CN102696191B - 用于在物理上行共享信道上复用上行控制信息的方法 - Google Patents

用于在物理上行共享信道上复用上行控制信息的方法 Download PDF

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CN102696191B
CN102696191B CN201180001083.0A CN201180001083A CN102696191B CN 102696191 B CN102696191 B CN 102696191B CN 201180001083 A CN201180001083 A CN 201180001083A CN 102696191 B CN102696191 B CN 102696191B
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李书鹏
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    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621Feedback content
    • H04B7/0632Channel quality parameters, e.g. channel quality indicator [CQI]
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    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
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    • H04L5/0053Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055Physical resource allocation for ACK/NACK
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Abstract

一种选择用于UCI传输的资源元件和对抗乒乓效应的方法包括调整传输参数而不调整信道质量指示符/预编码矩阵索引。传输参数包括传送块的调制编码集和传送块尺寸。另一种选择用于UCI传输的资源元件和对抗乒乓效应的方法包括选择具有最高调制编码集索引的传送块或具有最低调制编码集索引的传送块。可选地,演进节点B可以选择具有最大尺寸的传送块或具有最小尺寸的传送块。

Description

用于在物理上行共享信道上复用上行控制信息的方法
优先权
要求于2010年8月13日递交的第61/373,587号美国临时专利申请的优先权,其全部公开通过引用被并入本文。
发明领域
本发明的领域是无线通信,且更具体地,是在长期演进高级***内的上行控制信息。
背景
第三代合作伙伴计划(“3GPP”)规定了用于支持无线宽带数据服务的演进通用地面陆地无线接入(“E-UTRA”)。E-UTRA也被称为长期演进(“LTE”),并且是移动网络技术中的标准。3GPP使用平行释放***来提供稳定的实施平台并且允许增加新特征。
高级长期演进(“LTE-A”)在3GPP中开始。技术规范组-无线接入网络工作组1(“TSG-RANWG1”)部分地负责用户设备(“UE”)的无线接口的物理层、通用陆地无线接入网络(“UTRAN”)和演进UTRAN的规范,涵盖无线接口的频分复用(“FDD”)和时分复用(“TDD”)模式。
在单用户多输入多输出(“SU-MIMO”)***的情况下,TSG-RANWG1在物理上行共享信道(“PUSCH”)上处理上行控制信息(“UCI”)。TSG-RANWG1还描述用于计算等级指示符(RI)、信道质量指示符/预编码矩阵索引(“CQI/PMI”)和肯定应答/否定应答(“ACK/NACK”)代码的每层资源的公式。
但是,存在某些独特的场景,TSG-RANWG1没有对这些场景描述用于计算RI、CQI/PMI和ACK/NACK代码的每层资源的公式。另外,乒乓效应和对多β值上的解决尚须被适当地处理。因此,需要用于对抗乒乓效应、选择代码字以传输CQI/PMI、复用UCI和每代码字数据、并处理用于确定ACK/NACK代码和RI的某些场景的方法。
发明概述
本发明目的在于在物理上行共享信道上复用上行控制信息的方法。
在本发明的第一个单独的方面,为了对抗乒乓效应,演进节点B调整传送块的调制编码集或传送块尺寸而不调整信道质量指示符/预编码矩阵索引。
在本发明的第二个单独的方面,为了对抗乒乓效应,演进节点B选择用于信道质量指示符/预编码矩阵索引传输的传送块。演进节点B可以选择具有最高调制编码集索引的传送块或者具有最低调制编码集索引的传送块。可选地,演进节点B可以选择具有最大尺寸的传送块或具有最小尺寸的传送块。
在本发明的第三个单独的方面,使用户设备在单用户多输入多输出模式中,选择代码字以传输信道质量指示符/预编码矩阵索引。在控制信道上禁用第一代码字。用户设备然后选择传送块以传输信道质量指示符/预编码矩阵索引。
在本发明的第四个单独的方面,在物理下行控制信道上复用信道质量指示符/预编码矩阵索引和数据的虚拟单元序列。虚拟单元序列然后与肯定应答/否定应答代码、等级指示符和新数据交织。
实施方式的另外的方面和优点将从对优选的实施方案的描述中呈现。
优选实施方案的详细描述
除非以下另有说明,接下来的描述基于下面的假设。首先,与最高调制编码集索引或最大传送块尺寸相关的传送块被上行授予(uplinkgrant)指示。但是,如果与其他方式比较时识别出较大的性能损失,则可回到这个假设。另外,当两个传送块的调制编码集(“MCS”)或传送块尺寸都相同时,这两个传送块的第一个是优选的。最后,在与最高MCS索引或最大传送块尺寸关联的传送块上传输CQI/PMI。这个传送块可以由用于两个传送块传输的上行授予指示。
处理乒乓效应
乒乓效应是UCI的引入使两个传送块之间的MCS的顺序反转的情况。当演进节点B(eNB)调整具有UCI的多个传送块中的一个的MCS时,这个效应可以发生。
在初始PUSCH传输期间,当CQI/PMI开销特别地大或小时通常不会发生乒乓效应,无论eNB是否在链路适应中考虑CQI/PMI开销。但是,当CQI/PMI开销大时,eNB可以配置较大的PUSCH偏移参数以确保CQI/PMI的质量。当两个传送块的MCS或传送块尺寸相对接近时,乒乓效应可以发生。
乒乓效应可使用多种方法解决。在第一种方法中,基线不改变,并且因此不需要被指定。例如,eNB可调整特定传送块的MCS或传送块尺寸而不调整CQI/PMI。但是,这个方法可能影响数据块出错率(BLER)。
在第二种方法中,乒乓效应可以通过降低对数据的影响的标准化方法解决。在一种这样的标准化方法下,当某些条件满足时(例如当一个传送块的MCS索引在与UCI复用后保持最高时),对CQI/PMI传输选择具有最高MCS或最大传送块尺寸的传送块。否则,对CQI/PMI传输选择具有最低MCS索引或最小传送块尺寸的传送块。但是,这种方法相当复杂。
在另一种标准化方法中,对CQI/PMI传输选择的传送块可以通过上行授予指示。例如,1比特传送块到代码字交换、1比特跳跃标志、或者其他指示符可以被使用。这些比特可以用于指示对CQI/PMI传输选择的传送块或者当乒乓效应发生时指示所选择的方案。例如,在默认情况下,CQI将经由与较高MCS索引关联的代码字被传输,但是如果传送块到代码字交换比特被设置,那么CQI经由与较低MCS索引关联的代码字被传输。
在PUSCH重发中乒乓效应通常不会发生,因为eNB不需要考虑相同PUSCH的初始传输的CQI/PMI开销。该效应也不存在,因为用于重发的传送块的传送块尺寸与用于初始传输的相同。
对CQI/PMI传输选择代码字
在第一个场景中,用户设备是在SU-MIMO模式中,少量数据要传输。如果一个代码字被物理下行控制信道(“PDCCH”)禁用,可在所启用的代码字的对应传送块上复用CQI/PMI。否则,如果仅对UCI传输启用一个代码字,应该在所启用的代码字的对应传送块上传输CQI/PMI,并且应该在另一个代码字的对应传送块上传输数据。
与上面的第一个场景类似,在第二个场景中,用户设备是在SU-MIMO模式中。但是,在这第二个场景中,没有数据要被传输。如果一个代码字被PDCCH禁用,可在所启用的代码字的对应传送块上传输CQI/PMI。否则,用户设备可选择第一传送块以传输CQI/PMI。
在第三个场景中,MCS或者传送块尺寸对于两个传送块是相同的。在这个情况下,就像在上面的第二个场景中一样,用户设备可选择第一个传送块来传输CQI/PMI。
对每代码字UCI和数据的复用
不同层的UCI和数据属于构成虚拟单元序列的特定的传送块。这些虚拟单元序列根据在3GPPRelease8(Rel-8)中描述的方法被复用。这些复用的虚拟单元序列的输出是新数据的虚拟单元序列。如果该特定的传送块没有被选择用于CQI/PMI,新数据的虚拟单元序列与在被复用之前的数据的虚拟单元序列相同。
根据Rel-8中描述的方法,ACK/NACK代码、RI和/或新数据的虚拟单元序列被交织。交织器的尺寸是C*R,其中C表示使用的子载波数量,而R表示单载波频分多址(SC-FDMA)。该交织器的输出是具有长度C*R的虚拟单元序列,其被逐列读取。
使用这种方法,可根据Rel-8重新使用数据处理和控制复用以及信道交织。但是,这种方法需要构成可通过信道编码来处理的虚拟单元序列。例如,在Rel-8中,RI的信道编码的矢量序列输出由表示,其中,Q′RI=QRI/Qm并且在3GPPRelease10(Rel-10)中,等级信息的信道编码的虚拟单元序列输出是 q ‾ ‾ k RI = [ q ‾ k RI layer 0 q ‾ k RI layer 1 ] = [ q i RI layer 0 · · · q i + Q m - 1 RI layer 0 q i RI layer 1 · · · q i + Q m - 1 RI layer 1 ] T .
计算ACK/NACK和RI的每层资源
在第一场景中,在公式 β offset PUSCH = β offset _ one _ CW ACK N TB = 1 β offset _ n _ CW ACK N TB > 1 中的计算ACK/NACK和RI的每层资源的可以替代地是OCQI-min,其中传送块只用于CQI/PMI传输。
在上面的公式中,O是ACK/NACK、RI或CQI比特的数量,是对被表示为子载波的数量的同一传送块的最初预定的带宽;是在子载波的单元内对当前PUSCH的预定的带宽;C是传送块的代码块的数量;Kr是对代码块号r的比特的数量;是由较高层配置的偏移;是在用于初始PUSCH传输的子帧中单载波-频分复用(SC-FDM)符号的数量;是在当前PUSCH传输子帧中SC-FDM符号的数量;L是循环冗余校验(“CRC”)比特(对于CQIL=8)的数量;是对由较高层配置的单层传输的偏移值;是对由较高层配置的多层传输的偏移值;并且NTB是与特定的传送块对应的数量。
在第二个场景中,用于计算ACK/NACK和RI的每层资源的公式与在Rel-8中用于计算没有数据的ACK/NACK和RI的资源的公式相同。
尽管这个发明的实施方案已经被示出和描述,多得多的更改是可能的,而不偏离本文的发明思想,这一点对本领域技术人员来说是明显的。因此,本发明并不被限制,除了在所附的权利要求的精神内以外。

Claims (5)

1.一种对抗乒乓效应的方法,所述方法包括:
由演进节点B调整传输参数,其中所述传输参数包含传送块的调制编码集和传送块尺寸中的至少一个,其中演进节点B不调整信道质量指示符/预编码矩阵索引;选择代码字以传输信道质量指示符/预编码矩阵索引,在物理下行控制信道上禁用第一代码字;以及在与第二代码字对应的传送块上复用或传输所述信道质量指示符/预编码矩阵索引;
当用户设备在单用户多输入多输出模式中存在数据要传输时,如果在物理下行控制信道上禁用第一代码字,则在所启用的第二代码字的对应传送块上复用所述信道质量指示符/预编码矩阵索引;否则,如果仅对上行控制信息传输启用一个代码字,则在所启用的代码字的对应传送块上传输所述信道质量指示符/预编码矩阵索引,并且在其他代码字的对应传送块上传输数据。
2.一种在无线***中对抗乒乓效应的方法,所述方法包括:
在演进节点B选择具有最高调制编码集索引、最低调制编码集索引、最大传送块尺寸、或最小传送块尺寸中的一个的传送块;
通过上行授予传输所选择的传送块的指示;
其中,所述上行授予包括传送块到代码字交换;
其中,在默认情况下,信道质量指示符将经由与较高调制编码集索引关联的代码字被传输;如果传送块到代码字交换比特被设置,则信道质量指示符经由与较低调制编码集索引关联的代码字被传输。
3.一种对抗乒乓效应的***,所述***包括:
用于调整传输参数的装置,其中所述传输参数包含传送块的调制编码集和传送块尺寸中的至少一个,其中该装置不调整信道质量指示符/预编码矩阵索引;选择代码字以传输信道质量指示符/预编码矩阵索引,在物理下行控制信道上禁用第一代码字;以及在与第二代码字对应的传送块上复用或传输所述信道质量指示符/预编码矩阵索引;其中当用户设备在单用户多输入多输出模式中存在数据要传输时,如果在物理下行控制信道上禁用第一代码字,则在所启用的第二代码字的对应传送块上复用所述信道质量指示符/预编码矩阵索引;否则,如果仅对上行控制信息传输启用一个代码字,则在所启用的代码字的对应传送块上传输所述信道质量指示符/预编码矩阵索引,并且在其他代码字的对应传送块上传输数据。
4.一种在无线***中对抗乒乓效应的***,所述***包括:
用于选择具有最高调制编码集索引、最低调制编码集索引、最大传送块尺寸、和最小传送块尺寸中的一个的传送块的装置;
还包括用于通过上行授予传输所选择的传送块的指示的装置;
其中,所述上行授予包括传送块到代码字交换;
其中,在默认情况下,信道质量指示符将经由与较高调制编码集索引关联的代码字被传输;如果传送块到代码字交换比特被设置,则信道质量指示符经由与较低调制编码集索引关联的代码字被传输。
5.如权利要求4所述的***,其中所述上行授予包括一个比特跳跃标志。
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