CN105790919B - 支持载波聚合的移动通信系统的副载波去激活方法和装置 - Google Patents
支持载波聚合的移动通信系统的副载波去激活方法和装置 Download PDFInfo
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Abstract
提供一种用于支持载波聚合的移动通信系统的、用于激活/去激活除了主载波之外的副载波的副载波激活/去激活方法。该方法包括:当从基站接收到副载波控制消息时,识别要被激活或去激活的载波;当该消息包括副载波激活命令时,确定是否已经到达第一时间点;以及当到达第一时间点时,执行预定第一操作。本发明的优势在于,通过定义要在SCell激活和去激活中进行的UE操作来避免支持载波聚合的通信系统中的故障。
Description
本案是申请日为2012年1月11日、申请号为201280005087.0、发明名称为“支持载波聚合的移动通信系统的副载波激活/去激活方法和装置”的发明专利申请的分案申请。
技术领域
本发明涉及移动通信系统。更具体地说,本发明涉及一种用于支持载波聚合的移动通信系统的、激活/去激活除了主载波之外的副载波(或多个)的方法。
背景技术
随着无线通信技术的快速发展,长期演进(LTE)正在第四代(4G)移动通信技术中占据引人注目的位置。已经引入各种技术来满足LTE的高容量需求。载波聚合是一种通过在用户设备(UE)和演进节点B(eNB)之间通过与主载波一起聚合一个或更多个副载波而与单个载波传输相比增加峰值数据速率和容量的技术。在LTE中,主载波被称为主小区(PCell),并且副载波被称为副小区(SCell)。
发明内容
技术问题
载波聚合技术对于PCell控制SCell造成了额外的控制复杂度。这意味着PCell应当能够确定是否使用SCell,并且如果使用,则确定要使用的SCell。也存在对于一种用于激活和去激活SCell的方法的需要。这意味着应当具体规定UE在从eNB接收SCell激活/去激活命令中的实际操作。
解决方案
本发明的各方面要解决至少上述问题和/或缺点并提供至少下述优点。因此,本发明的一个方面是提供一种用于在支持载波聚合的移动通信系统中激活和去激活SCell的方法。
本发明的另一方面是提供一种用于在移动通信系统激活和去激活SCell的方法,其能够在SCell的激活中延迟发起一些操作,在SCell的去激活中提前终止一些操作,并且以预定时间来终止一些操作。
根据本发明的一个方面,提供了一种用于在支持载波聚合的移动通信系统中激活/去激活终端的副载波的方法。该方法包括:当从基站接收到副载波控制消息时,识别要被激活或去激活的载波;当该消息包括副载波激活命令时,确定是否已经到达第一时间点;以及当到达第一时间点时,执行预定第一操作。
根据本发明的另一个方面,提供了一种用于在支持载波聚合的移动通信系统中控制副载波的激活/去激活的终端。该终端包括:收发器,用于与基站进行通信;以及控制器,用于当从基站接收到副载波控制消息时识别要被激活或去激活的载波,用于当该消息包括副载波激活命令时确定是否已经到达第一时间点,并且用于当到达第一时间点时执行预定第一操作。
根据本发明的另一个方面,提供了一种用于在支持载波聚合的移动通信系统中激活/去激活终端的副载波的方法。该方法包括:当从基站接收到副载波控制消息时,识别要被激活或去激活的载波;当该消息包括副载波激活命令时,确定第一时间点;以及在第一时间点以前执行预定第一操作。
根据下面结合附图并公开了本发明的示范性实施例的详细描述,本发明的其他方面、优点和潜在特征对于本领域技术人员来说将变得显而易见。
有益效果
根据本发明示范性实施例的副载波激活/去激活方法和装置在支持载波聚合的移动通信系统中与SCell的激活和去激活相关联地控制要在预定时间点执行的特定操作,从而防止UE出故障。
根据本发明示范性实施例的副载波激活/去激活方法和装置也能够确保在SCell的激活和去激活中所需操作的成功执行,结果是无误地完成激活和去激活。
附图说明
通过下面结合附图的描述,本发明的一些示范性实施例的上述和其他方面、特征和优点将变得更加明显,其中:
图1是图示根据本发明的示范性实施例的移动通信系统的架构的图;
图2是图示根据本发明的示范性实施例的移动通信系统的协议栈的图;
图3是图示根据本发明的示范性实施例的、在移动通信系统中的载波聚合的示范性情况的图;
图4是图示根据本发明示范性实施例的用于副载波激活/去激活方法的在用户设备(UE)与演进节点B(eNB)之间的消息流的信令图;
图5是图示根据本发明示范性实施例的用于执行副载波激活/去激活方法中的第一操作的UE过程的流程图;
图6是图示根据本发明示范性实施例的用于执行副载波激活/去激活方法中的第二操作的UE过程的流程图;以及
图7是图示根据本发明示范性实施例的UE的配置的框图。
在通篇附图中,应当注意相似的参考数字用于指示相同或类似的元件、特征或结构。
具体实施方式
提供参照附图的下面描述以有助于全面理解由权利要求及其等价物限定的本发明的示范性实施例。其包括各种特定细节以助于理解,但是这些细节应当被认为仅仅是示范性的。因此,本领域普通技术人员将认识到,可以对这里所述的实施例做出各种变化和修改,而不会脱离本发明的范围和精神。此外,为了清楚和简明,可以省略对公知功能和结构的描述。
在下面描述中使用的术语和词语不限于文献学含义,而是仅仅由发明人用来使得能够清楚而一致地理解本发明。因此,对于本领域技术人员来说显而易见的是,仅仅为了举例说明的目的而并非是为了限制本发明的目的而提供本发明的示范性实施例的下面描述,由所附权利要求及其等价物来限定本发明。
应当明白,单数形式“一”、“一个”和“该”包括复数形式,除非上下文明确指出并非如此。因而,例如,对“一个组件表面”的参照包括对一个或更多个这样的表面的参照。
本发明的示范性实施例涉及一种在支持载波聚合的移动通信系统中的UE的副载波激活/去激活方法和装置。
图1是图示根据本发明的示范性实施例的移动通信系统的架构的图。
参照图1,移动通信系统的无线接入网络包括:演进节点B(eNB)105、110、115和120;移动性管理实体(MME)125;以及服务网关(S-GW)130。用户设备(此后,称为UE)135经由eNB 105、110、115和120以及S-GW 130连接到外部网络。
eNB 105、110、115和120与通用移动通信系统(UMTS)的遗留节点B对应。eNB 105、110、115和120允许UE建立无线链路,并且与遗留节点B相比负责更复杂的功能。在LTE系统中,通过共享信道来提供所有的用户业务,包括诸如网络电话(VoIP)的实时服务。因此,存在对于一种位于eNB中以基于诸如UE缓冲器条件、功率余量状态、信道状态的状态信息来调度数据的设备的需要。通常,一个eNB控制多个小区。为了确保高达100Mbps的数据速率,LTE系统采用正交频分复用(OFDM)作为20MHz带宽的无线接入技术。LTE系统也采用自适应调制和编码(AMC)来与UE的信道条件相适应地确定调制方案和信道编码率。S-GW 130是用于提供数据承载以便在MME 125的控制下建立和释放数据承载的实体。MME 125负责各种控制功能并且连接到多个eNB 105、110、115和120。
图2是图示根据本发明的示范性实施例的移动通信系统的协议栈的图。
参照图2,LTE系统的协议栈包括分组数据汇聚协议(PDCP)层205及240、无线链路控制(RLC)层210及235、媒体访问控制(MAC)层215及230、以及物理(PHY)层220及225。PDCP层205及240负责IP报头压缩/解压缩。RLC层210及235负责将PDCP协议数据单元(PDU)分段为适合于自动重复请求(ARQ)操作的大小的片段。MAC层215及230负责建立到多个RLC实体的连接,以便将RLC PDU复用成MAC PDU并将MAC PDU解复用为RLC PDU。PHY层220及225对MAC PDU执行信道编码并将MAC PDU调制为OFDM码元以经由无线信道发送,或者对所接收的OFDM码元执行解调和信道解码并向更高层传递解码后的数据。
图3是图示根据本发明的示范性实施例的、在移动通信系统中的载波聚合的示范性情况的图。
参照图3,通常eNB使用在不同频带中发送和接收的多个载波。例如,eNB 305能够被配置为使用具有中心频率f1的载波315和具有中心频率f3的载波310。如果不支持载波聚合,则UE 330不得不使用载波310和315中的一个来发送/接收数据。然而,具有载波聚合能力的UE 330能够使用载波310和315二者来发送/接收数据。eNB能够与具有载波聚合能力的UE的信道条件相适应地来增加分配给UE的资源量,以便提高UE的数据速率。
当利用一个下行链路载波和一个上行链路载波来配置小区时,载波聚合可以被理解为好像UE经由多个小区来传达数据那样。通过使用载波聚合,最大数据速率与所聚合的载波的数量成比例地增加。
在下面描述中,语句“UE通过某一下行链路载波接收数据或通过某一上行链路载波发送数据”意味着,UE在与该下行链路载波和上行链路载波的中心频率及频带对应的小区中提供的控制信道和数据信道来发送或接收数据。虽然为了便于解释描述了LTE移动通信系统,但是本发明示范性实施例能够被应用于支持载波聚合的其他类型的无线通信系统。
本发明示范性实施例提出了一种在从eNB接收SCell激活/去激活命令中的UE过程。UE在自接收激活命令起流逝预定时间之后开始一些操作,在自接收去激活命令起预定时间之前结束一些操作,并且在自接收去激活命令起流逝预定时间之后结束一些其他操作。因为当确定该时间点以开始或结束操作的处理延迟时,激活和去激活延迟增加,所以用于执行或结束某一操作的时间点可以与用于执行或结束另一操作的时间点不同。UE不应当在从eNB接收到命令后立即开始SCell中的数据发送/接收。这是因为,这花费额外的时间来激活功能块以用于SCell中的通信。虽然功能块被激活,但是在功能块正常操作之前可能存在一些延迟。
图4是图示根据本发明示范性实施例的用于副载波激活/去激活方法的在UE与eNB之间的消息流的信令图。
参照图4,在步骤405中,eNB 403在第N子帧中向UE 401发送包括关于所配置的SCell当中要被激活/去激活的SCell小区的信息的副载波控制消息(此后,激活/去激活MAC控制元素(CE)与副载波控制消息可交换使用)。激活/去激活MAC CE是大小被固定为8位的MAC CE,并且包括七个C字段和一个R字段。R字段表示保留字段。C字段被称作C7、C6、C5、C4、C3、C2和C1(即,Ci)。每个C字段针对SCelli——即,副载波——的激活被设置为1,而针对SCell的去激活被设置为0。i是在1和7之间的范围内选择的整数以作为副载波标识符,并且当配置新的副载波时连同副载波一起由eNB向UE发送。
当接收到激活/去激活MAC CE时,在步骤407中,UE识别要被激活/去激活的SCell(或多个SCell),并且如果某一小区要被激活,则在步骤409中识别第一时间点。第一时间点指示第N+m子帧,其中m是大于1的整数(例如8)。第一时间点用于执行要在其他操作之前执行的操作。考虑解码所接收的激活/去激活MAC CE和分析解码后的激活/去激活MAC CE的含义所花费的时间来确定m,并且对于具有相对较低的处理能力的终端,m可以具有足够大的值。在步骤411,在第一时间点,即第N+m子帧,UE执行要在第一时间点执行的第一操作。这些操作可以包括:
开始信道状态信息(CSI)报告:CSI报告包括eNB的链路适配和调度所需要的CQI/PMI/RI/PTI;
CQI(信道质量指示符):为满足10%的误码率而推荐的传输格式;
PMI(预编码矩阵索引):在闭环空间复用中使用的索引;
RI(秩指示符):推荐的传输秩;
PTI(预编码器类型指示符):推荐的预编码器类型;
开始监视SCell中的PDCCH(物理下行链路控制信道);
开始SRS(探测参考码元)的传输(仅当配置了探测参考信号时)。
在步骤413中,eNB在第P子帧中向UE发送指示在为UE配置的SCell当中要被激活/去激活的SCell的激活/去激活MAC CE。
在接收到激活/去激活MAC CE时,在步骤415中,UE识别要被激活/去激活的SCell(或多个),并且如果某一小区要被激活,则在步骤417中识别第二时间点。第二时间点指示第P+o子帧,其中o是大于1的整数(例如8)。第二时间点可以等于第一时间点。在步骤419中,UE在第二时间点、即第P+o子帧之前执行第二操作。因为这些操作与UE和eNB之间的交互不相关,所以UE不必在预定时间点停止这些操作。这些操作包括:
停止监视SCell中的PDCCH(物理下行链路控制信道);
停止发送SRS(探测参考码元)。
在步骤421中,UE执行要在第二时间点、即第P+o子帧执行的第三操作。这些操作包括停止CSI的报告。因为该操作与UE和eNB之间的交互相关,所以UE应当在预定时间点停止这些操作以避免由于没有停止相应操作而导致的eNB的性能恶化。例如,如果eNB没有意识到UE已经停止了报告信道状态信息,则eNB可能因为误判断UE的信道状态而无法调度。
可以通过遵循上述过程来执行所有操作。
图5是图示根据本发明示范性实施例的用于执行副载波激活/去激活方法中的第一操作的UE过程的流程图。
参照图5,在步骤501中,UE在第N子帧中接收具有8位位图的激活/去激活MAC CE。MAC CE的位图中的每一位指示是激活还是去激活对应的SCell。
在接收到激活/去激活MAC CE时,在步骤503中,UE确定是否存在要被新激活的任何SCell,并且如果存在,则识别要激活的SCell。在接收MAC CE之前,UE识别去激活的SCell,并且当接收到MAC CE时,UE在MAC CE的位图中搜索表示去激活的SCell但是被标记为激活的位。
如果存在要被激活的任何SCell,则在步骤505中,UE确定第一时间点并且当到达第一时间点时执行第一操作。如上面参考图4所描述的,第一时间点可以与自其中UE接收激活/去激活MAC CE的第N子帧起流逝m个子帧的持续时间之后的第N+m子帧对应。在步骤507、即第N+m子帧中,UE执行要在第一时间点执行的操作。如上面参考图4所描述的,这些操作包括:
开始信道状态信息(CSI)报告;
开始监视SCell中的PDCCH(物理下行链路控制信道);
开始SRS(探测参考码元)的传输(仅当配置了探测参考码元时)。
UE和eNB二者知晓m的值(例如,m=8)。
图6是图示根据本发明示范性实施例的用于执行副载波激活/去激活方法中的第二操作的UE过程的流程图。
参照图6,在步骤601中,UE在第N子帧中接收具有8位位图的激活/去激活MAC CE。MAC CE的位图中的每一位指示是激活还是去激活对应的SCell。
在接收到激活/去激活MAC CE时,在步骤603中,UE确定是否存在要被去激活的任何SCell,并且如果存在,则识别要被去激活的SCell。在接收MAC CE之前,UE识别激活的SCell,并且当接收到MAC CE时,UE在MAC CE的位图中搜索表示激活的SCell但是被标记为去激活的位。
如果存在要被去激活的任何SCell,则在步骤605中,UE识别第二时间点并且执行假定要在第二时间点到达之前执行的第二操作。如上面参考图4所描述的,第二操作包括:
停止监视SCell中的PDCCH(物理下行链路控制信道);
停止发送SRS(探测参考码元)。
在步骤607中,UE等待第二时间点的到来。如参照图4所描述的,第二时间点与自其中UE接收激活/去激活MAC CE的第P子帧起流逝o个子帧的持续时间之后的第P+o子帧对应。在步骤609、即第P+o子帧中,UE执行假定要在第二时间点执行的第三操作。如上面参考图4所描述的,第三操作包括停止CSI的报告。UE和eNB二者知晓o的值(例如,o=8)。
图7是图示根据本发明示范性实施例的UE的配置的框图。
参照图7,UE包括:高层设备750,用于生成要发送的数据并处理所接收的数据;控制消息处理器707,用于处理所接收的和要发送的控制消息;复用器/解复用器703,用于在控制器709的控制下复用要经由收发器701发送的数据和控制信号,并解复用要分别向控制消息处理器707和高层设备750传送的所接收的数据和控制信号。
根据本发明示范性实施例,当接收到用于激活的激活/去激活MAC CE时,控制消息处理器707向SCell激活/去激活处理器711通知MAC CE的接收,使得SCell激活/去激活处理器711确定第一时间点,并且当到达第一时间点时,向控制器709和控制消息处理器707通知要在第一时间点执行的操作。当接收到用于去激活的激活/去激活MAC CE时,控制消息处理器707向SCell激活/去激活处理器711通知MAC CE的接收,使得SCell激活/去激活处理器711确定第二时间点并且向控制器709和控制消息处理器707通知要在第二时间点到达之前以及当到达第二时间时执行的操作。
虽然描述是针对由执行不同功能的多个功能块而构成的UE,但是本发明示范性实施例不限于此。例如,可以利用收发器和集成控制器来实现UE。在这种情况下,当从eNB接收到副载波控制消息时,控制器检查要被激活/去激活的副载波。控制器可以监视第一时间点的到达,并且进行控制以当到达第一时间点时执行第一操作。
第一时间点是自接收到副载波控制消息起流逝与8个子帧对应的持续时间之后的时间。第一操作可以包括CSI报告发起、副载波上的PDCCH监视发起和SRS传输发起中的至少一个。
当分析副载波去激活命令时,控制器也可以进行控制以在第二时间点到达之前执行第二操作并且在第二时间点执行第三操作。
根据本发明示范性实施例,第二时间点可以等于第一时间点,即自接收到副载波控制消息起流逝与8个子帧对应的持续时间之后的时间。第二操作可以包括副载波上的PDCCH监视终止和SRS传输终止中的至少一个。
如上所述,根据本发明示范性实施例的副载波激活/去激活方法和装置在支持载波聚合的移动通信系统中与SCell的激活和去激活相关联地控制要在预定时间点执行的特定操作,从而避免UE出故障。
根据本发明示范性实施例的副载波激活/去激活方法和装置也能够确保在SCell的激活和去激活中需要的操作的成功执行,结果是无误地完成激活和去激活。
虽然已经参照其一些示范性实施例示出并描述了本发明,但是本领域技术人员应当明白,可以在其中做出形式上和细节上的各种改变,而不会脱离由所附权利要求及其等价物限定的本发明的精神和范围。
Claims (16)
1.一种支持载波聚合的移动通信系统中的用户设备UE的去激活至少一个副小区的方法,该方法包括:
在第一子帧中从基站接收包括该至少一个副小区的去激活命令的控制信息;
在第二子帧中执行与该至少一个副小区的去激活命令对应的第一操作;以及
不迟于第二子帧执行与该至少一个副小区的去激活命令对应的至少一个第二操作。
2.如权利要求1所述的方法,其中第一子帧与第二子帧之间的子帧差是8。
3.如权利要求1所述的方法,其中第一操作是信道状态信息报告的终止。
4.如权利要求3所述的方法,其中该信道状态信息报告包括以下至少一个:信道质量指示符、预编码矩阵索引、秩指示符、和预编码器类型指示符。
5.如权利要求1所述的方法,其中该至少一个第二操作包括该至少一个副小区的物理下行链路控制信道监视的终止和探测参考信号传输的终止中的至少一个。
6.一种支持载波聚合的移动通信系统中的去激活至少一个副小区的用户设备UE,该UE包括:
收发器,用于与基站发送和接收信号;以及
控制器,被配置为在第一子帧中从基站接收包括该至少一个副小区的去激活命令的控制信息,在第二子帧中执行与该至少一个副小区的去激活命令对应的第一操作,并且不迟于第二子帧执行与该至少一个副小区的去激活命令对应的至少一个第二操作。
7.如权利要求6所述的UE,其中第一子帧与第二子帧之间的子帧差是8。
8.如权利要求6所述的UE,其中第一操作是信道状态信息报告的终止。
9.如权利要求8所述的UE,其中该信道状态信息报告包括以下至少一个:信道质量指示符、预编码矩阵索引、秩指示符、和预编码器类型指示符。
10.如权利要求6所述的UE,其中该至少一个第二操作包括该至少一个副小区的物理下行链路控制信道监视的终止和探测参考信号传输的终止中的至少一个。
11.一种支持载波聚合的移动通信系统中的基站的控制副小区的去激活的方法,该方法包括:
产生包括至少一个副小区的去激活命令的控制信息;
在第一子帧中向用户设备UE发送该控制信息;
在第二子帧中接收关于该至少一个副小区的信道状态信息CSI报告;以及
不迟于第二子帧终止该至少一个副小区的探测参考信号的接收。
12.如权利要求11所述的方法,其中第一子帧与第二子帧之间的子帧差是8。
13.如权利要求11所述的方法,其中该CSI报告包括以下至少一个:信道质量指示符、预编码矩阵索引、秩指示符、和预编码器类型指示符。
14.一种支持载波聚合的移动通信系统中的控制副小区的去激活的基站,该基站包括:
收发器,用于与用户设备UE发送和接收信号;以及
控制器,被配置为产生包括至少一个副小区的去激活命令的控制信息,在第一子帧中向该UE发送该控制信息,在第二子帧中接收关于该至少一个副小区的信道状态信息CSI报告,并且不迟于第二子帧终止该至少一个副小区的探测参考信号的接收。
15.如权利要求14所述的基站,其中第一子帧与第二子帧之间的子帧差是8。
16.如权利要求14所述的基站,其中该CSI报告包括以下至少一个:信道质量指示符、预编码矩阵索引、秩指示符、和预编码器类型指示符。
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