CN104272850A - D2d连接恢复方案 - Google Patents

D2d连接恢复方案 Download PDF

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CN104272850A
CN104272850A CN201380017295.7A CN201380017295A CN104272850A CN 104272850 A CN104272850 A CN 104272850A CN 201380017295 A CN201380017295 A CN 201380017295A CN 104272850 A CN104272850 A CN 104272850A
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H·李
李庆华
朱源
陈晓刚
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Abstract

描述了用于在LTE网络中恢复终端(UE)之间的D2D连接的方案。可以在其中在两个UE之间建立了D2D连接、但是由于例如UE中的一个进入睡眠状态而使D2D连接丢失的情形下应用这些方案。可以将这些方案应用于集中式或分布式的D2D系统。这些方案中的一些方案是eNB辅助的，而其它方案仅由UE来执行。

Description

D2D连接恢复方案
相关申请
本申请要求享有于2013年1月28日递交的美国专利申请序列号No.13/751,252的优先权的权益，该美国专利申请要求享有于2012年4月13日递交的美国临时专利申请序列号No.61/624,185的优先权的权益，故以引用方式将这两个申请的全部内容并入本文。
背景技术
设备到设备(D2D)通信是一种用于提高LTE(长期演进)和其它蜂窝网络性能的手段。在D2D通信中，终端(在LTE中称为用户装置或UE)直接彼此相通信，而不是通过基站(在LTE中称为演进型节点B或eNB)来连接。因为D2D设备之间的短距离，在两个或更多个D2D设备之间的D2D通信典型地是非常本地的，并且因此使用非常低的发射功率。D2D通信还是用于提高蜂窝系统中的资源的空间重用以获得较高的吞吐量的有力方式。本公开内容处理与恢复D2D设备之间丢失的连接相关的D2D通信的方面。
附图说明
图1示出了用于D2D通信的示例性UE设备以及eNB。
图2示出了在一个实施例中的用于D2D连接恢复的方案。
图3示出了在一个实施例中的用于D2D连接恢复的方案。
图4示出了在一个实施例中的用于D2D连接恢复的方案。
图5示出了在一个实施例中的用于D2D连接恢复的方案。
图6示出了在一个实施例中的用于D2D连接恢复的方案。
具体实施方式
以下的描述和附图充分说明了特定的实施例，以使得本领域技术人员能够实施它们。其它的实施例可以包括结构性的、逻辑的、电的、过程的变化和其它变化。一些实施例的部分和特征可以被包括在其它实施例的部分和特征中、或者被其它实施例的部分和特征所替代。在权利要求中所阐述的实施例包含这些权利要求的所有可用的等效项。
D2D通信作为LTE网络的底层(underlay)可以实现为集中式或分布式的系统。在后一情况下，充当D2D设备的UE直接进行通信而不需要任何eNB的参与。这样的分布式架构仅仅在D2D通信是带外的、使用除经许可的频谱之外的资源的情况下是适合的。当D2D通信发生在与LTE蜂窝通信相同的经许可的频带中时，集中式系统是必须的，其中eNB保持对无线资源的控制。也就是说，eNB负责允许UE之间的D2D通信的发生，并且负责分配将在D2D链路中使用的时间-频率资源。
在集中式或分布式的D2D系统中，存在着在初始地建立两个UE设备之间的D2D链路时所涉及的开销。如果在两个设备之间建立的D2D连接将丢失，则将为此期望用于高效地重建该D2D连接的机制，以避免与连接的建立相关联的开销。本文描述了用于针对集中式或分布式的D2D系统的D2D连接恢复的方案。这些方案中的一些方案是eNB辅助的，而其它方案仅由UE来执行。
系统描述
图1示出了UE D1和UE D2的例子，其中每个UE包括连接到射频(RF)收发电路22接口的处理器21，RF收发电路22连接到一个或多个天线23。基站或eNB 40示出为具有连接到RF收发电路42的处理器41，RF收发电路42连接到多个天线43。所示出的组件旨在表示用于为LTE和D2D通信两者提供空中接口和用于执行如本文所描述的处理功能的任意类型的硬件/软件配置。在图中所示出的实施例中，UE D1和UE D2两者经由LTE链路与eNB 40通信，并且经由D2D链路相互通信。
D2D连接恢复方案
在一些实施例中，D2D连接恢复方案适合用于其中具有已建立的D2D连接的UE进入睡眠状态(即，功率节省模式)的情形。可以将在该情况下的D2D连接恢复实现为非eNB辅助的方案或eNB辅助的方案。
在非eNB辅助的D2D连接恢复方案的例子中，假定UE D1和UE D2具有已建立的D2D连接。当D2将要进入功率节省模式时，其可以向UE D1通知其何时将不再处于睡眠模式(Twakeup)，Twakeup要么与睡眠状态的持续时间相对应，要么与实际的唤醒时间相对应。可选地，D2还可以使用上行链路控制信道来向eNB进行发送。D1可以确认睡眠消息，以使得D2知晓当D2唤醒时D1将是可用的。在接收到来自D1的确认消息之后，D2可以随后进入其睡眠状态，其中在该点处进入睡眠状态可以是以从D1接收到确认为条件。在Tsleep时间之后，D2唤醒，并且向D1发送D2D恢复请求。D1随后利用D2D恢复响应来进行响应，并且D2D连接被恢复。D2可以向eNB通知或者可以不向eNB通知D2D连接恢复。
由于与eNB操作相关联的控制开销，因此在D2D连接恢复过程中eNB的参与越少，从效率的角度看就越好。然而，在一些情况下，在D2和D1中的一个进入睡眠或者别的不活动状态之前，D2和D1不能进行协商。例如，一个设备可能经历不正常的断电。或者，在发送或接收睡眠状态通知时、或者在协商一致同意的睡眠时间Tsleep时可能存在故障。在这些或其它这样的情况下，eNB可以被配置为如在以下中所描述的来辅助恢复D2D连接。假定D1与D2之间的D2D连接丢失。D1想要恢复与D2的D2D连接，但是不了解关于D2将何时唤醒。D1向eNB发送D2D恢复请求，并且eNB检查D2的状态。如果D2处于空闲模式，则eNB将告知D1在针对D2的下一寻呼周期期间何时进行重试。在寻呼周期的时间，eNB通知D2进入用于D2D恢复的连接模式，并且要求D1监视和测量D2的上行链路控制信道。基于由D1向eNB所发送的测量报告，eNB决定是否可以恢复D2D连接。如果答案为是，则eNB通知D1和D2两者进行D2D连接恢复。
在另一个实施例中，当D1想要恢复与D2的D2D连接但是不了解D2将何时唤醒时，其向eNB发送D2D恢复请求。如果eNB曾经从D2接收到Twakeup通知，则eNB将向D1发送Twakeup。D1将在那时尝试执行与D2的D2D重新连接。如果eNB不具有关于Twakeup的这种信息，则eNB向D1通知D2的寻呼时间，使得D1可以如上文所描述的在D2的寻呼周期期间尝试D2D重新连接。
在另一个实施例中，当D1向eNB发送D2D恢复请求时，如果eNB曾经从D2接收到Twakeup通知，则eNB可以利用时间Twakeup和D2的寻呼时间两者来对D1进行响应。D1可以在时间Twakeup与该寻呼时间之间作出关于何时应当尝试D2D连接恢复的选择。例如，如果该寻呼时间大大早于Twakeup，则将选择前者(如果D2D重新连接更紧急的话，例如，要求低延迟)。D1可以利用参数Treconnect_selected来通知eNB关于所选择的D2D重新连接时间，该参数Treconnect_selected是关于选择寻呼时间还是选择Twakeup的指示符。如果寻呼周期时间用于D2D重新连接，则eNB可以要求D1在寻呼周期期间执行对D2的测量以便进行发射功率调整。eNB可以随后利用对D1所请求的D2D重新连接的指示来寻呼D2。在D2进入连接模式后，D1和D2两者恢复它们的D2D连接。
图2示出了用于在UE D1与UE D2之间的D2D连接恢复的示例性方案，该示例性方案不涉及eNB 40。在步骤201，在D1与D2之间建立D2D连接。在步骤202，D2向D1通知：D2正进入睡眠状态并且将在时间Twakeup唤醒。在步骤204，D2还可以可选地通知eNB。在步骤205，D1确认消息，并且告知D2其将在时间Twakeup唤醒。步骤206示出了D1和D2两者都在时间Twakeup唤醒。在步骤207，D1向D2发送D2D连接恢复请求，并且在步骤208，D2对该请求进行响应。(替代地，D2可以向D1发送D2D连接恢复请求)。在步骤209，所述D2D连接被恢复。
图3示出了用于在UE D1与UE D2之间的D2D连接恢复的示例性方案，该示例性方案的确涉及eNB 40。在步骤301，在D1与D2之间建立D2D连接。在步骤302，D2向eNB通知D2正进入睡眠状态并且将在时间Twakeup唤醒，但是不通知D1。在步骤303，D1利用D2D恢复请求向eNB通知：其想要与D2重建所述D2D连接。在步骤304，eNB向D1发送D2的唤醒时间Twakeup。然后，D1可以或者可以不进入睡眠状态，但是，在步骤305，D1和D2两者都唤醒。在步骤306，D1向D2发送D2D连接恢复请求，并且在步骤307，D2对该请求进行响应。(替代地，D2可以向D1发送D2D连接恢复请求。)在步骤308，D2D连接被恢复。在步骤309，D1或D2可以可选地向eNB通知所述D2D连接已经被恢复。
图4示出了用于在UE D1与UE D2之间的D2D连接恢复的示例性方案，该示例性方案涉及eNB 40，其中D2进入睡眠状态而不向D1或者eNB通知其唤醒时间。在步骤401，在D1与D2之间建立D2D连接，并且随后D2进入睡眠状态而不通知D1或eNB。在步骤402，D1向eNB发送D2D恢复请求，该D2D恢复请求表示其想要与D2重建所述D2D连接。在步骤403，作为响应，eNB向D1发送针对D2的下一个寻呼时间。在步骤404，D1可以进入睡眠状态，但是在针对D2的寻呼时间之前被唤醒。在步骤405，D1再次向eNB发送D2D恢复请求，该D2D恢复请求表示其想要与D2重建D2D连接。在步骤406，eNB请求D1监视和测量当D2在PRACH(物理随机接入信道)上对寻呼进行响应或者在上行链路控制信道上进行发送时D2的传输。在步骤407，由eNB寻呼D2。在步骤408，D2在PRACH上执行网络重接入过程。在步骤409，D1向eNB发送其对D2的传输的测量报告。如果基于测量报告，eNB认为D1与D2之间的信道质量足够支持D2D链路，则在步骤410，向D1和D2两者发送D2D恢复授权。在步骤411，D1向D2发送D2D连接恢复请求，并且在步骤412，D2对该请求进行响应。(替代地，D2可以向D1发送D2D连接恢复请求。)在步骤413，所述D2D连接被恢复。
图5示出了用于在UE D1与UE D2之间的D2D连接恢复的示例性方案，该示例性方案涉及eNB 40，其中D2在向eNB通知其唤醒时间之后进入睡眠状态。在步骤501，在D1与D2之间建立D2D连接，并且随后在步骤502，D2进入睡眠状态，向eNB通知其唤醒时间Twakeup，但不通知D1。在步骤503，D1向eNB发送D2D恢复请求，该D2D恢复请求表示其想要与D2重建所述D2D连接。在步骤504，作为响应，eNB向D1发送针对D2的下一个寻呼时间和D2的唤醒时间Twakeup。在步骤505，D1选择D2的寻呼时间(假定其早于时间Twakeup)，通知eNB，并且可以进入睡眠状态直到恰好在D2的寻呼时间之前。在步骤506，D1再次向eNB发送D2D恢复请求，该D2D恢复请求表示其想要与D2重建所述D2D连接。在步骤507，eNB请求D1监视和测量当D2在PRACH(物理随机接入信道)上对寻呼进行响应或者在上行链路控制信道上进行发送时D2的传输。在步骤508，eNB寻呼D2。在步骤509，D2在PRACH上执行网络重新进入过程，并且在步骤510，D1向eNB发送其对D2的传输的测量报告。如果基于测量报告，eNB认为D1与D2之间的信道质量足够支持D2D链路，则在步骤511，向D1和D2两者发送D2D恢复授权。在步骤512，D1向D2发送D2D连接恢复请求，并且在步骤513，D2对该请求进行响应。(替代地，D2可以向D1发送D2D连接恢复请求)。在步骤514，所述D2D连接被恢复。
图6示出了与图5中所阐述的方案相类似的用于在UE D1与D2之间的D2D连接恢复的方案，该方案涉及eNB 40，但是其中，为了与D2重建D2D连接，D1选择D2的唤醒时间而不是其寻呼时间，要么是因为D2的唤醒时间更早要么是出于其它原因。在步骤601，在D1与D2之间建立D2D连接，并且随后在步骤602，D2进入睡眠状态，向eNB通知其唤醒时间Twakeup，但不通知D1。在步骤603，D1向eNB发送D2D恢复请求，该D2D恢复请求表示其想要与D2重建所述D2D连接。在步骤604，作为响应，eNB向D1发送针对D2的下一个寻呼时间和D2的唤醒时间Twakeup。在步骤605，D1选择时间Twakeup(假定其早于D2的寻呼时间)，通知eNB，并且可以进入睡眠状态直到恰好在时间Twakeup之前。在步骤607，D1向D2发送D2D连接恢复请求，并且在步骤608，D2对该请求进行响应。(替代地，D2可以向D1发送D2D连接恢复请求)。在步骤609，所述D2D连接被恢复。
示例性实施例
在一个实施例中，一种用于在LTE网络中作为用户装置(UE)来进行操作的设备包括：无线收发机，其用于提供用于与eNB通信和用于D2D通信的空中接口；以及连接到所述无线收发机的处理电路，其用于：与第二UE建立D2D通信会话；并且，如果从第二UE接收到指示第二UE将进入睡眠状态以及唤醒时间的消息，则向第二UE发送确认消息，以及在所指示的唤醒时间，向第二UE发送D2D恢复消息，并且等待对其的响应以便重建所述D2D通信会话。所述处理电路还用于：如果第二UE进入睡眠状态，但是没有从第二UE接收到指示所述唤醒时间的消息，则向所述eNB发送D2D恢复请求；如果从所述eNB接收到对所述D2D恢复请求的响应，其中所述响应指示下一个寻呼时间，并且如果第二UE在所述寻呼时间对寻呼进行响应，则在所述寻呼时间向第二UE发送D2D恢复消息，并且等待对其的响应以便重建所述D2D通信会话。所述处理电路还可以用于：如果第二UE进入睡眠状态，但是没有从第二UE接收到指示所述唤醒时间的消息，则向所述eNB发送D2D恢复请求；如果从所述eNB接收到对所述D2D恢复请求的响应，其中所述响应指示由第二UE先前发送给所述eNB的唤醒时间，则在所述唤醒时间向第二UE发送D2D恢复消息，并且等待对其的响应以便重建所述D2D通信会话。所述处理电路还可以用于：如果由所述eNB请求这样做，则测量由第二UE当在物理随机接入信道(PRACH)上对寻呼进行响应时所发送的信号，并且将测量报告发送回所述eNB；以及，仅当响应于所发送的测量报告而由所述eNB授权这样做时，在所述寻呼时间向第二UE发送D2D恢复消息，并且等待对其的响应以便重建所述D2D通信会话。所述处理电路还可以用于：如果由所述eNB请求这样做，则测量由第二UE在对所述寻呼进行响应之后在上行链路控制信道上所发送的信号，并且将测量报告发送回所述eNB；以及，如果响应于所发送的测量报告而由eNB授权这样做，则在所述寻呼时间向第二UE发送D2D恢复消息，并且等待对其的响应以便重建所述D2D通信会话。
在另一个实施例中，一种用于在LTE网络中作为用户装置(UE)来进行操作的设备包括：无线收发机，其用于提供用于与eNB通信和用于D2D通信的空中接口；以及连接到所述无线收发机的处理电路，其用于：与第一UE建立D2D通信会话；如果在建立所述D2D通信会话之后将进入睡眠状态，则向第一UE发送指示唤醒时间的消息；以及，如果从第一UE接收到响应于向其发送所述唤醒时间的确认消息，并且如果在所述唤醒时间从第一UE接收到D2D恢复请求，则对所述D2D恢复请求进行响应以便重建D2D通信会话。所述处理电路还可以用于：如果在建立所述D2D通信会话之后将进入睡眠状态，则向所述eNB发送指示唤醒时间的消息。所述处理电路还可以用于：在与第一UE重建所述D2D通信会话之后，向所述eNB发送指示所述D2D通信会话已经被重建的消息。
在另一个实施例中，一种用于在LTE网络中操作eNB的方法，包括：响应于从第一用户装置(UE)和第二UE接收到的信道预留请求，为第一UE与第二UE之间的D2D通信分配时频资源；在第一UE与第二UE之间的D2D通信会话已经被建立、并且第二UE进入睡眠状态之后，通过向第一UE发送针对第二UE的寻呼时间来对来自第一UE的D2D恢复请求进行响应。所述方法还可以包括：在第一UE与第二UE之间的D2D通信会话已经被建立并且第二UE进入睡眠状态并向所述eNB发送唤醒时间之后，通过向第一UE发送针对第二UE的所述唤醒时间来对来自第一UE的D2D恢复请求进行响应。所述方法还可以包括：在向第一UE发送针对第二UE的寻呼时间之后，在所述寻呼时间向第二UE发送寻呼连同对来自第一UE的所述D2D恢复请求的指示。所述方法还可以包括：在从第一UE接收D2D恢复请求之后，发送测量请求，所述测量请求请求第一UE测量由第二UE当在物理随机接入信道(PRACH)上对寻呼进行响应时所发送的信号。所述方法还可以包括：在从第一UE接收D2D恢复请求之后，请求第一UE测量由第二UE在上行链路控制信道上对寻呼进行响应之后所发送的信号。所述方法还可以包括：在从第一UE接收响应于测量请求的测量报告之后，确定所测量的信号是否是足够的，向第一UE和第二UE发送D2D恢复授权。
在另一个实施例中，一种用于在LTE网络中操作UE的方法，包括：与第二UE建立D2D通信会话；如果从第二UE接收到指示第二UE将进入睡眠状态的消息，则协商针对第二UE从所述睡眠状态唤醒的唤醒时间；以及向第二UE发送D2D恢复消息，并且等待对其的响应以便重建所述D2D通信会话。所述方法还可以包括：如果第二UE进入睡眠状态，但是没有从第二UE接收到指示唤醒时间的消息，则向eNB发送D2D恢复请求；如果从所述eNB接收到对所述D2D恢复请求的响应，其中所述响应指示下一个寻呼时间，并且如果第二UE在所述寻呼时间对寻呼进行响应，则在所述寻呼时间向第二UE发送D2D恢复消息，并且等待对其的响应以便重建所述D2D通信会话。所述方法还可以包括：如果第二UE进入睡眠状态，但是没有从第二UE接收到指示所述唤醒时间的消息，则向所述eNB发送D2D恢复请求；如果从所述eNB接收到对所述D2D恢复请求的响应，其中所述响应指示由第二UE先前发送给eNB的唤醒时间，则在所述唤醒时间向第二UE发送D2D恢复消息，并且等待对其的响应以便重建所述D2D通信会话。所述方法还可以包括：如果由所述eNB请求这样做，则测量由第二UE当在物理随机接入信道(PRACH)上对寻呼进行响应时所发送的信号，并且将测量报告发送回eNB；以及，仅当响应于所发送的测量报告而由所述eNB授权这样做时，在所述寻呼时间向第二UE发送D2D恢复消息，并且等待对其的响应以便重建所述D2D通信会话。所述方法还可以包括：如果由所述eNB请求这样做，则测量由第二UE在对寻呼进行响应之后在上行链路控制信道上所发送的信号，并且将测量报告发送回所述eNB；以及，如果响应于所发送的测量报告而由所述eNB授权这样做，则在所述寻呼时间向第二UE发送D2D恢复消息，并且等待对其的响应以便重建所述D2D通信会话。所述方法还可以包括：与第一UE建立D2D通信会话；如果在建立所述D2D通信会话之后将进入睡眠状态，则向第一UE发送指示唤醒时间的消息；如果从第一UE接收到响应于向其发送所述唤醒时间的确认消息，并且如果在所述唤醒时间从第一UE接收到D2D恢复请求，则对所述D2D恢复请求进行响应以便重建所述D2D通信会话。
如上文所描述的实施例可以实现为用于操作的方法和/或通过可包括用于执行实施这些方法的指令的处理器的各种硬件配置来实现。这样的指令可以包含在适当的存储介质中，可以从该适当的存储介质向存储器或其它处理器可执行的介质传送这样的指令。
已经在LTE网络的背景下描述了本主题。除了将出现不一致的地方之外，可以在其它类型的蜂窝网络中使用本主题，其中分别由对终端和基站的引用来替代对UE和eNB的引用。
已经结合前述的特定实施例来描述了本主题。应当意识到，还可以以被认为是有利的任何方式来结合那些实施例。此外，众多替代方案、变型和修改对于本领域普通技术人员来说将是显而易见的。其它这样的替代方案、变型和修改旨在落入以下所附权利要求的范围内。
提供摘要是为了符合要求摘要的37C.F.R.Section 1.72(b)，该摘要将允许读者确定本技术公开内容的实质和要点。提交摘要时要理解，它将不用于限制或解释权利要求的范围或含义。由此将以下权利要求并入具体实施方式中，其中每项权利要求本身代表单独的实施例。

Claims (20)

1.一种用户装置(UE)设备，包括：
无线收发机，其用于提供用于与eNB(演进型节点B)通信和用于D2D(设备到设备)通信的空中接口；以及
连接到所述无线收发机的处理电路，其用于：
与第二UE建立D2D通信会话；
如果从所述第二UE接收到指示所述第二UE将进入睡眠状态以及唤醒时间的消息，则向所述第二UE发送确认消息，以及在所指示的唤醒时间，向所述第二UE发送D2D恢复消息，并且等待对其的响应以便重建所述D2D通信会话。
2.如权利要求1所述的设备，其中，所述处理电路还用于：
如果所述第二UE进入睡眠状态，但是没有从所述第二UE接收到指示所述唤醒时间的消息，则向所述eNB发送D2D恢复请求；
如果从所述eNB接收到对所述D2D恢复请求的响应，其中所述响应指示下一个寻呼时间，并且如果所述第二UE在所述寻呼时间对寻呼进行响应，则在所述寻呼时间向所述第二UE发送D2D恢复消息，并且等待对其的响应以便重建所述D2D通信会话。
3.如权利要求1所述的设备，其中，所述处理电路还用于：
如果所述第二UE进入睡眠状态，但是没有从所述第二UE接收到指示所述唤醒时间的消息，则向所述eNB发送D2D恢复请求；
如果从所述eNB接收到对所述D2D恢复请求的响应，其中所述响应指示由所述第二UE先前发送给所述eNB的唤醒时间，则在所述唤醒时间向所述第二UE发送D2D恢复消息，并且等待对其的响应以便重建所述D2D通信会话。
4.如权利要求2所述的设备，其中，所述处理电路还用于：
如果由所述eNB请求这样做，则测量由所述第二UE当在物理随机接入信道(PRACH)上对所述寻呼进行响应时所发送的信号，并且将测量报告发送回所述eNB；以及，
仅当响应于所发送的测量报告而由所述eNB授权这样做时，在所述寻呼时间向所述第二UE发送D2D恢复消息，并且等待对其的响应以便重建所述D2D通信会话。
5.如权利要求2所述的设备，其中，所述处理电路还用于：
如果由所述eNB请求这样做，则测量由所述第二UE在对所述寻呼进行响应之后在上行链路控制信道上所发送的信号，并且将测量报告发送回所述eNB；以及，
如果响应于所发送的测量报告而由所述eNB授权这样做，则在所述寻呼时间向所述第二UE发送D2D恢复消息，并且等待对其的响应以便重建所述D2D通信会话。
6.一种用户装置(UE)设备，包括：
无线收发机，其用于提供用于与eNB(演进型节点B)通信和用于D2D(设备到设备)通信的空中接口；以及
连接到所述无线收发机的处理电路，其用于：
与第一UE建立D2D通信会话；
如果在建立所述D2D通信会话之后将进入睡眠状态，则向所述第一UE发送用于指示唤醒时间的消息；
如果从所述第一UE接收到响应于向其发送所述唤醒时间的确认消息，并且如果在所述唤醒时间从所述第一UE接收到D2D恢复请求，则对所述D2D恢复请求进行响应以便重建所述D2D通信会话。
7.如权利要求6所述的设备，其中，所述处理电路还用于：如果在建立所述D2D通信会话之后将进入睡眠状态，则向所述eNB发送指示唤醒时间的消息。
8.如权利要求6所述的设备，其中，所述处理电路还用于：在与所述第一UE重建所述D2D通信会话之后，向所述eNB发送指示所述D2D通信会话已经被重建的消息。
9.一种用于在LTE(长期演进)网络中操作演进型节点B(eNB)的方法，包括：
响应于从第一用户装置(UE)和第二UE接收到的设备到设备(D2D)信道预留请求，为所述第一UE与所述第二UE之间的D2D通信分配时频资源；
在所述第一UE与所述第二UE之间的D2D通信会话已经被建立并且所述第二UE进入睡眠状态之后，通过向所述第一UE发送针对所述第二UE的寻呼时间来对来自所述第一UE的D2D恢复请求进行响应。
10.如权利要求9所述的方法，还包括：在所述第一UE与所述第二UE之间的D2D通信会话已经被建立并且所述第二UE进入睡眠状态并向所述eNB发送唤醒时间之后，通过向所述第一UE发送针对所述第二UE的所述唤醒时间来对来自所述第一UE的D2D恢复请求进行响应。
11.如权利要求9所述的方法，还包括：
在向所述第一UE发送针对所述第二UE的寻呼时间之后，在所述寻呼时间向所述第二UE发送寻呼连同对来自所述第一UE的所述D2D恢复请求的指示。
12.如权利要求9所述的方法，还包括：在从所述第一UE接收D2D恢复请求之后，发送测量请求，所述测量请求请求所述第一UE测量由所述第二UE当在物理随机接入信道(PRACH)上对寻呼进行响应时所发送的信号。
13.如权利要求9所述的方法，还包括：
在从所述第一UE接收D2D恢复请求之后，请求所述第一UE测量由所述第二UE在上行链路控制信道上对寻呼进行响应之后所发送的信号。
14.如权利要求12所述的方法，还包括：
在从所述第一UE接收响应于所述测量请求的测量报告之后，确定所测量的信号是否是足够的，向所述第一UE和所述第二UE发送D2D恢复授权。
15.一种用于操作用户装置(UE)的方法，包括：
与第二UE建立设备到设备(D2D)通信会话；
如果从所述第二UE接收到指示所述第二UE将进入睡眠状态的消息，则协商针对所述第二UE从所述睡眠状态唤醒的唤醒时间；以及
向所述第二UE发送D2D恢复消息，并且等待对其的响应以便重建所述D2D通信会话。
16.如权利要求15所述的方法，还包括：
如果所述第二UE进入睡眠状态，但是没有从所述第二UE接收到指示所述唤醒时间的消息，则向eNB发送D2D恢复请求；
如果从所述eNB接收到对所述D2D恢复请求的响应，其中所述响应指示下一个寻呼时间，并且如果所述第二UE在所述寻呼时间对寻呼进行响应，则在所述寻呼时间向所述第二UE发送D2D恢复消息，并且等待对其的响应以便重建所述D2D通信会话。
17.如权利要求15所述的方法，还包括：
如果所述第二UE进入睡眠状态，但是没有从所述第二UE接收到指示所述唤醒时间的消息，则向所述eNB发送D2D恢复请求；
如果从所述eNB接收到对所述D2D恢复请求的响应，其中所述响应指示由所述第二UE先前发送给所述eNB的唤醒时间，则在所述唤醒时间向所述第二UE发送D2D恢复消息，并且等待对其的响应以便重建所述D2D通信会话。
18.如权利要求16所述的方法，还包括：
如果由所述eNB请求这样做，则测量由所述第二UE在物理随机接入信道(PRACH)上对所述寻呼进行响应时所发送的信号，并且将测量报告发送回所述eNB；以及，
仅当响应于所发送的测量报告而由所述eNB授权这样做时，在所述寻呼时间向所述第二UE发送D2D恢复消息，并且等待对其的响应以便重建所述D2D通信会话。
19.如权利要求16所述的方法，还包括：
如果由所述eNB请求这样做，则测量由所述第二UE在对所述寻呼进行响应之后在上行链路控制信道上所发送的信号，并且将测量报告发送回所述eNB；以及，
如果响应于所发送的测量报告而由所述eNB授权这样做，则在所述寻呼时间向所述第二UE发送D2D恢复消息，并且等待对其的响应以便重建所述D2D通信会话。
20.如权利要求15所述的方法，还包括：
与第一UE建立D2D通信会话；
如果在建立所述D2D通信会话之后将进入睡眠状态，则向所述第一UE发送指示唤醒时间的消息；
如果从所述第一UE接收到响应于向其发送所述唤醒时间的确认消息，并且如果在所述唤醒时间从所述第一UE接收到D2D恢复请求，则对所述D2D恢复请求进行响应以便重建所述D2D通信会话。
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