CN105519182A - 减少双连接系统中的分组重传 - Google Patents

减少双连接系统中的分组重传 Download PDF

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CN105519182A
CN105519182A CN201480047693.8A CN201480047693A CN105519182A CN 105519182 A CN105519182 A CN 105519182A CN 201480047693 A CN201480047693 A CN 201480047693A CN 105519182 A CN105519182 A CN 105519182A
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CN105519182B (zh
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拉蒂·凡尼瑟姆比
艾里·科克
凯西拉维特皮莱·西华尼申
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Apple Inc
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Intel IP Corp
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Abstract

公开了用于减少分组重传的技术。一种被配置用于双连接的主演进型节点B(MeNB)可以从用户设备(UE)接收指示在UE处成功从辅助演进型节点B(SeNB)被接收的分组的一个或多个确认(ACK)。MeNB可以从SeNB接收针对SeNB的分组传送信息。MeNB可以从SeNB接收关于SeNB和UE之间的空中接口连接丢失的指示。MeNB可以部分基于从UE接收的ACK和从SeNB接收的分组传送信息来识别未从SeNB被发送到UE的剩余分组，其中剩余分组由于SeNB和UE之间的连接丢失而未被发送到UE。MeNB可以将剩余分组从MeNB发送到UE。

Description

减少双连接系统中的分组重传
相关申请的交叉引用
本申请要求于2013年9月26日提交的代理案号为P61192Z的美国临时专利申请No.61/883,127的优先权，为了所有目的该临时申请的整个说明书通过引用以其整体结合于此。本申请还要求于2014年6月27日提交的代理案号为P66306的美国非临时专利申请No.14/317,837的优先权，为了所有目的该非临时申请的整个说明书通过引用以其整体结合于此。
背景技术
无线移动通信技术使用各种标准和协议来在节点(例如，传输站)和无线设备(例如，移动设备)之间传送数据。一些无线设备在下行链路(DL)传输中使用正交频分多址(OFDMA)，并且在上行链路(UL)传输中使用单载波频分多址(SC-FDMA)来进行通信。针对信号传输使用正交频分多路复用(OFDM)的标准和协议包括第三代合作伙伴项目(3GPP)长期演进(LTE)、电气与电子工程师协会(IEEE)802.16标准(例如，802.16e、802.16m)(通常被产业集群称为WiMAX(全球微波接入互操作性))、以及IEEE802.11标准(通常被产业集群称为WiFi)。
在3GPP无线电接入网(RAN)LTE系统中，节点可以是演进的通用地面无线电接入网(E-UTRAN)节点B(通常也表示为演进的节点B、增强型节点B、eNodeB、或eNB)和无线电网络控制器(RNC)的组合，节点与被称为用户设备(UE)的无线设备进行通信。下行链路(DL)传输可以是从节点(例如，eNodeB)到无线设备(例如，UE)的通信，并且上行链路(UL)传输可以是从无线设备到节点的通信。
在同构网络中，节点(也被称为宏节点)可以给小区中的无线设备提供基本的无线覆盖。小区可以是无线设备能操作来与宏节点进行通信的区域。异构网络(HetNet)可用于处理由无线设备的增加的使用和功能而引起的宏节点上的增加的流量负载。HetNet可以包括一层计划的高功率宏节点(或宏eNB)，其交叠有可以以未很好计划的或甚至完全不协调的方式在宏节点的覆盖范围(小区)内被采用的多层较低功率节点(小eNB、微eNB、微微eNB、毫微微eNB、或家庭eNB[HeNB])。较低功率节点(LPN)通常被称为“低功率节点”、小节点、或小小区。
在LTE中，数据可以经由物理下行链路共享信道(PDSCH)从eNodeB被传送到UE。物理上行链路控制信道(PUCCH)可用于确认数据被接收。下行链路和上行链路信道或下行链路和上行链路传输可以使用时分复用(TDD)或频分复用(FDD)。
附图说明
结合附图，从随后的详细描述中，本公开的特征和优势将是显而易见的，附图通过示例的方式共同示出了本公开的特征；并且，其中：
图1A-1E示出了根据示例的双连接架构；
图1F示出了根据示例的能操作来支持双连接的用户设备(UE)的架构；
图2示出了根据示例的当UE和辅助演进型节点B(SeNB)之间发生连接丢失时代替SeNB将分组发送到用户设备(UE)的主演进型节点B(MeNB)；
图3示出了根据示例的当UE和主演进型节点B(MeNB)之间发生连接丢失时代替MeNB将分组发送到用户设备(UE)的辅助演进型节点B(SeNB)；
图4描绘了根据示例的能操作来减少分组重传的主演进型节点B(MeNB)的计算机电路的功能；
图5描绘了根据示例的能操作来支持双连接的用户设备(UE)的计算机电路的功能；
图6描绘了根据示例的用于减少双连接系统中的分组重传的方法的流程图；以及
图7示出了根据示例的无线设备(例如，UE)的图示。
现在将要参照所示出的示例性实施例，并且本文将使用特定的语言来描述相同的示例性实施例。然而，应该理解的是其不旨在限制本发明的范围。
具体实施方式
详细描述
在本发明被公开和描述之前，要理解的是本发明不限于本文所公开的特定的结构、处理步骤或材料，而是扩展至其等价形式，这将被相关领域的普通技术人员认识到。还应该理解的是本文所采用的术语仅被用于描述特定示例的目的并且不旨在是限制性的。不同附图中的相同参考标号表示相同的元件。流程图和过程中所提供的标号被提供用于清楚说明步骤和操作，并且不一定指示特定的顺序或序列。
示例实施例
下面提供了技术实施例的初步概述，然后进一步详细描述具体的技术实施例。该初步的总结旨在帮助读者更快速地理解该技术，而不是旨在标识该技术的关键特征或必要特征，也不是旨在限制所要求保护的主题的范围。
在3GPPLTE版本12中，用户设备(UE)可以同时连接到不止一个小区站点。例如，UE可以同时连接到主演进型节点B(MeNB)和至少一个辅助演进型节点B(SeNB)。当UE连接到两个小区时，UE可以基本同时从这两个小区接收数据承载。多个承载可以基于S1-U终止的位置和承载分离的位置来被发送到UE。在一个示例中，S1-U可以在MeNB处终止，并且承载分离可以在MeNB的分组数据汇聚协议(PDCP)层处被执行。
图1A示出了针对主演进型节点B(MeNB)和辅助演进型节点B(SeNB)的双连接架构的示例。S1-U可以在MeNB处终止，并且承载分离可以在MeNB处发生。此外，独立的无线电链路控制(RLC)可以存在于MeNB和SeNB中用于分离承载。MeNB可以经由S1接口被连接到演进型分组核心(EPC)。例如，MeNB可以经由S1接口被连接到服务网关(S-GW)或移动性管理实体(MME)。MeNB可以包括PDCP层、RLC层和介质访问信道(MAC)层。SeNB可以包括RLC层和MAC层。MeNB可以在PDCP层处从较高层(例如，IP层或应用层)接收数据和/或控制信息。在一个示例中，数据或控制信息可以从MeNB中的PDCP层被传送到MeNB中的RLC和MAC层。此外，数据或控制信息可以经由X2接口从MeNB中的PDCP层被传送到SeNB中的RLC层。
图1B示出了针对主演进型节点B(MeNB)和辅助演进型节点B(SeNB)的双连接架构的另一示例。S1-U可以在SeNB处终止，并且SeNB和MeNB二者都可以包括独立的分组数据汇聚协议(PDCP)，即无承载分离。MeNB和SeNB可以经由S1接口被连接到演进型分组核心(EPC)。例如，MeNB和SeNB可以经由S1接口被连接到服务网关(S-GW)或移动性管理实体(MME)。MeNB可以包括PDCP层、无线电链路控制(RLC)层和介质访问信道(MAC)层。此外，SeNB可以包括单独的PDCP层、RLC层和MAC层。MeNB中的PDCP层可以从较高层接收数据或控制信息，并且SeNB中的PDCP层可以从较高层接收数据或控制信息。
图1C示出了针对主演进型节点B(MeNB)和辅助演进型节点B(SeNB)的双连接架构的又一示例。S1-U可以在MeNB处终止，并且承载分离可以在MeNB处发生。此外，主-从无线电链路控制(RLC)可以存在于MeNB和SeNB中用于分离承载。MeNB可以经由S1接口被连接到演进型分组核心(EPC)。例如，MeNB可以经由S1接口被连接到服务网关(S-GW)或移动性管理实体(MME)。MeNB可以包括PDCP层、RLC层和介质访问信道(MAC)层。SeNB可以包括RLC层和MAC层。MeNB可以在PDCP层处从较高层(例如，IP层或应用层)接收数据和/或控制信息。在一个示例中，数据或控制信息可以从MeNB中的PDCP层被传送到MeNB中的RLC层和MAC层。此外，数据或控制信息可以经由X2接口从MeNB中的RLC层被传送到SeNB中的RLC层。
图1D示出了针对主演进型节点B(MeNB)和辅助演进型节点B(SeNB)的双连接架构的又一示例。S1-U可以在MeNB处终止，并且无承载分离可以在MeNB处发生。此外，独立的无线电链路控制(RLC)可以存在于SeNB处。MeNB可以经由S1接口被连接到演进型分组核心(EPC)。例如，MeNB可以经由S1接口被连接到服务网关(S-GW)或移动性管理实体(MME)。MeNB可以包括PDCP层、RLC层和介质访问信道(MAC)层。SeNB可以包括RLC层和MAC层。MeNB可以在PDCP层处从较高层接收数据和/或控制信息。在一个示例中，数据或控制信息可以从MeNB中的PDCP层被传送到MeNB中的RLC层和MAC层。此外，数据或控制信息可以经由X2接口从MeNB中的PDCP层被传送到SeNB中的RLC层。
图1E示出了针对主演进型节点B(MeNB)和辅助演进型节点B(SeNB)的双连接架构的又一示例。S1-U可以在MeNB处终止，并且无承载分离可以在MeNB处发生。此外，主-从无线电链路控制(RLC)可以存在用于SeNB承载。MeNB可以经由S1接口被连接到演进型分组核心(EPC)。例如，MeNB可以经由S1接口被连接到服务网关(S-GW)或移动性管理实体(MME)。MeNB可以包括PDCP层、RLC层和介质访问信道(MAC)层。SeNB可以包括RLC层和MAC层。MeNB可以在PDCP层处从较高层(例如，IP层或应用层)接收数据和/或控制信息。在一个示例中，数据或控制信息可以从MeNB中的PDCP层被传送到MeNB中的RLC层和MAC层。此外，数据或控制信息可以经由X2接口从MeNB中的RLC层被传送到SeNB中的RLC层。
图1A-1E中所述的双连接架构在3GPP技术综述(TR)36.842版本12.0.0中被进一步讨论。
图1F示出了用户设备(UE)的示例性架构。UE可以被配置为与双连接架构中的主演进型节点B(MeNB)和辅助演进型节点B(SeNB)进行通信。UE可以包括PDCP层、RLC层和MAC层。UE中的PDCP层可以从MeNB接收数据和/或控制信息。此外，UE中的PDCP层可以从SeNB接收数据和/或控制信息。在一个示例中，数据或控制信息可以从UE中的PDCP层被传送到UE中的较低层(例如，RLC层和MAC层)。
在一个示例中，UE可以与双连接架构中的SeNB和MeNB这二者进行通信。MeNB中的分组数据汇聚协议(PDCP)层可以从较高层(例如，IP层或应用层)接收分组。分组可以是PDCP/RLC分组。此外，分组可以包括数据或控制信息。MeNB中的PDCP层可以选择将从较高层接收到的分组的第一部分传送到MeNB中的较低层(例如，RLC层和MAC层)。此后，这些分组可以被传送到UE。此外，MeNB中的PDCP层可以选择将从较高层接收到的分组的第二部分经由X2接口传送到SeNB中的RLC层。RLC层可以对分组进行分段，并且将分段的分组发送到UE。PDCP层可以根据承载分离比例选择第一部分和第二部分。作为示例，MeNB中的PDCP层可以从较高层接收10个PDCP分组，其中每个PDCP分组是1000字节。在10个PDCP分组之外，4个PDCP分组可以根据承载分离比例被传送到MeNB中的较低级并且6个PDCP分组可以被传送到SeNB中的RLC层。SeNB可以将6个PDCP分组分为较小的RLC分组。例如，SeNB可以将6个PDCP分组分为24个RLC分组(即，每个RLC分组是250字节)。SeNB可以将RLC分组发送到UE。
尽管不期望支持具有适中或高移动性的双连接，但是双连接可以被支持具有低移动性。当UE处于低移动性时，UE和SeNB之间的连接可能恶化并最终丢失。当SeNB和UE之间的连接丢失时，SeNB不再向UE发送分组。分组可以包括PDCP/RLC分组。当连接丢失并且无增强正被实现时，SeNB可以向MeNB发送分组传送信息(例如，与传送的分组和未传送的分组有关的信息)，从而使得MeNB可以发送/重新发送未到达UE的分组。
在UE和SeNB之间的连接丢失之前，UE可能已经从SeNB接收到一些分组或全部分组。然而，由于UE和SeNB之间的连接丢失，UE可能无法将针对接收到的分组的确认(ACK)成功发送到SeNB。换句话说，UE可能尝试将ACK发送到SeNB，但是由于恶化的上行链路，ACK可能无法在SeNB处被成功接收。作为示例，UE可以从SeNB接收10个分组，但是可能仅发送针对分组中的4个分组的ACK。因此，SeNB可能不知道之后的6个分组在UE处成功被接收。
当UE和SeNB之间的连接丢失时，MeNB可以考虑经由SeNB在UE处被成功接收到的分组。MeNB可以确定在连接丢失之前哪些分组在UE处未被接收到，并且仅将这些分组发送到UE。例如，SeNB可能将10个分组的集合中的4个分组成功发送到UE，然后SeNB和UE之间的连接丢失。MeNB可以仅发送10个分组的集合中的剩余6个分组，而不是MeNB将全部的10个分组发送到UE(如传统系统中所执行的)。换句话说，MeNB可以确定当连接丢失时在UE处哪些分组已被接收、以及哪些分组未被接收。MeNB可以在SeNB处恢复未决的分组(即，由于连接丢失而无法被发送的分组)，而不必将所有分组都发送到UE。因此，数据延迟可以被减少，总的资源利用/数据吞吐量可以被增加，并且UE处的功率消耗可以被减少。此外，所描述的技术既可以适用于下行链路情境也可以适用于上行链路情境。
在另一示例中，SeNB可能将10个分组的集合中的3个分组成功发送到UE，然后SeNB和UE之间的连接丢失。UE可能尝试发送针对在连接丢失之前在UE处成功被接收的3个分组的ACK。不论SeNB成功到接收针对3个分组的ACK还是未接收到针对3个分组的ACK，MeNB可以将10个分组的集合中的剩余7个分组发送到UE。然而，在传统系统中，如果SeNB未接收到针对3个分组的ACK，则MeNB可能将所有10个分组发送到UE。换句话说，在传统系统中，UE可能接收之前在UE处已被接收到的分组。
图2示出了主演进型节点B(MeNB)202，当UE206和辅助演进型节点B(SeNB)204之间发生连接丢失时MeNB202代替SeNB204将分组发送到用户设备(UE)206。通常，UE206可以与双连接中的SeNB204和MeNB202二者传送分组。分组可以包括PDCP/RLC分组。例如，SeNB204可以将10个分组发送到UE206。UE206可以将针对成功被接收的分组的确认(ACK)发送到SeNB204。UE206还可以将针对未成功被接收的分组的否定确认(NACK)发送到SeNB204。此外，MeNB202可以将分组发送到UE206，并且UE206可以相应地将针对成功被接收或未成功被接收的分组的ACK/NACK发送到MeNB202。
在一个示例中，SeNB204和UE206之间的空中接口连接可能丢失。连接可能由于UE206的低移动性而丢失。替代地，连接可能由于信道变化而丢失。当连接丢失时，SeNB204可能无法将分组发送到UE206。此外，UE206可能无法发送针对在连接丢失之前在UE206处成功被接收的分组的ACK/NACK。
UE206可以维护分组接收信息，即使在UE206和SeNB204之间的连接丢失之后。在传统系统中，当UE206和SeNB204之间的连接丢失时，UE206可能清除(flush)分组接收信息(即，未存储哪些分组在UE206处从SeNB204被接收或未被接收)。当连接丢失时，UE206可以根据分组接收信息将针对在UE206处从SeNB204被接收的分组的ACK/NACK发送到MeNB202。替代地，UE206可以定期地将ACK/NACK发送到MeNB202。换句话说，MeNB202可以定期地接收与哪些分组在UE206处从SeNB204被接收或未被接收有关的信息。
在一个配置中，MeNB202可以针对UE206分配资源以将ACK/NACK发送到MeNB202。例如，MeNB202可以检测UE206和SeNB204之间的连接丢失，然后针对UE206分配资源以将ACK/NACK发送到MeNB202。替代地，MeNB202可以授权针对经由随机接入信道(RACH)从UE206接收资源的请求，以使得UE206能够定期地将ACK/NACK发送到MeNB202。在另一示例中，MeNB202可以授权针对与上行链路数据一起从UE206接收资源的请求，以使得UE206能够定期地将ACK/NACK发送到MeNB202。因此，MeNB202可以知道哪些分组(例如，RUC分组)在UE206处从SeNB204成功被接收、以及哪些分组在UE206处从SeNB204未被成功接收。
SeNB204可以经由X2接口将分组传送信息、以及关于SeNB204和UE206之间的连接丢失的指示发送到MeNB202。分组传送信息可以包括针对SeNB204的PDCP/RLC分组传送状态信息、以及RLC分段信息。PDCP/RLC分组传送状态信息可以描述在连接丢失之前在UE206处从SeNB204成功被接收的分组、以及在连接丢失之后在UE206处从SeNB204未成功被接收的分组和/或无法从SeNB204被发送的分组。SeNB204可以基于从UE206接收的ACK/NACK来确定哪些分组成功被接收。在一个示例中，在UE206和SeNB204之间的连接丢失之后，SeNB204可以经由MeNB202从UE206接收ACK/NACK。此外，RLC分段信息可以描述PDCP分组如何在SeNB204处被分为RLC分组。
MeNB202可以使用从UE206接收到的ACK/NACK、从SeNB204接收到的PDCP/RLC分组传送状态信息、以及从SeNB204接收到的RLC分段信息，以便确定哪些分组要发送到UE206。MeNB202可以基于ACK/NACK、PDCP/RLC分组传送状态信息以及RLC分段信息来选择在UE206处尚未接收到的分组。MeNB202可以将这些分组发送到UE206。换句话说，由于分组传输通过MeNB202，MeNB202可能已经具有要被传送到UE206的分组的副本。因此，UE206可能不必从MeNB202接收已经从SeNB204接收到的分组。在一个配置中，MeNB202可以在下行链路情境以及上行链路情境中将分组发送到UE206。
作为非限制性示例，SeNB204可以包括要被发送到UE206的PDCP分组。PDCP分组可以是1000字节。此外，PDCP分组可以被分为较小的RLC分组。例如，PDCP分组可以被分为5个RLC分组，其中每个RLC分组是200字节。因此，SeNB204可以将5个RLC分组发送到UE206。在UE206和SeNB204之间的连接丢失之前，SeNB204可以将600字节(即，前3个RLC分组)发送到UE206。因此，SeNB204可能无法将剩余的400字节(即，最后的2个分组)发送到UE206。UE206可以将指示UE206已从SeNB204成功接收600字节的ACK发送到MeNB202。此外，UE206可以将指示剩余400字节未成功从SeNB204被接收的NACK发送到MeNB202。此外，MeNB202可以从SeNB204接收指示SeNB204发送600字节到UE206的PDCP/RLC分组传送状态信息，但是不可以将剩余的400字节发送到UE206。此外，MeNB202可以接收指示PDCP分组被分为五个较小的RLC分组的RLC分段信息。基于ACK/NACK、PDCP/RLC分组传送状态信息、以及RLC分段信息，MeNB202可以确定600字节在UE206处成功被接收以及400字节在UE206处未被接收。因此，MeNB202可以将400字节发送到UE206，而无需重新将600字节发送到UE206。
在一个配置中，由于SeNB204和UE206之间的连接丢失，SeNB204可能无法将分组发送到UE206。因此，SeNB204可以将分组发送到MeNB204，并且MeNB204可以将分组转发到UE206。作为非限制性示例，在连接丢失之前，SeNB204可以将1000字节中的200字节发送到UE206。SeNB可以将剩余的800字节发送到MeNB202，其中MeNB202可以将剩余的800字节转发到UE206。因此，UE206可能未从MeNB接收在UE206处已成功从SeNB204被接收的分组。
图3示出了辅助演进型节点B(SeNB)304，当UE306和主演进型节点B(MeNB)202之间发生连接丢失时SeNB304代替MeNB302将分组发送到用户设备(UE)306。通常，UE306可以与双连接中的SeNB304和MeNB302二者进行通信。例如，MeNB302可以将分组发送到UE306，并且SeNB304可以将分组发送到UE306。分组可以包括PDCP/RLC分组。在一个示例中，MeNB302和UE306之间的空中接口连接可能丢失。连接可能由于UE306的低移动性而丢失。替代地，连接可能由于信道变化而丢失。当连接丢失时，MeNB302可能无法将分组发送到UE306。此外，UE306可能无法向MeNB302发送针对在连接丢失之前在UE306处成功被接收的分组的ACK/NACK。
UE306可以维护分组接收信息，即使是在UE306和MeNB302之间的连接丢失之后。UE306可以根据分组接收信息将针对在UE306处从MeNB302被接收的分组的ACK/NACK发送到SeNB304。当UE306和MeNB302之间的连接丢失时，UE306可以将ACK/NACK发送到SeNB304。替代地，UE306可以定期地将ACK/NACK发送到SeNB304。换句话说，SeNB304可以定期地接收与哪些分组在UE306处从MeNB302被接收有关的信息。
在一个配置中，SeNB304可以针对UE306分配资源以将ACK/NACK发送到SeNB304。例如，SeNB304可以检测UE306和MeNB302之间的连接丢失，然后针对UE306分配资源以将ACK/NACK发送到SeNB304。替代地，SeNB304可以授权针对经由随机接入信道(RACH)从UE306接收的资源的请求，以使得UE306能够定期地将ACK/NACK发送到SeNB304。在另一示例中，SeNB304可以授权针对与上行链路数据一起从UE306接收的资源的请求，以使得UE306能够定期地将ACK/NACK发送到SeNB304。因此，SeNB304可以知道哪些分组(例如，RLC分组)在UE306处成功从MeNB302被接收、以及哪些分组在UE306处未成功从MeNB302被接收。
MeNB302可以经由X2接口将分组传送信息、以及关于MeNB302和UE306之间的连接丢失的指示发送到SeNB304。分组传送信息可以包括针对MeNB302的PDCP/RLC分组传送状态信息、以及RLC分段信息。PDCP/RLC分组传送状态信息可以描述在连接丢失之前在UE306处成功从MeNB302被接收的分组、以及在连接丢失之后在UE306处未成功从MeNB302被接收的分组和/或无法从MeNB302被发送的分组。MeNB302可以基于从UE306接收的ACK/NACK来确定哪些分组成功被接收。在一个示例中，在UE306和MeNB302之间的连接丢失时，MeNB302可以经由SeNB304从UE306接收ACK/NACK。此外，RLC分段信息可以描述PDCP分组如何在MeNB302处被分为RLC分组。
SeNB202可以基于ACK/NACK、PDCP/RLC分组传送状态信息以及RLC分段信息来选择在UE306处尚未接收到的分组。换句话说，SeNB202可以识别丢失的(即，无法被发送到UE306)分组，然后将分组发送到UE306。在一个示例中，当MeNB连接丢失时，分组(例如，PDCPPDU或RLCSDU)可以通过X2接口从MeNB302被转发到SeNB304，然后SeNB204可以将分组发送到UE306。因此，UE306可能不必从SeNB接收已经从MeNB302接收到的分组。在一个配置中，SeNB304可以在下行链路情境以及上行链路情境中将分组发送到UE306。
另一示例提供了能操作来减少分组重传的、被配置用于双连接的主演进型节点B(MeNB)的计算机电路的功能400，如图4中流程图所示。功能可以被实现为方法、或功能可以作为指令在机器上被执行，其中指令被包括在至少一个计算机可读介质或一个非暂态机器可读存储介质上。计算机电路可以被配置为从用户设备(UE)接收指示在UE处成功从辅助演进型节点B(SeNB)被接收的分组的一个或多个确认(ACK)，如框410中所示。计算机电路可以被配置为从SeNB接收针对SeNB的分组传送信息，如框420中所示。计算机电路可以被配置为从SeNB接收关于SeNB和UE之间的空中接口连接丢失的指示，如框430中所示。计算机电路可以被配置为部分基于从UE接收的ACK和从SeNB接收的分组传送信息来识别未从SeNB被发送到UE的剩余分组，其中剩余分组由于SeNB和UE之间的连接丢失而未被发送到UE，如框440中所示。计算机电路可以被配置为将剩余分组从MeNB发送到UE，如框450中所示。
在一个示例中，分组传送信息包括针对SeNB的分组数据汇聚协议(PDCP)/无线电链路控制(RLC)分组传送状态信息和RLC分段信息，PDCP/RLC分组传送状态信息和RLC分段信息经由X2接口在MeNB处从SeNB被接收。在一个配置中，计算机电路还可以被配置为：检测UE和SeNB之间的连接丢失；以及针对UE分配资源以将ACK发送到MeNB。
在一个示例中，计算机电路还可以被配置为授权针对经由随机接入信道(RACH)从UE接收的资源的请求，以使得UE能够定期地将ACK发送到MeNB。此外，计算机电路还可以被配置为授权针对与上行链路数据一起从UE接收的资源的请求，以使得UE能够定期地将ACK发送到MeNB。
在一个示例中，计算机电路还可以被配置为通过空中接口信令信道从UE接收ACK。在一个配置中，RLC分段信息描述PDCP分组在SeNB处到RLC分组的分段。在另一配置中，分组包括RLC分组。
另一示例提供了能操作来支持双连接的用户设备(UE)的计算机电路的功能500，如图5中流程图所示。功能可以被实现为方法、或功能可以作为指令在机器上被执行，其中指令被包括在至少一个计算机可读介质或一个非暂态机器可读存储介质上。计算机电路可以被配置为从辅助演进型节点B(SeNB)接收一个或多个分组，如框510中所示。计算机电路可以被配置为将指示成功从SeNB被接收的分组的一个或多个确认(ACK)发送到主演进型节点B(MeNB)，如框520中所示。计算机电路可以被配置为当UE和SeNB之间发生空中接口连接丢失时从MeNB接收剩余的分组，其中MeNB部分基于从UE接收的ACK和在MeNB处从SeNB接收的分组传送消息来将剩余分组发送到UE，如框530中所示。
在一个示例中，分组传送信息包括针对SeNB的分组数据汇聚协议(PDCP)分组传送状态信息和无线电链路控制(RLC)分段信息。在另一示例中，UE支持与SeNB和MeNB的双连接。
在一个示例中，计算机电路还可以被配置为将指示未成功从SeNB被接收的分组的一个或多个否定确认(NACK)发送到MeNB。此外，计算机电路还可以被配置为在UE和SeNB之间发生空中接口连接丢失之后存储RLC分组接收事件。在一个配置中，UE和SeNB之间的空中接口连接丢失由于UE的移动性或信道的变化而发生。
在一个示例中，计算机电路还可以被配置为将针对资源的请求发送到MeNB，资源使得UE能够将ACK发送到MeNB。在另一示例中，针对资源的请求经由随机接入信道(RACH)或与上行链路数据一起被发送到MeNB。在又一示例中，UE包括天线、触敏显示屏、扬声器、麦克风、图形处理器、应用处理器、内部存储器、或非易失性存储器端口。
另一示例提供了用于减少双连接系统中的分组重传的方法600，如图6中流程图所示。方法可以作为指令在机器上被执行，其中指令被包括在至少一个计算机可读介质或一个非暂态机器可读存储介质上。方法可以包括从用户设备(UE)接收指示在UE处成功从辅助演进型节点B(SeNB)被接收的分组的一个或多个确认(ACK)的操作，如框610中所示。方法可以包括接收指示在UE处未成功从SeNB被接收的分组的一个或多个否定确认(NACK)的操作，如框620中所示。方法可以包括接收针对SeNB的分组数据汇聚协议(PDCP)/无线电链路控制(RLC)分组传送状态信息和针对SeNB的RLC分段信息的操作，如框630中所示。方法可以包括从SeNB接收关于SeNB和UE之间的空中接口连接丢失的指示的操作，如框640中所示。方法可以包括部分基于从UE接收的ACK/NACK、PDCP/RLC分组传送状态信息和RLC分段信息来识别未从SeNB被发送到UE的剩余分组的操作，剩余分组由于SeNB和UE之间的空中接口连接丢失而未从SeNB被发送到UE，如框650中所示。方法可以包括将剩余分组从MeNB发送到UE的操作，如框660中所示。
在一个示例中，方法可以包括经由X2接口从SeNB接收PDCP/RLC分组传送状态信息和RLC分段信息。此外，方法可以包括经由随机接入信道(RACH)从UE接收针对资源的请求，以使得UE能够将ACK发送到MeNB；或从UE接收针对资源的请求以及上行链路数据，该资源使得UE能够将ACK发送到MeNB。
图7提供了无线设备(例如，用户设备(UE)、移动站(MS)、移动无线设备、移动通信设备、平板、手机、或其他类型的无线设备)的示例图解。无线设备可以包括一根或多根天线，该一根或多根天线被配置为与节点、宏节点、低功率节点(LPN)或传输站(例如，基站(BS)、演进型节点B(eNB)、基带单元(BBU)、远程无线电头端(RRH)、远程无线电设备(RRE)、中继站(RS)、无线电设备(RE)、或其他类型的无线广域网(WWAN)接入点)进行通信。无线设备可以被配置为使用至少一种无线通信标准(包括3GPPLTE、WiMAX、高速分组接入(HSPA)、蓝牙、以及Wi-Fi)进行通信。无线设备可以针对每种无线通信标准使用单独的天线或者针对多种无线通信标准使用共享天线。无线设备可以在无线局域网(WLAN)、无线个域网(WPAN)和/或WWAN中进行通信。
图7还提供了麦克风和一个或多个扬声器的图解，该麦克风和一个或多个扬声器可以被用于从无线设备音频输入和从无线设备的音频输出。显示屏可以是液晶显示(LCD)屏、或者其他类型的显示屏(例如，有机发光二极管(OLED)显示器)。显示屏可以被配置为触摸屏。触摸屏可以使用电容性触摸屏技术、电阻性触摸屏技术、或其他类型的触摸屏技术。应用处理器和图形处理器可以被耦合到内部存储器，以提供处理和显示能力。非易失性存储器端口也可以被用来向用户提供数据输入/输出选项。非易失性存储器端口还可以被用来扩展无线设备的存储器容量。可以将键盘与无线设备相集成，或者将键盘无线连接到无线设备以提供附加的用户输入。也可以使用触摸屏来提供虚拟键盘。
各种技术或者其某些方面或部分可以采用被嵌入到有形介质(例如，软盘、CD-ROM、硬驱动器、非暂态计算机可读存储介质、或任意其他机器可读存储介质)中的程序代码(即，指令)的形式，其中，当程序代码被加载到机器(例如，计算机)中并且由该机器运行时，该机器成为用于实施各种技术的装置。电路可以包括硬件、固件、程序代码、可执行代码、计算机指令、和/或软件。非暂态计算机可读存储介质可以是不包括信号的计算机可读存储介质。在程序代码在可编程计算机上运行的情形中，计算设备可以包括处理器、处理器可读的存储介质(包括易失性和非易失性存储器和/或存储元件)、至少一个输入设备、以及至少一个输出设备。易失性和非易失性存储器和/或存储元件可以是RAM、EPROM、闪速驱动器、光驱动器、磁性硬驱动器、或用于存储电子数据的其他介质。节点和移动设备还可以包括收发机模块、计时器模块、处理模块、和/或时钟模块或定时器模块。可以实现或利用本文所描述的各种技术的一个或多个程序可以使用应用程序界面(API)、可再用控件等。这样的程序可以被实现于高级程序或面向对象的编程语言中，从而与计算机系统进行通信。然而，(一个或多个)程序可以按需被实现于组件或机器语言中。在任何情形中，语言可以是编译型语言或解释型语言，并且将其与硬件实现方式相结合。
应当理解，本说明书中所描述的功能单元中的许多功能单元以被标记为模块，以便更加着重强调其实现方式的独立性。例如，模块可以被实现为硬件电路，该硬件电路包括常规VLSI电路或门阵列、现成的半导体(例如，逻辑芯片、晶体管、或其他分立组件)。模块还可以被实现于可编程硬件设备(例如，现场可编程门阵列、可编程阵列逻辑、可编程逻辑器件，等等)中。
模块还可以被实现于由各种类型的处理器运行的软件中。所标识的可执行代码的模块例如可以包括计算机指令的一个或多个物理块或逻辑块，其例如可以被组织为对象、程序、或功能。然而，所标识的模块的可执行性不需要物理上位于一起，而是可以包括存储于不同位置中的不同的指令，当这些存储于不同位置中的不同的指令在逻辑上被结合在一起时，其包括该模块并且实现该模块所声明的目的。
实际上，可执行代码的模块可以是单个指令、或许多指令，并且甚至可以跨若干个存储器设备且在不同的程序间被分布于若干个不同的代码段上。类似地，操作数据在本文中可以在模块内被识别和说明，并且可以以任意适当的形式被嵌入并且被组织到任意适当类型的数据结构中。操作数据可以被收集为单个数据集，或者可以被分布于不同的位置(包括不同的存储设备上)，并且可以至少部分地仅作为系统或网络上的电子信号而存在。模块可以是主动的或是被动的，包括可操作以执行所期望的功能的代理。
贯穿本说明书对“示例”的指代意思是结合被包括在本发明的至少一个实施例中的示例所描述的特定特征、结构、或特点。因此，贯穿本说明书在各个位置出现的短语“在示例中”不一定全部指代同一实施例。
如本文所使用的，为方便起见，多个项、结构元件、组成元件、和/或材料可以被呈现在一般列表中。然而，这些列表应该被理解为好像列表中的每个成员被独立标识为单独且唯一的成员一样。因此，基于其在一般群组中的呈现而无需相反的指示，这样的列表中的独立成员不应该被解释为同一列表的任意其他成员的事实上的等同。此外，本发明的各种实施例和示例在本文可以随着其各种组分的替代一起被指代。应当理解，这样的实施例、示例和替代不被解释为彼此的事实上的等同，而被考虑为对本发明的独立且自主的表示。
而且，所描述的特征、结构、或特点可以在一个或多个实施例中以任意适当的方式进行组合。在如下的描述中，提供了大量具体细节(例如，布局的示例、距离、网络示例等)，以提供对本发明的实施例的透彻的理解。然而，相关领域的技术人员将认识到，可以在无需这些具体细节中的一个或多个的情况下实施本发明，或者利用其它方法、组件、布局等来实施本发明。在其它实例中，为了避免模糊本发明的各方面，对众所周知的结构、材料、或操作未进行详细示出或描述。
尽管前面的示例是在一个或多个特定应用中对本发明的原理的说明，但在不背离本发明的概念和原理并且无需发明人员的练习的情况下，可以在实现方式的形式、使用和细节上做出大量修改，这对于本领域技术人员而言是显而易见的。因此，除所附权利要求所提出的之外，不意欲对本发明进行限制。

Claims (21)

1.一种被配置用于双连接的主演进型节点B(MeNB)，该MeNB能操作来减少分组重传，所述MeNB具有计算机电路，所述计算机电路被配置为：
从用户设备(UE)接收指示在所述UE处成功从辅助演进型节点B(SeNB)被接收的分组的一个或多个确认(ACK)；
从SeNB接收针对所述SeNB的分组传送信息；
从所述SeNB接收关于所述SeNB和所述UE之间的空中接口连接丢失的指示；
部分基于从所述UE接收的所述ACK和从所述SeNB接收的所述分组传送信息来识别未从所述SeNB被发送到所述UE的剩余分组，其中所述剩余分组由于所述SeNB和所述UE之间的所述连接丢失而未被发送到所述UE；以及
将所述剩余分组从所述MeNB发送到所述UE。
2.如权利要求1所述的计算机电路，其中，所述分组传送信息包括针对所述SeNB的分组数据汇聚协议(PDCP)/无线电链路控制(RLC)分组传送状态信息和RLC分段信息，所述PDCP/RLC分组传送状态信息和所述RLC分段信息经由X2接口在所述MeNB处从所述SeNB被接收。
3.如权利要求1所述的计算机电路，还被配置为：
检测所述UE和所述SeNB之间的所述连接丢失；以及
为所述UE分配资源以将所述ACK发送到所述MeNB。
4.如权利要求1所述的计算机电路，还被配置为：授权针对经由随机接入信道(RACH)从所述UE接收的资源的请求，以使得所述UE能够定期地将所述ACK发送到所述MeNB。
5.如权利要求1所述的计算机电路，还被配置为：授权针对与上行链路数据一起从所述UE接收的资源的请求，以使得所述UE能够定期地将所述ACK发送到所述MeNB。
6.如权利要求1所述的计算机电路，还被配置为：通过空中接口信令信道从所述UE接收所述ACK。
7.如权利要求1所述的计算机电路，其中，所述RLC分段信息描述所述在SeNB处PDCP分组到RLC分组的分段。
8.如权利要求1所述的计算机电路，其中，所述分组包括RLC分组。
9.一种能操作来支持双连接的用户设备(UE)，所述UE具有计算机电路，所述计算机电路被配置为：
从辅助演进型节点B(SeNB)接收一个或多个分组；
将指示成功从SeNB被接收的分组的一个或多个确认(ACK)发送到主演进型节点B(MeNB)；以及
当所述UE和所述SeNB之间发生空中接口连接丢失时从所述MeNB接收剩余分组，其中所述MeNB部分基于从所述UE接收的所述ACK和在所述MeNB处从所述SeNB接收的分组传送消息来将所述剩余分组发送到所述UE。
10.如权利要求9所述的计算机电路，其中，所述分组传送信息包括针对所述SeNB的分组数据汇聚协议(PDCP)分组传送状态信息和无线电链路控制(RLC)分段信息。
11.如权利要求9所述的计算机电路，其中，所述UE支持与所述SeNB和所述MeNB的双连接。
12.如权利要求9所述的计算机电路，还被配置为：将指示未成功从所述SeNB被接收的分组的一个或多个否定确认(NACK)发送到所述MeNB。
13.如权利要求9所述的计算机电路，还被配置为：在所述UE和所述SeNB之间发生空中接口连接丢失之后存储RLC分组接收事件。
14.如权利要求9所述的计算机电路，其中，所述UE和所述SeNB之间的空中接口连接丢失由于所述UE的移动性或信道变化而发生。
15.如权利要求9所述的计算机电路，还被配置为：将针对资源的请求发送到所述MeNB，所述资源使得所述UE能够将所述ACK发送到所述MeNB。
16.如权利要求15所述的计算机电路，其中，所述针对资源的请求经由随机接入信道(RACH)或与上行链路数据一起被发送到所述MeNB。
17.如权利要求9所述的计算机电路，其中，所述UE包括天线、触敏显示屏、扬声器、麦克风、图形处理器、应用处理器、内部存储器、或非易失性存储器端口。
18.一种用于减少双连接系统中的分组重传的方法，所述方法包括：
从用户设备(UE)接收指示在UE处成功从辅助演进型节点B(SeNB)被接收的分组的一个或多个确认(ACK)；
从所述UE接收指示在所述UE处未成功从SeNB被接收的分组的一个或多个否定确定(NACK)；
接收针对所述SeNB的分组数据汇聚协议(PDCP)/无线电链路控制(RLC)分组传送状态信息和针对所述SeNB的RLC分段信息；
从所述SeNB接收关于所述SeNB和所述UE之间的空中接口连接丢失的指示；
部分基于从所述UE接收的ACK/NACK、PDCP/RLC分组传送状态信息和所述RLC分段信息来识别未从所述SeNB被发送到所述UE的剩余分组，所述剩余分组由于所述SeNB和所述UE之间的空中接口连接丢失而未从所述SeNB被发送到所述UE；以及
将所述剩余分组从所述MeNB发送到所述UE。
19.如权利要求18所述的方法，还包括：经由X2接口从所述SeNB接收所述PDCP/RLC分组传送状态信息和所述RLC分段信息。
20.如权利要求18所述的方法，还包括：
经由随机接入信道(RACH)从所述UE接收针对资源的请求，以使得所述UE能够将所述ACK发送到所述MeNB；或
从所述UE接收针对资源的请求以及上行链路数据，所述资源使得所述UE能够将所述ACK发送到所述MeNB。
21.包括多个指令的至少一种非暂态机器可读存储介质，所述多个指令适用于被执行来实现权利要求18的方法。
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