CN102349240B - 多天线系统中发送用于干扰减轻的控制信息的方法和装置 - Google Patents

多天线系统中发送用于干扰减轻的控制信息的方法和装置 Download PDF

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CN102349240B
CN102349240B CN201080010955.5A CN201080010955A CN102349240B CN 102349240 B CN102349240 B CN 102349240B CN 201080010955 A CN201080010955 A CN 201080010955A CN 102349240 B CN102349240 B CN 102349240B
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pmi
interference
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CN102349240A (zh
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韩双锋
李炫又
崔虎圭
李美贤
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Samsung Electronics Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity 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
    • H04B7/0615—Diversity 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
    • H04B7/0619—Diversity 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
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity 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
    • H04B7/0615—Diversity 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
    • H04B7/0619—Diversity 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
    • H04B7/0658—Feedback reduction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/0026—Interference mitigation or co-ordination of multi-user interference
    • H04J11/003—Interference mitigation or co-ordination of multi-user interference at the transmitter
    • H04J11/0033—Interference mitigation or co-ordination of multi-user interference at the transmitter by pre-cancellation of known interference, e.g. using a matched filter, dirty paper coder or Thomlinson-Harashima precoder
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/005—Interference mitigation or co-ordination of intercell interference
    • H04J11/0053—Interference mitigation or co-ordination of intercell interference using co-ordinated multipoint transmission/reception
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03343—Arrangements at the transmitter end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/03777—Arrangements for removing intersymbol interference characterised by the signalling
    • H04L2025/03802—Signalling on the reverse channel
    • H04L2025/03808—Transmission of equaliser coefficients

Abstract

一种包括移动站和基站的多天线系统可操作来执行发送用于干扰减轻的控制信息的方法。移动站(MS)可以发送用于干扰减轻的控制信息。MS确定用于来自于相邻的基站(BS)的干扰的第一预编码矩阵索引(PMI)和第二PMI。基于来自第一PMI和第二PMI之一与码本中的剩余PMI之间的关联值的关联级别，MS确定PMI的子集的等级，并且反馈指示关联级别的信息。

Description

多天线系统中发送用于干扰减轻的控制信息的方法和装置
技术领域
本发明涉及多天线系统。更具体地，本发明涉及在多天线系统中发送用于干扰减轻的控制信息的方法和装置。
背景技术
正交频分复用(OFDM)和多天线(即，多输入多输出(MIMO))技术由于它在长期演进(LTE)及电气和电子工程师学会(IEEE)802.16标准中的高的谱效率，已经引起了广泛的注意。
在理想的频率同步下，基于OFDM的系统不会遭受小区内多路复用的用户之间的干扰。但是，对于多小区环境，引起相邻小区之间的小区间干扰(ICI)，其严重降低了小区边缘用户性能。
小区间干扰减轻技术一般分类为三种类型：干扰随机化、干扰消除、和干扰协调。干扰随机化目的在于将干扰随机化并且允许通过处理增益进行干扰减轻。干扰消除技术被提出以通过使用多天线技术或交织分割多址(IDMA)方案在接收器处消除干扰。干扰协调基于这样的构思——精心设计的相邻小区中的移动站(MS)之间资源的协调可以降低干扰并且提高小区边缘处的用户容量和覆盖。
图1示出根据传统技术的MIMO系统中小区边缘MS体验的小区间干扰。
参考图1，假定服务BS100和干扰BS120使用相同的码本来预编码，并且通过中枢网络彼此连接。此外，在服务BS100和干扰BS120使用相同的频带发送数据的环境中，位于服务BS100的小区边缘处的MS110遭受来自于作为相邻的BS的干扰BS120的干扰。H1105是服务BS100与MS110之间的信道矩阵，H2115是干扰BS120与MS110之间的信道矩阵。
为了减轻干扰，MS110搜索用于引起高干扰的预编码矩阵索引(PMI)(下文中称为‘最差PMI’)或引起低干扰的PMI(下文中称为‘最佳PMI’)的参考信号。MS110可以将搜索到的最差或最佳PMI反馈给服务BS100，然后服务BS100向干扰BS120通知从MS110反馈的最差或最佳PMI。干扰BS120限制它正在使用的PMI当中的反馈的最差PMI(下文中称为‘PMI限制’)或使用它正在使用的PMI当中的反馈的最佳PMI(下文中称为‘PMI推荐’)，从而能够减轻MS110的干扰。
但是，仅仅反馈最差或最佳PMI来减轻干扰不是足够的，因为除最差PMI之外的其它PMI也可能引起MS110的干扰，而且除最佳PMI之外的其它PMI也可能适用于干扰减轻。因此，如果可以反馈多个PMI以用于PMI限制或推荐，则更优选。但是，困难之处在于从MS110到服务BS100的PMI子集的反馈将引起太多的开销。
因而，需要多天线系统中用于干扰消除的高效PMI反馈的方法和装置。
发明内容
为了解决现有技术的上述缺陷，本发明的主要方面是至少解决上述问题和/或缺点并且至少提供如下所述的优点。因此，本发明的一方面在于提供在多天线系统中有效发送控制信息以用于干扰消除的方法以及装置。
本发明的另一方面在于提供多天线系统中在预编码矩阵索引(PMI)反馈时减小开销的方法和装置。
上述方面通过提供在多天线系统中发送用于干扰减轻的控制信息的方法和装置实现。
根据本发明的一方面，提供一种在多天线系统中发送用于干扰减轻的控制信息的移动站(MS)操作方法。该方法包括：确定用于来自于相邻基站(BS)的干扰的第一PMI和第二PMI之一；基于来自第一PMI和第二PMI之一与码本中的剩余PMI之间的关联值的关联级别，确定PMI的子集的尺寸；以及反馈指示与PMI的子集的尺寸对应的关联级别的信息。
根据本发明的另一方面，提供一种在多天线系统中发送用于干扰减轻的控制信息的服务BS操作方法。该方法包括：从至少一个或多个MS接收指示PMI的子集的级别的关联级别；以及与相邻的BS交换从该至少一个或多个MS接收的PMI子集信息，并协调相邻的BS的PMI使用。
根据本发明的另一方面，提供一种在多天线系统中发送用于干扰减轻的控制信息的干扰BS操作方法。该方法包括：从相应的BS接收关联级别和第一PMI或第二PMI；以及使用该关联级别和第一PMI或第二PMI确定PMI子集。
根据本发明的另一方面，提供一种发送用于干扰减轻的控制信息的多天线系统。该系统包括多个MS和服务BS。基于第一PMI和第二PMI之一与码本中的剩余PMI之间的关联级别，该多个MS反馈用于来自于相邻BS的干扰的多个PMI子集。基于从该多个MS反馈的多个PMI子集，该服务BS与相邻的BS交换，并协调相邻的BS的PMI使用。
根据本发明的另一方面，提供一种在多天线系统中发送用于干扰减轻的控制信息的MS操作方法。该方法包括：分别确定第一PMI和第二PMI之一与码本中的剩余PMI之间的关联；以递增的次序将关联值排序；确定排序的关联值当中要反馈的至少一个或多个关联值的数量；反馈用于干扰减轻的相关信息，其包括指示确定的关联值的数量的关联级别。
根据本发明的另一方面，提供一种在多天线系统中发送用于干扰减轻的控制信息的服务BS操作方法。该方法包括：从至少一个或多个MS接收指示PMI的子集的级别的关联级别；基于该关联级别构造推荐的PMI子集和限制的PMI子集；以及向相邻的BS发送推荐的PMI子集和限制的PMI子集并协调相邻的BS的PMI使用。
在进行以下对本发明的详细描述之前，阐述本专利文件全文使用的某些词和短语的定义可以是有益的：术语“包含”和“包括”及其变体意味着无限制地包括；术语“或”是包含性的，意味着和/或；短语“与...关联”和“与其关联”及其变体可以意味着包括、包括在...内、与...互连、包含、包含在...内、连接到或与...连接、耦接到或与...耦接、能够与...通信、与...协作、交织、并置、接近于、绑定到或与...绑定、具有、具有...的属性等；而术语“控制器”意味着控制至少一个操作的任何设备、系统或其部件，这样的设备可以实现为硬件、固件或软件、或其中至少两个的一些组合。应当注意，与任何特定的控制器相关的功能可以是集中式的或分布式的，不管本地还是远程。本专利文件全文提供某些词和短语的定义，本领域技术人员应当理解，在许多情况下(如果不是大多数情况)，这样的定义适用于这样定义的词和短语的先前以及将来的运用。
附图说明
通过下面结合附图的详细描述，本发明的上述及其它目的、特征和优点将更加明显，其中：
图1示出多输入多输出(MIMO)系统中小区边缘移动站(MS)体验的小区间干扰；
图2示出根据本发明的示范性实施例的在多天线系统中发送用于干扰减轻的控制信息的MS操作；
图3示出根据本发明的示范性实施例的在多天线系统中发送用于干扰减轻的控制信息的服务基站(BS)操作；
图4示出根据本发明的示范性实施例的在多天线系统中发送用于干扰减轻的控制信息的干扰BS操作；
图5示出根据本发明的示范性实施例的在多天线系统中发送用于干扰减轻的控制信息的过程；
图6示出根据本发明的每个PMI的信道功率与每个剩余PMI和最差PMI的关联的关系的图；
图7示出根据本发明的每个PMI的信道功率与每个剩余PMI和最佳PMI的关联的关系的图；
图8示出根据本发明的每个PMI的平均信道功率与每个剩余PMI和最差PMI的关联的关系的图；以及
图9示出根据本发明的每个PMI的平均信道功率与每个剩余PMI和最佳PMI的关联的关系的图。
具体实施方式
本专利文件中下面讨论的图1到9以及用于描述本公开的原理的各种实施例仅仅是示例的方式，并且不应该以任何方式被理解为限制本公开的范围。本领域技术人员将理解，本公开的原理可以在任何适当配置的通信系统中实现。
下面将在这里参考附图描述本发明的优选实施例。在下面的描述中，将省略公知的功能或构造的详细描述，因为它们将不必要详细地混淆本发明。此外，根据本发明的功能定义这里使用的术语。因而，术语可以根据用户或操作者的目的或实践而变化。因此，应当基于这里进行的描述理解这里使用的术语。
下面描述根据本发明的示范性实施例的在多天线系统中发送用于干扰减轻的控制信息的方法和装置。具体地，下面描述用于干扰减轻的预编码矩阵索引(PMI)反馈的方法和装置。
图2示出根据本发明的示范性实施例的在多天线系统中发送用于干扰减轻的控制信息的MS操作。
参考图2，在步骤200，MS基于参考信号测量主要的下行链路(DL)干扰信道，并基于码本中的每个PMI(w1，w2，...，wN)确定主要的干扰链路的可能的干扰功率。
然后，在步骤202，MS从主要的干扰链路的可能的干扰功率确定最差或最佳PMI。例如，MS将引起相邻的BS中的最高干扰的PMI确定为最差PMI，并将减轻相邻的BS中的干扰的PMI确定为最佳PMI。
然后，在步骤204，MS确定已确定的最差或最佳PMI与每个剩余PMI之间的关联。假定最差或最佳PMI等于‘wk’，可以在下面等式1中给出递减次序的‘N’个不同的关联值(ρ1，k，ρ2，k，...，ρN，k)。在最差或最佳PMI与剩余PMI之间的关联值当中可以存在至少一个或多个相同的关联值。即，具有关联值(ρi，k)的PMI的数量可以是一个或多个。
ρi，k＝|(wi)H×wk|i＝1，...，N，i≠k[等式1]
等式1中，‘ρi，k’是‘wk’与第i个PMI之间的关联值，‘N’是码本中的PMI的数量，而‘H’是共轭转置矩阵。这里，假定存在‘M’个不同的关联值(r1，...，rM)。剩余PMI可以具有与最差或最佳PMI相同的关联。
MS可以通过使用最差或最佳PMI与剩余PMI之间的关联来减小PMI子集的反馈的开销。剩余PMI和最差或最佳PMI的关联与信道功率之间的关系在下面的图6到9中描述。
然后，在步骤206，基于接收的信号干扰噪声比(SINR)和与不同的PMI关联的干扰功率，MS确定推荐减轻相邻的BS中的干扰的PMI(下文中称为‘PMI推荐’)还是限制引起相邻的BS中的干扰的PMI(下文中称为‘PMI限制’)，并使用两个码字之一通过反馈信道反馈该结果作为事件驱动反馈报告。例如，在利用两个码字(a，b)表示1位指示符的情况下，如果发送码字(a)，则它是‘1’，而如果发送码字(b)，则是‘0’。
例如，MS在遭受来自于相邻的BS的高干扰的环境中选择PMI限制，而且在需要来自于相邻的BS的干扰减轻的环境中选择PMI推荐。
根据实施方式，可以将确定PMI推荐和PMI限制之一的结果与其它相关信息(即，最差或最佳PMI和确定PMI子集的关联级别)一起反馈给服务BS。
然后，在步骤208，基于接收的SINR和目标SINR，MS确定应当反馈多少个关联值。换句话说，按次序或按极大地减轻干扰的次序，MS在按递减次序排序的关联值(r1，...，rM)当中选择引起最高干扰的预定数量的关联值。
这里，MS发送关联级别(假定为一位)，而不反馈真实的关联值。例如，对于PMI限制，当仅仅反馈与按递减次序排序的剩余PMI和最差PMI的关联值(r1，...，rM)当中的关联值(r1)对应的PMI子集时，MS反馈控制比特‘1’作为关联级别，而当反馈各自与关联值(r1，...，rM)当中的关联值(r1)和(r2)对应的PMI子集时，反馈控制比特‘0’。根据实施方式，假定关联级别为两位，则当反馈与关联值(r1)对应的PMI子集时，MS反馈控制位‘00’作为关联级别，而当反馈各自与关联值(r1)和(r2)对应的PMI子集时，反馈控制位‘01’，而当反馈各自与关联值(r1)、(r2)和(r3)对应的PMI子集时，反馈控制位‘10’，而当反馈各自与关联值(r1)、(r2)、(r3)和(r4)对应的PMI子集时，反馈控制位‘11’。
然后，在步骤210，MS向服务BS反馈用于干扰减轻的相关信息(即，最差或最佳PMI、确定PMI子集的关联级别、以及指示是推荐还是限制与关联级别对应的PMI子集的信息位)。MS通过关联级别确定与几个关联值对应的PMI子集。例如，当关联级别为一位时，MS可以构造两个PMI子集，而当关联级别为两位时，MS可以构造四个PMI子集。
根据实施方式，在步骤206选择PMI推荐之后，MS还可以反馈最佳PMI以及确定PMI子集的级别的关联级别，并额外反馈引起最高干扰功率的最差PMI。此外，MS可以反馈指示推荐的PMI子集(即，与关联值(rM)对应的PMI或与rM和rM-1对应的PMI)的附加信息位(即，一位)。
此后，MS终止根据本发明的示范性实施例的过程。
图3示出根据本发明的示范性实施例的在多天线系统中发送用于干扰减轻的控制信息的服务BS操作。
参考图3，在步骤300，服务BS从MS接收用于干扰限制和干扰减轻的相关信息。该相关信息可以为最差或最佳PMI、确定PMI子集的关联级别、指示是推荐还是限制与关联级别对应的PMI子集的信息，等等。例如，当关联级别等于‘1’时，限制或推荐对应于与最差或最佳PMI的关联(rM)的PMI。例如，当关联级别等于‘0’时，限制或推荐对应于与最差或最佳PMI的关联(rM和rM-1)的PMI。
然后，在步骤302，服务BS向干扰BS发送最差或最佳PMI、确定PMI子集的关联级别、以及指示是推荐还是限制与关联级别对应的PMI子集的信息。根据实施方式，服务BS还可以从最差或最佳PMI和确定PMI子集的关联级别确定PMI子集，并且向干扰BS发送推荐或限制的PMI子集。服务BS具有与MS相同的关于关联值与PMI之间的关系的信息，因而服务BS可以根据从MS反馈的关联级别确定相应的PMI子集。
此后，服务BS终止根据本发明的示范性实施例的过程。
图4示出根据本发明的示范性实施例的在多天线系统中发送用于干扰减轻的控制信息的干扰BS操作。
参考图4，在步骤400，干扰BS从服务BS接收相关信息(例如，最差或最佳PMI以及确定PMI子集的关联级别)。根据实施方式，干扰BS可以从服务BS直接接收限制或推荐的PMI子集。
在步骤402，干扰BS从相关信息确定PMI子集，并且限制确定的用于PMI限制的PMI子集的使用或推荐确定的用于PMI推荐的PMI子集的使用。
此后，干扰BS终止根据本发明的示范性实施例的过程。
图5示出根据本发明的示范性实施例的在多天线系统中发送用于干扰减轻的控制信息的过程。
参考图5，在步骤500，MS分别从服务BS和相邻的BS接收参考信号。然后，在步骤502，MS测量主要的DL干扰信道。然后，在步骤504，MS确定对于码本中的所有PMI的干扰功率。
此后，在步骤506，MS从主要的干扰链路的可能的干扰功率确定最差或最佳PMI，并确定已确定的最差或最佳PMI与每个剩余PMI之间的关联。
然后，在步骤508，基于接收的SINR和与剩余PMI关联的干扰功率，MS确定是推荐减轻相邻的BS中的干扰的PMI(PMI推荐)还是限制引起相邻的BS中的干扰的PMI(PMI限制)，而且基于接收的SINR和目标SINR，该MS确定应当反馈多少个关联值。
此后，在步骤510，MS向服务BS反馈用于干扰减轻的相关信息(即，最差或最佳PMI、确定PMI子集的关联级别、以及指示是推荐还是限制与关联级别对应的PMI子集的信息位)。MS通过关联级别确定与几个关联值对应的PMI子集。例如，当关联级别为一位时，MS可以构造两个PMI子集，而当关联级别为两位时，MS可以构造四个PMI子集。
根据实施方式，在确定PMI推荐或PMI限制之后，MS还可以使用两个码字之一通过单独的反馈信道反馈结果。
在步骤512，服务BS将从MS反馈的用于干扰减轻的相关信息递送到相邻的BS。根据实施方式，服务BS也可以根据从MS反馈的用于干扰减轻的相关信息确定推荐或限制的PMI子集，并将确定的PMI子集传送到相邻的BS。
在步骤514，在从服务BS提供用于干扰减轻的相关信息之后，相邻的BS从该相关信息确定限制或推荐的PMI子集。
图6示出在具有四个发送天线和两个接收天线(信道实现数量＝1)的环境中考虑总共十六个PMI时每个PMI的信道功率与每个剩余PMI和最差PMI的关联的关系。
横轴是以最差PMI与剩余PMI之间的关联增加排序的PMI索引，纵轴是相应的PMI的信道功率值。
假定最差PMI与PMI(0)之间的关联值等于‘ρ0’，最差PMI与PMI(1)之间的关联值等于‘ρ1’，...，而最差PMI与PMI(16)之间的关联值等于‘ρ16’，关联值的关系被给出为ρ0＜ρ1，..，＜ρ16。
图7示出在具有四个发送天线和两个接收天线(信道实现数量＝1)的环境中考虑总共十六个PMI时每个PMI的信道功率与每个剩余PMI和最佳PMI的关联的关系。
参考图7，横轴是以最佳PMI与剩余PMI之间的关联增加排序的PMI索引，纵轴是相应的PMI的信道功率值。
假定最佳PMI与PMI(0)之间的关联值等于‘ρ0’，最佳PMI与PMI(1)之间的关联值等于‘ρ1’，...，而最佳PMI与PMI(16)之间的关联值等于‘ρ16’，关联值的关系被给出为ρ0＜ρ1，..，＜ρ16。
从图6和7中可以理解，剩余PMI和最差或最佳PMI的关联与剩余PMI的信道功率之间的关系相当随机。由于这个原因，难以利用有限的开销向为其限制或推荐PMI的服务BS反馈PMI。
在信道实现等于‘1000’的实验环境中，当将所有相应信道功率相加并确定平均值时，获得如图7和8所示的依赖于关联的PMI的平均信道功率。
图8示出根据本发明的每个PMI的平均信道功率与剩余PMI和最差PMI1000关联之间的关系(信道实现数量＝1000)。
参考图8，在平均意义上，与PMI关联的信道功率随着最差PMI与剩余PMI之间的关联的增大而增大。最差PMI与剩余PMI之间的高关联意味着，与最差PMI类似，即便剩余PMI也可以引起相邻的BS中的高干扰。最差PMI与剩余PMI之间的低关联意味着，与最差PMI不同，剩余PMI不会引起相邻的BS中的高干扰。
图9示出根据本发明的每个PMI的平均信道功率与剩余PMI和最佳PMI的关联之间的关系(信道实现数量＝1000)。
参考图9，在平均意义上，与PMI关联的信道功率随着最佳PMI与剩余PMI之间的关联的增大而减小。最佳PMI与剩余PMI之间的高关联意味着，与最佳PMI类似，即便剩余PMI也可以减轻相邻的BS中的高干扰。最佳PMI与剩余PMI之间的低关联意味着，与最佳PMI不同，剩余PMI不能减轻相邻的BS中的高干扰。
本发明考虑基于平均意义上的关联的PMI反馈，但是由于与最差PMI的高关联而限制的PMI具有小的干扰功率以及由于与最佳PMI的高关联而推荐的PMI具有非常大的干扰功率也是可能的。
与PMI限制之前的干扰相比，利用最差PMI的PMI限制一般不保证将减小多少干扰。但是，在平均意义上，限制最差PMI可以减小来自于剩余PMI的平均干扰功率。为了进一步通过限制最差PMI提高性能改善，也可以反馈附加信息。
在平均意义上，推荐最佳PMI也可以基本上完全减小主要的干扰。但是，可能难以强迫干扰BS使用推荐的PMI，因为这可能引起对相邻的BS的大的干扰。因此，最好推荐可以引起对目标用户的可接受干扰的PMI子集，因为干扰BS可以从推荐的PMI子集中选择PMI用于它自己的用户。
如上所述，本发明的示范性实施例具有能够通过使用最佳PMI或最差PMI与剩余PMI之间的关联反馈PMI子集来减小开销的优点。此外，本发明的示范性实施例具有能够发送除最佳PMI或最差PMI之外的其它PMI并且有效减轻小区边缘MS的干扰的优点。
虽然尽管已经参考本发明的特定优选实施例示出和描述本发明，但是本领域技术人员应当理解，可以在其中进行形式和细节上的各种修改而不背离由所附权利要求书限定的本发明的精神和范围。

Claims (15)

1.一种在多天线系统中发送用于干扰减轻的控制信息的移动站(MS)操作方法，该方法包括：
确定(202)用于减轻来自于相邻的基站(BS)的干扰的预编码矩阵索引(PMI)；
基于所述PMI与码本中的每一个剩余PMI之间的关联值(204)，确定(206,208)与多个PMI的子集的尺寸相对应的关联级别，其中所述子集的尺寸指示用于减轻干扰的PMI的数量；以及
反馈(210)所述PMI以及与多个PMI的子集的尺寸相对应的关联级别。
2.一种在多天线系统中发送用于干扰减轻的控制信息的服务基站(BS)操作方法，该方法包括：
从至少一个或多个移动站(MS)接收(300)预编码矩阵索引(PMI)和与多个预编码矩阵索引(PMI)的子集的尺寸相对应的关联级别，其中所述子集的尺寸指示用于减轻干扰的PMI的数量；以及
与相邻的BS交换(302)关于所述多个PMI的子集的信息，并协调相邻的BS的预编码。
3.一种发送用于干扰减轻的控制信息的多天线系统，该系统包括：
至少一个移动站(MS)(110)，被配置为基于预编码矩阵索引(PMI)与码本中的每一个剩余PMI之间的关联值，反馈来自相邻的基站(BS)的用于干扰减轻的所述PMI和与多个PMI的子集的尺寸相对应的关联级别；以及
服务BS(100)，被配置为基于从至少一个MS反馈的所述PMI和与多个PMI的子集的尺寸相对应的关联级别，与相邻的BS交换关于多个PMI的子集的信息，并协调相邻的BS的预编码。
4.如权利要求1所述的方法，其中所述PMI是引起相邻的BS中的最高干扰的PMI和引起相邻的BS中的最低干扰的PMI中的一个PMI。
5.如权利要求2所述的方法，其中所述PMI是引起相邻的BS中的最高干扰的PMI和引起相邻的BS中的最低干扰的PMI中的一个PMI。
6.如权利要求3所述的系统，其中所述PMI是引起相邻的BS中的最高干扰的PMI和引起相邻的BS中的最低干扰的PMI中的一个PMI。
7.如权利要求1所述的方法，进一步包括：
分别确定PMI与码本中的每一个剩余PMI之间的关联值；以及
以递减次序对所述关联值排序。
8.如权利要求1所述的方法，其中该PMI子集包含多个推荐的PMI和多个限制的PMI，以及
其中所述关联级别为两个固定的关联级别。
9.如权利要求3所述的系统，其中该PMI子集包含多个推荐的PMI和多个限制的PMI，以及
其中所述关联级别为两个固定的关联级别。
10.如权利要求4所述的方法，其中根据从BS接收到的反馈轮询A-MAP信息元素(IE)的指示确定PMI的类型为推荐的PMI或限制的PMI。
11.如权利要求2所述的方法，其中所述关联级别为两个固定的关联级别。
12.如权利要求2所述的方法，进一步包括：在位图中广播与相邻的BS协调的至少一个或多个PMI的使用。
13.如权利要求3所述的系统，其中MS基于PMI与码本中的每一个剩余PMI之间的关联值，来确定来自于相邻的BS的用于干扰的PMI，以及确定与多个PMI的子集的尺寸相对应的关联级别，并且
反馈指示该关联级别的信息。
14.如权利要求3所述的系统，其中MS分别确定PMI码本中的每一个剩余PMI之间的关联值，并且
以递减次序对所述关联值排序。
15.如权利要求6所述的系统，其中MS基于从BS接收到的反馈轮询A-MAP信息元素(IE)来确定PMI的类型为推荐的PMI或限制的PMI。
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