CN103999385A - 节点间干扰消除 - Google Patents

节点间干扰消除 Download PDF

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Publication number
CN103999385A
CN103999385A CN201280059134.XA CN201280059134A CN103999385A CN 103999385 A CN103999385 A CN 103999385A CN 201280059134 A CN201280059134 A CN 201280059134A CN 103999385 A CN103999385 A CN 103999385A
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node
signal
downlink
uplink signal
interference
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A.霍尔耶夫
A.彻尔夫亚科夫
M.施洛夫
S.潘特利夫
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Intel Corp
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Intel Corp
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Abstract

公开了一种用于在受害者节点处消除节点间干扰的方法,所述方法可以被作为指令在机器上被执行,其中所述指令被包括在至少一个计算机可读介质上。所述方法可以包括受害者节点从侵略者节点接收下行链路信号信息。所述受害者节点可以使用下行链路信号信息估计针对侵略者节点和受害者节点之间的信道的信道脉冲响应。所述受害者节点可以使用下行链路信号信息和信道脉冲响应估计针对所述信道的节点间干扰信号。所述受害者节点可以从无线设备接收上行链路信号,其中下行链路信号信息在接收上行链路信号之前被接收。所述受害者节点可以从上行链路信号中除去所估计的节点间干扰信号,以形成节点间干扰补偿的上行链路信号,从而在上行链路信号中基本上消除来自侵略者节点的节点间干扰。

Description

节点间干扰消除
相关申请
本申请主张2011年9月30日提交的案卷号为P39951Z、序列号为61/542,086 的美国临时专利申请的利益,并据此通过引用并入。
背景技术
无线移动通信技术使用各种标准和协议来在发射站和无线移动设备之间传送数据。一些无线移动设备在下行链路(DL)传输中使用正交频分复用(OFDM)并在上行链路(UL)传输中使用单载波频分多址(SC-FDMA)进行通信。使用OFDM的标准和协议包括:第三代合作伙伴计划(3GPP)长期演进(LTE)、被行业团体通称为WiMAX(微波接入全球互通)的电气和电子工程师协会(IEEE)802.16标准(例如,802.16e, 802.16m)、以及被行业团体通称为WiFi的IEEE802.11标准。
在3GPP无线电接入网络(RAN)LTE系统中,发射站可以是演进通用陆地无线电接入网络(E-UTRAN)节点 B(也通常表示为:演进节点 B、增强节点B,e节点B(eNodeB),或eNB)与无线电网络控制器(RNC)的组合,该发射站与被称为用户设备(UE)的无线移动设备通信。下行链路传输可以是从发射站(或eNodeB)到无线移动设备(或UE)的通信,以及上行链路传输可以是从无线移动设备到发射站的通信。
发射站和无线移动设备可以经由时分双工(TDD)或频分双工(FDD)进行通信。TDD是在时域中分离下行链路和上行链路信号的时分复用(TDM)的应用。在TDD中,下行链路信号和上行链路信号可以在相同的载波频率上被承载,其中下行链路信号使用与上行链路信号不同的时间间隔,因此下行链路信号和上行链路信号不产生针对彼此的干扰。在FDD中,发射器和接收器使用不同的载波频率进行操作。在FDD中,因为下行链路信号使用与上行链路信号不同的载波频率,所以下行链路和上行链路信号之间的干扰被避免。在LTE中,帧结构类型2可以被用于TDD,并且帧结构类型1可以被应用于全双工和半双工FDD二者。
多个发射站可以彼此接近地相对靠近,以便向移动设备提供完全无线覆盖。小区间干扰协调(ICIC)或增强ICIC(eICIC)可以被用于资源协调,用以减少发射站(或节点)之间的干扰。在时间上的任何时刻,干扰节点(或侵略者节点或发射节点)可以生成针对受害者节点(或接收节点)或受害者移动设备(或接收设备)的干扰。
附图说明
本公开的特征和优点从接下来结合了附图的详细说明来看将是显然的,附图一起例如图示了本公开的特征;并且,其中:
图1图示了依据示例的发射下行链路信号的侵略者节点、发射上行链路信号的无线设备和受害者节点的框图;
图2图示了依据示例的异构网络(HetNet)中的发射下行链路信号的下行链路节点、发射上行链路信号的无线设备和上行链路节点的框图;
图3图示了依据示例的节点间干扰消除的流程图;
图4图示了依据示例的集中无线电接入网络(C-RAN)的基带单元(BBU)和远程无线电单元(RRU)配置的框图;
图5描绘了依据示例的用于在受害者节点处消除节点间干扰的方法的流程图;
图6描绘了依据示例的用于在中央处理模块(CPM)处消除节点间干扰的方法的流程图;
图7图示了依据示例的节点间干扰消除设备的框图;
图8图示了依据示例的用于消除节点间干扰的中央处理模块(CPM)的框图;以及
图9图示了依据示例的移动设备的示图。
现在参考所图示的示例性实施例,并且特定的语言在此将被用于描述相同的实施例。然而,将被理解的是:不由此意图限制本发明的范围。
具体实施方式
在公开和描述本发明之前,将被理解的是:这个发明不限于在此公开的特定结构、过程步骤、或材料,而是延伸到会由相关领域的技术人员认识到的其等价物。还应理解的是:在此所使用的术语仅被用于描述特定实施例的目的,并且不意图是限制性的。不同图中的相同附图标记表示相同的元素。在流程图和过程中提供的数字为了图示步骤和操作的清楚而被提供,并且不必需指示特定顺序或序列。
示例性实施例
下面提供技术实施例的初始概述,并且然后特定的技术实施例稍后被进一步详细地描述。这个初始的概要旨在帮助读者更快地理解技术,而不是意图等同所述技术的关键特征或必要特征,也不意图限制要求保护的主题的范围。
宽带时分双工(TDD)系统用于移动设备遍及世界的无线通信。LTE/WiMax宽带接入技术中的芯片组操作可以支持相同芯片上的频分双工(FDD)和TDD双工模式二者。TDD系统相对于FDD系统可以具有某些优点。例如,在TDD中,信道互易性可以在物理层被有效地使用以优化网络性能。TDD系统相对于FDD系统还可以具有针对业务状况的灵活性的高潜力。在LTE中,TDD网络的效率可以通过排除eNodeB到eNodeB的小区间干扰并使TDD网络适应于动态业务状况而被相当大地改进。
在实际网络中,业务在时域或小区域中可能不对称。下行链路(DL)和上行链路(UL)业务的量可以显著地不同,并可以随时间或横跨不同的小区或节点而变化。TDD系统具有通过适应分配到DL和UL的时间资源的量(例如,不同TDD帧配置)而有效地处理这种业务变化的可能性。然而,与横跨多小区环境的对齐DL和UL配置或非自适应系统相比,多小区环境中的这种适应可以导致不同类型的小区间干扰的出现。
图1图示了针对同构网络部署情况的用户或移动设备250和252之间的用户间干扰284(例如,UE到UE的干扰)以及发射站210和212之间的节点间干扰280(包括小区间干扰)(例如,eNodeB到eNodeB的干扰)的示例。如果未得到解决,则不同类型的干扰(包括小区间干扰和用户间干扰)就可能限制使TDD系统适应于动态业务状况的潜在益处。由于发射站的相对高的发射功率,小区间的干扰(例如,发射站到发射站的干扰或eNodeB到eNodeB的干扰)就可能是严重的问题。例如,节点(例如,宏节点)之间的传播特性可以是视距(LOS)的,其发射功率比用户终端或移动设备的功率近似高25-30分贝(dB)。分贝(dB)是指示物理量(通常为功率或密度)相对于指定或默示参考水平之比的对数单位。因此,从移动设备250接收的上行链路信号272的功率水平可能比来自侵略者节点的节点间干扰信号270的功率低。在整个网络上使用相同同步TDD配置的同步TDD网络已被用于避免节点间的干扰。
考虑到横跨具有TDD网络的较高效率和减少的干扰的多小区环境的非对称DL和UL配置,节点间干扰可以在接收节点(例如,受害者节点或上行链路节点)被补偿或消除。发射站(例如,节点)在指定时间间隔可以是基于节点的DL或UL配置的受害者节点或侵略者节点二者。例如,如果在一个时间间隔节点210正在从移动设备250接收上行链路(UL)传输而另一个节点212正在发射下行链路(DL)传输,则该节点可以被称为受害者节点或上行链路节点。如果在另一个时间间隔该节点212正在向移动设备252发射DL传输而另一个节点210正在接收UL传输,则该节点可以被称为侵略者节点或下行链路节点。
在示例中,受害者节点210可以经由回程通信链路244(诸如,经由线缆连接或光纤连接的X2信令)从侵略者节点212接收DL信号信息。在受害者节点处,针对侵略者节点和受害者节点之间信道的信道脉冲响应280可以被使用下行链路信号信息估计。针对信道的节点间干扰信号可以被使用下行链路信号信息和信道脉冲响应估计。在侵略者节点的下行链路信号信息被接收并且节点间干扰信号被估计之后,受害者节点可以从无线设备250接收上行链路信号260。所估计的节点间干扰信号可以被从上行链路信号中除去,以形成节点间干扰补偿的上行链路信号,这可以在上行链路信号中基本上消除来自侵略者节点的节点间干扰,因此允许在受害者节点和无线设备之间有可靠的、高吞吐量的传输。
尽管图1图示了同构网络,但在此描述的方法、系统、设备和干扰还可以适用于异构网络。在同构网络中,发射站(也可以被称为宏节点)可以向小区中的移动设备提供基本无线覆盖。异构网络(HetNet)被用于处理:由于移动设备增加的使用和功能引起的宏节点上的增加的业务载荷。HetNet可以包括:采用可以在宏节点的覆盖区域内以欠佳规划的或甚至完全未协调的方式部署的低功率节点(微eNB、微微eNB、毫微微eNB、或家庭eNB [HeNB])的层覆盖的有规划的高功率宏节点(或宏eNB)的层。宏节点可以被用于基本覆盖,以及低功率节点可以被用于填充覆盖的孔隙,以提升宏节点覆盖区域之间的边界处或热区(hot-zone)中的容量,并改进建筑结构阻止信号传输的室内覆盖。
在另一个示例中(诸如,在集中无线电接入网络(C-RAN)或HetNet中),节点间干扰消除可以由中央处理模块(CPM)提供。在示例中,CPM可以被用作网络的多个站的基带单元(BBU)。图2图示了经由回程通信链路242(诸如,经由线缆连接或光纤连接的X2信令(或其他厂商特定连接和协议))与宏节点214和低功率节点(LPN)230和232通信的CPM 240。CPM可以为下行链路节点214生成下行链路信号。CPM可以使用由下行链路节点发射的下行链路信号估计针对下行链路节点和上行链路节点230之间的信道的信道脉冲响应290。CPM可以使用下行链路信号和信道脉冲响应确定针对信道的节点间干扰信号。下行链路信号274可以经由下行链路节点发射。CPM可以在与下行链路信号被发射基本相同的时间经由上行链路节点从无线设备接收上行链路信号264。所接收的节点间干扰信号可以被从所述上行链路信号中除去,以形成节点间干扰补偿的上行链路信号,从而在上行链路信号中基本上消除来自下行链路节点的节点间干扰。
节点间干扰消除可以为节点或小区间的动态非对齐的DL/UL帧结构提供消除、减少或可能甚至排除TDD网络中的节点间干扰的机制。另外,节点间干扰消除可以被用于提供TDD和FDD网络的共存。
接下来提供所述示例的附加细节。TDD网络中的节点间干扰(包括LTE系统的eNodeB到eNodeB节点间干扰)消除可以基于DL信号信息的交换,包括相邻节点(例如,相邻发射站)之间的DL信号波形或其参数,并且利用DL信号信息来消除由节点接收的有用UL信号上的干扰。当DL和UL业务非对称性通过在不同小区中(例如,在不同的节点处)实现异步DL/UL帧结构的高效使用而存在时,节点间的干扰消除可以提高TDD网络的性能。节点间干扰消除可以利用回程链路容量的提升和依赖于分布式天线系统或远程无线电头端(RRH)(其可以通过光纤线缆与集中处理单元或模块(诸如,C-RAN中的BBU)直接连接)的部署的网络体系结构。所描述的方法、设备和系统可以采用在每个小区中动态分配DL和UL资源而在TDD网络中提供简单且有效的小区间干扰消除。
有线线路网络基础结构(诸如,高吞吐量光纤连接)已转换和改进了宽带蜂窝系统体系结构。有线线路网络基础结构促进了HetNet基础结构中的通信,其中网络的服务站可以彼此合作以更好地服务用户需求。例如,宏节点214可以与在宏节点覆盖内部署的或与其他相邻宏节点部署在一起的数个LPN 230和232合作。网络之间的实时合作由于连接服务站的回程链路的高容量而成为可行。使用C-RAN中的远程无线电头端和分布式天线系统可以利用地理上分布式的数据传输的好处,并且因此提高网络频谱的效率。每个远程无线电头端可以被认为是不同的小区(如果在宏小区内被分配了不同物理小区ID),或被认为是相同宏小区的远程天线。回程通信链路和C-RAN体系结构的改进考虑到支持可用DL和UL资源的比例的动态重新配置的TDD网络的部署,并且因此通过适用于DL和UL方向上的瞬间业务状况而提高TDD网络的效率。
向回参考在指定的时间间隔在动态TDD模式中操作的同构网络部署的图1,受害者节点小区区域216中的受害者节点210可以接近于侵略者节点小区区域218中的侵略者节点212。可以为在UL(受害者小区)中操作的受害者节点和在DL(侵略者小区)中操作的侵略者节点提供节点间干扰消除。由受害者节点接收的上行链路信号260可以被表示为:                                                ,其中是由受害者小区移动设备(即,无线设备)250发射到受害者节点的上行链路信号,是由侵略者节点发射到侵略者小区移动设备(即,第二无线设备)252的下行链路信号,是来自其他源的加性噪声,282是受害者小区移动设备和受害者节点之间的信道脉冲响应,是侵略者节点和受害者节点之间的信道脉冲响应。图1还图示了由侵略者小区移动设备接收的下行链路信号262,包括具有侵略者小区移动设备和侵略者节点之间的信道脉冲响应286的下行链路信号,以及充当与受害者小区移动设备和侵略者小区移动设备之间的信道脉冲响应284的干扰的上行链路信号。
在没有干扰的情形下,所接收的上行链路信号可以被表示为,受害者小区移动设备和受害者节点之间的信道脉冲响应与由受害者小区移动设备发射的上行链路信号的线性卷积。移除来自相邻节点(例如,侵略者节点)的节点间干扰信号的附加项允许受害者节点在一些情形下成功接收上行链路信号。由侵略者节点生成的干扰信号的功率可以比有用的上行链路信号的功率高得多。
干扰节点(即,侵略者节点)212可以通过回程链路244把所发射信号270上的下行链路信号信息提供到接收节点(即,受害者节点)210。干扰节点和接收节点二者可以从彼此接收下行链路信号信息,因为两个节点可以在不同的时间间隔提供下行链路传输。下行链路信号信息交换可以采用不同的方式实现。在一个实施例中,下行链路信号信息可以包括直接波形。在另一个实施例中,下行链路信号信息可以包括用于在受害者节点重建所传送的波形的特定信息。这种特定信息可以包括信息位、资源配置、多输入多输出(MIMO)发射模式、调制和代码率、以及这个特定信息的组合。由侵略者节点发射的信号在受害者节点处可以变得完全或部分已知和可用。
一旦所传送的小区间干扰波形在受害者节点210处可用,则受害者节点可以使用小区间干扰波形来估计信道脉冲响应,或受害者节点和侵略者节点之间的信道传递函数。由于有来自所传送的波形的知识的大的处理增益,信道脉冲响应的信道估计准确度能够非常高。可替代地,信道估计可以采用由该系统中的参考信号(RS)或同步信号提供的附加信息来执行,或信道估计可以在信道估计之前被测量时由网络提供。
受害者节点210可以估计或重建所接收的小区间干扰信号,并从所接收的信号中除去小区间干扰信号,因此抑制小区间干扰。当小区间干扰信道估计能够被准确估计时,受害者节点处的节点间干扰补偿的上行链路信号可以被表示为:,其可以在上行链路信号中基本上消除来自侵略者节点的节点间干扰。
因此,节点间干扰消除可以移除大部分节点间干扰,其可以使上行链路信号的接收在相邻节点之间的非对称UL-DL配置中可行。节点间干扰消除可以基于瞬间DL和UL业务非对称性向TDD网络提供附加的选项来动态控制该网络的每个小区中的TDD配置。
图3图示了示例方法,用以在具有动态TDD配置的网络中消除、减少或排除来自侵略者节点的节点间干扰。TDD网络的每个小区或节点可以调节节点的TDD配置来更好适合DL和UL业务状况,或每个节点可以针对业务状况110提供TDD配置的适应。受害者小区或受害者节点可以在UL中操作,以及侵略者小区或侵略者节点可以把DL信号传送到侵略者小区用户或移动设备、或侵略者节点,以及受害者小区移动设备可以提供信号传输120。侵略者小区或侵略者节点可以把足以恢复由侵略者小区或侵略者节点发射的信号的下行链路信号信息提供到受害者小区或受害者节点,或者节点可以提供下行链路信号信息的信息交换130。受害者小区或受害者节点可以重建由侵略者小区或侵略者节点传送的DL波形,或者受害者节点可以提供下行链路信号的波形重建140。受害者小区或受害者节点可以使用重建的DL波形估计来自侵略者小区的信道,或者受害者节点可以提供节点间干扰信道估计150。受害者小区或受害者节点可以使用重建的波形和信道估计来创建节点间干扰信号的副本,并从所接收的信号除去所述副本,或受害者节点可以提供节点间干扰消除160。受害者小区或受害者节点可以执行处理来解码上行链路信号,或受害者节点可以提供上行链路信号解码170。
节点间干扰消除可以被用于HetNet或集中、合作或云无线电接入网络(C-RAN),其中发射站(或节点)功能可以在基带单元(BBU)处理池和远程无线电单元(RRU)或远程无线电头端(RRH)之间被细分,光纤把BBU连接到RRU。C-RAN可以提供集中处理、合作无线电、和实时云基础结构RAN。
如图4中所示的,C-RAN可以包括三个部分:由具有天线的远程无线电单元(RRU)432A-I装备的远程无线电的池430,包括基带单元(BBU)412A-C的共享虚拟基站或基带处理池410,以及把远程无线电的池中的至少一个RRU连接到基带库中的至少一个BBU的物理传输网络420中的光纤或电缆422A-D和424G。所述基带处理池可以被集中。每个BBU可以包括:高性能通用处理器、实时虚拟处理器、和/或物理(PHY)层处理器和/或MAC层处理器414A-F。BBU可以被经由电气或光学线缆426C耦合到载荷平衡器和交换机418A-B。物理传输网络可以是使用光纤或光学线缆的低等待时间的传输网络、带宽高效网络、和/或光学传输网络420。
在另一个示例中,物理传输网络可以是高速电气传输网络。物理传输网络可以在BBU和RRU之间提供物理通信链路。物理通信链路可以包括:光纤链路或有线电链路。BBU可以被称为无线电元素控制器(REC)。RRU可以被称为远程无线电头端(RRH)、远程无线电设备(RRE)、中继站(RS)、或无线电设备(RE)。每个RRU可以被与BBU分离所选择的距离。每个RRU可以包括针对移动设备(诸如,用户设备(UE)434A-J)的扇区、小区、或覆盖区域438E,其中所述移动设备可以位于多个扇区、小区或覆盖区域内。C-RAN的分布式RRU可以把高容量和宽覆盖区域提供给RAN。
RRU 432A-I可以更小、更易于安装、更易于维持,并且比BBU 412A-C消耗更少的功率。基带处理池110可以通过实时虚拟化技术聚集BBU的处理功率,并且把信号处理能力提供到所述池中的虚拟BTS或RRU。物理传输网络可以把所处理的信号分布到远程无线电的池430中的RRU。集中的BBU池可以减小用于BBU的传送站室的数量,并且可以使资源聚合和大规模的合作无线电传送/接收成为可能。C-RAN可以把提供服务的网关(S-GW)连接性从BBU池中的第一BBU动态切换到第二BBU。在另一个示例中,C-RAN可以把BBU的连接性从RRU库中的第一RRU动态切换到第二RRU。
向回参考图2,在指定的时间间隔在动态TDD模式中操作的异构网络部署可以在HetNet和/或C-RAN中提供节点间干扰消除。节点间干扰消除可以应用到具有中央处理模块(CPM)或集中处理单元和远程无线电头端(或宏节点或LPN)的异构合作网络中的节点。当CPM被使用时,用于把下行链路信号信息发射到上行链路节点的回程链路可以不被需要,并且处理(诸如传送波形的构建、节点间信道估计、以及把节点间干扰信号从所接收的上行链路信号中除去),可以在CPM处直接实现,所述CPM还可以控制数个小区、节点或远程无线电头端(RRH)的操作。
图2图示了经由回程通信链路242(诸如经由线缆连接或光纤连接的X2信令)与宏节点214和低功率节点(LPN)230和232通信的CPM 240。CPM可以生成针对下行链路节点214的下行链路信号。CPM可以使用下行链路信号或下行链路信号信息估计下行链路节点和上行链路节点230之间的信道的信道脉冲响应290。CPM可以使用下行链路信号和信道脉冲响应确定信道的节点间干扰信号。下行链路信号274可以被经由下行链路节点传送。CPM可以在与下行链路信号被发射基本相同的时间经由上行链路节点从无线设备接收上行链路信号264。所接收的节点间干扰信号可以被从上行链路信号中除去,以形成节点间干扰补偿的上行链路信号,从而在上行链路信号中基本上消除来自下行链路节点的节点间干扰。
可以为在接近于在DL中操作的下行链路节点214的UL中操作的上行链路节点230或232提供节点间干扰消除。由上行链路节点230接收的上行链路信号264可以被表示为:,其中是由移动设备(即,无线设备)254发射到上行链路节点的上行链路信号,是由下行链路节点214发射到第二移动设备(即,第二无线设备)256的下行链路信号,是来自其他源的加性噪声,是移动设备和上行链路节点之间的信道脉冲响应,是下行链路节点和上行链路节点之间的信道脉冲响应。
图2还图示了由第二上行链路节点232接收的第二上行链路信号,其中是由第三移动设备258发射到第二上行链路节点的第二上行链路信号,是三移动设备和第二上行链路节点之间的信道脉冲响应,以及是下行链路节点和第二上行链路节点之间的信道脉冲响应。图2还图示了由第二移动设备接收的下行链路信号,包括具有第二移动设备和下行链路节点之间的信道脉冲响应的下行链路信号。
节点间干扰消除可以被与MIMO波束形成技术结合使用。例如,在侵略者节点或下行链路节点处发射波束形成可以在受害者节点或上行链路节点的方向上提供零陷(null steering),从而使在受害者节点或上行链路节点的方向上发射的信号传输功率最小化。受害者节点或上行链路节点侧的接收器(RX)波束形成以及干扰消除可以提供由侵略者节点或下行链路节点引起的初步小区间干扰补偿。
在另一个示例中,小区间干扰消除可以通过使用通过相邻节点之间的回程链路交换的参考干扰信号波形而被应用到不同小区中的异步DL和UL传输。小区间干扰消除可以包括从侵略者小区重建DL信号波形,和/或适应于TDD网络中的DL和UL业务非对称性。
另一个示例提供了用于在受害者节点处消除节点间干扰的方法500(如图5中的流程图所示的)。所述方法可以被作为指令在机器上执行,其中指令被包括在是至少一个计算机可读介质上。所述方法包括在受害者节点处从侵略者节点接收下行链路信号信息的操作(如在块510中)。接下来是使用下行链路信号信息估计针对侵略者节点和受害者节点之间的信道的信道脉冲响应的操作(如在块520中)。所述方法的下一个的操作可以是使用下行链路信号信息和信道脉冲响应估计针对所述信道的节点间干扰信号(如在块530中)。
所述方法可以进一步包括从无线设备接收上行链路信号,其中下行链路信号信息在接收上行链路信号之前被接收。接下来可以是如下操作:从上行链路信号中除去所估计的节点间干扰信号,以形成节点间干扰补偿的上行链路信号,从而在上行链路信号中基本上消除来自侵略者节点的节点间干扰。所述无线设备可以是移动设备、用户设备(UE)或移动站(MS)。
由受害者节点接收的上行链路信号可以被表示为:,其中是定义线性卷积的运算符,是由无线设备发射到受害者小区中的受害者节点的上行链路信号,是由侵略者节点发射到第二无线设备的下行链路信号,是加性噪声,是无线设备和受害者节点之间的信道脉冲响应,以及是侵略者节点和受害者节点之间的信道脉冲响应,其中节点间干扰信号被表示为:,并且节点间干扰补偿的上行链路信号被表示为:
该方法可以进一步包括针对由无线设备发射的上行链路信号信息解码节点间干扰补偿的上行链路信号。下行链路信号信息被经由X2信令或回程链路信令(经由线缆连接或光纤连接)接收。估计信道脉冲响应可以进一步包括从侵略者节点接收参考信号,并且使用所述参考信号估计所述信道脉冲响应。下行链路信号信息可以是直接信号波形,可以包括足以重建下行链路信号波形的控制和有效载荷信息,或可以包括用于重建下行链路波形的特定信息。受害者节点和侵略者节点可以包括演进节点 B(eNodeB)、基站(BS)、宏演进节点 B(宏eNB)、低功率节点(LPN)、微eNB、微微eNB、毫微微eNB、家庭eNB(HeNB)、远程无线电头端(RRH)、远程无线电设备(RRE)或远程无线电单元(RRU)。
另一个示例提供了用于在中央处理模块(CPM)处消除节点间干扰的方法600(如图6中的流程图所示)。所述方法可以被作为指令在机器上被执行,其中指令被包括在是至少一个计算机可读介质上。所述方法包括在CPM处为下行链路节点生成下行链路信号的操作(如在块610中)。接下来是使用下行链路信号估计针对下行链路节点和上行链路节点之间的信道的信道脉冲响应的操作(如在块620中)。所述方法的下一个的操作可以是使用下行链路信号和信道脉冲响应确定针对所述信道的节点间干扰信号(如在块630中)。
所述方法可以进一步包括经由下行链路节点发射下行链路信号。接下来可以是如下操作:在与下行链路信号被发射基本相同的时间在CPM处经由上行链路节点从无线设备接收上行链路信号。所述方法的接下来的操作可以是从上行链路信号中除去所接收的节点间干扰信号,以形成节点间干扰补偿的上行链路信号,从而在上行链路信号中基本上消除来自下行链路节点的节点间干扰。
由上行链路节点接收的上行链路信号被表示为:,其中是定义线性卷积的运算符,是由无线设备发射到上行链路节点的上行链路信号,是由下行链路节点发射到第二无线设备的下行链路信号,是加性噪声,是无线设备和上行链路节点之间的信道脉冲响应,以及是下行链路节点和上行链路节点之间的信道脉冲响应,其中节点间干扰信号被表示为:,并且节点间干扰补偿的上行链路信号被表示为:。所述方法可以进一步包括针对由无线设备发射的上行链路信号信息解码节点间干扰补偿的上行链路信号。下行链路信号被发射到下行链路节点,并且上行链路信号信息经由X2信令或回程链路信令(经由线缆连接或光纤连接)从上行链路节点被接收。所述方法可以进一步包括重新调度上行链路(UL)和下行链路(DL)帧或改变UL-DL配置以减小上行链路节点和下行链路节点之间的帧中的异步DL/UL子帧的数量。CPM可以包括演进节点B(eNodeB)、基站(BS)、宏演进节点 B(宏eNB)或基带单元(BBU)。下行链路节点和上行链路节点可以包括演进节点B(eNodeB)、基站(BS)、宏演进节点 B(宏eNB)、低功率节点(LPN)、微eNB、微微eNB、毫微微eNB、家庭eNB(HeNB)、远程无线电头端(RRH)、远程无线电设备(RRE)或远程无线电单元(RRU)。
图7图示了示例节点间干扰消除设备710。节点间干扰消除设备可以被包括在节点中,所述节点可以包括演进节点 B(eNodeB)、基站(BS)、宏演进节点B(宏eNB)、低功率节点(LPN)、微eNB、微微eNB、毫微微eNB、家庭eNB(HeNB)、基带单元(BBU)、远程无线电头端(RRH)、远程无线电设备(RRE)、远程无线电单元(RRU)。节点间干扰消除设备可以包括:接收模块712、信道脉冲响应估计器714、信号干扰估计器716和消除模块718。节点间干扰消除设备还可以包括:解码模块720、发射模块(未示出)、或调度模块(未示出)。接收模块可以被配置成:在节点处从相邻节点接收下行链路信号信息。信道脉冲响应估计器可以被配置成:使用下行链路信号信息估计针对相邻节点和该节点之间的信道的信道脉冲响应。信号干扰估计器可以被配置成:使用下行链路信号信息和信道脉冲响应估计针对所述信道的节点间干扰信号。消除模块可以被配置成:从上行链路信号中除去所估计的节点间干扰信号,以形成节点间干扰补偿的上行链路信号,从而在上行链路信号中基本上消除来自相邻节点的节点间干扰。接收模块可以被进一步配置成:在从上行链路信号中除去所估计的节点间干扰信号之前,从无线设备接收上行链路信号。下行链路信号信息可以在接收上行链路信号之前被接收。发射模块可以被配置成:把该节点的下行链路信号信息发射到相邻节点,并把下行链路信号发射到第二无线设备。
由节点间干扰消除设备接收的上行链路信号可以被表示为:,其中是定义线性卷积的运算符,是由无线设备发射到该节点的上行链路信号,是由相邻节点发射到第二无线设备的下行链路信号,是加性噪声,是该无线设备和该节点之间的信道脉冲响应,以及是该相邻节点和该节点之间的信道脉冲响应,其中节点间干扰信号被表示为:,并且节点间干扰补偿的上行链路信号被表示为:
解码模块可以被配置成:针对由无线设备发射的上行链路信号信息解码节点间干扰补偿的上行链路信号。发射模块可以被配置成:在具有与该节点异步的下行链路/上行链路(DL/UL)帧结构的相邻节点的方向上,发射具有零陷的下行链路信号。接收模块可以被进一步配置成:经由X2信令或回程链路信令(经由线缆连接或光纤连接)接收下行链路信号信息。调度模块可以被配置成:重新调度上行链路(UL)和下行链路(DL)帧或改变UL-DL配置,以减小该节点和该相邻节点之间的帧中的异步DL/UL子帧的数量。
图8图示了示例中央处理模块(CPM)708。CPM可以被包括在节点或发射站中,其可以包括:基带单元(BBU)、演进节点B(eNodeB)、基站(BS)、宏演进节点B(宏eNB)、低功率节点(LPN)、微eNB、微微eNB、毫微微eNB、家庭eNB(HeNB)、和基站(BS)。CPM可以包括信号生成模块706、收发器模块704、信道脉冲响应估计器714、信号干扰估计器716、和消除模块718。CPM还可以包括解码模块720和调度模块(未示出)。信号生成模块可以被配置成:为下行链路节点生成下行链路信号。信道脉冲响应估计器可以被配置成:使用下行链路信号信息估计针对下行链路节点和上行链路节点之间的信道的信道脉冲响应。信号干扰估计器可以被配置成:使用下行链路信号信息和信道脉冲响应估计针对所述信道的节点间干扰信号。收发器模块可以被配置成从无线设备接收上行链路信号。消除模块可以被配置成:从上行链路信号中除去所估计的节点间干扰信号,以形成节点间干扰补偿的上行链路信号,从而在上行链路信号中基本上消除来自下行链路节点的节点间干扰。收发器模块可以被进一步配置成:经由X2信令或回程链路信令(经由线缆连接或光纤连接)发射下行链路信号并接收上行链路信号。
由上行链路节点接收的上行链路信号被表示为:,其中是定义线性卷积的运算符,是由无线设备发射到上行链路节点的上行链路信号,是由下行链路节点发射到第二无线设备的下行链路信号,是加性噪声,是该无线设备和该上行链路节点之间的信道脉冲响应,以及是该下行链路节点和该上行链路节点之间的信道脉冲响应,其中节点间干扰信号被表示为:,并且节点间干扰补偿的上行链路信号被表示为:
解码模块可以被进一步配置为:针对由无线设备发射的上行链路信号信息解码节点间干扰补偿的上行链路信号。收发器模块可以被进一步配置成:在具有与下行链路节点异步的下行链路/上行链路(DL/UL)帧配置的上行链路节点的方向上,发射具有零陷的下行链路信号。调度模块可以被配置成:重新调度上行链路(UL)和下行链路(DL)帧或改变UL-DL配置,以减小下行链路节点和上行链路节点之间的帧中的异步DL/UL子帧的数量。
在另一个示例中,发射站可以与移动设备进行无线通信。图9提供了移动设备(诸如,用户设备(UE)、移动站(MS)、移动无线设备、移动通信设备、平板、手持机、或其它类型的移动无线设备)的示例图示说明。移动设备可以包括一个或多个天线,该天线配置成与节点、宏节点、低功率节点(LPN)、或者发射站(诸如,基站(BS))、演进型节点 B(eNB)、基带单元(BBU)、远程无线电头端(RRH)、远程无线电设备(RRE)、中继站(RS)、无线电设备(RE)、或者其它类型的无线广域网(WWAN)接入点进行通信。移动设备可以配置成使用至少一个无线通信标准进行通信,该标准包括:3GPP LTE、WiMAX、高速分组接入(HSPA)、蓝牙(Bluetooth)和WiFi。移动设备可以使用针对每个无线通信标准的单独天线、或针对多个无线通信标准的共享天线进行通信。移动设备可以在无线局域网(WLAN)、无线个人区域网(WPAN)和/或WWAN中进行通信。
图9还提供了可以被用于来自移动设备的音频输入和输出的麦克风和一个或多个扬声器的图示说明。显示器屏可以是液晶显示器(LCD)屏、或其他类型的显示器屏,诸如,有机发光二极管(OLED)显示器。显示器屏可以被配置为触摸屏。触摸屏可以使用电容、电阻或其他类型的触摸屏技术。应用处理器和图形处理器可以被耦合到内部存储器,以提供处理和显示的能力。非易失性存储器端口还可以被用于把数据输入/输出选项提供给用户。非易失性存储器端口还可以被用于扩展移动设备的存储器容量。键盘可以与移动设备集成到一起,或被无线连接到移动设备,以提供附加的用户输入。虚拟键盘也可以使用触摸屏提供。
各种技术或其某些方面或部分可以采用体现在有形介质(诸如,软盘、CD-ROM、硬盘驱动器、非临时性计算机可读存储介质、或任何其他机器可读存储介质)中的程序代码(即,指令)的形式,其中,当所述程序代码被加载到机器(诸如,计算机)中并且被机器所执行时,所述机器成为用于实施各种技术的装置。在可编程计算机上的程序代码执行的情形下,所述计算设备可以包括:处理器、由处理器可读取的存储介质(包括易失性和非易失性存储器和/或存储元件)、至少一个输入设备、和至少一个输出设备。所述易失性和非易失性存储器和/或存储元件可以是:RAM、EPROM、闪存驱动器、光学驱动器、磁性硬盘驱动器、或用于存储电子数据的其他介质。所述基站和移动设备还可以包括:收发器模块、计数器模块、处理模块、和/或时钟模块或定时器模块。可以实现或使用在此描述的各种技术的一个或多个程序可以使用应用编程接口(API)、可重用控件等。此类程序可以以高级的面向过程或面向对象的编程语言来实现,以与计算机系统进行通信。然而,如果需要,则(一个或多个)程序也可以以汇编或机器语言来实现。在任何情形下,所述语言可以是编译或解释语言,并且与硬件实现方式相结合。
应理解的是:在本说明书中描述的许多功能单元已被标记为模块,以便更特别地强调其实现方式的独立性。例如,模块可以被实现为硬件电路,该硬件电路包括:定制VLSI电路或门阵列、现成(off-the-shelf)的半导体(诸如,逻辑芯片、晶体管)、或其他分立组件。模块还可以在可编程硬件设备(诸如,现场可编程门阵列、可编程阵列逻辑、可编程逻辑设备等)中实现。
模块还可以在供各种类型的处理器执行的软件中实现。例如,可执行代码的所识别模块可以包括:计算机指令的一个或多个物理或逻辑块,其例如可以被组织为对象、过程或函数。然而,所识别模块的可执行体不需要被物理地放置在一起,而是可以包括在不同位置中存储的完全不同的指令,其当被逻辑上连接在一起时包括所述模块并且实现所述模块的上述目的。
实际上,可执行代码的模块可以是单个指令,或许多指令,并且甚至可以跨越数个存储器设备、在不同程序之间且在不同的代码段上被分布。相似地,操作数据在此可以在模块内被说明和识别,并且可以被采用任何适合的形式体现,并且被组织在任何适合类型的数据结构内。操作数据可以被收集为单个数据集合,或可以被分布在不同位置上(包括在不同存储设备上),并且可以至少部分地仅仅作为电子信号存在于系统或网络上。所述模块可以是不活动的或活动的,包括可操作用于执行期望功能的代理。
遍及本说明书,对“示例”的参考意味着:结合示例描述的特定特征、结构、或特性被包括在本发明的至少一个实施例中。因此,在遍及本说明书的各个位置中出现的措辞“在示例中”不一定都指代相同的实施例。
如在此被使用的,多个术语、结构元件、构成要素、和/或材料为了方便可以在通用的列表中呈现。然而,这些列表应被解释为好像所述列表的每个成员作为单独和唯一的成员被单独地识别。因此,此类列表的单独成员不应在没有相反指示的情形下仅基于其在通用组中的呈现而被解释为相同列表的任何其它成员的事实上的等同物。此外,本发明的各种实施例和示例在此可以连同其各种组件的替代物一起被参考。要理解的是:此类实施例、示例、和替代物将不被解释为彼此的事实上的等同物,而是将被解释为本发明的独立和自治的表示。
此外,在一个或多个实施例中,可以采用任何适合的方式组合所描述的特征、结构、或特性。在接下来的描述中,提供了众多特定的细节,诸如,布局的示例、距离、网络示例等,从而提供了对发明的实施例的彻底理解。然而,相关领域的技术人员将认识到:本发明能够在不具有一个或多个所述特定细节的情形下实施,或者采用其它的方法、组件、布局等实施。在其它的实例中,众所周知的结构、材料、或操作未被详细地示出或描述,以避免使本发明的各方面模糊。
尽管之前的示例以一个或多个特定应用说明了本发明的原则,但对于本领域的普通技术人员将显然的是:能够在不具有创造性的劳动并且不背离发明的原则和概念的情形下做出实现方式的形式、使用和细节的众多修改。因此,除了如由下面提出的权利要求限制之外,不旨在限制本发明。

Claims (30)

1.至少一个计算机可读介质,其中存储有用于在受害者节点处消除节点间干扰的指令,当所述指令在机器上被执行时,使所述机器来:
在受害者节点处从侵略者节点接收下行链路信号信息;
使用下行链路信号信息估计针对侵略者节点和受害者节点之间的信道的信道脉冲响应;以及
使用下行链路信号信息和信道脉冲响应估计针对所述信道的节点间干扰信号。
2.如权利要求1所述的至少一个计算机可读介质,具有进一步的指令来:
从无线设备接收上行链路信号,其中下行链路信号信息在接收上行链路信号之前被接收;以及
从上行链路信号中除去所估计的节点间干扰信号,以形成节点间干扰补偿的上行链路信号,从而在上行链路信号中基本上消除来自侵略者节点的节点间干扰。
3.如权利要求2所述的至少一个计算机可读介质,其中无线设备是从包括用户设备(UE)和移动站(MS)的组中选择的移动设备,并且其中所述移动设备包括:天线、触摸敏感显示器屏、扬声器、麦克风、图形处理器、应用处理器、内部存储器、非易失性存储器端口或其组合。
4.如权利要求2所述的至少一个计算机可读介质,其中由受害者节点接收的上行链路信号                                                被表示为:,其中是定义线性卷积的运算符,是由无线设备发射到受害者小区中的受害者节点的上行链路信号,是由侵略者节点发射到第二无线设备的下行链路信号,是加性噪声,是无线设备和受害者节点之间的信道脉冲响应,以及是侵略者节点和受害者节点之间的信道脉冲响应,其中节点间干扰信号被表示为:,并且节点间干扰补偿的上行链路信号被表示为:
5.如权利要求2所述的至少一个计算机可读介质,具有进一步的指令来:
针对由无线设备发射的上行链路信号信息解码节点间干扰补偿的上行链路信号。
6.如权利要求1所述的至少一个计算机可读介质,其中下行链路信号信息被通过经由线缆连接或光纤连接的X2信令或回程链路信令接收。
7.如权利要求1所述的至少一个计算机可读介质,其中估计信道脉冲响应的指令包括进一步的指令来:
从侵略者节点接收参考信号;以及
使用所述参考信号估计所述信道脉冲响应。
8.如权利要求1所述的至少一个计算机可读介质,其中下行链路信号信息是直接信号波形,包括足以重建下行链路信号波形的控制和有效载荷信息,或包括用于重建下行链路波形的特定信息。
9.如权利要求1所述的至少一个计算机可读介质,其中受害者节点和侵略者节点被从包括演进节点B(eNodeB)、基站(BS)、宏演进节点B(宏eNB)、低功率节点(LPN)、微eNB、微微eNB、毫微微eNB、家庭eNB(HeNB)、远程无线电头端(RRH)、远程无线电设备(RRE)、远程无线电单元(RRU)及其组合的组中选择。
10.一种节点间干扰消除设备,包括:
接收模块,被配置成在节点处从相邻节点接收下行链路信号信息;
信道脉冲响应估计器,被配置成使用下行链路信号信息估计针对相邻节点和节点之间的信道的信道脉冲响应;以及
信号干扰估计器,被配置成使用下行链路信号信息和信道脉冲响应估计针对所述信道的节点间干扰信号。
11.如权利要求10所述的节点间干扰消除设备,进一步包括:
消除模块,被配置成从上行链路信号中除去所估计的节点间干扰信号,以形成节点间干扰补偿的上行链路信号,从而在上行链路信号中基本上消除来自相邻节点的节点间干扰;
其中接收模块被进一步配置成:在从上行链路信号中除去所估计的节点间干扰信号之前,从无线设备接收上行链路信号,其中下行链路信号信息在接收上行链路信号之前被接收。
12.如权利要求11所述的节点间干扰消除设备,进一步包括:
发射模块,被配置成:把针对节点的下行链路信号信息发射到相邻节点,并把下行链路信号发射到第二无线设备。
13.如权利要求11所述的节点间干扰消除设备,其中由节点间干扰消除设备接收的上行链路信号被表示为:,其中是定义线性卷积的运算符,是由无线设备发射到节点的上行链路信号,是由相邻节点发射到第二无线设备的下行链路信号,是加性噪声,是无线设备和节点之间的信道脉冲响应,以及是相邻节点和节点之间的信道脉冲响应,其中节点间干扰信号被表示为:,并且节点间干扰补偿的上行链路信号被表示为:
14.如权利要求11所述的节点间干扰消除设备,进一步包括:
解码模块,被配置成针对由无线设备发射的上行链路信号信息解码节点间干扰补偿的上行链路信号。
15.如权利要求11所述的节点间干扰消除设备,进一步包括:
发射模块,被配置成在具有与节点异步的下行链路/上行链路(DL/UL)帧配置的相邻节点的方向上发射具有零陷的下行链路信号。
16.如权利要求10所述的节点间干扰消除设备,其中接收模块被进一步配置成:通过经由线缆连接或光纤连接的X2信令或回程链路信令接收下行链路信号信息。
17.如权利要求10所述的节点间干扰消除设备,进一步包括:
调度模块,被配置成重新调度上行链路(UL)和下行链路(DL)帧或改变UL-DL配置,以减小节点和相邻节点之间的帧中的异步DL/UL子帧的数量。
18.如权利要求10所述的节点间干扰消除设备,其中节点被从包括演进节点B(eNodeB)、基站(BS)、宏演进节点B(宏eNB)、低功率节点(LPN)、微eNB、微微eNB、毫微微eNB、家庭eNB(HeNB)、基带单元(BBU)、远程无线电头端(RRH)、远程无线电设备(RRE)、远程无线电单元(RRU)及其组合的组中选择。
19.至少一个非临时性计算机可读介质,在其中具有在中央处理模块(CPM)处消除节点间干扰的指令,当所述指令在机器上被执行时使所述机器来:
在CPM处为下行链路节点生成下行链路信号;
使用下行链路信号估计针对下行链路节点和上行链路节点之间信道的信道脉冲响应;以及
使用下行链路信号和信道脉冲响应确定针对所述信道的节点间干扰信号。
20.如权利要求19所述的至少一个计算机可读介质,具有进一步的指令来:
经由下行链路节点发射下行链路信号;
在与下行链路信号被发射基本相同的时间在CPM处经由上行链路节点从无线设备接收上行链路信号;以及
从上行链路信号中除去所接收的节点间干扰信号,以形成节点间干扰补偿的上行链路信号,从而在上行链路信号中基本上消除来自下行链路节点的节点间干扰。
21.如权利要求20所述的至少一个计算机可读介质,其中由上行链路节点接收的上行链路信号被表示为:,其中是定义线性卷积的运算符,是由无线设备发射到上行链路节点的上行链路信号,是由下行链路节点发射到第二无线设备的下行链路信号,是加性噪声,是无线设备和上行链路节点之间的信道脉冲响应,以及是下行链路节点和上行链路节点之间的信道脉冲响应,其中节点间干扰信号被表示为:,并且节点间干扰补偿的上行链路信号被表示为:
22.如权利要求20所述的至少一个计算机可读介质,具有进一步的指令来:
针对由无线设备发射的上行链路信号信息解码节点间干扰补偿的上行链路信号。
23.如权利要求19所述的至少一个计算机可读介质,其中通过经由线缆连接或光纤连接的X2信令或回程链路信令从上行链路节点接收上行链路信号并且把下行链路信号发射到下行链路节点。
24.如权利要求19所述的至少一个计算机可读介质,其中CPM从包括演进节点B(eNodeB)、基站(BS)、宏演进节点B(宏eNB)或基带单元(BBU)及其组合的组中被选择,并且下行链路节点和上行链路节点从包括演进节点B(eNodeB)、基站(BS)、宏演进节点B(宏eNB)、低功率节点(LPN)、微eNB、微微eNB、毫微微eNB、家庭eNB(HeNB)、远程无线电头端(RRH)、远程无线电设备(RRE)、远程无线电单元(RRU)及其组合的组中被选择。
25.如权利要求19所述的至少一个计算机可读介质,具有进一步的指令来:
重新调度上行链路(UL)和下行链路(DL)帧或改变UL-DL配置以减小上行链路节点和下行链路节点之间的帧中的异步DL/UL子帧的数量。
26.一种中央处理模块(CPM),包括:
信号生成模块,被配置成为下行链路节点生成下行链路信号;
信道脉冲响应估计器,被配置成使用下行链路信号信息估计针对下行链路节点和上行链路节点之间的信道的信道脉冲响应;
信号干扰估计器,被配置成使用下行链路信号信息和信道脉冲响应估计针对所述信道的节点间干扰信号。
27.如权利要求26所述的CPM,进一步包括:
收发器模块,被配置成从无线设备接收上行链路信号;
消除模块,被配置成从上行链路信号中除去所估计的节点间干扰信号,以形成节点间干扰补偿的上行链路信号,从而在上行链路信号中基本上消除来自下行链路节点的节点间干扰。
28.如权利要求27所述的CPM,其中由上行链路节点接收的上行链路信号被表示为:,其中是定义线性卷积的运算符,是由无线设备发射到上行链路节点的上行链路信号,是由下行链路节点发射到第二无线设备的下行链路信号,是加性噪声,是无线设备和上行链路节点之间的信道脉冲响应,以及是下行链路节点和上行链路节点之间的信道脉冲响应,其中节点间干扰信号被表示为:,并且节点间干扰补偿的上行链路信号被表示为:
29.如权利要求27所述的CPM,其中收发器模块被进一步配置成:通过经由线缆连接或光纤连接的X2信令或回程链路信令发射下行链路信号并接收下行链路信号。
30.如权利要求26所述的CPM,其中被包括在发射站中的CPM从包括基带单元(BBU)、演进节点B(eNodeB)、基站(BS)、宏演进节点B(宏eNB)、低功率节点(LPN)、微eNB、微微eNB、毫微微eNB、家庭eNB(HeNB)、基站(BS)及其组合的组中被选择。
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