool configuration for D2D transmission.

Step 510: The base station sends a cooperation indication message.

Step 520: The first terminal receives the cooperation indication message sent by the base station, and sends a D2D synchronization signal when determining that it is one of the at least two terminals corresponding to the identification information.

And the second terminal receives the cooperation indication message sent by the base station, and sends a D2D synchronization signal when determining that it is one of the at least two terminals corresponding to the identification information.

Optionally, the first terminal sends the D2D system information when determining that one of the at least two terminals corresponding to the identification information is itself.

Optionally, the cooperation indication message further carries physical resource indication information, where the physical resource indication information is used to indicate that at least two terminals corresponding to the identification information cooperatively transmit the D2D synchronization signal by using the same physical resource;

Therefore, when the first terminal and the second terminal send the D2D synchronization signal, the D2D synchronization signal is sent on the physical resource indicated by the physical resource indication information, that is, the D2D synchronization signal is transmitted by using the same physical resource.

For the step 500, the collaboration indication message may be the underlying signaling, for example, a DCI format (Downlink Control Information Format).

Specifically, the identifier information of the terminal that needs to cooperate to send the D2D synchronization signal carried in the cooperation indication message includes but is not limited to the following two situations:

The first case:

The identification information is at least one collaboration group identifier, and each collaboration group identifier corresponds to one terminal group.

In the first case, before the base station generates the cooperation indication message, the base station needs to divide at least one terminal of its coverage into at least one collaboration group, and assign a corresponding collaboration group identifier to each collaboration group.

Optionally, when the base station divides the at least one terminal of the coverage area into the at least one cooperation group, the location information of the at least one terminal, or the battery capability information of the at least one terminal, or the neighbor information corresponding to the at least one terminal, or At least one of the D2D capability information of the at least one terminal divides the at least one terminal into at least one collaborative group. The neighbor information corresponding to each terminal is used to enable the base station to learn the identity of the terminal adjacent to the terminal. For example, the terminal will use the information of the neighboring sites obtained in the existing standard end-to-end link discovery (SL discovery) process as neighbor information.

For example, the base station uses several terminals that are adjacent to each other as a cooperative group according to the location information of at least one terminal. For example, the terminal A, the terminal B, and the terminal C in FIG. 4 are adjacent to each other, and can serve as a cooperative group.

Therefore, the base station can divide a plurality of terminals around the edge of its coverage into a plurality of cooperation groups.

In example 2, the base station uses several terminals whose positions are adjacent and the battery power exceeds 50% as a cooperative group according to the location information of one terminal and the battery capability information of at least one terminal.

Therefore, for the step 520, when the first terminal determines that the collaboration group identifier corresponding to the collaboration group to which the association belongs is one of the at least one collaboration group identifier, the D2D synchronization signal is sent.

In addition, at least one collaboration group identifier may be directly carried in the collaboration indication message or may be implicitly carried in the collaboration indication message. For example, each collaborative group identity scrambling CRC (Cyclic Redundancy Check) field is used to implicitly carry the collaborative group identity. The CRC is generated by the remaining signaling domains except the collaboration group identifier field.

The second case:

The identification information is a D2D public identity, and the D2D public identity corresponds to all D2D capable terminals in the coverage of the base station.

Therefore, for step 520, when the first terminal determines that it is one of the D2D capable terminals corresponding to the D2D public identity, the D2D synchronization signal is transmitted.

Similarly, the D2D public identifier may be directly carried in the collaboration indication message or may be implicitly carried in the collaboration indication message. For example, the D2D public identity scrambling CRC (Cyclic Redundancy Check) field is used to implicitly carry the D2D public identity, where the CRC is a cooperative indication message generated by the remaining signaling domains except the cooperative group identification domain. .

In addition, the collaboration indication message further carries the collaboration configuration parameter, and the collaboration configuration parameter is used to filter the at least two terminals corresponding to the identifier information, that is, the at least two terminals corresponding to the identifier information filtered by the foregoing two scenarios are based on Collaboration configuration parameters further filter it.

Specifically, the cooperation configuration parameter is at least one of a threshold condition corresponding to the at least one measurement parameter or at least one sector identifier. It should be noted that the cooperative configuration parameter may also be other signaling parameters that determine the range of the terminal, or various possible combinations of the above parameters. Therefore, the first terminal sends the D2D synchronization signal when at least one of the measurement results corresponding to the at least one measurement parameter respectively meets the corresponding threshold condition; and/or the first terminal determines the sector identifier corresponding to the sector to which the first terminal belongs. A D2D synchronization signal is transmitted when one of the at least one sector identification is present. In particular, the first terminal transmits the D2D synchronization signal when the measurement results corresponding to the at least one measurement parameter respectively satisfy the corresponding threshold conditions.

For example, the cooperative configuration parameter is a measurement parameter, and the measurement parameter is RSRP, and the threshold corresponding to the RSRP is the first threshold. When the RSRP detected by the at least two terminals corresponding to the collaboration information is smaller than the first threshold according to the collaboration indication message, the terminal Send a D2D sync signal. As shown in FIG. 6, the RSRP detected by the terminal A and the terminal C is smaller than the first threshold. Therefore, the terminal A and the terminal C cooperate to transmit the D2D synchronization signal, and the RSRP detected by the terminal B is greater than the first threshold, so the terminal B does not participate in the terminal. The cooperation of A and terminal C transmits a D2D synchronization signal. It should be noted that, in addition to the threshold determination based on the RSRP detected by the cooperation indication message, the threshold value may be determined according to the RSRP detected by other downlink messages sent by the base station.

For another example, the cooperative configuration parameter is a sector identifier. When the terminal detects that the sector to which it belongs and the sector identifier given by the cooperative configuration parameter are consistent, the terminal sends a D2D synchronization signal.

Further, the physical resource indicated by the physical resource indication information is a physical resource other than the preset end-to-end link SL transmission resource pool, or a physical resource in the preset SL transmission resource pool. The physical resources outside the preset SL transmission resource pool herein may be periodic or aperiodic physical resources. For example, cellular resources Part of the physical resources. Therefore, the first terminal transmits the D2D synchronization signal on the physical resource indicated by the physical resource indication information.

For example, as shown in FIG. 7, the preset SL transmission resource pool corresponding to cell 1 (cell1) is TxPool_1, TxPool_2, and TxPool_3, and the preset SL transmission resource pool corresponding to cell 2 (cell2) is TxPool_4, TxPool_5, and cell 3 (cell3). The corresponding preset SL transmission resource pool is TxPool_6 and TxPool_7. The base station may indicate that the terminal in the cell 1 (cell1) transmits the D2D synchronization signal by using the physical resource in at least one resource pool of TxPool_1, TxPool_2, and TxPool_3, or sends the periodic or non-periodic physical resource except TxPool_1, TxPool_2, and TxPool_3. D2D sync signal.

In addition, in FIG. 7, the preset SL receiving resource pool corresponding to the cell 1 (cell1) is RxPool_1, RxPool_2, RxPool_3, RxPool_4, RxPool_5, RxPool_6, and RxPool_7, wherein RxPool_1, RxPool_2, and RxPool_3 are respectively associated with TxPool_1, TxPool_2, and TxPool_3. Correspondingly, RxPool_4 and RxPool_5 correspond to TxPool_4 and TxPool_5, respectively, and RxPool_6 and RxPool_7 correspond to TxPool_6 and TxPool_7, respectively. Therefore, the terminal in the cell 1 (cell1) can receive the D2D synchronization signal on the physical resources of the RxPool_1, the RxPool_2, and the RxPool_3, and can also receive the D2D synchronization signal sent by the terminal in the cell 2 (cell 2) and the cell 3 (cell 3).

For the step 510, when the base station sends the cooperation indication message, the base station sends an indication message on the preset physical channel, where the preset physical channel is used to carry the indication message.

The preset physical channel is a Physical Downlink Control Channel (PDCCH) or a physical control channel (for example, 5G_PDCCH) of the next generation wireless communication system. Optionally, the cooperation indication message may also be carried in a SIG (Signaling) field or a Trigger trigger frame of the WLAN system.

Scenario 2: The terminal with non-cell coverage cooperatively transmits a D2D synchronization signal.

Referring to FIG. 8, terminal B is located within the coverage of the eNodeB, and terminal A, terminal C, and terminal D are located outside the coverage of the eNodeB. At this time, the terminal B and the eNodeB are kept in synchronization; the terminal A and the terminal B are kept in synchronization; the terminal C and the terminal D are kept in synchronization with the terminal A, that is, the above four stations are synchronized with the eNodeB. The remote terminal X is located outside the coverage of the eNodeB and cannot correctly receive the D2D synchronization signal transmitted from a single terminal, such as terminal A or terminal B or terminal C or terminal D.

For the above scenario, the embodiment of the present invention provides a D2D synchronization signal sending method, including:

Step 900: The first terminal generates a cooperative broadcast message.

The cooperative broadcast message carries a cooperation indication identifier, and the cooperation indication identifier indicates a transmission condition that is required to be satisfied when the terminal that receives the cooperative broadcast message transmits the D2D synchronization signal.

In addition, the cooperation indication identifier further indicates a transmission condition that is required to be satisfied when the terminal that receives the cooperative broadcast message transmits the D2D system message, and the D2D system message refers to system common information that is required to be learned by the terminal that receives the D2D synchronization signal.

Step 910: The first terminal sends a cooperative broadcast message.

Step 920: The second terminal receives the cooperative broadcast message, and when the second terminal determines that it meets the transmission condition indicated by the cooperation indication identifier, the D2D synchronization signal is sent.

Optionally, the cooperative broadcast message may further carry the physical resource indication information, so that the terminal that receives the cooperative broadcast message sends the D2D synchronization signal on the same physical resource, or the terminal that receives the cooperative broadcast message may be preset at the same time. A D2D synchronization signal is sent on the physical resource.

Optionally, after the first terminal receives the cooperative broadcast message, the first terminal determines that it satisfies the sending condition indicated by the collaboration indication identifier, and sends a D2D system message.

Therefore, the scenario 2 proposed by the embodiment of the present invention may also be an extension of the scenario 1. For example, as shown in FIG. 10, each terminal (terminal 1, terminal 2, and terminal 3) corresponding to the collaboration group 1 at the edge of the coverage of the base station is sent. After the D2D synchronization signal, the terminal A, the terminal B, and the terminal C outside the coverage of the base station are synchronized with each terminal in the cooperative group 1. At this time, the terminal A sends a cooperative broadcast message, so that the terminal A, the terminal B, and the terminal C cooperate. The D2D synchronization signal is sent, and finally the synchronization with the terminal X is established.

For step 900, the collaboration indication identifier may be the first identifier or the second identifier:

The first identifier is used to indicate that the terminal that receives the cooperative broadcast message sends the D2D synchronization signal when determining that the S-RSRP is less than the first threshold, that is, the terminal sends the D2D synchronization signal when determining that the transmission condition specified in the prior art is met.

For example, in FIG. 8, when the cooperation indication identifier carried in the cooperative broadcast message sent by the terminal A is the first identifier, the terminal C sends a D2D synchronization signal when determining that the S-RSRP detected according to the cooperative broadcast message is less than the first threshold. Similar to the situation shown in Figure 3.

The second identifier is used to indicate that the terminal that receives the cooperative broadcast message directly sends the D2D synchronization signal; or the second identifier is used to indicate that the terminal that receives the cooperative broadcast message sends the D2D synchronization signal when determining that the S-RSRP is greater than or equal to the second threshold, The second threshold is the same as or different from the first threshold.

For example, the terminal that sends the cooperative broadcast message is the terminal A, and the terminal that receives the cooperative broadcast message is the terminal C and the terminal D. If the cooperation indication identifier is the first identifier, the terminal C determines the detected S according to the cooperative broadcast message. - The D2D synchronization signal is transmitted when the RSRP is smaller than the first threshold. At this time, the terminal C is far away from the terminal A. Even if a plurality of terminals similar to the terminal C transmit the D2D synchronization signal, the remote terminal may not receive the D2D synchronization signal. Because the superposition strength of the D2D synchronization signal is insufficient, the coverage of the D2D synchronization signal is not large enough. If the collaboration indicator is the second identifier, the second identifier is used to indicate that the terminal that receives the cooperative broadcast message sends the D2D synchronization signal when determining that the S-RSRP is greater than or equal to the second threshold, and the S-RSRP detected by the terminal C is greater than or equal to the second. When the threshold value is used, the D2D synchronization signal is sent. At this time, the terminal C is close to the terminal A. If the terminal D also detects that the obtained S-RSRP is greater than or equal to the second threshold, the D2D synchronization signal is sent, and the distance between the terminal C and the terminal D is relatively close. At this time, a plurality of terminals similar to the terminal C transmit the D2D synchronization signal so that the superimposing strength of the D2D synchronization signal is sufficiently large, and the coverage of the D2D synchronization signal also increases. Meanwhile, since the physical resources for transmitting the D2D synchronization signal are generally periodic, it is possible that the terminal A also joins the terminal C and the terminal D in the next cycle. Therefore, the coverage of the D2D synchronization signal is further increased, effectively improving the The success rate of synchronization established by the remote terminal.

Specifically, the cooperation indication signaling may be a new one-bit indication signaling, where the first identifier is “0” and the second identifier is “1”, where “0” indicates that the terminal that receives the cooperative broadcast message is determined. When the S-RSRP is smaller than the first threshold, the D2D synchronization signal is transmitted, and "1" indicates that the terminal that received the cooperative broadcast message directly transmits the D2D synchronization signal. As shown in FIG. 8, when the terminal C and the terminal D receive the cooperation indication flag carried in the cooperative broadcast message sent by the terminal A as "1", the terminal C, the terminal D, and the terminal A can cooperatively transmit the D2D synchronization signal.

The cooperative indication signaling may be a new 4 bits of indication signaling. For example, "0000" indicates that the terminal that received the cooperative broadcast message transmits the D2D synchronization signal when determining that the S-RSRP is less than the first threshold according to an existing standard. "1111" indicates that the terminal that received the cooperative broadcast message directly transmits the D2D synchronization signal. From "0001" to "1110", the terminal that has received the cooperative broadcast message transmits a D2D synchronization signal when it is determined that the S-RSRP is greater than the second threshold. Among them, "0001" to "1110" respectively correspond to one threshold, and each threshold is different. At this time, the terminal that receives the cooperative broadcast message determines whether it needs to transmit the D2D synchronization signal according to the received cooperation indication flag.

In addition, it should be understood that the cooperative indication signaling may also be indication signaling including other bits.

For the step 910: when the first terminal sends the cooperative broadcast message, the first terminal sends a cooperative broadcast message on the preset physical channel, where the preset physical channel is used to carry the cooperative broadcast message;

The preset physical channel is a physical end-to-end link broadcast channel (PSBCH) (Physical Sidelink Broadcast Channel). Alternatively, the physical end-to-end link broadcast channel (eg, 5G_PSBCH) of the next generation wireless communication system. Optionally, the foregoing cooperative broadcast message may also be carried in a SIG domain or a Trigger trigger frame of the WLAN system.

Based on the same inventive concept, an embodiment of the present invention further provides a device for transmitting a D2D synchronization signal, which may be a base station in the embodiment shown in FIG. 5, for performing the method embodiment corresponding to FIG. 5 above, and thus the present invention For an implementation of the apparatus for transmitting D2D synchronization signals provided by the embodiments, reference may be made to the implementation manner of the method, and the repeated description is omitted.

Referring to FIG. 11, a device for transmitting D2D synchronization signals includes:

The processing unit 1101 is configured to generate a collaboration indication message, where the collaboration indication message carries the identifier information of the terminal that needs to cooperate to send the D2D synchronization signal, where the indication information is used to indicate that at least two terminals corresponding to the identifier information cooperate to send the D2D synchronization. signal;

The transceiver unit 1102 is configured to send the collaboration indication message generated by the processing unit.

In a possible implementation manner, the identifier information is at least one collaboration group identifier, and each collaboration group identifier corresponds to one terminal group;

The processing unit 1101 is further configured to:

At least one terminal of its own coverage is divided into at least one collaboration group, and each collaboration group is assigned a corresponding collaboration group identifier.

In a possible implementation, when the at least one terminal of the coverage area is divided into the at least one collaboration group, the processing unit 1101 is specifically configured to:

The base station according to the location information of the at least one terminal, or the battery capability information of the at least one terminal, or the neighbor information corresponding to the at least one terminal, or the D2D capability information of the at least one terminal The information is used to divide the at least one terminal into at least one collaboration group, wherein the neighbor information corresponding to each terminal is used to enable the base station to learn the identity of the terminal adjacent to the terminal.

In a possible implementation manner, the collaboration indication message further carries a collaboration configuration parameter, where the collaboration configuration parameter is used to filter at least two terminals corresponding to the identifier information;

The cooperative configuration parameter is at least one of a threshold condition corresponding to at least one measurement parameter or at least one sector identifier.

Based on the same inventive concept, an embodiment of the present invention further provides a device for transmitting a D2D synchronization signal, which may be a terminal in the embodiment shown in FIG. 5, for performing the method embodiment corresponding to FIG. 5 above, and thus the present invention For an implementation of the apparatus for transmitting D2D synchronization signals provided by the embodiments, reference may be made to the implementation manner of the method, and the repeated description is omitted.

Referring to FIG. 12, a D2D synchronization signal sending apparatus includes:

The transceiver unit 1201 is configured to receive a collaboration indication message that is sent by the base station, where the collaboration indication message carries the identifier information of the terminal that needs to cooperate to send the D2D synchronization signal, where the indication information is used to indicate that at least two terminals corresponding to the identifier information cooperate. Sending a D2D synchronization signal;

The processing unit 1202 is configured to send, by the transceiver unit 1201, a D2D synchronization signal when it is determined to be one of the at least two terminals corresponding to the identifier information.

In a possible implementation manner, the cooperation indication message further carries physical resource indication information, where the physical resource indication information is used to indicate that at least two terminals corresponding to the identification information use the same physical resource to jointly transmit a D2D synchronization signal. ;

When the D2D synchronization signal is sent by the transceiver unit, the transceiver unit 1201 is specifically configured to:

Transmitting a D2D synchronization signal on the physical resource indicated by the physical resource indication information.

When it is determined that one of the at least two terminals corresponding to the identifier information is sent by the transceiver unit, the processing unit 1202 is specifically configured to:

When it is determined that the collaboration group identifier corresponding to the collaboration group to which the association belongs is one of the at least one collaboration group identifier, the D2D synchronization signal is sent by the transceiver unit 1201.

The cooperative configuration parameter is at least one of a threshold condition corresponding to at least one measurement parameter or at least one sector identifier;

When the D2D synchronization signal is sent by the transceiver unit 1201, the processing unit 1202 is specifically configured to:

Transmitting, by the transceiver unit 1201, a D2D synchronization signal when at least one of the measurement results corresponding to the at least one measurement parameter respectively meets a corresponding threshold condition; and/or

When it is determined that the sector identifier corresponding to the sector to which the sector belongs is one of the at least one sector identifier, the D2D synchronization signal is transmitted through the transceiver unit 1201.

Based on the same inventive concept, an embodiment of the present invention further provides a device for transmitting a D2D synchronization signal, which may be the first terminal in the embodiment shown in FIG. For the implementation of the device for transmitting the D2D synchronization signal provided by the embodiment of the present invention, refer to the implementation manner of the method, and details are not described herein again.

Referring to FIG. 13, a D2D synchronization signal sending apparatus includes:

The processing unit 1301 is configured to generate a cooperative broadcast message, where the cooperative broadcast identifier carries a cooperation indication identifier, where the cooperation indication identifier indicates a transmission condition that is required to be met when the terminal that receives the cooperative broadcast message sends a D2D synchronization signal;

The transceiver unit 1302 is configured to send the cooperative broadcast message generated by the processing unit.

In a possible implementation manner, the collaboration indication identifier is a first identifier or a second identifier;

The first identifier is used to indicate that the terminal that receives the cooperative broadcast message sends a D2D synchronization signal when determining that the end-to-end link reference signal received power S-RSRP is less than a first threshold;

The second identifier is used to indicate that the terminal that receives the cooperative broadcast message directly sends a D2D synchronization signal; or the second identifier is used to indicate that the terminal that receives the cooperative broadcast message is determining the S-RSRP The D2D synchronization signal is transmitted when the second threshold is greater than or equal to the second threshold, wherein the second threshold is the same as or different from the first threshold.

Based on the same inventive concept, an embodiment of the present invention further provides a device for transmitting a D2D synchronization signal, which may be a second terminal in the embodiment shown in FIG. For the implementation of the device for transmitting the D2D synchronization signal provided by the embodiment of the present invention, refer to the implementation manner of the method, and details are not described herein again.

Referring to FIG. 14, a D2D synchronization signal sending apparatus includes:

The transceiver unit 1401 is configured to receive a cooperative broadcast message, where the cooperative broadcast message carries a cooperation indication identifier, where the cooperation indication identifier indicates a transmission condition that is required to be met when the terminal that receives the cooperative broadcast message sends a D2D synchronization signal;

The processing unit 1402 is configured to send, by the transceiver unit 1401, a D2D synchronization signal when determining that the transmission condition of the cooperation indication identifier is satisfied.

The first identifier is used to indicate that the terminal that receives the cooperative broadcast message sends a D2D synchronization signal when determining that the S-RSRP is smaller than the first threshold;

The second identifier is used to indicate that the terminal that receives the cooperative broadcast message directly sends a D2D synchronization signal; or the second identifier is used to indicate that the terminal that receives the cooperative broadcast message determines S- Transmitting a D2D synchronization signal when the RSRP is greater than or equal to the second threshold, wherein the second threshold is the same as or different from the first threshold;

And determining, by the transmitting and receiving unit, a D2D synchronization signal, where the processing unit 1402 is specifically configured to:

When the cooperation indication identifier is the first identifier, the D2D synchronization signal is sent by the transceiver unit 1401 when it is determined that the measured S-RSRP is less than the first threshold;

When the cooperation indication identifier is the second identifier, the D2D synchronization signal is directly sent by the transceiver unit 1401; or the D2D synchronization signal is sent by the transceiver unit 1401 when it is determined that the measured S-RSRP is greater than or equal to the second threshold. .

Referring to FIG. 15, a network device includes a transceiver 1501, a processor 1502, a bus 1504, and a memory 1503. The transceiver 1501 is configured to perform communication interaction with a terminal, and the processor 1502 is configured to support performing the above. Figure 5 shows the corresponding functions of the base station. The memory 1503 is coupled to the processor 1502, which stores the program instructions and data necessary for the base station of FIG.

Referring to FIG. 16, a terminal includes a transceiver 1601, a processor 1602, a bus 1604, and a memory 1603. The transceiver 1601 is configured to perform communication interaction with a network device, and the processor 1602 is configured to support performing the above. Figure 5 shows the corresponding function of the terminal. The memory 1603 is coupled to the processor 1602, which stores the program instructions and data necessary for the terminal in FIG. 5 described above.

Referring to FIG. 17, a terminal includes a transceiver 1701, a processor 1702, a bus 1704, and a memory 1703. The transceiver 1701 is configured to perform communication interaction with other terminals, and the processor is configured to support execution of the above figure. The corresponding function of the first terminal in 9. The memory is coupled to the processor, which stores the program instructions and data necessary for the first terminal in FIG.

Referring to FIG. 18, a terminal includes a transceiver 1801, a processor 1802, a bus 1804, and a memory 1803. The transceiver is configured to perform communication interaction with other terminals, and the processor is configured to support execution. The corresponding functions of the second terminal in FIG. 9 are described. The memory is coupled to the processor, which stores the program instructions and data necessary for the second terminal of FIG.

In the embodiment of the present invention, for the terminal in the coverage of the network device (for example, the base station), the base station generates a collaboration indication message, where the indication message carries the identifier information of the terminal that needs to cooperatively send the D2D synchronization signal, where the indication information is used to indicate the The at least two terminals corresponding to the identification information jointly transmit a D2D synchronization signal, and the base station sends the indication message. The terminal that receives the cooperation indication message sent by the base station determines that it is one of the at least two terminals corresponding to the identification information, and sends a D2D synchronization signal. Therefore, the method provided by the embodiment of the present invention can implement coordinated transmission of D2D synchronization signals by multiple terminals in the coverage of the base station, achieve multiple overlapping of the same D2D synchronization signals, improve the coverage of the D2D synchronization signal, and improve the long-distance terminal and other The success rate of the terminal establishment synchronization. For a terminal that is not covered by the network device, the terminal generates a cooperative broadcast message, where the cooperative broadcast message carries a cooperation indication identifier, and the cooperation indication identifier indicates a transmission condition that is required when the terminal that receives the cooperative broadcast message sends the D2D synchronization signal, and the terminal sends the collaboration. Broadcast message. The terminal that receives the cooperative broadcast message transmits a D2D synchronization signal when it determines that it satisfies the transmission condition indicated by the cooperation indication flag. Therefore, the coverage of the D2D synchronization signal is improved, and the success rate of establishing the synchronization between the remote terminal and other terminals is improved.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

While the preferred embodiment of the invention has been described, it will be understood that Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and

It is apparent that those skilled in the art can make various modifications and variations to the embodiments of the invention without departing from the spirit and scope of the embodiments of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the embodiments of the invention.

Claims

A device-to-device D2D synchronization signal sending method, comprising:

The base station generates a cooperation indication message, where the cooperation indication message carries the identification information of the terminal that needs to cooperate to send the D2D synchronization signal, where the indication information is used to indicate that at least two terminals corresponding to the identification information cooperate to transmit the D2D synchronization signal;

The base station sends the cooperation indication message.
The method according to claim 1, wherein the cooperation indication message further carries physical resource indication information, where the physical resource indication information is used to indicate that at least two terminals corresponding to the identification information use the same physical resource cooperation. Send a D2D sync signal.
The method according to claim 1 or 2, wherein the identification information is at least one collaboration group identifier, and each collaboration group identifier corresponds to one terminal set;

Before the base station generates the cooperation indication message, the method further includes:

The base station divides at least one terminal of its own coverage into at least one collaboration group, and assigns a corresponding collaboration group identifier to each collaboration group.
The method according to claim 3, wherein the base station divides at least one terminal of its own coverage into at least one collaboration group, including:

The base station according to the location information of the at least one terminal, or the battery capability information of the at least one terminal, or the neighbor information corresponding to the at least one terminal, or the D2D capability information of the at least one terminal The information is used to divide the at least one terminal into at least one collaboration group, wherein the neighbor information corresponding to each terminal is used to enable the base station to learn the identity of the terminal adjacent to the terminal.
The method according to any one of claims 1 to 4, wherein the cooperation indication message further carries a collaboration configuration parameter, and the collaboration configuration parameter is used to filter at least two terminals corresponding to the identifier information;

The cooperative configuration parameter is at least one of a threshold condition corresponding to at least one measurement parameter or at least one sector identifier.
A D2D synchronization signal sending method, comprising:

The first terminal receives the cooperation indication message sent by the base station, where the cooperation indication message carries the identification information of the terminal that needs to cooperate to send the D2D synchronization signal, where the indication information is used to indicate that at least two terminals corresponding to the identification information cooperate to send the D2D synchronization. signal;

When the first terminal determines that it is one of the at least two terminals corresponding to the identifier information, the D2D synchronization signal is sent.
The method according to claim 6, wherein the cooperation indication message further carries physical resource indication information, where the physical resource indication information is used to indicate that at least two terminals corresponding to the identification information use the same physical resource cooperation. Sending a D2D synchronization signal;

The first terminal sends a D2D synchronization signal, including:

The first terminal sends a D2D synchronization signal on the physical resource indicated by the physical resource indication information.
The method according to claim 6 or 7, wherein the identification information is at least one collaboration group identifier, and each collaboration group identifier corresponds to one terminal set;

When the first terminal determines that it is one of the at least two terminals corresponding to the identifier information, the D2D synchronization signal is sent, including:

Determining, by the first terminal, a collaboration group identifier corresponding to the collaboration group to which the association belongs to the at least one collaboration group identifier One of the ones sends a D2D sync signal.
The method according to any one of claims 6 to 8, wherein the cooperation indication message further carries a cooperation configuration parameter, and the cooperation configuration parameter is used to filter at least two terminals corresponding to the identification information;

The cooperative configuration parameter is at least one of a threshold condition corresponding to at least one measurement parameter or at least one sector identifier;

The first terminal sends a D2D synchronization signal, including:

Transmitting, by the first terminal, a D2D synchronization signal when at least one of the measurement results corresponding to the at least one measurement parameter respectively meets a corresponding threshold condition; and/or

The first terminal sends a D2D synchronization signal when determining that the sector identifier corresponding to the sector to which it belongs is one of the at least one sector identifier.
A D2D synchronization signal sending method, comprising:

The first terminal generates a cooperative broadcast message, where the cooperative broadcast message carries a cooperation indication identifier, and the cooperation indication identifier indicates a transmission condition that is required to be satisfied when the terminal that receives the cooperative broadcast message sends the D2D synchronization signal;

The first terminal sends the collaborative broadcast message.
The method according to claim 10, wherein the collaboration indication identifier is a first identifier or a second identifier;

The first identifier is used to indicate that the terminal that receives the cooperative broadcast message sends a D2D synchronization signal when determining that the end-to-end link reference signal received power S-RSRP is less than a first threshold;

The second identifier is used to indicate that the terminal that receives the cooperative broadcast message directly sends a D2D synchronization signal; or the second identifier is used to indicate that the terminal that receives the cooperative broadcast message determines that the S-RSRP is greater than The D2D synchronization signal is transmitted when the second threshold is equal to, wherein the second threshold is the same as or different from the first threshold.
A D2D synchronization signal sending method, comprising:

Receiving, by the first terminal, a cooperative broadcast message, where the cooperative broadcast identifier carries a cooperation indication identifier, where the cooperation indication identifier indicates a transmission condition that is required to be met when the terminal that receives the cooperative broadcast message sends the D2D synchronization signal;

The first terminal determines that it satisfies the transmission condition indicated by the cooperation indication identifier, and sends a D2D synchronization signal.
The method according to claim 12, wherein the collaboration indication identifier is a first identifier or a second identifier;

The first identifier is used to indicate that the terminal that receives the cooperative broadcast message sends a D2D synchronization signal when determining that the S-RSRP is smaller than the first threshold;

The second identifier is used to indicate that the terminal that receives the cooperative broadcast message directly sends a D2D synchronization signal; or the second identifier is used to indicate that the terminal that receives the cooperative broadcast message determines S- Transmitting a D2D synchronization signal when the RSRP is greater than or equal to the second threshold, wherein the second threshold is the same as or different from the first threshold;

And sending, by the first terminal, the D2D synchronization signal, when the first terminal determines that the transmission condition is the indication of the collaboration indication identifier, including:

When the collaboration indication identifier is the first identifier, the first terminal determines that the measured S-RSRP is smaller than Sending a D2D synchronization signal at a first threshold;

When the cooperation indication identifier is the second identifier, the first terminal directly sends a D2D synchronization signal; or the first terminal sends a D2D synchronization signal when determining that the measured S-RSRP is greater than or equal to a second threshold.
A device-to-device D2D synchronization signal transmission device, comprising:

a processing unit, configured to generate a collaboration indication message, where the collaboration indication message carries identifier information of a terminal that needs to cooperatively send a D2D synchronization signal, where the indication information is used to indicate that at least two terminals corresponding to the identifier information cooperate to send a D2D synchronization signal ;

And a transceiver unit, configured to send the collaboration indication message generated by the processing unit.
The apparatus according to claim 14, wherein the cooperation indication message further carries physical resource indication information, where the physical resource indication information is used to indicate that at least two terminals corresponding to the identification information use the same physical resource cooperation. Send a D2D sync signal.
The device according to claim 14 or 15, wherein the identification information is at least one collaboration group identifier, and each collaboration group identifier corresponds to a terminal set;

Before generating the collaboration indication message, the processing unit is further configured to:

At least one terminal of its own coverage is divided into at least one collaboration group, and each collaboration group is assigned a corresponding collaboration group identifier.
The device according to claim 16, wherein when the at least one terminal of the coverage area is divided into the at least one collaboration group, the processing unit is specifically configured to:

The base station according to the location information of the at least one terminal, or the battery capability information of the at least one terminal, or the neighbor information corresponding to the at least one terminal, or the D2D capability information of the at least one terminal The information is used to divide the at least one terminal into at least one collaboration group, wherein the neighbor information corresponding to each terminal is used to enable the base station to learn the identity of the terminal adjacent to the terminal.
The device according to any one of claims 14-17, wherein the cooperation indication message further carries a cooperation configuration parameter, and the cooperation configuration parameter is used to filter at least two terminals corresponding to the identification information;

The cooperative configuration parameter is at least one of a threshold condition corresponding to at least one measurement parameter or at least one sector identifier.
A D2D synchronization signal sending device, comprising:

The transceiver unit is configured to receive a collaboration indication message sent by the base station, where the collaboration indication message carries the identifier information of the terminal that needs to cooperate to send the D2D synchronization signal, where the indication information is used to indicate that at least two terminals corresponding to the identifier information are cooperatively sent. D2D synchronization signal;

The processing unit is configured to send, by the transceiver unit, a D2D synchronization signal when determining that one of the at least two terminals corresponding to the identifier information is itself.
The device according to claim 19, wherein the cooperation indication message further carries physical resource indication information, where the physical resource indication information is used to indicate that at least two terminals corresponding to the identification information use the same physical resource cooperation. Sending a D2D synchronization signal;

When the D2D synchronization signal is sent by the transceiver unit, the transceiver unit is specifically configured to:

Transmitting a D2D synchronization signal on the physical resource indicated by the physical resource indication information.
The device according to claim 19 or 20, wherein the identification information is at least one collaboration group identifier, and each collaboration group identifier corresponds to one terminal set;

When it is determined that one of the at least two terminals corresponding to the identifier information is sent by the transceiver unit, the processing unit is specifically configured to:

When it is determined that the collaboration group identifier corresponding to the collaboration group to which the association belongs is one of the at least one collaboration group identifier, the D2D synchronization signal is sent by the transceiver unit.
The apparatus according to any one of claims 19 to 21, wherein the cooperation indication message further carries a collaboration configuration parameter, where the collaboration configuration parameter is used to filter at least two terminals corresponding to the identifier information;

The cooperative configuration parameter is at least one of a threshold condition corresponding to at least one measurement parameter or at least one sector identifier;

When the D2D synchronization signal is sent by the transceiver unit, the processing unit is specifically configured to:

And transmitting, by the transceiver unit, a D2D synchronization signal when at least one of the measurement results corresponding to the at least one measurement parameter respectively meets a corresponding threshold condition; and/or

When it is determined that the sector identifier corresponding to the sector to which it belongs is one of the at least one sector identifier, the D2D synchronization signal is transmitted through the transceiver unit.
A D2D synchronization signal sending device, comprising:

a processing unit, configured to generate a cooperative broadcast message, where the cooperative broadcast message carries a cooperation indication identifier, where the cooperation indication identifier indicates a transmission condition that is required to be met when the terminal that receives the cooperative broadcast message sends a D2D synchronization signal;

And a transceiver unit, configured to send the collaborative broadcast message generated by the processing unit.
The device according to claim 23, wherein the collaboration indication identifier is a first identifier or a second identifier;

The first identifier is used to indicate that the terminal that receives the cooperative broadcast message sends a D2D synchronization signal when determining that the end-to-end link reference signal received power S-RSRP is less than a first threshold;

The second identifier is used to indicate that the terminal that receives the cooperative broadcast message directly sends a D2D synchronization signal; or the second identifier is used to indicate that the terminal that receives the cooperative broadcast message determines that the S-RSRP is greater than The D2D synchronization signal is transmitted when the second threshold is equal to, wherein the second threshold is the same as or different from the first threshold.
A D2D synchronization signal sending device, comprising:

a transceiver unit, configured to receive a cooperative broadcast message, where the cooperative broadcast message carries a cooperation indication identifier, where the cooperation indication identifier indicates a transmission condition that is required when a terminal that receives the cooperative broadcast message sends a D2D synchronization signal;

And a processing unit, configured to send, by the transceiver unit, a D2D synchronization signal when determining that the transmission condition that is the indication of the collaboration indication identifier is met by itself.
The device according to claim 25, wherein the cooperation indication identifier is a first identifier or a second identifier;

The first identifier is used to indicate that the terminal that receives the cooperative broadcast message sends a D2D synchronization signal when determining that the S-RSRP is smaller than the first threshold;

The second identifier is used to indicate that the terminal that receives the cooperative broadcast message directly sends a D2D synchronization signal; or the second identifier is used to indicate that the terminal that receives the cooperative broadcast message determines S- Transmitting a D2D synchronization signal when the RSRP is greater than or equal to the second threshold, wherein the second threshold is the same as or different from the first threshold;

Determining, by the transceiver unit, that a D2D synchronization signal is sent by the transceiver unit, the processing unit is specifically configured to:

And when the coordinated indication identifier is the first identifier, sending, by the transceiver unit, a D2D synchronization signal when determining that the measured S-RSRP is less than a first threshold;

When the cooperation indication identifier is the second identifier, the D2D synchronization signal is directly sent by the transceiver unit; or the D2D synchronization signal is sent by the transceiver unit when it is determined that the measured S-RSRP is greater than or equal to the second threshold.