CN102238744A - 控制信道的干扰抑制 - Google Patents

控制信道的干扰抑制 Download PDF

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CN102238744A
CN102238744A CN2011101113836A CN201110111383A CN102238744A CN 102238744 A CN102238744 A CN 102238744A CN 2011101113836 A CN2011101113836 A CN 2011101113836A CN 201110111383 A CN201110111383 A CN 201110111383A CN 102238744 A CN102238744 A CN 102238744A
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base station
computing equipment
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CN102238744B (zh
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Y·朱
Q·李
S·塔瓦尔
N·希玛亚特
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Intel Corp
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Abstract

在一些实施例中，将控制信道数据在相邻的基站之间进行传递，以分配控制信道资源，从而抑制小区间干扰。

Description

控制信道的干扰抑制
技术领域
概括地说，本发明涉及无线设备和系统，且更为具体地说，涉及用于抑制小区间干扰的设备、方法和系统。
附图说明
在附图中以举例而不是限定的方式示出了本发明的实施例，其中，相似的标记表示类似的元件。
图1是根据一些实施例的LTE网络架构的一部分的示图。
图2是示出了根据一些实施例的、针对图1的网络的下行链路资源网格结构的示图。
图3A-3D示出了现有技术中的ICIC抑制方法。
图4示出了根据一些实施例的、针对图1中的网络的控制信道干扰抑制技术。
图5示出了显示根据一些实施例的、针对不同的控制信道聚合和物理链路配置的控制信道干扰(与误块率相关)与控制信道SNR之间的关系曲线的示图。
图6是示出了根据一些实施例的CCE利用等级与INR之间的关系曲线的示图。
图7示出了根据一些实施例的、用于协调对控制信道的利用以抑制第一和第二小区之间的控制信道干扰的控制信道协调数据。
具体实施方式
本发明的实施例可以有助于促进高吞吐量移动无线网络(例如，3GPP长期演进(LTE)以及未来的网络)的性能改善。
图1示出了具有各种网络组件的LTE(长期演进)网络的端到端网络架构的一部分。该网络包括通过S1接口115耦合在一起的无线接入网(例如，如图所描绘的E-UTRAN或演进型通用陆地无线接入网)102和核心网(EPC)120。(注意，为了方便和简洁的缘故，只示出了核心网以及RAN的一部分。还要注意的是，EPC和E-UTRAN两者在3GPP规范的版本8中均被定义为端到端网络的新的组成部分，但是本发明不限于这些特定的版本)。
核心(EPC)120包含移动性管理实体(MME)122、服务网关(服务GW)124以及分组数据网络网关(PDN GW)126。RAN 102包含宏基站(也被称为宏eNodeB或宏eNB)105、低功率(LP)基站(或LP eNB)106和107以及UE(用户设备或用户终端)110。
MME在功能上类似于传统的服务GPRS支持节点(SGSN)的控制面。其管理接入期间的诸如网关选择和跟踪区域列表管理之类的移动性方面。服务GW 124终止面向RAN的接口，并且在RAN和核心网之间对数据分组进行路由。此外，其可以是针对eNode-B间切换(inter-eNode-B handover)的本地移动性锚点，并且可以提供针对3GPP间移动性(inter-3GPP mobility)的锚点。其他的职责可以包含合法侦听、计费以及某种政策的执行。服务GW和MME可以在一个物理节点或一些单独的物理节点中实现。PDN GW终止面向分组数据网络(PDN)的SGi接口。其在EPC和外部PDN之间对数据分组进行路由，并且其可能是政策执行和计费数据收集的关键节点。其还可以提供针对非LTE接入的移动性的锚点。外部PDN可以是任意种类的IP网络和IP多媒体子系统(IMS)域。PDN GW和服务GW可以在一个物理节点或多个单独的物理节点中实现。
eNode-B(宏eNode-B和微eNode-B)终止空中接口协议，并且通常是(如果不总是)针对UE的第一个联络点。在一些实施例中，eNode-B可以实现包含但不限于RNC(无线网络控制器功能)的RAN的各种逻辑功能，例如，无线承载管理、上行链路和下行链路动态无线资源管理、数据分组调度以及移动性管理。
S1接口是将RAN和EPC分开的接口。其被分为两部分：S1-U和S1-MME，其中，S1-U携带eNode-B和服务GW之间的业务数据，S1-MME是eNode-B和MME之间的信令接口。X2接口是eNode-B之间(如下文针对微eNB所强调的，至少在大部分eNode-B之间)的接口。X2接口包括两部分：X2-C和X2-U。X2-C是eNode-B之间的控制面接口，而X2-U是eNode-B之间的用户面接口。
随着蜂窝网络的发展，LP小区一般用于将覆盖扩展到室外信号不易到达的室内区域，或者用于增加电话使用非常密集的区域(例如，火车站)中的网络容量。本文所使用的术语“低功率(LP)eNB”指的是用于实现诸如毫微微小区、微微小区或微小区之类的较窄小区(比宏小区窄)的任何适当的相对低功率的eNode-B。毫微微小区eNB一般由移动网络运营商向其住宅或企业用户提供。毫微微小区一般为家用网关的尺寸或者更小，并且通常连接到用户的宽带线路。一旦接通电源，则毫微微小区便连接到移动运营商的移动网络并且一般在30-50米的范围内为住宅毫微微小区提供额外的覆盖。因此，由于LP eNB 107是通过PDN GW 126来耦合的，所以LP eNB 107可能是毫微微小区eNB。类似地，微微小区是一般覆盖诸如建筑内(办公室、购物中心、火车站等)或者飞行器内(后者是最近出现的)这样的小区域的无线通信系统。微微小区eNB通常能够通过其基站控制器(BSC)的功能经由X2链路连接到另一个eNB(例如，宏eNB)。因此，由于LP eNB 106经由X2接口耦合到宏eNB，所以LP eNB 106可以使用微微小区eNB来实现。就此而言，微微小区eNB或其他LP eNB可以并入宏eNB的某些或者全部功能。在某些情况中，这可以称为接入点基站或企业毫微微小区。
图2示出了针对从eNB到UE的下行链路传输的下行链路资源网格的结构。所描绘的网格示出了时间-频率网格(称为资源网格)，其是下行链路中的每个时隙中的物理资源。这种时频平面的表示是针对OFDM系统的常见做法，这种做法使得无线资源的分配变得直观。资源网格的每个列和每个行分别对应于一个OFDM符号和一个OFDM载波。每个资源网格在时域中的持续时间对应于无线帧中的一个时隙。资源网格中的最小时-频单元被表示为资源单元。每个资源网格包含多个资源块，这些资源块描述了某些物理信道到资源单元的映射。每个资源块包含资源单元的集合，并且在频域中，这表示当前可以被分配的最小资源量。有几种不同的物理下行信道是使用这些资源块来转达的。这些物理下行链路信道中与本发明特别相关的两个是物理下行链路共享信道和物理下行链路控制信道。
物理下行链路共享信道(PDSCH)将用户数据和较高层信令携带到UE。除其他外，物理下行链路控制信道(PDCCH)还携带关于与PDSCH信道相关的传输格式和资源分配的信息。其还将关于与上行链路共享信道相关的传输格式、资源分配和HARQ信息通知给UE。典型地，下行链路调度(向小区内的UE分配控制信道资源块和共享信道资源块)是基于从UE反馈回eNB的信道质量信息在eNB处执行的，并且随后在用于(分配给)UE的控制信道(PDCCH)上向UE发送下行链路资源分配信息。
PDCCH使用CCE(控制信道单元)来传达控制信息。在PDCCH的复值符号被映射到资源单元之前，首先将其组织成四组(quadruplets)，随后使用子块交织器来改变这四组复值符号的顺序以进行速率匹配。使用这些控制信道单元(CCE)中的一个或多个来发送每个PDCCH，其中，每个CCE对应于9组4个物理资源单元，每组4个物理资源单元称为资源单元组(REG)。四个QPSK符号被映射到每个REG。取决于DCI的尺寸和信道状况，可以使用一个或多个CCE来发送PDCCH。LTE中目前定义了具有不同数目的CCE的4种不同的PDCCH格式(例如，聚合等级L＝1、2、4或8)。
可惜的是，小区间干扰发生于相邻的小区，这影响了相互重叠的信道。在诸如毫微微小区和微微小区中越来越多地使用LP eNB导致eNB密度不断增大，这使得上述情况日益成为尤其严重的问题。针对物理下行链路共享信道，已经付出了很多努力来设计用于抑制小区间干扰的方案，然而尽管已经提出了一些方法，但是对于下行链路控制信道做出的努力是较少的。
举例而言，参见图3B，可以实现宏eNB和LP eNB之间的符号移位。资源块的生成使得宏eNB的控制部分与LP eNB的数据部分互相冲突，并且反之亦然。如果宏eNB负载较轻，那么该方法能够有效地抑制对于LPUE的小区间干扰，这是因为数据部分的某些资源块没有被发送。但是，如果宏eNB是满负载的，那么符号移位可能不能抑制对于LP UE的干扰。另外一个问题是，该方法还需要全局同步。另一个缺点是：该方法只适用于FDD(针对上行链路的频分双工)，在需要全局帧同步时，这就阻止了TDD(时分双工)的实现方式。
如图3C所描绘的另一个方法是在相关的宏eNB和LP eNB之间使用50％的资源分割。这个方法的基本思想是将针对以子帧为粒度的时域的、针对共享信道的版本8ICIC抑制扩展到用于抑制对于控制信道的小区间干扰。如同部分频率重用方案一样，用于宏eNB和LP eNB的资源可以部分地重叠。可惜的是，这个方案也有缺点。例如，由于经历类似干扰的两个子帧之间的时间延迟增加，因此CQI(信道质量指示符)报告的延迟可能会增加。在经历不同干扰情况的子帧类型的数目较大的情况下(例如，在部分重叠的情况下)，该延迟也会更明显。此外，因为TDD帧中的固定的并且特定于帧的HARQ定时，所以该方案并不很适合于TDD。
参见图3D，另一个现有方法涉及在宏eNB和LP eNB之间创建PDCCH信道的频域正交性。这种方法也有几个缺点。空中接口会有变化，当与后续版本(例如，版本10)的eNB一些工作时，这些变化阻碍了版本8的实现方式对干扰抑制改善的利用。同样，如果FDM是物理上的并且将系统带宽从中间分成两部分，那么这可能会妨害PDCCH信道的频率分集增益。如果FDM是逻辑上的并且在频域中对两个区域进行了交织，那么为了实现这种交织，将需要很多标准化的工作以设计新的从CCE(控制信道单元)到REG(资源单元组)的映射规则。
图4-图7示出了本文所公开的用于控制信道的小区间干扰抑制的新方法的某些方面。在一些实施例中，CCE聚合等级分配和/或CCE(信道控制单元)利用可以包含在针对PDCCH的负载描述中并且在eNB间进行传送。此外，在一些实施例中，可以使用一个或多个比特作为在eNB间进行交换的PDCCH过载指示符，例如，在X2接口上进行交换。概括地说，图5示出了如何在宏eNB和LP eNB之间交换这种控制信道信息以降低PDCCH中的干扰。
图5是示出了根据一些实施例的、针对不同的控制信道聚合和物理链路配置的控制信道干扰(与误块率相关)与控制信道SNR的关系曲线的示图。例如，第一条曲线(FDD 1X2，L＝8)指示大约-4.5dB的SNR(信噪比)将导致1％的BLER(误块率)。图6是示出了根据一些实施例的、CCE利用水平与INR的关系曲线的示图。这些关系在一起能够用来更有效地在相邻小区之间对CCE资源进行分配，从而允许向具有较弱信道的小区提供额外的CCE资源，并且降低用于具有较强信道的小区的CCE，以使得每个小区具有足够的控制信道性能。
在干扰占主导地位的情况下，不同的REG能够经历截然不同的干扰+噪声功率。当主干扰源使用相同的REG时，其可以造成类似于打孔的效果。当主干扰源不使用相同的REG时，REG可能经历瞬时的高SINR。可以将由减少PDCCH负载带来的平均SINR改善建模为：
ρ = 10 · log 10 ( 1 + INR 1 + INR · α )
其中，INR是干扰对噪声比，并且α是PDCCH CCE利用率。
如果X2接口的目标eNB得知源eNB具有10％的误块率，其可以计算α值以使得ρ等于3dB。图6示出了针对这些示例的α与INR之间的关系(以INR为变量的函数)。作为一个示例，如果INR被假定为9dB，为了针对源eNB PDCCH信道实现3dB增益，目标eNB需要将PDCCH利用率控制在44％。
作为另外一个示例，图7示出了在图4中的宏eNB和LP eNB之间的X2接口上传递的、用于抑制控制信道干扰的可能的控制信道协调信息。LPeNB(enB_B)正经历较为严重的干扰，因此其被指定为(或被允许)具有80％的CCE利用，而由于eNB_A需要较小的CCE聚合来实现可接受的BLER，因此只给予eNB_A20％的CCE利用。
可以将图7中的示例扩展到时域中，例如，可以针对40ms的时间段定义数值串，并且数值串内的每个元素可以针对例如1ms的子帧来描述PDCCH负载信息。因此，可以使用不同的值来配置该时间段内的每个子帧的PDCCH负载，以例如使得两个相邻的eNB能够在时域中对调度进行协调，从而在每个子帧上较好地抑制小区间干扰。
本发明不限于所描述的实施例，而是在所附权利要求的精神和范围内，可以通过修改和改变所描述的实施例来实践本发明。例如，应当理解的是，本发明适用于所有类型的移动设备。移动设备的示例包括但是不限于个人计算机、蜂窝电话、所谓的智能电话等。此外，可以以框图的形式示出各种配置，以避免对本发明造成模糊，并且，以框图的形式示出各种配置还是因为考虑到了关于这些框图配置的实现方式的细节高度依赖于在其中实现本发明的平台这一事实，也就是说，这些细节无疑应当在本领域人员的了解范围之内。为了描述本发明的示例性的实施例，本文阐述了特定的细节；很明显，对于本领域人员而言，本发明可以不用这些具体细节来实现，或者通过改变这些具体细节来实现。因此，本说明书应当被认为是说明性的，而不是限定性的。

Claims (19)

1.一种计算设备，包括：
处理器，其用于：
接收针对两个或更多个相邻基站的控制信道误差信息，以确定每个基站为了达到预先规定的控制信道质量所需要的相关控制信道资源；以及
在所述两个或更多个基站之间向控制信道分配所确定的控制信道资源，以满足所述预先规定的控制信道质量。
2.根据权利要求1所述的计算设备，其中，所述两个或更多个基站包含宏eNode-B基站和低功率eNode-B基站。
3.根据权利要求2所述的计算设备，其中，所述宏eNode-B基站和所述低功率eNode-B基站通过X2接口链接在一起以传送控制信道数据。
4.根据权利要求3所述的计算设备，其中，所述控制信道资源包括控制信道单元(CCE)。
5.根据权利要求1所述的计算设备，其中，所述处理器确定针对用户设备链路的最大误块率，以确定控制信道质量。
6.根据权利要求5所述的计算设备，其中，所述处理器评估控制信道质量和所述误块率之间的已知关系，以满足所述预先规定的控制信道质量。
7.根据权利要求1所述的计算设备，其中，将要在所述基站之间传送CCE聚合等级分配。
8.根据权利要求1所述的计算设备，其中，在所述基站之间传送CCE利用数据。
9.根据权利要求8所述的计算设备，其中，使用一个或多个比特作为在所述基站之间通过X2接口进行交换的PDCCH过载指示符。
10.一种装置，包括：
便携式无线设备，其无线地耦合到激活LTE基站，所述激活LTE基站具有相邻的LTE基站，所述无线设备从所述激活基站接收控制信道信息，所述激活基站和相邻基站相互之间传送控制信道参数以确定每个基站为了达到预先规定的控制信道质量所需要的相关控制信道资源并且分配控制信道资源以满足针对所述基站的所述预先规定的控制信道质量。
11.根据权利要求10所述的装置，其中，所述基站包括宏eNode-B基站和低功率eNode-B基站。
12.根据权利要求11所述的装置，其中，所述宏eNode-B基站和所述低功率eNode-B基站通过X2接口链接在一起以传送控制信道数据。
13.根据权利要求12所述的装置，其中，所述控制信道资源包括控制信道单元(CCE)。
14.根据权利要求11所述的装置，其中，最大误块率被确定以识别控制信道质量。
15.根据权利要求14所述的装置，其中，对控制信道质量和所述误块率之间的已知关系进行评估以满足所述预先规定的控制信道质量。
16.根据权利要求11所述的装置，其中，将要在所述基站之间传送CCE聚合等级分配。
17.根据权利要求11所述的装置，其中，在所述基站之间传送CCE利用数据。
18.根据权利要求17所述的装置，其中，使用一个或多个比特作为在所述基站之间通过X2接口进行交换的PDCCH过载指示符。
19.根据权利要求10所述的装置，其中，在所述激活基站和相邻基站之间，资源是在时域中进行分配的。
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