CN104737619B - 用于在lte系统中的小数据传输的永久在线的承载 - Google Patents

用于在lte系统中的小数据传输的永久在线的承载 Download PDF

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CN104737619B
CN104737619B CN201380044721.6A CN201380044721A CN104737619B CN 104737619 B CN104737619 B CN 104737619B CN 201380044721 A CN201380044721 A CN 201380044721A CN 104737619 B CN104737619 B CN 104737619B
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enb
carrying
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mme
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CN104737619A (zh
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P·贾殷
V·拉奥
A·S·斯托扬诺夫斯基
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Apple Inc
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Intel Corp
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Abstract

当在LTE系统中的UE进入RRC_空闲状态时，仅保留S5/S8EPS承载上下文，并且释放S1‑AP和无线承载。当所述UE返回RRC_连接状态时，必须在每个UE的基础上重建这些承载。大量UE应用可能会频繁地发送小数据，这会使所述UE在空闲状态与连接状态之间转换。随着UE在空闲状态与连接状态之间转变，必须频繁地重建无线承载和S1‑U承载，这便导致大量的信令开销。本文描述的是提供了一种减少该信令开销的永久在线的S1‑U承载的方法和系统。

Description

用于在LTE系统中的小数据传输的永久在线的承载
优先权请求
本申请要求于2012年9月28日提交的美国临时申请序列号NO.61/707784的优先权，该申请的全部内容通过引用的方式被并入本文。
技术领域
本文所描述的实施例概括而言涉及无线网络和通信系统。
背景技术
在LTE(长期演进)蜂窝系统中，正如第三代合作伙伴计划(3GPP)的LTE规范中所阐述的，移动终端(其中，终端在LTE系统中被称为用户设备或者UE)连接至基站(在LTE系统中被称为演进型节点B或者eNB)，基站为UE提供了到连接至外部网络(例如，互联网)的LTE系统的其他网络实体的连接。提供这样的网络连接涉及：在LTE系统的不同部件之间设立被称为承载的双向数据路径。当UE从空闲状态转变为连接状态时设立这些承载，而当UE空闲时，为了提高效率，则将这些承载拆除。然而，一些LTE应用可能会涉及频繁的小数据传输，其中，在每次这样的传输之后，UE均转变为空闲状态。在这些情况下重复地设立和拆除承载导致大量的信令开销。减少所述信令开销是本公开的目的。
附图说明
图1示出了LTE系统的主要网络实体；
图2示出了节省S1-MME信令的永久在线的S1-U承载的操作示例；
图3示出了具有永久在线指示符的RRC连接请求的示例；
图4示出了永久在线的S1-U承载的增强型附着过程的示例；
图5示出了增强型S1-释放消息序列的示例；
图6示出了S1释放呼叫流决策的示例；
图7示出了利用S-GW重定位的跟踪区更新的示例；
图8示出了修改的服务请求的示例；
图9示出了永久在线的S1-U承载的下行链路数据传输的示例；
图10示出了利用S-GW重定位的eNB重定位的示例；
图11示出了在X2接口上将安全上下文从旧eNB传输至新eNB的示例；
图12示出了使用配置传输过程将安全上下文从旧eNB传输至新eNB的示例。
具体实施方式
LTE的高级架构可以被描述为包括三个主要部分：用户设备(UE)；演进型UMTS陆地无线接入网(E-UTRAN)以及演进型分组核心(EPC)，其中，E-UTRAN连同EPC一起被称为EPS(演进型分组系统)。UE可以是蜂窝电话或者与由单个部件(演进型节点B(eNB))组成的E-UTRAN进行无线通信的其他装置。eNB与EPC进行通信，继而EPC与在外部世界(例如，互联网)中的分组数据网络进行通信。
图1示出了LTE系统的主要网络实体，其中，特定实体可以包括：处理电路系统，在其附图标记中加入后缀“a”；网络接口电路系统，在其附图标记中加入后缀“b”；以及具有一个或者多个天线的射频(RF)收发机，在其附图标记中加入后缀“c”。eNB 105向UE 100提供RF通信链路，RF通信链路有时被称为LTE无线或者空中接口。eNB是在被称作小区的一个或者多个地理区域中服务UE的基站。UE每次与一个eNB进行通信，并且随着UE移动，在被称为“移交”的过程中，可以切换至另一eNB。eNB向其小区中的所有UE提供上行链路数据信道和下行链路数据信道，并且在UE与EPC之间转发数据业务。eNB还通过向UE发送信令消息来控制它们的低级操作。EPC的主要部件被示出为：MME 110(移动管理实体)、HSS125(归属用户服务器)、S-GW 115(服务网关)、以及P-GW 120(分组数据网络(PDN)网关)。MMW控制UE的高级操作，所述高级操作包括：对通信会话、安全性和移动性的管理。每一个UE都被分配给可以随着UE的移动而改变的单个服务MME。HSS是包含有关所有网络运营商的订户的信息的中央数据库。P-GW是与外部世界的接触，并且与一个或者多个分组数据网络(例如，互联网)交换数据的EPC的点。S-GW充当了在eNB与P-GW之间的路由器。和MME一样，每一个UE都被分配给可以随着UE的移动而改变的单个服务S-GW。
空中接口在UE与eNB之间提供了通信路径。网络接口在eNB与EPC之间以及在EPC的不同部件之间提供了通信路径。网络接口包括：在eNB与MME之间的S1-MME接口；在eNB与S-GW之间的S1-U接口；在不同的eNB之间的X2接口；在不同的MME之间的S10接口；在MME与HSS之间的S6a接口；在S-GW与P-GW之间的S5/S8接口；以及在P-GW与PDN之间的SGi接口。这些网络接口可以代表在底层传送网络上传输的数据。
在高电平下，在图1中的网络实体依靠分组流在所述网络实体之间的接口上进行通信，其中，分组流被称为由具体协议所设立的承载。UE与eNB使用数据无线承载和信令无线承载(SRB)二者在空中接口上进行通信。eNB利用类似名字的承载(S1-MME承载还可以被称为S1-AP(S1应用协议)承载)在S1-MME网络接口上与MME通信，并且在S1-U网络接口上与S-GW通信。数据无线承载、S1-U承载、以及S5/S8承载的组合被称为EPS承载。每当UE连接至PDN时，EPC均设立被称为默认承载的一个EPS承载。UE随后可以接收被称为专用承载的其他EPS承载。
以上所论述的每一个接口均与网络实体使用来交换数据的协议栈相关联。将在LTE中的协议分为用户平面协议和控制平面协议。用户平面通过所谓的AS(接入层)来携带用户数据，并且包括用于以下接口的协议：在UE与eNB之间的空中接口；在eNB与S-GW之间的S1-U接口；以及在S-GW与P-GW之间的S5/S8接口。S1-U和S5/S8接口的用户平面部分使用GTP协议(GPRS(通用分组无线业务)隧道协议)，以用于传送IP分组。GTP封装原始IP分组，以确保分组在UE与适当的eNB之间流动。
控制平面负责控制在UE与网络之间的连接，并且包括用于在UE与eNB之间的空中接口的协议栈，RRC(无线资源控制)协议位于该协议栈的顶部。RRC是用于AS的主要控制协议，其负责使用RRC信令在eNB与UE之间建立无线承载，并且配置更低层。在UE与MME之间运行并且在UE中位于RRC上方的控制平面协议被称为NAS(非接入层)协议，并且包括EMM(EPS移动性管理)协议和ESM(EPS会话管理协议)。NAS协议由MME使用，以管理UE与EPC的连通性。因为NAS协议不存在于eNB中，因此RRC和S1-AP(S1应用协议)分别在UE与eNB之间以及在eNB与MME之间被用作NAS消息的传送协议。
在当前的3GPP LTE架构中，UE执行若干步骤，以用于将自身附着至EPS。首先，它建立与eNB的RRC连接来设立SRB(信令无线承载)，从而从所谓的RRC_空闲(RRC_IDLE)状态移至RRC_连接(RRC_CONNECTED)状态。在建立RRC连接之后，UE设立S1-MME承载。随后，设立S5/S8、S1-U、以及无线承载来形成EPS承载。至网络的该附着在每个UE的基础上发生，并且涉及大量不同数据隧道的创建。当UE进入RRC_空闲状态时，仅保留S5/S8EPS承载上下文，并且释放S1-U、S1-AP和无线承载。当UE返回RRC_连接状态时，必须在每个UE的基础上重建这些承载。一些UE应用可能会频繁地发送小数据，这会使UE在空闲状态与连接状态之间转换。随着UE在空闲状态与连接状态之间转变，必须频繁地重建无线承载和S1-U承载，这将导致大量的信令开销。
永久在线的S1-U承载
对于在重建隧道的同时避免过多信令开销的解决方案是具有默认的、永久在线的S1-U承载。当UE进入RRC_空闲模式时，可以保持相关联的S1-U信息，从而当UE从空闲状态醒来时，不需要重建S1-U承载。即，当处于RRC_空闲状态的UE转变至RRC_连接状态时，仅需要建立无线承载，而不需要S1-MME信令。在图2中示出的阶段1至10是根据一个实施例的方案，其涉及UE、eNB、S-GW、以及P-GW。阶段1是创建由无线承载、S5/S8承载、以及永久在线的S1-U承载组成的EPS承载的UE的附着过程。在阶段2中，UE处于连接模式，并且正在利用频繁的小数据传输来运行应用。在阶段3中，在eNB处的用户不活动定时器到期，这告诉eNB将UE置于空闲模式。在阶段4中，当RRC连接由eNB释放时，UE保留用于永久在线的S1-U承载的、S-GWIP(互联网协议)地址和S-GW TIED(隧道端点标识符)。在阶段5中，eNB保留UE上下文；以及在阶段6中，S-GW保留有关永久在线的S1-U承载的信息并且维持S5/S8承载。在阶段7中，UE进入空闲模式。在阶段8中，UE向eNB发出NAS服务请求(例如，因为其具有数据需要发送)并且将保留的S-GW信息在消息中附带给eNB。在阶段8a中，重建无线承载，以及在阶段8b中，eNB使用附带的S-GW信息将无线承载连接至永久在线的S1-U承载。在阶段9中，S-GW使用保留的上下文信息将永久在线的S1-U承载映射到S5/S8承载。由此，在阶段10中，在不涉及S1-MME信令的情况下，重建EPS承载。
呼叫流的修改
下面所描述的是对现有呼叫流进行修改，以便实现永久在线的S1-U承载的概念。对附着过程、S1-释放过程、服务请求过程、S-GW重分配过程、以及移交过程的修改进行了描述。当UE请求永久在线的S1-U承载时，eNB和MME二者都需要感知。在一个实施例中，在RRC信令中使用“永久在线指示符”来通知eNB。RRC连接请求消息包括UE身份和建立原因。介绍了新的建立原因，即，永久在线的S1-U承载，以便指示UE想要创建如图3所示的永久在线的S1-U承载，图3列出了RRC连接请求消息的IE(信息单元)。所述永久在线指示符通知eNB：S1-U承载为静态的、永久在线的承载，以及在S1-释放过程期间，eNB不应该删除UE上下文。增加的建立原因提供了对于要求用于移动发起接入或者移动终止接入的永久在线的S1-U承载的请求的指示。
可以通过使eNB在如上所描述的接收到S1-U承载的UE请求之后，在Sl-AP初始UE消息中转发永久在线指示符作为“RRC建立原因”信息单元的一部分，从而使MME可以感知要求永久在线的S1-U承载的UE请求。可替代的，NAS消息还可以用于向MME传达：它需要建立永久在线的S1-U承载。关于附着请求消息，新指示符可以以如下中的一种方式来发送信号：1)可以增强用于指示所请求的附着的类型的字段EPS附着类型，以指示具有S1-U永久在线的承载的新附着类型；2)以及，附加的更新类型IE可以用于指示具有S1-U永久在线的承载的新附着类型；或者，3)可以在附着请求消息中定义新IE。相似地，其他NAS消息(例如，服务请求或者追踪区域更新请求)可以包括永久在线的S1-U指示。在接收到具有永久在线的S1-U指示的NAS请求之后，通知MME：将建立永久在线的承载，从而使MME在S1释放期间不删除UE上下文信息。
附着过程的增强
可以适当地修改在3GPP TS 23.401的5.3.2章节中所描述的附着过程，从而有助于使用永久在线指示符来创建用于包括MTC(机器类型通信)应用在内的应用的永久在线的承载。在一个实施例中，当UE频繁地发送/接收小数据时，UE可以首先指示：其需要永久在线的承载。该指示可以被附带在RRC连接请求消息上或者在附着请求消息上。该指示通知eNB在S1-释放期间不要删除UE上下文。相同的指示还可以被发送至MME和S-GW，以便在请求永久在线的S1-U承载时保留UE上下文和EPS承载信息。
在一个实施例中，允许MME对永久在线的S1-U承载的需要进行验证。取决于用户简档或者其他用户行为，网络运营商可以任选地在HSS中的用户订阅简档中(使用永久在线的S1-U)配置最佳的附着。如果该参数被激活，则该参数被下载至MME作为更新位置过程的一部分。在MME将创建会话请求消息发送至S-GW，从而创建永久在线的承载之前，MME验证在HSS中的订阅数据，并且如下面图4的阶段11所示的确认对永久在线的承载的需要。
在一个实施例中，以如下方式来通知S-GW永久在线的S1-U承载。MME选择S-GW并且分配用于与UE相关联的默认承载的EPS承载标识。然后MME将创建会话请求消息发送至选定的S-GW。请求类型被设置为具有永久在线的S1-U承载的请求类型。这通知S-GW：已经创建了永久在线的承载，并且当UE进入空闲模式时将保留上下文。可以以如下两种方式中的一种来指派由S-GW在S1-U接口上使用的TEID(被称为“S-GW TEID”)：1)如果永久在线的承载仅被支持用于低移动性UE，则按照通常的方式指派S-GW TEID，即，使得其值在给定的S1-U接口上是唯一的；或者，2)如果结合UE移动性来支持永久在线的承载，则按照使其值在由相同S-GW服务的所有S1接口上是唯一的这种方式来指派S-GW TEID。如下所阐释的，S-GW TEID指派的所述特殊方式使SGW能够识别用于具体用户平面分组的永久在线的承载，不考虑接收该用户平面分组的S1实例。
在一些实施例中，还通知UE S-GW TEID和S-GW IP地址。只有在结合UE移动性来支持永久在线的承载时才可能需要所述通知。将与S1永久在线的承载有关的一些信息(即，被指派给永久在线的承载的SGW IP地址和SGW TEID)经由AS(接入层)或者NAS信令通过信号发送至UE。例如，RRC连接重配置消息可以用于将S-GW TEID和S-GW IP地址附带至UE，或者，可替代的，该信息可以由MME附带在附着接受消息中。UE存储该信息，并且当UE从空闲模式变为连接模式时将该信息传递至eNB。然后eNB使用该信息来识别并且连接至“拥有”永久在线的S1-U承载的S-GW。UE存储该信息是很重要的，这是因为如果UE是移动的，则已经保留了UE上下文的eNB可能会改变(但新eNB可能仍具有相同的S-GW)。
图4示出了根据由阶段1到26组成的一个实施例的用于获得永久在线的S1-U承载的增强型附着过程。在阶段1中，UE将附着请求消息发送至具有所请求的永久在线的承载的eNB，所请求的永久在线的承载在阶段2中被转发至MME。永久在线的S1-U承载可以由eNB通过设置附着类型而进行请求。在阶段3和阶段4，身份请求和身份响应消息在UE与MME之间发送。认证/安全、身份检测、以及加密的选项过程在阶段5a～阶段5b和阶段6进行。在阶段7和阶段8中，MME将删除会话请求消息发送至P-GW，并且继而接收删除会话响应消息，以便拆除先前的承载。在阶段9和阶段10中，MME将更新位置请求消息发送至HSS，并且继而接收更新位置响应，从而在阶段11中MME可以使用HSS信息来对永久在线的S1-U承载的请求进行验证。在阶段12中，MME将创建会话请求消息发送至S-GW，其中，将请求类型设置为永久在线的S1-U承载，并且在阶段13中将该消息转发至P-GW。在阶段14中，创建会话响应消息由S-GW接收，连同在阶段15中由S-GW接收下行链路数据(如果尚未发生移交)，并且在阶段16中将该响应转发至MME。然后在阶段17中，MME将初始上下文设立请求和附着接受消息发送至eNB。在阶段18中，eNB将RRC连接重配置消息发送至UE，该消息也通知UE用于永久在线的承载的S-GW IP地址和S-GW TEID。在阶段19中，UE将RRC重配置完成消息发送至eNB。在阶段20，eNB将初始上下文设立完成消息发送至MME，并且在阶段22中将附着完成消息发送至MME。在阶段21中，UE将直接传输消息发送至eNB。在阶段23，MME将修改承载请求消息发送至S-GW，所述修改承载请求消息被转发至P-GW。在阶段24中，P-GW将修改请求响应消息发送至S-GW，所述修改请求响应消息被转发至MME。在阶段25和阶段26中，在MME与HSS之间交换通报请求和通报响应消息。
对S1释放过程的增强
图5示出了(在S1-MME上)仅释放逻辑S1-AP信令连接的增强型S1释放过程的示例。在阶段1中，在eNB处的用户不活动定时器到期，发起该过程。在阶段2和阶段3中，分别由eNB和S-GW保留UE上下文信息。在阶段5，eNB向UE发送RRC连接释放消息。在该过程完成之后，UE从ECM-连接状态移至ECM-空闲状态。正如在上面所描述的附着过程期间将永久在线的S1-U承载通知给eNB、MME和S-GW，在eNB、MME和S-GW处保留与UE相关的上下文信息。
在一个实施例中，如图6所示出的，在阶段601，当在eNB处用户不活动定时器到期时，其在阶段602中，检查建立的承载是否为永久在线的S1-U承载。如果是，那么在阶段603中，eNB保留UE上下文信息，而S-GW还保留配置细节连同映射到S5/S8承载的映射细节。另外，在阶段604中，其遵循如在3GPP TS 23.401的5.3.5章节中所描述的正常释放过程。
将RRC连接释放消息发送至UE，以便释放在UE与eNB之间的RRC连接。在已经发生了移交并且已经利用S-GW重定位改变了eNB的情况下，然后eNB可以使用RRC连接释放消息来附带新S-GW IP地址和S-GW TEID。在不需要任何MME信令的情况下，UE保留了S-GW TEID和S-GW IP地址，并且将该信息在服务请求消息中提供给eNB，从而连接至永久在线的承载。
利用S-GW重定位的增强型追踪区更新过程
图7示出了根据一个实施例的增强型追踪区更新过程。在阶段1和阶段3中执行了TAU(追踪区更新)过程。当追踪区更新随着S-GW改变而发生时，然后在阶段2中新S-GW将创建会话响应消息发送至新MME，该创建会话响应消息包括用于用户平面的新S-GW地址和新S-GW TEID以及用于上行链路业务的(用于S5/S8的)P-GW TEID。这需要被传送到UE，使得S-GW TEID和IP地址在UE处被更新，从而有助于连接至永久在线的隧道。在将该地址通知给UE之前，首先删除旧会话。在阶段4中，旧MME向旧S-GW发送删除会话请求消息，并且在阶段5中接收删除会话响应。然后在阶段6中，通过跟踪区更新接受消息附带并且发送新S-GW IP地址和S-GW TEID。在阶段7中，UE获得新S-GW IP地址和S-GW TEID，并且在阶段8中向新MME发送跟踪区更新完成消息。
用于永久在线的S1-U承载的增强型服务请求过程
当使用了永久在线的承载时，可以使用修改的服务请求过程，以便在UE进入连接模式时附着至网络。由图8示出了根据一个实施例的节省S1-MME信令的增强型服务请求过程的示例。在阶段1中，在遵循用于如上所描述的永久在线的隧道的S1-释放过程之后，UE处于空闲模式。在阶段4中，当UE处于ECM-空闲状态时，UE发起服务请求。当UE必须从EMM_空闲模式变为EMM_注册模式时，将NAS服务请求消息从UE发送至eNB。当存在下行链路数据或者当存在UE发起的上行链路数据时，当由MME寻呼UE时，发送该消息。在阶段3中，UE将封装在RRC消息中的NAS消息服务请求发送至eNB。如果UE使用永久在线的S1-U承载，则UE将附带在该消息中的S-GW TEID和S-GW IP地址发送至eNB。此外，如果已经执行了TAU，则将新S-GWTEID、S-GW地址发送至eNB，从而更新永久在线的EPS承载信息并且连接至S1-U。在阶段4中，eNB接收S-GW IP地址和S-GW TEID，并且将无线承载映射到S1-U承载。在阶段5中，eNB对UE进行认证，并且执行与安全性相关的功能。在阶段6中，在UE与eNB之间建立无线承载。在阶段7a和阶段7b中，eNB使用静态S-GW TEID和S-GW地址来连接至S1-U承载。在阶段7c中，eNB发送假UL数据，以将DL eNB TEID通知给S-GW。这可以通过从GTP-U报头定义新“消息类型”来完成，或者，可以修改现有的消息，例如Echo请求。在阶段7d和阶段7e中，将s5/S8的上下文维持在S-GW处，并且将S1-U映射到S5/S8。在阶段8中，建立端到端隧道，并且，使用在上行链路期间发送的eNB TEID，将下行链路数据路由至S-GW和UE。
图9示出了根据一个实施例的从eNB/MME进行寻呼得到下行链路数据。在阶段901中，当PDN网关将下行链路分组发送至UE时，首先在S-GW处对分组进行缓冲。在阶段902，在初始附着期间，通知S-GW：S1-U承载为永久在线的，并且S-GW确定情况就是如此。在知道S1-U承载为永久在线的承载之后，在阶段903中，S-GW将分组发送至eNB，无论UE处于空闲模式还是连接模式。在阶段904中，eNB确定UE处于连接模式或者是空闲模式。在阶段905中，如果UE处于连接模式，则发送分组。如果在阶段906中，UE处于空闲模式，则eNB使用UE的IMSI(国际移动订户标识)信息在其最后注册的小区中寻呼UE，并且设置适当的寻呼原因。在阶段907，如果UE仍注册到所述eNB，则UE接收分组。在阶段908中，如果UE不响应，则eNB经由新GTP-U消息或者经由修改的现有消息(例如，Echo请求)通知S-GW：消息传送失败。随后，在阶段909中，S-GW通过寻呼UE来请求MME传送所述消息。在阶段910中，在接收到该请求之后，MME寻呼在UE的跟踪区列表中的所有eNB，以及在阶段911中，UE所附着的eNB寻呼UE，以发起服务请求。任选地，可以执行阶段912，从而检查UE处于高移动性状态还是低移动性状态。如果处于低移动性状态，则eNB可以寻呼UE，从而通知UE发起服务请求。在另一方面，如果UE是高移动性的，则S-GW可以发送消息至MME，从而寻呼UE而不是要求eNB寻呼UE。一旦将下行链路数据通知给UE，UE便发起上面所描述的增强型服务请求过程，从而注册到网络并且接收服务。
在另一实施例中，S-GW运行不活动定时器，所述不活动定时器的值与eNB不活动定时器的值相比相同或者更小。如果定时器到期，则S-GW将UE标记为空闲。在这种情况下，如果S-GW接收到任何下行链路数据，则S-GW不会将下行链路数据转发至eNB，而会将下行链路数据通知发送给MME。
利用S-GW重定位的用于eNB重定位的增强型呼叫流
当eNB重定位随着S-GW重定位发生时，必须在S-GW、eNB和P-GW处更新上下文，以便有助于永久在线的S1-U承载。由图10示出了根据一个实施例的该过程所涉及的阶段的示例实施例。在阶段1中，在接收到路径切换请求之后，在阶段2中，MME利用承载上下文将创建会话请求消息发送至目标S-GW。该消息包括：已经由目标eNB接受的默认承载的每PDN连接接受的EPS承载的下行链路用户平面的P-GW地址、S5/S8的TEID、eNB地址和TEID。在阶段3a中，目标S-GW将修改承载请求发送至P-GW，并且继而在阶段3b中接收修改承载响应。在阶段4中，目标S-GW向MME发送创建会话响应消息。在阶段5中，MME向目标eNB发送路径切换请求确认消息，该消息为eNB给出用于用户平面消息的S-GW地址和上行链路TEID。阶段6和阶段7a-阶段7b示出了由目标eNB发送至源eNB的释放资源消息和由MME发送至源S-GW的删除会话请求，继而发送删除会话响应。在阶段8处，执行追踪区更新过程。目标eNB开始使用用于转发随后的上行链路分组的新S-GW地址和TEID。通过将该信息附带在如上所阐释的RRC连接释放消息中，在S-1释放之前(在UE进入空闲模式之前)，将新S-GW TEID和S-GW IP地址通知给UE。当UE从空闲模式进入连接模式时，UE可以在不需要任何信令的情况下，使用新S-GW信息并且在服务请求消息中将新S-GW信息应用到eNB，从而连接至永久在线的承载。用于传送UE和安全上下文的解决方案
当如上所描述地执行增强型服务请求过程，以便连接至永久在线的承载时，UE从空闲模式进入连接模式。如果UE在处于空闲模式时已经改变了其eNB并且连接至新eNB，那么必须将UE的安全上下文从旧eNB传输至新eNB。下面描述的是当UE的eNB已经改变时，将UE的安全上下文从旧eNB传输至新eNB的方案。
一个实施例如下。对于具有低移动性的用户，如果eNB不经常改变，那么可以如3GPP TS.23.401的5.3.4章节中所描述的来执行正常服务请求过程。然而，新eNB应该向旧eNB发送上下文释放请求，从而通知旧eNB释放属于UE的上下文。UE可以在NAS服务请求中向eNB指示UE具有低移动性状态。在接收到低移动性指示时，新eNB使用ECGI(E-UTRAN小区全球标识符)和旧eNB IP地址来建立与旧eNB的X2连接，并且发送UE上下文释放消息。可以增强现有的UE上下文释放消息，以便通知旧eNB释放资源。在X2接口上创建新消息，即UE上下文释放回复，该消息用于将成功/失败通知给新eNB。一旦新eNB接收到对UE上下文删除的确认，则正常服务请求过程继续。可替代的，一旦利用新eNB建立了S1-U，则可以由S-GW释放在旧eNB中的上下文。
在图11中示出了另一实施例。在该方案中，UE使用X2接口将安全上下文从旧eNB传输至新eNB。在UE从连接模式进入空闲模式之前，UE获得有关其最后所连接的eNB的信息。在阶段1和阶段2，UE获得在RRC连接释放消息中附带的eNB的ECGI和IP地址。在UE进入空闲模式之后，UE然后可以是移动的并且可以改变eNB。当在阶段3中UE发起服务请求或者存在发起服务请求的网络时，在阶段4，UE连接至新eNB并且将其上一次的eNB信息附带在NAS服务请求中给新eNB。在阶段5中，通过比较由UE发送的ECGI和自己的ECGI，新eNB检查在处于空闲模式时UE是否已经改变了eNB。在阶段6中，如果ECGI不同，那么eNB使用上一个eNB的IP地址信息，并且与它建立X2连接。在阶段7中，对请求安全上下文X2消息进行定义，以便请求旧eNB将相关的安全上下文移交至属于UE的新eNB。同样，在阶段8中，对安全上下文响应消息进行定义，以便在X2接口上将安全上下文从旧eNB携带至新eNB。一旦新eNB从UE所附着的上一个eNB接收安全上下文，它便执行针对UE来建立安全上下文，并且呼叫流继续，例如从图8所示出的增强型服务请求过程中的阶段6继续。
在另一实施例中，配置传输过程用于经由MME将在旧eNB处的安全上下文传输至新eNB。当UE发起服务请求过程时，UE向新eNB发送UE上一次所连接的eNB的ECGI。这通过在NAS服务请求上附带上一次eNB信息而完成。eNB比较该ECGI信息和自己的ECGI信息，并且检查UE是否已经改变了eNB。如果是，则新eNB发起如图12所示的配置传输过程。在阶段1中，新eNB向MME发送具有SON(自组织网络)配置传输IE和SON信息请求IE的eNB配置传输消息。在阶段2中，MME将该消息透明地转发至目标eNB-ID IE中指示的eNB，目标eNB-ID IE包括在SON配置传输IE中。在阶段3和阶段4中，在接收到包含SON信息请求IE的SON信息IE时，旧eNB通过发起eNB配置传输过程，将请求的信息传输回在SON配置传输IE的源eNB-ID IE中指示的eNB。对配置传输消息进行增强，以便从旧eNB请求安全上下文。在本实施例中，如图12所描绘的经由MME的上下文传输可以替代图11中的阶段6到阶段8。
附加的注释和示例
在示例1中，一种用于在LTE(长期演进)网络中工作的演进型节点B(eNB)，其包括：处理电路系统；用于与用户设备(UE)进行通信的无线接口；用于与移动管理实体(MME)进行通信的S1-MME网络接口；用于与服务网关(S-GW)进行通信的S1-U网络接口；其中，当从UE接收到永久在线的S1-U承载的请求时，处理电路系统指示MME向UE提供随着UE在RRC_连接状态与RRC_空闲状态之间移动而持续的S1-U承载，并且在S1释放过程期间或者另外当UE进入到RRC_空闲状态或者ECM_空闲状态时保留UE上下文信息。
在示例2中，示例1的主题可以可选地包括：其中，处理电路系统用于：经由其中包含有永久在线指示符的RRC连接请求消息从UE接收永久在线的S1-U承载的请求。
在示例3中，示例2的主题可以可选地包括：其中，在RRC连接请求消息中的永久在线指示符是移动发起接入或者移动终止接入二者中的一个的建立原因。
在示例4中，示例1的主题可以可选地包括：其中，处理电路系统用于：通过在S1-AP初始UE消息中将包含永久在线指示符的RRC连接请求消息的建立原因转发至MME来通知MME永久在线的S1-U承载的请求。
在示例5中，示例1的主题可以可选地包括：其中，处理电路系统用于：通过使用从UE发送至eNB，并且因此发送至MME的非接入层(NAS)消息来通知MME永久在线的S1-U承载的请求。
在示例6中，示例5的主题可以可选地包括：其中，处理电路系统用于：通过从UE转发附着请求消息来通知MME永久在线的S1-U承载请求，其中，在附着请求消息的EPS附着类型字段中包含永久在线指示符。
在示例7中，示例5的主题可以可选地包括：其中，处理电路系统用于：通过从UE转发附着请求消息来通知MME永久在线的S1-U承载请求，其中，在附着请求消息的更新类型字段中包含永久在线指示符。
在示例8中，示例5的主题可以可选地包括：其中，处理电路系统用于：通过从UE转发附着请求消息来通知MME永久在线的S1-U承载请求，其中，在附着请求消息的单独的信息单元(IE)中包含永久在线指示符。
在示例9中，示例5的主题可以可选地包括：其中，处理电路系统用于：通过从UE转发包含永久在线指示符的服务请求消息来通知MME永久在线的S1-U承载请求。
在示例10中，示例5的主题可以可选地包括：其中，处理电路系统用于：通过从UE转发包含永久在线指示符的跟踪区更新请求消息来通知MME永久在线的S1-U承载请求。
在示例11中，示例1的主题可以可选地包括：其中，处理电路系统用于：在响应于由UE所发送的附着请求而从MME接收附着接受消息之后，向UE转发附着接受消息，其中，所述附着接受消息包括向永久在线的S1-U承载分配的、选定的S-GW的IP(互联网协议)地址和S-GW TEID(隧道端点标识符)。
在示例12中，示例1的主题可以可选地包括：其中，处理电路系统用于：在响应于由UE所发送的附着请求而从MME接收附着接受消息之后，将RRC连接重配置消息发送至UE，其中，所述RRC连接重配置消息中包括向永久在线的S1-U承载分配的、选定的S-GW的IP(互联网协议)地址和S-GW TEID(隧道端点标识符)。
在示例13中，示例1的主题可以可选地包括：其中，处理电路系统用于：在用于特定UE的用户不活动定时器到期时，检查用于特定UE的S1-U承载是否为永久在线的承载，并且如果是，则在保持特定UE的上下文的同时发起S1释放过程。
在示例14中，示例13的主题可以可选地包括：其中，处理电路系统用于：在发起针对具有永久在线的S1-U承载的UE的S1释放之后，如果已经发生移交从而使得利用S-GW重定位将UE分配给新eNB，则在RRC连接释放消息中嵌入向永久在线的S1-U承载分配的、新S-GWIP地址和S-GW TEID。
在示例15中，示例1的主题可以可选地包括：其中，处理电路系统用于：当针对具有永久在线的S1-U承载的UE而发生具有S-GW变化的追踪区更新过程时，将跟踪区更新请求消息连同向永久在线的S1-U承载分配的、新的S-GW IP地址和S-GW TEID一起从MME转发至UE。
在示例16中，示例1的主题可以可选地包括：其中，处理电路系统用于：在从具有S1-U承载的UE接收NAS服务请求消息连同向永久在线的S1-U承载分配的、S-GW IP地址和S-GW TEID之后，将永久在线的S1-U承载映射到UE的无线承载。
在示例17中，示例16的主题可以可选地包括：其中，处理电路系统用于：在将永久在线的S1-U承载映射到UE的无线承载之后，连接至永久在线的S1-U承载并且将数据发射至S-GW，从而通知S-GW：DL(下行链路)eNB TEID。
在示例18中，示例1的主题可以可选地包括：其中，处理电路系统用于：如果已经发生移交使得将具有永久在线的S1-U承载的UE新分配给eNB，则将路径切换请求消息发送至UE的MME，并且在路径切换请求确认消息中从MME获取被分配给永久在线的S1-U承载的新S-GW IP地址和S-GW TEID。
在示例19中，示例1的主题可以可选地进一步包括：用于与另一eNB进行通信的X2网络接口；其中，处理电路系统用于：在从具有永久在线的S1-U承载的UE接收NAS服务请求消息连同被分配给永久在线的S1-U承载的S-GW IP地址、S-GW TEID、上一个eNB IP地址和上一个eNB ECGI(E-UTRAN小区全球标识符)之后，而如果UE的eNB已经改变并且已经从UE接收到低移动性指示，则将增强型UE上下文释放消息发送至UE的上一个eNB，增强型UE上下文释放消息通知上一个eNB释放与永久在线的S1-U承载相关联的资源；与UE重建安全的上下文。
在示例20中，示例1的主题可以可选地进一步包括：用于与另一eNB进行通信的X2网络接口；其中，处理电路系统用于：在从具有永久在线的S1-U承载的UE接收NAS服务请求消息连同被分配给永久在线的S1-U承载的S-GW IP地址、S-GW TEID、上一个eNB IP地址和上一个eNB ECGI(E-UTRAN小区全球标识符)之后，而如果UE的eNB已经改变，则将请求安全上下文消息发送给上一个eNB，以便请求上一个eNB传输UE的安全上下文；以及，从上一个eNB接收包括UE的安全上下文的安全上下文响应消息。
在示例21中，示例1的主题可以可选地进一步包括：用于与另一eNB进行通信的X2网络接口；其中，处理电路系统用于：在从具有永久在线的S1-U承载的UE接收NAS服务请求消息连同被分配给永久在线的S1-U承载的S-GW IP地址、S-GW TEID、上一个eNB IP地址和上一个eNB ECGI(E-UTRAN小区全球标识符)之后，而如果UE的eNB改变：则向UE的MME发送具有SON(自组织网络)配置传输IE和SON信息请求IE的增强的eNB配置传送消息，以用于转发至正如包括在SON配置传输IE中的目标eNB-ID IE所指示的上一个eNB；以及从包括UE的安全上下文的上一个eNB接收由增强的eNB配置传送消息所请求的信息。
在示例22中，一种用于在LTE(长期演进)网络中工作的移动管理实体(MME)，其包括：处理电路系统；用于与演进型节点B(eNB)进行通信的S1-MME网络接口；用于与服务网关(S-GW)进行通信的S11网络接口；其中，处理电路系统用于：当由eNB从UE(用户设备)转发永久在线的S1-U承载的请求时，建立随着UE在RRC_连接状态与RRC_空闲状态之间移动而持续的用于UE的永久在线的S1-U承载，并且在S1释放过程期间或者另外当UE进入RRC_空闲状态或者ECM_空闲状态时保留UE上下文信息。
在示例23中，示例22的主题可以可选地包括：其中，处理电路系统用于：通过将创建会话请求消息发送至选定的S-GW来建立永久在线的S1-U承载，其中将请求类型设置为永久在线的S1-U承载，然后创建会话请求消息被转发至P-GW(分组数据网络网关)，以便设立默认的EPS(演进分组系统)承载。
在示例24中，示例23的主题可以可选地进一步包括：用于与HSS(归属用户服务器)进行通信的S6a网络接口，以及其中，处理电路系统用于：在发送创建会话请求消息以建立永久在线的S1-U承载之前，通过利用HSS来验证UE的订户数据，从而确认对永久在线的S1-U承载的需要。
在示例25中，示例23的主题可以可选地包括：其中，处理电路系统用于：响应于创建会话请求消息而从P-GW接收由S-GW所转发的创建会话响应消息，并且将如由eNB所转发的附着接受消息发送至UE，以通知UE：被分配给永久在线的S1-U承载的选定的S-GW的IP(互联网协议)地址和S-GW TEID(隧道端点标识符)。
在示例26中，示例23的主题可以可选地包括：其中，处理电路系统用于：当至新eNB和新S-GW的eNB和S-GW重定位发生时，并且在从新eNB接收路径切换请求消息之后，将创建会话请求消息发送至新S-GW，创建会话请求消息更新了已经由新eNB所接受的默认承载的承载上下文；从新S-GW接收创建会话响应消息；以及将路径切换请求确认消息发送至新eNB，所述路径切换请求确认消息包含被分配给永久在线的S1-U承载的S-GW的IP地址和S-GW TEID(隧道端点标识符)的更新。
在示例27中，一种用于在LTE(长期演进)网络中工作的服务网关(S-GW)，其包括：处理电路系统；用于与演进型节点B(eNB)进行通信的S1-U网络接口；用于与移动管理实体(MME)进行通信的S11网络接口；其中，处理电路系统用于：当从MME接收到将请求类型设置为永久在线的S1-U承载的创建会话请求消息时，设立具有用于UE的永久在线的S1-U承载的默认EPS承载，所述用于UE的永久在线的S1-U承载在S1释放过程期间或者另外当所述UE进入RRC_空闲状态或者ECM_空闲状态时持续。
在示例28中，示例27的主题可以可选地包括：其中，处理电路系统用于：如果UE不处于高移动性状态，则分配用于永久在线的S1-U承载的S-GW TEID(隧道端点标识符)，从而使其值对于用于永久在线的S1-U承载的S1-U接口而言是唯一的。
在示例29中，示例27的主题可以可选地包括：其中，处理电路系统用于：如果UE处于高移动性状态，则分配用于永久在线的S1-U承载的S-GW TEID(隧道端点标识符)，从而使其值对于由S-GW服务的所有S1-U接口而言是唯一的。
在示例30中，示例27的主题可以可选地包括：其中，处理电路系统用于：运行不活动定时器，所述不活动定时器的值与由eNB所使用的不活动定时器的值相同或者比更其小；以及，如果S-GW的不活动定时器到期，则将UE标记为空闲，并且如果接收到UE的下行链路数据，则将下行链路数据通知发送至MME。
在示例31中，一种用于在LTE(长期演进)网络中工作的UE(用户设备)，其包括：无线收发机，其提供用于与eNB(演进型节点B)进行通信的空中接口；以及连接至无线收发机的处理电路系统，如果应用利用小的数据传输运行从而使得在RRC_连接状态与RRC_空闲状态之间的转变数量超出具体的阈值，则处理电路系统将请求随着UE在RRC_连接状态与RRC_空闲状态之间移动而持续的永久在线的S1-U承载的消息发送至eNB。
在示例32中，示例31的主题可以可选地包括：其中，处理电路系统用于：经由RRC连接请求消息从UE发送永久在线的S1-U承载的请求，其中，在永久在线的S1-U承载请求中包含有永久在线指示符。
在示例33中，示例31的主题可以可选地包括：其中，处理电路系统用于：经由非接入层(NAS)消息将永久在线的S1-U承载的请求发送至eNB。
示例34是一种用于实施由在示例1到示例33的任何示例中的处理电路系统执行的功能的方法。
在示例35中，一种机器可读介质包含指令，当执行所述指令时，机器可读介质使机器实施由如示例1到示例33的任何示例所列举的处理电路系统所执行的功能。
在示例36中，一种系统，其包括用于实施由如示例1到示例33的任何示例所列举的处理电路系统所执行的功能的模块。
上面的具体实施方式包括对附图的参考，这些附图形成了具体实施方式的一部分。作为举例示出，这些附图示出了可以实践的具体实施例。这些实施例在本文中也被称为“示例”。这样的示例可以包括除了所示出或者描述的元件之外的元件。然而，同样设想了包括示出或者描述的元件的示例。而且，相对于特定示例(或者，其一个或者多个方面)，或者相对于本文所示出或者描述的其他示例(或者，其一个或者多个方面)，同样设想了使用示出或者描述的这些元件(或者，其一个或者多个方面)的任何组合或者置换的示例。
本文所参考的出版物、专利和专利文件的全部内容以引用的方式并入本文，如同以引用的方式单独并入本文中一样。在本文件和以引用的方式并入本文中的这些文件之间的使用出现不一致的事件中，对所并入的引用的使用是对本文件的使用的补充；对于不可调和的不一致性，以本文件中的使用为准。
在本文件中，术语“一”或者“一个”，如在专利文件中通常使用的，用于包括一个或者一个以上，其独立于任何其他实例或者“至少一个”或者“一个或者多个”的使用。在本文件中，术语“或者”用于表示非排他性的，或者使得“A或者B”包括“A，但不是B”、“B，但不是A”、以及“A和B”，除非另有其他说明。在所附的权利要求书中，术语“包括”和“其中”用作相应术语“包含”和“在其中”的简明英语等效物。同样，在以下的权利要求书中，术语“包括”和“其中”是开放性的，即，包括除了在权利要求项中这样的术语之后列举出来的元件之外的元件的系统、装置、物品或者过程仍然被视为落入该权利要求项的范围内。而且，在以下的权利要求书中，术语“第一”、“第二”和“第三”等仅用作标签，而并不是要暗示它们的物体的数字顺序。
如上所描述的实施例可以在各种硬件配置中实现，所述硬件配置可以包括用于执行完成所描述的技术的指令的处理器。这样的指令可以包含在机器可读介质中，所述机器可读介质例如是适当的存储介质或者存储器或者其他处理器可执行介质。
如本文所描述的实施例可以在许多环境下实现，许多环境例如是以下环境的一部分：无线局域网(WLAN)、第三代合作伙伴计划(3GPP)通用陆地无线接入网(UTRAN)、或者长期演进(LTE)或者长期演进(LTE)通信系统，但是本发明的范围不限于所述方面。示例LTE系统包括由LTE规范定义为用户设备(UE)的大量的移动站，所述移动站与由LTE规范定义为eNode-B的基站进行通信。
本文所提到的天线可以包括一个或者多个定向或者全向天线，包括：例如，偶极天线、单极天线、贴片天线、环形天线、微带天线或者适用于RF信号传输的其他类型的天线。在一些实施例中，可以使用具有多个孔径的单个天线而不是两个或者两个以上的天线。在这些实施例中，可以将每一个孔径作为单独的天线。在一些多输入多输出(MIMO)实施例中，可以有效地隔开天线，从而利用可能在每一个天线与发射站的天线之间引起的空间分集和不同的信道特性。在一些MIMO实施例中，天线可以由多达1/10的波长或者更大的波长来进行分隔。
在一些实施例中，如本文所描述的接收机可以被配置为：根据具体的通信标准来接收信号，具体的通信标准例如是，电气与电子工程师协会(IEEE)标准，包括：IEEE802.11-2007和/或802.11(n)标准和/或针对WLAN提出的规范，但是本发明的范围不限于所述方面，这是因为它们还可以适用于根据其他技术和标准来发射和/或接收通信。在一些实施例中，接收机可以被配置为：根据以下标准来接收信号：用于无线城域网(WMAN)的包括其变型和演进在内的IEEE 802.16-2004、IEEE 802.16(e)和/或IEEE802.16(m)标准，但是本发明的范围不限于所述方面，这是因为它们还可以适用于根据其他技术和标准来发射和/或接收通信。在一些实施例中，接收机可以被配置为：根据通用陆地无线接入网(UTRAN)LTE通信标准来接收信号。针对有关IEEE 802.11和IEEE 802.16标准的更多信息，请参考2005年5月的“用于系统之间的信息技术-电信与信息交换的IEEE标准”-局域网-具体要求-第11部分“无线LAN介质访问控制(MAC)和物理层(PHY)，ISO/IEC 8802-11:1999”和城域网-具体要求-第16部分“用于固定宽带无线接入系统的空中接口”和相关的修正/版本。针对关于UTRAN LTE标准的更多信息，见2008年3月发布的用于UTRAN-LTE版本8的第三代合作伙伴计划(3GPP)标准，包括其变型和演进。
上面的说明是举例示出性的，而非限制性的。例如，上述的示例(或者，其一个或者多个方面)可以彼此组合使用。例如本领域中的普通技术人员在阅读了上述说明之后，可以使用其他实施例。摘要用于使读者能够快速地确定本技术公开的实质，例如，以遵从美国37C.F.R.§1.72(b)。基于以下理解来提交本摘要：其不用于解释或限制权利要求的范围或含义。同样，在上述的具体实施方式中，各种特征可以组合在一起以组织本公开。然而，权利要求书可能并未阐述本文所公开的每一项特征，因为实施例可能以所述特征的子集为特征。进一步地，实施例可以包括比特定示例中公开的特征更少的特征。由此，以下权利要求书据此被并入到具体实施方式中，每个权利要求项自身均作为单独的实施例。本文所公开的实施例的范围连同这些权利要求项所拥有的等效物的整个范围参考随附的权利要求来进行确定。

Claims (32)

1.一种用于在LTE(长期演进)网络中操作的演进型节点B(eNB)，其包括：
处理电路；
用于与用户设备(UE)进行通信的无线接口；
用于与移动管理实体(MME)进行通信的S1-MME网络接口；
用于与服务网关(S-GW)进行通信的S1-U网络接口；
其中，所述处理电路用于：
经由RRC连接请求消息从所述UE接收针对永久在线的S1-U承载的请求，其中，所述RRC连接请求消息中包括永久在线指示符；
当从所述UE接收到针对所述永久在线的S1-U承载的所述请求时，指示所述MME向所述UE提供随着所述UE在RRC_连接状态与RRC_空闲状态之间移动而持续的S1-U承载，并且在S1释放过程期间或者另外当所述UE进入到RRC_空闲状态或者ECM_空闲状态时保留UE上下文信息。
2.根据权利要求1所述的eNB，其中，在所述RRC连接请求消息中的所述永久在线指示符是移动发起接入或者移动终止接入的建立原因。
3.根据权利要求2所述的eNB，其中，所述处理电路用于：通过在S1-AP初始UE消息中将包含有所述永久在线指示符的所述RRC连接请求消息的所述建立原因转发到所述MME，来通知所述MME针对所述永久在线的S1-U承载的所述请求。
4.根据权利要求1所述的eNB，其中，所述处理电路用于：通过使用从所述UE发送至所述eNB、再从所述eNB发送至所述MME的非接入层(NAS)消息来通知所述MME针对所述永久在线的S1-U承载的所述请求。
5.根据权利要求4所述的eNB，其中，所述处理电路用于：通过从所述UE转发在附着请求消息中的EPS附着类型字段中包含有所述永久在线指示符的所述附着请求消息，来通知所述MME所述永久在线的S1-U承载的所述请求。
6.根据权利要求4所述的eNB，其中，所述处理电路用于：通过从所述UE转发附着请求消息，来通知所述MME针对所述永久在线的S1-U承载的所述请求，其中所述附着请求消息中的更新类型字段中包括所述永久在线指示符。
7.根据权利要求4所述的eNB，其中，所述处理电路用于：通过从所述UE转发附着请求消息来通知所述MME针对所述永久在线的S1-U承载的所述请求，其中所述附着请求消息的单独信息单元(IE)中包括所述永久在线指示符。
8.根据权利要求4所述的eNB，其中，所述处理电路用于：通过从所述UE转发包含有所述永久在线指示符的服务请求消息来通知所述MME针对所述永久在线的S1-U承载的所述请求。
9.根据权利要求4所述的eNB，其中，所述处理电路用于：通过从所述UE转发包含有所述永久在线指示符的跟踪区域更新请求消息来通知所述MME针对所述永久在线的S1-U承载的所述请求。
10.根据权利要求1所述的eNB，其中，所述处理电路用于：在响应于由所述UE发送的附着请求从所述MME接收附着接受消息之后，将所述附着接受消息转发至所述UE，其中，向所述永久在线的S1-U承载分配的、选定的S-GW的IP(互联网协议)地址和S-GW TEID(隧道端点标识符)均包含在所述附着接受消息中。
11.根据权利要求1所述的eNB，其中，所述处理电路用于：在响应于由所述UE发送的附着请求，从所述MME接收所述附着接受消息之后，将RRC连接重配置消息发送至所述UE，其中，所述RRC连接重配置消息中包括向所述永久在线的S1-U承载分配的、选定的S-GW的IP(互联网协议)地址和S-GW TEID(隧道端点标识符)。
12.根据权利要求1所述的eNB，其中，所述处理电路用于：在用于特定的UE的用户不活动定时器到期之后，检查用于所述特定UE的S1-U承载是否为永久在线的承载，并且如果是，则在保持所述特定UE的上下文的同时发起S1释放过程。
13.根据权利要求12所述的eNB，其中，所述处理电路用于：在发起针对具有永久在线的S1-U承载的UE的S1释放之后，如果已经发生移交而使得已经利用S-GW重定位将所述UE分配给的新eNB，则在RRC连接释放消息中嵌入向所述永久在线的S1-U承载分配的、新的S-GW IP地址和S-GW TEID。
14.根据权利要求13所述的eNB，其中，所述处理电路用于：当具有S-GW变化的跟踪区更新过程针对具有永久在线的S1-U承载的UE而发生时，将跟踪区更新接受消息连同向所述永久在线的S1-U承载分配的、所述新的S-GW IP地址和S-GW TEID一起从所述MME转发至所述UE。
15.根据权利要求1所述的eNB，其中，所述处理电路用于：在从具有永久在线的S1-U承载的UE接收NAS服务请求消息连同向所述永久在线的S1-U承载分配的、S-GW IP地址和S-GWTEID之后，将所述永久在线的S1-U承载映射到所述UE的无线承载。
16.根据权利要求15所述的eNB，其中，所述处理电路用于：在将所述永久在线的S1-U承载映射到所述UE的所述无线承载之后，连接至所述永久在线的S1-U承载，并且将数据发射至所述S-GW，从而通知所述S-GW：DL(下行链路)eNB TEID。
17.根据权利要求1所述的eNB，其中，所述处理电路用于：如果已经发生移交使得具有永久在线的S1-U承载的UE被新分配给所述eNB，则将路径切换请求消息发送至所述UE的MME，并且在路径切换请求确认消息中从所述MME获取向所述永久在线的S1-U承载分配的、新的S-GW IP地址和S-GW TEID。
18.根据权利要求1所述的eNB，其进一步包括：
用于与另一eNB通信的X2网络接口；
其中，所述处理电路用于：在从具有永久在线的S1-U承载的UE接收NAS服务请求消息连同上一个eNB IP地址、上一个eNB ECGI(E-UTRAN小区全球标识符)、以及向所述永久在线的S1-U承载分配的S-GW IP地址、S-GW TEID之后，并且如果所述UE的eNB已经改变，而且已经从所述UE接收到低移动性指示，则：
将增强型UE上下文释放消息发送至所述UE的上一个eNB，通知所述上一个eNB释放与所述永久在线的S1-U承载相关联的资源；以及
与所述UE重建安全的上下文。
19.根据权利要求1所述的eNB，其进一步包括：
用于与另一eNB进行通信的X2网络接口；
其中，所述处理电路用于：
在从具有永久在线的S1-U承载的UE接收NAS服务请求消息连同上一个eNB IP地址、上一个eNB ECGI(E-UTRAN小区全球标识符)、以及向所述永久在线的S1-U承载分配的S-GW IP地址、S-GW TEID之后，如果所述UE的eNB已经改变，则：
将请求安全上下文消息发送至所述上一个eNB，以便请求所述上一个eNB传输所述UE的安全上下文；以及，
从包括所述UE的安全上下文的所述上一个eNB接收安全上下文响应消息。
20.根据权利要求1所述的eNB，其进一步包括：
用于与另一eNB进行通信的X2网络接口；
其中，所述处理电路用于：
在从具有永久在线的S1-U承载的UE接收NAS服务请求消息连同上一个eNB IP地址、上一个eNB ECGI(E-UTRAN小区全球标识符)、以及向所述永久在线的S1-U承载分配的S-GW IP地址、S-GW TEID之后，并且如果所述UE的eNB已经改变，则：
将具有SON(自组织网络)配置传输IE和SON信息请求IE的增强型eNB配置传输消息发送至所述UE的MME以用于转发至如在所述SON配置传输IE中包括的目标eNB-ID IE所指示的上一个eNB；以及，
从所述上一个eNB接收由所述增强型eNB配置传输消息所请求的包括所述UE的安全上下文的信息。
21.一种用于在LTE(长期演进)网络中操作的MME(移动管理实体)，其包括：
处理电路；
用于与演进型节点B(eNB)进行通信的S1-MME网络接口；
用于与服务网关(S-GW)进行通信的S11网络接口；
其中，所述处理电路用于：当所述eNB经由RRC连接请求消息从用户设备(UE)接收针对永久在线的S1-U承载的请求且由所述eNB转发给所述MME时，设立用于所述UE的随着所述UE在RRC_连接状态与RRC_空闲状态之间移动而持续的永久在线的S1-U承载，并且在S1释放过程期间或者另外当所述UE进入RRC_空闲状态或者ECM_空闲状态时，保留UE上下文信息，其中，所述RRC连接请求消息中包括永久在线指示符。
22.根据权利要求21所述的MME，其中，所述处理电路用于：通过将创建会话请求消息发送至选定的S-GW，并且将请求类型设置为永久在线的S1-U承载，从而建立所述永久在线的S1-U承载，其中，所述选定的S-GW被转发至P-GW(分组数据网络网关)以便设置默认EPS(演进型分组系统)承载。
23.根据权利要求22所述的MME，其进一步包括：用于与HSS(归属用户服务器)进行通信的S6a网络接口，以及其中，所述处理电路用于：在发送所述创建会话请求消息以建立所述永久在线的S1-U承载之前，通过利用所述HSS来验证所述UE的订阅数据来确认对所述永久在线的S1U承载的需要。
24.根据权利要求22所述的MME，其中，所述处理电路用于：响应于所述创建会话请求消息，从所述P-GW接收由所述S-GW转发的创建会话响应消息，并且将如由所述eNB所转发的附着接受消息发送至所述UE，从而通知所述UE向所述永久在线的S1-U承载分配的、选定的S-GW的IP(互联网协议)地址和S-GW TEID(隧道端点标识符)。
25.根据权利要求22所述的MME，其中，所述处理电路用于：当到新eNB和新S-GW的eNB和S-GW重定位发生时以及在从所述新eNB接收路径切换请求消息之后，将创建会话请求消息发送至新S-GW，所述新S-GW更新用于由新eNB已接受的默认承载的承载上下文；从所述新S-GW接收创建会话响应消息；以及将路径切换请求确认消息发送至所述新eNB，所述路径切换请求确认消息包括针对向所述永久在线的S1-U承载分配的所述S-GW的IP地址和S-GW TEID(隧道端点标识符)的更新。
26.一种用于在LTE(长期演进)网络中操作的服务网关(S-GW)，其包括：
处理电路；
用于与演进型节点B(eNB)进行通信的S1-U网络接口；以及
用于与移动管理实体(MME)进行通信的S11网络接口；
其中，所述处理电路用于：当针对UE(用户设备)，从MME接收将请求类型设置为永久在线的S1-U承载的创建会话请求消息时，设立具有用于所述UE的永久在线的S1-U承载的默认EPS承载，所述永久在线的S1-U承载在S1释放过程期间或者另外当所述UE进入RRC_空闲状态或者ECM_空闲状态时持续。
27.根据权利要求26所述的S-GW，其中，所述处理电路用于：如果所述UE不处于高移动性状态，则针对所述永久在线的S1-U承载分配S-GW TEID(隧道端点标识符)，使得其值对于用于所述永久在线的S1-U承载的S1-U接口是唯一的。
28.根据权利要求26所述的S-GW，其中，所述处理电路用于：如果所述UE处于高移动性状态，则分配用于所述永久在线的S1-U承载的S-GW TEID(隧道端点标识符)，使得其值对于由所述S-GW服务的所有S1-U接口是唯一的。
29.根据权利要求26所述的S-GW，其中，所述处理电路用于：运行不活动定时器，所述不活动定时器的值与由所述eNB使用的不活动定时器的值相比相同或者更小；以及，如果所述S-GW的不活动定时器到期，则将所述UE标记为空闲，并且如果接收到针对所述UE的下行链路数据，则将下行链路数据通知发送至所述MME。
30.一种用于在LTE(长期演进)网络中操作的UE(用户设备)，其包括：
无线收发机，其提供用于与eNB(演进型节点B)进行通信的空中接口；以及
连接至所述无线收发机的处理电路，用于如果应用利用小的数据传输运行使得在RRC_连接状态与RRC_空闲状态之间的切换数量超出了指定的阈值，则将请求永久在线的S1-U承载的消息发送至所述eNB，所述永久在线的S1-U承载随着所述UE在RRC_连接状态与RRC_空闲状态之间移动而持续。
31.根据权利要求30所述的UE，其中，所述处理电路用于：经由RRC连接请求消息从所述UE发送针对所述永久在线的S1-U承载的请求，所述RRC连接请求消息中包含有永久在线指示符。
32.根据权利要求30所述的UE，其中，所述处理电路用于：经由非接入层(NAS)消息将针对所述永久在线的S1-U承载的请求发送至所述eNB。
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