CN102882635A - 改进的信道质量指示符方法 - Google Patents
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Abstract
本发明提供一种方法,该方法将与LTE-A的未来版本一起工作,具有后向兼容性,并且减轻对用于基本系统操作的信号的干扰。该方法包括生成与一个或多个信道质量指示符相关联的一个或多个参考信号,并且包括将该一个或多个信道质量指示符-参考信号映射到一个或多个子帧的第二时隙的最后一个符号。
Description
本申请是2010年3月17日提交的中国专利申请No.201080012550.5的发明名称为“改进的信道质量指示符方法”的分案申请。
技术领域
本发明涉及无线通信系统,并且更具体地涉及用于根据一个或多个子帧确定信道质量指示符参考信号(CQI-RS)和从一个或多个子帧传输信道质量指示符参考信号(CQI-RS)的方法,使得相关联的用户设备(UE)能够使用CQI-RS来测量CQI。
背景技术
在诸如长期演进(LTE)系统和高级长期演进(LTE-A)之类的高级移动通信系统中,利用用户设备(UE)来测量和向演进的节点B(eNB)报告通信系统中的众多参数,包括秩指示符(RI)、信道质量指示符(CQI)、或者预编码矩阵指示符(PMI),由此能够支持资源分配、链路适配和空间复用传输。
当前,第8版LTE的RI、CQI/PMI测量是基于小区特定的参考信号(CRS)来执行的。每个CRS与eNB处的发射天线端口(存在最多4个发射天线端口)相关联。因此,对于空间复用而言,能够支持的发射层的最大数目限于可用的天线端口的数目(即4)。
可以设想,对于LET-A(第10版),用于空间复用的天线端口的数目或者发射层数应该多达8。因此,需要更多的参考信号以能够支持高阶的MIMO传输。
而且,LTE-A考虑的一种新技术是协调多点(CoMP)传输。因此LTE-A UE可能还需要测量和报告从参与CoMP传输的eNB发射的参考信号的RI、CQI/PMI(或者类似的度量)。
这种复杂性提高引起的问题在于,有可能对基本系统操作的重要信号的干扰,以及存在在旧UE上的后向兼容问题。
因此,希望提供一种方法,该方法将与LTE-A的未来版本一起工作,具有后向兼容性,并且减轻对用于基本系统操作的信号的干扰。
应该理解,本文中对以现有技术给出的任何内容的引用不应该被视为承认在形成本说明书的一部分的权利要求书的优先权日时,这些内容在澳大利亚或者其他地方是已知的,或者其包含的信息是公知技术的一部分。
发明内容
一种改进的信道质量指示符方法,用于根据一个或多个子帧确定一个或多个信道质量指示符参考信号和从一个或多个子帧传输一个或多个信道质量指示符参考信号,使得相关联的用户设备能够使用信道质量指示符参考信号来测量信道质量指示符,该子帧包括第一和第二时隙,该第一和第二时隙中的每一个包括多个符号,以及该第一和第二时隙中的每一个形成资源块,其中所述方法包括:
生成与一个或多个信道质量指示符相关联的一个或多个参考信号,
将该一个或多个信道质量指示符-参考信号映射到一个或多个子帧的第二时隙的最后一个符号。
下面的描述更加具体地参考本发明的各种特征和步骤。为了促进对本发明的理解,在描述中参考了附图,附图中以优选实施例示出了本发明。应该理解,无论如何,本发明不限于附图中示出的优选实施例。
附图说明
图1A是示出一个层的CQI-RS的位置的、具有两个常规循环前缀(CP)资源块的子帧的示意图;
图1B是示出一个层的CQI-RS的位置的、具有两个扩展循环前缀(CP)资源块的子帧的示意图;
图2是示出经由FDM(频分复用)进行复用的多个层的CQI-RS的位置的、具有两个常规循环前缀(CP)资源块的子帧的示意图;
图3是示出经由混合的FDM和CDM(码分复用)进行复用的多个层的CQI-RS的位置的、具有两个常规循环前缀(CP)资源块的子帧的示意图;
图4是示出经由混合的FDM和CDM进行复用的CoMP小区的多个层的CQI-RS的位置的、具有两个常规循环前缀(CP)资源块的子帧的示意图;
图5是示出小区特定的子帧偏移的使用的一系列子帧的示意图;
图6是示出针对CoMP小区设计的小区特定的子帧偏移的使用的一系列子帧的示意图;
图7是示出资源块偏移参数RBoffset的使用的子帧带宽的示意图;
图8是示出适于CoMP小区的资源块偏移参数RBoffset的使用的子帧带宽的示意图。
具体实施方式
接下来参考附图详细描述本发明的示例实施例。
现在参考图1A,其中示出了具有两个常规循环前缀(CP)资源块105、110的子帧100。以频率(f)轴和时间(t)轴示出子帧100。资源块105、110是在时间(t)上占一个时隙130、135宽度且在频率(f)上占12个子载波宽度的传输单元。对于常规循环前缀资源块105、110,在每个时隙130、135中,沿着时间轴占7个符号。构成总的资源块105、110的多个资源元素是小区特定的参考信号(CRS)125以及第一和第二“高级长期演进信道质量指示符-参考信号”(LTE-A CQI-RS)115、120。
在操作中,一层的CQI-RS在最后一个OFDM符号(即,第二时隙中的编号为6的OFDM符号)中传输,以便避免与第8版小区特定的参考信号(CRS)、第8版专用参考信号(DRS)、以及物理广播信道(PBCH)和同步信号发生冲突。优选地,在资源块105、110中存在两个CQI-RSRE,并且CQI-RS均匀分布在资源块的12个子载波上。为每层提供两个CQI-RS RE是有利的,因为发现其在CQI-RS开销和CQI测量性能之间提供了良好的均衡。
在图1A中还示出针对高层配置的第一小区特定的子载波偏移foffset。第一foffset确定距离资源块中的最小子载波索引的CQI-RS资源要素(RE)位置偏移。这在图1A示出为第一foffset=2。在每个资源块2个CQI-RS RE的优选情况下,第一foffset可用取0-5的值。
图1B与图1A基本相同,但是示出了包括两个扩展循环前缀(CP)资源块105、110的子帧100。以频率(f)轴和时间(t)轴示出子帧100。资源块105、110是在时间(t)上占一个时隙130、135宽度且在频率(f)上占12个子载波宽度的传输单元。对于扩展循环前缀资源块105、110,每个时隙130、135沿着时间轴占6个符号。在操作中,一层的CQI-RS在最后一个OFDM符号(即,第二时隙135中的编号为5的OFDM符号)中传输。
有利地,通过将针对可以应用于LTE-A操作的所有层的CQI-RS设计为仅放在子帧内的一个特定的OFDM符号中,提供了一种简单的方式避免对第8版CRS、第8版DRS以及PBCH和同步信号的干扰和避免来自它们的干扰。
图2示出了具有两个常规循环前缀(CP)资源块205、210的子帧200,并且进一步示出了经由频分复用进行复用的多个层的CQI-RS的优选位置。与图1A和1B类似,以频率(f)轴和时间(t)轴示出子帧200。资源块205、210是在时间(t)上占一个时隙230、235宽度且在频率上(f)上占12个子载波宽度的传输单元。对于常规循环前缀资源块205、210,每个时隙230、235均沿着时间轴包括7个符号。多个资源元素构成资源块205、210,包括小区特定的参考信号(CRS)225以及第一LTE-ACQI-RS 240(层1)、第二LTE-A CQI-RS 245(层1)、第一LTE-A CQI-RS250(层2)、第二LTE-A CQI-RS 255(层2)、第一LTE-A CQI-RS 260(层3)、第二LTE-A CQI-RS 265(层3)、第一LTE-A CQI-RS 270(层4)和第二LTE-ACQI-RS 275(层4)。
在图2中,对于各层经由FDM进行复用的情形,用于LTE-A操作的所有层的CQI-RS在相同的OFDM符号(即编号6的符号)中传输。FDM框架内的特定设置是示例说明性的,其他设置也是可能的。
图3示出了具有两个常规循环前缀(CP)资源块305、310的子帧300,并且进一步示出了经由混合的频分复用(FDM)和码分复用(CDM)进行复用的多个层的CQI-RS的优选位置。多个资源元素构成资源块305、310,包括小区特定的参考信号(CRS)325以及第一LTE-A CQI-RS315(层1和层2)、第二LTE-ACQI-RS 320(层1和层2)、第一LTE-ACQI-RS 340(层3和层4)和第二LTE-ACQI-RS 345(层3和层4)。
在图3中,对于各层经由FDM和CDM混合进行复用的情形,用于LTE-A操作的所有层的CQI-RS在相同的OFDM符号(即编号6的符号)中传输。混合的FDM和CDM框架内的特定设置是示例说明性的,其他设置也是可能的。
图4示出了说明经由混合的FDM和CDM进行复用的CoMP小区的多个层的CQI-RS的位置的、具有两个常规循环前缀(CP)资源块405、410的子帧400。在操作中,一层的CQI-RS在最后一个OFDM符号(即,第二时隙435中的编号为6的OFDM符号)中传输,以便减轻CQI-RS小区间干扰。还通过包括第一小区特定的子载波偏移第一foffset和第二小区特定的子载波偏移第二foffset来进一步减少小区间干扰。第一foffset确定相对于小区1的资源块的最小子载波索引的CQI-RS的资源元素(RE)位置偏移。这在图4中示出为第一foffset=2。第二foffset确定相对于小区2的资源块的最小子载波索引的CQI-RS的资源元素(RE)位置偏移。这在图4中示出为第二foffset=4。因此,LTE-A CQI-RS如下:第一LTE-ACQI-RS 440(小区1的层1和层2)、第二LTE-A CQI-RS 445(小区1的层1和层2)、第一LTE-A CQI-RS 450(小区1的层3和层4)、第二LTE-A CQI-RS 455(小区1的层3和层4)、第一LTE-A CQI-RS 460(小区2的层1和层2)、第二LTE-A CQI-RS 465(小区2的层1和层2)、第一LTE-A CQI-RS 470(小区2的层3和层4)和第二LTE-A CQI-RS 475(小区2的层3和层4)。
有利地,foffset允许针对CoMP CQI-RS传输的稳健的小区间干扰管理。
仅LTE-A用的CQI-RS的传输周期配置
图5是示出小区特定的子帧偏移SFofffset 510和CQI-RS传输周期TCQI-RS.505的使用的一系列子帧500的示意图。TCQI-RS.505与第8版LTE的CQI/PMI报告周期相同,即针对频分复用(FDD)为2ms、5ms、10ms、20ms、40ms、80ms和160ms,以及针对时分复用(TDD)为1ms、5ms、10ms、20ms、40ms、80ms和160ms。然而,TCQI-RS.505是小区特定的,而CQI/PMI报告周期是UE特定的,因此TCQI-RS.505和CQI/PMI报告周期的配置是独立的。在实践中,CQI/PMI报告周期通常不短于TCQI-RS.505。
高层配置的小区特定的子帧偏移SFoffset510确定CQI-RS传输相对于帧内的子帧0的子帧偏移。SFoffset从0ms到(TCQI-RS-1)ms中取值。图5示出了2ms的TCQI-RS.505和1ms的SFoffset。
有利地,TCQI-RS.505在控制CQI-RS开销方面是有用的,而SFoffset510在减轻CoMP小区中的CQI-RS小区间干扰是有用的。
图6示出了一系列子帧600,并且示出了可以如何使用SFoffset以避免在相同子帧中传输不同CoMP小区的CQI-RS的示例。在该情形下,小区1的SFoffset625具有1ms的值,以及小区2的SFoffset610具有0ms的值,以及TCQI-RS.605为2ms。
针对仅LTF-A用的CQI-RS的资源块分配
CQI-RS子带(其可以标为k)以与第8版LTE中的CQI报告子带类似的方式进行定义。CQI-RS子带大小或者等同地包含CQI-RS的资源块的数目基于单个分量载波的系统带宽来确定,类似于第8版LTE中的CQI报告子带大小的确定。具体地,CQI-RS子带大小的确定如表1所示。
表1CQI-RS子带大小k vs.单个分量载波的系统带宽
单个分量载波的系统带宽 | CQI-RS子带大小,k |
6-7 | 整个系统带宽 |
8-10 | 4 |
11-26 | 4 |
27-63 | 6 |
64-110 | 8 |
在CQI-RS子带中仅存在一个包含CQI-RS的资源块。鉴于此,图7示出了说明资源块偏移参数RBoffset710的使用的子帧700(每个子带715具有8个资源块)的带宽(20MHz)的示意图。每个子带715包括包含CQI-RS(子带大小=8个资源块)的资源块705。包含CQI-RS的资源块的确切位置由参数RBoffset 710来确定。RBoffset的范围为0到k-1。
RBoffset710可以由高层来配置,或者可以随着子帧编号递增从子带内的第一资源块循环到最后一个资源块(即,将CQI-RS循环分配给子带内的资源块)。
有利地,如图8所示,参数RBoffset还可以用于减轻CoMP小区中的CQI-RS小区间干扰。在图8中,示出了子带815内的小区1RBoffset820和小区2RBoffset825。使用两个偏移以避免在相同资源块中传输不同的CoMP小区的CQI-RS。在循环分配的情形下,可以通过为循环操作的不同CoMP小区配置不同的开始位置来避免冲突。
有利地,在CQI-RS子带中仅存在一个包含CQI-RS的资源块。包含CQI-RS的资源块的总数基于针对单个分量载波的系统带宽来确定。有利地,包含CQI-RS的资源块均匀分布在系统带宽上,这意味着能够覆盖整个系统带宽(在分量载波内)。这被称为LTE-A中的“宽带”要求。另一个优势在于,该设置通过使得子带内的包含CQI-RS的资源块数目最小化,最小化了对传统用户设备(例如第8版LTE)的影响。
尽管已经出于示例说明的目的公开了本发明的示例实施例,本领域技术人员应该明白在不偏离本发明的范围的情况下可以有各种修改、添加和替代。因此,本发明不限于上述实施例,而是有所附的权利要求书限定。
本申请基于在2009年3月19日提交的澳大利亚临时专利申请NO.2009901196,并且要求其优先权,该临时申请的全部内容通过引用并入本文。
Claims (28)
1.一种在无线通信系统中实现的方法,所述方法包括:
在子帧中从基站向用户设备(UE)传输一个或多个信道质量指示符(CQI)参考信号;以及
从用户设备向基站传输根据所述一个或多个CQI参考信号确定的报告,
其中所述CQI参考信号传输按CQI参考信号传输周期进行重复,以及
其中在帧内提供用于所述CQI参考信号传输的子帧偏移。
2.根据权利要求1所述的方法,其中所述报告包括秩指示符(RI)、CQI以及预编码矩阵指示符(PMI)中的至少一个。
3.根据权利要求1所述的方法,其中所述CQI参考信号传输避免与小区特定的参考信号(CRS)、专用参考信号(DRS)、物理广播信道(PBCH)或同步信号发生冲突。
4.根据权利要求1所述的方法,其中所述CQI参考信号传输周期包括下述时间中的任意一种:5ms、10ms、20ms、40ms、80ms和160ms。
5.根据权利要求1所述的方法,其中针对频分复用(FDD)传输,所述CQI参考信号传输周期包括下述时间中的任意一种:2ms、5ms、10ms、20ms、40ms、80ms和160ms。
6.根据权利要求1所述的方法,其中针对时分复用(TDD)传输,所述CQI参考信号传输周期包括下述时间中的任意一种:1ms、5ms、10ms、20ms、40ms、80ms和160ms。
7.根据权利要求1所述的方法,其中所述CQI参考信号传输周期是小区特定的,而CQI或PMI报告周期是UE特定的。
8.根据权利要求1所述的方法,其中CQI或PMI报告周期等于或大于所述CQI参考信号传输周期。
9.根据权利要求1所述的方法,其中子帧偏移是相对于帧内的子帧0而言的,并且从0ms到(TCQI-RS-1ms)中取值,其中TCQI-RS表示所述CQI参考信号传输周期。
10.根据权利要求1所述的方法,其中所述子帧偏移是小区特定的。
11.根据权利要求1所述的方法,其中所述一个或多个CQI参考信号被用于空间复用的一个或多个天线端口,所述一个或多个天线端口的数目等于或小于8,或者所述一个或多个CQI参考信号被用于一个或多个传输层,所述一个或多个传输层的数目等于或小于8。
12.根据权利要求1所述的方法,其中CQI参考信号的位置取决于循环前缀(CP)长度。
13.根据权利要求1所述的方法,其中所述基站被配置为在协调多点(CoMP)传输中使用。
14.一种无线通信系统,包括:
用户设备(UE);
基站,用于在子帧中向用户设备传输信道质量指示符(CQI)参考信号,
其中用户设备向基站传输根据所述CQI参考信号确定的报告,以及
其中所述子帧包括资源块,并且所述资源块中的最后一个OFDM(正交频分复用)符号传送所述CQI参考信号。
15.根据权利要求14所述的无线通信系统,其中所述报告包括秩指示符(RI)、CQI以及预编码矩阵指示符(PMI)中的至少一个。
16.根据权利要求14所述的无线通信系统,其中所述CQI参考信号传输避免与小区特定的参考信号(CRS)、专用参考信号(DRS)、物理广播信道(PBCH)或同步信号发生冲突。
17.根据权利要求14所述的无线通信系统,其中所述CQI参考信号传输周期包括下述时间中的任意一种:5ms、10ms、20ms、40ms、80ms和160ms。
18.根据权利要求14所述的无线通信系统,其中针对频分复用(FDD)传输,所述CQI参考信号传输周期包括下述时间中的任意一种:2ms、5ms、10ms、20ms、40ms、80ms和160ms。
19.根据权利要求14所述的无线通信系统,其中针对时分复用(TDD)传输,所述CQI参考信号传输周期包括下述时间中的任意一种:1ms、5ms、10ms、20ms、40ms、80ms和160ms。
20.根据权利要求14所述的无线通信系统,其中所述CQI参考信号传输周期是小区特定的,而CQI或PMI报告周期是UE特定的。
21.根据权利要求14所述的无线通信系统,其中CQI或PMI报告周期等于或大于所述CQI参考信号传输周期。
22.根据权利要求14所述的无线通信系统,其中子帧偏移是相对于帧内的子帧0而言的,并且从0ms到(TCQI-RS-1ms)中取值,其中TCQI-RS表示所述CQI参考信号传输周期。
23.根据权利要求14所述的无线通信系统,其中所述子帧偏移是小区特定的。
24.根据权利要求14所述的无线通信系统,其中所述一个或多个CQI参考信号被用于空间复用的一个或多个天线端口,所述一个或多个天线端口的数目等于或小于8,或者所述一个或多个CQI参考信号被用于一个或多个传输层,所述一个或多个传输层的数目等于或小于8。
25.根据权利要求14所述的无线通信系统,其中CQI参考信号的位置取决于循环前缀(CP)长度。
26.根据权利要求14所述的无线通信系统,其中所述基站配置为在协调多点(CoMP)传输中使用。
27.一种在无线通信系统中使用的基站,包括:
发射装置,用于在子帧中向用户设备(UE)传输信道质量指示符(CQI)参考信号;以及
接收装置,用于从用户设备接收根据所述CQI参考信号确定的报告,
其中所述子帧包括资源块,并且所述资源块中的最后一个OFDM(正交频分复用)符号传送所述CQI参考信号。
28.一种在无线通信系统中使用的用户设备(UE),包括:
接收装置,用于在子帧中从基站接收信道质量指示符(CQI)参考信号;以及
发射装置,用于向基站传输根据所述CQI参考信号确定的报告,
其中所述子帧包括资源块,并且所述资源块中的最后一个OFDM(正交频分复用)符号传送所述CQI参考信号。
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