CN105265016A - 针对支持一个上行载波的终端的双重连接 - Google Patents

针对支持一个上行载波的终端的双重连接 Download PDF

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Publication number
CN105265016A
CN105265016A CN201380074047.6A CN201380074047A CN105265016A CN 105265016 A CN105265016 A CN 105265016A CN 201380074047 A CN201380074047 A CN 201380074047A CN 105265016 A CN105265016 A CN 105265016A
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small
interface
enb
cell enb
cell
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Inventor
张玉建
何宏
许允亨
摩-翰·方
姚丽娟
安娜·露西娅·宾涅洛
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Intel IP Corp
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Intel IP Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
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    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1854—Scheduling and prioritising arrangements
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    • H04L43/0823—Errors, e.g. transmission errors
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    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Computer Networks & Wireless Communication (AREA)
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  • Environmental & Geological Engineering (AREA)
  • Databases & Information Systems (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Telephonic Communication Services (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Computer And Data Communications (AREA)

Abstract

描述了针对仅具有单一上行链路分量承载能力的终端使得LTE系统中的双重连接成为可能的技术。双重连接指具有来自两个基站的服务小区的终端。在一种技术中，终端使用时分复用发送到宏小区和小小区。在另一个一种技术中，终端仅发送到宏小区或小小区中的一者。

Description

针对支持一个上行载波的终端的双重连接
优先权说明
本申请要求递交于2013年4月4日的美国临时专利申请序列号61/808,597的优先权，其通过引用整体合并于此。
技术领域
本文所述的实施例总体涉及无线网络和通信系统。
背景技术
已经提出的双重连接(dualconnection)，或EUTRANodeB间的载波聚合(CA)，用于LTE(长期演进)系统中的载波聚合的未来增强。载波聚合指的是在不同的频率处对多个载波的使用，称为分量载波(componentcarrier，CC)。针对每个分量载波存在服务小区，其中一个服务小区被指定为主小区(PCell)、并且其余服务小区被指定为次要(SCells)服务小区。在双重连接中，服务小区操作在不同的eNB(演进的节点B)中。eNB中的一个可以是宏小区eNB，而其他是小小区eNB。例如，主小区可以从宏小区来得到服务，并且次要小区可以从小小区得到服务。双重连接的主动机是为了避免异质部署中的频繁越区切换。
附图说明
图1示出的示例LTE系统的实体。
图2示出了移入宏小区的覆盖范围、且移入和移出两个小小区的覆盖范围的UE的示例。
图3示出了针对FDD的上行链路的时分复用的示例。
图4示出了针对TDD配置1的上行链路的时分复用的示例。
图5示出由于X2延迟导致的HARQ操作问题。
图6示出针对仅具有单一CCUE的双重连接的S1方案。
图7示出使用针对仅具有单一CCUE的双重连接的X1方案的UMRLC操作的示例。
图8示出示出使用针对仅具有单一CCUE的双重连接的X1方案的AMRLC操作的示例。
具体实施方式
图1示出了LTE系统的主网络实体，其中特定的实体可包括由后缀“a”标志到其标号的处理电路、由后缀“b”标志到其标号的网络接口、以及由后缀“c”标志到其标号的具有一根或多根天线的射频(RF)收发器。eNB(演进节点B)是向终端(称为用户设备(UE))提供一个或多个小区(称为地理区域)服务的基站。eNB105提供用于UE100的RF通信链路，有时也称为LTE无线电或空中接口。eNB针对其小区中的所有UE提供上行链路(UL)和下行链路(DL)数据信道，并且在UE和EPC(演进分组核心)之间中继数据流量。eNB还通过发送信令消息到UE来控制这些UE的低级操作。EPC的主要组件被示出为MME110(移动性管理实体)、HHS125(归属订户服务器)、S-GW115(服务网关)、P-GW120(分组数据网络(PDN)网关)。MME控制UE的高级操作，包括对移动性、通信会话、和安全性的管理。每个UE被分配到单一的服务MME，服务MME可能随着该UE的移动而改变。HSS是包含有关所有的网络运营商的订户的信息的中央数据库。P-GW是EPC与外部世界联系的点，并且与诸如互联网之类的一个或多个分组数据网络来交换数据。S-GW充当基站和P-GW之间的路由器。就像分配MME一样，每个UE被分配单一的服务S-GW，服务S-GW可能随着该UE的移动而改变。
空中接口提供UE与eNB之间的通信路径。网络接口提供eNB和EPC之间、以及EPC的不同组件之间的通信通路。网络接口包括eNB和MME之间的S1-MME接口、eNB和S-GW之间的的S1-U接口(本文简单地称为S1接口)、不同eNB之间的X2接口、不同的MME之间的接口S10、MME和HSS之间的S6a接口、S-GW和P-GW之间的S5/S8接口、以及P-GW和PDN之间的SGi接口。这些网络接口可以表示经由底层传输网络来传输的数据。在高层次上，图1中的网络实体以分组流(称为承载，其由具体协议来建立)的方式来跨其间的接口进行通信。UE和eNB使用数据无线电承载和信令无线电承载(SRB)两者来经由空中接口通信。eNB以相似命名的承载通过S1-U网络接口与S-GW通信、并且通过SL-MME网络接口与MME通信。数据无线电承载、S1-U承载、以及S5/S8承载的组合称为EPS(演进分组系统)承载。无论何时UE连接到PDN，EPC都设立称为默认承载的承载。UE可以随后收到称为专用承载的其它EPS承载。
LTE空中接口(也称为无线电接口或无线电接入网络(RAN))具有分层的协议体系结构，其中UE和eNB的对等层相互传递协议数据单元(PDU)，该PDU是下一个更高层的经封装的服务数据单元(SDU)。用户平面中的最顶层是发送和接收的IP(互联网协议)分组的分组数据压缩协议(PDCP)层。在UE与eNB之间的接入层中的控制平面中的最顶层是无线电资源控制(RRC)层。PDCP层经由IP分组所被映射到的无线电承载来与无线电链路控制(RLC)层通信。在介质访问控制(MAC)层，到上方的RLC层的连接是通过逻辑信道的，并且到下方的物理层的连接是通过传输信道的。MAC层处理逻辑信道之间复用/解复用、混合-ARQ操作、以及调度，后者在针对每个上行链路和下行链路的eNB处执行。传输信道中的数据被组织成传输块，(下文解释的)混合-ARQ功能相对于其在UE和eNB两者处来执行。用于数据传输的主传输信道、上行链路共享信道(UL-SCH)和下行链路共享信道(DL-SCH)，被在物理层处分别映射到物理上行链路共享信道(PUSCH)和物理下行链路共享信道(PDSCH)。
LTE使用前向纠错编码和ARQ(自动重复请求)的组合，称为混合ARQ或HARQ。混合ARQ使用前向纠错码来纠正一些错误。如该术语在本文中使用的，hybrid-ARQ确认或ACK可以是否定的确认(表示已经发生了发送错误并请求重传)、或者肯定的确认(指示已接收到传输)中的一者。HARQ功能在MAC层中操作。RLC层还具有这样的机制：该机制通过具有在接收器和发送器中的RLC实体之间操作的重传协议、来进一步提供数据到更高层的无差错递送。
LTE的物理层基于针对下行链路的正交频分复用(OFDM)和相关的技术、以及针对上行链路的单载波频分复用(SC-FDM)。在OFDM/SC-FDM中，根据诸如QAM(正交幅度调制)之类的调制方案的复调制符号被各自独立地映射到OFDM/SC-FDM符号中发送的特定的OFDM/SC-FDM子载波(称为资源元素(RE))。时域中的LTE传输被组织成每个都具有10ms的持续时间的无线电帧。每个无线电帧包括10个子帧，每个子帧由两个连续的0.5ms时隙组成。每个时隙包括用于扩展循环前缀的6个经索引的(indexed)OFDM符号、以及用于正常循环前缀的7个经索引的OFDM符号。对应于单一时隙中12个连续的子载波的一组资源元素称为资源块(RB)或参照物理层称为物理资源块(PRB)。在FDD(频分双工)操作(其中提供了用于上行链路和下行链路传输的单独的载波频率)的情况下，上文描述的帧结构同时适用于上行链路和下行链路而无需修改。在TDD(时分双工)操作中，子帧被分配用于上行链路或下行链路传输中的一者，而特殊子帧在从下行链路到上行链路传输的过渡处(但不是在从上行链路到下行链路传输的过渡处)出现。eNB在TDD操作期间管理针对每个无线电帧内的上行链路子帧和下行链路子帧的分配。
物理信道对应于用于特定传输信道的传输的时间-频率资源集合，并且每个传输信道被映射到对应的物理信道。也存在没有对应的传输信道的物理控制信道，其需要下行链路和上行传输信道的支持。这些包括物理下行链路控制信道(PDCCH)(eNB通过该信道来发送下行链路控制信息(DCI)给UE)、以及物理上行链路控制信道(PUCCH)(其将上行链路控制信息(UCI)从UE运送到eNB)。只要与本发明相关，由PDCCH运送的DCI可以包括向UE分配上行链路和下行链路资源的调度信息，而由PUCCH运送的UCI可以包括用于对由UE接收的传输块做出响应的混合ARQ确认。
双重连接
图2示出了这样的示例，其中在时刻t1UE100在宏小区内600的覆盖范围内移动，在时刻t2UE100在小小区650a的覆盖范围内移动，在时刻t3UE100移出小小区650a的覆盖范围，在时刻t4UE100在小小区650b的覆盖范围内移动，并且在时刻t5UE100移出小小区650b的覆盖范围。由于所有小小区的覆盖范围都比宏小区的覆盖范围更小，如果UE仅被连接到小小区则该UE需要越区切换到宏小区或其它小小区。另一方面，如果UE被连接到宏小区，则不要求越区切换但不能提供到小小区的卸载。因此，为了实现卸载并且避免频繁的越区切换，可以支持其中UE由宏小区和小小区两者提供服务的载波聚合。PCell可连接到宏小区并且SCell可连接到小小区。由于PCell负责移动性管理，则只要UE正在宏小区内移动该UE就不需要越区切换。此外，连接到小小区的SCell用于数据传输，并且UE可以利用至小小区的卸载。小小区650a到小小区650b的变化通过SCell添加/删除而不是越区切换来支持。在这种情况下，双重连接和常规的CA之间的主区别在于，宏小区以及小小区是由不同的eNB提供服务、且两个小区经由X2接口连接。在常规的CA中，假设所有服务小区由同一eNB提供服务。
上行链路能力是从UE的角度针对双重连接支持的最重要因素之一。UE的一种明确的选项是总是被要求具有ULCA能力，从而双重连接将得到支持。然而，ULCA通常引发针对UE的高复杂性的实现方式。两个Tx(发送)RF链显著地增加了UE的复杂性以及成本。此外，只要同时发生对多个CC的传输，就可以生成互调(inter-modulation)。下文讨论UE以单一ULCC能力支持双重连接的两种基本选项：1)UE以TDM方式发送到宏小区和小小区，以及2)UE只向一个小区(宏小区或小小区中的一个)进行发送。
经由TDM选项的双重连接
对于FDD的TDM选项的一个示例示于图3中。在此示例中，在8ms的时间段(即FDDULHARQ定时时间段)内，UE可以从宏小区接收子帧n/n+1/n+2中的DL传输，并据此在子帧n+4/n+5/n+6中向宏小区发送HARQ-ACK。同时，UE可以从小小区接收子帧n+4/n+5/n+6中的DL传输，并在子帧n/n+1/n+2中将HARQ-ACK反馈至小小区。对于UL传输，由于UE在子帧n+2之后交换传输频率，即使需要几百微秒来重调谐RF，但至少一个子帧也无法用于UL传输(如图2中的子帧n+3和n+7)。由于HARQ的时序关系，这些子帧也无法用于DL传输。这种RF重调谐子帧减少了用于DL和UL传输的可用子帧，因此，也降低了峰值数据速率和eNB的调度灵活性。
对于使用的TDM选项TDD模式，消除射频重调谐子帧的一种方法是将连续个UL子帧分组到相同的小区。用这种方式，UE可以使用其间的DL子帧来交换UL频率。由LTE规范定义的TDD配置1的示例示于图4中。UE在子帧#2和#3中发送到宏小区，并在子帧#7和#8中发送到小小区。针对DL，UE在子帧#5、#6和#9从宏小区接收，并且在子帧#0、#1和#4从小小区接收。
如果TDD模式与TDM被用来使UE到宏小区和小小区的双重连接成为可能，则小小区可以经由S1接口与S-GW进行通信。替代地，来自和去往S-GW、用于小小区的数据可以由宏小区经由X2接口进行中继。
经由UE传输到仅一个小区的双重连接
当UE只发送至一个小区(例如宏小区)时，该宏小区需要将HARQ-ACK/CSI信令经由可提供在不同eNB之间的X2接口转发到小小区。由当前LTE规范定义的、落后于HARQ过程的数量的关键原理是，HARQ过程的数目应涵盖最长HARQ往返时间(RTT)。由于当宏小区转发HARQ确认到小小区而引入的X2延时，所以HARQ过程的数目不足以覆盖增加的HARQRTT。针对HARQ-ACK，这样的延时可能对可实现的峰值数据速率存在影响。虽然DLHARQ是异步的，但存在根据双工模式的固定HARQ过程数目(在TDD的情况下，HARQ过程的数目还取决于DL/UL配置)。图5示出了FDD操作的问题。如果X2延迟延时小于3ms(并且不考虑在宏小区处用于HARQ-ACK的处理时间、以及在小小区处的调度时间)，则HARQ过程0的HARQ-ACK在子帧n+8之前在小小区处被接收。因此，小小区可以决定是否针对HARQ过程0在子帧n+8执行重传或发送新的数据。在这种情况下，峰值数据速率可以实现。然而，如果X2延迟延时迟大于3ms，则对于子帧n+8，针对所有HARQ过程的HARQ-ACK不由小小区来接收。因此，小小区不能对子帧n+8的做出调度决策。对于非理想的回程，预计典型X2延迟大于3ms，这意味着不能达到针对一个ULCC的DL的峰值数据速率。另一种观点是，由于延迟的HARQ-ACK，小小区不具有太大的调度灵活性。对于TDD，虽然TDD具有较长的HARQRTT，但影响是相同的。其原因是，由于HARQ过程的最大数目由最大HARQRTT确定，所以X2延迟增加最大HARQRTT。因此根据当前的LTE规范的HARQ过程的当前数量是不够的。
一种对X2延迟问题的解决方案到是增加DLHARQ过程的数目，以覆盖最大HARQRTT。目前在PDCCH中，指示HARQ过程的位的数目分别是3(对于FDD)和4(对于TDD)。对于FDD和TDD，位的数量分别可以扩展到m(m＞3)和n(n＞4)。作为特殊的情况，DCI(下行链路控制信息)格式1中用于标识HARQ过程的位的数目可以针对FDD和TDD分别增加到4和5。根据当前的LTE规范，那些值针对FDD和TDD分别是3和4，并且上述的改变将把HARQ过程的数量翻倍。类似的改变可以对其它DCI格式进行。
基本上有两种方案来路由由小小区处理的EPS载波。在第一种方案(可以称为S1的方案)中，小小区eNB一旦被宏eNB配置，就经由S1接口直接与S-GW进行通信。在第二种方案(可以称为X2的方案)中，宏eNB需要经由X2接口将数据转发到小小区eNB，并且宏eNB还需要能够从小小区eNB接收数据、并通过S1接口发送至S-GW。在下文描述的实施例中，假设该UE只传输到宏小区，并且宏小区转发必要的信息至小小区。UE也有可能只向小小区传输，并且小小区可以转发必要的信息给宏小区。在下文的说明中，那些实施例将涉及对宏小区和小小区的术语的简单交换。
对于S1方案，一种由宏小区将所接收的UL数据转发到小小区的方法如下。在宏小区接收UL数据之后，MAC层执行解复用，并且宏小区随后转发RLCPDU(协议数据单元)至小小区(如果必要的话)。对于UE100、宏小区eNB600、和小小区eNB650用于建立在宏小区eNB和UE之间的无线电承载1、和建立于小小区eNB和UE之间的无线电承载2的针对上行链路的RLC协议分割示于图6中。宏小区中的MAC层执行UL数据解复用。无线电承载1由宏小区直接处理，从而在解复用后，无线电承载1的RLCPDU被传递到宏小区的RLC层。对于无线电承载2，在MAC层解复用后，宏小区经由X2接口将RLCPDU转发到小小区。小小区随后处理RLC和PDCP层处理、并经由S1接口传输数据到S-GW。
在X2方案中，当所接收的数据与建立在小小区eNB和UE之间的无线电承载相关联时，宏小区eNB将通过S1接口从S-GW接收的数据通过X2接口转发至小小区eNB。当从小小区eNB接收的数据与建立在小小区eNB和UE之间的无线电承载相关联时，宏小区eNB还可以将通过X2接口从小小区eNB接收的数据通过S1接口转发至S-GW。
用于X2方案的实施例示出于图7中，图7示出了小小区eNB650、宏小区eNB600、UE100的RLC协议层。每个设备中的RLC协议层可以包括发送或接收RLC实体、并且经由逻辑信道与较下层通信且经由服务接入点(SAP)与较上层通信。存在三种类型的RLC实体：TM，UM和AM实体(分别针对透明模式、未确认模式和确认模式)。数据承载只能映射到UM或AMRLC实体。对于UMRLC实体，发送和接收实体能独立操作。因此宏小区可以提供对应于UE的UL发送UMRLC实体的接收UMRLC实体。UE提供对应于小小区的DL发送UMRLC实体的接收UMRLC实体。宏小区不是必须执行对UL承载(其与由小小区发送的DL承载相关联)的转发。宏小区处理从UE通过物理层、MAC层、RLC层和PDCP层的接收，随后传送该数据到S-GW。
对于AMRLC，在通信对等体内只存在一个AMRLC实体，且该AMRLC实体处理发送和接收两者。RLCPDU有两种类型：RLC数据PDU、和RLC控制PDU(即RLC状态PDU)。RLC数据PDU和RLC状态PDU两者都含有轮询位(P)字段，P字段指示AMRLC实体的发送侧是否从其对等AMRLC实体请求状态报告。为了在UL只有一个CC时启用AMRLC操作，宏小区eNB将从UE接收的轮询位和RLC状态PDU经由X2接口转发至小小区eNB。一个示例示于图8中，图8示出了针对小小区eNB650、宏小区eNB600、和UE100的RLC协议层，其中RLC协议层经由逻辑信道与较下层通信且经由服务接入点(SAP)与较上层通信。UE和小小区的RLC层包括对应的AMRLC实体，并且宏小区的RLC层包括用于将RLC状态PDU和轮询位从UE转发至小小区的AMRLC实体的RLC实体。宏小区还处理来自UE的RLC数据PDU、并将它们传递到PDCP层用于进一步处理。宏小区的RLC实体还可以处理某些的RLC功能，例如RLC头部的处理和重新排序。另一方面，存在三个RLC定时器：t-PollRetransmit、t-Reordering、和t-StatusProhibit。所有三个定时器的值可以以RRC信令来配置。附加值可被添加到这些计时器以便适应X2接口延时。
对示例的附加说明
在示例1中，一种用于将演进节点B(eNB)作为LTE(长期演进)网络中的宏小区来进行操作的方法，包括：
经由X2接口与作为用户设备(UE)的辅小区的小小区eNB进行通信；以时分双工(TDD)模式作为UE的主小区来进行操作；并且以允许UE在下行链路(DL)子帧期间切换上行链路(UL)载波频率的方式，在第一分量载波上在UE和宏小区eNB之间、并在第二分量载波上在UE和小小区eNB之间分配DL子帧和UL子帧。
在示例2中，示例1的主题可选地包括：连续将UL子帧分组到宏小区、并连续将UL子帧与DL子帧相间地分组到小小区eNB，以允许UE使用UL子帧之间的DL子帧来切换UL载波频率。
在示例3中，示例1的主题可选地包括：中继来自和去往小小区eNB的服务网关(S-GW)的数据。
在示例4中，一种用于将演进节点B(eNB)作为LTE(长期演进)网络中的宏小区来进行操作的方法，包括：当小小区eNB作为用户设备(UE)的辅小区操作时、并且当针对所述UE在辅小区上的上行链路传输不被允许时，作为所述UE的主小区进行操作；经由X2接口将HARQ(混合自动重复请求)确认和CSI(信道状态信息)报告从UE转发到小小区eNB；并且在MAC(介质访问控制)层从所述UE接收到包括与建立在所述UE和所述小小区eNB之间的无线电承载相关联的无线电链路控制(RLC)协议数据单元(PDU)的数据之后，经由X2接口将所述RLCPDU转发到所述小小区eNB。
在示例5中，示例4的主题可选地包括：利用频分双工(FDD)模式的4位HARQ过程号字段和/或时分双工(TDD)模式的5位HARQ过程号字段在PDCCH(物理下行链路控制信道)中发送DCI(下行链路控制信息)。
在示例6中，示例5的主题可选地包括：针对所述FDD模式提供16个HARQ过程和/或针对TDD模式提供30个HARQ过程。
在示例7中，一种用于将演进节点B(eNB)作为LTE(长期演进)网络中的宏小区来进行操作的方法，包括：当小小区eNB作为用户设备(UE)的辅小区操作时、并且当所述UE在辅小区上的上行链路传输不被允许时，作为所述UE的主小区进行操作；并且当经由S1接口从S-GW(服务网关)接收的数据与建立在所述UE和所述小小区eNB之间的无线电承载相关联时，将经由S1接口从S-GW(服务网关)接收的数据经由X2接口转发至所述小小区eNB。
在示例8中，示例7的主题可选地包括：当经由X2接口从所述小小区eNB接收的数据与建立在所述UE和所述小小区eNB之间的无线电载波相关联时，将经由X2接口从所述小小区eNB接收的数据经由S1接口转发至所述S-GW。
在示例9中，示例7的主题可选地包括：当所述小小区eNB正在以RLC确认模式向所述UE发送时，经由X2接口将RLC状态PDU从所述UE转发至所述小小区eNB。
在示例10中，示例7的主题可选地包括：当所述小小区eNB正在以RLC确认模式向所述UE发送时，经由X2接口将具有轮询位的RLC数据PDU从所述UE转发至所述小小区eNB。
在示例11中，示例7的主题可选地包括：利用频分双工(FDD)模式的4位HARQ过程号字段和/或时分双工(TDD)模式的5位HARQ过程号字段在PDCCH(物理下行链路控制信道)中传输DCI(下行链路控制信息)。
在示例12中，示例7的主题可选地包括：针对所述FDD模式提供16个HARQ过程和/或针对TDD模式提供30个HARQ过程。
在示例13中，一种用于操作用户设备(UE)的方法，包括：与作为用于第一分量载波的主小区的宏小区演进节点B(eNB)进行通信；与作为用于第二分量载波的辅小区的小小区演进节点B(eNB)进行通信；在时分双工(TDD)模式中，接收对在第一分量载波上在UE和宏小区eNB之间、以及在第二分量载波上在UE和小小区eNB之间的DL子帧和UL子帧的分配；并且在DL子帧期间切换UL载波频率。
在示例14中，示例13的主题可选地包括：接收对连续分组到所述宏小区eNB的UL子帧以及连续分组到所述小小区eNB的UL子帧的分配。
在示例15中，示例13的主题可选地包括：接收对连续分组到所述宏小区eNB的UL子帧、以及和DL子帧相间地连续分组到所述小小区eNB的UL子帧的分配，以允许UE使用UL子帧之间的DL子帧来切换UL载波频率。
在示例16中，一种用于操作用户设备(UE)的方法，包括：与作为用于上行链路(UL)和下行链路(DL)传输两者的主小区的宏小区演进节点B(eNB)进行通信；以及与作为用于DL传输、但不用于UL传输的辅小区的小小区eNB进行通信。
在示例17中，示例16的主题可选地包括：利用频分双工(FDD)模式的4位HARQ过程号字段和/或时分双工(TDD)模式的5位HARQ过程号字段在PDCCH(物理下行链路控制信道)中传输DCI(下行链路控制信息)。
在示例18中，示例16的主题可选地包括：针对所述FDD模式提供16个HARQ过程和/或针对TDD模式提供30个HARQ过程。
在示例19中，一种用于作为LTE(长期演进)网络中的宏小区来进行操作的演进节点B(eNB)，包括：与用户设备(UE)进行通信的无线电接口；用于与小小区eNB进行通信的X2接口；其中处理电路用作执行示例1-12所述的任意方法。
在示例20中，一种用户设备(UE)包括：无线收发器和处理电路，其中处理电路用作执行示例13-18所述的任意方法。
在示例21中，提供了一种包含指令的计算机可读介质，所述指令用于执行示例1-18所述的任意方法。
以上详细描述包括对附图的引用，其构成的详细描述的一部分。附图以说明性的方式示出了可以实施的具体实施例。这些实施例也在本文中称为“示例”。这样的示例可以包括除了那些示出或描述的元素之外的元素。然而同样考虑示例包括所示出或描述的元素。此外，或者对于所示出或描述的特定示例(或一个或多个方面)、或者对于所示出或描述的其它示例(或一个或多个方面)，也考虑示例使用所示出或描述的元素(或其一个或多个方面)的任何组合或置换。
本文件中提及的出版物、专利和专利本文件都通过引用整体并入本文，就像通过引用单独并入一样。在本文件和这些通过引用而并入的文件出现不一致用法的情况下，所并入的(一个或多个)文件中的用法服从于本文件中的用法；针对不可调和的矛盾，本文档中的使用来进行控制。
在本文件中，术语“一”或“一个”的使用方式与常见的专利文件中的相同，包括一个或一个以上的，独立于“至少一个”、“一个或多个”的任何其它实例或使用。在这份文件中，术语“或”用于指非排它或，使得“A或B”包括“A而不含B”、“B而不含A”、以及“A和B”，除非另有说明。在所附权利要求中，术语“包括”和“其中”被用作相应术语“包含”和“其中有”的惯用英语等同物。另外，在下面的权利要求中，“包括”和“包含”的术语是开放式的，即系统、设备、物品或过程所包括的元素，除了那些在权利要求中这样的术语后列出的元素之外的元素仍被认为是落入该权利要求的范围之内。此外，在下面的权利要求中，术语“第一”、“第二”和“第三”等是只用作标记，并不意图暗示对于它们的对象的数值顺序。
如上所述的实施例可以在各种硬件配置中实现，其可包括用于执行实现本文描述的技术的指令的处理器。这样的指令可以被包含在机器可读介质中，例如合适的存储介质或存储器或其它处理器可执行介质。
如本文所述的实施例可以在多种环境中实现，例如无线局域网络(WLAN)、第三代合作伙伴计划(3GPP)通用地面无线电接入网络(UTRAN)、长期演进(LTE)或长期演进(LTE)通信系统，但本发明的范围不限于这一方面。示例LTE系统包括与基站(由LTE规范定义为eNodeB)通信的多个移动站(由LTE规范定义为用户设备(UE))。
本文提及的天线可包括适合对RF信号的传输的一个或多个定向或全向天线，包括例如偶极天线、单极天线、贴片天线、环形天线、微带天线或其它类型的天线。在一些实施例中，可以使用具有多个孔径的单个天线、而不是两个或更多个天线。在这些实施例中，每个孔径可以被认为是一个单独的天线。在一些多输入多输出(MIMO)实施例中，天线可以被有效地分离以利用空间多样性和不同的信道特性的优势，其可在每个天线和发送站的天线之间得到结果。在一些MIMO实施例中，天线可通过多达波长的1/10或更高来分离。
在一些实施例中，如本文所述的接收器可以被配置为按照特定的通信标准接收信号，例如电气学会和电子工程师协会(IEEE)标准(包括IEEE802.111-2007和/或802.11(n)的标准和/或针对无线局域网提议的规范)，但本发明的范围并不局限于这个方面，因为接收器也可以适于根据其它技术和标准发送和/或接收通信。在一些实施例中，接收器可以被配置为根据针对无线城域网(WLAN)的IEEE802.16-2004、IEEE802.16(e)和/或IEEE802.16(m)标准(包括其变型和演变物)来接收信号，尽管本发明的范围并不局限于这个方面，因为它们也可以接收器也可以适于根据其它技术和标准发送和/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络(UTRAN)的LTE通信标准来接收信号。欲了解对于IEEE802.11和IEEE802.16标准的更多信息，请参考“信息技术-系统间通信和信息交换IEEE标准”-局域网-特殊要求-第1部分1“无线局域网媒体访问控制(MAC)和物理层(PHY)、ISO/IEC8802-11：1999“，以及城域网-特殊要求-第16部分：“空中接口的固定宽带无线接入系统“，2005年5月和相关的修订/版本。欲了解UTRANLTE标准的详细信息，请参见第三代合作伙伴计划(3GPP)标准UTRAN-LTE版本8，2008年3月，包括其变化和演进体。
以上的描述旨在是说明性的，而不是限制性的。例如，上述实施例(或其一个或多个方面)可以与其它实施例或方面组合使用。例如在本领域技术人员其它实施例可以在检查上述说明之后使用其它实施例。提供的摘要符合美利坚合众国37C.F.R.部分1.72(b)的规定：摘要将允许读者确定本技术公开的性质和要点。应当理解它将不被用于限制或解释权利要求的范围或含义。另外在上述详细说明中，各种特征可以被分组在一起以精简本公开。然而，由于实施例的特征可以在于这些特征的子集，权利要求书可能不阐述本文中公开的所有特征。此外，实施例可以包括比在一个具体的实例中公开的特征更少。此外，实施例可以包括比在具体的实例中公开的特征更少的特征。因此，所附权利要求在此被合并到具体实施方式中，其中每个权利要求自身作为单独的实施例。本文所公开的实施例的范围应参照所附权利要求、以及有资格作为这些权利要求的等同物的所有范围来确定。

Claims (20)

1.一种用于将演进节点B(eNB)作为LTE(长期演进)网络中的宏小区进行操作的方法，包括：
经由X2接口与用作用户设备(UE)的辅小区的小小区eNB进行通信；
以时分双工(TDD)模式作为所述UE的主小区进行操作；以及
以允许所述UE在下行链路(DL)子帧期间切换上行链路(UL)载波频率的方式，在第一分量载波上在所述UE和所述宏小区eNB之间、并在第二分量载波上在所述UE和所述小小区eNB之间分配DL子帧和UL子帧。
2.如权利要求1所述的方法，还包括：连续将UL子帧分组到所述宏小区、并连续将UL子帧与DL子帧相间地分组到所述小小区eNB，以允许所述UE使用所述UL子帧之间的DL子帧来切换UL载波频率。
3.如权利要求1所述的方法，还包括：中继来自和去往所述小小区eNB的服务网关(S-GW)的数据。
4.一种用于将演进节点B(eNB)作为LTE(长期演进)网络中的宏小区进行操作的方法，包括：
当小小区eNB作为用户设备(UE)的辅小区进行操作时、并且当所述UE在所述辅小区上的上行链路传输不被允许时，作为所述UE的主小区进行操作；以及
当通过S1接口从S-GW(服务网关)接收的数据与建立在所述UE和所述小小区eNB之间的无线电承载相关联时，将通过所述S1接口从所述S-GW接收的数据通过X2接口转发至所述小小区eNB。
5.如权利要求4所述的方法，还包括：当通过所述X2接口从所述小小区eNB接收的数据与建立在所述UE和所述小小区eNB之间的无线电承载相关联时，将通过所述X2接口从所述小小区eNB接收的数据通过所述S1接口转发至所述S-GW。
6.如权利要求4所述的方法，还包括：当所述小小区eNB正在以RLC确认模式向所述UE发送时，通过所述X2接口将RLC状态PDU从所述UE转发至所述小小区eNB。
7.如权利要求4所述的方法，还包括：当所述小小区eNB正在以RLC确认模式向所述UE发送时，通过所述X2接口将具有轮询位的RLC数据PDU从所述UE转发至所述小小区eNB。
8.如权利要求4所述的方法，还包括：利用频分双工(FDD)模式的4位HARQ过程号字段，在PDCCH(物理下行链路控制信道)中发送DCI(下行链路控制信息)。
9.如权利要求8所述的方法，还包括：针对所述FDD模式提供16个HARQ过程。
10.如权利要求4所述的方法，还包括：利用时分双工(TDD)模式的5位HARQ过程号字段，在PDCCH(物理下行链路控制信道)中发送DCI(下行链路控制信息)。
11.如权利要求10所述的方法，还包括：针对所述TDD模式提供30个HARQ过程。
12.一种用于作为LTE(长期演进)网络中的宏小区进行操作的演进节点B(eNB)，包括：
无线电接口，所述无线电接口用于与用户设备(UE)进行通信；
X2接口，所述X2接口用于与用作所述UE的辅小区的小小区eNB进行通信；
其中，处理电路：
当所述UE在所述辅小区上的上行链路传输不被允许时，作为所述UE的主小区进行操作；
经由所述X2接口将HARQ(混合自动重复请求)确认和CSI(信道状态信息)报告从所述UE转发至所述小小区eNB；并且
在MAC(介质访问控制层)从所述UE接收到包括与建立在所述UE和所述小小区eNB之间的无线电承载相关联的RLC(无线电链路控制)PDU(协议数据单元)的数据之后，通过所述X2接口将所述RLCPDU转发至所述小小区eNB。
13.如权利要求12所述的eNB，其中，所述处理电路利用频分双工(FDD)模式的4位HARQ过程号字段，在PDCCH(物理下行链路控制信道)中发送DCI(下行链路控制信息)。
14.如权利要求13所述的eNB，其中，所述处理电路针对所述FDD模式提供16个HARQ过程。
15.一种用于作为LTE(长期演进)网络中的宏小区进行操作的演进节点B(eNB)，包括：
无线电接口，所述无线电接口用于与用户设备(UE)进行通信；
X2接口，所述X2接口用于与用作所述UE的辅小区的小小区eNB进行通信；
其中，处理电路：
当所述小小区eNB作为所述UE的辅小区进行操作时、并且当所述UE在所述辅小区上的上行链路传输不被允许时，作为所述UE的主小区进行操作；
当通过S1接口从S-GW(服务网关)接收的数据与建立在所述UE和所述小小区eNB之间的无线电承载相关联时，将通过所述S1接口从所述S-GW接收的数据通过所述X2接口转发至所述小小区eNB。
16.如权利要求15所述的eNB，其中，所述处理电路在通过所述X2接口从所述小小区eNB接收的数据与建立在所述UE和所述小小区eNB之间的无线电承载相关联时，将通过所述X2接口从所述小小区eNB接收的数据通过所述S1接口转发至所述S-GW。
17.如权利要求15所述的eNB，其中，所述处理电路在所述小小区eNB正在以RLC确认模式向所述UE发送时，通过所述X2接口将RLC状态PDU从所述UE转发至所述小小区eNB。
18.如权利要求15所述的eNB，其中，所述处理电路在所述小小区eNB正在以RLC确认模式向所述UE发送时，通过所述X2接口将具有轮询位的RLC数据PDU从所述UE转发至所述小小区eNB。
19.如权利要求15所述的eNB，其中，所述处理电路利用频分双工(FDD)模式的4位HARQ过程号字段，在PDCCH(物理下行链路控制信道)中发送DCI(下行链路控制信息)。
20.如权利要求15所述的eNB，其中，所述处理电路针对FDD模式提供16个HARQ过程。
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