CN105706407A - 使用针对ofdma hew的各个音调分配的最小带宽单元进行通信的通信站和方法 - Google Patents
使用针对ofdma hew的各个音调分配的最小带宽单元进行通信的通信站和方法 Download PDFInfo
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Abstract
在此总体上描述一种用于在无线网络中进行通信的通信站和方法的实施例。在一些实施例中,通信站可以被配置为:在控制时段期间,根据正交频分多址(OFDMA)技术在信道资源上传递正交频分复用(OFDM)符号。信道资源可以包括一个或多个最小带宽单元。每个最小带宽单元可以具有预定带宽,并且可以根据用于多个交织器配置之一的多个子载波分配之一进行配置。
Description
优先权要求
该申请要求以下美国临时专利申请的优先权的利益:
2013年11月19日提交的序列号No.61/906,059,
2014年4月1日提交的序列号No.61/973,376,
2014年4月8日提交的序列号No.61/976,951,
2014年4月30日提交的序列号No.61/986,256,
2014年4月30日提交的序列号No.61/986,250,
2014年5月12日提交的序列号No.61/991,730,
2014年6月18日提交的序列号No.62/013,869,以及
2014年7月15日提交的序列号No.62/024,801,
其全部通过引用整体合并于此。
技术领域
实施例涉及无线网络。一些实施例涉及包括根据IEEE802.11标准族(例如IEEE802.11ac标准或IEEE802.11axSIG(名为DensiFi))操作的网络的无线局域网(WLAN)和Wi-Fi网络。一些实施例涉及高效率无线或高效率WLAN(HEW)通信。
背景技术
无线通信已经朝向日益增加的数据率演进(例如,从IEEE802.11a/g到IEEE802.11n,再到IEEE802.11ac)。在高密度部署情形中,总体***效率可能变得比较高数据率更重要。例如,在高密度热点和蜂窝卸载情形中,竞争无线介质的很多设备可能具有低至中等数据率要求(相对于IEEE802.11ac的非常高的数据率)。用于包括非常高吞吐量(VHT)通信的传统和遗留IEEE802.11通信的帧结构对于这些高密度部署情形可能是较不合适的。近来形成的针对Wi-Fi演进(即IEEE802.11ax)的研究组(称为IEEE802.11高效率WLAN(HEW)研究组(SG))正解决这些高密度部署情形。HEW的一个问题是定义能够重新使用至少一些802.11ac硬件(例如,块交织器)的高效通信结构。
因此,普遍需要一种改进无线网络(尤其是针对高密度部署情形)中的总体***效率的设备和方法。还普遍需要适合于HEW通信的设备和方法。还普遍需要适合于根据能够重新使用至少一些传统硬件的高效通信结构的HEW通信的设备和方法。
附图说明
图1示出根据一些实施例的HEW网络;
图2是根据一些实施例的HEW通信站的物理层框图;
图3示出根据一些实施例的HEW设备;以及
图4是根据一些实施例的用于使用最小带宽单元进行通信的过程。
具体实施方式
以下描述和附图充分示出特定实施例以使得本领域技术人员能够实践它们。其它实施例可以包括结构改变、逻辑改变、电改变、处理改变和其它改变。一些实施例的部分或特征可以包括于或替代以其它实施例的部分和特征。权利要求中所阐述的实施例囊括这些权利要求的所有可用等同物。
在此所公开的一些实施例提供用于HEW网络中的音调分配的***和方法。在一些实施例中,主站可以为HEW分配音调,以提供最小正交频分多址(OFDMA)带宽单元(即最小带宽单元)。在一些实施例中,HEW通信站可以被配置为:在包括一个或多个最小带宽单元的信道资源上传递正交频分复用(OFDM)符号。每个最小带宽单元可以具有预定带宽,并且最小带宽单元可以根据用于多个交织器配置之一的多个子载波(即音调)分配之一进行配置。在一些实施例中,提供最优的子载波分配和交织器大小组合,以便与OFDMA最小带宽单元一起使用。以下更详细地讨论这些实施例。
图1示出根据一些实施例的HEW网络。HEW网络100可以包括主站(STA)102、多个HEW站104(HEW设备)以及多个遗留站106(遗留设备)。主站102可以被布置为:根据IEEE802.11标准中的一个或多个与HEW站104和遗留站106进行通信。根据一些HEW实施例,主站102可以被布置为:(例如,在竞争时段期间)竞争无线介质,以接收介质的独占控制达HEW控制时段(即传输机会(TXOP))。主站102可以例如在HEW控制时段的开始时发送主同步或控制传输,以指示哪些HEW站104被调度在HEW控制时段期间进行通信等。在HEW控制时段期间,受调度的HEW站104可以根据基于非竞争的多址技术来与主站102进行通信。这不同于设备根据基于竞争的通信技术而非基于非竞争的多址技术进行通信的传统Wi-Fi通信。在HEW控制时段期间,主站102可以(例如使用一个或多个HEW帧)与HEW设备104进行通信。在HEW控制时段期间,遗留站106可以抑制通信。在一些实施例中,主同步传输可以称为控制和调度传输。
在一些实施例中,在HEW控制时段期间所使用的多址技术可以是受调度的正交频分多址(OFDMA)技术,但这并非要求。在一些实施例中,多址技术可以是时分多址(TDMA)技术或频分多址(FDMA)技术。在一些实施例中,多址技术可以是包括多用户(MU)多入多出(MIMO)(MU-MIMO)技术的空分多址(SDMA)技术。在HEW控制时段期间所使用的这些多址技术可以被配置用于上行链路或下行链路数据通信。
主站102也可以(在控制时段之外)根据遗留IEEE802.11通信技术与遗留站106进行通信。在一些实施例中,主站102也可配置为:根据遗留IEEE802.11通信技术在HEW控制时段之外与HEW站104进行通信,但这并非要求。
在一些实施例中,在控制时段期间的HEW通信可配置为:具有20MHz、40MHz或80MHz连续的(contiguous)带宽或80+80MHz(160MHz)非连续的带宽之一的带宽。在一些实施例中,可以使用320MHz信道带宽。在一些实施例中,也可以使用小于20MHz的子信道带宽。在这些实施例中,HEW通信的每个信道或子信道可以被配置用于发送多个空间流。在控制时段期间的HEW通信可以是上行链路或下行链路通信。
根据实施例,HEW通信站104可以被配置为:在控制时段期间根据OFDMA技术在信道资源上传递OFDM符号。信道资源可以包括一个或多个最小带宽单元,并且每个最小带宽单元可以具有预定带宽。可以根据用于多个交织器配置之一的多个子载波分配之一来配置最小带宽单元。
在一些实施例中,多个20MHz信道中的每一个可配置为包括两个或更多个最小带宽单元,并且可配置用于20MHz、40MHz、80MHz和160MHz(80+80)带宽操作。用于最小带宽单元的子载波分配可以包括包含多个数据子载波和多个导频子载波的预定数目的子载波。
如以下更详细地讨论的那样,HEW站104可以包括物理层(PHY)和介质访问控制(MAC)层电路。在一些实施例中,PHY电路可以包括具有一个OFDM符号的深度的块交织器。块交织器可配置为:根据多个交织器配置之一对已编码数据块进行交织。交织器配置可以包括多列和多行。
图2是根据一些实施例的HEW通信站的物理层框图。如图2所示,HEW通信站104的PHY层电路200可以包括一个或多个编码器208、一个或多个块交织器214以及一个或多个星座映射器216等。编码器208中的每一个可以被配置为:在由交织器214进行交织之前,对输入数据进行编码。星座映射器216中的每一个可以被配置为:在交织之后将所交织的数据映射到星座(例如QAM星座)。每个交织器214可以被配置为:根据多个交织器配置之一对已编码数据块进行交织。在一些实施例中,编码器208可以是二进制卷积码(BCC)编码器。
根据实施例,编码器208和映射器216根据用于特定子载波分配(即音调分配)的多个预定调制和编码方案(MCS)组合之一进行操作。用于子载波分配的多个预定MCS组合可能受限于每OFDM符号的已编码比特的整数数目(Ncbps)和每OFDM符号的数据比特的整数数目(Ndbps)。在这些实施例中,每OFDM符号的已编码比特的数目(Ncbps)是整数数目,每OFDM符号的数据比特的数目(Ndbps)是整数数目。倘若Ncbps和Ndbps都是整数,那么可以使用的预定MCS组合和子载波分配可以包括BPSK、QPSK、16-QAM、64-QAM和256-QAM的调制阶以及1/2、3/4、2/3和5/6的编码速率。非整数Ndbps可能导致填充比特是非整数数目,或者已编码比特的数目超过OFDM符号的数目,这可能导致最少一个附加OFDM符号仅包括填充比特。整数Ndbps可以确保所有数据长度使用802.112012规范中的11n“NumberofOFDMSymbols”公式(20-32)工作,而没有附加填充。因此,在此所公开的实施例可以受限特定MCS组合和子载波分配。在这些实施例中,交织器硬件架构配置处于允许对于HEW重新使用遗留802.11硬件块的IEEE802.11交织器的边界内。
在这些实施例中,在交织之前,通信站被配置为基于编码速率对输入数据进行编码,并且在交织之后,通信站可以被配置为基于调制等级将所交织的比特星座映射到QAM星座点。编码速率和调制等级可以根据用于特定子载波分配的预定MCS组合之一。以下更详细地描述这些实施例。
在一些实施例中,最小带宽单元可以具有十四(14)个子载波。在这些实施例中,子载波分配可以包括十二(12)个数据子载波和两(2)个导频子载波,并且对应的交织器配置(即大小)可以具有六(6)个列(NCol)以及等于每单个子载波的已编码比特的数目(NBPSCS)的两(2)(y=2)倍的行数目(Nrow)。在这些实施例中,块交织器214可以看作6x2块交织器。在最小带宽单元具有14个子载波的这些实施例中,64点FFT可以用于处理,但实施例的范围不限于此。
在一些实施例中,对于具有十四(14)个子载波的最小带宽单元,子载波分配可以包括十三(13)个数据子载波以及一(1)个导频子载波,并且对应的交织器配置(即大小)可以具有六(6)个列(NCol)以及等于每单个子载波的已编码比特的数目(NBPSCS)的两(2)(y=2)倍的行数目(Nrow)。在这些实施例中,块交织器214可以看作6x2块交织器。在最小带宽单元具有14个子载波的这些实施例中,64点FFT可以用于处理,但实施例的范围不限于此。
在一些实施例中,最小带宽单元可以具有二十八(28)个子载波。在这些实施例中,子载波分配可以包括二十四(24)个数据子载波和四(4)个导频子载波,并且对应的交织器配置(即大小)可以具有八(8)个列(NCol)以及等于每单个子载波的已编码比特的数目(NBPSCS)的三(3)(y=3)倍的行数目(Nrow)。在这些实施例中,块交织器214可以看作8x3块交织器。在最小带宽单元具有28个子载波的这些实施例中,128点FFT或256点FFT可以用于处理,但实施例的范围不限于此。
在这些实施例中,对于具有二十八(28)个子载波的最小带宽单元,子载波分配可以包括二十六(26)个数据子载波和两(2)个导频子载波,并且对应的交织器配置可以包括十三(13)个列(NCol)以及等于每单个子载波的已编码比特的数目(NBPSCS)的两(2)(y=2)倍的行数目(Nrow)。在这些实施例中,块交织器可以看作13x2块交织器。在最小带宽单元具有28个子载波的这些实施例中,128点FFT或256点FFT可以用于处理,但实施例的范围不限于此。
在一些实施例中,最小带宽单元可以具有五十六(56)个子载波。在这些实施例中,子载波分配可以包括五十二(52)个数据子载波和四(4)个导频子载波或者四十八(48)个数据子载波和八(8)个导频子载波。在这些实施例中,对应的交织器配置可以包括二十六(26)个列(NCol)和等于每单个子载波的已编码比特的数目(NBPSCS)的两(2)(y=2)倍的行数目(Nrow),但也可以使用其它交织器配置。
在一些实施例中,当在20MHz带宽上以(4x)256点FFT来处理56个子载波最小带宽单元时,各子载波之间的间隔减少1/4(即,与在20MHz带宽中使用64点FFT相比)。类似地,当在20MHz带宽上以(4x)256点FFT来处理28个子载波最小带宽单元时,各子载波之间的间隔减少1/4(即,与在20MHz带宽中使用64点FFT相比)。当在20MHz带宽上以(2x)128点FFT来处理56个子载波最小带宽单元时,各子载波之间的间隔减少1/2(即,与在20MHz带宽中使用64点FFT相比)。类似地,当在20MHz带宽上以(2x)256点FFT来处理28个子载波最小带宽单元时,各子载波之间的间隔减少1/2(即,与在20MHz带宽中使用64点FFT相比)。
在一些实施例中,HEW站104的处理电路可以基于交织器配置之一来配置块交织器214。在一些实施例中,交织器214可以被配置为按每最小带宽单元进行交织。在这些实施例中,可以单独地交织用于每个单个最小带宽单元的已编码比特。在其它实施例中,可以一起交织用于多于一个的最小带宽单元的已编码比特。
在一些实施例中,交织器214被配置为按2X最小带宽单元进行交织。在这些实施例中,可以一起交织用于两个最小带宽单元的已编码比特(即,以提供改进的性能),但实施例的范围不限于此。
在一些实施例中,对于具有二十八(28)个子载波的最小带宽单元,可以用2xFFT大小(即128点FFT而非64点FFT)来处理28个子载波,但这并非要求,因为也可以用64点FFT来处理具有二十八(28)个子载波的最小带宽单元。在这些实施例中,可以使用较长OFDM符号持续时间(4x),但这并非要求。这些实施例可以适合于较大延迟扩展情形(例如室外信道),但实施例的范围不限于此。在一些实施例中,128点FFT可以用于处理小尺寸最小带宽单元(例如两个14个子载波最小带宽单元)。
在一些实施例中,对于具有二十八(28)个子载波的最小带宽单元,可以用4xFFT大小(即256点FFT而非64点FFT)来处理28个子载波,但这并非要求,因为也可以用64点FFT来处理具有二十八(28)个子载波的最小带宽单元。在这些实施例中,可以使用较长OFDM符号持续时间(4x),但这并非要求。这些实施例可以适合于较大延迟扩展情形(例如室外信道),但实施例的范围不限于此。在一些实施例中,256点FFT可以用于处理小尺寸最小带宽单元(例如两个14个子载波最小带宽单元)。
在一些实施例中,对于具有五十六(56)个子载波的最小带宽单元,可以用4xFFT大小(即256点FFT而非64点FFT)来处理56个子载波,但这并非要求,因为也可以用64点FFT或128点FFT来处理最小带宽单元。在这些实施例中,可以使用较长OFDM符号持续时间(例如4x),但这并非要求。这些实施例也可以适合于较大延迟扩展情形(例如室外信道),但实施例的范围不限于此。
在一些实施例中,每个最小带宽单元可配置用于一至四个空间流之间的通信。在这些实施例中,在控制时段期间可以使用上行链路SDMA或上行链路MIMO技术,以传递空间流。在这些实施例中,在控制时段期间可以替代地使用下行链路SDMA或下行链路MIMO技术,以传递空间流。
在此所公开的实施例提供数据子载波的数目、导频子载波的数目以及块交织器的大小,以用于二进制卷积码(BCC)编码的情况。在一些实施例中,美国临时专利申请序列号No.61/976,951中所描述的用于802.11ax的OFDMA波形的结构可以适合于使用,但这并非要求。在此所公开的一些实施例描述用于OFDMA波形的最小带宽单元,并且描述子载波分配的架构。在一些实施例中,子载波分配可以被配置为重新使用IEEE802.11ac硬件来生成新的OFDMA结构。如在此所描述,在一些实施例中,可以使用14个子载波的OFDMA的最小单元。在一些其它实施例中,这些单元中的两个可以组合,以生成28个子载波的较大最小带宽单元。在一些实施例中,四个14个载波最小带宽单元可以组合,以提供56个子载波最小带宽单元。
为了基于信道模型来确定用于块交织器的最佳配置,关于MCS和其它参数执行了***仿真。执行了边界内的穷举(exhaustive)搜索以达到合理的子载波分配,并且选择了优选子载波分配。
一些实施例可以在很大程度上重新使用一些现有***参数和***块。通过重新使用现有***块,使得演进不复杂且不昂贵。在此所描述的一些实施例通过关于较窄带宽的扩展而重新使用当前所定义的交织器结构。在此所描述的一些实施例重新使用当前码速率并且提供根据需要修改速率的能力。在此所描述的一些实施例通过根据需要修改调制大小的能力来重新使用当前调制类型。一些实施例包括在上述约束下更有用的子载波分配。
在此所描述的实施例将可能的分配概括为以下组中的每一个:数据子载波、导频子载波以及块交织器的大小。在OFDMA***中,最小带宽单元中所使用的子载波的总数目可以是***设计参数。根据该总子载波计数,OFDMA***可以具有分配给数据、分配给导频(例如用于时间/频率和信道跟踪)、分配给保护(例如,以符合频谱掩蔽)的子载波以及在DC处和DC周围(例如,以简化直接变频接收机设计)的子载波。例如,在20MHzIEEE802.11ac网络中,固定子载波间隔是312.5kHz,子载波的总数目是64。在这64个子载波中,52个用于数据,1个用于DC(假设空白),4个用于导频,其余7个用于保护(假设空白)。
通过引用合并于此的US61/976,951描述了一种用于64点FFT大小的14个子载波的最小带宽单元(即最小OFDMA带宽单元)。两个这样的最小带宽单元可以组合,以提供具有28个子载波的较宽带宽最小带宽单元。替换地,28个子载波最小带宽单元可以提供作为用于2xFFT大小的最小OFDMA,以帮助克服较大延迟扩展(例如,对于室外信道)。基本调制类型集合可以包括BPSK、QPSK、16-QAM、64QAM和256QAM。
在此所公开的实施例可以基于该调制集合来提供子载波分配。所利用的码速率可以选自以下集合r={1/2,3/4,2/3和5/6}。该集合中的所***速率并非用于所有调制类型,但其确实包括整个调制集合上所使用的所有当前速率。为了确定有效子载波分配,可以使用与先前***(例如IEEE802.11a/11n/11ac***)中进行的相同的调制和编码分配。如上所述,一些实施例可以利用来自传统IEEE802.11***的现有信道交织器。在IEEEStd.802.11ac--2013“IEEEStandardforInformationTechnology-Telecommunicationsandinformationexchangebetweensystems-Localandmetropolitanareanetworks-Part11:WirelessLANMediumAccessControl(MAC)andPhysicalLayer(PHY)specifications,Amendment4:EnhancementsforVeryHighThroughputforOperationinBandsbelow6GHz”的章节22.3.10.8中定义了信道交织器。在该原文中,在表22-17“NumberofRowsandcolumnsintheinterleaver”中概述了交织器参数。对于一至四个空间流的情况,为了完整性,在此创建表。
在802.11n中,通过修改为读写数据定义的矩阵大小来重新使用的现有交织器算法,从而完成40MHz的引入。于是在802.11ac中,通过引入80MHz,再次利用同一交织器算法。这些参数定义交织器中所存储的已编码符号的数目。在此所公开的一些实施例可以通过定义用于OFDMA最小带宽单元的NCOL和NROW的新值来重新使用现有的交织器算法。上表中的NROT操作定义当多于一个的空间流存在时的值的轮流,而不是定义交织器大小,并且不影响子载波分配。
关于NCOL和NROW的交织器配置可以基于***仿真。在上表中可见,NROW是每流的每子载波的已编码比特的数目(NBPSCS)的恒定倍数。因此,交织器物理大小是MCS的函数。在此所公开的实施例定义计算NROW时使用的常数(y)。发明人已经在边界内完成穷举搜索,以在上述目标约束下达到合理的子载波分配。在此所公开的实施例使用上述约束为很多交织器结构提供解决方案。
使用上述约束,可以实现子载波分配集合。在利用14个数据子载波分配作为最小带宽单元的示例实施例中,对于数据子载波关于从10到14个子载波的任何地方执行搜索,接着这将分别针对4个用户允许从4到0个导频子载波。在这些实施例中,具有十四(14)个子载波的最小带宽单元可以允许四个用户在使用56个子载波的传统IEEE802.1120MHz通信信道内同时进行通信。在这些实施例中的一些中,每个用户将使用正交最小带宽单元(即,具有14个子载波的不同集合)根据OFDMA技术进行通信。
为了基于上述约束来确定配置是否为可能的,可以使用一组公式。为了清楚,以下定义一组变量。
因此,如果M1&M2=0,则使用该码速率和调制的配置是可允许的,否则是不允许的。脚本可以用于找到可允许的组合。可以初始地假设所有调制能够被支持(例如,对于40MHz如IEEE802.11ac中那样),包括具***速率3/4和5/6的(802.11ac中所引入的)64QAM和256QAM。接下来是针对14个子载波的其它情况。对于这种第一假设,所允许的分配是:
根据以上搜索结果,仅12个数据子载波(以及2个导频子载波)在支持所有MCS的当前交织器的情况下是有效的。这样带来进行选择的若干交织器尺寸。
接下来,完成相同事情,但这次,允许交织器是一维的(即,具有仅一行或一列矢量)。
该搜索结果提供更多交织器选项,但12个数据子载波(以及2个导频)是可用的(即,并非10、11或13个数据子载波)。为了完整性,上表用于确定其它子载波分配是否可能。使用一维交织器将可能执行得比二维交织器或3维交织器更差。
接下来,搜索返回到在交织器中需要至少2个行和列,但不需要支持具有256-QAM的码速率5/6(例如,在802.11ac中针对20MHz使用的同样排除)。在此情况下,有效配置是:
可见,得到与第一种情况下相同的配置,其中不存在256-QAM约束,但是现在具有10和14个子载波分配的加入是可能的。这些实施例允许使用4个导频(针对10个数据子载波情况)或0个导频(针对14个数据子载波情况)。
最后,为了完整性,不允许具有256-QAM的r=5/6,结果概述如下。在此情况下,在附加的一维交织器情况下,10个数据子载波选项和14个数据子载波选项再次是可能的。
在使用OFDMA的一些实施例中,可以使用两个基本最小带宽单元。这些包括14个数据子载波最小带宽单元以及组合了两个14个最小带宽单元的28个数据子载波最小带宽单元。对于这种带宽情况,可能更期望在全部28个子载波上而非仅在14个子载波上进行交织。因此,上述应用可以在此重复,但在此情况下,子载波是从24到28数据(分别是4到0个导频)扫描的。在该第一情况下,我们再次假设对于80MHz如.11ac中那样能够支持所有调制。搜索还允许一维交织器(忽略空间流维度),其包括具***速率3/4和5/6的64QAM和256QAM。据此,结果是:
在上表中可见,对于该情况,仅要求4个导频子载波的24个数据子载波是可能的,但存在大量交织器组合。
接下来,在该搜索中,无需支持具有256QAM的码速率5/6,在802.11ac中针对20MHz使用的同样排除。在此情况下,选项是:(允许一维交织器)。
这允许24、26和28个数据子载波(分别是4、2和0个导频子载波)。
据此可见,存在允许重新使用标准交织器算法和硬件的先前版本的解决方案。这些解决方案对于关于802.11ax提出的14和28个数据子载波OFDMA模式都起作用。据此,可以针对14和28个数据子载波的最小带宽单元选择一组优选交织器配置。对于14个子载波,一种优选交织器配置示出如下:
y | NCol | Nsd |
2 | 6 | 12 |
这些实施例为接收机参数估计和跟踪提供2个导频,这基于过去***被看作是足够的。由于NROW=y*NBPSCS,并且对于所有调制NBPSCS∈{1,2,4,6,8},因此交织器维度从用于BPSK的2x6变为用于256QAM的16x6。这可以为使交织器更接近正方形提供更好的解决方案。
对于28个子载波最小带宽单元,优选的交织器配置中的一些示出如下:
y | NCol | Nsd |
3 | 8 | 24 |
2 | 13 | 26 |
在这些实施例中,28个子载波最小带宽单元可以包括24个数据子载波和4个导频子载波或者26个数据子载波和2个导频子载波。对于28个子载波,两个导频可以是足够的,但是更多的导频子载波也是可能的。
在此所公开的一些实施例可以应用于以标准OFDM符号持续时间操作的IEEE802.11ax和HEW网络。在此所公开的一些其它实施例可以应用于以较长OFDM符号持续时间(例如,2x和4x标准符号持续时间)操作的IEEE802.11ax和HEW网络。在一些实施例中,针对较小延迟扩展环境(例如室内)可以选择标准持续时间OFDM符号,而针对较大延迟扩展环境(例如室外)可以选择较长持续时间OFDM符号。标准持续时间OFDM符号可以具有范围从包括400纳秒(ns)短保护间隔的3.6微秒(μs)到包括800ns保护间隔的4μs的符号持续时间。
图3示出根据一些实施例的HEW设备。HEW设备300可以是HEW顺应设备,其可以被布置为与一个或多个其它HEW设备(例如HEW站和/或主站)进行通信,并且与遗留设备进行通信。HEW设备300可以适合于操作为主站或HEW站。根据实施例,其中,HEW设备300可以包括物理层(PHY)电路302和介质访问控制层电路(MAC)304。PHY302和MAC304可以是HEW顺应层,并且也可以顺应于一个或多个遗留IEEE802.11标准。PHY302可以被布置为发送HEW帧。HEW设备300还可以包括被配置为执行在此所描述的各种操作的其它处理电路306和存储器308。
根据一些实施例,MAC304可以被布置为:在竞争时段期间竞争无线介质以接收介质的控制达HEW控制时段,并且配置HEW帧。PHY302可以被布置为如上所述发送HEW帧。PHY302也可以被布置为从HEW站接收HEW帧。MAC304也可以被布置为通过PHY302执行发送和接收操作。PHY302可以包括用于调制/解调、上变频/下变频、滤波、放大等的电路。在一些实施例中,处理电路306可以包括一个或多个处理器。在一些实施例中,两个或更多个天线可以耦合到物理层电路,并且被布置用于发送而且接收包括HEW帧的传输的信号。存储器308可以存储信息,以用于将处理电路306配置为执行用于配置并且发送HEW帧的操作而且执行在此所描述的各种操作。
在一些实施例中,HEW设备300可以被配置为:通过多载波通信信道使用OFDM通信信号进行通信。在一些实施例中,HEW设备300可以被配置为:根据特定通信标准(例如包括IEEE802.11-2012、802.11n-2009和/或802.11ac-2013标准的电气与电子工程师协会(IEEE)标准)和/或包括所提出的HEW标准的所提出的用于WLAN的规范接收信号,但本发明的范围不限于此,因为它们也可以适合于根据其它技术和标准发送和/或接收通信。在一些其它实施例中,HEW设备300可以被配置为:使用一种或多种其它调制技术(例如扩频调制(例如直接序列码分多址(DS-CDMA))和/或跳频码分多址(FH-CDMA)、时分复用(TDM)调制和/或频分复用(FDM)调制)接收所发送的信号,但实施例的范围不限于此。
在一些实施例中,HEW设备300可以是便携式无线通信设备(例如个人数字助理(PDA)、具有无线通信能力的膝上型或便携式计算机、web平板、无线电话或智能电话、无线耳机、寻呼机、即时传信设备、数码相机、接入点、电视、媒体设备(例如心率监测器、血压监测器等)或其它可以通过无线方式接收和/或发送信息的设备)的部分。在一些实施例中,HEW设备300可以包括键盘、显示器、非易失性存储器端口、多个天线、图形处理器、应用处理器、扬声器以及其它移动设备元件中的一个或多个。显示器可以是包括触摸屏的LCD屏幕。
HEW设备300的天线301可以包括一个或多个方向性天线或全向性天线,包括例如双极天线、单极天线、贴片天线、环路天线、微带天线或适合于传输RF信号的其它类型的天线。在一些多入多出(MIMO)实施例中,天线301可以有效地分离以利用空间分集以及可能在天线中的每一个与发送站的天线之间产生的不同信道特性。
虽然HEW设备300示出为具有若干分立功能元件,但功能元件中的一个或多个可以组合并且可以由软件配置的元件(例如包括数字信号处理器的处理元件)和/或其它硬件元件的组合实现。例如,一些元件可以包括一个或多个微处理器、DSP、现场可编程门阵列(FPGA)、专用集成电路(ASIC)、射频集成电路(RFIC)以及用于至少执行在此所描述的功能的各种硬件和逻辑电路的组合。在一些实施例中,HEW设备300功能元件可以指代一个或多个处理元件上操作的一个或多个处理。
实施例可以实现于硬件、固件和软件之一或其组合中。实施例也可以实现为计算机可读存储设备上所存储的指令,计算机可读存储设备可以由至少一个处理器读取并且执行以执行在此所描述的操作。计算机可读存储设备可以包括用于以机器可读的形式存储信息的任何非瞬时机构(例如计算机)。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。一些实施例可以包括一个或多个处理器,并且可以被配置有计算机可读存储设备上所存储的指令。
图4是根据一些实施例的用于使用最小带宽单元进行通信的过程。过程400可以由HEW设备(例如HEW站104或HEW主设备或站102)执行。
操作402包括:将块交织器配置为根据对于最小带宽单元的子载波分配所确定的多个交织器配置之一对已编码输入数据的块进行交织。
操作404包括:在控制时段期间,根据基于非竞争的通信技术在包括一个或多个最小带宽单元的信道资源上传递OFDM符号。
提供摘要以符合要求将允许读者确知技术公开的性质和主旨的摘要的37C.F.R章节1.72(b)。应理解,其将不用于限制或解释权利要求的范围或涵义。所附权利要求由此合并到具体实施方式,其中,每一权利要求自身代表单独优选实施例。
Claims (22)
1.一种通信站,包括物理层(PHY)和介质访问控制(MAC)层电路,所述通信站被配置为:
在控制时段期间,根据正交频分多址(OFDMA)技术在信道资源上传递正交频分复用(OFDM)符号,所述信道资源包括一个或多个最小带宽单元,每个最小带宽单元具有预定带宽,
其中,根据用于多个交织器配置之一的多个子载波分配之一来配置所述最小带宽单元。
2.如权利要求1所述的通信站,其中,多个20MHz信道中的每一个能够被配置为包括两个或更多个最小带宽单元,并且能够被配置用于20MHz、40MHz、80MHz和160MHz带宽操作,并且
其中,用于所述最小带宽单元的子载波分配包括预定数目的子载波,所述子载波包含多个数据子载波和多个导频子载波。
3.如权利要求2所述的通信站,其中,所述PHY电路包括具有一个OFDM符号的深度的块交织器,所述块交织器能够被配置为根据所述多个交织器配置对已编码数据块进行交织,并且
其中,所述交织器配置包括多列和多行。
4.如权利要求3所述的通信站,其中,所述通信站还包括:
编码器,被配置为在交织之前对输入数据进行编码;以及
星座映射器,用于在交织之后映射所交织的数据,
其中,所述编码器和映射器根据用于所述子载波分配的多个预定调制和编码方案(MCS)组合之一进行操作,
其中,用于所述子载波分配的所述多个预定MCS组合被限于整数数目的每OFDM符号已编码比特(Ncbps)和整数数目的每OFDM符号数据比特(Ndbps)。
5.如权利要求4所述的通信站,其中,对于具有十四个子载波的最小带宽单元,所述子载波分配包括十二个数据子载波和两个导频子载波,并且所述交织器配置包括六个列(NCol)和等于每单个子载波的已编码比特的数目(NBPSCS)的两倍数目的行(Nrow)。
6.如权利要求4所述的通信站,其中,对于具有十四个子载波的最小带宽单元,所述子载波分配包括十三个数据子载波和一个导频子载波,并且所述交织器配置包括六个列(NCol)和等于每单个子载波的已编码比特的数目(NBPSCS)的两倍数目的行(Nrow)。
7.如权利要求4所述的通信站,其中,对于具有二十八个子载波的最小带宽单元,所述子载波分配包括二十四个数据子载波和四个导频子载波,并且对应的交织器配置包括八个列(NCol)和等于每单个子载波的已编码比特的数目(NBPSCS)的三倍数目的行(Nrow)。
8.如权利要求4所述的通信站,其中,对于具有二十八个子载波的最小带宽单元,所述子载波分配包括二十六个数据子载波和两个导频子载波,并且对应的交织器配置包括十三个列(NCol)和等于每单个子载波的已编码比特的数目(NBPSCS)的两倍数目的行(Nrow)。
9.如权利要求4所述的通信站,其中,对于具有五十六个子载波的最小带宽单元:所述子载波分配包括以下之一:
五十二个数据子载波和四个导频子载波;以及
四十八个数据子载波和八个导频子载波。
10.如权利要求4所述的通信站,其中,所述交织器由处理电路配置为:按每最小带宽单元对已编码的输入数据进行交织。
11.如权利要求4所述的通信站,其中,所述交织器由处理电路配置为:按2X最小带宽单元对已编码的输入数据进行交织。
12.如权利要求4所述的通信站,其中,对于具有二十八个子载波的最小带宽单元,以2xFFT大小来处理所述二十八个子载波。
13.如权利要求4所述的通信站,其中,对于具有二十八个子载波的最小带宽单元,以4xFFT大小来处理所述二十八个子载波。
14.如权利要求4所述的通信站,其中,对于具有五十六个子载波的最小带宽单元,以4xFFT大小来处理所述五十六个子载波。
15.如权利要求14所述的通信站,其中,当以4xFFT大小来处理最小带宽单元的子载波时,各子载波之间的间隔被减少1/4,并且
其中,当以2xFFT大小来处理最小带宽单元的子载波时,各子载波之间的间隔被减少1/2。
16.如权利要求1所述的通信站,其中,所述通信站是高效率WLAN(HEW)接入点,所述接入点被配置成操作为主站,并且被配置为:
在竞争时段期间竞争无线介质,以接收所述介质的控制持续控制时段;以及
在所述控制时段期间,与受调度的HEW设备传递OFDM符号,其中,在所述控制时段期间,所述主站独占使用所述无线介质,以便根据OFDMA技术与受调度的HEW站进行通信。
17.如权利要求1所述的通信站,其中,所述通信站是高效率WLAN(HEW)设备,被配置为:在所述控制时段期间与HEW主站进行通信。
18.一种由通信站在IEEE802.11网络中进行通信的方法,所述方法包括:
在控制时段期间,根据正交频分多址(OFDMA)技术在信道资源上传递正交频分复用(OFDM)符号,所述信道资源包括一个或多个最小带宽单元,每个最小带宽单元具有预定带宽,
其中,根据用于多个交织器配置之一的多个子载波分配之一来配置所述最小带宽单元。
19.如权利要求18所述的方法,其中,多个20MHz信道中的每一个能够被配置为包括两个或更多个最小带宽单元,并且能够被配置用于20MHz、40MHz、80MHz和160MHz带宽操作,并且
其中,用于所述最小带宽单元的子载波分配包括预定数目的子载波,所述子载波包含多个数据子载波和多个导频子载波,并且
其中,所述方法还包括:将块交织器配置为根据所述交织器配置之一对已编码的输入数据块进行交织。
20.如权利要求19所述的方法,其中,所述交织器配置包括多列和多行,并且
其中,所述方法还包括:
在交织之前对输入数据进行编码;以及
在交织之后映射所交织的数据,
其中,所述编码和映射根据用于所述子载波分配的多个预定调制和编码方案(MCS)组合之一进行操作,
其中,用于所述子载波分配的所述多个预定MCS组合被限于整数数目的每OFDM符号已编码比特(Ncbps)和整数数目的每OFDM符号数据比特(Ndbps)。
21.一种存储有指令的非瞬时计算机可读存储介质,所述指令由一个或多个处理器执行以执行操作,从而将通信站配置为:
在控制时段期间,根据基于非竞争的通信技术在信道资源上传递正交频分复用(OFDM)符号,所述信道资源包括一个或多个最小带宽单元,每个最小带宽单元具有预定带宽,
其中,根据用于多个交织器配置之一的多个子载波分配之一来配置所述最小带宽单元。
22.如权利要求21所述的非瞬时计算机可读存储介质,其中,所述基于非竞争的通信技术是正交频分多址(OFDMA)技术,
其中,用于所述最小带宽单元的子载波分配包括预定数目的子载波,所述子载波包含多个数据子载波和多个导频子载波,并且
其中,用于所述子载波分配的多个预定调制和编码方案(MCS)组合被限于整数数目的每OFDM符号已编码比特(Ncbps)和整数数目的每OFDM符号数据比特(Ndbps)。
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