CN104769865A - 用于改进的lte新载波类型的时间和频率同步 - Google Patents
用于改进的lte新载波类型的时间和频率同步 Download PDFInfo
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Abstract
在LTE***中可用作为辅小区的一种特定类型的分量载波是已减少了或者清除了传统控制信令(例如,省略CRS)的新类型载波。本文描述了用于当在分量载波中不存在CRS时,在eNB与UE之间的下行链路中执行定时和频率同步的替代技术。这些技术涉及使用信道状态信息参考信号或者UE特定的参考信号。
Description
优先权要求
本申请要求享受于2012年6月29日递交的美国专利申请序列号No.13/537,271的优先权,该美国专利申请要求享受于2012年1月27日递交的美国临时专利申请序列号61/591,641的优先权,故以引用方式将所有这些申请的全部内容并入本文。
背景技术
载波聚合是第三代合作伙伴计划(3GPP)作为LTE规范的版本10的一部分所发布的改进的LTE(改进的长期演进或者LTE-A)的特征,其用于通过将多个载波聚合在一起以增加总带宽,来增加数据速率。该多个载波(其称为分量载波)可以占据连续的或者非连续的带宽。分量载波有时还称为服务小区。对于时分双工(TDD)而言,服务小区是单载波频率,其中,在不同的子帧中发生用户设备(UE)与增强型节点B(eNB)之间的上行链路传输和下行链路传输。对于频分双工(FDD)而言,服务小区包括两个不同的载波频率或者下行链路传输和上行链路传输。每一个UE具有单个服务小区(其称为主小区(PCell)),该单个服务小区提供用于与eNB进行通信的所有必要的控制功能。所有其它服务小区称为辅小区(SCell)。对于某些类型的SCell而言,需要用于维持时间和频率同步的改进的技术。
附图说明
图1示出了UE和eNB。
图2示出了OFDM发射机和OFDM接收机。
图3A是示出了CSI参考信号的子帧周期的表格。
图3B示出了针对类型2 TDD帧的CSI参考信号的映射的例子。
图4是示出CSI参考信号到具有正常循环前缀的OFDM符号的资源单元的映射的表格。
图5是示出了CSI参考信号到具有扩展循环前缀的OFDM符号的资源单元的映射的表格。
图6到图10示出了映射到不同天线端口的资源单元的CSI参考信号的例子。
图11和图12示出了映射到向增强型PDCCH分配的资源块的UE特定的参考信号的例子。
具体实施方式
以下的描述和附图充分地说明了特定的实施例,以使得本领域技术人员能够实施它们。其它实施例可以并入有结构的、逻辑的、电气的、过程的和其它的改变。一些实施例的部分和特征可以包含在其它实施例的部分和特征中,或者替代其它实施例的部分和特征。在权利要求中所阐述的实施例涵盖那些权利要求的所有可用等效项。
LTE***使用导频信号(其称为参考信号(RS)),以便使UE和eNB对这些设备在其上进行通信的射频信道的特性进行估计。一种这样的RS是在下行链路中发送的小区特定的参考信号(其还称为公共参考信号(CRS)),PCell和SCell中的UE使用小区特定的参考信号来进行信道估计,并且还维持与eNB的定时和频率同步。但是,可用作SCell的一种特定类型的分量载波是所谓的新类型载波,为了增加频谱效率和能量效率,该新类型载波至少已减少了或者清除了传统控制信令(例如,省略CRS)。本文所描述是用于当在分量载波中不存在CRS时,在eNB与UE之间的下行链路中执行定时和频率同步的替代技术。
LTE下行链路
LTE的物理层是基于用于下行链路的正交频分复用(OFDM)和相关技术、用于上行链路的单载波频分复用(SC-FDM)。图1示出了UE 100和eNB 150的例子。该UE和eNB分别包含处理电路110和处理电路160,这些处理电路中的每一个旨在表示用于执行如下文所描述的处理功能的任何类型的硬件/软件配置。UE中的处理电路110连接到多个RF收发机120,该多个RF收发机120各自连接到多个天线130中的一个天线。eNB中的处理电路160连接到多个RF收发机170,该多个RF收发机170各自连接到多个天线180中的一个。为了通过下行链路发送数据,处理电路160将数据流形成码字。调制映射器根据诸如正交幅度调制(QAM)之类的调制方案来将码字映射到复调制符号。在其中由多个天线来发送多个层的数据的MIMO(多输入多输出)模式中,层映射器将复调制符号中的每一个映射到多个传输层中的一个。随后,预编码器可以将这些传输层中的每一个传输层映射到多个天线端口中的一个(其中,一个天线端口是一个物理天线)或者其组合,其中天线端口由如下文所描述的单独的OFDM发射机进行服务。随后,将预编码器产生的天线特定的符号分发到每一个OFDM发射机的资源单元(RE)映射器,该RE映射器将各个这样的符号映射到特定的RE。如下文所描述的,一个RE与在特定的时间间隔期间发送的特定OFDM子载波相对应。由具有单独的OFDM接收机的UE的天线130中的每一个天线来接收所发送的层,其中,该过程实质上通过OFDM和MIMO解调来进行反向,以恢复所发送的数据。
图2示出了通过eNB的处理电路和RF收发机所实现的OFDM发射机20,以及通过UE的处理电路和RF收发机所实现的OFDM接收机30,以形成下行链路的一部分的框图。RE映射器22从调制器21(其代表如上文所描述的调制映射器和层映射器/预编码器)接收复调制符号,将它们分配到具有N个复值的符号的块。由于这些复值的符号用于确定特定的子载波的幅度和相位,因此它们称为频域符号。接着,将这N个频域符号(每一个是表示多个输入比特的复数)输入到N点逆快速傅里叶变换(IFFT)23,并且通过并串转换器24来转换成串行的离散时间信号。在框25处添加循环前缀,以便提供针对多径失真的增强的抵抗。因此,所生成的离散时间信号构成了时域波形的N个采样(其表示正交子载波波形的总和,其中每一个子载波波形通过频域符号进行调制),称为OFDM符号。这些时域波形采样由数模转换器26转换成模拟波形,使用射频载波频率进行上混频,并且通过无线信道50来发送。在接收机30处,使用该载波频率对所接收的信号进行下混频,对该信号进行滤波,并且通过A/D转换器31进行采样。在去除了循环前缀并且从串行转换成并行(分别如框32和框33所描述的)之后,在框34处执行N点FFT以恢复频域符号,在均衡器36处将这些符号与复幅度和相位进行相乘以补偿信道延迟扩展,随后在框35处将其连同来自其它天线的OFDM接收机的频域符号进行MIMO解调以生成所发送的数据流。
根据3GPP LTE规范,将下行链路传输组织成无线帧,每一个无线帧具有10ms的持续时间。每一个无线帧由10个子帧构成,每一个子帧由两个连续的0.5ms时隙构成。对于扩展循环前缀来说每一个时隙包括六个OFDM符号,以及对于正常循环前缀来说每一个时隙包括七个OFDM符号。数据映射在由称为资源单元(RE)的基本单元构成的时间/频率资源网格上,通过天线端口、子载波位置和在无线帧内的OFDM符号索引来唯一地标识这些RE。与单个时隙内的十二个连续的子载波相对应的一组资源单元称为资源块(RB)。
时间和频率同步
为了对OFDM信号进行相干解调,UE必须与eNB建立定时和频率同步。前者是指所发送的信号的时域采样与在帧、子帧和OFDM符号之间的边界之间的对应关系。后者是指下混频的频率与所发送的载波频率之间的对应关系。UE通过小区搜索过程,与eNB初始地建立时间和频率同步,以及获取关于特定小区的信息,该小区搜索过程涉及在主同步信号和辅同步信号(分别为PSS和SSS)上执行的相关操作,PSS和SSS包括在每一个子帧中的指定时隙中的在DC子载波的每一侧的31个子载波上的指定符号中。在一些情况下,可以使用由eNB发送的定位参考信号(PRS)来替代用于初始同步的PSS/SSS信号。
在定时和频率同步的初始建立之后,有必要执行持续的精细调整以实现最佳操作。在定时同步的情况下,只要相对于OFDM符号边界的任何定时偏移小于循环前缀的长度与最大信道延迟扩展之间的差值,将不发生符号间干扰,并且由该时间偏移引起的相移可以通过OFDM接收机的均衡器36来校正。但是,为了提供对最大信道延迟扩展的改变(例如,源自于变化的多径失真)的健壮的抵抗,期望使用精细调整来使时间偏移最小化,该精细调整被连续地执行以补偿时间漂移。在频率同步的情况下,为了对由于UE的移动而造成的多普勒频率偏移以及对在该UE和/或eNB处的振荡器漂移进行补偿,连续的精细调整以使任何频率偏移最小化是有必要的。由于子载波之间的间距很近,因此OFDM信号对于频率偏移非常敏感,并且任何显著的频率偏移将破坏子载波之间的正交性,从而导致载波间干扰。
为了执行如上文所讨论的时间和频率同步的精细调整,UE可以使用由eNB在指定资源单元中发送的参考信号。该功能可以通过如图2中所示出的UE的OFDM接收机的定时/频率同步块38来执行。在时域中相对于OFDM符号边界的定时偏移导致经解调的频域符号的成比例的相移,该成比例的相移根据子载波频率而变化。因此,可以通过在不同的子载波频率上对参考信号的相移进行测量来估计该定时偏移,并且可以通过对在不同的时间处所测量的相移进行平均来获得更精确的估计量。频率偏移导致经解调的频域符号的成比例的相移,该成比例的相移随时间而变化,但独立于具体的子载波。因此,可以通过在不同的时间处对参考信号的相移进行测量来估计该频率偏移,更精确的估计量通过对在不同的子载波频率处的该相移进行平均来获得。
在时间偏移的估计之后,UE的OFDM接收机的定时/频率同步块38可以相应地调整该OFDM接收机中的用于FFT的起始点。定时/频率同步块38可以通过调整用于对接收信号进行下混频的振荡器,或者通过在执行FFT之前对采样的接收信号进行数字滤波,来提供针对所估计的频率偏移的补偿。
如上文所提到的,连接到传统LTE小区的UE可以使用CRS来进行定时/频率同步。使用天线端口p0到p3,在指定资源单元中发送CRS。此外,如上文所提到的,但辅小区新类型载波可能不包括CRS。下文所描述的是用于处理这种情形的实施例。
用于定时/频率同步的CSI参考信号
UE使用诸如前述的CRS之类的参考信号来对信道进行估计以用于解调和用于定时/频率同步。UE使用在下行链路中发送的其它参考信号来测量信道状态信息(CSI),以便向eNB提供反馈。这些参考信号称为CSI参考信号或者CSI-RS。根据LTE规范(2011年3月的3GPP TS 36.211 V10.1.0),可以以每5、10、20、40或80个子帧的周期通过多达八个天线端口来发送CSI-RS。在其中解调参考信号用于信道估计的情况下,如版本10中所定义的CSI-RS专门旨在由终端用于获取信道状态信息。这些CSI-RS具有明显更低的时间/频率密度,因此与CRS相比导致更少的开销。
如当前所定义的CSI-RS的5ms到80ms周期太稀疏,以至于不能执行精确的频率和时间跟踪。例如,对于频率偏移值为Δf而言,间隔Δt秒的两个RS符号之间的相位旋转是:在UE处,相位旋转的值其中k是整数值,并且θ在范围[-π,π]之内,是不可区分的。因此,对于给定的Δt值,如果Δf≤1/2Δt,UE将只能够校正频率偏移。例如,如果CSI-RS被配置为具有5ms的周期,则在包含CSI-RS的两组子帧中的两个RS符号之间的距离将是5ms,即Δt=5ms。随后,UE将能够估计只处于±100Hz的范围中的频率误差。使用子帧内的后续的CSI-RS符号,UE将能够估计±14000Hz的频率误差。但是,如果位于单个子帧内的CSI-RS符号用于频率跟踪,则对于实际实现来说,精细频率跟踪的误差粒度将非常的大。
下文所描述的是通过其UE的OFDM接收机的定时/频率同步块38可以使用CSI-RS来作出对定时和/或频率同步的调整的技术。这些技术的实施例包括:以减小的周期来发送CSI-RS,发送具有修改的RS模式的CSI-RS,以及减小的周期和修改的RS模式两者的结合。
如上文所讨论的,在计算相位旋转以便获得适当的操作点时,两个RS之间的符号距离是重要的。用于调整CSI-RS的周期的选项将有益于选择适当的操作范围,以增强频率偏移估计。可以在每一UE基础上作出这种决策,并且这种决策可以受eNB或网络控制。为了支持具有减小的和/或可配置的周期的CSI-RS传输,图3A示出了如在上面所引用的TS 36.211V10.1.0中定义的表格6.10.5.3-1的一种修改。对于类型1帧结构(FDD),该修改的表格包括针对编号为155到164的CSI-RS-子帧配置(CSI-RS-SubframeConfig)ICSI-RS的添加的条目,它们具有每1、2、3或4个子帧的周期。对于类型2帧结构(FDD),该修改的表格包括针对编号为155到158的CSI-RS-子帧配置ICSI-RS的添加的条目,它们具有每5个子帧的周期。此外,针对添加的CSI-RS-SubframeConfig ICSI-RS条目,还给出了CSI-RS子帧偏移,其表示在该周期内携带CSI-RS的子帧的偏移。注意,对于类型2帧结构而言,给出了针对编号为155到158的配置的多个偏移,它们都具有5个子帧的周期。举例而言,图3B示出了针对配置ICSI-RS=158的CSI-RS的映射,其示出了每5个子帧发送的两个CSI-RS子帧(3,4)。使用如图3中所示出的减小的周期1、2、3和4个子帧,UE将能够分别估计±500Hz、±250Hz、±167 Hz和±125Hz的频率误差。
如先前所提到的,如果用于相位旋转计算的RS在时间上间隔非常接近,则所要求的相位估计的粒度将是不可获得的。这是由于诸如量化误差、定点实现之类的实际实施限制。另一方面,如果这些RS在时间上间隔非常远,则UE将不能够区分具有不同的k值的相位旋转可以通过以使得用于相位旋转估计的RS对在时间上具有更优的距离的方式布置这些RS(通过分隔现有的RS或者添加新的RS)来处理这种情形。其它的RS并不需要必须在频率上对齐。但是,为了实现频率选择性信道的健壮性,期望将这些RS放置在相同的子载波中(例如,对于单个资源块,将RS对放置在位置(k1,l1)和(k1,l2),其中k和l分别是子载波和OFDM符号索引)。用于实现频率估计的其它开销是可调整的。
在图4和图5中示出了用于实现时间/频率同步的修改的CSI-RS模式的示例性实施例。图4是上面所引用的TS 36.211V10.1.0(2011-03)中的用于具有正常循环前缀的OFDM符号的表格6.10.5.2-1的修改版本,其中将针对另外的CSI-RS所增加的条目指定为CSI参考信号配置32到38。图5是上面所引用的TS 36.211V10.1.0(2011-03)中的用于具有扩展循环前缀的OFDM符号的表格6.10.5.2-2的修改版本,其中将针对另外的CSI-RS所增加的条目指定为CSI参考信号配置28到34。图4和图5中的表格示出了针对下面两种类型的帧的CSI-RS到RE的映射:在频分双工(FDD)模式中使用的类型1帧、在时分双工(TDD)模式中使用的类型2帧。
图4中的表格示出了CSI参考信号到资源单元(k,l)的映射,其中k和l分别是在频域和时域中的索引,并且其中:
对于天线端口p15和p16,k=k’+m+0,
对于天线端口p17和p18,k=k’+m+-6,
对于天线端口p19和p20,k=k’+m+-1,
对于天线端口p21和p22,k=k’+m+-7,
m=0、1、…、NRB-1,其中NRB是下行链路时隙中的资源块的数量,
l=l’+l”,以及
l”=0、1。
图5中的表格类似地示出了CSI参考信号到资源单元(k,l)的映射,其中k和l分别是在频域和时域中的索引,并且其中:
对于天线端口p15和p16,k=k’+m+0,
对于天线端口p17和p18,k=k’+m+-3,
对于天线端口p19和p20,k=k’+m+-6,
对于天线端口p21和p22,k=k’+m+-9,
m=0、1、…、NRB-1,其中NRB是下行链路时隙中的资源块的数量,
l=l’+l”,以及
l”=0、1。
有可能只使用在图4和图5中所示出的另外介绍的CSI-RS的一个子集。图6到图10通过针对所指定的天线端口中的每一个天线端口,示出了在其中映射CSI-RS的子帧中所包含的两个连续资源块的资源网格,来说明根据图4和图5的表格的CSI-RS的映射。该网格中的每一个方块是具有坐标为(k,l)的RE,其中k和l分别是在频域和时域中的索引,并且其中,每一个网格的左下角方块与具有坐标为(0,0)的原点相对应。图6针对八个天线端口p15到p22中的每一个天线端口,示出了根据CSI配置32(正常循环前缀)的CSI参考信号的映射。图7针对四个天线端口p15到p18中的每一个天线端口,示出了根据CSI配置33(正常循环前缀)的CSI参考信号的映射。图8针对两个天线端口p15和p16中的每一个天线端口,示出了根据CSI配置34(正常循环前缀)的CSI参考信号的映射。图9针对两个天线端口p15和p16中的每一个天线端口,示出了根据CSI配置35(正常循环前缀)的CSI参考信号的映射。图10针对八个天线端口p15到p22中的每一个天线端口,示出了根据CSI配置28(扩展循环前缀)的CSI参考信号的映射。用于定时/频率同步的UE特定的参考信号
在另一个实施例中,当在分量载波中不存在CRS时,在利用PSS/SSS或者PRS信号进行初始同步之后,使用UE特定的参考信号(UERS)来执行时间/频率同步的精细调整和跟踪。UERS是经预编码的参考信号,其旨在供特定的UE在进行数据解调时使用。UERS仅仅在分配给该特定的UE的资源块中进行发送,并且使用与向该UE发送数据所使用的相同预编码器来进行预编码。
使用UERS用于定时/频率同步目的带来的问题是:当存在针对某个UE的分配时,才发送UERS。对于定时/频率跟踪和多普勒扩展估计而言,期望在不同的子帧(它们使用相同的预编码器来进行预编码)上定期地具有可用的UERS。为了解决该问题,采用针对增强型物理下行链路控制信道(ePDCCH)的修改的设计方案。在该设计方案中,将ePDCCH映射到每一个子帧中的每一个时隙的指定数量的RB。在ePDCCH所映射到的每一个RB中使用预定义的预编码来发送UERS。在一个实施例中,在具有预定义的预编码的每一个指定资源块中发送UERS,该预定义的预编码在时域中从RB到RB保持不变,但在频域中从RB到RB发生变化。在另一个实施例中,在具有预定义的预编码的每一个指定资源块中发送UERS,该预定义的预编码在时域中从RB到RB发生交替。
图11示出了均包含两个时隙的连续FDD子帧的一个例子,其中在每一个时隙内发送21个RB。在该图中,每一个方块代表根据沿着垂直轴的频率和根据沿着水平轴的时间来映射的单个RB。在该例子中,每一个时隙中的总共21个RB之中取出的4个RB被保留为用于具有预定义的预编码的ePDCCH的资源,其中在该资源处始终发送UERS。使用通过下标所指定的预编码器对每一个UERS进行预编码,使得在包含UERS的RB中的每一个RB中将四种不同预编码的UERS指定为UERS1、UERS2、UERS3或UERS4。对于所选择的保留的4个RB,使用从秩1或秩2码本的完整子集中所选择的随机预编码器来对每一个RB进行预编码。例如,在具有四个发射天线的ePDCCH的秩1传输的情况下,在第一ePDCCH RB中所使用的预编码器可以是[1111],第二预编码器可以是[11-1-1],第三预编码器可以是[1-1-11],以及最后一个预编码器可以是[1-11-1]。
为了减少控制信令开销,可能期望(例如)每时隙只保留3个RB用于ePDCCH。在该情况下,可以选择仅仅前3个预编码器来用于在不同的频率上对UERS进行预编码。eNB可以配置具有预定义的预编码的ePDCCH的大小和为SCell的分量载波所分配的资源,并且由eNB通过PCell载波以信号形式发送给UE。
如果发射天线的数量很大,并且为ePDCCH所保留的资源很小,则如上文所描述的随机波束模式可能不能为控制传输提供足够的空间覆盖。由于一些UE可能蒙受ePDCCH解调性能损失,因此这是不期望的。在该情况下,预编码器可以在一个子帧上从RB到RB遵循一模式进行旋转。在图12中示出的例子中,为ePDCCH所分配的RB中的每一个连续UERS使用不同的预编码器来进行预编码,该不同的预编码器随着各个RB交替。随后,UE可以在每一个指定的频率范围中使用这些交替地经预编码的UERS中的一个或多个来执行频率同步。UERS预编码的模式可以是灵活的,并且eNB可以通过PCell载波将其以信号形式发送给UE。
示例性实施例
在第一实施例中,一种在LTE网络中作为UE来操作的设备,包括:RF收发机,其用于提供用于与作为eNB来操作的基站进行通信的LTE空中接口;处理电路,其被配置为:经由被配置作为主小区和辅小区(PCell和SCell)的分量载波来连接到所述eNB,其中所述辅小区载波不包括CRS;以及其中,所述处理电路还被配置为:通过所述SCell载波来接收信道状态信息参考信号(CSI参考信号),并且还被配置为:使用CSI参考信号来进行时间和频率同步。
在第二实施例中,一种在LTE网络中作为eNB来操作的设备,包括:RF收发机,其用于提供用于与UE进行通信的LTE空中接口;处理电路,其被配置为:经由被配置作为主小区和辅小区(PCell和SCell)的分量载波来连接到UE,其中所述辅小区载波不包括CRS;以及其中,所述处理电路还被配置为:通过所述SCell载波来发送CSI参考信号,以供UE在执行时间和频率同步时使用。
在第一实施例或第二实施例中的任何一个之中,所述处理电路可以被配置为:接收或者发送映射到针对类型1帧结构的每一个、每两个、每三个或每四个子帧的指定资源单元的所述CSI参考信号以及映射到针对类型2帧结构的具有从(0,3,4)、(0,3)(0,4)或(3,4)中选择的子帧偏移的每五个子帧的指定资源单元的所述CSI参考信号。在另一个实施例中,所述处理电路可以被配置为:接收或者发送包含在指定子帧之内的两个CSI参考信号,所述指定子帧由所述eNB使用来发送CSI参考信号。在第一实施例中,所述处理电路可以被配置为:通过在不同的载波频率上对CSI参考信号的相移进行测量来估计时间偏移,并且所述处理电路可以被配置为:通过在不同的时间处对CSI参考信号的相移进行测量来估计频率偏移。第一实施例的所述处理电路还可以被配置为:对在不同的时间处在不同的载波频率上所测量的CSI参考信号的相移进行平均,以便估计所述时间偏移,并且所述处理电路还可以被配置为:对在不同的载波频率上在不同的时间处所测量的CSI参考信号的相移进行平均,以估计所述频率偏移。
在第一实施例或第二实施例中的任何一个之中,所述处理电路可以被配置为:接收或者发送具有正常循环前缀的OFDM符号;在被指定用于携带CSI参考信号的子帧中接收或者发送所述CSI参考信号,其中所述CSI参考信号映射到资源单元(k,l),其中k和l分别是在频域和时域中的索引,其中:
对于天线端口p15和p16,k=k’+m+0,
对于天线端口p17和p18,k=k’+m+-6,
对于天线端口p19和p20,k=k’+m+-1,
对于天线端口p21和p22,k=k’+m+-7,
m=0、1、…、NRB-1,其中NRB是下行链路时隙中的资源块的数量,
l=l’+l”,
l”=0、1;以及,
接收或者发送具有从以下各项中所选择的CSI配置的CSI参考信号:
1)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,5),在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,5),以及在被指定使用八个天线端口p15到p22来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,5);
2)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(8,5),在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(8,5);
3)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(3,5);
4)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(2,5);
5)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,5),在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,5),以及在被指定使用八个天线端口p15到p22来携带CSI参考信号的子帧的仅仅第一时隙中(k’,l’)=(9,5);
6)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,5),在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的仅仅第一时隙中(k’,l’)=(9,5),以及在被指定使用八个天线端口p15到p22来携带CSI参考信号的子帧的仅仅第一时隙中(k’,l’)=(9,5);或者
7)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(8,5),以及在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的仅仅第一时隙中(k’,l’)=(8,5)。
在第一实施例或第二实施例中的任何一个之中,所述处理电路可以被配置为:接收或者发送具有扩展循环前缀的OFDM符号;在被指定用于携带CSI参考信号的子帧中接收或者发送所述CSI参考信号,其中所述CSI参考信号映射到资源单元(k,l),其中k和l分别是在频域和时域中的索引,其中:
对于天线端口p15和p16,k=k’+m+0,
对于天线端口p17和p18,k=k’+m+-3,
对于天线端口p19和p20,k=k’+m+-6,
对于天线端口p21和p22,k=k’+m+-9,
m=0、1、…、NRB-1,其中NRB是下行链路时隙中的资源块的数量,
l=l’+l”,
l”=0、1;以及,
接收或者发送具有从以下各项中所选择的CSI配置的CSI参考信号:
1)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,4),在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,4),以及在被指定使用八个天线端口p15到p22来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,4);
2)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(3,4),在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(3,4);
3)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(6,4);
4)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(0,4);
5)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,4),在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,4),以及在被指定使用八个天线端口p15到p22来携带CSI参考信号的子帧的仅仅第一时隙中(k’,l’)=(9,4);
6)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,4),在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的仅仅第一时隙中(k’,l’)=(9,4),以及在被指定使用八个天线端口p15到p22来携带CSI参考信号的子帧的仅仅第一时隙中(k’,l’)=(9,4);或者
7)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(3,4),以及在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的仅仅第一时隙中(k’,l’)=(3,4)。
在第三实施例中,一种在LTE网络中作为UE来操作的设备,包括:RF收发机,其用于提供用于与作为eNB来操作的基站进行通信的LTE空中接口;处理电路,其被配置为:经由被配置作为主小区和辅小区(PCell和SCell)的分量载波来连接到所述eNB,其中所述辅小区载波不包括CRS;以及其中,所述处理电路还被配置为:在增强型物理下行链路控制信道(ePDCCH)中通过所述SCell载波来接收UE特定的参考信号(UERS),并且所述处理电路还被配置为:使用所述UERS来进行时间和频率同步;以及,其中,所述处理电路还被配置为:接收各子帧的每一个时隙中为所述ePDCCH所保留的指定数量的资源块,其中在所述指定数量的资源块中始终发送UERS。
在第四实施例中,一种在LTE网络中作为eNB来操作的设备,包括:RF收发机,其用于提供用于与UE进行通信的LTE空中接口;处理电路,其被配置为:经由被配置作为主小区和辅小区(PCell和SCell)的分量载波来连接到UE,其中所述辅小区载波不包括CRS;其中,所述处理电路还被配置为:在增强型物理下行链路控制信道(ePDCCH)中通过所述SCell载波来发送UERS,以供所述UE在执行时间和频率同步时使用;以及,其中,所述处理电路还被配置为:发送各子帧的每一个时隙中为所述ePDCCH所保留的指定数量的资源块,其中在所述指定数量的资源块中始终发送UERS。
在第三实施例或第四实施例中的任何一个之中,所述处理电路可以被配置为:在所述指定资源块中的每一个中接收或者发送具有预定义的预编码的UERS,其中所述预定义的预编码在所述子帧上是不变的,但在频域中从资源块到资源块发生改变。在第三实施例或第四实施例中的任何一个之中,所述处理电路可以被配置为:在所述指定资源块中的每一个中接收或者发送具有预定义的预编码的UERS,其中所述预定义的预编码在时域中与各个相继的资源块交替。
上文所描述的实施例可以用各种硬件配置来实现,各种硬件配置可以包括用于执行指令的处理器,所述指令执行所描述的这些技术。此类指令可以包含在适当的存储介质形式中,通过该适当的存储介质形式,将这些指令传送到存储器或者其它处理器可执行介质。
可以在多种环境下(例如,无线局域网(WLAN)、第三代合作伙伴计划(3GPP)通用陆地无线接入网(UTRAN)或者长期演进(LTE)或长期演进(LTE)通信***中的一部分)实现如本文所描述的实施例,但本发明的保护范围并不受限于该方面。示例性LTE***包括与基站(由LTE规范定义为eNode-B)进行通信的多个移动站(由LTE规范定义为用户设备(UE))。
本文提到的天线可以包括一个或多个定向或全向天线,其包括例如偶极天线、单极天线、贴片天线、回路天线、微带天线或者适用于传输RF信号的其它类型的天线。在一些实施例中,可以使用具有多个孔径的单个天线,来代替两个或更多个天线。在这些实施例中,可以将每一个孔径视作为单独的天线。在一些多输入多输出(MIMO)实施例中,天线可以被有效地分离开,以利用在每一个天线与发送站的天线之间产生的空间分集和不同的信道特性。在一些MIMO实施例中,可以使天线分离开多达波长的1/10或者更多。
在一些实施例中,如本文所描述的接收机可以被配置为根据特定的通信标准(例如,电气和电子工程师学会(IEEE)标准,包括IEEE 802.11-2007和/或802.11(n)标准和/或针对WLAN所提出的规范)来接收信号,但本发明的保护范围并不受限于该方面,因为它们还可以适合于根据其它技术和标准来发送和/或接收通信。在一些实施例中,该接收机可以被配置为:根据用于无线城域网(WMAN)的IEEE 802.16-2004、IEEE 802.16(e)和/或IEEE802.16(m)标准(包括其变型和演进)来接收信号,但本发明的保护范围并不受限于该方面,因为它们还可以适合于根据其它技术和标准来发送和/或接收通信。在一些实施例中,该接收机可以被配置为根据通用陆地无线接入网(UTRAN)LTE通信标准来接收信号。要获取关于IEEE 802.11和IEEE802.16标准的更多信息,请参考“IEEE Standards for Information Technology--Telecommunications and Information Exchange between Systems”局域网-具体要求-部分11“Wireless LAN Medium Access Control(MAC)and PhysicalLayer(PHY),ISO/IEC 8802-11:1999”以及2005年5月的城域网-具体要求-部分16“Air Interface for Fixed Broadband Wireless Access Systems”和相关的修订/版本。要获取关于UTRAN LTE标准的更多信息,参见2008年3月的用于UTRAN-LTE版本8的第三代合作伙伴计划(3GPP)标准(包括其变型和演进)。
已结合前述的特定实施例描述了本发明的主题。应当意识到,这些实施例还可以以被认为是有利的方式来进行组合。此外,对于本领域普通技术人员来说,许多替代方案、变型和修改将是显而易见的。其它这样的替代方案、变型和修改旨在落入以下所附权利要求书的保护范围之内。
提供摘要是为了符合37 C.F.R Section 1.72(b),37 C.F.R Section 1.72(b)要求将允许读者确定本技术公开的性质和要点的摘要。提交时应理解,摘要将不用于限制或者解释权利要求的保护范围或者含义。故将所附权利要求并入到具体实施方式中,其中每项权利要求本身代表独立的实施例。
Claims (23)
1.一种在LTE网络中作为用户设备(UE)来操作的设备,包括:
RF收发机,其用于提供用于与作为增强型/演进型节点B(eNB)来操作的基站进行通信的LTE空中接口;
处理电路,其被配置为:经由被配置作为主小区和辅小区(PCell和SCell)的分量载波来连接到所述eNB,其中所述辅小区载波不包括小区特定的参考信号(CRS);
其中,所述处理电路还被配置为:通过所述SCell载波来接收信道状态信息参考信号(CSI参考信号),并且,如果所述SCell载波省略CRS,则所述处理电路还被配置为:使用所述CSI参考信号来进行时间和频率同步。
2.根据权利要求1所述的设备,其中,所述处理电路被配置为:接收映射到针对类型1帧结构的每一个、每两个、每三个或每四个子帧的指定资源单元的所述CSI参考信号,以及接收映射到针对类型2帧结构的具有从(0,3,4)、(0,3)(0,4)或(3,4)中选择的子帧偏移的每五个子帧的指定资源单元的所述CSI参考信号。
3.根据权利要求1所述的设备,其中,所述处理电路被配置为:接收包含在指定子帧之内的两个CSI参考信号,所述指定子帧由所述eNB使用来发送CSI参考信号。
4.根据权利要求1所述的设备,其中,所述处理电路被配置为:
接收具有正常循环前缀的OFDM符号;
在被指定用于携带CSI参考信号的子帧中接收所述CSI参考信号,其中所述CSI参考信号映射到资源单元(k,l),其中k和l分别是在频域和时域中的索引,其中:
对于天线端口p15和p16,k=k’+m+0,
对于天线端口p17和p18,k=k’+m+-6,
对于天线端口p19和p20,k=k’+m+-1,
对于天线端口p21和p22,k=k’+m+-7,
m=0、1、…、NRB-1,其中NRB是下行链路时隙中的资源块的数量,
l=l’+l”,
l”=0、1;以及,
接收具有从以下各项中所选择的CSI配置的CSI参考信号:
1)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,5),在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,5),以及在被指定使用八个天线端口p15到p22来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,5);
2)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(8,5),在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(8,5);
3)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(3,5);
4)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(2,5);
5)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,5),在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,5),以及在被指定使用八个天线端口p15到p22来携带CSI参考信号的子帧的仅仅第一时隙中(k’,l’)=(9,5);
6)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,5),在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的仅仅第一时隙中(k’,l’)=(9,5),以及在被指定使用八个天线端口p15到p22来携带CSI参考信号的子帧的仅仅第一时隙中(k’,l’)=(9,5);或者,
7)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(8,5),以及在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的仅仅第一时隙中(k’,l’)=(8,5)。
5.根据权利要求1所述的设备,其中,所述处理电路被配置为:
接收具有扩展循环前缀的OFDM符号;
在被指定用于携带CSI参考信号的子帧中接收所述CSI参考信号,其中所述CSI参考信号映射到资源单元(k,l),其中k和l分别是在频域和时域中的索引,其中:
对于天线端口p15和p16,k=k’+m+0,
对于天线端口p17和p18,k=k’+m+-3,
对于天线端口p19和p20,k=k’+m+-6,
对于天线端口p21和p22,k=k’+m+-9,
m=0、1、…、NRB-1,其中NRB是下行链路时隙中的资源块的数量,
l=l’+l”,
l”=0、1;以及,
接收具有从以下各项中所选择的CSI配置的CSI参考信号:
1)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,4),在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,4),以及在被指定使用八个天线端口p15到p22来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,4);
2)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(3,4),在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(3,4);
3)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(6,4);
4)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(0,4);
5)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,4),在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,4),以及在被指定使用八个天线端口p15到p22来携带CSI参考信号的子帧的仅仅第一时隙中(k’,l’)=(9,4);
6)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,4),在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的仅仅第一时隙中(k’,l’)=(9,4),以及在被指定使用八个天线端口p15到p22来携带CSI参考信号的子帧的仅仅第一时隙中(k’,l’)=(9,4);或者,
7)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(3,4),以及在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的仅仅第一时隙中(k’,l’)=(3,4)。
6.根据权利要求4所述的设备,其中,所述处理电路被配置为:接收映射到针对类型1帧结构的每一个、每两个、每三个或每四个子帧的指定资源单元的所述CSI参考信号,以及接收映射到针对类型2帧结构的具有从(0,3,4)、(0,3)(0,4)或(3,4)中选择的子帧偏移的每五个子帧的指定资源单元的所述CSI参考信号。
7.根据权利要求5所述的设备,其中,所述处理电路被配置为:接收映射到针对类型1帧结构的每一个、每两个、每三个或每四个子帧的指定资源单元的所述CSI参考信号,以及接收映射到针对类型2帧结构的具有从(0,3,4)、(0,3)(0,4)或(3,4)中选择的子帧偏移的每五个子帧的指定资源单元的所述CSI参考信号。
8.根据权利要求1所述的设备,其中,所述处理电路被配置为:通过在不同的载波频率上对CSI参考信号的相移进行测量来估计时间偏移,并且所述处理电路被配置为:通过在不同的时间处对CSI参考信号的相移进行测量来估计频率偏移。
9.根据权利要求8所述的设备,其中,所述处理电路被配置为:对在不同的时间处在不同的载波频率上所测量的CSI参考信号的相移进行平均,以便估计所述时间偏移,并且所述处理电路被配置为:对在不同的载波频率上在不同的时间处所测量的CSI参考信号的相移进行平均,以估计所述频率偏移。
10.一种在LTE网络中作为用户设备(UE)来操作的设备,包括:
RF收发机,其用于提供用于与作为增强型/演进型节点B(eNB)来操作的基站进行通信的LTE空中接口;
处理电路,其被配置为:经由被配置作为主小区和辅小区(PCell和SCell)的分量载波来连接到所述eNB,其中所述辅小区载波不包括小区特定的参考信号(CRS);
其中,所述处理电路还被配置为:在增强型物理下行链路控制信道(ePDCCH)中通过所述SCell载波来接收UE特定的参考信号(UERS),所述处理电路还被配置为:使用所述UERS来实现时间和频率同步;以及,
其中,所述处理电路还被配置为:接收各个子帧的每一个时隙中为所述ePDCCH所保留的指定数量的资源块,其中在所述指定数量的资源块中始终发送UERS。
11.根据权利要求10所述的设备,其中,所述UE被配置为:接收在具有预定义的预编码的所述指定资源块中的每一个中发送的所述UERS,所述预定义的预编码在所述子帧上是不变的,但在频域中从资源块到资源块发生改变。
12.根据权利要求10所述的设备,其中,所述UE被配置为:接收在具有预定义的预编码的所述指定资源块中的每一个中发送的所述UERS,所述预定义的预编码在时域中随着各个相继的资源块交替。
13.根据权利要求10所述的设备,其中,所述处理电路被配置为:通过在不同的载波频率上测量UERS的相移来估计时间偏移,并且所述处理电路被配置为:通过在不同的时间处测量UERS的相移来估计频率偏移。
14.一种用于在LTE网络中操作增强型/演进型节点B(eNB)的方法,包括:
经由被配置作为主小区和辅小区(PCell和SCell)的分量载波来连接到UE,其中所述辅小区载波不包括小区特定的参考信号(CRS);
通过所述SCell载波来发送信道状态信息参考信号(CSI参考信号),以供所述UE在执行时间和频率同步时使用。
15.根据权利要求14所述的方法,其中,所述CSI参考信号映射到针对类型1帧结构的每一个、每两个、每三个或每四个子帧的指定资源单元,以及映射到针对类型2帧结构的具有从(0,3,4)、(0,3)(0,4)或(3,4)中选择的子帧偏移的每五个子帧的指定资源单元。
16.根据权利要求14所述的方法,其中,两个CSI参考信号包含在用于发送CSI参考信号的指定子帧中。
17.根据权利要求14所述的方法,还包括:
发送具有正常循环前缀的OFDM符号;
在被指定用于携带CSI参考信号的子帧中发送所述CSI参考信号,其中所述CSI参考信号映射到资源单元(k,l),其中k和l分别是在频域和时域中的索引,其中:
对于天线端口p15和p16,k=k’+m+0,
对于天线端口p17和p18,k=k’+m+-6,
对于天线端口p19和p20,k=k’+m+-1,
对于天线端口p21和p22,k=k’+m+-7,
m=0、1、…、NRB-1,其中NRB是下行链路时隙中的资源块的数量,
l=l’+l”,
l”=0、1;以及,
发送具有从以下各项中所选择的CSI配置的CSI参考信号:
1)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,5),在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,5),以及在被指定使用八个天线端口p15到p22来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,5);
2)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(8,5),在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(8,5);
3)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(3,5);
4)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(2,5);
5)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,5),在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,5),以及在被指定使用八个天线端口p15到p22来携带CSI参考信号的子帧的仅仅第一时隙中(k’,l’)=(9,5);
6)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,5),在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的仅仅第一时隙中(k’,l’)=(9,5),以及在被指定使用八个天线端口p15到p22来携带CSI参考信号的子帧的仅仅第一时隙中(k’,l’)=(9,5);或者,
7)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(8,5),以及在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的仅仅第一时隙中(k’,l’)=(8,5)。
18.根据权利要求14所述的方法,还包括:
发送具有扩展循环前缀的OFDM符号;
在被指定用于携带CSI参考信号的子帧中发送所述CSI参考信号,其中所述CSI参考信号映射到资源单元(k,l),其中k和l分别是在频域和时域中的索引,其中:
对于天线端口p15和p16,k=k’+m+0,
对于天线端口p17和p18,k=k’+m+-3,
对于天线端口p19和p20,k=k’+m+-6,
对于天线端口p21和p22,k=k’+m+-9,
m=0、1、…、NRB-1,其中NRB是下行链路时隙中的资源块的数量,
l=l’+l”,
l”=0、1;以及,
发送具有从以下各项中所选择的CSI配置的CSI参考信号:
1)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,4),在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,4),以及在被指定使用八个天线端口p15到p22来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,4);
2)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(3,4),在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(3,4);
3)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(6,4);
4)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(0,4);
5)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,4),在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,4),以及在被指定使用八个天线端口p15到p22来携带CSI参考信号的子帧的仅仅第一时隙中(k’,l’)=(9,4);
6)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(9,4),在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的仅仅第一时隙中(k’,l’)=(9,5),以及在被指定使用八个天线端口p15到p22来携带CSI参考信号的子帧的仅仅第一时隙中(k’,l’)=(9,4);或者,
7)在被指定使用两个天线端口p15和p16来携带CSI参考信号的子帧的每一个时隙中(k’,l’)=(3,4),以及在被指定使用四个天线端口p15到p18来携带CSI参考信号的子帧的仅仅第一时隙中(k’,l’)=(3,4)。
19.根据权利要求17所述的方法,其中,所述CSI参考信号映射到针对类型1帧结构的每一个、每两个、每三个或每四个子帧的指定资源单元,以及映射到针对类型2帧结构的具有从(0,3,4)、(0,3)(0,4)或(3,4)中选择的子帧偏移的每五个子帧的指定资源单元。
20.根据权利要求18所述的方法,其中,所述CSI参考信号映射到针对类型1帧结构的每一个、每两个、每三个或每四个子帧的指定资源单元,以及映射到针对类型2帧结构的具有从(0,3,4)、(0,3)(0,4)或(3,4)中选择的子帧偏移的每五个子帧的指定资源单元。
21.一种用于在LTE网络中操作增强型/演进型节点B(eNB)的方法,包括:
经由被配置作为主小区和辅小区(PCell和SCell)的分量载波来连接到UE,其中所述辅小区载波不包括小区特定的参考信号(CRS);
在增强型物理下行链路控制信道(ePDCCH)中通过所述SCell载波来发送UE特定的参考信号(UERS),以供所述UE在执行时间和频率同步时使用;以及,
发送各子帧的每一个时隙中为所述ePDCCH所保留的指定数量的资源块,其中在所述指定数量的资源块中始终发送UERS。
22.根据权利要求21所述的方法,还包括:在具有预定义的预编码的所述指定资源块中的每一个中发送所述UERS,所述预定义的预编码在所述子帧上是不变的,但在频域中从资源块到资源块发生改变。
23.根据权利要求21所述的方法,还包括:
在具有预定义的预编码的所述指定资源块中的每一个中发送所述UERS,所述预定义的预编码在时域中随着各个相继的资源块交替。
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CN201380010149.1A Active CN104170271B (zh) | 2012-01-27 | 2013-01-23 | 用于具有每csi‑rs反馈的相干协作多点传输的演进型节点b和方法 |
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