WO2016078601A1 - 一种设备间通信同步方法及装置 - Google Patents

一种设备间通信同步方法及装置 Download PDF

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WO2016078601A1
WO2016078601A1 PCT/CN2015/094988 CN2015094988W WO2016078601A1 WO 2016078601 A1 WO2016078601 A1 WO 2016078601A1 CN 2015094988 W CN2015094988 W CN 2015094988W WO 2016078601 A1 WO2016078601 A1 WO 2016078601A1
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synchronization
user
synchronization signal
coverage
received
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French (fr)
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吴骅圃
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吴骅圃
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Definitions

  • the present application relates to the field of wireless communication technologies, and in particular, to an apparatus and device for synchronizing communication between devices.
  • D2D communication Device-to-Device (D2D) communication is a new technology that allows direct communication between terminal devices through configured wireless resources. With its huge potential value in the field of public security and general civil communication, it has gained industry. Wide attention. Develop Evolved Universal Terrestrial Radio Acccess (E- UTRA) Long Term Evolution corresponding protocol in the third Generation Partnership Project (3 rd Generation Partnership Project, 3GPP ) (Long Term Evolution, referred to as LTE) system evolved version of Release-12 In the work project, the LTE system allows to support D2D communication based on the system to meet the needs of the growing public security service and the terminal-to-terminal communication data service.
  • E- UTRA Evolved Universal Terrestrial Radio Acccess
  • the D2D user performs frequency and time synchronization based on the D2D synchronization signal. Similar to the physical layer ID (PCI), the D2D user sends a synchronization signal to configure a physical layer D2D Synchronization Source Identity (PSSID) for generating a D2D broadcast channel (PSBCH). Scrambling code. Therefore, in addition to the synchronization of time and frequency, the D2D user also obtains the PSSID based on the synchronization signal.
  • the D2D synchronization signal is divided into a primary D2D synchronization signal (PD2DSS) and a secondary synchronization signal (SD2DSS).
  • PD2DSS primary D2D synchronization signal
  • SD2DSS secondary synchronization signal
  • the D2D primary synchronization signal is the same as the LTE primary synchronization signal (PSS).
  • the sequence generation mode that is, the length of 62, is symmetrically mapped to the Zadoff-Chu sequence on the 62 subcarriers in the center of the bandwidth, but uses a different root sequence index to reduce the false detection of the D2D synchronization signal into a cell.
  • the probability of synchronizing the signal Different root sequence indices correspond to different Zadoff-chu root sequences, which have different periodic autocorrelation and cross-correlation.
  • the secondary synchronization signal of D2D adopts the same sequence as the LTE secondary synchronization signal (SSS).
  • the D2D synchronization signal may be classified into a cell timing based synchronization signal (D2DSSue-net) and a non cell timing based synchronization signal (D2DSS-oon) according to the type of reference timing transmitted by the synchronization signal.
  • D2DSSue-net cell timing based synchronization signal
  • D2DSS-oon non cell timing based synchronization signal
  • the synchronization signal from the D2D user within the network coverage has a higher priority than the synchronization signal from the D2D user outside the network coverage, that is, the D2D user should
  • the synchronization signals from D2D users within the network coverage are preferentially selected for synchronization.
  • the primary synchronization signal and the secondary synchronization signal are both single carrier frequency division multiple access (SC-FDMA) without discrete Fourier transform (DFT).
  • SC-FDMA single carrier frequency division multiple access
  • DFT discrete Fourier transform
  • the D2D synchronization signal occupies six frequency-domain subcarrier resources in the center of the system bandwidth, and the main synchronization signal and two time periods each having two time domain symbol lengths in each synchronization subframe in the time domain A secondary sync signal of the length of the domain symbol. Also in the sync subframe
  • the D2D synchronization channel (PD2DSCH) is configured to carry the necessary D2D communication establishment configuration information, such as the D2D subframe number, the TDD uplink and downlink configuration information, and the like.
  • the LTE-based D2D communication uses the LTE design as much as possible, its communication mode is very different from the traditional base station and terminal communication, so different signal/channel design and communication methods are needed.
  • a very important part is to establish communication link synchronization.
  • How to establish an efficient D2D synchronization mechanism on LTE system is an urgent problem to be solved in D2D communication.
  • how to carry the synchronization source type information through the synchronization signal has reduced the implementation complexity in the synchronization process, which is also a problem to be solved.
  • the present application provides a method and apparatus for communication between devices to improve D2D synchronization performance and reduce the complexity of D2D user synchronization detection.
  • a method for communication between devices provided by the present application includes:
  • the D2D user selects a physical layer D2D link synchronization source identifier according to a pre-defined correspondence between a reference timing type of the user-sent signal and a physical layer D2D link synchronization source identifier;
  • the D2D user generates a corresponding synchronization signal according to the selected D2D link synchronization source identifier
  • the D2D user detects whether it is within the coverage of the cell. If it is not within the coverage of the cell, the D2D user also detects whether the synchronization signal and the synchronization channel of other D2D users are received; the D2D user sends the synchronization signal and the synchronization channel according to the detection condition. Where the D2D user indicates in the physical D2D synchronization channel (PD2DSCH) whether the user is within the cell coverage.
  • PD2DSCH physical D2D synchronization channel
  • the reference timing type includes cell timing and non-cell timing
  • the synchronization signal and the synchronization channel are sent in a preset time-frequency resource of the synchronization signal belonging to the coverage according to the timing of the cell.
  • the D2D user is configured according to The downlink signal of the received cell is used as the timing for transmitting the synchronization signal.
  • the synchronization source reference timing type according to the received synchronization signal and the received synchronization channel.
  • the coverage indication is used to determine the transmission of the synchronization signal and the synchronization channel; preferably, the D2D user obtains the physical layer D2D link synchronization source identifier by decoding the received synchronization signal sent by other D2D users, according to a predefined physical Corresponding relationship between the layer D2D link synchronization source identifier and the synchronization source reference timing type, and obtaining the synchronization source type of the received synchronization signal.
  • the D2D user sends the user itself within a preset resource outside the coverage. Synchronization signal and synchronization channel.
  • the D2D user outside the coverage of the cell, if the synchronization source type of the synchronization signal of the other D2D users received is a non-cell timing based synchronization signal, the D2D user according to the received synchronization signal
  • the synchronization channel of the received synchronization signal and itself is periodically forwarded in other preset time-frequency resources belonging to the out-of-coverage synchronization signal.
  • the D2D user outside the coverage of the cell, if the synchronization source type of the synchronization signal of the other D2D users received is a cell timing-based synchronization signal, and the received synchronization channel indicates that the received user is in the cell.
  • the D2D user forwards the synchronization channel of the received synchronization signal and the D2D user's own synchronization channel within the time-frequency resources outside the other preset coverage according to the timing of the received synchronization signal.
  • the D2D user outside the coverage of the cell, if the synchronization source type of the synchronization signal of the other D2D users received is a cell timing-based synchronization signal, and the received synchronization channel indicates that the received user is in the Outside the coverage of the cell, the D2D user forwards the synchronization channel of the received synchronization signal and the D2D user's own synchronization channel in the resources outside the other preset coverage according to the timing of the received synchronization signal; or the D2D The user forwards the synchronization signal of the user's own synchronization signal and the synchronization channel within the resources of other preset coverages according to the timing of the received synchronization signal.
  • the D2D user determines a Zadoff-Chu sequence according to the selected D2D link synchronization source identifier and generates a primary synchronization signal and a secondary synchronization signal, and maps the primary synchronization signal and the secondary synchronization signal to the synchronization subframe.
  • the synchronization subframe is transmitted according to the reference timing.
  • the root sequence index of the primary synchronization signal may be a preset root sequence index or a root sequence index of the network configuration
  • the scrambling code of the sequence of the secondary synchronization signal may be a physical layer D2D link synchronization source identifier.
  • An apparatus provided by the present application includes: an initialization module, a detection decision module, and a transmission confirmation module, wherein:
  • An initialization module configured to select a physical layer D2D link synchronization source identifier and generate a synchronization sequence according to a correspondence between a reference timing type of the pre-defined local user transmission signal and a physical layer D2D link synchronization source identifier;
  • the detection decision module is configured to determine several parameters for controlling the transmission selection module: the coverage of the cell, the synchronization signal of the other D2D users, and the detection of the synchronization channel;
  • a sending confirmation module configured to determine a synchronization signal and a transmission mode of the synchronization channel, and send the synchronization signal and the synchronization channel.
  • the present invention provides an efficient and reliable D2D synchronization method.
  • FIG. 1 is a schematic diagram of a method for synchronizing communication between devices using the present invention
  • FIG. 2 is a schematic flow chart of a synchronization method according to a first embodiment of the present invention
  • FIG. 3 is a schematic flowchart of a synchronization method according to a second embodiment of the present invention.
  • FIG. 4 is a schematic flow chart of a synchronization method according to a third embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a preferred apparatus of the present application.
  • the invention provides an inter-device communication (D2D) synchronization method, the method comprising:
  • the D2D user selects a physical layer D2D link synchronization source identifier according to a preset correspondence between a type of a reference timing of a transmission signal of the UE and a physical layer D2D link synchronization source identifier.
  • the D2D user generates a sequence of synchronization signals with the selected physical layer D2D link synchronization source identifier and generates a synchronization signal.
  • the D2D user indicates whether the user is in the cell coverage in the physical D2D synchronization channel (PD2DSCH).
  • PD2DSCH physical D2D synchronization channel
  • the D2D user in the cell coverage sends the generated synchronization signal and the synchronization channel in a preset time-frequency resource of the synchronization signal that belongs to the coverage according to the timing of the cell.
  • the D2D user For the D2D user outside the coverage of the cell, receiving the synchronization signal and the synchronization channel of the other D2D user, if the synchronization source type of the received synchronization signal is a non-cell timing based synchronization signal, the D2D user receives the The timing of the synchronization signal forwards the synchronization channel of the received synchronization signal and the synchronization channel in step 103 within other predetermined time-frequency resources belonging to the out-of-coverage synchronization signal.
  • 106 For D2D users that are outside the coverage of the cell, receive synchronization signals and synchronization channels of other D2D users, if the synchronization source type of the received synchronization signal is a cell timing-based synchronization signal and the transmission user of the synchronization channel is in synchronization If the channel indicates that the user is in the cell coverage, the D2D user forwards the received synchronization signal to itself in the time-frequency resource outside the other preset coverage according to the timing of the received synchronization signal (step 103) Synchronization channel.
  • 107 For D2D users that are outside the coverage of the cell, receive synchronization signals and synchronization channels of other D2D users, if the synchronization source type of the received synchronization signal is a cell timing-based synchronization signal and the synchronization source user is in the synchronization channel.
  • the D2D user forwards the synchronization signal in the step 103 and the synchronization channel in the step 103 in the resources outside the other preset coverage according to the timing of the received synchronization signal; or For a D2D user outside the coverage of the cell, receiving a synchronization signal and a synchronization channel of other D2D users, if the synchronization source type of the received synchronization signal is a cell timing based synchronization signal and the synchronization source user indicates the synchronization channel If the synchronization source is outside the cell coverage, the D2D user transmits the synchronization signal in step 102 and the synchronization channel in step 103 in the resources outside the other preset coverage according to the timing of the received synchronization signal.
  • the D2D user For the D2D user outside the coverage of the cell, if no synchronization signal of any reference timing is detected, the D2D user sends the synchronization signal in step 102 and the synchronization in step 103 in the resource outside the preset coverage. channel.
  • step 101 the D2D user selects a physical layer D2D link synchronization source identifier according to the type of the self-transmitted signal reference timing.
  • the physical layer D2D link synchronization source identifier is classified into two types according to different types of reference timings, such as defining a correspondence between a physical layer synchronization source identifier and a reference timing type:
  • Reference timing type Physical layer D2D link synchronization source identifier Reference timing is cell timing (D2Due_net) (0..167) Reference timing is non-cell timing (D2Due_oon) (168..335)
  • the D2D user In step 102, the D2D user generates a synchronization signal based on the selected physical layer D2D link synchronization source identification.
  • Primary sync signal The synchronization subframe is transmitted according to the reference timing on the time-frequency resource mapped to the synchronization subframe with the secondary synchronization signal.
  • the root sequence index of the primary synchronization signal may be a preset root sequence index or a root sequence index of the network configuration, and the scrambling code of the sequence of the secondary synchronization signal may be a physical layer D2D link synchronization source identifier.
  • the D2D user indicates in the synchronization channel according to whether the user is in the cell coverage, for example, the setting bit is 1 to indicate that the UE is in the coverage, and the setting bit is 0 to indicate that the UE is out of the coverage.
  • set the synchronization channel according to the information of the user, such as the subframe number and the uplink and downlink configuration where the synchronization channel is located.
  • step 104 if the D2D user is in the cell coverage, the user transmits the synchronization signal in step 102 and the synchronization channel in step 103 according to the downlink signal of the received cell as the timing of transmitting the synchronization signal.
  • step 105 if the D2D user is outside the cell coverage, the received synchronization signal sent by the other D2D user obtains the physical layer D2D link synchronization source identifier by decoding the synchronization signal, according to the physical layer D2D shown in step 1. Corresponding relationship between the link synchronization source identifier and the synchronization source type, obtaining the synchronization source type of the received synchronization signal. If the synchronization source type of the received synchronization signal is a non-cell timing based synchronization signal, the D2D user receives the The timing of the synchronization signal forwards the received synchronization signal and its own synchronization channel within resources of other preset coverage areas.
  • step 106 if the D2D user is outside the cell coverage, the received synchronization signal sent by the other D2D user obtains the physical layer D2D link synchronization source identifier by decoding the synchronization signal, according to the physical layer D2D shown in step 1.
  • obtaining a synchronization source type of the received synchronization signal if the synchronization source type of the received synchronization signal is a cell timing-based synchronization signal and indicating the received synchronization channel If the user is in the coverage of the cell, the D2D user forwards the synchronization signal of the received synchronization signal and its own synchronization channel in the resources outside the other preset coverage according to the timing of the received synchronization signal.
  • step 107 for the D2D user outside the coverage of the cell, if the D2D user is outside the cell coverage, the received synchronization signal sent by the other D2D user obtains the physical layer D2D link synchronization source identifier by decoding the synchronization signal. Obtaining a synchronization source type of the received synchronization signal according to the correspondence between the physical layer D2D link synchronization source identifier and the synchronization source type shown in step 1.
  • the D2D user sends its own or forwards in the resources outside the preset coverage according to the timing of the received synchronization signal, and the synchronization source user indicates that the synchronization source is out of the cell coverage.
  • the signal and its own synchronization channel are cell timing based synchronization and the D2D user sends its own or forwards in the resources outside the preset coverage according to the timing of the received synchronization signal, and the synchronization source user indicates that the synchronization source is out of the cell coverage.
  • the signal and its own synchronization channel is
  • step 108 if no synchronization signal of any reference timing is detected for the D2D user outside the coverage of the cell, the D2D user transmits the synchronization signal in step 102 in the resource outside the preset coverage.
  • the synchronization channel in .
  • other D2D users detect the transmitted synchronization signal and the synchronization channel in the corresponding resources, perform time and frequency synchronization, and perform communication between devices.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • Step 201 Taking the D2D user in the coverage of the cell as an example, if the reference timing of transmitting the synchronization signal is based on the cell timing, the type of the synchronization source signal of the user is D2Due_net, according to the correspondence between the synchronization source type and the synchronization source identifier. relationship,
  • Reference timing type Physical layer D2D link synchronization source identifier Reference timing is cell timing (D2Due_net) (0..167) Reference timing is non-cell timing (D2Due_oon) (168..335)
  • Step 202 The user uses the synchronization source identifier as the scrambling code of the synchronization signal sequence, generates a synchronization sequence according to the standard, and thereby generates a synchronization signal.
  • Step 203 The user sets whether the indication in the coverage area in the synchronization channel is within the coverage, and configures the synchronization channel according to other information of the user, such as the subframe number and the uplink and downlink configuration where the synchronization channel is located.
  • Step 204 The user sends the synchronization signal and the synchronization channel generated in step 202 and step 203 in the uplink carrier or the uplink time slot according to the received timing of the downlink reference symbol of the coverage cell.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • Step 301 Taking a D2D user outside the coverage of the cell as an example, the user receives a synchronization signal and a synchronization channel sent by other D2D users, and determines a frequency deviation of the receiving channel by performing a correlation operation between the local sequence and the received sequence. Timing deviation, and obtain the physical layer D2D link synchronization source identifier, such as 168. According to the correspondence between the synchronization source type and the synchronization source identifier,
  • Reference timing type Physical layer D2D link synchronization source identifier Reference timing is cell timing (D2Due_net) (0..167) Reference timing is non-cell timing (D2Due_oon) (168..335)
  • Step 302 The user sends the received physical layer D2D link synchronization source identifier, such as 168, as a scrambling code to generate the same synchronization signal as the received synchronization signal.
  • the received physical layer D2D link synchronization source identifier such as 168
  • Step 303 The user sets whether the indication in the coverage area in the synchronization channel is out of the coverage, and configures the synchronization channel according to other information of the user, such as the subframe number and the uplink and downlink configuration where the synchronization channel is located.
  • Step 304 The user sends the synchronization signal in step 302 and the synchronization channel in step 303 in other time-frequency resources of the synchronization signal that are out of the coverage, that is, in a resource different from the received synchronization signal. .
  • Step 401 Taking a D2D user outside the coverage of the cell as an example, the user receives a synchronization signal and a synchronization channel sent by other D2D users, and determines a frequency deviation of the received signal by performing a correlation operation between the local sequence and the received sequence. Timing deviation, and Obtain the physical layer D2D link synchronization source identifier, such as 0. According to the correspondence between the synchronization source type and the synchronization source identifier,
  • Reference timing type Physical layer D2D link synchronization source identifier Reference timing is cell timing (D2Due_net) (0..167) Reference timing is non-cell timing (D2Due_oon) (168..335)
  • Step 402 The user obtains the received synchronization signal from the user in the coverage of the cell by decoding the synchronization channel, and then the user receives the received physical layer D2D link synchronization source identifier, such as 0, as a scrambling code, generating and receiving.
  • the synchronization signal to the same sync signal.
  • Step 403 The user sets whether the indication in the coverage area in the synchronization channel is out of the coverage, and configures the synchronization channel according to other information of the user, such as the subframe number and the uplink and downlink configuration in which the synchronization channel is located.
  • Step 404 The user transmits the synchronization signal in step 402 and the synchronization channel in step 403 in a predetermined time-frequency resource belonging to the synchronization signal outside the coverage.

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Abstract

本申请公开了一种设备间通信的同步方法及装置，该方法包括：D2D用户根据预定义的本用户发送信号的参考定时类型与物理层D2D链路同步源标识的对应关系选择物理层D2D链路同步源标识；D2D用户根据所述选择的D2D链路同步源标识产生相应的同步信号；D2D用户检测自己是否处于小区覆盖范围内，如果不处于小区覆盖范围内，D2D用户还检测是否接收到其它D2D用户的同步信号和同步信道；D2D用户根据所述检测情况来发送同步信号和同步信道；其中D2D用户在物理D2D同步信道中指示本用户是否处于小区覆盖范围内。应用本申请能够在蜂窝系统上简单实现设备间通信的同步，减少复杂度同时保证同步的有效性。

Description

一种设备间通信同步方法及装置 技术领域
本申请涉及无线通信技术领域，尤其涉及一种设备间通信同步方法和装置。
背景技术
设备间(Device-to-Device，D2D)通信作为允许终端设备之间通过配置的无线资源直接进行通信的新技术，凭借其在公共安全领域和普通民用通信领域中的巨大潜在价值，获得了业界的广泛关注。在第三代移动通信伙伴项目(3rd Generation Partnership Project,3GPP)制定Evolved Universal Terrestrial Radio Acccess(E-UTRA)协议对应的长期演进(Long Term Evolution,简称为LTE)系统的演进版本Release-12的工作项目中，LTE系统就允许支持基于该系统的D2D通信来满足日益增长的公共安全业务的需求以及终端对终端的通信数据服务。
在基于LTE系统的D2D通信中，与LTE系统的小区同步过程类似，D2D用户基于D2D的同步信号进行频率和时间同步。与物理层小区标识(Physical cell ID，PCI)类似，D2D用户发送同步信号都会配置一个物理层D2D链路同步源标识(Physical Sidelink Synchronization Source Identity，PSSID)，用于产生D2D广播信道(PSBCH)的扰码。因此，除了时间和频率的同步外，D2D用户还基于同步信号获得PSSID。D2D的同步信号分为主同步信号(primary D2D synchronization signal,PD2DSS)和辅同步信号(secondary D2D synchronization signal,SD2DSS)，D2D的主同步信号采用与LTE主同步信号(primary synchronization signal,PSS)同样的序列生成方式，即长度为62的，对称的映射到带宽中心的62个子载波上的Zadoff-Chu序列，但是采用不同的根序列索引(root sequence index)，以降低将D2D同步信号误检为小区同步信号的概率。不同的根序列索引对应产生不同的Zadoff-chu根序列，这些根序列具有不同的周期自相关性和互相关性。D2D的辅同步信号采用与LTE辅同步信号(Secondary synchronization signal,SSS)一样的序列。此外，D2D的同步信号根据同步信号发送的参考定时的类型可以分为基于小区定时的同步信号(D2DSSue-net)和非基于小区定时的同步信号(D2DSS-oon)。
对于进行基于D2D同步信号进行同步的D2D用户来说，来自于网络覆盖范围内的D2D用户的同步信号相对于来自网络覆盖范围外的D2D用户的同步信号有更高的优先级，即D2D用户应该优先选择来自网络覆盖范围内的D2D用户发出的同步信号进行同步。
在波形上，主同步信号和辅同步信号均采用不经离散傅里叶变换(DFT)的单载波频分多址(SC-FDMA)。
在时频资源的映射上，D2D同步信号占用系统带宽中心的6个频域子载波资源，时域上在每个同步子帧内各含有2个时域符号长度的主同步信号和2个时域符号长度的辅同步信号。在同步子帧中还 包含D2D同步信道(Physical D2D synchronization channel,PD2DSCH)，用于承载必要的D2D通信建立配置信息，如D2D子帧编号，TDD上下行配置信息等。
综上，虽然基于LTE的D2D通信尽量沿用LTE的设计，然而其通信模式跟传统的基站和终端间通信非常不同，所以需要不同的信号/信道设计和通信方法。在D2D通信建立的中，非常重要的一个环节就是建立通信链路同步。如何在LTE系统上建立一个高效的D2D同步机制是D2D通信当前急需解决的问题。在D2D同步机制中，如何通过同步信号携带同步源类型的信息已减少同步过程中的实现复杂度也是一个需要解决的问题。
发明内容
本申请提供了一种设备间通信的方法及装置，以提高D2D同步性能和降低D2D用户同步检测的复杂度。
本申请提供的一种设备间通信的方法包括：
D2D用户根据预定义的本用户发送信号的参考定时类型与物理层D2D链路同步源标识的对应关系选择物理层D2D链路同步源标识；
D2D用户根据所述选择的D2D链路同步源标识产生相应的同步信号；
D2D用户检测自己是否处于小区覆盖范围内，如果不处于小区覆盖范围内，D2D用户还检测是否接收到其它D2D用户的同步信号和同步信道；D2D用户根据所述检测情况来发送同步信号和同步信道；其中D2D用户在物理D2D同步信道中(PD2DSCH)中指示本用户是否处于小区覆盖范围内。
较佳地，所述参考定时类型包括小区定时和非小区定时；
较佳地，如果所述D2D用户处于小区覆盖内，根据小区的定时在预设的属于覆盖范围内的同步信号的时频资源内发送同步信号和同步信道，较佳地，所述D2D用户根据接收到的小区的下行信号作为发送同步信号的定时。
较佳地，如果所述D2D用户处于小区覆盖范围外，并接收到其他D2D用户的同步信号和同步信道，根据所述接收到的同步信号的同步源参考定时类型和所述接收到的同步信道中的覆盖指示来确定同步信号和同步信道的发送；较佳地，所述D2D用户通过解码接收到的其他D2D用户发送的同步信号，获得物理层D2D链路同步源标识，根据预定义的物理层D2D链路同步源标识与同步源参考定时类型的对应关系，获得接收到的同步信号的同步源类型。
较佳地，如果所述D2D用户处于小区覆盖范围外，并没有检测到任何其他D2D用户的同步信号和同步信道，则所述D2D用户在预设的覆盖范围外的资源内发送所述用户自身的同步信号的和同步信道。
较佳地，所述处于小区覆盖范围外的D2D用户，如果接收到的其它D2D用户的同步信号的同步源类型为非基于小区定时的同步信号，则所述D2D用户根据接收到的同步信号的定时在其他预设的属于覆盖范围外同步信号的的时频资源内转发接收到的同步信号的和自身的同步信道。
较佳地，所述处于小区覆盖范围外的D2D用户，如果接收到的其它D2D用户的同步信号的同步源类型为基于小区定时的同步信号并且接收到的同步信道中指示接收到的用户处于小区覆盖范围内，则所述D2D用户根据接收到的同步信号的定时在其他预设的覆盖范围外的时频资源内转发接收到的同步信号的和所述D2D用户自身的同步信道。
较佳地，所述处于小区覆盖范围外的D2D用户，如果接收到的其它D2D用户的同步信号的同步源类型为基于小区定时的同步信号并且接收到的同步信道中指示接收到的该用户处于小区覆盖范围外，则所述D2D用户根据接收到的同步信号的定时在其他预设的覆盖范围外的资源内转发接收到的同步信号的和所述D2D用户自身的同步信道；或者所述D2D用户根据接收到的同步信号的定时在其他预设的覆盖范围外的资源内转发所述用户自身的同步信号的和同步信道。
较佳地，所述D2D用户根据所述选择的D2D链路同步源标识确定Zadoff-Chu序列并生成主同步信号和辅同步信号，并将主同步信号与辅助同步信号映射到同步子帧的时频资源上，根据参考定时发送同步子帧。其中，主同步信号的根序列索引可以为预先设置的根序列索引或网络配置的根序列索引，辅同步信号的序列的扰码可以为物理层D2D链路同步源标识。
本申请提供的一种装置包括：初始化模块，检测判决模块、发送确认模块，其中：
初始化模块，用于根据预定义的本用户发送信号的参考定时类型与物理层D2D链路同步源标识的对应关系选择物理层D2D链路同步源标识和产生同步序列；
检测判决模块，用于确定控制发送选择模块的几个参数：小区覆盖范围情况，其它D2D用户的同步信号和同步信道的检测情况；
发送确认模块，用于确定同步信号和同步信道的发送方式并发送所述同步信号和同步信道。
由上述技术方案可见，本发明提供了一种有效的可靠D2D同步方法。
附图说明
图1为采用本发明的设备间通信同步方法的示意图
图2为本发明较佳实施例一的同步方法流程示意图
图3为本发明较佳实施例二的同步方法流程示意图
图4为本发明较佳实施例三的同步方法流程示意图
图5为本申请一较佳装置的组成结构示意图
具体实施方法
为使本申请的目的、技术方案及优点更加清楚明白，以下参照附图并举实施例，对本申请作进一步详细说明。
本发明提出了一种设备间通信(D2D)同步方法，该方法包括：
101：D2D用户根据预设的本UE的发送信号的参考定时的类型与物理层D2D链路同步源标识的对应关系选择物理层D2D链路同步源标识。
102：D2D用户以选择的物理层D2D链路同步源标识产生同步信号的序列并产生同步信号。
103：D2D用户在物理D2D同步信道中(PD2DSCH)中指示本用户是否处于小区覆盖范围内。
104：对于处于小区覆盖内的D2D用户，根据小区的定时在预设的属于覆盖范围内的同步信号的时频资源内发送生成的同步信号和同步信道。
105：对于处于小区覆盖范围外的D2D用户，接收到其他D2D用户的同步信号和同步信道，如果接受到的同步信号的同步源类型为非基于小区定时的同步信号，则该D2D用户根据接收到的同步信号的定时在其他预设的属于覆盖范围外同步信号的的时频资源内转发接收到的同步信号的和步骤103中的同步信道。
106：对于处于小区覆盖范围外的D2D用户，接收到其他D2D用户的同步信号和同步信道，如果接受到的同步信号的同步源类型为基于小区定时的同步信号并且该同步信道的发送用户在同步信道中指示该用户处于小区覆盖范围内，则该D2D用户根据接收到的同步信号的定时在其他预设的覆盖范围外的时频资源内转发接收到的同步信号的和自身的(步骤103中的)同步信道。
107：对于处于小区覆盖范围外的D2D用户，接收到其他D2D用户的同步信号和同步信道，如果接受到的同步信号的同步源类型为基于小区定时的同步信号并且该同步源用户在同步信道中指示该同步源处于小区覆盖范围外，则该D2D用户根据接收到的同步信号的定时在其他预设的覆盖范围外的资源内转发接收到的同步信号的和步骤103中的同步信道；或者，对于处于小区覆盖范围外的D2D用户，接收到其他D2D用户的同步信号和同步信道，如果接受到的同步信号的同步源类型为基于小区定时的同步信号并且该同步源用户在同步信道中指示该同步源处于小区覆盖范围外，则该D2D用户根据接收到的同步信号的定时在其他预设的覆盖范围外的资源内转发送步骤102中的同步信号的和步骤103中的同步信道。
108：对于处于小区覆盖范围外的D2D用户，没有检测到任何参考定时的同步信号时，则该D2D用户在预设的覆盖范围外的资源内发送步骤102中同步信号的和步骤103中的同步信道。
在步骤101中，D2D用户根据自身发送信号参考定时的类型，选择物理层D2D链路同步源标识。
物理层D2D链路同步源标识根据参考定时的不同类型分为两类，如定义物理层同步源标识与参考定时类型的对应关系：
参考定时类型 物理层D2D链路同步源标识
参考定时为小区定时(D2Due_net) (0..167)
参考定时为非小区定时(D2Due_oon) (168..335)
在步骤102中，D2D用户根据选择的物理层D2D链路同步源标识生成同步信号。并将主同步信号 与辅同步信号映射到同步子帧的时频资源上，根据参考定时发送同步子帧。其中，主同步信号的根序列索引可以为预先设置的根序列索引或网络配置的根序列索引，辅同步信号的序列的扰码可以为物理层D2D链路同步源标识。
在步骤103中，D2D用户根据本用户是否处于小区覆盖范围内，在同步信道中指示，如：设置比特为1指示UE处于覆盖内，设置比特为0指示UE处于覆盖范围之外。并根据本用户的信息设置同步信道，如同步信道所处的子帧编号和上下行配置。
在步骤104中，如果D2D用户处于小区覆盖范围内，则该用户根据接收到的小区的下行信号作为发送同步信号的定时，发送步骤102中的同步信号和步骤103中的同步信道。
在步骤105中，如果D2D用户处于小区覆盖范围外，接收到的其他D2D用户发送的同步信号，通过解码同步信号，获得物理层D2D链路同步源标识，根据步骤一中所示的物理层D2D链路同步源标识与同步源类型的对应关系，获得接收到的同步信号的同步源类型，如果接受到的同步信号的同步源类型为非基于小区定时的同步信号，则该D2D用户根据接收到的同步信号的定时在其他预设的覆盖范围外的资源内转发接收到的同步信号的和自身的同步信道。
在步骤106中，如果D2D用户处于小区覆盖范围外，接收到的其他D2D用户发送的同步信号，通过解码同步信号，获得物理层D2D链路同步源标识，根据步骤一中所示的物理层D2D链路同步源标识与同步源类型的对应关系，获得接收到的同步信号的同步源类型，如果接受到的同步信号的同步源类型为基于小区定时的同步信号并且接收到的同步信道中指示该用户处于小区覆盖范围内，则该D2D用户根据接收到的同步信号的定时在其他预设的覆盖范围外的资源内转发接收到的同步信号的和自身的同步信道。
在步骤107中，对于处于小区覆盖范围外的D2D用户，如果D2D用户处于小区覆盖范围外，接收到的其他D2D用户发送的同步信号，通过解码同步信号，获得物理层D2D链路同步源标识，根据步骤一中所示的物理层D2D链路同步源标识与同步源类型的对应关系，获得接收到的同步信号的同步源类型，如果接受到的同步信号的同步源类型为基于小区定时的同步信号并且该同步源用户在同步信道中指示该同步源处于小区覆盖范围外，则该D2D用户根据接收到的同步信号的定时在其他预设的覆盖范围外的资源内发送自身的或转发，同步信号和自身的同步信道。
在步骤108中，对于处于小区覆盖范围外的D2D用户，没有检测到任何参考定时的同步信号时，则该D2D用户在预设的覆盖范围外的资源内发送步骤102中同步信号的和步骤103中的同步信道。
在上述方法中，其他D2D用户在相应的资源内检测所发送的同步信号和同步信道，进行时间和频率的同步，进行设备间的通信。
下面通过几个较佳实施例对本申请技术方案进行进一步详细说明。
实施例一：
步骤201：以处于小区覆盖范围内的D2D用户为例，如果发送同步信号的参考定时是基于小区定时的，则该用户的同步源信号的类型为D2Due_net，根据同步源类型与同步源标识的对应关系，
参考定时类型 物理层D2D链路同步源标识
参考定时为小区定时(D2Due_net) (0..167)
参考定时为非小区定时(D2Due_oon) (168..335)
在对应的同步源标识的组内选择一个同步源标识，如0，
步骤202:该用户以同步源标识作为同步信号序列的扰码，按照标准规定产生同步序列，并从而产生同步信号。
步骤203：该用户将同步信道中的是否在覆盖范围内的标示设置为处于覆盖范围内，并根据本用户的其他信息如同步信道所处的子帧编号和上下行配置配置同步信道。
步骤204：该用户根据接收到的其覆盖小区的下行参考符号的定时在上行载波或上行时隙内发送步骤202和步骤203生成的同步信号和同步信道。
实施例二：
步骤301：以处于小区覆盖范围外的D2D用户为例，该用户接收到其他D2D用户发送的同步信号和同步信道，通过将本地序列与接收到的序列的相关操作，确定接收信道的频率偏差和定时偏差，并获得物理层D2D链路同步源标识，如168。根据同步源类型与同步源标识的对应关系，
参考定时类型 物理层D2D链路同步源标识
参考定时为小区定时(D2Due_net) (0..167)
参考定时为非小区定时(D2Due_oon) (168..335)
确定接收到的同步源类型为D2Due_oon。
步骤302，该用户将收到的物理层D2D链路同步源标识，如168，作为扰码，生成与接收到的同步信号一样的同步信号。
步骤303：该用户将同步信道中的是否在覆盖范围内的标示设置为处于覆盖范围外，并根据本用户的其他信息如同步信道所处的子帧编号和上下行配置配置同步信道。
步骤304：该用户在其他的预先规定的属于覆盖范围外的同步信号的时频资源内，即与接收到的同步信号不同的资源内，发送步骤302中的同步信号和步骤303中的同步信道。
实施例三
步骤401：以处于小区覆盖范围外的D2D用户为例，该用户接收到其他D2D用户发送的同步信号和同步信道，通过将本地序列与接收到的序列的相关操作，确定接收信号的频率偏差和定时偏差，并 获得物理层D2D链路同步源标识，如0。根据同步源类型与同步源标识的对应关系，
参考定时类型 物理层D2D链路同步源标识
参考定时为小区定时(D2Due_net) (0..167)
参考定时为非小区定时(D2Due_oon) (168..335)
确定接收到的同步源类型为D2Due_net。
步骤402，该用户通过解码同步信道，进而获得接收的同步信号来自小区覆盖范围内的用户，则该用户将收到的物理层D2D链路同步源标识，如0，作为扰码，生成与接收到的同步信号一样的同步信号。
步骤403：该用户将同步信道中的是否在覆盖范围内的标示设置为处于覆盖范围外，并根据本用户的其他信息如同步信道所处的子帧编号和上下行配置配置同步信道。
步骤404：该用户在预先规定的属于覆盖范围外的同步信号的时频资源内，发送步骤402中的同步信号和步骤403中的同步信道。
以上所述仅为本申请的较佳实施例而已，并不用以限制本申请，凡在本申请的精神和原则之内，所做的任何修改，等同替换，改进等，均应包含在本申请的保护范围之内。

Claims (12)

  1. 一种设备间通信的同步方法，其特征在于，包括：
    D2D用户根据预定义的本用户发送信号的参考定时类型与物理层D2D链路同步源标识的对应关系选择物理层D2D链路同步源标识；
    D2D用户根据所述选择的D2D链路同步源标识产生相应的同步信号；
    D2D用户检测自己是否处于小区覆盖范围内，如果不处于小区覆盖范围内，D2D用户还检测是否接收到其它D2D用户的同步信号和同步信道；D2D用户根据所述检测情况来发送同步信号和同步信道；其中D2D用户在物理D2D同步信道中指示本用户是否处于小区覆盖范围内。
  2. 根据权利要求1所述的方法，其特征在于，如果所述D2D用户处于小区覆盖内，根据小区的定时在预设的属于覆盖范围内的同步信号的时频资源内发送同步信号和同步信道。
  3. 根据权利要求1所述的方法，其特征在于，如果所述D2D用户处于小区覆盖范围外，并接收到其他D2D用户的同步信号和同步信道，根据所述接收到的同步信号的同步源参考定时类型和所述接收到的同步信道中的覆盖指示来确定同步信号和同步信道的发送。
  4. 根据权利要求1所述的方法，其特征在于，如果所述D2D用户处于小区覆盖范围外，并没有检测到任何其他D2D用户的同步信号和同步信道，则所述D2D用户在预设的覆盖范围外的资源内发送所述用户自身的同步信号的和同步信道。
  5. 根据权利要求3所述的方法，其特征在于，所述处于小区覆盖范围外的D2D用户，如果接收到的其它D2D用户的同步信号的同步源类型为非基于小区定时的同步信号，则所述D2D用户根据接收到的同步信号的定时在其他预设的属于覆盖范围外同步信号的时频资源内转发接收到的同步信号的和自身的同步信道。
  6. 根据权利要求3所述的方法，其特征在于，所述处于小区覆盖范围外的D2D用户，如果接收到的其它D2D用户的同步信号的同步源类型为基于小区定时的同步信号并且接收到的同步信道中指示接收到的用户处于小区覆盖范围内，则所述D2D用户根据接收到的同步信号的定时在其他预设的覆盖范围外的时频资源内转发接收到的同步信号的和所述D2D用户自身的同步信道。
  7. 根据权利要求3所述的方法，其特征在于，所述处于小区覆盖范围外的D2D用户，如果接收到的其它D2D用户的同步信号的同步源类型为基于小区定时的同步信号并且接收到的同步信道中指示接收到的该用户处于小区覆盖范围外，则所述D2D用户根据接收到的同步信号的定时在其他预设的覆盖范围外的资源内转发接收到的同步信号的和所述D2D用户自身的同步信道；或者所述D2D用户根据接收到的同步信号的定时在其他预设的覆盖范围外的资源内转发所述用户自身的同步信号的和同步信道。
  8. 根据权利要求1至7任一项所述的方法，其特征在于，所述参考定时类型包括小区定时和非小区定时。
  9. 根据权利要求1至7任一项所述的方法，其特征在于，所述D2D用户根据所述选择的D2D链路同步源标识确定Zadoff-Chu序列并生成主同步信号和辅同步信号，并将主同步信号与辅助同步信号映射到同步子帧的时频资源上，根据参考定时发送同步子帧，其中，主同步信号的根序列索引可以为预先设置的根序列索引或网络配置的根序列索引，辅同步信号的序列的扰码可以为物理层D2D链路同步源标识。
  10. 根据权利要求2所述的方法，其特征在于，所述D2D用户根据接收到的小区的下行信号作为发送同步信号的定时。
  11. 根据权利要求3所述的方法，其特征在于，所述D2D用户通过解码接收到的其他D2D用户发送的同步信号，获得物理层D2D链路同步源标识，根据预定义的物理层D2D链路同步源标识与同步源参考定时类型的对应关系，获得接收到的同步信号的同步源类型。
  12. 一种装置，包括初始化模块、检测判决模块、发送控制模块，其特征在于：
    初始化模块，用于根据预定义的本用户发送信号的参考定时类型与物理层D2D链路同步源标识的对应关系选择物理层D2D链路同步源标识和产生同步序列；
    检测判决模块，用于确定发送控制模块的参数：小区覆盖范围情况，其它D2D用户的同步信号和同步信道的检测情况；
    发送控制模块，用于确定同步信号和同步信道的发送方式并发送所述同步信号和同步信道。
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