CN102742173B - 具有多个协作的eNB的协同多点通信网络以及用于具有干扰抑制的波束成形协同的方法 - Google Patents
具有多个协作的eNB的协同多点通信网络以及用于具有干扰抑制的波束成形协同的方法 Download PDFInfo
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Abstract
本申请总体上描述了被配置为在协同多点(CoMP)通信网络中作为服务的增强型节点B(eNB)进行操作的eNB和方法的实施例。服务eNB根据基于修改的CQI而选择的调制和编码方案(MCS),使用基于参考PMI所选择的预编码矩阵对向用户设备(UE)传输的信号进行预编码,以进行波束成形的传输。当操作在协同模式时,一个或多个协作的eNB被配置为在分配用于波束成形传输的资源块期间,使用协同PMI来抑制对于所述UE的干扰。
Description
优先权要求
本申请基于35USC119(e),要求享受2010年11月5日提交的美国临时专利申请序号No.61/410,740的优先权,其以引用方式将其全部内容并入本申请。
技术领域
实施例与无线通信有关。一些实施例涉及协同多点通信。一些实施例涉及3GPP高级LTE网络。一些实施例涉及WiMAX网络和根据IEEE802.16标准中的一种配置的网络。
背景技术
协同多点(CoMP)通信网络对来自多个天线或基站的信号进行协同和/或组合,以使移动用户在其对视频、照片和其它高带宽服务进行访问和共享时,无论这些移动用户是接近于其服务的小区的中心还是位于其外部边缘,都能够获得一致的性能和质量。CoMP网络的一个问题是:传统的信道质量反馈方案没有考虑通过协同能实现干扰减少。
因此,存在着对于CoMP网络以及用于波束成形协同的方法的一般需求,其考虑了由基站的协同所造成的干扰的减少。此外,通常还存在着对于适合于在CoMP网络中实现干扰抑制的信道质量反馈方案的需求。
附图说明
图1根据一些实施例,描绘了一种CoMP通信网络;
图2根据一些实施例,描绘了一种报告方案;以及
图3是根据一些实施例,用于具有干扰抑制的波束成形协同的过程。
具体实施方式
下面描述和附图充分描绘了特定的实施例,以使本领域技术人员能够实施它们。其它实施例可以结合结构的、逻辑的、电学的、过程的以及其它改变。一些实施例的一部分和特征可以被包括在、或者替代其它实施例的一部分和特征。权利要求中阐述的实施例涵盖了这些权利要求的所有可用等同物。
图1根据一些实施例,描绘了一种CoMP通信网络。CoMP通信网络100包括多个增强型节点B(eNB),其包括向用户设备(UE)104提供通信服务的服务eNB102、一个或多个协作的eNB106和一个或多个非协作的eNB110。在一些实施例中,CoMP网络100可以是配置用于正交频分多址(OFDMA)通信的无线接入网络。在一些实施例中,网络100可以被配置为根据用于演进的通用陆地无线接入(E-UTRA)的第三代合作伙伴计划(3GPP)技术规范中的一种(例如,3GPPLTE版本10或者后续版本,其称为高级LTE)来进行操作。
根据一些实施例,所述一个或多个协作的eNB106被配置为在从服务eNB102到UE104的波束成形的传输103期间,抑制对于UE104的干扰。在这些实施例中,服务eNB102可以从UE104接收参考信道质量指示(CQI)和一个或多个协同CQI。此外,UE104还可以接收与参考CQI相关联的参考预编码矩阵指示(PMI)和与每一个协同CQI相关联的协同PMI,其来自UE104。服务eNB102可以根据参考CQI和协同CQI来计算修改的CQI,并且使用基于参考PMI所选择的预编码矩阵对向UE104传输的信号进行预编码,以进行波束成形的传输103。可以根据所修改的CQI来选择用于波束成形的传输103的调制和编码方案(MCS)。当操作在协同模式时,一个或多个协作的eNB106被配置为在从服务eNB102向UE104的已调度的波束成形的传输103期间,使用所述协同PMI来抑制对于UE104的干扰。下面更详细地描述这些实施例。波束成形的传输可以根据多输入多输出(MIMO)通信技术或者单输入单输出(SISO)通信技术来配置。
在这些实施例中,对多个eNB进行波束成形的协同,使得来自协作的eNB106的干扰能被抑制。这种对于来自其它小区的干扰的抑制,允许服务eNB102使用与更高的吞吐量相关联的MCS,来进行去往UE104的波束成形的传输103。
在一些实施例中,当两个或更多个协作的eNB106被配置为抑制干扰时,服务eNB102可以从UE104接收两个或更多个协同CQI,连同相关联的两个或更多个PMI。当仅仅一个协作的eNB106被配置为抑制干扰时,服务eNB102可以从UE104接收一个协同CQI以及相关联的PMI。
根据一些实施例,参考CQI可以是UE104基于来自服务eNB102的直接信道信息来选择的,并且每一个协同CQI可以是UE104基于所述直接信道信息和针对协作的eNB106中的每一个eNB的干扰信道信息来选择的。基于所修改的CQI而选择的MCS被配置为:与单独基于所述参考CQI而选择的MCS相比,提供更高的数据速率或者吞吐量。
服务eNB102并不使用所述预编码矩阵来抑制干扰,但是服务eNB102考虑了由于协作的eNB106将会与服务eNB102一起向UE104进行并发发送而带来的较少干扰的事实。因此,可以使用与所述参考CQI指示的MCS相比,与更高的数据速率相关联的MCS。在这些实施例中,由于所选择的MCS考虑了对所述一个或多个协作的eNB106的干扰的抑制,因此更高的数据速率或者吞吐量是可能的。在这些实施例中,由于UE104可能只反馈与未协同的场景相对应的(例如,基于信号与干扰加噪声比(SINR))以及与具有服务eNB102(即,eNB1)及每一个单个的协作的eNB106(即,eNBj(SINRj),j=2...N,其中N是包括服务eNB102的协作的eNB的总数)的协同的场景相对应的CQI,因此与CQI报告的传输相关联的开销得以减少并且可能最小化。在这些实施例中,所报告的CQI集合可以包括N个报告,服务eNB102可以使用这些报告来针对一个或多个协作的eNB106的几乎任意组合来得到修改的CQI。在这些实施例中,可以基于以eNBk1、...、eNBkm的协同为基础的SINR的增加量来计算修改的CQI,其在下面提供:
在一些实施例中,服务eNB102被配置为通过回程网络的回程链路105来向协作的eNB106提供所述协同PMI。此外,服务eNB102还可以通过回程链路105向协作的eNB106提供资源块信息。该资源块信息可以指示:针对对于UE104的干扰抑制,协作的eNB106要使用的OFDMA帧中的特定资源块(RB)。例如,该资源块信息可以指示:针对对于UE104的干扰抑制,协作的eNB106要使用的OFDM符号和子载波的集合。服务eNB102可以作为向UE104进行数据传输的资源分配的一部分(即,作为波束成形的传输103的一部分),来分配这些资源(例如,所述OFDM符号和子载波的集合)。相应地,服务eNB102可以向协作的eNB106提供所述RB分配,使得协作的eNB106将能够在所分配的RB(即,该UE在其中进行了调度)之中抑制对于UE104的干扰。
在一些实施例中,当协作的eNB106操作在协同模式时,协作的eNB106被配置为:使用所述协同PMI,以便通过应用波束成形向量来将其在邻近小区中的波束成形的传输调整到其它UE114,从而抑制对于UE104的干扰,其中所述波束成形向量至少部分地与UE104以协同PMI的形式向服务eNB102报告的特征向量相正交(即,正交或者半正交)。在这些实施例中,协作的eNB106可能只需要在由服务eNB102所分配的指示的RB期间,调整它们的传输。
在一些实施例中,UE104确定所述参考CQI所使用的直接信道信息,是基于从参考信号或导频中得到的直接信道矩阵(H)和SINR,其中所述参考信号或导频是通过服务eNB102和UE104之间的直接信道从服务eNB102接收的。UE104确定与协作的eNB106中的每一个eNB相关联的协同CQI所使用的干扰信道信息包括:根据从协作的eNB106接收的参考信号或导频得到的干扰信道的干扰信道矩阵(G)。在这些实施例中,可以通过从服务eNB102接收的导频或者参考信号来得到所述参考CQI。基于直接信道矩阵(H)对参考CQI的计算假定了未协同的场景,而基于干扰信道矩阵(G)对协同CQI中的每一个的计算假定了干扰抑制模型。
在这些实施例中,可以用下面形式来表示UE104针对CQI计算所使用的信号模型:
在上面等式(1a)中,k1,...,km是参与波束成形协同的eNB的集合(其包括所述一个或多个协作的eNB106,但不包括服务eNB102),H是从服务eNB1到UE104(即,UE1)的信道矩阵,Gj是从协作的eNBj到UE1的干扰信道矩阵,是与正交的向量或者酉向量的集合,n是来自未参与协同的其它小区的加性噪声加干扰。从等式(1a)中可以看出,UE104假定每一个协作的eNBj106应用了与UE104以协同PMI的形式向服务eNB102报告的特征向量相正交的波束成形向量。根据所使用的接收机类型,UE104基于等式(1a)计算有效的后处理SINR,并将该SINR值编码到CQI。在这些实施例中,可以使用的接收机类型包括迫零(ZF)、最大比合并(MRC)以及最小均方误差(MMSE)类型的接收机。
此外,还可以将来自协作的eNB106的完美干扰抑制视为等式(1a)的特殊情况,其具有用下面形式所表示的信号模型:
在等式(1a)和(1b)中,n的值可以取决于协作的eNB106的集合k1,...,km。在UE104处,可能不知道与协作的eNB106(即,参与该波束成形协同的eNB)的集合k1,...,km有关的信息。在该情况下,UE104需要报告与能参与了波束成形协同的所有可能eNB组合相对应的多个CQI。N个协作的eNB的组合的数量等于2N-1,并且其随着N呈指数地增长。例如,在两个协作的eNB的情况下,UE104计算与以下场景相对应的四个CQI:(1)不具有协同;(2)eNB1+eNB2的协同;(3)eNB1+eNB3的协同;(4)eNB1+eNB2+eNB3的协同。这种由UE1进行多个CQI的直接报告导致了:被反馈的2N-1个CQI的集合造成了很大的开销(对于N>2来说)。本申请公开的实施例使CQI报告的反馈最小化,这是由于UE104可以被配置为:如上所述的,只对与未协同的场景相对应的CQI(基于具有服务eNB102的SINR),以及与具有服务eNB1102及单一eNBj的协同的场景相对应的CQI(SINRj)进行反馈,其中j=2...N。结果,用于反馈的CQI的集合将会等于N。
在一些实施例中,CQI是UE104所经历的下行链路移动无线信道质量的指示,并且其与针对给定无线链路质量的最佳MCS相对应,使得造成的传输块差错率不会超过预先确定的比率(例如,10%)。在一些LTE实施例中,可以将十六种MCS组合作为可能的CQI值进行指定,作为CQI进行报告。PMI是针对给定的信道状况eNB所要使用的最佳预编码矩阵的指示。PMI可以指代码本(codebook)或者码本表,并且其可以允许网络来配置由PMI报告所表示的RB的数量。RI可以指示当使用空间复用时的有用的传输层的数量。在发送分集的情况下,秩可以等于1。
图2根据一些实施例,描绘了一种报告方案。该报告方案可以包括由UE104(图1)生成的向服务eNB102(图1)反馈的参考报告202。此外,该报告方案还可以包括由UE104生成的向服务eNB102反馈的针对每一个协作的eNB106(图1)的协同报告。参考报告202可以与服务eNB102(eNB1)相关联,协同报告206可以与第一协作eNB(eNB2)相关联,并且协同报告208可以与第二协作eNB(eNB3)相关联。
根据一些实施例,参考CQI、参考PMI和参考秩指示(RI)可以被包括在参考报告202中。协同CQI、协同PMI和协同RI可以被包括在针对每一个协作的eNB的协同报告206和208中。例如,在LTE实施例中,对于秩为2的传输,将从秩为2的码本中选择PMI。
在一些实施例中,参考报告202和协同报告206及208可以是时分复用的(TDM),以便在去往服务eNB102的上行链路(UL)信道上传输,如图2所示。在LTE实施例中,上行链路信道可以是进行周期性传输的物理上行链路控制信道(PUCCH),或者上行链路信道可以是进行非周期性传输的物理上行链路共享信道(PUSCH),但这些实施例的保护范围在该方面并不受限。
在其它实施例中,参考报告202和协同报告206及208可以是频分复用的(FDM),并且在上行链路信道的同一UL帧中(即,在不同的子载波集合上)发送,但这些实施例的保护范围在该方面并不受限,因为还可以使用其它反馈配置。
在一些实施例中,UE104可以将参考报告202和协同报告206及208联合编码到单一报告中,以便在去往服务eNB102的上行链路(UL)信道上传输。此外,相对于参考CQI,UE104还可以对所述一个或多个协同CQI进行有区别的编码。可以在协同报告206和208中提供进行了有区别的编码的CQI,从而减少用于CQI反馈的开销。
在一些实施例中,协同报告206、208的周期性可以与参考报告的周期性不同。在图2所示的示例性实施例中,示出了对于每一个协同报告206或208有三个参考报告202。例如,当与非协同模式相比更不频繁地使用协同模式时,可以使用减少的周期性的协同报告206、208。
参考报告202中包括的参考PMI可以是建议的PMI,以便由服务eNB102通过去往UE104的直接信道发送波束成形的传输103时使用。参考报告202中包括的参考RI可以指示用于服务eNB102的优选传输秩,以便由服务eNB102通过去往UE104的直接信道发送波束成形的传输103时使用。协同报告206中包括的每一个协同PMI可以由协作的eNB106使用,以便当操作在协同模式时,在波束成形的传输103期间,进行对于UE104的干扰抑制。在一些实施例中,参考报告202和协同报告206及208可以是CQI/PMI/RI报告,并且可以根据3GPPLTE标准中的一种来配置。
在联合传输模式实施例中,协作的eNB106可以向UE104联合地发送波束成形的信号。在这些实施例中,服务eNB102可以被配置为向协作的eNB106提供修改的CQI或者所选择的MCS,并且提供所述协同PMI(以及用于传输的数据)。此外,服务eNB102还可以向协作的eNB106提供RB信息。协作的eNB106可以(使用这些协同PMI)进行预编码,并且在所指示的RB期间对波束成形的信号进行联合发送,从而实现UE104的分集接收。在这些实施例中,每一个协作的eNB106可以根据所选择的MCS,通过并发的波束成形的传输来同时地和同步地发送相同的信息,从而使信号强度和信号质量最大化。在这些实施例中,协作的eNB106可以使用OFDMA帧的相同RB来进行联合传输。在这些实施例中,可以通过回程链路105(图1)向协作的eNB106提供该RB信息,以指示要在联合传输中使用的RB,以使协作的eNB106对传输进行协同。
在这些联合传输模式实施例中,被包括在协同报告206中的协同PMI由协作的eNB106使用,以便当操作在联合传输模式时,对去往UE104的联合传输进行预编码。被包括在协同报告206中的协同RI指示用于协作的eNB106的优选传输秩,以便当操作在联合传输模式时,对去往UE104的联合传输进行预编码。当操作在协同模式和联合传输模式时,服务eNB102可以通过回程链路105来向协作的eNB106提供所述协同PMI。此外,当操作在联合传输模式时,服务eNB102可以通过回程链路105来向协作的eNB106提供所选择的MCS。
图3是根据一些实施例,用于具有干扰抑制的波束成形协同的过程。当操作在协同模式时,过程300可以由CoMP网络(例如,网络100(图1))的eNB执行。操作302到310可以由服务eNB(例如,服务eNB102(图1))执行,并且操作312可以由一个或多个协作的eNB(例如,协作的eNB106(图1))执行。
操作302包括:从UE接收参考CQI和一个或多个协同CQI。所述参考CQI可以是所述UE基于来自服务eNB的直接信道信息而选择的。每一个协同CQI可以是所述UE基于所述直接信道信息和针对所述协作的eNB中的每一个eNB的干扰信道信息来选择的。
操作304包括:从所述UE接收与所述参考CQI相关联的参考PMI和与每一个协同CQI相关联的协同PMI。服务eNB可以通过回程链路向协作的eNB提供所述协同PMI。此外,服务eNB还可以通过回程链路向协作的eNB提供资源块信息。该资源块信息可以指示要由协作的eNB使用的OFDMA帧中的RB,以在下面的操作312中实现对于所述UE的干扰抑制。
操作306包括:根据所述参考CQI和所述协同CQI计算修改的CQI。
操作308包括:基于所修改的CQI来选择MCS,并且基于所述参考PMI来选择预编码矩阵。与单独基于所述参考CQI而选择的MCS相比,基于所修改的CQI而选择的MCS可以提供更高的数据速率或者吞吐量。
操作310包括:根据所选择的MCS,使用所选择的预编码矩阵对向所述UE传输的信号进行预编码,以进行波束成形的传输。
操作312包括:所述一个或多个协作的eNB在所分配的RB期间,使用所述协同PMI来抑制对于所述UE的干扰。在一些实施例中,所述协作的eNB使用所述协同PMI,以便通过应用波束成形向量来将其在邻近小区中的波束成形的传输调整到其它UE,从而抑制对于所述UE的干扰,其中所述波束成形向量至少部分地与所述UE以所述协同PMI形式向服务eNB报告的特征向量正交。
可以通过硬件、固件和软件中的一个或者组合的方式来实现实施例。此外,还可以将实施例实现成在计算机可读存储设备上存储的指令,该指令可以由至少一个处理器读取和执行,以实现本申请所描述的操作。计算机可读存储设备可以包括用于存储具有机器(例如,计算机)能读取的形式的信息的非临时性机构。例如,计算机可读存储设备可以包括只读存储器(ROM)、随机存取存储器(RAM)、磁盘存储介质、光存储介质、闪存设备以及其它存储设备和介质。在一些实施例中,eNB102和106以及UE104可以包括一个或多个处理器,并可以配置有存储在计算机可读存储设备上的指令,以执行本申请所描述的操作。
提供摘要是为了符合37C.F.R.的1.72(b)节,37C.F.R.的1.72(b)节要求提供摘要以使得读者能够确定该技术公开的本质和要点。应该理解为其并不用于限制或解释权利要求的范围或含义。因此,应将下面的权利要求结合到具体实施方式中,每项权利要求本身都代表一个单独的实施例。
Claims (19)
1.一种演进型节点B(eNB),其配置为在协同多点(CoMP)通信网络中作为服务eNB进行操作,所述服务eNB被配置为:
从用户设备(UE)接收参考信道质量指示(CQI)和一个或多个协同CQI;
从所述UE接收与所述参考CQI相关联的参考预编码矩阵指示(PMI)和与每一个协同CQI相关联的协同PMI,其中,所述参考CQI是所述UE基于来自所述服务eNB的直接信道信息而选择的,并且所述一个或多个协同CQI是所述UE基于所述直接信道信息和针对协作eNB中每一个eNB的干扰信道信息而选择的;
根据所述参考CQI和所述协同CQI计算修改的CQI;
向一个或多个协作的eNB提供所述协同PMI以用于干扰抑制;
根据基于所述修改的CQI而选择的调制和编码方案(MCS),使用基于所述参考PMI所选择的预编码矩阵对向所述UE传输的信号进行预编码,以进行波束成形的传输。
2.根据权利要求1所述的eNB,
其中,基于所述修改的CQI而选择的所述MCS被配置为:与单独基于所述参考CQI而选择的MCS相比,提供更高的数据速率,
其中,当操作在协同模式时,所述协作的eNB被配置为:在从所述服务eNB向所述UE的所述波束成形的传输期间,使用所述协同PMI来抑制对于所述UE的干扰。
3.根据权利要求2所述的eNB,其中,所述服务eNB被配置为:
通过回程链路向所述协作的eNB提供所述协同PMI,
通过所述回程链路向所述协作的eNB提供资源块信息,所述资源块信息指示:针对对于所述UE的干扰抑制,所述协作的eNB要使用的OFDMA帧中的资源块(RB)。
4.根据权利要求2所述的eNB,其中,当所述协作的eNB操作在协同模式时,所述协作的eNB被配置为:使用所述协同PMI,以便通过应用波束成形向量来将其在邻近小区中的波束成形的传输调整到其它UE,从而抑制对于所述UE的干扰,其中所述波束成形向量至少部分地与所述UE以所述协同PMI的形式向所述服务eNB报告的特征向量相正交。
5.根据权利要求2所述的eNB,其中,所述UE确定所述参考CQI所使用的所述直接信道信息是基于根据参考信号或导频得到的直接信道矩阵(H)和信号与噪声加干扰比(SINR),其中所述参考信号或导频是通过所述服务eNB和所述UE之间的直接信道从所述服务eNB接收的,
所述UE确定与所述协作的eNB中的每一个eNB相关联的协同CQI所使用的所述干扰信道信息包括:根据从所述协作的eNB接收的参考信号或导频得到的干扰信道的干扰信道矩阵(G)。
6.根据权利要求1所述的eNB,其中,所述参考CQI、参考预编码矩阵指示(PMI)和参考秩指示(RI)被包括在向所述服务eNB反馈的参考报告中,
其中,所述协同CQI、所述协同PMI和协同RI被包括在由所述UE向所述服务eNB反馈的针对每一个协作的eNB的协同报告中。
7.根据权利要求6所述的eNB,其中,所述参考报告和所述协同报告是时分复用的(TDM),以便在去往所述服务eNB的上行链路(UL)信道上传输,
其中,与所述参考报告的周期性相比,所述协同报告的周期性更小。
8.根据权利要求6所述的eNB,其中,所述UE将所述参考报告和所述协同报告联合编码到单一报告中,以便在去往所述服务eNB的上行链路(UL)信道上传输。
9.根据权利要求6所述的eNB,其中,所述UE被配置为:相对于所述参考CQI,对所述协同CQI进行有区分的编码,
其中,在所述协同报告中提供进行了有区分的编码的CQI。
10.根据权利要求6所述的eNB,其中,所述参考报告中包括的所述参考PMI是建议的PMI,以便由所述服务eNB通过去往所述UE的所述直接信道发送所述波束成形的传输时使用,
其中,所述参考报告中包括的所述参考RI指示所述服务eNB的优选传输秩,以便由所述服务eNB通过去往所述UE的所述直接信道发送所述波束成形的传输时使用,
其中,协同报告中包括的每一个协同PMI由协作的eNB使用,以便当操作在协同模式时,在所述波束成形的传输期间,进行对于所述UE的干扰抑制。
11.根据权利要求1所述的eNB,其中,当所述协作的eNB操作在联合传输模式时:
所述服务eNB被配置为向所述协作的eNB提供所述修改的CQI或者所选择的MCS和所述协同PMI,以及用于传输的数据;
所述协作的eNB被配置为对波束成形的信号进行预编码和联合发送,从而实现所述UE的分集接收。
12.一种用于具有干扰抑制的波束成形协同的方法,其中服务的演进型节点B(eNB)向一个或多个协作的eNB发送协同预编码矩阵指示(PMI)和秩指示(RI),所述协同PMI和RI分别提供与干扰信道和优选的传输秩有关的信息,
其中,所述方法包括:
所述协作的eNB基于所述协同PMI和所述RI来配置其传输,以便在服务eNB进行波束成形的传输期间,抑制对于用户设备(UE)的干扰;
所述服务eNB基于修改的信道质量指示(CQI)索引来配置向所述UE的所述波束成形的传输,其中所述修改的CQI索引考虑了所抑制的干扰;
其中,所述服务eNB从所述UE接收参考信道质量指示以及一个或多个协同信道质量指示,所述参考信道质量指示是所述UE基于来自所述服务eNB的直接信道信息而选择的,并且所述一个或多个协同CQI是所述UE基于所述直接信道信息和针对协作eNB中每一个eNB的干扰信道信息而选择的;
从所述UE接收与所述参考CQI相关联的参考PMI和与每一个协同CQI相关联的协同PMI;
根据所述参考CQI和所述协同CQI计算所述修改的CQI;
根据基于所述修改的CQI而选择的调制和编码方案(MCS),使用基于所述参考PMI所选择的预编码矩阵对向所述UE传输的信号进行预编码,以进行所述波束成形的传输。
13.根据权利要求12所述的方法,
其中,基于所述修改的CQI而选择的所述MCS被配置为:与单独基于所述参考CQI而选择的MCS相比,提供更高的数据速率。
14.根据权利要求13所述的方法,其中,所述UE确定所述参考CQI所使用的所述直接信道信息是基于根据参考信号或导频得到的信道矩阵(H)和信号与噪声加干扰比(SINR),其中所述参考信号或导频是通过所述服务eNB和所述UE之间的直接信道从所述服务eNB接收的,
其中,所述UE确定与所述协作的eNB中的每一个eNB相关联的协同CQI所使用的所述干扰信道信息包括:根据从所述协作的eNB接收的参考信号或导频得到的干扰信道的干扰信道矩阵(G)。
15.根据权利要求12所述的方法,其中,所述参考CQI、参考预编码矩阵指示(PMI)和参考秩指示(RI)被包括在向所述服务eNB反馈的参考报告中,
其中,所述协同CQI、所述协同PMI和协同RI被包括在由所述UE向所述服务eNB反馈的针对每一个协作的eNB的协同报告中。
16.一种用于在协同多点(CoMP)通信网络中将演进型节点B(eNB)作为服务eNB进行操作的方法,所述方法包括:
从用户设备(UE)接收参考信道质量指示(CQI)和一个或多个协同CQI;
从所述UE接收与所述参考CQI相关联的参考预编码矩阵指示(PMI)和与每一个协同CQI相关联的协同PMI,其中,所述参考CQI是所述UE基于来自所述服务eNB的直接信道信息而选择的,一个或多个协同CQI是所述UE基于所述直接信道信息和针对协作eNB中每一个eNB的干扰信道信息而选择的;
根据所述参考CQI和所述协同CQI计算修改的CQI;
向一个或多个协作的eNB提供所述协同PMI以用于干扰抑制;
根据基于所述修改的CQI而选择的调制和编码方案(MCS),使用基于所述参考PMI所选择的预编码矩阵对向所述UE传输的信号进行预编码,以进行波束成形的传输。
17.根据权利要求16所述的方法,
其中,所述方法包括:所述服务eNB基于所述修改的CQI选择的所述MCS被配置为:与单独基于所述参考CQI而选择的MCS相比,提供更高的数据速率,
其中,当操作在协同模式时,所述协作的eNB被配置为:在从所述服务eNB向所述UE的所述波束成形的传输期间,使用所述协同PMI来抑制对于所述UE的干扰。
18.根据权利要求17所述的方法,还包括:
所述服务eNB向所述协作的eNB提供资源块信息,所述资源块信息指示:针对对于所述UE的干扰抑制,所述协作的eNB要使用的OFDMA帧中的资源块(RB)。
19.根据权利要求17所述的方法,其中,所述UE确定所述参考CQI所使用的所述直接信道信息是基于根据参考信号或导频得到的直接信道矩阵(H)和信号与噪声加干扰比(SINR),其中所述参考信号或导频是通过所述服务eNB和所述UE之间的直接信道从所述服务eNB接收的,
其中,所述UE确定与所述协作的eNB中的每一个eNB相关联的协同CQI所使用的所述干扰信道信息包括:根据从所述协作的eNB接收的参考信号或导频得到的干扰信道的干扰信道矩阵(G)。
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WO2010124725A1 (en) * | 2009-04-28 | 2010-11-04 | Telefonaktiebolaget Lm Ericsson (Publ) | Transmission parameter adaptation in cooperative signal communication |
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