CN103748815A - 传输上行链路控制信息 - Google Patents

传输上行链路控制信息 Download PDF

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CN103748815A
CN103748815A CN201180073143.XA CN201180073143A CN103748815A CN 103748815 A CN103748815 A CN 103748815A CN 201180073143 A CN201180073143 A CN 201180073143A CN 103748815 A CN103748815 A CN 103748815A
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layer
modulation
information
instruction
channel
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H.施拉尼-梅尔
S.巴沙
J-K.付
X.陈
A.帕帕塔纳西欧
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Intel Corp
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Abstract

根据一些实施例，可以使用至少两层来传输包括信道质量指数的上行链路控制信息。结果是，在诸如涉及载波聚合的情况的、其中大量分量载波的信息都必须在一个主要分量载波上被提供的情况下，能够提供更多的信息以供使用。

Description

传输上行链路控制信息
相关申请的交叉引用
本申请要求2011年7月1日提交的序列号为61/504,054的临时申请的优先权。
背景技术
本文一般涉及蜂窝通信，以及具体地涉及用于用信号通知有关两个无线连接的设备之间的信道的性质的信息的技术。
为了启动两个设备之间的无线电通信，一个设备需要告知另一个设备关于这两个设备之间的信道条件的信息。然后，因为发射设备具有有关这两个设备之间的信道的性质的信息，所以发射设备知道如何发送该传输。
一种可交换这样的信息的方法是：称为基站或eNodeB的第一设备触发来自称为用户设备或移动台的另一个设备的信道信息的传输。在这样的情况中，eNodeB发送导频（参考）信号给用户设备以及用户设备使用该信号来测量信道。当传输由eNodeB触发时，该信道信息由用户设备通过物理上行链路共享信道（PUSCH）发送给eNodeB。触发的需要是非周期性布置所特有的并且通常不用于其中用户设备周期性地通知eNodeB信道条件的周期性布置中。
随着***复杂性增加，非周期性触发情况中必须在上行链路信道上传输的信息量也在增加。
附图说明
图1是本发明一个实施例的流程图；
图2是本发明一个实施例的示意描绘；
图3是根据一个实施例的层移位的描绘；
图4是一个实施例的***描绘；以及
图5A-5E是根据本发明一些实施例的两个无线电设备之间的上行链路信道信息传输的不同方法的示意描绘。
具体实施方式
上行链路控制信息可包括从移动台传输到基站的信道质量信息（CQI）。在诸如长期演进（LTE）的一些无线技术的情况中，移动台一般称为用户设备（UE）以及基站一般称为eNodeB（eNB）。
当从用户设备到eNodeB的信息传输为非周期性时，信息传输可由从eNodeB发送到用户设备的信号来触发。上行链路信息是从用户设备发送到eNodeB的信息以及下行链路信息是从eNodeB发送到用户设备的信息。
在一些实施例中，一旦用户设备被适当地触发，用户设备就能在上行链路信道上发送大量的信息。信息量可能变为大量的原因有很多。将在下文中论述这些。首先将论述的是枚举可在上行链路信道上提供更多信息的方法。
在一些实施例中，上行链路信道可以分割为一个或更多层。每层可能携带相同或者不同的码字。因此，在一个实施例中，两个分开的层可提供一个码字（CW），如图5A中所示。在另一个实施例中，这两个上行链路层能提供两个不同的码字，码字（CW）1和码字（CW）2，如图5B中所示。在图5B的情况中，虽然使用两个不同的码字，但是对于每层使用相同的调制编码方案（MCS）。调制编码方案除其它之外还指示可用在随后的传输中的调制类型。一定程度上，调制类型随信道质量而变，这是因为对于更高阶的调制方案一般需要更好的信道质量。图5C中所示的又一个选择是为上行链路控制信息（UCI）使用两个不同的层，每层具有不同的码字。但是，在该情况中，用户设备能指定两个MCS中的一个而不是限制于仅一个MSC。图5D中所示的又一个选择是使用上行链路层1（UL1）和上行链路层2（UL2），各自带有不同的码字，即，码字1（CW1）或码字2（CW2），各自利用一个MCS，但是使用层移位。
既然每层可能具有不同的传输条件就可能出现问题，并且作为结果，一层中的数据可能相比其它层上的信息更可能受损害。因此，给定的码字可被分解并在层之间移位，使得单个码字被分割，以及码字的一些部分可在一层上行进，而同一码字的另一些部分可在另一层上行进。同时，第二码字可以以相同的方法被移位。因此，如图5D中所示，第一码字CW1可以部分地在一层上被发送以及部分地在另一层上被发送，而第二码字也在这两层之间被分解。
层移位的一个好处是，来自每个码字的足够的信息有希望通过，即使它只是在质量更好的流上行进的部分，从而必要的信息被eNodeB接收。
图5E中所示的又一个选择是包括两个上行链路层、两个不同的码字以及每层在两个可用的MCS中选取一个。可实现这的一个方法是为第二传输块使用I_MCS信令以同时用信号通知两个MCS。
I_MCS提供索引0到31，它们被映射到不同的调制编码和信令方案。在一些情况中，诸如I_MCS=29的具体索引可以用于与上行链路控制信息有关的信令。因此，通过使用两个传输块，可以提供更多信息，包括为每个流提供不同的MCS。这允许组合经历不同传输条件的流。
因此，参照图1，在一些实施例中，可用软件、固件和/或硬件来实现序列10。在软件和固件实施例中，该序列可由存储在诸如光、磁或半导体存储器的非短暂性计算机可读介质中的计算机执行的指令来实现。该序列一般在事务的用户设备一侧来实现。
该序列在块12开始于生成码字。然后如块14中所指示的，对码字进行加扰。接下来，如块16中所指示的，每个码字被调制映射。在块18每个码字被预编码。然后在块20中完成资源元素映射，随后在块22中进行信号生成。
一般，使用多输入/多输出（MIMO）发射和接收方案。MIMO是使用多个发射器和接收器来同时传送更多数据的无线技术。它利用称为多径的无线电波现象，其中传输的信息从墙壁、天花板和其它物体反射（bounce off），从而通过不同的角度并在稍微不同的时间多次到达接收天线。MIMO技术通过使用多个智能发射器和接收器来有效利用（leverage）多径行为，附加的空间维度用于提高性能和范围。多个天线同时发送和接收多个空间流，从而允许天线同时发射和接收。MIMO使得天线能够组合来自不同路径并在不同时间到达的数据流，从而有效地提高接收器信号捕获能力。
一般由eNodeB使用下行链路控制信息（DCI）格式0或4通过I_MSC=29（其是保留的调制编码方案）和用于传输质量信息的少量分配的物理资源块（PRB）的组合来用信号通知PUSCH上的非周期性的仅CQI的传输。一般，为了该目的，物理资源块的数量必须小于或等于4。质量信息可以是通常称作信道质量指数（CQI）的信息，其是由接收器提供给发射器的指示信道质量的数字。一般，信道质量指数由通常称作预编码矩阵指示符（PMI）的信息补充来形成通常称作信道状态信息（CSI）的信息。当然，也可以预期其它提供信道质量信息的方法。
在使用载波聚合的方案中可以指派多于一个的分量载波。因为服务提供商不总是有宽带可用于传输，所以他们有时将较窄的带聚合在一起以提供给定质量的无线服务。每个端口可以是一个分量载波，以及通过组合多个分量载波，可以完成两个到五个载波的载波聚合以形成更宽的传输带。然而，一般只在那些分量载波中的一个（称为主要分量载波）上提供所有质量信息。这意味着，由于载波的更大数量和载波聚合所支持的主要资源块的更大的最大数量，所以必须在一个分量载波上提供大量质量反馈信息。具体地，可使用高达20个主要资源块以及在主要分量载波上提供所有那些资源块的所有质量信息。
由于用于质量传输的主要资源块的有限数量，希望增加用于CSI传输的容量，这通常使用物理上行链路共享信道（PUSCH）。（应注意，在其它实施例中可能不使用物理上行链路控制信道（PUCCH）或者某一其它的同等上行链路物理信道并无特殊理由）。
因此，一般当下载控制信息为格式0或者格式4时，这引起本文中描述的上行链路控制信息的传输的触发。
现在，对于下载控制信息格式0，在两种情况之一中触发PUSCH上的仅CQI的传输。在第一情况中，如果信道质量指数请求字段为1位且信道质量指数请求字段为1，以及I_MSC=29且主要资源块的数量小于或等于4，则触发将发生。
在对于下行链路控制信息格式0的另一情况中，代替地，如果信道质量指数请求字段为2位，则在以下情况中传输将被触发。如果信道质量指数请求字段为01、10或11，以及如果单个下行链路分量载波被报告、I_MCS=29且主要资源块的数量小于或等于4，则传输将被触发。然而，如果有多个下行链路分量载波被报告，则如果I_MCS=29且主要资源块的数量小于或等于20就是可允许的。
另一方面，对于下载控制信息格式4，PUSCH上的仅CQI的传输在以下情况下被触发。首先，下行链路控制信息格式必须指示仅启用一个传输块。然后，如果信道质量指数请求字段为1位，则信道质量指数请求字段必须为1，以及对于所启用的传输块，I_MCS必须等于29以及可编程资源块的数量必须小于或等于4。然而，如果信道质量指数请求字段为2位，则信道质量请求字段必须为01、10或11。然后，如果对于所启用的传输块，单个下行链路分量载波被报告，则I_MCS必须是29以及可编程资源块的数量必须小于或等于4。然而，如果多个下行链路分量载波被报告，则对于所启用的传输块，I_MCS必须是29以及可编程资源块的数量必须小于或等于20。
在图5A中所示的情况中，一个码字被映射到两层，初始数据传输包含两个码字。该映射已经可用于数据传输以及当初始数据传输包含两个码字并且码字的数据重新传输被映射到两层时被使用。
在一些实施例中，用于上行链路控制信息的调制方案可以限于QPSK。然而，诸如16QAM的其它调制也可用于一些实施例中。
在图5B和图5C中所示的实施例中，信道状态信息位首先被分割然后被编码为两个码字。每个码字然后被独立地映射到一层。在支持用于这两个码字的不同的公共调制方案的一个选择中，这两个码字使用相同的MCS，诸如QPSK。因此，在一些实施例中，QPSK或者一些其它的调制方案可以用于两层。在这样的情况中，不支持链路适配。在链路适配中，能基于当时的信道条件来即时改变调制方案。在一些实施例中，除了QPSK之外还可以使用的其它调制，诸如16QAM。
作为使用两个码字和两层以及一个MCS的另一个示例，可以使用如图5C中指示的支持链路适配的两个码字。这涉及改变MCS，例如作为一个示例，在QPSK和16QAM之间改变，而没有显式信令。能基于PUSCH上的秩2上行链路数据传输中使用的那两个MCS来得到调制方案，这对于用户设备和eNodeB是已知的，并且通过应用为用户设备和eNodeB预定义的相同规则而得到。该规则可以是选择那两个MCS中的最低阶的调制，以作为保守的示例，或者，例如通过某种平均来选择，其中当那两个MCS是两个具体的调制方案时选择一个调制方案。
只有当上行链路信道条件足够好到对于数据和信道状态信息本身支持高于1的秩时，以高于1的秩在PUSCH上传输信道状态信息才可能是有帮助的。
当然，图5B和图5C的示例有时可能是次最佳的，例如当调制方案被保守地选取为QPSK时。因此，虽然传输更健壮，但是如果容量不能增加则无法利用好的信道条件。在图5C的实施例中，调制方案可以比QPSK更高阶，但因为那两个码字经历不同的信道，所以它们将具有不同的错误概率以及***的性能可依赖于经历最差的信道的码字的性能。
例如，考虑以下情况：第一码字的信道条件不足够好且只能支持利用QPSK的传输，而第二码字经历支持64QAM传输的好的信道条件。在图5B的实施例中，两个码字都使用QPSK，这不利于传输第二码字。类似地，在图5C中的选择中，16QAM可以作为QPSK和64QAM的平均来用于码字，因此，对于该码字的错误概率可能高。
因此，在图5D的实施例中，两个码字和两层与层移位一起使用。图3中示出层移位，其中第一层（层1）和第二层（层2）被提供给层移位器29，层移位器29通过混合每个码字的那四个所描绘的调制符号来产生两个输出层。具体地，在该示例中来自层2的第一和第三符号与层1的第二和第四符号交织，以此类推。也可使用其它移位技术。
因此，如图2中所示，第一码字CW1和第二码字CW2在加扰级24受到并行加扰。加扰随机地改变位顺序。然后，这两个码字在调制映射器26中受到并行调制映射。调制映射器26将位映射到调制符号，诸如与16QAM关联的那些。接下来，对两个码字同时完成在28的层映射。然后来自层映射的输出被提供给改变已描述的位序列的层移位器30。此后，这两个移位的层被提供给分开的并行的变换预编码器32。接下来，在34完成预编码，然后在资源元素映射器36对每层分开地进行资源元素映射。资源元素映射器36确定主要资源块如何被分配给每个用户。最后，在38按照SC-FDMA发生信号生成。然后每个信号被传输给MMIO***中的适当的天线端口。
层移位的一个好处是在这两个码字之间提供额外的分集。当读者考虑先前的示例时该好处显而易见。当应用层移位器时，两个码字的一些符号将经历更好的信道且这将帮助***增加正确解码的概率。因此，在一些实施例中，该方案可具有更好的性能。
最后，如图5E中所指示，可与两层和两个MCS一起使用两个码字。可以为不同的码字使用不同的调制方案。例如，通过为第二传输块使用I_MCS以同时用信号通知两个MCS，不同的调制可以被考虑并且被用信号通知。因此，在一些实施例中，可以更充分地利用好的信道条件。
图4中示出的计算机***130可包括硬驱动器134和可移动介质136，其通过总线104耦合到芯片集核心逻辑110。该计算机***可以是任何计算机***，包括智能移动设备，诸如智能电话、平板或移动互联网设备。键盘和鼠标120或其它常规组件可以通过总线108耦合到芯片集核心逻辑。在一个实施例中，核心逻辑可通过总线105耦合到图形处理器112以及应用处理器100。图形处理器112也可通过总线106耦合到帧缓冲器114。帧缓冲器114可通过总线107耦合到显示屏118，诸如液晶显示（LCD）触摸屏。在一个实施例中，图形处理器112可以是使用单指令多数据（SIMD）架构的多线程、多核并行处理器。
芯片集逻辑110可包括耦合主存储器132的非易失性存储器端口。在一个实施例中，多个天线121、122也可以耦合到逻辑110以实现多输入多输出（MIMO）。扬声器124也可通过逻辑110来耦合。
本说明书全文中对“一个实施例”或“实施例”的提及意味着结合该实施例描述的具体特征、结构或特性包含在本发明中包括的至少一个实现中。因此，短语“一个实施例”或“在实施例中”的出现不一定指相同的实施例。此外，可以用除了所说明的具体实施例外的其它合适形式来实施这些具体特征、结构或特性，以及所有这样的形式可包括在本申请的权利要求书的范围内。
虽然已关于有限数量的实施例对本发明进行了描述，但是本领域技术人员将从其中认识到大量修改和变化。所附权利要求书意在覆盖落入本发明真正精神和范围内的所有这样的修改和变化。

Claims (22)

1. 一种方法，包括：
非周期性地提供信道质量信息；以及
使用具有至少两层的物理上行链路共享信道来提供所述信息。
2. 根据权利要求1所述的方法，包括将两层与两个调制编码方案一起使用来提供信道质量信息。
3. 根据权利要求1所述的方法，包括使用至少两个码字。
4. 根据权利要求3所述的方法，包括使用链路适配。
5. 根据权利要求3所述的方法，包括使用层移位。
6. 根据权利要求3所述的方法，包括将至少两层与两个调制编码方案一起使用。
7. 根据权利要求1所述的方法，包括在两个不同的层上发送相同的码字。
8. 一种存储指令的非短暂性计算机可读介质，所述指令使得处理器能够：
非周期性地提供信道质量信息；以及
在具有至少两层的物理上行链路共享信道上发送所述信息。
9. 根据权利要求8所述的介质，还存储将两层与两个调制编码方案一起使用来提供信道质量信息的指令。
10. 根据权利要求8所述的介质，还存储使用至少两个码字的指令。
11. 根据权利要求10所述的介质，还存储使用链路适配的指令。
12. 根据权利要求10所述的介质，还存储使用层移位的指令。
13. 根据权利要求10所述的介质，还存储将至少两层与两个调制编码方案一起使用的指令。
14. 根据权利要求8所述的介质，还存储在两个不同的层上发送相同的码字的指令。
15. 一种移动台，包括：
用于非周期性地提供信道质量信息的处理器；以及
用于在具有至少两层的物理上行链路共享信道上发送所述信息的无线收发器。
16. 根据权利要求15所述的台，所述处理器用于将两层与两个调制编码方案一起使用来提供信道质量信息。
17. 根据权利要求15所述的台，所述处理器用于使用至少两个码字。
18. 根据权利要求17所述的台，所述处理器用于使用链路适配。
19. 根据权利要求17所述的台，所述处理器用于使用层移位。
20. 根据权利要求17所述的台，所述处理器用于将至少两层与两个调制编码方案一起使用。
21. 根据权利要求15所述的台，所述处理器用于在两个不同的层上发送相同的码字。
22. 根据权利要求15所述的台，所述台是用户设备。
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Application publication date: 20140423