CN105594140A - Lte网络中用于小区间d2d发现的信令 - Google Patents

Lte网络中用于小区间d2d发现的信令 Download PDF

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CN105594140A
CN105594140A CN201480053377.1A CN201480053377A CN105594140A CN 105594140 A CN105594140 A CN 105594140A CN 201480053377 A CN201480053377 A CN 201480053377A CN 105594140 A CN105594140 A CN 105594140A
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serving cell
enb
discovery
information
resource pool
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CN105594140B (zh
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D·查特吉
A·霍里亚夫
S·潘特列夫
M·希洛夫
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Apple Inc
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Intel IP Corp
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Abstract

本发明总体上描述了一种演进型节点B(eNB)、用户设备(UE)和LTE网络中用于基于邻近的服务和设备对设备(D2D)发现的信令发送的方法的实施例。一些实施例中，eNB可以通过如下方式支持小区间设备对设备(D2D)的发现：向第一用户设备(UE)发送信令，以指示用于包括由一个或多个相邻小区配置的D2D资源的D2D发现资源池的配置信息。该配置信息包括第一UE的服务小区与一个或多个相邻小区间的时偏。本发明还涉及其他装置和方法。

Description

LTE网络中用于小区间D2D发现的信令
优先权要求
本申请要求序列号为61/898,425的美国临时专利申请，该申请于2013年10月31日提交，其全部内容被援引加入到本申请中。
技术领域
实施例适用于无线通信。一些实施例涉及3GPPLTE(LongTermEvolution；长期演进)网络。一些实施例涉及直接设备对设备(D2D：device-to-device)通信。一些实施例涉及LTE网络中的设备发现。
背景技术
基于邻近的应用和服务代表一种快速发展的社会性和技术性趋势，其主要影响蜂窝无线/移动宽带技术的演进。这些服务基于彼此临近的两个设备或两个用户相互知晓，并可以包括如公共安全操作、社交网络、移动商业、广告、游戏等应用。设备对设备(D2D)发现是实现D2D服务的第一步。关于D2D通信的设备发现，尤其是关于小区间基于邻近的服务(ProSe：ProximityService)D2D发现仍存在很多未解决的问题。
附图说明
图1示出可以实现一些实施例的示例操作环境。
图2依据一些实施例示出无线信道的一部分。
图3是依据一些实施例支持小区间D2D发现的方法的流程图。
图4是依据一些实施例的通信设备的基本组件的框图。
图5是执行多个实施例的机器的框图。
具体实施方式
下面的说明书以及附图充分地示出了能够使本领域技术人员实施的特定实施例。其他实施例可以结合结构上的、逻辑上的、电路上的、程序上以及其他形式上的改变。一些实施例的部分和特征被包含进或被代入其他实施例的部分和特征。权利要求中的前述实施例包括这些权利要求所有可用等同布置。
图1示出可以实现一些实施例的示例操作环境100。操作环境100中，演进型节点B(eNB)102在服务小区106内散播同步信号103。一些实施例中，操作为同步源或对等射频头(PRH：peerradiohead)(图1未示出)的如UE之类的移动设备能够散播这些同步信号103。PRH也能够作为同步参考点服务。一些实施例中，同步信号103可以包括定义通用定时基准的信息。
在不同实施例中，位于服务小区106内的一个或多个UE108可以接收来自eNB102的同步信号103，并根据由同步信号103定义的通用定时基准利用这些同步信号103进入同步操作模式。一个或多个UE108可以支持LTE基于邻近的服务(ProSe)。一些实施例中，位于服务小区106外的UE110可能不能接收到来自eNB102的同步信号103，并操作在异步模式下。相对于服务小区106，这些UE110在一个或多个相邻小区112内操作。
同步模式下的UE108利用同步发现协议以使用发现信号104来发现彼此。依据同步发现协议，在预定周期时间间隔期间，同步模式下的UE108可能只需监控空中接口和/或通过空中接口发送发现信号104。同步发现协议可以包括低占空比以允许同步模式下的UE108在周期时间间隔之间中进入睡眠状态，从而在同步模式下的UE108的部分节省能量。但是，异步模式下的UE110可能不能使用同步发现协议，而是需要使用异步发现协议。异步发现协议可需要异步模式下的UE110持续性地发送发现信号104和/或持续性地监控用于由其他UE108发送的发现信号104的空中接口，导致功耗水平显著增加。因此，其他操作中小区间设备对设备(D2D)发现可能变难或变得不能实现。
图2依据一些实施例示出无线信道200的一部分。如图2所示，分配无线信道200的时间资源的一部分以实现发现资源池(discoveryresourcepool)202，同时无线信道200的其他时间资源被包括在非发现时间间隔204中。无线信道200还包括无线通知域(discoveryannouncementregion)206。
为了节约与发现操作相关的功率，同步模式下的UE，如UE108(图1)，只能在发现资源池202期间，利用和/或监控无线信道200，而在非发现时间间隔204期间不能这么做。但是，依据哪个发现资源池202从非发现时间间隔204被划界出来，异步模式下的UE，如UE110(图1)可能不知晓通用定时基准。因此，为了保证它们在同步模式下的UE108正在监控无线信道200的期间发送发现信号，现有系统中的异步模式下的UE110可能被强制持续性地发送这种发现信号。这将导致在非发现时间间隔204期间，在无线信道200上与非发现通信发生干扰，并且增加异步模式下的UE110的部分的功耗，从而进一步使小区间D2D发现操作变得复杂。
为了指导这些以及其他关系，实施例提供一种支持小区间D2D发现的装置和方法，该装置和方法可以应用于异步网络布置。依据布置的同步特性(如时分双工(TDD：time-divisionduplexing)系统中的同步布置，或典型频分双工(FDD：frequency-divisionduplexing)系统中的同步布置)，可以以多种不同方式支持小区间D2D发现。基于相邻小区之间协调的水平、用于小区间D2D发现的UE终端处可用的网络辅助(networkassistance)的水平等，还可以不同地支持小区间D2D发现。
对于同步布置，可以实现D2D发现资源池的网络通用配置，因而可相当地简化小区间D2D发现过程。对于异步布置，D2D发现资源池通常可以以小区特定方式被配置，并且实施例可以提供避免相邻小区的D2D发现资源的重叠的方法，从而避免异步干扰，这将比控制同步干扰更加困难。至少一些eNB间协调可帮助最小化异步小区之间的重叠的D2D发现资源池。因此，一些实施例提供至多多个无线电帧的粗糙的eNB间时间分辨率。
除了相邻小区的D2D发现资源池的配置信息外，支持小区间D2D发现的参与UE还使用用于小区的同步参考时间和频率同步源信息去发现其他UE。实施例提供一种使相邻小区的D2D发现资源池的配置信息可用于期望参与小区间D2D发现的UE。
关于参考时间和频率同步源信息，在一些当前系统中，基于相邻小区的主同步信号(PSS：primarysynchronizationsignal)、辅同步信号(SSS：secondarysynchronizationsignal)或定位参考信号(PRS：positioningreferencesignal)，UE能够直接从相邻小区获得这些信息。但是，并不是所有UE都能够获得相邻小区的PSS/SSS/CRS。依照当前长期演进(LTE)规范，UE要求宽带信号具有至少-6dB的信噪比(SINR：signaltonoiseratio)以检测PSS/SSS，但是，远近效应可能阻止一些UE检测相邻小区的PSS/SSS。因此，至少对于这些UE，D2D发现性能会降低。作为使用PSS/SSS/CRS获得这类信息的替代，实施例提供UE将服务小区的D2D发现资源池配置信息、参考时间信息以及频率同步信息中继到其他可以由相邻小区服务的UE的方法。
一些实施例中，eNB102或PRH能够选择UE108或一组UE以中继相应服务小区的传输定时，使得属于其他小区且邻近的UE能够使用该“两跳(two-hop)”同步参考以获得用于小区间发现的相邻小区的时间和频率同步。因此，依照实施例，eNB102包括硬件处理电路以向已选择UE108或一组UE发送已由相邻小区112配置的D2D发现资源池的配置信息。配置信息将包括UE108的服务小区106和相邻小区112之间的时偏(timingoffset)。虽然仅描述了一个相邻小区112，但实施例不限于此，且配置信息可以包括由多个相邻小区112配置的多个D2D发现资源池的配置信息。所选UE108接着可将部分或所有的这些信息中继给服务小区106外的其他UE。
为了使得UE108执行该中继，eNB102将给UE108分配资源，UE108使用这些资源周期性传输服务小区106的同步信息。在每次出现D2D发现资源池202(图2)的开始，这些资源还能包括发现通知信号的时间资源，该发现通知信号包括相应发现通知域206的数据(图2)。
一些实施例中，发现通知信号可以是与同步信号相同的信号。但是，一些实施例中，中继UE108可能需要比发送发现通知信号更加频繁地(即比出现D2D发现资源池202更加频繁)发送同步信号。虽然发现通知信号除了用于服务小区106的同步信息外，还能够携带D2D发现资源池配置信息，但UE108可能需要比由发现通知信号指示的资源池配置信息更加频繁地中继用于服务小区的同步信息。这是因为，根据相邻小区之间的同步/异步特性(nature)的水平，如果这些被中继的同步信号仅作为发现通知信号的一部分刚好在相应小区的D2D发现资源池之前被发送，则接收同步和配置信息的UE不能获得小区的时间/频率同步。这将至少提出两个问题。第一，因为除了在每次周期性出现发现资源池的开始时的发现通知信号的传输之外，还要额外地周期性传输周期比传统发现周期短的同步信号，所以UE将展现增加的功耗。第二，对于该“中继”同步信号的传输，需要资源分配。
为了解决第二个问题，eNB102可以分配上述资源，使得UE108向相邻小区112中的其他UE如UE110发送同步信息比UE108发送发现通知信号更频繁(即比出现D2D发现资源池更加频繁)。
对于第一个问题，例如，如果服务和相邻小区之间的粗略时偏的信息由各个相应的服务小区传送(signaled)至相关联的UE，则能够最小化功耗的增加。如果该粗略时偏信息被传送，则发现通知信号自身便足够使UE获得小区间发现操作的同步，因而避免分别中继服务小区的同步信息的需求。
但是，在一些环境中，发现通知信号自身可能不足以提供该同步信息。至少在这些情况下，eNB102将给所选UE分配资源以中继该同步信息。eNB102可以分配这些资源使得UE108能够比出现D2D发现资源池更加频繁地发送同步信息。
eNB102还可以分配资源以避免从由不同小区服务的UE中继来的同步信息的传输的重叠。一个实施例中，eNB102能够预留用于中继服务小区106的同步信息的子帧，以降低或消除用于中继服务小区106的同步信息的子帧与中继相邻小区112中的一个或多个服务小区的同步信息的子帧的重叠。这在相应D2D发现资源池202不重叠的情况下显得特别重要。尤其是，一些实施例中，为此，eNB102能够在D2D发现资源池202内的的每个第K个子帧上(如“同步中继子帧”)上预留时频资源，其中K大于1。其他实施例中，eNB102为此在服务小区106的一组可用D2D子帧内的每个第K个子帧上预留时频资源。
在同步信号是窄带信号的实施例中，UE108可以使用这些同步中继子帧的未使用的物理资源块(PRB：physicalresourceblock)对，以传输发现信号104。但是，UE108应保证对同步信号传输的充分保护以免于带内发射(in-bandemission)的影响。例如，由于在同步中继子帧的相邻PRB对中以最大传输功率在小区106中发送的其他发现信号104所产生的带内发射的高干扰，小区112(图1)中的监听UE110不能接收由小区106中的UE108中继的同步信号。因此，在实施例中，除了那些在被分配用于传输发现通知信号或所中继的同步信号的子帧上携带所中继的同步信号的传输功率之外，eNB102可以限定PRB上的D2D传输的传输功率，使得传输功率小于最大传输功率。同步中继子帧上的最大传输功率值可以预定义或者通过较高层由网络100配置。
应注意的是，实际所测量的带内发射的影响可依赖于被选择用来中继服务小区同步信号的UE的数量。通常地，仅使一些所选UE中继该信息才有益于最小化对UE功耗的影响。
除了D2D发现资源池内散置的同步中继子帧之外，eNB102还可以在D2D发现资源池之间配置额外的子帧作为同步中继子帧以增加获取相邻小区112的同步信息的速度和可靠性。对于两类同步中继子帧，在频率维度(frequencydimension)上，由UE发送的实际同步信号均可以被限定到中心PRB对，使得上述一组PRB对位于系统上行链路(UL)带宽的中心。可替代地，eNB102能够根据相对于系统UL带宽的中心的小区特定偏移分配一组PRB对。这类在频率维度上的小区特定映射对两个D2D发现资源池之间出现的同步中继子帧是更加有益于避免属于不同相邻小区的UE所发送的同步信号的重叠。
eNB102还可以分配资源以满足其他额外标准(additionalcriteria)。例如，被选择用来中继特定小区的同步信息的UE可以将它们中继的同步信号在相同物理资源上发送以受益于单频网络(SFN：singlefrequencynetworks)增益，同时能够折衷有效时延扩展(effectivedelayspread)的增加。但是，一些实施例通过为D2D发现资源池配置扩展循环前缀(CP：cyclicprefix)可减少可用时延扩展。
图3是依据一些实施例支持小区间D2D发现的方法300的流程图。参考图1-图2的元素，描述示例方法300。eNB102(图1)能够执行方法300的至少一些操作使得UE108和110能够获得小区间D2D发现所需的信息。通过非限定示例，且如本文中前面所述，这类信息能够包括相邻小区的参考时间和频率同步源信息以及相邻小区的D2D发现资源池的配置信息。
在操作302中，eNB102向UE108发送信令以指示用于至少设备对设备(D2D)发现资源池202的配置信息。该配置信息包括UE108的服务小区106与一个或多个相邻小区112间的时偏。每个D2D发现资源池202包括已由相应相邻小区112配置的D2D资源。关于多个不同实施例而言，虽然已经描述了一个相邻小区112，但可以理解的是，可将信息提供给多个相邻小区之间的小区间D2D发现。
在操作304中，，eNB102给UE108分配资源，用于由UE108的周期性传输服务小区106的同步信息。如本文前面所述，eNB102能够依据不同标准分配资源以实现不同效果。例如，eNB102能够分配资源使得UE108能够向相邻小区钟的UE108发送同步信息比UE108发送发现通知信号更加频繁。
eNB102能够执行作为示例方法300的一部分的其他操作以支持小区间D2D发现。例如，eNB102可以限定D2D传输的传输功率，并且eNB102可以给PRB对分配资源，以避免中继服务小区的同步信息的子帧和中继相邻小区中的一个或多个相邻小区的同步信息的子帧之间的重叠。
图4是依据一些实施例的通信设备400的基本组件的框图。通信设备400可以适用作UE108或110(图1)或eNB102(图1)。根据参考图1-图3描述的上述实施例，通信设备400可以支持小区间D2D发现的方法。应注意的是，当通信设备400充当eNB102时，通信设备400可以是静止和非移动的。
在一些实施例中，通信设备400可以包括一个或多个处理器，并可以被配置成具有存储在计算机可读存储设备的指令。当通信设备400充当UE108时，指令可使通信设备400接收信令以指示至少一个相邻小区112(图1)的D2D发现资源池的配置信息。如本文前面所述，信令还可以包括服务小区106(图1)和至少一个相邻小区112之间的时偏，使得通信设备400能够接收和解读来自服务小区106外的UE的发现信号104。通信设备400接着能够向服务小区106外的第二通信设备发送包括时偏和服务小区106的同步信息的发送通知信号。
当通信设备400充当eNB102(图1)时，指令将使通信设备400向UE108(图1)发送信令，以指示D2D发现资源池的配置信息。如本文前面所述，配置信息将包括用于该UE108的服务小区106(图1)和相邻小区112之间的时偏。虽然描述了一个相邻小区112，但可以理解的是，实施例并不限于此，时偏可以被提供给与服务小区相关的任意数量的相邻小区。
通信设备400可以包括使用一个或多个天线401向其他通信设备发送和从其接收信号的物理层电路402。物理层电路402还可以包括用于控制对无线介质的访问的介质访问控制(MAC)电路404。通信设备400还可以包括配置成执行本文所描述的操作的处理电路406和存储器408。一些实施例中，物理层电路402和处理电路406可以配置成执行图1-图3所述的操作。
根据一些实施例，MAC电路404可以被配置成竞争无线介质，并配置用于无线介质上的通信的子帧或分组，并且物理层电路402可以被配置成发送和接收信号。物理层电路402可以包括调制/解调电路、上变换/下变换电路、滤波电路和放大电路等。
一些实施例中，通信设备400的处理电路406可以包括一个或多个处理器。一些实施例中，两个或多个天线401可以耦合到配置成发送和接收信号的物理层电路402。存储器408可以存储用于配置处理电路406以执行配置和发送消息帧的操作并执行本文所述的各种不同操作的信息。存储器408可以包括任意类型的存储器，包括非暂时性存储器，用于存储机器(如计算机)可读形式的信息。例如，存储器408可以包括计算机可读存储设备、只读存储器(ROM)，随机存取存储器(RAM)、磁盘存储介质、光存储介质、闪存设备和其他存储设备和介质。
天线401可以包括一个或多个定向或全向天线，例如包括偶极子天线、单极子天线、贴片天线、环形天线、微带天线或其他适于传输RF信号的天线。一些实施例中，具有多孔径的单个天线可以替代两个或更多个天线被使用。这些实施例中，每个孔径可以认为是单独的天线。一些多输入多输出(MIMO：multiple-inputmultiple-output)实施例中，这些天线可以按可能在上述天线中的每一个和发送站的天线之间引起的的空间多样性和不同的信道特性有效分开。
一些实施例中，通信设备400可以包括键盘、显示器、非易失性存储器端口、多天线(multipleantennas)、图形处理器、应用处理器、扬声器和其他移动设备组件中的一个或多个。显示器可以是包括触摸屏的LCD屏。
一些实施例中，通信设备400可以是便携无线通信设备的一部分，便携无线通信设备例如为个人数字助理(PDA)、具有无线通信能力的膝上型或便携计算机、上网本(webtablet)、无线电话、智能电话、无线耳机、寻呼机、即时消息设备(instantmessagingdevice)、数字相机、接入点、电视，医疗设备(如心率监测器、血压监测器等)或其他可以无线接收和/或发送信息的设备。
虽然通信设备400被示出为具有多个分开的功能元件，但这些功能元件中的两个或多个可以被组合或以软件配置的元件的组合实现，例如包括数字信号处理器(DSP)的处理元件，和/或其他硬件元件。例如，一些元件可以包括一个或多个微处理器、DSP、现场可编程门阵列(FPGA)、专用集成电路(ASIC)、射频集成电路(RFIC)以及用于执行本文所述的至少一种功能的各种硬件和逻辑电路的组合。一些实施例中，通信设备400的功能元件可以指一个或多个处理元件上操作的一个或多个处理器。
实施例可以以硬件、固件和软件单独或组合实施。实施例也可实施为存储在计算机可读设备的指令，该指令可以由至少一个处理器读取和执行以执行本文所述的操作。计算机存储设备可以包括任意的以机器(计算机)可读形式存储信息的非易失性存储机构。例如，计算机可读存储设备可以包括只读存储器(ROM)、随机存取存储器(RAM)、磁盘存储介质、光存储介质、闪存设备和其他存储设备和介质。
图5是用于执行不同实施例的机器500的框图。在可替换实施例中，机器500可操作为独立(standalone)设备或可以被连接至(如网络连接)其他机器。
机器(如计算机系统)500可以包括硬件处理器502(如中央处理单元(CPU)、图形处理单元(GPU)、硬件处理器核或其任意组合)、主存储器504和静态存储器506，其一部分或全部能够通过互链(interlink)508(如总线)彼此通信。机器500还可以包括电源管理设备532、图形显示设备510、字母数字输入设备512(如键盘)和用户界面(UI)导航设备514(如鼠标)。一些实施例中，图形显示设备510、字母数字输入设备512和UI导航设备514可以是触摸屏显示器。机器500另外还可以包括存储设备516(即驱动单元)、信号生成设备518(如扬声器)、与天线530耦合的网络接口设备/收发器520、和一个或多个传感器528，如全球定位系统(GPS)传感器、指南针、加速器和其他传感器。机器500可以包括输出控制器534，如串行(如通用串行总线(USB)、并行或其他的与一个或多个外围设备(如打印机，读卡器等)通信或控制一个或多个外围设备的的有线或无线连接(如红外(IR)，近场通信(NFC)等)。
存储设备516可以包括机器可读介质522，其上存储有以本文所述技术或功能中的任意一个或多个实施或利用的一组或多组数据结构或指令524(如软件)。指令524还可以在机器500执行期间，全部或至少部分地存在于主存储器504内，静态存储器506内或硬件处理器502内。在一个示例中，硬件处理器502、主存储器504、静态存储器506和存储设备516中的一个或任意组合可组成机器可读介质。
虽然机器可读介质522被示出为单一介质，但术语“机器可读介质”可以包括配置成存储一个或多个指令524的单一介质或多个介质(如集中式或分布式数据库，和/或组合缓存和服务器)。
术语“机器可读介质”可以包括任意能够存储、编码或携带由机器500执行的指令524、并且能够使机器500执行本发明的技术中的任意一个或多个的、或能够存储、编码或携带指令524使用的或与指令524相关的数据结构的介质。非限定机器可读介质示例可以包括固态存储器和光磁介质。在一个示例中，大规模机器可读介质可以包括带有具有多个静止质量的颗粒的机器可读介质。大规模机器可读机器的具体示例可以包括：非易失性存储器，如半导体存储设备(如电可编程只读存储器(EPROM)，或电可擦除可编程只读存储器(EEPROM))和闪存设备；磁盘，如内置硬盘和可移动盘；磁光盘；和CD-ROM和DVD-ROM盘。
指令524还可以经由利用多个传输协议中的任一种(如帧中继(framerelay)、因特网协议(IP)、传输控制协议(TCP)、用户数据报协议(UDP)、超文本传输协议(HTTP)等)的网络接口设备/收发器520，利用传输介质来发送或接收。
尽管关于一些实施例，已经描述了本发明主题，但并不意在其限定于本文前述特定形式。本领域技术人员应认识到，根据本公开，可以组合所描述的实施例的各种技术特征。此外，应意识到，在不背离本发明范围内的情况下，本领域技术人员可以做出各种变形和替换。
摘要被提供以符合37C.F.RSectionl.72(b)，其中要求摘要要使读者弄清技术公开的特征和要点。需要指出并理解的是，摘要不被用作限定或解释权利要求的范围或含义。因此所附权利要求特此加入到具体实施方式中，每个权利要求靠其自身作为单独的实施例。

Claims (22)

1.一种演进型节点B(eNB)，所述eNB包括硬件处理电路，所述硬件处理电路配置成：通过如下方式支持小区间设备对设备(D2D)发现：向第一用户设备(UE)发送信令，以指示用于D2D发现资源池的配置信息，所述D2D发现资源池由相邻小区配置，所述配置信息包括所述第一UE的服务小区与所述相邻小区间的时偏。
2.如权利要求1所述的eNB，其中所述硬件处理电路还配置成给所述第一UE分配资源，以便由所述第一UE周期性地发送所述服务小区的同步信息。
3.如权利要求2所述的eNB，其中所述资源包括每次开始出现所述D2D发现资源池时的发现通知信号的时间资源。
4.如权利要求3所述的eNB，其中分配所述资源使得所述第一UE发送同步信息比所述第一UE发送所述发现通知信号更加频繁。
5.如权利要求2所述的eNB，其中在频率维度上，将所述资源限定为一组物理资源块(PRB)对，其中所述一组PRB位于系统上行链路带宽的中心。
6.如权利要求2所述的eNB，其中在频率维度上，将所述资源限定为一组物理资源块(PRB)对，其中根据相对于系统上行链路带宽的中心的小区特定偏移，分配所述一组PRB对。
7.如权利要求2所述的eNB，其中所述硬件处理电路还配置成，除了那些在被分配用于传输发现通知信号或中继的同步信号的子帧上携带中继的同步信号的物理资源块(PRB)对，限定其他PRB上的用于D2D传输的传输功率，使得所述传输功率比最大传输功率小。
8.如权利要求2所述的eNB，其中所述硬件处理电路还配置成：
预留用于中继所述第一UE的服务小区的同步信息的子帧，使得用于中继所述服务小区的同步信息的子帧与用于中继所述相邻小区中的一个或多个相邻小区的同步信息的子帧之间无重叠。
9.如权利要求8所述的eNB，其中所述硬件处理电路还配置成，预留同步中继子帧，所述D2D发现资源池内的每个第K个子帧用于中继所述第一UE的服务小区的同步信息，其中K大于1。
10.如权利要求8所述的eNB，其中所述硬件处理电路还配置成，预留同步中继子帧，所述第一UE的服务小区的一组可用D2D子帧中的每个第K个子帧用于中继所述第一UE的服务小区的同步信息，其中K大于1。
11.如权利要求1所述的eNB，其中所述硬件处理电路还配置成，在eNB服务的小区内选择一组UE，以中继用于小区间D2D发现的所述同步信息和D2D发现资源池配置信息。
12.一种适用于基于邻近的服务(ProSe)并在服务小区内操作的用户设备(UE)，所述UE包括硬件处理电路，所述硬件处理电路配置成：
接收信令以指示用于至少一个相邻小区的设备对设备(D2D)发现资源池的配置信息，所述信令还包括所述服务小区与所述至少一个相邻小区间的时偏；
向所述服务小区外的第二UE发送发现通知信号，所述发现通知信号包括所述服务小区的同步信息。
13.如权利要求12所述的UE，其中所述硬件处理电路还配置成：
发送传送所述服务小区的同步信息的同步信号。
14.如权利要求13所述的UE，其中所述硬件处理电路还配置成：
周期性地并比所述UE发送发现通知信号更加频繁地发送所述同步信号，其中所述发现通知信号包括用于所述D2D发现资源池的配置信息。
15.如权利要求14所述的UE，其中所述硬件处理电路按照由所述服务小区规定的周期，周期性地发送所述同步信号。
16.如权利要求13所述的UE，其中所述硬件处理电路还配置成：
基于来自eNB的包括所述相邻小区的D2D发现资源池的配置信息和所述UE的服务小区与所述相邻小区间的时偏的信令，并且
进一步基于通过接收由所述相邻小区中的一个或多个UE发送的发现通知信号的定时获得的所述相邻小区的同步信息，
通过检测所述相邻小区的D2D发现资源池内的相邻小区的发现信号，来发现该相邻小区中的UE。
17.一种方法，包括：
向第一用户设备(UE)发送信令，以向设备对设备(D2D)发现资源池指示配置信息，所述D2D发现资源池包括已被一个或多个相邻小区配置的D2D资源，所述配置信息包括所述第一UE的服务小区与所述一个或多个相邻小区间的时偏。
18.如权利要求17所述的方法，还包括，给所述第一UE分配资源，以便由所述第一UE周期性地发送所述服务小区的同步信息。
19.如权利要求18所述的方法，还包括：
除了那些在被分配用于传输发现通知信号或中继的同步信号的子帧上携带中继的同步信号的物理资源块(PRB)对，限定其他PRB上的用于D2D传输的传输功率，使得所述传输功率比最大传输功率小。
20.如权利要求19所述的方法，还包括：
给中继所述第一UE的服务小区的同步信息分配资源，使得用于中继所述服务小区的同步信息的子帧与用于中继所述相邻小区中的一个或多个相邻小区的同步信息的子帧之间无重叠。
21.一种非暂时性计算机可读存储介质，其存储有由一个或多个处理器执行的指令，使得演进型节点B(eNB)配置成：
向第一用户设备(UE)发送信令，以指示用于设备对设备(D2D)发现资源池的配置信息，所述D2D发现资源池包括已被一个或多个相邻小区配置的D2D资源，所述配置信息包括所述第一UE的服务小区与所述一个或多个相邻小区间的时偏。
22.如权利要求21所述的非暂时性计算机可读存储介质，包括进一步的指令，使得：
给所述第一UE分配资源，以便由所述第一UE周期性传输所述服务小区的同步信息，其中所述资源还包括每次开始出现所述D2D发现资源池时的发现通知信号的时间资源，其中将所述资源分配成：所述第一UE发送同步信息比所述第一UE发送所述发现通知信号更加频繁。
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