CN102647264A - 在移动通信系统中发送响应信息的方法 - Google Patents
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Abstract
公开了一种用于在移动通信系统中发送响应信息的方法。该方法包括接收来自多个UE的随机接入信道(RACH)前导以及通过公共信道发送与接收到的前导相关的响应信息,其中该多个UE可以接入公共信道并且接收相应的信息。如果UE在使用所分配的上行链路无线电资源通过RACH将数据发送到eNode-B时使用HARQ方案,那么eNode-B不会预先分配重新发送所需的上行链路无线电资源,而是执行用于HARQ的第一传输的无线电资源的分配。如果需要重新发送,那么eNode-B用NACK信号来分配重新发送所需的无线电资源。如果不需要重新发送,本发明可以降低被浪费的无线电资源的量。
Description
本申请是申请日为2007年2月7日,申请号为200780004856.4(PCT/KR2007/000654),发明名称为“在移动通信系统中发送响应信息的方法”的申请的分案申请。
技术领域
本发明涉及一种移动通信系统,并且,具体地涉及一种在移动通信系统中发送响应信息的方法。
背景技术
图1是图示作为移动通信系统的长期演进(LTE)系统的结构图。LTE系统是常规UMTS系统的演进版本且已被3GPP(第三代合作伙伴项目)标准化。
LTE网络一般可以分为演进UMTS地面无线电接入网络(E-UTRAN)和核心网络(CN)。E-UTRAN包括充当基站的eNode-B和位于网络末端以便其连接到外部网络的接入网关(AG)。
AG可以分为用于处理用户业务(traffic)的部分和用于处理控制业务的部分。用于处理用户业务的AG部分和用于处理控制业务的AG部分可以通过新接口来相互连接以便进行通信。eNode-B中可以存在一个或多个小区。eNode-B可以通过接口来连接以便传输用户业务或控制业务。
CN包括AG和用于登记用户设备(UE)的用户的节点。也可以在E-UMTS中提供接口以便区分EUTRAN和CN。
无线电接口协议层可以基于本领域中公知的开放式系统互连(OSI)参考模型的三个低层被分为第一层(L1)、第二层(L2)、和第三层(L3)。第一层(L1)的物理层通过物理信道提供信息传递服务。位于第三层(L3)的无线电资源控制(RRC)层控制UE与网络之间的无线电资源。
为此目的,RRC层在UE与网络之间交换RRC消息。RRC层可以被分布到多个网络节点,诸如eNode-B和AG,也可以位于eNode-B或AG处。
图2是图示基于3GPP无线电接入网络标准的UTRAN(UMTS地面无线电接入网络)与UE之间的无线电接口协议结构的控制平面的示意图。无线电接口协议在水平方向上表现为物理层、数据链路层和网络层。无线电接口协议在垂直方向上表现为用于发送数据的用户平面和用于发送控制信号的控制平面。
图2的协议层可以被分为物理层、媒体访问控制(MAC)层、无线电链路控制(RLC)层和无线电资源控制(RRC)层。
作为第一层的物理层通过物理信道向上层提供信息传递服务。物理层经由传送信道被连接到位于其之上的媒体访问控制(MAC)层。
MAC层通过传送信道来与物理层通信,以便在MAC层与物理层之间传送数据。数据在不同的物理层之间被传送,例如在发送侧的第一物理层与接收侧的第二物理层之间被传送。
第二层(L2)的MAC层通过逻辑信道将各种服务发送到作为其上层的RLC(无线电链路控制)层。第二层(L2)的RLC层支持可靠的数据传输。
应注意到RLC层是以虚线绘出的,因为如果RLC功能实现在MAC层中并由MAC层执行,则RLC层本身不需要存在。
位于第三层(L3)的最低部分的RRC(无线电资源控制)层仅由控制平面来定义。RRC层控制逻辑信道、传送信道和物理信道以便进行无线电承载(RB)的配置、重配置和释放。RB表示用于UE与E-UTRAN之间的数据传递的由第二层(L2)提供的服务。
图3是图示根据3GPP无线电接入网络标准的UTRAN与UE之间的无线电接口协议结构的用户平面的示意图。无线电协议用户平面分为物理层、MAC层、RLC层和PDCP(分组数据汇聚协议)层。
第一层(L1)的物理层和第二层(L2)的MAC和RLC层用于以相对窄的带宽、通过无线电接口、使用诸如IPv4或IPv6的IP分组来有效地发送数据。PDCP层执行报头压缩以减小包含不必要控制信息的相对大的IP分组报头的尺寸。
下文中将详细描述用于在网络与UE之间发送数据的上行链路和下行链路信道。下行链路信道将数据从网络发送到UE。上行链路信道将数据从UE发送到网络。
下行链路信道的示例是用于发送系统信息的广播信道(BCH)和用于发送用户业务或控制消息的下行链路共享信道(SCH)和共享控制信道(SCCH)。下行链路多播服务或广播服务的用户业务和控制消息可以通过下行链路共享信道(SCH)来发送或者可以通过另外的多播信道(MCH)来发送。
上行链路信道的示例是随机接入信道(RACH)和用于发送用户业务或控制消息的上行链路共享信道(SCH)和共享控制信道(SCCH)。
图4是图示混合自动重传请求(HARQ)方案的示意图。将参照图4来描述用于在无线电分组通信系统的下行链路物理层中实现HARQ的方法。
参照图4,eNode-B确定要接收分组的UE和要被发送到UE的分组的类型,诸如编码率、调制方案和数据量。eNode-B通过高速下行链路共享控制信道(HS-SCCH)将确定的信息告知UE,以及在与通过HS-SCCH来发送信息相关的时间经由高速下行链路共享信道(HS-DSCH)来发送相应的数据分组。
UE接收下行链路控制信道、识别要被发送的分组类型和传输时间点,以及接收相应的分组。UE随后试图解码接收到的分组数据。
如果UE未能解码诸如数据1的特定分组,那么UE将否定确认(NACK)信号发送到eNode-B。eNode-B识别到分组传输已经失败并在适当的时间点使用相同的分组格式或新的分组格式来重新发送诸如数据1的相同数据。UE将诸如数据1的重新发送的分组与分组解码失败的之前接收到的分组结合,并且重新尝试分组解码。
如果分组被接收到且被成功解码,则UE将确认(ACK)信号发送到eNode-B。eNode-B识别成功的分组传输并且执行诸如数据2的下一个分组的传输。
随机接入信道(RACH)指示用于将初始控制消息从UE发送到网络的信道。RACH适于实现UE与网络之间的同步。此外,如果期望在上行链路方向上发送数据的UE中没有留下更多用于发送的数据,那么该UE可以通过RACH来获取必要的无线电资源。
例如,当UE被加电时,其试图接入新的小区。UE执行下行链路同步以及接收来自UE期望的目标小区的系统信息。
在接收到系统信息时,UE必须发送接入请求消息以接入RRC层。但是,由于UE使用RACH,所以其不与当前网络同步并且没有上行链路无线电资源的保证。
换言之,UE请求能够将接入请求信息发送到网路的无线电资源。如果eNode-B接收到来自UE的无线电资源请求信号,则其将适当的无线电资源分配给UE,以供其发送RRC连接请求消息。UE随后可以使用所分配的无线电资源将RRC连接请求消息发送到网络。
在另一个示例中,假设是在UE与网络之间建立了RRC连接。UE根据网络的无线电资源调度处理来接收来自网络的无线电资源,以便使用无线电资源将来自UE的数据发送到网络。
但是,如果UE的缓冲器中没有留下更多用于发送的数据,则网络不再向UE分配上行链路无线电资源。如果网络向UE分配上行链路无线电资源,则这种分配被认为是无效的。UE的缓冲器状态被周期性地或偶然地报告给网络。
因此,如果新的数据被存储在没有无线电资源的UE的缓冲器中,则由于没有向UE分配上行链路无线电资源,所以UE利用RACH。换言之,UE请求用于将数据发送到网络所需的无线电资源。
下文中将详细描述在宽带码分多址(WCDMA)系统中使用的RACH。RACH用于较短长度的数据的传输。通过RACH来发送诸如RRC连接请求消息、小区更新消息、和URA更新消息之类的一些RRC消息。
多个逻辑信道可以被映射到RACH。例如,公共控制信道(CCCH)、专用控制信道(DCCH)、和专用业务信道(DTCH)可以被映射到RACH。RACH被映射到物理随机接入信道(PRACH)。
图5是图示PRACH(物理随机接入信道)传输方法的示例的示意图。如图5所示,作为上行链路物理信道的PRACH被分成前导部分和消息部分。
前导部分执行用于调节发送消息所需的功率的功率斜坡(power-ramping)功能和用于防止来自多个UE的传输相互冲突的防冲突功能。消息部分执行MAC协议数据单元(MAC PDU)的从MAC层到物理信道的传输。
如果UE的MAC层指示UE的物理层发送PRACH传输,那么UE的物理层选择单个接入时隙(access slot)和单个签名并在上行链路中发送PRACH前导。前导可以在1.33ms的接入时隙期间内被发送并且在接入时隙的初始预定期间内从16个签名之中选择单个签名,以便其可以发送所选择的签名。
当UE发送前导时,eNode-B可以通过作为下行链路物理信道的捕获指示信道(AICH)来发送响应信号。eNode-B使用通过AICH发送的响应信号将肯定响应(ACK)或否定响应(NACK)发送到UE。
如果UE接收到ACK响应信号,则其发送消息部分。如果UE接收到NACK响应信号,则UE的MAC层指示UE的物理层在预定的时间之后执行PRACH的重新发送。如果UE没有接收到与所发送的前导对应的响应信号,则其在指定的接入时隙之后以比之前的前导的功率级高一级的功率级来发送新的前导。
虽然上述说明已经公开了RACH前导的响应信号,但应注意到,eNode-B可以将数据或控制信号发送到UE。存在从eNode-B发送到UE的多种控制信号,诸如下行链路调度信息、上行链路调度许可信息、和与UE的RACH前导传输相关的响应信息。
发明内容
技术问题
根据常规技术,当UE通过RACH来发送数据时,其将RACH前导发送到eNode-B,并且eNode-B将与该RACH前导相关的响应信息发送到UE。但是,如果至少两个UE在相同或类似的时间发送其RACH前导以使用RACH,那么eNode-B必须将与各个前导有关的相关响应信息告知两个UE中的每一个,由此需要用于将响应信息发送到每个UE的无线电资源的分配且浪费无线电资源。
假如UE在使用所分配的无线电资源通过RACH将数据发送到eNode-B时使用HARQ方案,则eNode-B不仅预先分配与初始发送数据相关的第一无线电资源,而且预先分配与重新发送数据相关的第二无线电资源。因此,如果UE在第一传输时间成功地发送了数据,则不必要地浪费了用于重新发送数据的第二无线电资源。
技术方案
本发明的目的是提供一种用于在移动通信系统中发送响应信息的方法,其降低了被浪费的无线电资源的量且有效地使用无线电资源。本发明的另一个目的是提供移动通信系统,当两个或更多个UE已在相同或类似的时间发送了RACH前导时,该移动通信系统不分别发送与UE相关的响应信息,而是将RACH前导响应信息发送到特定UE、在公共信道上以单个数据单元的形式来配置相关的响应信息,并将经配置的数据单元发送到特定UE。
在本发明的一个方面中,提供了一种方法,其用于在移动通信系统中发送特定前导以及接收响应于该特定前导的信息。该方法包括通过随机接入信道(RACH)来发送特定前导、通过公共信道来接收响应信息,该响应信息包括至少一个响应和与该至少一个响应对应的标识信息,该至少一个响应与在特定时间间隔内被发送的至少一个前导对应,该方法还包括如果标识信息指示该至少一个响应与该特定前导对应,则处理该至少一个响应。
可以预期该方法进一步包括:如果标识信息指示该至少一个响应与该特定前导对应,则使用在该至少一个响应中分配的无线电资源来发送数据。可以预期该方法进一步包括:接收包括没有正确地接收到所发送数据的指示的第一消息,以及使用新分配的无线电资源来重新发送数据。
可以预期该第一消息包括新分配的无线电资源。可以进一步预期,该方法进一步包括接收包括新分配的无线电资源的第二消息。优选地,公共信道是下行链路共享信道(DL-SCH)。
在本发明的另一方面,提供了一种方法,其用于在移动通信系统中发送前导以及接收响应于该前导的信息。该方法包括在特定时间间隔内通过随机接入信道(RACH)来接收至少一个前导以及通过公共信道来发送响应信息,该响应信息包括与在特定时间间隔内接收到的至少一个前导对应的响应和标识从其接收了该至少一个前导的移动通信终端的标识信息。
可以预期该方法进一步包括在响应中分配无线电资源,该无线电资源与从移动通信终端发送数据相关,从该移动通信终端接收了所述至少一个前导。可以进一步预期,该方法进一步包括:接收来自从其接收了至少一个前导的移动通信终端的数据,该数据是用所分配的无线电资源发送的;确定没有正确地接收到数据;发送包括与重新发送数据相关的另外分配的无线电资源的第一消息;以及接收使用在该消息中分配的无线电资源而重新发送的数据。
可以预期该方法进一步包括:将没有正确地接收到数据的指示包括在第一消息中。可以进一步预期,该方法进一步包括:发送包括没有正确地接收到数据的指示的第二消息。优选地,公共信道是下行链路共享信道(DL-SCH)。
在本发明的另一方面中,提供了一种方法,其用于在移动通信系统中发送特定前导以及接收响应于该特定前导的信息。该方法包括:特定移动通信终端通过随机接入信道(RACH)来发送特定前导;网络通过公共信道来发送响应信息,该响应信息包括与在特定时间间隔内接收到的至少一个前导对应的响应和标识从其接收了该至少一个前导的移动通信终端的标识信息;特定移动通信终端接收响应信息;以及如果标识信息指示该至少一个响应与该特定前导对应,那么特定移动通信终端处理该至少一个响应。
可以预期该方法进一步包括:网络将无线电资源分配在响应中,该无线电资源与从移动通信终端来发送数据相关,从该移动通信终端接收了所述至少一个前导。可以进一步预期,该方法进一步包括:如果标识信息指示所述至少一个响应与所述特定前导对应,那么特定移动通信终端使用在该至少一个响应中分配的无线电资源来发送数据。
可以预期该方法进一步包括:网络接收来自从其接收了所述至少一个前导的移动通信终端的数据,该数据是使用所分配的无线电资源发送的;网络确定没有正确地接收到该数据;网络发送包括与重新发送该数据相关的另外分配的无线电资源的第一消息;特定移动通信终端使用在第一消息中分配的无线电资源来重新发送数据;以及网络接收使用在该消息中分配的无线电资源而重新发送的数据。可以进一步预期,该方法进一步包括:网络将没有正确地接收到数据的指示包括在第一消息中。
可以预期该方法进一步包括:网络发送包括没有正确地接收到数据的指示的第二消息。可以进一步预期,公共信道是下行链路共享信道(DL-SCH)。
本发明的其它特征和优点将在后面的描述中得到阐述,并部分地将通过该描述变得明显,或者可以通过对本发明的实践而被了解。应理解的是,本发明的前述一般描述及后面的详细描述都是示范性和解释性的,并且意欲提供对要求保护的本发明的进一步解释。
根据参照附图的实施例的以下详细描述,对于本领域的技术人员来说,这些及其它实施例将变得明显,本发明不限于公开的任何特定实施例。
附图说明
附图被包括以提供对本发明的进一步理解,且被并入本说明书并构成本说明书的一部分,其图示本发明的实施例并与描述一起用来解释本发明的原理。在不同附图中用相同的标记引用的本发明的特征、元素和方面表示依照一个或多个实施例的相同、等价、或类似的特征、元素或方面。
图1是图示作为移动通信系统的长期演进(LTE)系统的结构图。
图2是图示无线电接口协议的控制平面的每个层的示意图。
图3是图示无线电接口协议的用户平面的每个层的示意图。
图4是图示混合ARQ(HARQ)方案的示意图。
图5是图示PRACH(物理随机接入信道)传输方法的示例的示意图。
图6是图示根据本发明的一个实施例、用于在移动通信系统中发送响应信息的方法的流程图。
图7图示根据本发明的一个实施例、用于通过公共信道将响应信息发送到UE的方法的示意图。
图8图示根据本发明的另一实施例、用于在移动通信系统中发送响应信息的方法的流程图。
图9图示根据本发明的另一实施例、用于在移动通信系统中发送响应信息的方法的流程图。
具体实施方式
现在将详细参照本发明的优选实施例,其示例在附图中示出。只要可能,相同的附图标记将在全部附图中用来表示相同或类似部分。
下文中将参照附图描述根据本发明的用于在移动通信系统中发送响应信息的方法。为方便描述和更好地理解本发明,术语“UE”将用来指示上行链路信号的发送实体,并且术语“eNode-B”将用来指示上行链路信号的接收实体。但是,应注意到,终端和基站的范围不局限于上述术语,并且术语“UE”和术语“eNode-B”还可以分别用来指示终端和基站。
图6是图示根据本发明的一个实施例、用于在移动通信系统中发送响应信息的方法的流程图。下文中将描述用于在某个时间发送与至少一个UE的前导发送相关的响应信息的方法。
UE使用RACH来执行RRC连接请求、小区更新、移交、上行链路无线电资源请求和与eNode-B相关的同步的保持。UE在发送数据之前发送前导。该前导用于调节数据发送所需的发送功率以及防止多个UE相互冲突。
当UE使用RACH时,UE将RACH前导发送到eNode-B,并且eNode-B将RACH前导响应信息发送到UE。eNode-B不独立地发送与其它UE相关的响应信息(其中其他UE中的每一个均在相同或类似的时间发送RACH前导),而是通过公共信道同时发送与其它UE相关的响应信息。
例如,如果第一UE、第二UE和第三UE在预定时间期间内将其RACH前导发送到eNode-B,那么eNode-B以单个数据单元的形式配置与第一至第三UE相关的响应信息,并且通过公共信道将该单个数据单元发送到第一至第三UE以便应答第一至第三UE的RACH前导。
如图6所示,第一UE(UE1)在步骤S60将其RACH前导发送到eNode-B,并且第二UE(UE2)在与发送第一UE的RACH前导相同或类似的时间将其RACH前导发送到eNode-B。换言之,第一UE(UE1)和第二UE(UE2)在相同或类似的时间将其RACH前导发送到eNode-B。
因此,eNode-B在预定时间(Δt)内接收来自至少两个UE的至少一个RACH前导。虽然图6仅图示了第一(UE1)和第二(UE2)UE,但对于本领域的技术人员来说很明显的是,UE的数目可以是N并且本发明还可以应用于N个UE。
eNode-B接收第一(UE1)和第二(UE2)UE的RACH前导,并且在步骤S62发送对所接收的RACH前导的响应信息。eNode-B在不将唯一的射频RF信道分配给第一(UE1)和第二(UE2)UE的情况下通过公共信道来发送响应信息以应答RACH前导。公共信道允许小区内的所有UE接收或读取来自eNode-B的数据。
图7是图示根据本发明的一个实施例、用于通过作为公共信道的下行链路共享信道(DL-SCH)将响应信息发送到UE的方法的示意图。通常,DLSCH被用于将来自eNode-B的数据发送到预定的UE,或被用于将数据发送到小区中的所有UE。因此,不同的UE可以通过DL-SCH接收数据。
虽然eNode-N通过DL-SCH同时发送与多个UE相关的响应信息,但每个UE可以从eNode-B接收其响应信息。eNode-B通过DL-SCH将与RACH前导相关的响应信息发送到UE。响应信息的单个数据单元包括与多个UE相关的多个响应信息。
如图7所示,UE必须首先读取下行链路共享控制信道(DL-SCCH)以便读取DL-SCH的数据。DL-SCH的位置信息是通过DL-SCCH发送的。
换言之,发送RACH前导之后,UE读取DL-SCCH以接收来自eNode-B的响应信息,并且随后识别与DL-SCCH相关的DL-SCH的位置信息。通过DL-SCCH将与物理层和/或第二层相关的控制信号从eNode-B发送到UE。
DL-SCCH携带有各种信息,诸如用于指示UE中的哪一个将接收数据的UE ID(标识符)、指示哪个DL-SCH数据将被UE读取的与频率或时间有关的位置信息、期望读取DL-SCH数据的UE所需的特定信息、以及解码信息。以这种方式,可以借助于DL-SCCH中包括的UE ID来识别UE中的哪一个将接收特定DL-SCH数据。
如图6所示,DL-SCH携带有针对第一UE(UE1)的第一响应信息和针对第二UE(UE2)的第二响应信息。换言之,第一UE(UE1)和第二UE(UE2)读取相同的DL-SCCH并确定相同的DL-SCH位置。
第一UE(UE1)和第二UE(UE2)通过相同的DL-SCH读取其唯一的响应信息。通过在eNode-B的第二层复用针对每个UE的每个响应信息,将对在相同或类似的时间从UE发送的RACH前导的响应信息发送到UE。
eNode-B配置对已在相同或类似的时间被UE发送的RACH前导的响应信息。以单个MAC协议数据单元(PDU)的形式配置该响应信息。
下文中将参照表1和2描述用于复用UE的响应信息以配置单个MAC PDU和发送该单个MAC PDU的方法。
表1中示出通过复用响应信息所配置的PDU的典型示例:
表1
如表1所示,eNode-B在第一UE′响应信息之前配置第一UE′报头。该报头包括UE ID,用于指示响应信息意欲被哪个UE读取,还包括指示响应信息的长度的特定信息。
eNode-B在第一UE报头之后配置第一UE′响应信息。针对第一UE的响应信息包括分配给第一UE的上行链路无线电资源、小区内的标识符、第一UE的临时标识符、以及与跟eNode-B的同步相关的补偿值。
在配置第一UE报头和第一UE′响应信息之后,eNode-B配置第二UE′报头和第二UE′响应信息。以这种方式,可以配置通过将多个UE的响应信息包括在单个响应信息中而生成的PDU。
表2中示出通过复用响应信息所配置的单个PDU的另一个示例。
如表2中所示,包括第一UE′标识符和响应信息长度的报头被附于MAC PDU。报头起到与表1中所示报头相同的作用。
表2
第二UE′报头在第一UE′报头之后被附于PDU。以这种方式,PDU包括与UE的数目(N)一样多的报头,针对所述UE的响应信息将被包括在单个响应信息中。
指示报头的末端的指示被附于报头的末端。eNode-B可以使用这个报头来识别响应信息的开始。因此,通过依次地附加各个UE的响应信息来形成MAC PDU。
每个UE的响应信息包括分配给每个UE的上行链路无线电资源的信息、小区内的标识符、UE的临时标识符、以及与跟eNode-B同步相关的补偿值。每个UE从已被复用成单个响应信息且通过公共信道被发送的多个响应信息中识别其自己的响应信息。每个UE使用在与其RACH前导相关的响应信息中分配给每个UE的上行链路无线电资源将数据发送到eNode-B。
图8是图示根据本发明的另一实施例、用于在移动通信系统中发送响应信息的方法的流程图。具体地说,图8图示用于特定情形的调度方法,在该特定情形中,当数据被发送到eNode-B时,使用了HARQ(混合ARQ)方案。
如图8所示,以与图6所示方式类似的方式,第一UE(UE1)在步骤S70将其RACH前导发送到eNode-B,且第二UE(UE2)在步骤S71将其RACH前导发送到eNode-B。第一(UE1)和第二UE(UE2)在步骤S72通过诸如DL-SCH的公共信道接收以单个数据单元的形式配置的响应信息。
每个UE随后使用在与每个RACH前导相关的响应信息中分配给每个UE的上行链路无线电资源将数据发送到eNode-B。应注意到,图8仅图示了在接收到响应信息之后第二UE(UE2)与eNode-B之间的数据发送/接收处理。对于本领域的技术人员来说很明显的是,上述处理还可以以与对于第二UE(UE2)的相同的方式被应用于的第一UE(UE1)的情形。
假如当每个UE使用所分配的上行链路无线电资源通过RACH将数据发送到eNode-B时使用HARQ方案,那么用于数据重新发送的上行链路无线电资源不会被预先分配,而是在由于eNode-B的解码失败而需要数据重新发送时用NACK信号来分配且发送到每个UE。NACK信号中可以包括用于数据重新发送的上行链路无线电资源。可以用特定控制信号将用于重新发送的上行链路无线电资源分配给UE。
如图8所示,第二UE(UE2)在接收到来自eNode-B的响应信息之后在步骤S73将数据发送到eNode-B。第二UE(UE2)在将上述数据发送到eNode-B时采用HARQ方案。eNode-B通过系统信息将HARQ方案的设置告知UE。
eNode-B接收来自第二UE(UE2)的数据并且解码接收到的数据。如果eNode-B没有正确地解码数据,则其在步骤S74将NACK信号发送到第二UE(UE2)以指示解码错误。
eNode-B将数据重新发送所需的无线电资源分配给第二UE(UE2),并连同NACK信号一起同时发送与所分配的无线电资源相关的信息。换言之,当eNode-B将RACH前导的响应信息发送到UE时,响应信息中的上行链路无线电资源分配信息仅与HARQ的第一传输有关。
例如,如果在RACH前导之后的数据发送所需的无线电资源具有特定值100并且数据由于HARQ操作而需要重新发送,那么UE重新需要100的无线电资源。如果将数据重新发送应用于其中eNode-B根据UE的RACH前导来分配上行链路无线电资源的情形中,则将把200的无线电资源资源分配给UE。
但是,当作为UE的RACH前导的响应信息来分配无线电资源时,则根据本发明eNode-B仅将与第一传输相关的100的无线电资源分配给UE。此后,如果由于UE数据发送的失败而需要数据重新发送,则eNode-B另外地不仅将NARCK信号而且还将100的另外的无线电资源分配给UE。
可以根据与RACH前导的响应信息的格式相同的格式来发送特定控制信号,该特定控制信号包括数据重新发送所需的无线电资源分配信息。而且,eNode-B把无线电资源分配给UE时所使用的信道也可以用作本发明的示例。
第二UE(UE2)在步骤S75根据用NACK信号发送的上行链路无线电资源分配信息来重新发送数据。
图9是图示根据本发明的另一实施例、用于在移动通信系统中发送响应信息的方法的流程图。具体地说,图9图示了用于特定情形的调度方法,在该特定情形中,当数据被发送到eNode-B时使用HARQ(混合ARQ)方案。与图8的情形的一个差别是用于数据重新发送的上行链路无线电资源可以不包括在NACK信号中,而是在相同或另一个时间与NACK信号分开发送。
如图9所示,以与图6和8中所示方式类似的方式,第一UE(UE1)在步骤S80将其RACH前导发送到eNode-B,并且第二UE(UE2)在步骤S81将其RACH前导发送到eNode-B。第一UE(UE1)和第二UE(UE2)在步骤S82通过诸如DL-SCH的公共信道来接收以单个数据单元的形式配置的响应信息。
每个UE随后在步骤S83通过使用在与每个RACH前导相关的响应信息中分配给每个UE的上行链路无线电资源将数据发送到eNode-B。还应注意到,图9仅图示了在接收响应信息之后在第二UE(UE2)与eNode-B之间的数据发送/接收处理。对于本领域的技术人员来说很明显的是,上述处理还可以以与对于第二UE(UE2)的相同的方式应用于第一UE(UE1)的情形。
第二UE(UE2)在将上述数据发送到eNode-B时采用HARQ方案。eNode-B优选地通过系统信息将HARQ方案的设置告知UE。
假如在每个UE使用所分配的上行链路无线电资源通过RACH将数据发送到eNode-B时使用HARQ方案,那么用于数据重新发送的上行链路无线电资源不会被预先分配,而是在由于eNode-B的解码失败而需要数据重新发送时用NACK信号来分配并且发送到每个UE。在步骤S84,当由于eNode-B的解码失败而需要数据重新发送时,发送NACK信号。并且分配用于数据重新发送的上行链路无线电资源。即,用于数据重新发送的上行链路无线电资源不是被预先分配,而是在需要重新发送时被分配并且发送到每个UE。可以用特定控制信号将用于重新发送的上行链路无线电资源分配给UE。该特定控制信号可以是在步骤S85的来自eNode-B的SR(调度资源)的信号。该特定控制信号还可以是用于调度信息的信号或任何其它信号。
可以根据与RACH前导的响应信息的格式相同的格式来发送特定控制信号,该特定控制信号包括数据重新发送所需的无线电资源分配信息。而且,eNode-B把无线电资源分配给UE时所使用的信道也可以用作本发明的示例。
第二UE(UE2)根据用例如SR的特定控制信号所发送的上行链路无线电资源分配信息在步骤S86重新发送数据。
如此处所描述的,根据本发明的用于在移动通信系统中发送响应信息的方法可以更有效地使用无线电资源,从而降低了被浪费的无线电资源的量。
对于本领域的技术人员来说明显的是,在不脱离本发明的精神和范围的情况下,可以对本发明进行各种修改和变更。因此,本发明意欲涵盖对本发明的修改和变更,只要它们在所附权利要求书及其等价物的范围内。
由于本发明可以在不脱离其精神或本质特征的情况下以多种形式体现,因此还应理解的是,除非另有规定,否则上述实施例不局限于以上描述的任何细节,而是应广泛地解释为在所附权利要求书所限定的精神和范围内。因此,所附权利要求意欲涵盖落入权利要求书的界限或此类界限的等价物的范围内的所有变更和修改。
工业实用性
前述实施例和优点仅仅是示范性的并且不应被解释为限制本发明。本教导可以轻易地应用于其它类型的装置。
本发明的描述意在进行说明,并且不限制权利要求书的范围。许多替换、修改和变更对于本领域的技术人员来说将是明显的。在权利要求书中,手段加功能语句意欲涵盖此处所描述的执行所述功能的结构,并且不仅涵盖结构等价物,而且还涵盖等价结构。
Claims (14)
1.一种用户设备(UE)在移动通信系统中执行随机接入的方法,所述方法包括:
发送特定随机接入前导;
在发送所述特定随机接入前导之后,监控包含关于特定随机接入响应的位置的控制信息的下行链路控制信道,所述特定随机接入响应对应于所述特定随机接入前导,所述特定随机接入响应要在下行链路共享信道中被接收;
当经由所述下行链路控制信道接收到标识所述特定随机接入响应经由所述下行链路共享信道被发送的所述控制信息时,基于所述下行链路控制信道中的所述控制信息,接收包含所述特定随机接入响应的所述下行链路共享信道;
处理经由所述下行链路共享信道接收的所述特定随机接入响应。
2.根据权利要求1所述的方法,其中,所述特定随机接入响应被作为在所述下行链路共享信道上接收的介质访问控制分组数据单元(MAC PDU)的一部分被接收。
3.根据权利要求2所述的方法,其中,所述MAC PDU包括一个或多个包括所述特定随机接入响应的随机接入响应。
4.根据权利要求2所述的方法,其中,所述MAC PDU包括MAC报头和一个或多个包括所述特定随机接入响应的随机接入响应。
5.根据权利要求4所述的方法,其中,所述MAC报头包括一个或多个报头部分,所述报头部分的每一个对应于所述随机接入响应的每一个。
6.根据权利要求1所述的方法,其中,所述特定随机接入响应包括分配给所述UE的上行链路资源信息、所述UE的临时标识符和定时同步相关的变量。
7.根据权利要求6所述的方法,进一步包括:
使用所述上行链路资源信息发送上行链路信号。
8.一种用于网络在移动通信系统中控制用户设备(UE)的随机接入的方法,所述方法包括:
接收来自所述UE的特定随机接入前导;
在接收到所述特定随机接入前导之后,发送包含关于特定随机接入响应的位置的控制信息的下行链路控制信道,所述特定随机接入响应对应于所述特定随机接入前导,所述特定随机接入响应要在下行链路共享信道中发送,所述控制信息标识对应于所述特定随机接入前导的所述特定随机响应经由所述下行链路共享信道的发送;以及
根据所述控制信息,经由所述下行链路共享信道发送所述特定随机接入响应。
9.根据权利要求8所述的方法,其中,所述特定随机接入响应被作为通过所述下行链路共享信道发送的介质访问控制分组数据单元(MAC PDU)的一部分被发送。
10.根据权利要求9所述的方法,其中,所述MAC PDU包括一个或多个包括所述特定随机接入响应的随机接入响应。
11.根据权利要求9所述的方法,其中,所述MAC PDU包括MAC报头和一个或多个包括所述特定随机接入响应的随机接入响应。
12.根据权利要求11所述的方法,其中,所述MAC报头包括一个或多个报头部分,所述报头部分的每一个对应于所述随机接入响应的每一个。
13.根据权利要求8所述的方法,其中,所述特定随机接入响应包括分配给所述UE的上行链路资源信息、所述UE的临时标识符和定时同步相关的变量。
14.根据权利要求13所述的方法,进一步包括:
接收与所述上行链路资源信息相关的上行链路信号。
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