CN102946265A - 宽带无线网络中用于切换天线和信道分配的方法和系统 - Google Patents
宽带无线网络中用于切换天线和信道分配的方法和系统 Download PDFInfo
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Abstract
公开了一种宽带无线网络中用于切换天线和信道分配的方法和系统。所述方法包括:测量由第一和第二天线资源支持的多个OFDMA子载波的信道特性,其指示多个OFDMA子载波中的对应OFDMA子载波的接收质量,第一和第二天线资源包括多个天线;把对应于测量的一个或多个信道特性的数据发送到基站;接收一个或多个OFDMA子载波的分配的通知,其中分配至少基于第一和第二天线资源的测量的一个或多个信道特性,并且分配的至少一个OFDMA子载波不同于第一和第二天线资源;周期性地测量由所述基站的第一和第二天线资源支持的子载波的信道特性,来更新一个或多个信道特性;发送更新数据;接收OFDMA子载波的被重新分配的通知,重新分配基于第一和第二天线资源的更新的信道特性。
Description
本申请是国际申请日为2005年12月7日,进入国家阶段日为2007年6月5日,申请号为200580041761.0,题为“宽带无线网络中用于切换天线和信道分配的方法和系统”的中国发明专利申请的分案申请。
技术领域
本发明涉及通信系统领域;更具体地,本发明涉及无线网络中用于切换信道和天线分配的技术。
背景技术
利用天线阵列的空间处理是无线通信中使用最多的技术之一。在至今所开发的许多方案当中,多输入多输出(MIMO)和波束形成是经常研究的方案,并且已被证明在增加无线网络的容量和性能方面是有效的(例如,参见Ayman F.Naguid、Vahid Tarokh、Nambiraj an Seshadri、A.RobertColderbank的“A Space-Time Coding Modem for High-Data-RateWireless Communications”,IEEE Journal on Selected Areas inCommunications,vol.16,no.8,October 1998pp.1459-1478)。另一方面,MIMO或波束形成的实现往往意味着系统侧的较高的复杂度和成本。具体地,MIMO操作需要复杂的信号处理和解码,而波束形成涉及硬件校准和多维数据处理。
这些年来,正交频分多址(OFDMA)已成为几乎所有宽带无线网络(例如,WiMAX、WiFi和4G蜂窝系统)选择的接入方案。在OFDMA中,以类似于频分多址(FDMA)的方式,多个用户被分配给不同的子载波。更多信息请参见Sari和Karam的“Orthogonal Frequency-DivisionMultiple Access and its Application to CATV Networks”,EuropeanTransactions on Telecommunications,Vol.9(6),pp.507-516,Nov./Dec.1998;以及Nogueroles、Bossert、Donder和Zyablov的“ImprovedPerformance of a Random OFDMA Mobile Communication System”,Proceedings of IEEE VTC’98,pp.2502-2506。
使得难以实现可靠的无线传输的主要现象是时变多径衰落。在多径衰落信道中提高质量或者减小有效错误率(effective error rate)可能是极其困难的。例如,考虑下面的非多径环境中的典型噪声源与多径衰落之间的比较。在具有加性白高斯噪声(AWGN)的环境中,使用典型的调制和编码方案将有效误比特率(BER)从10”减少到10”,可能仅需要高出1db或2db的信噪比(SNR)。但是,在多径衰落环境中实现同样的减少,可能需要提高SNR多达10db。必要的SRN的提高仅仅通过提供更高的发射功率或者附加的带宽可能不能实现,因为这与下一代宽带无线系统的需求相反。
多径现象引起频率选择性衰落。在多用户衰落环境中,子载波不同,信道增益也不同。而且,对于不同的用户,信道通常是不相关的。这导致所谓的“多用户分集”增益,可以通过智能子载波分配对其进行利用。换句话说,在OFDMA系统中,有利地将子载波自适应性地分配给用户,使得每个用户获得高信道增益。更多信息请参见Wond等人的“MultiuserOFDM with Adaptive Subcarrier,Bit and Power Allocation”,IEEE J.Select.Areas Commun.,Vol.17(10),pp.1747-1758,October 1999。
在一个小区中,可以协调多个用户以便具有OFDMA中的不同子载波。可以使不同用户的信号正交并且小区内干扰很小。但是,在大胆的频率重用规划中,例如将相同的频谱用于多个相邻的小区,产生了小区间干扰的问题。显然,OFDMA系统中的小区间干扰也是频率选择性的,并且有利地对子载波进行自适应分配,以便降低小区间干扰的影响。
用于OFDMA的子载波分配的一种方法是联合优化操作,其不仅需要所有小区中所有用户的行为和信道知识,而且每次现有用户从网络掉线或者新用户加到网络上时,需要频繁的重新调度。这在现实的无线系统中往往是不切实际的,主要原因在于用于更新用户信息的带宽成本和用于联合优化的计算成本的原因。
用于无线业务信道分配的现有方法本质上是用户发起的,并且是单用户(点对点)的。由于多址网络的总吞吐量依赖于所有激活用户的信道衰落分布、噪声加干扰水平以及收发机在空间上分离的情况下的空间信道特性,所以分布式的或基于用户的信道加载方法基本上是次最优的。此外,在多个收发机被用作基站时,用户发起的加载算法是有问题的,原因是基于全向探测信号(omni-directional sounding signal)所测量的信号与噪声加干扰比(SINR)并不表明具有空间处理增益的特定业务信道的实际质量。换句话说,在用户处基于全向探测信号所测量的“不好的”业务信道很可能是具有适当的来自基站的空间波束形成的“好的”信道。由于这两个原因,非常需要考虑所有接入用户的(空间)信道状况及其QoS要求的新的信息交换机制以及信道分配和加载协议。这种“空间信道和QoS感知的”分配方案可以在给定带宽下相当大地增加频谱效率,从而相当大地增加数据吞吐量。因此,分布式方法、即用户发起的分配基本上是次最优的。
发明内容
这里公开了一种在无线通信系统中用于天线切换和信道分配的方法和设备。指示信号接收质量的信道特性针对基站处的每个天线资源所支持的多个信道中的每个信道而获得。信道基于基站信道特性分配给用户。
根据本发明的一个方面,提供了一种用于无线通信的方法,所述方法包括:在用户站处测量由位于基站处的第一天线资源和第二天线资源支持的多个正交频分多址(OFDMA)子载波的一个或多个信道特性,其中所述一个或多个信道特性指示所述多个OFDMA子载波中的对应OFDMA子载波的接收质量,并且其中所述第一天线资源和所述第二天线资源包括多个天线;把对应于测量的所述一个或多个信道特性的数据从所述用户站发送到所述基站;在所述用户站处接收所述多个OFDMA子载波中的一个或多个OFDMA子载波的分配的通知,其中所述分配至少基于所述第一天线资源和所述第二天线资源的所述测量的所述一个或多个信道特性,并且其中所述分配的所述多个OFDMA子载波中的至少一个OFDMA子载波不同于所述第一天线资源和所述第二天线资源;通过周期性地在所述用户站处测量由所述基站的所述第一天线资源和所述第二天线资源支持的所述多个OFDMA子载波的所述一个或多个信道特性,来周期性地更新所述测量的所述一个或多个信道特性;把对应于周期性地测量的所述一个或多个信道特性的更新数据周期性地从所述用户站发送到所述基站;以及接收所述多个OFDMA子载波中的一个或多个被重新分配的OFDMA子载波的重新分配的通知,其中所述重新分配至少基于所述第一天线资源和所述第二天线资源的更新的所述测量的所述一个或多个信道特性。
根据本发明的一个方面,提供了一种用于无线通信的方法,所述方法包括:使用户站与基站同步;把测试数据从所述用户站传送至所述基站的第一天线资源和第二天线资源,其中在所述基站处测量对应于所述第一天线资源和所述第二天线资源的多个正交频分多址(OFDMA)子载波的一个或多个上行信道特性,其中所述一个或多个上行信道特性指示所述多个OFDMA子载波中的对应OFDMA子载波的接收质量,并且其中所述第一天线资源和所述第二天线资源包括多个天线;在所述用户站处接收所述多个OFDMA子载波中的一个或多个OFDMA子载波的分配的通知,其中所述分配至少基于所述第一天线资源和所述第二天线资源的所述一个或多个上行信道特性,并且其中所述分配的所述多个OFDMA子载波中的至少一个OFDMA子载波不同于所述第一天线资源和所述第二天线资源;以及把对应于所述一个或多个上行信道特性的数据从所述用户站发送到所述基站。
根据本发明的一个方面,提供了一种用于无线通信的用户站,所述用户站包括:控制器,其被配置成:测量由位于基站处的第一天线资源和第二天线资源支持的多个正交频分多址(OFDMA)子载波的一个或多个信道特性,其中所述一个或多个信道特性指示所述多个OFDMA子载波中的对应OFDMA子载波的接收质量,并且其中所述第一天线资源和所述第二天线资源包括多个天线;以及通过周期性地测量由所述基站的所述第一天线资源和所述第二天线资源支持的所述多个OFDMA子载波的所述一个或多个信道特性,来周期性地更新所述测量的所述一个或多个信道特性;以及收发器,其被配置成:把对应于测量的所述一个或多个信道特性的数据发送到所述基站;接收所述多个OFDMA子载波中的一个或多个OFDMA子载波的分配的通知,其中所述分配至少基于所述第一天线资源和所述第二天线资源的所述测量的所述一个或多个信道特性,并且其中所述分配的所述多个OFDMA子载波中的至少一个OFDMA子载波不同于所述第一天线资源和所述第二天线资源;把对应于周期性地测量的所述一个或多个信道特性的更新数据周期性地发送到所述基站;以及接收所述多个OFDMA子载波中的一个或多个被重新分配的OFDMA子载波的重新分配的通知,其中所述重新分配至少基于所述第一天线资源和所述第二天线资源的更新的所述测量的所述一个或多个信道特性。
根据本发明的一个方面,一种用于无线通信的用户站,所述用户站被配置成:与基站进行同步;把测试数据传送至所述基站的第一天线资源和第二天线资源,其中在所述基站处测量对应于所述第一天线资源和所述第二天线资源的多个正交频分多址(OFDMA)子载波的一个或多个上行信道特性,其中所述一个或多个上行信道特性指示所述多个OFDMA子载波中的对应OFDMA子载波的接收质量,并且其中所述第一天线资源和所述第二天线资源包括多个天线;接收所述多个OFDMA子载波中的一个或多个OFDMA子载波的分配的通知,其中所述分配至少基于所述第一天线资源和所述第二天线资源的所述一个或多个上行信道特性,其中所述分配的所述多个OFDMA子载波中的至少一个OFDMA子载波不同于所述第一天线资源和所述第二天线资源;以及把对应于所述一个或多个上行信道特性的数据从所述用户站发送到所述基站。
附图说明
根据下面给出的具体描述以及本发明各实施例的附图,将可以更全面地理解本发明,但是,上述附图不应该被用来将本发明限制到特定的实施例,而仅仅是用于说明和理解。
图1示出了采用一对用于与各个用户通信的切换天线的基站,其中,每个用户被分配了对应于相应的子信道/天线组合的信道。
图2示出了在新的用户进入前,针对图1所述用户的OFDMA子信道分配。
图3a示出了由图1中的每个天线发出的信标信号,其由新用户接收并且包含各个信道,新用户可以通过该信标信号测量下行链路或双向链路信道特性,这些特性被返回到基站。
图3b示出了由新用户发出并且包含通过各个信道发送的测试数据的测距信号(ranging signal),通过该测距信号,可以在图1的每个切换天线处测量上行或双向信道特性。
图4a示出了说明使用图3a的信标信号方案、为获得下行或双向链路信道特性而执行的操作的流程图。
图4b示出了说明使用图3b的测距信号方案、为获得上行或双向链路信道特性而执行的操作的流程图。
图5示出了与针对图1的切换天线的信道特性相对应的示例性的用户信道响应。
图6示出了针对具有多个天线资源的基站,将信道分配给各个用户而执行的操作,其中,基于针对每个天线测量或估计的子信道特性,将包括最佳可用子信道/天线组合的信道分配给新用户。
图7是OFDMA/SDMA基站的一个实施例的框图。
图8示出了采用多个切换天线的OFDMA发射机模块的架构。
具体实施方式
OFDMA和空间处理的结合为多用户宽带通信提供了强大的平台。本发明描述了一种方法、设备和系统,用于将OFDMA与各种配置的天线阵列的轻松地整合在一起。上述方法和设备允许以简单的天线操作来利用多用户分集,因此增加了无线通信系统的容量和性能。在一个实施例中,指示每个信道(例如,OFDMA子信道/天线资源组合)的下行或双向业务的信号接收质量的信道特性在用户处测量或估计。对应的信道特性信息被返回到基站。信道特性信息也可以针对在多个接收天线资源中的每个接收天线资源处所接收的上行或双向信号来测量或估计。基站基于针对上行、下行和/或双向信道而测量和/或估计的信道特性,采用信道分配逻辑来为多个用户分配上行、下行和/或双向信道。
本发明的有利之处包括硬件较为简单(比波束形成天线阵列便宜得多)和处理较为容易(比MIMO简单得多),而不牺牲总的系统性能。除了OFDMA实现之外,其普遍原理也可以用于FDMA(频分多址)、TDMA(时分多址)、CDMA(码分多址)、OFDMA和SDMA(空分多址)方案,以及这些多址方案的组合。
在下面的描述中,阐述众多细节是为了对本发明进行更全面的说明。但是,对本领域技术人员来说,显然可以不需要这些具体细节来实施本发明。在其它实例中,公知的结构和装置以框图的形式示出,而不是具体示出,以避免使本发明不清晰。
以下的部分具体描述采用对计算机存储器中的数据比特的操作的算法和符号表示的形式来提供。这些算法描述和表示是数据处理领域的技术人员将其工作的实质传达给本领域其他技术人员的最有效手段。在这里,算法通常被认为是通向期望结果的自洽的步骤序列。这些步骤是需要对物理量的物理操纵的步骤。通常这些量采用能够被存储、传送、组合、比较和操纵的电信号或磁信号的形式,虽然这并不是必须的。已经证明,主要是为了普遍使用,有时称这些信号为比特、值、元素、符号、字符、项目、数字等是方便的。
但是,应该牢记,所有这些及类似术语要与适当的物理量相关联,并且仅仅是应用于这些量的方便标记。除非特别说明,否则,如同从以下讨论中容易看出的那样,应当理解,在整个说明书中,使用诸如“处理”或“计算”或“推算”或“确定”或“显示”等术语的讨论指的是计算机系统或类似电子计算装置的动作和处理,该计算机系统或类似电子计算装置对在计算机系统的寄存器和存储器中表示为物理(电子)量的数据进行操纵并将其转换成在计算机系统存储器或寄存器或其它这样的信息存储、传输或显示装置中类似地表示为物理量的其它数据。
本发明还涉及用于执行这里所述的操作的设备。该设备可以针对需要的目的而专门构建,或者其可以包括通用计算机,由存储在该计算机中的计算机程序选择性地激活或重新配置。这种计算机程序可以存储在计算机可读的存储介质中,如任何类型的盘,包括软盘、光盘、CD-ROM以及磁-光盘、只读存储器(ROM)、随机存取存储器(RAM)、EPROM、EEPROM、磁或光卡、或者适合于存储电子指令的任何类型的介质,但不限于此,并且分别耦合到计算机系统总线。
这里所提出的算法和显示并非固有地与任何特定的计算机或其它设备相关。各种通用系统可以用于根据本文教导的程序,或者构建较为专用的设备来执行所需的方法步骤可能是方便的。从以下描述中将看出各种这些系统所需的结构。另外,本发明并不是针对任何特定编程语言来描述的。应当理解,各种编程语言可以用于实现这里所描述的本发明的教导。
机器可读介质包括用于存储或传输机器(例如计算机)可读形式的信息的任何机构。例如,机器可读介质包括只读存储器(“ROM”);随机存取存储器(“RAM”);磁盘存储介质;光存储介质;闪存装置;电的、光的、声的或其它形式的传播信号(例如载波、红外信号、数字信号等);等等。
概述
由于空间信道特性的宽带性质,高速无线网络中的空间分集的高效利用是具有挑战性的任务。在OFDMA网络中,宽的频谱被分割成并行的窄带业务信道(通常称为“子信道”)。这里描述的方法提供了用于通过智能业务信道分配来分配业务信道的方法。
在这里所述的通信系统中,信道分配逻辑执行“信道感知的”业务信道分配。在一个实施例中,信道分配逻辑提供需要的带宽和对频谱资源(例如,OFDMA业务信道)及空间资源(例如,当其属于空间波束形成时,用户的物理位置)的有效使用,并且基于请求的用户和正在进行业务的用户(on-going subscriber)的宽带空间信道特性执行业务信道分配。而且,基于针对用户的最佳天线资源,将信道分配给这些用户。因此,与使用传统的信道分配方法通常可获得的性能相比,上述信道分配提供了相对于更多用户的提高的性能。
响应于来自新用户的链接请求,或者当基站有数据要发送到待机用户时,所述逻辑首先估计通过对于每个天线资源的全部或所选部分的OFDMA业务信道而接收的传输的信道特性。这里所使用的天线资源可以包括单个天线,或者(给定基站的天线阵列中)共同用于发射信号和/或从用户接收信号的天线的子阵列。例如,通过使用一个或多个信号分集方案(空间、频率和/或时间),可以将多个天线配置成(高效地)用作具有改善的发射特性(与单个天线相比)的单个天线资源。在一个实施例中,信道特性与针对正在进行业务的用户的信道分配一起用于确定对于每个用户,哪个天线资源是最优的。信道特性数据可以存储在寄存器或其它类型的存储单元(例如,数据库、文件或类似数据结构)中。在一个实施例中,与具有最佳通信特性的天线资源相对应的业务信道被分配给接入用户以满足该接入用户的服务请求。
图1示出了包括基站102的宽带无线网络100的示例性的部分,其中,基站102实现这里所述的信道选择技术。基站102包括支持与如移动(电话)用户104和106、固定(位置)用户108和110以及移动(PDA)用户112所示的各个用户进行通信的设备。这些设备包接收模块114、发射模块116和信道管理部件118以及天线120A(这里也称为天线#1)和天线120B(这里也称为天线#2)。
通常,基站以下面的方式与用户通信。数据突发(data burst)如蜂窝包、IP包或以太网帧被封装成适当的数据帧格式(例如,针对WiMAX网络的IEEE 802.16)并且从网络部件如无线接入节点(RAN)转发到给定小区中的适当基站。基站接着使用称为“下行链路”的单向无线链路发送到所选用户(由数据帧标识)。从用户到网络100的数据传输以相反的方向进行。这种情况下,使用称为“上行链路”的单向无线链路将经封装的数据从用户发送到适当的基站。数据包接着被转发到适当的RAN,转换成IP包,并且之后传送到网络100中的目的节点。在一些类型的宽带无线网络中,数据突发可以使用频分复用(FDD)或者时分复用(TDD)方案来传输。在TDD方案中,上行链路和下行链路两者共享同一RF(射频)信道,但不是同时传输,而在FDD方案,上行链路和下行链路在不同的RF信道上工作,但是信道可以同时传输。通常,单向无线下行链路可以包括点对点(PP)链路、点对多点链路(PMP)或者MIMO链路。上行链路通常包括PP或PMP链路,尽管也可以使用MIMO链路。
多个基站被配置为形成类蜂窝无线网络,其中,对于任何给定位置处的给定用户,可以使用共享介质(无线电波借以传播的空间(空气))来接入一个或多个基站。利用共享介质的网络需要有效共享该共享介质的机制。空气介质的共享是通过适当的基于信道的方案来实现的,其中,相应的信道分配给给定基站的接入范围中的每个用户。典型的基于信道的传输方案包括FDMA、TDMA、CDMA、OFDMA和SDMA,以及这些多访问方案的组合。这些传输方案中的每个传输方案在无线组网领域都是公知的。
为便于与各个用户的下行链路和上行链路通信,基站102提供多个天线。为了说明的目的,这些天线在图1中以天线120A和天线120B(天线#1和#2)示出。来自多个天线中的两个或更多个天线的信号可以被组合以支持波束形成或空间复用,或者可以通过使用公知技术来单独用于不同组的用户。多个天线还可以配置成一个或多个簇。通常,天线120A和120B代表无线宽带网络中采用的各种天线类型,包括扇形天线和全向天线。
在一个实施例中,每个用户被分配给由给定基站处的一个天线(或者当多个天线被组合而发射或接收信号时的天线资源)提供的相应信道或子信道。例如,在图1所示的配置中,移动用户104和固定用户110被分配给相应的由天线120A支持的信道,而固定用户108和移动用户106和112被分配给相应的由天线120B支持的信道。如以下更具体说明的,针对每个用户的信道/天线或子信道/天线基于新用户经由给定基站(例如,基站102)而进入网络时的最佳可用信道特性来选择。另外,信道可以基于测量的信道特性的变化而重新分配给正在进行业务的用户。
为举例说明,以下讨论涉及OFDMA网络的信道分配。但是,这并不意味着限制,因为类似的原理可以应用于采用其它基于信道的传输方案的无线网络,包括FDMA、TDMA、CDMA、SDMA和OFDMA/SDMA、以及这些方案的其它组合。
根据本发明的方面,现在公开了一种基于当前信道特性,将相应用户的下行和/或上行或共享(双向)信道分配给所选天线资源的信道分配方案。总的方法是将具有最佳信道特性的信道/天线或者子信道/天线组合分配给新用户和正在进行业务的用户。
图2示出了针对图1所示的各个用户的一组初始OFDMA信道分配。在所示的实施例中,天线#1和#2(120A和120B)中的每个支持N个子信道。通常,每个用户被分配有给定天线或天线资源的相应子信道。在一些情况下,可以针对同一用户分配多个子信道。为了说明的目的,仅仅单个一组子信道分配在图2中示出,其中,该单个一组说明了上行、下行或共享(用于上行和下行的同一信道)信道分配。应当理解,对于下行和上行业务采用分离信道的传输方案,还将存在另一组信道分配。
参考图1和图3a,现在假设新的移动用户122试图通过发起新的业务请求或者结合从另一(当前)服务基站(未示出)到基站102的交递,来发起与基站102的业务。如上所述,希望将最佳可用信道分配给该新用户。因此,提供了一种确定最佳可用信道的机制。
进一步参考图4a的流程图,用于确定信道特性的过程的一个实施例从块400开始,其中,基站从其每个天线资源广播覆盖分配给该基站的频率带宽上的所有子信道的信标信号。例如,在FDMA方案中,广播信号可包括这样的信号,其使用预定的周期在所分配的带宽上变化频率。在CDMA方案中,可以使用通过以循环方式变化的各个CDMA信道来传输的测试信号。在支持对相同频率进行操作的多个信道的信道方案(如OFDMA)中,广播信号将每天线资源包括适用的子信道/频率组合(OFDMA信标信号方案的一个实施例的更多细节在下面描述)。结果,广播信标信号将提供这样的信息,根据该信息,可以确定空间和频率信道特性。在一个实施例中,信标信号实时地通过管理信道广播。在一些基于时隙的信道方案(例如,OFDMA、CDMA、TDMA)的情况下,可能有必要首先进行基站和用户之间的时序同步,以使用户能够与广播信标信号充分协调(例如,同步)。
响应于信标信号,用户(装置)调谐其接收单元以遍历各个信道(与信标信号中的信道变化同步),同时测量信道特性。例如,在一个实施例中,信号与干扰加噪声比(SINR,对于一些类型的无线网络,通常也称为载波与干扰加噪声比(CINR))和/或相对信号强度指示(RSSI)测量在用户处进行,以获得信道特性测量值或估计值。在一个实施例中,信道特性测量与可以针对不同信道而可靠获得的数据速率有关,如图5中所示的对应于天线#1和#2的信道特性测量数据组(图3a中示出简化版本)所举例示出的。例如,常用的是测量这样的以每秒每赫兹的比特数表示的数据速率,如图5所示。在另一实施例中,针对每个信道/天线资源组合进行BER测量。在又一实施例中,测量服务质量(QoS)参数如时延和抖动以获得信道特性数据。在又一实施例中,可以测量和/或估计信号质量/性能的各种指标,以获得信道特性数据。
继续图4a中的块404,在获取信道特性测量值后,或者在获取信道特性测量值时,对应的数据被返回到基站。在一个实施例中,该信息经由用于这种目的的管理信道返回。作为响应,根据当前信道可用性信息和信道特性数据,选择最佳可用信道分配给用户。选择过程的细节在下面参考图6描述。
示例性的OFDMA下行链路/双向链路信道表征
在针对OFDMA网络采用的一个实施例中,每个基站向其小区(或扇区)中的每个用户周期性地广播导频OFDM符号。常常被称为探测序列或信号的该导频符号对于基站和用户两者都是已知的。在一个实施例中,每个导频符号覆盖整个OFDM频率带宽。对于不同的小区(或扇区),导频符号可以不同。导频符号可以用于多个目的:时间和频率同步、信道估计和用于子信道分配的SINR测量。
在一个实施例中,多个天线资源中的每个天线资源同时发射导频符号,并且每个导频符号占用整个OFDM频率带宽。在一个实施例中,每个导频符号具有128微秒的长度或持续时间,且具有保护时间,其组合大约是152微秒。在每个导频周期之后,有预定数目的数据周期,其后跟着另一组导频符号。在一个实施例中,每个导频之后有四个数据周期被用来传输数据,并且每个数据周期的长度是152微秒。
在导频OFDM符号被广播时,针对每个子信道,每个用户连续监视导频符号的接收并且测量(例如,估计)SINR和/或其它参数,包括小区间干扰和小区内业务。在一个实施例中,用户首先估计信道响应,包括幅度和相位,好像没有干扰或噪声一样。一旦信道被估计,用户根据所接收的信号来计算干扰/噪声。
在数据业务周期期间,用户可以再次确定干扰电平。数据业务周期被用于估计小区内业务以及子信道干扰电平。具体地,在导频和业务周期期间的功率差可以用于检测该(小区内)业务加载和子信道间干扰,以便选择期望的子信道。
在一个实施例中,每个用户测量每个子信道(或者对应于可用子信道的一组子信道)的SINR并且通过接入信道向它们的基站报告这些SINR测量值。从每个用户到基站的信息反馈包括用于每个子信道的SINR值(例如,峰值或平均值)。信道索引方案可以用来标识用于每个子信道的反馈数据;如果反馈中信息的顺序对于基站是预先知道的,则不需要索引。
在接收来自用户的反馈时,基站以类似于以下所述的方式来选择子信道分配给用户。在子信道选择之后,基站通过下行公共控制信道,或者在已经建立与用户的连接的情况下通过专用下行业务信道,向用户通知子信道分配。在一个实施例中,基站还向用户通知适当的调制/编码速率。一旦建立基本的通信链路,每个用户可以使用专用业务信道(例如,一个或多个预定义的上行接入信道)继续向基站发送反馈。
前述方案确定针对下行链路和共享双向链路信道的信道特性。但是,其对于预测上行信道特性可能是不够的。原因是多径衰落通常是单向的。结果,产生良好下行信道特性(在接收用户处测量)的信道可能不提供良好的上行信道特性(在接收基站处测量)。
参考图3b和图4b,用于确定针对上行信道(或者任选地,双向共享信道)的信道特性的过程的一个实施例从块450(图4b)开始,其中,用户执行与基站处的每个天线资源的测距。术语“测距”由WiMAX(IEEE802.16)标准用来定义用户台(subscriber station)用以从一个或更多基站获得服务可用性和信号质量信息的一组操作。在该过程期间,用户台与基站进行同步,并且一系列消息在用户台和基站之间交换。而且,信号质量测量值可以通过在基站和/或用户台执行CINR和/或RSSI测量而获得。
这里所使用的“测距”通常涉及由用户发起以使上行信道特性能够由基站测量的发射动作;因此,测距包括前述由WiMAX规范针对WiMAX网络所定义的测距操作,以及其它用于获得上行信道特性的技术。例如,与WiMAX测距期间所采用的操作相类似的操作可以用于其它类型的宽带无线网络。在一个实施例中,用户和基站交换关于信道序列的信息,其中,信道特性测量将通过该信道序列来进行。例如,在一些实施中,基站可以仅仅标识未用的上行信道来进行测量,从而减少将要执行的测量的数目。任选地,信道序列可以预先知道。
继续块452,根据信道序列信息,用户遍历适用的上行信道,同时向每个基站天线资源发射测试数据。通常,这可以针对所有单独的天线或组合的天线资源来同时执行,或者可以针对每个天线资源单独执行。结合通过每个上行信道的测试数据的传输,信道特性测量在块452中由基站进行,并且在块454中存储。通常,在块452中进行的信道特性测量与块402(图4a)中执行的信道特性测量类似,除了现在测量是在基站而不是在用户处进行。待分配给用户的最佳可用上行信道接着在块456中以现在将参考图6的操作描述的方式选出。
更具体地,图6示出了用于在基站的通用配置下进行信道分配的过程,其中,基站具有可变数目的用户(订户)、天线(单独的天线或组合的天线资源)和针对每个天线或组合天线资源的子信道。因此,在图6中,包括对用户和天线的数目、子信道的数目以及每天线的最大子信道数目进行限定的初始输入的一组数据600被提供给在数据600下面所示的处理操作。
如开始和结束循环块602和612所示,针对用户1到P中的每个用户进行块604、606和610中示出的操作。首先,在块604中,在所有可用天线(或组合的天线资源,如果适用的话)当中选择具有最高增益的可用子信道。如输入数据块606所示,维持并实时更新针对每个天线的一组可用子信道,以便向块604提供当前的子信道分配信息。另外,块402和/或452(如果适用的话)中测量的信道特性分布数据被存储在用户信道分布寄存器608中并且实时更新。在针对特定用户的信道选择期间,从用户信道分布寄存器608中检索对应的信道特性分布数据作为块604的输入。
根据来自数据块606和608的输入数据,在块610中,子信道k和天线/被分配给用户i。所述过程接着前进到下一个用户(例如用户/+1),以便根据来自数据块606和608的更新的输入数据,通过块604的操作,为该用户分配包括子信道/天线组合的信道。通常,这些操作实时地重复。
从根据本文图中示出的网络参与者的示例性信道分配参数中可以更清楚地理解这些概念。例如,图2示出了初始状况,其中,分别向移动用户106和固定用户110分配了包括天线#1的子信道1和6的信道,而向固定用户108分配了包括天线#2的子信道2的信道,并且分别向移动用户104和112分配了包括天线#2的子信道5和M-1的信道。为了说明,这些信道分配表示上行链路、下行链路或双向链路信道分配。对于以下示例,假设对应的信道分配信息存在于数据块606中。
现在,假设移动用户122(图1、图3a和图3b)试图进入网络。首先,如果适用的话,将根据图4a和/或图4b所示的流程图的操作,收集信道特性测量数据。这将更新用户信道分布寄存器608。在块604的处理期间,将从用户信道分布寄存器608中检索天线#1和#2中的每个天线的天线信道特性数据。如上所述,在图5中示出了示例性的信道特性数据。根据该信道特性数据,结合图2中所示并且从数据块606检索的可用子信道信息,在块610中选择用于移动用户122的新信道。
根据相应的图5和图2中的示例性信道特性数据和子信道分配数据,天线#2的子信道3应该被分配给移动用户122,其表示具有最高增益的可用信道(例如,具有最佳信道特性的可用信道)。在一个实施例中,这可以以下面的方式确定。首先,针对每个天线资源选择具有最高增益的信道。在该示例中,这对应于天线#1的信道1和天线#2的子信道3。接着,确定该子信道是否可用。对于天线#1的子信道1,该子信道已经分配,因此其不可用。接着针对天线#1选择对应于下一个最佳增益的信道,其对应于子信道5。同样,针对信道2进行类似的确定。在该示例中,子信道3是可用的,其表示天线#2的具有最高增益的子信道。接着比较天线#1的子信道5的增益和天线#2的子信道3的增益。接着选择具有最高增益的子信道/天线组合资源分配给新用户。这导致选择天线#2的子信道3作为新信道分配给移动用户122。
有时,处理逻辑可以通过重复以上参考图6描述的过程来执行信道重新分配。这个信道重新分配补偿用户移动和干扰的任何变化。在一个实施例中,每个用户报告其信道特性数据。基站然后执行子信道和天线资源的选择性重新分配。即,在一个实施例中,一些用户可以重新分配给新的信道,而其它信道分配将保持跟以前一样。在一个实施例中,由基站发起重新训练(retraining),并且在该情况下,基站请求一个或多个特定用户报告其更新的信道特性数据。当用户观察到信道恶化时,也可以由用户提交信道重新分配请求。
图7是通过OFDMA和空间复用来与多个用户通信的基站700的框图。基站700包括:接收天线阵列702;接收机模块703,其包括耦合到接收天线阵列700的一组向下变频器704和OFDM解调器706;信道特性模块708;现行业务寄存器(ongoing traffic register)710;OFDMA子信道信道分配逻辑712;用户信道分布寄存器608;OFDMA媒体接入控制器(MAC)714;OFDM调制解调器716;信标信号发生器;OFDMA发射机模块718,其包括子信道形成块720和一组向发射天线阵列724中的相应天线资源提供输入的向上变频器722。
上行信号,包括来自请求用户的接入信号,由接收天线阵列702接收并且由向下变频器704向下变频到基带。该基带信号由OFDM解调器706解调,并且还由信道特性块708处理,以便利用上述技术之一或其它公知的信号质量估计算法来估计接入用户的上行信道特性。所估计或测量的信道特性数据,与存储在用户信道分布寄存器608中、与分配给现行业务的信道相对应的信道特性以及存储在现行业务寄存器710中的现行业务信息一起,被馈送到OFDMA子信道分配逻辑712以确定针对接入用户并且可能针对部分或全部正在进行业务的用户的信道分配。结果被发送到控制总体业务的OFDMA MAC 714。
来自OFDMA MAC 714的控制信号和下行数据流726由OFDM调制器716混合并调制以便进行下行链路传输。子信道形成(如以下参考图8描述的天线波束形成/切换操作)由子信道形成块720使用存储在用户信道分布寄存器608中的子信道限定信息来执行。子信道形成块720的输出由向上变频器组722向上变频,并且通过发射天线阵列724发射。
信标信号发生器717用于产生适合于基础传输方案的信标信号。例如,对于OFDMA传输方案,信标信号发生器717产生这样的信号,其包括插在测试数据帧之间的OFDMA导频符号。
图8中示出了与用于具有N个天线的基站的OFDMA发射机模块800的一个实施例相对应的功能块的细节。MAC动态信道分配块802用于针对P个用户中的每个用户选择适当的天线资源和子信道,如调制解调器和子信道分配块8041-P的选择输入所示。基于针对每个用户的调制解调器和子信道分配,使用OFDMA传输领域中熟知的信号处理技术,产生对应的OFDMA基带信号、将其向上变频并且通过适当的天线发射。所述过程由快速傅立叶变换(FFT)块804I-N、并串(P/S)转换块806I-N和添加周期前缀(CP)块804I-N描述。
OFDMA发射机模块800通过调节FFT输入来执行天线切换操作。例如,对于给定的用户信道,某些FFT输入设置成1(意思是使用),而其它FFT输入设置成0(意思是忽略)。OFDMA发射机模块800还支持通过借助多个天线同时发送信号来支持的信道。
通常,由本文附图中示出并且在上面描述的过程和功能块所执行的操作是通过处理逻辑来执行的,所述处理逻辑可以包括硬件(电路,专用逻辑等)、软件(如运行在通用计算机系统或专用机器上的软件)、或两者的结合。
鉴于对本领域技术人员来说,在阅读以上说明后,本发明的许多变化和修改无疑将变得明显,应当理解,通过举例说明所示出和描述的任何特定实施例不能被认为是限制。因此,对各个实施例的细节的引用并非旨在限制权利要求的范围,权利要求本身仅列举本发明的必要特征。
Claims (14)
1.一种用于无线通信的方法,所述方法包括:
在用户站处测量由位于基站处的第一天线资源和第二天线资源支持的多个正交频分多址(OFDMA)子载波的一个或多个信道特性,其中所述一个或多个信道特性指示所述多个OFDMA子载波中的对应OFDMA子载波的接收质量,并且其中所述第一天线资源和所述第二天线资源包括多个天线;
把对应于测量的所述一个或多个信道特性的数据从所述用户站发送到所述基站;
在所述用户站处接收所述多个OFDMA子载波中的一个或多个OFDMA子载波的分配的通知,其中所述分配至少基于所述第一天线资源和所述第二天线资源的所述测量的所述一个或多个信道特性,并且其中所述分配的所述多个OFDMA子载波中的至少一个OFDMA子载波不同于所述第一天线资源和所述第二天线资源;
通过周期性地在所述用户站处测量由所述基站的所述第一天线资源和所述第二天线资源支持的所述多个OFDMA子载波的所述一个或多个信道特性,来周期性地更新所述测量的所述一个或多个信道特性;
把对应于周期性地测量的所述一个或多个信道特性的更新数据周期性地从所述用户站发送到所述基站;以及
接收所述多个OFDMA子载波中的一个或多个被重新分配的OFDMA子载波的重新分配的通知,其中所述重新分配至少基于所述第一天线资源和所述第二天线资源的更新的所述测量的所述一个或多个信道特性。
2.根据权利要求1所述的方法,其中所述测量包括:
在所述用户站处从所述基站接收一个或多个信标信号;以及
在所述用户站处调谐接收单元以遍历与所述一个或多个信标信号相关的所述多个OFDMA子载波,同时测量相关的信道特性。
3.根据权利要求2所述的方法,其中所述测量所述一个或多个信道特性还包括:
通过使用来自导频符号周期和数据周期中的信息来估计信道响应和干扰。
4.根据权利要求1所述的方法,其中所述一个或多个信道特性包括信号与干扰加噪声比(SINR)、载波与干扰加噪声比(CINR)和相对信号强度指示(RSSI)测量中的至少一个。
5.根据权利要求1所述的方法,其中所述多个OFDMA子载波包括上行信道、下行信道和双向信道中的至少一个。
6.根据权利要求1所述的方法,还包括:
使所述用户站与所述基站同步;
把测试数据从所述用户站传送至所述第一天线资源;以及
在所述基站处测量由所述第一天线资源支持的所述多个OFDMA子载波中的至少一个上行OFDMA子载波的上行信道特性。
7.一种用于无线通信的方法,所述方法包括:
使用户站与基站同步;
把测试数据从所述用户站传送至所述基站的第一天线资源和第二天线资源,其中在所述基站处测量对应于所述第一天线资源和所述第二天线资源的多个正交频分多址(OFDMA)子载波的一个或多个上行信道特性,其中所述一个或多个上行信道特性指示所述多个OFDMA子载波中的对应OFDMA子载波的接收质量,并且其中所述第一天线资源和所述第二天线资源包括多个天线;
在所述用户站处接收所述多个OFDMA子载波中的一个或多个OFDMA子载波的分配的通知,其中所述分配至少基于所述第一天线资源和所述第二天线资源的所述一个或多个上行信道特性,并且其中所述分配的所述多个OFDMA子载波中的至少一个OFDMA子载波不同于所述第一天线资源和所述第二天线资源;以及
把对应于所述一个或多个上行信道特性的数据从所述用户站发送到所述基站。
8.一种用于无线通信的用户站,所述用户站包括:
控制器,其被配置成:
测量由位于基站处的第一天线资源和第二天线资源支持的多个正交频分多址(OFDMA)子载波的一个或多个信道特性,其中所述一个或多个信道特性指示所述多个OFDMA子载波中的对应OFDMA子载波的接收质量,并且其中所述第一天线资源和所述第二天线资源包括多个天线;以及
通过周期性地测量由所述基站的所述第一天线资源和所述第二天线资源支持的所述多个OFDMA子载波的所述一个或多个信道特性,来周期性地更新所述测量的所述一个或多个信道特性;
以及
收发器,其被配置成:
把对应于测量的所述一个或多个信道特性的数据发送到所述基站;
接收所述多个OFDMA子载波中的一个或多个OFDMA子载波的分配的通知,其中所述分配至少基于所述第一天线资源和所述第二天线资源的所述测量的所述一个或多个信道特性,并且其中所述分配的所述多个OFDMA子载波中的至少一个OFDMA子载波不同于所述第一天线资源和所述第二天线资源;
把对应于周期性地测量的所述一个或多个信道特性的更新数据周期性地发送到所述基站;以及
接收所述多个OFDMA子载波中的一个或多个被重新分配的OFDMA子载波的重新分配的通知,其中所述重新分配至少基于所述第一天线资源和所述第二天线资源的更新的所述测量的所述一个或多个信道特性。
9.根据权利要求8所述的用户站,还包括:
接收单元,其被配置成遍历与从所述基站接收的一个或多个信标信号相关的所述多个OFDMA子载波的OFDMA子载波,同时测量与所述一个或多个信标信号相关的所述多个OFDMA子载波的相关的信道特性。
10.根据权利要求9所述的用户站,其中所述控制器被进一步配置成:
通过使用来自导频符号周期和数据周期中的信息来估计信道响应和干扰。
11.根据权利要求8所述的用户站,其中,所述一个或多个信道特性包括信号与干扰加噪声比(SINR)、载波与干扰加噪声比(CINR)和相对信号强度指示(RSSI)测量中的至少一个。
12.根据权利要求8所述的用户站,其中所述多个OFDMA子载波包括上行信道、下行信道和双向信道中的至少一个。
13.根据权利要求8所述用户站,其中所述控制器被进一步配置成与所述基站同步;并且其中所述收发器被进一步配置成把测试数据发送至所述第一天线资源,其中在所述基站处测量由所述第一天线资源支持的所述多个OFDMA子载波中的至少一个OFDMA子载波的对应上行信道特性。
14.一种用于无线通信的用户站,所述用户站被配置成:
与基站进行同步;
把测试数据传送至所述基站的第一天线资源和第二天线资源,其中在所述基站处测量对应于所述第一天线资源和所述第二天线资源的多个正交频分多址(OFDMA)子载波的一个或多个上行信道特性,其中所述一个或多个上行信道特性指示所述多个OFDMA子载波中的对应OFDMA子载波的接收质量,并且其中所述第一天线资源和所述第二天线资源包括多个天线;
接收所述多个OFDMA子载波中的一个或多个OFDMA子载波的分配的通知,其中所述分配至少基于所述第一天线资源和所述第二天线资源的所述一个或多个上行信道特性,其中所述分配的所述多个OFDMA子载波中的至少一个OFDMA子载波不同于所述第一天线资源和所述第二天线资源;以及
把对应于所述一个或多个上行信道特性的数据发送到所述基站。
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN112514433A (zh) * | 2018-08-09 | 2021-03-16 | 索尼公司 | 通信设备、通信控制方法和记录介质 |
CN112514433B (zh) * | 2018-08-09 | 2024-04-26 | 索尼公司 | 通信设备、通信控制方法和记录介质 |
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WO2006062994A3 (en) | 2007-03-22 |
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TW200642336A (en) | 2006-12-01 |
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JP4927755B2 (ja) | 2012-05-09 |
US20140328276A1 (en) | 2014-11-06 |
CN102946265B (zh) | 2015-09-09 |
US7573851B2 (en) | 2009-08-11 |
CN101073206B (zh) | 2012-12-26 |
KR101214392B1 (ko) | 2012-12-21 |
CA2586315C (en) | 2014-06-10 |
TWI374624B (en) | 2012-10-11 |
EP1829225A2 (en) | 2007-09-05 |
JP2008523664A (ja) | 2008-07-03 |
US20090274059A1 (en) | 2009-11-05 |
IL183286A (en) | 2011-08-31 |
MX2007006648A (es) | 2007-08-02 |
CA2586315A1 (en) | 2006-06-15 |
WO2006062994A2 (en) | 2006-06-15 |
US8760992B2 (en) | 2014-06-24 |
KR20070098853A (ko) | 2007-10-05 |
US20060120395A1 (en) | 2006-06-08 |
AU2005314171B2 (en) | 2010-07-15 |
CN101073206A (zh) | 2007-11-14 |
US8797970B2 (en) | 2014-08-05 |
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