CN104170436A - 对无线通信的上行链路和下行链路业务需求的异步适应的支持 - Google Patents

对无线通信的上行链路和下行链路业务需求的异步适应的支持 Download PDF

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CN104170436A
CN104170436A CN201380014661.3A CN201380014661A CN104170436A CN 104170436 A CN104170436 A CN 104170436A CN 201380014661 A CN201380014661 A CN 201380014661A CN 104170436 A CN104170436 A CN 104170436A
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enodeb
cluster
public
coupling
transmission
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CN104170436B (zh
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A·霍里亚夫
M·希洛夫
S·潘捷列夫
A·切尔维亚科夫
A·洛马耶夫
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Intel Corp
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Intel Corp
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Abstract

讨论了允许无线广域网(WWAN)内的传输点独立地适应上行链路(UL)和下行链路(DL)业务需求的技术。为了减轻由被调度用于冲突的UL和DL传输的传输点产生的潜在干扰,可以进行传输点之间的测量以便指示耦合的水平。基于传输点之间的各种耦合水平,可以形成集群。在存在高水平的耦合的情况下,传输点可以被包括在公共集群中。在存在低水平的耦合的情况下,它们可以被隔离。相同集群内的传输点被以UL和DL传输的公共模式进行调度以便避免干扰。不同集群中的传输点可以具有UL和DL传输的不同模式以便独立地适应对于在这些不同的集群中经历的UL和DL传输的相对需求。

Description

对无线通信的上行链路和下行链路业务需求的异步适应的支持
背景技术
许多无线广域网(WWAN)采用某一形式的时分双工(TDD)来调度下行链路(DL)和上行链路(UL)业务。在TDD环境中,DL和UL通信在由蜂窝无线塔(塔)覆盖的被称为小区的区域内在所述塔和无线移动设备之间发生。从塔到无线移动设备的DL通信在第一组时隙期间发生。相反,从无线移动设备到塔的UL通信在不重叠的第二组时隙期间发生。时隙的集合描述塔及其相对应的小区的UL-DL配置或TDD配置,塔在该时隙的集合内调度无线资源用于UL和DL通信。
不幸的是,当在WWAN内的不同传输点处采用不同的或异步的UL-DL/TDD配置时,干扰可能成为问题。一个塔的DL传输会干扰另一个塔处的UL接收。类似地,一个无线设备的UL传输会干扰另一无线设备处的DL接收。为了避免这样的干扰,整个WWAN可以使用公共UL-DL/TDD配置来同步地操作。
附图说明
通过结合附图以示例的方式一起说明本发明的特征的接下来的详细描述,本发明的特征和优点将变得明显;并且在附图中:
图1是说明根据示例在具有带有非对称定向业务的覆盖小区的演进型通用地面无线接入(E-UTRAN)中的演进型节点B(eNodeB)传输点的无线广域网(WWAN)的方框图;
图2是说明根据示例在具有异步上行链路(UL)-下行链路(DL)/时分双工(TDD)配置的小区之间可能发生的两种类型的干扰的方框图;
图3a是描绘根据示例对于各种水平的异步传输在UE处用于DL接收的信号与干扰加噪声比(SINR)的累积分布函数(CDF)的图表;
图3b是描绘根据示例对于各种水平的异步传输在eNodeB处用于UE接收的SINR的CDF的图表;
图4是说明根据示例的不同水平的耦合干扰的方框图,该耦合干扰可以取决于在基于异步UL-DL/TDD配置的异步传输中涉及的小区的对而由异步传输产生;
图5是说明根据示例的eNodeB的不同集群的形成以便反映不同的干扰影响的方框图,该干扰影响可能在参与基于异步UL-DL/TDD配置的异步传输的不同eNodeB之间产生;
图6是说明根据示例的eNodeB的子集群的形成以及不同集群的合并以便反映不同的干扰影响的方框图,该干扰影响可能在参与异步传输的不同eNodeB之间产生;
图7是根据另一示例描绘用于集群形成、合并和eNodeB隔离以便适应WWAN内的自适应异步定向传输的处理的流程图;
图8是描绘根据示例对于各种集群干扰水平在eNodeB处用于UL接收的SINR的CDF的图表,具有描绘对于-60dB和-90dB的集群干扰水平的集群尺寸的CDF的两个额外的曲线图;
图9是描绘根据示例对于各种集群干扰水平的DL和UL分组吞吐量的CDF的一对图表;
图10是描绘根据示例适应WWAN内的自适应异步定向传输的集群处理的流程图;
图11是说明根据示例在eNodeB处操作以便执行测量和其它功能来形成允许WWAN内的自适应异步定向传输的集群的设备的方框图;
图12是描绘根据示例用于测量干扰可能以便创建允许WWAN内的自适应异步定向传输的eNodeB集群的另一一般化处理的流程图;
图13是说明根据示例用于在适应WWAN中的各种eNodeB处的异步定向业务的同时避免干扰的设备的方框图;并且
图14是根据示例的UE的方框图。
现在将参照所说明的示例性实施例,并且本文将使用具体的语言来进行描述。然而将理解,并不因而意在限制本发明的范围。
具体实施方式
在公开和描述本发明之前,应该理解,本发明不局限于本文公开的特定的结构、过程步骤或材料,而是被扩展到其等效形式,如在相关领域中的普通技术人员将认识到的。还应该理解,本文采用的术语仅出于描述特定实施例的目的而被使用,并且并不意在是限制性的。
定义
在不同的规范中使用无线设备的不同术语。如在本文使用的,无线设备是被配置为与蜂窝无线塔进行无线通信的设备。无线设备的示例包括但不局限于用户设备(UE)和移动站(MS)。在整个这一申请中,术语“UE”可以与术语“MS”或另一形式的无线设备互换地使用。
如在本文使用的,传输点是无线广域网(WWAN)中的无线通信设备,其被配置为与位于被称为小区的地理区域内的多个无线设备进行通信。在不同的无线规范中使用传输点的不同术语。用于传输点的不同变形的术语可以包括但不局限于基站(BS)和演进型节点B(eNodeB或eNB)。术语可以互换地使用,除非以其它方式进行说明。在各自的规范中,即,在电气与电子工程师协会(IEEE)802.16和第三代合作伙伴计划(3GPP)长期演进(LTE)规范中,提供BS或eNodeB的实际定义。
如在本文使用的,术语“实质上”指动作、特性、属性、状态、结构、项目或结果的完全或几乎完全的限度或程度。例如,被“实质上”包围的对象将意味着该对象被完全包围或者被几乎完全包围。在一些情况下,与绝对完全性的偏差的精确的可允许程度可以取决于特定的上下文。然而,通常说来,完全的接近度将具有相同的总体结果,就好像获得了绝对和总体完全性一样。当在否定含义中使用以便指代动作、特性、属性、状态、结构、项目或结果的完全或几乎完全缺乏时,“实质上”的使用同样适用。
如在本文使用的,术语“相邻”可以意味着邻接,但是也可以意味着足够接近,相邻元件之间的干扰是明显的考虑,而与任何中间元件无关。
在这一说明书的主体中的其它地方可以定义其它术语。
示例实施例
关于这样的集群方案,下面提供了技术实施例的初始概述,并且接着在稍后进一步详细地描述特定的技术实施例。这一初始概述意在帮助读者更快地理解技术,但是并不意在标识技术的关键特征或基本特征,也并不意在限制请求保护的主题的范围。
在采用时分双工(TDD)形式的无线广域网(WWAN)内,对于上行链路(UL)-下行链路(DL)/TDD配置存在许多不同的可能性,对于UL和DL传输具有不同的相对数量的时隙(资源)。UL和DL专用时隙的这些不同组合可以允许传输点适应对于给定小区中的业务的不同需求。例如,在小区内的业务创建对于DL传输的更大的需求的情况下,更多的DL时隙可以被调度用于DL传输。
然而,WWAN包括可以包括多个传输点的网络,每一个传输点覆盖被称为小区的相对应的地理区域。通常是这种情况:对于DL传输时间的需求相对于对于UL传输时间的需求,并且反之亦然,可以从一个小区到另一个小区不同,有时极大地改变。研究表明,从一个小区到另一个小区动态地适应DL/UL业务需求的能力可以提高WWAN的效率,这极大地提高了数据吞吐量。小区将不被锁定到定向业务的时隙中。替代地,一个小区可以具有不同于其相邻小区的UL-DL/TDD配置,这允许它适合其自己的定向业务需求。然而,公共UL-DL/TDD配置当前被应用在WWAN中以便避免来自被调度用于不同的UL和DL传输方向的相邻传输点的潜在干扰。
尽管WWAN当前能够适应相对DL和UL业务需求以便形成同构网络,每一个传输点具有相同的TDD配置,但是由于由不同的配置造成的接着发生的干扰,在传输点水平上适应这样的需求的较高效率会是困难的。然而,其中代表小的小区的低功率传输点相对于高功率传输点在相同或不同的载波频率下操作的异构部署打开了适应小的小区中的UL-DL配置的可能性,由于在那些小区之间高得多的隔离。
不同的定向业务在所有传输点之间不具有相同的影响。为了确定该影响,可以进行传输点的对之间的潜在干扰或耦合的测量。在一对传输点之间测量到干扰的高可能性的情况下,这对传输点能够被耦合在公共集群中。在相邻集群共享一个或多个公共传输点的情况下,它们也能够被合并到公共集群中。公共集群可以应用公共UL-DL/TDD配置以便避免该公共集群中的传输点之间的任何潜在干扰。
然而,在对于WWAN中的传输点存在干扰的低可能性的情况下,该传输点可以在不同的集群中被隔离。有时,传输点能够被隔离为它们所属于的集群中的单个元件。由于干扰的可能性很低,因此不同的集群可以具有不同的UL-DL/TDD配置。结果,可以为UL-DL/TDD配置分配更加提高的水平的粒度,为传输点独立地适应变化的定向业务需求并且为效率的极大提高铺路。下面讨论额外的细节。
图1说明了无线广域网(WWAN)100中的演进型节点B(eNodeB)传输点的网络,该WWAN可以是演进型通用地面无线接入(E-UTRAN),具有带有非对称定向业务需求或非均匀小区负荷的覆盖小区。WWAN包括多个不同的小区102-108。每一个小区由地理区域组成,在该地理区域上,各自的eNodeB110a-110d被配置为与无线移动设备112a-112d进行通信。作为在本公开中讨论的实施例的一般性的重要陈述,尽管在整个这一说明书中经常使用3GPP LTE标准的术语,但是它并不意在是限制性的,并且在这一说明书的部分中的更一般术语的使用中存在例外以便进一步传达这一点。
各种小区102-108的eNodeB110a-110d被配置为支持来往在各种相对应的小区内的用户设备(UE)112a-112d的一个或多个单元的上行链路(UL)和下行链路(DL)传输二者。为了适应UL和DL传输,WWAN100使用时分双工(TDD)来使被称为DL传输的从eNodeB到UE的传输与被称为UL传输的从UE到eNodeB的传输分离。TDD可以用于将UL和DL传输分配到不同的时隙。通过将UL和DL传输分配到不同的时隙,可以避免在具有不同的定向业务的传输之间的干扰。例如,干扰可能由来自DL传输的相对高功率信号引起,该相对高功率信号干扰来自UL传输的较低功率信号(即,其在实质上相同的时间段内具有与DL传输相反的方向)。
每一个小区102-108包含来往位于每一个小区内的各种UE112a-112d的多个箭头。指向eNodeB110a-110d的细虚线剪头代表在给定时间内在UL传输中花费的平均时间量。类似地,远离eNodeB指向UE的粗实线剪头代表在该给定时间内在DL传输中花费的平均时间量。因此,UL箭头到DL箭头的相对数量就DL和UL传输而言描绘了每一个小区102-108在该给定时间量内经历的定向业务需求的相对数量。
所描绘的两个小区102、108相对于所描绘的两个其它小区104、106经历DL业务的明显较大的负荷。在给定时间量内,每一个小区可以经历不同数量的DL和UL定向业务。因此,时间资源的有效使用将指示每一个小区对专用于UL传输和DL传输的不同数量的时隙的使用。在整个这一申请中,在给定时间量内不同数量的时隙到DL和UL定向业务的分配被定义为UL-DL配置和/或TDD配置。
图2描绘了可以在具有异步UL-DL/TDD配置的小区之间发生的两种类型的干扰。在附图内,示出了被说明为具有第一eNodeB202和第二eNodeB204的无线通信环境200。尽管第一eNodeB和第二eNodeB被描绘为MaCro-Node(MCN)eNodeB,但是取决于实施例,第一eNodeB、第二eNodeB或者这两者也可以是低功率节点(LPN)。LPN可以包括宏小区、微微小区、毫微微小区、家庭eNodeB小区(HeNB)、远程无线头端(RRH)、远程无线设备(RRE)、中继器或者具有比在MCN处典型使用的功率低的功率的另一类型的传输点中的一个。在这一示例中,第一eNodeB202将DL传输206传输到与第一eNodeB相关联的第一UE208。然而,第二eNodeB被调度为从与第二eNodeB相关联的第二UE212接收UL传输210。
第一eNodeB202之间的传输方向可以不同于第二eNodeB204的传输方向,因为在这两个eNodeB处的传输方向由不同的UL-DL/TDD配置216、218确定。在第一eNodeB处的时隙的传输方向由第一UL-DL/TDD配置216确定,而在第二eNodeB218处的时隙的传输方向由第二UL-DL/TDD配置确定。
第一和第二UL-DL/TDD配置216、218被划分为高达10个不同的子帧(0-9)。如在本文使用的,子帧与时间量,即时隙,相对应,在该时间量内诸如eNodeB的传输点被调度用于单个方向的业务,UL或DL。在图2中,在第五子帧(所标记的子帧4)处,第一eNodeB202根据第一UL-DL/TDD配置216被调度用于下行链路传输。这与根据第二eNodeB204的第二UL-DL/TDD配置218在第五子帧(所标记的子帧4)处对于UL接收的调度相冲突。这两个eNodeB之间的传输方向中的冲突设置两种类型的干扰的阶段。
使用大“X”描绘第一类型的干扰220,其中代表来自第一eNodeB202的DL传输206的粗实线箭头与代表来自与第二eNodeB204相关联的第二UE212的UL传输210的细虚线箭头交叉。(UL传输也由从第二UE发出的弯曲波线表示)。在这一第一类型的干扰中,来自第一eNodeB的DL传输干扰第二eNodeB被调度为接收的UL传输。
因为来自第一eNodeB202的DL传输206干扰在第二eNodeB204处的UL接收,这一第一类型的干扰220在本文被称为传输点到传输点干扰和/或eNodeB到eNodeB干扰。由于eNodeB通常传输DL传输的功率水平,这一第一类型的干扰可能是最成问题的,如在图2中的大尺寸“X”指示的。实际上,来自第二UE212的有用信号的接收功率可能经常低于来自DL传输的干扰的功率。这会使UL传输在第二eNodeB处被接收变得很难或不可能。
在图2中也使用较小的“X”描绘了第二类型的干扰222,其中从与来自第二eNodeB204的UL传输相关联的第二UE212发出的弯曲波线与代表来自第一eNodeB202的DL传输206的粗实线箭头交叉。(UL传输也由细虚线箭头表示)。这一第二类型的干扰根据由来自第二UE的UL传输对来自第一eNodeB202的DL传输的干扰产生,因为该UL传输由与第一eNodeB相关联的第一UE208接收。
由于来自第二UE212的UL传输210干扰来自第一eNodeB202的DL传输在第一UE208处的接收,因此这一第二类型的干扰在本文被称为无线移动设备到无线移动设备干扰和/或UE到UE干扰。因为UE通常比eNodeB在较低功率下进行传输,由于补偿路径损耗传播的UL功率控制,在其中与图2中的第二UE相对应的参与UL传输的UE足够接近与图2中的第一UE相对应的DL接收UE的某些情况下,会产生UE到UE干扰。取决于实施例,可以测量数十到数百米的这样的距离。因此,使用较小的“X”描绘UE到UE干扰。
由两个相邻eNodeB202、204使用第一UL-DL/TDD配置216和第二UL-DL/TDD配置218引起的传输方向之间的冲突仅提供其中能够引起这样的冲突的实例的一些示例。从在图2中描绘的可能UL-DL/TDD配置的表224能够例示几个其它示例。从该表产生的可能性并不意在是限制性的。根据网络配置、网络使用负荷和其它特征,可以使用或者不使用未在表中描绘的多个不同的UL-DL/TDD配置,如可以认识到的。该表仅仅描绘了对于第三代合作伙伴计划(3GPP)长期演进(LTE)标准的版本9规定的UL-DL/TDD配置。然而,UL-DL/TDD配置的其它方案是可能的。
在表224中,七个UL-DL/TDD配置中的每一个配置占据与10ms的传输时间相对应的帧。在帧传输所要求的时间逝去之后,可以重复所选择的UL-DL/TDD配置或者选择新的UL-DL/TDD配置。每一个帧可以包括十个1ms子帧。每一个子帧可以与时隙相对应。
因此,每一个子帧可以被分配用于在图2中用“U”指示的UL传输或者由“D”指示的DL传输。某些子帧也可以被分配用于由“S”指示的特殊传输时段,例如下行链路导频时隙(DwPTS)、保护时段(GP)和上行链路导频时隙UpPTS传输。如可以认识到的,每一个UL-DL配置与DL和UL传输分配的不同模式相对应,相对于DL传输,UL传输具有不同数量的分配。这些不同的模式导致在相邻小区之间干扰的可能性,eNodeB具有不同的TDD配置。
图3a提供在UE处对于DL接收的信号与干扰加噪声比(SINR)的累积分布函数(CDF)的图表300,其中UE到UE干扰是个问题。CDF根据由在R4-120837“DL-UL interference analysis for single operatormacro-outdoor pico deployment scenario in adjacent channel”(INTEL公司,2012年2月)中报告的3GPP执行的研究来提供结果。CDF由在具有包括微微小区的LPN的网络中的冲突传输方向的不同水平的模拟产生。
该模拟涉及远离彼此随机分布的四个LPN。与实曲线相对应的CDF报告所有微微小区参与DL传输的情况。点曲线与其中一半微微小区参与UL传输并且一半参与DL传输的CDF相对应。与虚曲线相对应的CDF报告一半微微小区参与DL传输并且一半关闭的情况。相反,与混合的虚曲线和点曲线相对应的CDF报告一半微微小区参与UL传输并且一半关闭的情况。
在图3a中,在从LPN接收DL传输的UE处测量SINR。在所有LPN也参与DL传输(实曲线)的情况下,来自LPN的DL传输在UE侧处干扰。因此,对于这一情况的CDF代表最低SINR。
然而,CDF的SINR保持低,即使当一半LPN被从DL传输切换到UL传输(点线)时。当具有50%DL LPN传输和50%UL LPN传输(点曲线)的情况与具有50%DL LPN传输和50%的LPN关闭(虚曲线)的情况相比较时,可以看到UE到UE干扰的贡献,对此,在相对应的CDF中的SINR值稍微较高。对于具有50%UL LPN传输和50%的LPN关闭(混合的虚曲线和点线曲线)的情况,最终CDF与SINR的最高值相对应。
图3b提供在eNodeB处对于UL接收的SINR的CDF302,其中eNodeB到eNodeB干扰是个问题。CDF报告由在R4-120837中报告的3GPP执行的研究的结果,如上面讨论的。与在图3a中相同,在具有包括微微小区的LPN的网络中,根据冲突传输方向的不同水平来提供关于以dB为单位测量的SINR的各种CDF的报告。也与在图3a中的情况相同,四个LPN在MCN eNodeB的覆盖区域内彼此远离地进行随机分布。
与粗实曲线相对应的CDF报告其中一半微微小区参与UL传输并且一半参与DL传输的情况。虚曲线与CDF相对应,其中一半微微小区参与DL传输并且一半关闭。与实平坦曲线相对应的CDF报告所有微微小区参与UL传输的情况。点曲线代表对于一半微微小区参与UL传输并且一半关闭的情况的CDF。
可以在图3a中描绘的各种CDF中清楚地看到eNodeB到eNodeB干扰的强潜在影响。在附图中,在从MCN的覆盖区域内的UE接收UL传输的eNodeB处测量SINR。对于使用CDF报告的两种情况,由图3b中的虚椭圆围绕的跨越大约30dB的架子与eNodeB到eNodeB干扰问题相对应。如可以认识到的,如在图2中解释的,这一eNodeB到eNodeB干扰220能够花费在与噪声和干扰相关联的功率之下的与有用信号相关联的功率。
展示eNodeB到eNodeB干扰的CDF均涉及其中DL传输干扰UL传输的情况。最明显的干扰在50%的LPN参与DL传输并且50%参与UL传输(实粗曲线)的情况中产生。该干扰对于50%的LPN参与DL传输并且50%关闭(虚曲线)的情况保持为强,尽管稍微减小,可能减小UL到UL干扰。
然而,在没有一个LPN参与可能干扰UL接收的DL传输的情况下,看到SINR中的大得多的提高。在所有LPN参与UL传输(实平坦曲线)的情况下,SINR得到极大提高。在50%的LPN参与UL传输并且50%的LPN关闭(点线)的情况下,SINR稍微较好。再次,这一额外的提高可能由通过从UE移除大约一半的UL传输来减小UL到UL干扰产生。
在相邻小区具有不同的传输方向的情况下,所产生的UE到UE和eNodeB到eNodeB干扰的问题很明显。因此,公共UL-DL/TDD配置当前被强加在蜂窝网络中以便避免不同的传输方向和随之指定的干扰的类型。然而,这一地毯式方案导致大的低效率。这是因为对于UL传输资源到DL传输资源的需要经常关于地理区域并且关于时间在这样的网络中极大地改变。因此,如果能够减轻干扰问题,使得一个小区将具有与其相邻小区不同的UL-DL/TDD配置,则能够更加有效地使用传输方向的时隙以便适应网络的不同区域中的变化的定向业务负荷。
图4说明了可以由异步传输产生的不同水平的耦合干扰。如在本文使用的,术语“耦合干扰”、“耦合水平”和/或“干扰水平”指代由一个eNodeB/传输点在另一eNodeB/传输点处进行的DL传输的测量。所测量的耦合干扰的水平可以指示在两个eNodeB之间的不同传输方向可能引起的eNodeB到eNodeB和UE到UE干扰的可能性。如在这里使用的,术语“异步业务”指代WWAN400内的传输点当中的不同定向传输。如图4所示,不同水平的耦合干扰可以被调节以便提高定向传输时隙按照允许不同的传输点相对于时间和空间区域适应不同的定性业务需要的方式在WWAN内被分配的效率。
在图4中描绘了三个不同的eNodeB或传输点402、404和406。尽管仅描绘了三个eNodeB,但是可以涉及任意数量的eNodeB。并且,尽管将eNodeB描绘为LPN,但是LPN和MCN的任意组合是可能的。图4的示例中的第一eNodeB402具有由在其中具有多个UE的覆盖区域408限定的相对应的小区408。示例UE414被标记为指示UE在附图中的出现。类似地,第二eNodeB404也具有由在其中具有多个UE的覆盖区域限定的相对应的小区410。同样,第三eNodeB406也具有由在其中具有多个UE的覆盖区域限定的相对应的小区412。
如由实线粗箭头指示的,相对强水平的耦合干扰416存在于第一eNodeB402和第二eNodeB404之间。然而,如由第一虚线细箭头指示的,相对弱水平的耦合干扰418存在于第一eNodeB402和第三eNodeB406之间。此外,如由第二细箭头指示的,另一相对低水平的耦合干扰420也存在于第二eNodeB404和第三eNodeB406之间。
为了确定本身和第二eNodeB404之间的耦合干扰416的水平,第一eNodeB402可以测量耦合信息的单位,进行耦合测量,或者确定第一eNodeB和第二eNodeB404之间的耦合水平。该测量可以基于来自第二eNodeB的DL传输,例如来自DL传输中的一个或多个参考信号的路径增益的测量。小区特定干扰信号、通道状态信息参考信号或者其它信号可以用于测量路径增益。基于这样的测量,可以在小区之间应用传输功率减小,以便在相反的传输方向不使其性能恶化的意义上减小耦合并且使那些小区变得更加隔离。
几种其它类型的测量也是可能的,通过说明而非限制的方式包括接收信号强度的测量、参考信号接收功率(RSRP)测量和参考信号接收质量(RSRQ)测量。可以在第三代合作伙伴计划(3GPP)长期演进(LTE)版本8、版本9、版本10和版本11的一个或多个标准中定义RSRP和RSRQ测量。在整个这一申请中,版本11可以指代在2012年春季由3GPP LTE发布的预先版本。
一旦测量了耦合信息的单位,就可以基于所测量的耦合信息的单位来做出集群确定。在所测量的耦合信息的单位指示第一eNodeB402和第二eNodeB404之间的高水平的耦合干扰416的情况下,可以确定为了UL-DL/TDD配置的目的而集群第一eNodeB和第二eNodeB。在该耦合信息指示相对低水平的耦合干扰的情况下,可以确定第一eNodeB和第二eNodeB足够隔离以便在它们所属于的不同集群中具有不同的UL-DL/TDD配置。
由于相对低水平的耦合干扰,可以基于满足一个或多个条件来做出关于哪些传输点能够被集群在一起以便降低耦合干扰的不期望水平以及哪些传输点能够维持不同的TDD配置的确定。作为示例,第一条件可以是第一eNodeB的性能实质上不被相邻eNodeB的传输方向降级。第二条件可以是相邻eNodeB的传输方向的改变实质上不使第一eNodeB的性能降级。其它条件是可能的。在一些实施例中,可以关于选定的耦合阈值水平值来识别相当大的降级。
耦合阈值水平可以由从耦合信息的单位计算的小区间干扰的水平的估计确定,其中相邻eNodeB的传输功率是已知的。在一些实施例中,可以基于在当UE被调度用于到测量eNodeB的UL传输时的时隙中测量的有用UL信号的平均功率来确定耦合干扰。可以基于来自多个eNodeB的UL测量的平均水平来确定集群阈值。用于选择耦合阈值水平的其它方案也是可能的,如可以认识到的。
第一eNodeB402和第二eNodeB404由于相对低的耦合干扰的水平而被隔离的确定可以导致使用与第二eNodeB的可能不同的UL-DL/TDD配置独立的第一UL-DL/TDD配置来配置第一eNodeB。分配不同的UL-DL/TDD配置的能力能够增加为定向业务调度时隙的效率。相反,在已经确定集群第一eNodeB和第二eNodeB404的情况下,它们能够配置有公共UL-DL/TDD配置。公共UL-DL/TDD配置能够减轻eNodeB到eNodeB和UE到UE干扰,其中指示相对高水平的耦合的测量指示干扰的这些形式可能是个问题。公共UL-DL/TDD配置的协调可以在第一eNodeB和第二eNodeB之间的回程链路422上发生。eNodeB之间的回程链路可以预先存在或者基于该确定而被建立或修改。在某些实施例中,可以通过如在3GPP LTE版本8、版本9、版本10和版本11的一个或多个标准中规定的X2接口来实现协调。可选地,如果一个eNodeB控制几个小区,则它能够在供应商特定协议中实现。
可以在WWAN400内的额外eNodeB之间进行类似的测量,产生多个不同的集群,这些集群可以具有从其中的单个传输点到许多传输点的任何位置。由于在图4的示例中的相对高水平的耦合干扰416,第一eNodeB402和第二eNodeB404被包括在公共集群424中。公共集群中的这两个eNodeB可以被配置有公共UL-DL/TDD配置426(与在图2中提供的表224中的UL-DL/TDD配置#3相对应),对此也可以配置额外的eNodeB,如果它们被分配到相同的集群。
然而,第三eNodeB406具有在第三eNodeB和第一eNodeB402以及第二eNodeB402之间的相对低的耦合干扰418、420。因此,第三eNodeB可以在其自己的集群228中被隔离。因为它在其自己的集群中被隔离,因此第三eNodeB可以具有不同的UL-DL/TDD配置,例如对于在图4中描绘的隔离集群的不同的隔离UL-DL/TDD配置430(与在图2中提供的表224中的UL-DL/TDD配置#4相对应)。
由于图4中的不同UL-DL/TDD配置426、430,在第五时隙/子帧(由数字4指示)处,在与隔离集群428相对应的第三覆盖区域412内的UE参与UL传输432。同时,在分别位于公共集群418的第一覆盖区域408和第二覆盖区域412内的第一eNodeB402和第二eNodeB404参与DL传输434。因而,在这两个集群内的不同定向传输业务需求能够有效地适应不同的UL-DL/TDD配置,而不会导致不可接受的eNodeB到eNodeB和UE到UE干扰问题。此外,这些UL-DL/TDD配置426、430能够接近实时地独立改变,以便适应在能够被持续监控的这两个集群内变化的定向业务需求。
图5描绘了基于传输点之间的耦合水平的多个集群的形成。在整个这一申请中,术语“耦合水平”指代潜在干扰的测量。之前提供了这样的测量的几个非限制性示例。在图5中描绘了五个不同的LPN eNodeB502a-e,具有它们相对应的覆盖区域504a-e。然而,任何数量的eNodeB以及LPN和MCN的组合是可能的。此外,还描绘了在每一对eNodeB之间的耦合水平。在耦合阈值之上的耦合水平由实线粗箭头508、510描绘。不在耦合阈值之上的耦合水平被描绘为细虚线箭头。耦合阈值使用前面讨论的一些可能考虑因素而被设置在eNodeB到eNodeB和UE到UE干扰的可能性在其处可能开始是个问题的预定水平。
在耦合阈值508、510之上的两个耦合水平可以是用于形成具有第一eNodeB502a和第二eNodeB502b的第一集群512和具有第四eNodeB502d和第五eNodeB502e的第二集群514的基础。由于在第三eNodeB502c和任何其它eNodeB之间不存在位于耦合阈值之上的耦合水平,因此能够形成具有单个eNodeB的第三集群516。每一个集群可以具有不同的UL-DL/TDD配置,如由第一集群512的第一UL-DL/TDD配置518(与在图2中提供的表224中的UL-DL/TDD配置#4相对应)、第二集群514的第二UL-DL/TDD配置520(与在图2中提供的表224中的UL-DL/TDD配置#3相对应)和第三集群516的第三UL-DL/TDD配置522(与在图2中提供的表224中的UL-DL/TDD配置#6相对应)指示的。
在第五时隙/子帧(被标记为#4)处描绘了三个集群,其中存在定向业务中的可能冲突,但是干扰问题通过不同集群的形成而得到减轻。可能的冲突也存在于第八和第九子帧(分别被标记为#7和#8)上。如从UE和eNodeB之间的各种箭头能够认识到的,几个不同集群的形成允许WWAN500接近实时地适应不同集群内的不同定向传输业务负荷。不同的业务负荷由分别描绘对于UL和DL传输的不同相对需求的从UE到eNodeB和从eNodeB到UE的不同数量的箭头描绘。示例UE506被标记为指示额外UE在附图中的出现。如可以认识到的,调整各种UL-DL/TDD配置518、520和522以便满足对于UL和DL传输的这些需求。
为了促进UL-DL/TDD配置518、520和522的确定,eNodeB可以通过低时延回程基础设施在彼此之间传递其定向业务需要。集群内的单独eNodeB可以被配置为发送关于业务方向需要的业务方向信息并且接收这样的业务方向信息。可以基于在整个集群中的联合UL和DL需要和/或集群中单独eNodeB处的UL和DL业务需求之间的分配差异来做出关于集群512、514和516的公共UL-DL/TDD配置或者有限组的UL-DL配置的决定。
可以在单独eNodeB处和/或在网络级处做出关于UL-DL/TDD配置的决定。在网络级处做出确定的情况下,用于做出这样的确定的信息可以通过S1接口被传递到网络级,如在3GPP LTE规范的版本8、版本9、版本10和版本11的任何组合中描述的。对于不同集群的UL-DL/TDD配置的确定可以被不断地做出并且独立于彼此而被更新,以便对在单独集群内被监控的动态改变的定向业务负荷做出响应。
图6说明集群的合并以便形成具有可能的子集群的较大集群。与以前一样,图6中描绘了可以代表任意数量的eNodeB以及LPN和MCN的组合的几个不同的LPN eNodeB602a-e,具有其相对应的覆盖区域。此外,还描绘了eNodeB的对之间的耦合水平,其中粗实线箭头604、606、608代表在耦合阈值之上的耦合水平,并且细虚线箭头代表没有在耦合阈值之上的耦合水平。
基于在耦合阈值之上的这些耦合水平604、606、608,可以形成三个集群:第一eNodeB602a和第二eNodeB602b之间的第一集群612;第三eNodeB602c和第四eNodeB602d之间的第二集群614;以及第四eNodeB602d和第五eNodeB602e之间的第三集群616。然而如可以认识到的,第二集群和第三集群共享公共eNodeB,第四eNodeB602d。因此,为了避免可能的eNodeB到eNodeB干扰,第二和第三集群可以被合并(618)。
合并(618)第二集群614和第三集群616的动作相对于以后的后集群布置600b在合并620完成之前导致不同的先集群配置600a。在合并完成之前,仅保留小集群612和大集群622。在某些实施例中,通过示例而非限制的方式,可以对通过诸如S2接口和S1接口的回程基础设施从一个或多个相邻集群传送的eNodeB列表做出响应来做出合并确定。eNodeB列表可以包括集群内的eNodeB的列表,使得能够确定集群之间的一个或多个公共/交叉eNodeB的存在。在一个或多个公共/交叉eNodeB存在于集群之间的情况下,可以做出合并集群的确定。在一个或多个公共/交叉eNodeB不存在的情况下,可以做出保持集群未改变的确定,取决于可能的耦合阈值水平值。
也可以反向地执行合并过程。在一个或多个公共eNodeB不再连接较大集群的部分的情况下,根据更新的测量,该较大的集群可以被划分为较小的集群。相反,在一个或多个先前的公共eNodeB再次按照证明重新连接较大集群是正确的方式变为活动的情况下,应该重新形成集群。
此外,在某些实施例中,可以利用子集群的可能性。尽管第三eNodeB602c和第五eNodeB602e都与第四eNodeB602e共享在耦合阈值之上的耦合水平608、610,但是第三和第五eNodeB之间的另一耦合水平624在耦合阈值之下,如由细虚线箭头指示的。由于第四eNodeB602d仍然被共同共享,因此第三和第四eNodeB属于相同的集群622。然而,由于第三和第五eNodeB之间的低耦合水平,在对于不同的情况的第三和第五eNodeB的配置中的小变化可以是适当的。
通过示例而非限制的方式提供的一个这样的情况可以包括其中第四eNodeB602d被调度为传输几乎空白子帧(ABS)的情况。其它非限制性情况包括其中第四eNodeB被配置为在某些时隙/子帧期间参与波束形成和/或功率减小的情况。在这样的时隙和子帧期间,第三eNodeB602c和第五eNodeB602e由于在它们之间的相对低的耦合水平624而可以参与具有冲突方向的传输。因此,合并的较大集群624能够被划分为子集群,其能够对于与上述情况类似的情况而在子帧上具有不同的UL-DL/TDD配置。图6就第三eNodeB的第一子集群626和第四eNodeB的第二子集群628而言描绘了这样的子集群。尽管图6中的子集群仅包括一个eNodeB,但是单个子集群内的多个eNodeB也是可能的。
图7提供了描绘用于根据一个示例的集群形成的处理700的流程图。该处理包括测量(710)在两个传输点/eNodeB之间的耦合信息的单位。可以基于来自相邻eNodeB的DL传输的一部分在一个eNodeB上进行耦合测量。除了对于本领域中的普通技术人员明显的度量以外,耦合信息还可以采取上面描述的任何形式。接着确定(720)耦合阈值。在为了说明而不是限制的目的提供的一个示例中,可以基于根据来自特定eNodeB的覆盖区域内的eNodeB的UL传输的测量生成的有用信号功率估计来确定耦合阈值。在其它实施例中,耦合阈值通过回程链路被接收或者被从存储器取回。然而,其它方案在这一说明书中被讨论并且对本领域中的普通技术人员是明显的。
处理700通过做出集群确定730来继续。做出集群确定的步骤可以被划分为涉及将耦合信息的单位与耦合阈值进行比较(732)的子例程730。在该子例程内,可以接着做出关于与耦合信息有关的耦合度量,例如在一个非限制性示例中的路径增益,是否在耦合阈值之下的决定734。如果答案为是,则做出测量eNodeB能够在与相邻eNodeB不同的集群中被隔离(736)的确定736。在答案为否的情况下,可以做出eNodeB的对可以被组合在公共集群中的确定738。
在隔离决定734之后,集群确定子例程730完成。方法700接着通过执行740确定736、738中的一个来继续,如由确定子例程指示的,确保测量eNodeB和相邻eNodeB相对彼此在正确的一个或多个集群中。该处理可以接着对于WWAN中的另一对eNodeB继续。
图8提供了说明在由集群产生的SINR的提高和定向业务适应能力之间的折衷的图表800。在该图表中,为了几个不同的耦合阈值的研究,提供关于以dB为单位测量的SINR的CDF。这些CDF对于与上面在图3b中描述的情况类似的情况报告SINR,但是对于此,包括微微小区的更多LPN分布在MCN的覆盖区域中,其中测量来自覆盖区域中的UE的UL传输的SINR。并且,不是在单独LPN的粒度下设置定向业务,而是对于整个集群确定传输方向。
图表800报告对于其中50%的LPN参与UL传输并且50%的集群参与DL传输的情况的研究结果。如在阈值802的表中指示的,对于表中的各种耦合阈值报告关于SINR的CDF。如上面讨论的,耦合阈值可以确定一个传输点是否可以与另一传输点隔离,使得它能够独立地适应位于其覆盖区域内的定向业务需要。
在来自被测量的单位的耦合度量在耦合阈值之上的情况下,eNodeB到eNodeB干扰和/或UE到UE干扰可以被认为足够大而不允许对其进行测量的eNodeB在具有不同定向业务的不同集群中被隔离。相反,在耦合测量的耦合度量在耦合阈值之下的情况下,可以允许eNodeB的对独立地适应它们所经历的定向业务负荷。因此,耦合阈值的确定可以涉及在与许多集群和其中的少量eNodeB相关联的业务适应以及避免eNodeB到eNodeB干扰和/或UR到UR干扰之间的折衷。在图表800及其附随的曲线804、806中例示了这一折衷。
表802指示长虚曲线对于不允许集群的情况报告关于SINR的CDF。(这种情况类似于由图3b中的粗实曲线描绘的情况。)粗实曲线描绘-60dB的最高耦合阈值的结果,该耦合阈值指代所测量的路径增益的值。然而,在可选实施例中,其它耦合度量是可能的。也报告-70dB(短虚曲线)、-80dB(点曲线)和-90dB(实曲线)的耦合阈值的结果,-90dB是最低耦合阈值。
就给定集群中的eNodeB而言,对于-60dB的最高集群阈值在第一曲线804中提供集群尺寸的CDF。第二曲线806提供对于-90dB的最低集群阈值的CDF。升高的集群阈值允许更多的eNodeB在具有较小尺寸的更多集群中与彼此隔离。因而,对于最高集群阈值的第一曲线报告超过90%的集群包括单个eNodeB的CDF。因此,几乎每一个传输点将被允许独立地适应置于其上的定向业务需求。然而,如由图表800指示的,耦合阈值的相对高值并没有很多地提高SINR,这意味着eNodeB到eNodeB干扰和/或UE到UE干扰可能是问题。
在另一极端,-90dB的耦合阈值防止更多的eNodeB到eNodeB干扰和/或UE到UE干扰,将较大的限制置于可以具有不同定向业务的传输点上。结果,图表800指示SINR被极大地提高。然而,与这一低耦合阈值相对应的第二曲线806示出了形成较少集群并且那些集群倾向于具有位于其内的更多eNodeB。例如,仅大约65%的传输点能够独立地适应定向业务需求,使网络整体上不太能够适应这些需求。
因此,如由图8例示的,耦合阈值是优化参数。可以按照竞争需要对于特定WWAN优化该优化参数以便避免在一侧上的eNodeB到eNodeB干扰和/或UE到UE干扰并且适应在另一侧上的定向业务需求。在一些实施例中,可以基于反馈来使这样的优化自动化。这样的反馈可以通过示例而非限制的方式包括关于吞吐量、路径增益测量、SINR、一个或多个传输点处的定向业务负荷和/或一个或多个耦合水平的反馈。
图9提供了例示在集群实现的DL和UL吞吐量中的提高的一对图表902、904。第一图表902提供关于以每秒兆位(Mbps)为单位的分组吞吐量绘制的与各种耦合阈值相对应的几个CDF,该分组吞吐量在来自传输点的DL传输期间在UE处被接收。相反,第二图表904提供关于以Mbps为单位的分组吞吐量绘制的相同耦合阈值的几个CDF,该分组吞吐量在UL传输期间从UE在传输点处被接收。在阈值表906中提供在这两个图表中的各种CDF曲线的各种阈值。
在图表902、904中绘制的CDF报告与上面关于图3和图8讨论的模拟类似的模拟。使用在3GPP R1-120080中规定的文件传输协议(FTP)业务模型参数来进行模拟,其中λD=λU=1,TP文件尺寸=0.5MB,并且时间标度=10ms。如在阈值表906中指示的,实曲线报告其中UL-DL/TDD配置被半静止地改变、在整个网络中根据现有的TDD技术以分钟和小时为单位被测量的情况。
长虚曲线描绘-90dB的耦合阈值的结果,该耦合阈值指代所测量的路径增益的值。然而,在可选实施例中,其它耦合度量是可能的。还报告了-80dB(点曲线)和-70dB(短虚曲线)的耦合阈值的结果。提供混合的虚线和点曲线以便指示如果每一个传输点可以独立地适应定向业务需要而不担心干扰,则在假设情况中分组吞吐量的CDF将是什么。
如可以认识到的,分组吞吐量对于UE处DL接收被增加几乎10Mbps,而对于传输点处UL接收被增加多于5Mbps。因此,所提出的干扰管理的方案能够用于解决eNodeB到eNodeB干扰和/或UE到UE干扰问题。而且,所提出的解决方案可以应用于不同类型的部署情况。
图10描绘根据示例用于在具有不同的UL和DL时隙和自适应异步定向业务资源分配的无线网络中的干扰管理的特定集群方法1000的流程图。该方法可以但不必一定被嵌入在包括非暂态计算机可用介质的计算机程序产品中。计算机可读介质可以具有体现在其中的计算机可读程序代码。计算机可读程序代码可以适合于被执行以便实现用于该方法的指令。
该方法包括在第一eNodeB处测量1010第一eNodeB和相邻eNodeB之间的耦合信息的单位。该耦合信息的单位用于进行集群确定。如在块1020中描绘的,集群确定可以是第一eNodeB和相邻eNodeB属于公共集群的第一确定。相反,集群确定可以是第一eNodeB和相邻eNodeB被隔离的第二确定,这意味着它们可以位于不同的集群中。在第一确定被做出的情况下,方法1000进一步包括使用公共UL-DL配置来配置1030第一eNodeB和相邻eNodeB。在第二确定被做出的情况下,该方法进一步包括使用与和相邻eNodeB有关的可能不同的UL-DL配置独立的第一UL-DL配置来配置1030第一eNodeB。
在某些实施例中,基于耦合信息的单位进行集群确定进一步包括在第一条件和第二条件中的至少一个得到满足的情况下达成第一确定。第一条件是第一eNodeB的性能实质上不被相邻eNodeB的传输方向降级。第二条件是相邻eNodeB的传输方向的改变实质上不使第一eNodeB的性能降级。如果不满足这两个条件的正确组合,则达成第二确定。
在一些实施例中,耦合度量被选择以便特征化耦合信息的单位。耦合阈值还用于确定在耦合信息的单位在耦合度量的耦合阈值处或之上的情况下,第一eNodeB的性能实质上被降级。否则,做出在耦合信息的单位在耦合度量的耦合阈值之下的情况下第一eNodeB实质上没有被降级的确定。
这样的实施例可以进一步包括基于几个不同可能性中的一个来确定耦合阈值。这样的可能性的一个示例是在相邻eNodeB的传输功率已知的情况下根据耦合信息的单位计算的单元间干扰的水平的估计。另一示例是有用UL信号的平均功率。再一示例是上行链路小区间干扰的平均水平,其中公共集群中的所有eNodeB操作为接收上行链路传输。
某些实施例可以包括合并公共集群与第二集群。集群在其中公共集群和第二集群具有共同的至少一个eNodeB的这样的实施例中被合并。该一个或多个eNodeB耦合公共和相邻集群。类似地,某些实施例可以包括将合并的集群划分为子集群。在合并的集群内的一个或多个适应的eNodeB能够适应变化的业务需求使得下面的情况得到满足的情况下,这一划分可以发生。该情况是:在一个或多个适应的eNodeB以及合并的集群中的一个或多个额外的eNodeB之间不再得到如上所述的第一条件和第二条件。当这种情况得到满足时,每一个子集群可以应用不同的UL-DL配置。
方法1000可以进一步包括使UL-DL配置实质上实时地适应在第一eNodeB和相邻eNodeB中的任意一个处的变化的上行链路和下行链路业务需求。适应的UL-DL配置可以属于公共UL-DL配置,其中已经做出上面讨论的第一确定。可以通过低时延回程基础设施在公共集群中的eNodeB之间传送变化的上行链路和下行链路业务需求。可选地,适应的UL-DL配置可以属于第一TDD配置,其中已经做出上面讨论的第二确定。
方法1000还可以进一步包括通过低时延回程基础设施在公共集群中的第一eNodeB和相邻eNodeB之间传送UL和DL业务需要中的至少一个。在一些实施例中,该方法可以进一步包括确定公共UL-DL配置和公共UL-DL配置的有限组的UL-DL配置中的至少一个。可以基于在整个公共集群中的联合UL和DL需要中的至少一个来做出这一确定。也可以通过划分公共集群中的第一eNodeB和相邻eNodeB处的UL和DL业务需求之间的差异来做出确定。
图11说明了在由来自传输/相邻eNodeB1108的DL传输1106照亮的被照亮的/第一eNodeB1104处操作的设备1102。在可选实施例中,该设备可以存在于网络级处,例如在演进型分组核心(EPC)内或者经由通过分组数据网络网关(PDN-GW)连接到EPC的外部网络。根据另一示例,用于适应WWAN中的非对称UL和DL业务负荷的设备可以包括各种模块。这样的模块可以包括耦合测量模块1110、分析模块1120、配置模块1130和通信模块1140。
耦合测量模块1110可以被配置为对从相邻eNodeB到第一eNodeB的DL传输进行耦合测量。分析模块1120可以与耦合测量模块进行通信。此外,分析模块可以被配置为将耦合测量与耦合阈值进行比较。在耦合测量在耦合阈值处或之上的情况下,分析模块确定第一eNodeB和相邻eNodeB被耦合。在耦合测量在耦合阈值之下的情况下,分析模块确定第一eNodeB和相邻eNodeB被隔离。
配置模块1130可以与分析模块1120进行通信。此外,配置模块可以被配置为识别公共UL-DL配置,其中第一eNodeB和相邻eNodeB被耦合。配置模块还可以识别与对于相邻eNodeB的第二UL-DL配置独立的对于第一eNodeB的第一UL-DL配置,其中第一eNodeB和相邻eNodeB被隔离。
在一些实施例中,设备1102还可以包括与配置模块1130进行通信的通信模块1140。通信模块可以被配置为将关于第一eNodeB处的业务方向需要的业务方向信息发送到相邻eNodeB。它也可以被配置为接收关于相邻eNodeB处的业务方向的业务方向信息。
在某些实施例中,可以提供与配置模块1130进行通信的更新模块1132。在第一eNodeB和相邻eNodeB耦合在公共集群中的情况下,更新模块可以被配置为更新公共UL-DL配置以便实质上实时地适应第一eNodeB和相邻eNodeB处的变化的业务方向需要。在第一eNodeB和相邻eNodeB被隔离的情况下,更新模块可以与第二TDD配置独立地更新第一TDD配置以便实时地适应第一eNodeB处的变化的业务方向需要。
在这样的实施例中,也可以提供与分析模块1120进行通信的计算模块1122。计算模块可以被配置为计算耦合阈值。通过就相邻eNodeB的耦合测量和传输功率而言分析耦合度量,可以基于估计DL小区间干扰的水平来执行这一计算。也可以基于与多个用户终端相关联的有用信号功率来执行计算,该多个用户终端与第一eNodeB相关联。此外,除了其它方案以外,还可以在所有eNodeB操作为接收上行链路传输的时间期间基于与多个所部署的eNodeB相关联的UL小区间干扰来进行计算。
此外,一些实施例可以包括与计算模块1122进行通信的优化模块1124。优化模块可以被配置为优化耦合阈值。优化模块内的优化可以基于反馈。反馈可以提供关于吞吐量、路径增益测量、SINR、系统业务负荷和/或小区业务负荷信息连同其它可能性的信息。
一些实施例可以包括与通信模块1140进行通信的合并模块1142。合并模块可以被配置为对来自所耦合的eNodeB的第二集群的eNodeB列表做出响应。该列表可以用于确定合并第二集群以及eNodeB所属的第一集群的需要。关于这样的确定,第一集群可以是公共集群和隔离的第一eNodeB中的任意一个。做出其中eNodeB列表包括第一集群和第二集群共有的交叉eNodeB的这样的确定。否则,合并模块做出保持第一集群不改变的确定。
此外,在一些实施例中,可以包括与通信模块1140进行通信的隔离模块1144。隔离模块1144可以被配置为指示第一集群和属于公共集群的隔离的eNodeB何时能够具有与公共集群的公共UL-DL配置不同的UL-DL配置。具有不同的UL-DL配置的能力可以是由于变化的传输模式。
图12描绘根据示例用于在适应多个eNodeB当中的非对称下行链路传输期间减轻干扰的特定集群方法1200的流程图。该方法可以但不必一定被嵌入在包括非暂态计算机有用介质的计算机程序产品中。计算机可读介质可以具有体现在其中的计算机可读程序代码。计算机可读程序代码可以适合于被执行以便实现对于该方法的指令。在嵌入在计算机程序产品中的实施例中,计算机程序产品可以存在于MCN、LPN和网络级实体中的一个或多个上。
方法1200可以包括确定1210第一eNodeB和至少一个额外的eNodeB中的每一个之间的耦合水平。该方法可以通过集群1220第一eNodeB与来自具有大于耦合阈值的相对应的耦合水平的至少一个额外的eNodeB的任何eNodeB来继续进行。集群可以创建公共集群。公共集群可以包括下列项目中的一个:仅第一eNodeB、第一eNodeB和一个额外的eNodeB、以及第一eNodeB和多个额外的eNodeB。额外的步骤可以涉及为公共集群设置1230公共TDD配置。
在其中公共集群除了第一eNodeB以外还包括至少一个额外的eNodeB的实施例中,这样的实施例可以进一步包括通过回程链路将定向业务信息从公共集群中的第一eNodeB传递到至少一个额外的eNodeB。这样的实施例还可以进一步包括在第一eNodeB处从公共集群中的至少一个额外的eNodeB通过回程链路接收定向业务信息。这样的实施例还可以进一步包括针对公共集群中的变化的定向业务需求来监控公共集群。此外,它们可以包括实质上实时地适应公共集群的公共TDD配置。这些适应可以对与在公共集群外部的任何eNodeB相对应的任何TDD配置独立的变化的定向业务需求做出响应。
可以通过使用关于至少一个额外的eNodeB中的至少一个的传输功率的知识来计算耦合阈值,以便估计小区间干扰的水平。在某些实施例中,可以通过对与公共集群中的多个eNodeB相关联的多个有用信号功率取平均来计算耦合阈值。并且,可以通过对与公共集群中的多个eNodeB相关联的UL小区间干扰的多个水平取平均来计算耦合阈值。可以在公共集群中的所有eNodeB操作为接收上行链路传输的时间期间测量上行链路小区间干扰的这些水平。对于本领域中的普通技术人员来说明显的是,计算耦合阈值的额外方式是可能的。并且,一些实施例可以进一步包括使用关于在至少一个额外的eNodeB处接收的吞吐量和至少一个额外的eNodeB的耦合水平中的一个或两者的反馈来优化耦合阈值。
方法1200还可以进一步包括从在eNodeB的第二集群中的联系eNodeB获取eNodeB的第二集群中的eNodeB的列表。eNodeB的第二集群可以具有任何数量的成员eNodeB,包括单个成员eNodeB。在公共集群和第二集群共享交叉eNodeB的情况下,这样的实施例可以进一步包括为了确定公共TDD配置的目的而合并eNodeB的第二集群与公共集群。
图13说明了根据另一示例用于避免干扰同时适应WWAN中的各种eNodeB处的异步定向业务的设备1300。该设备可以在eNodeB处和/或在网络级处进行操作。在设备内,可以包括几个模块,例如干扰模块1310、隔离模块1320和业务响应模块1330。该设备可以存在于MCN eNodeB、LPN和在网络级处的网络实体中的一个或多个上。
干扰模块1310可以被配置为估计如在第一eNodeB处接收的来自DLeNOdeB的干扰水平。与干扰模块进行通信的隔离模块1320可以被配置为指示该干扰水平足够低以便允许第一eNodeB被隔离。被隔离的第一eNodeB可以适应UL传输,而下行链路eNodeB传输下行链路传输。在干扰水平足够高的情况下,隔离模块可能要求第一eNodeB和下行链路eNodeB聚集在公共集群中以便同步或协调传输方向。与隔离模块进行通信的业务响应模块1330可以被配置为创建TDD配置。在第一eNodeB属于公共集群的情况下,TDD配置可以对与公共集群中的第一eNodeB相关联的eNodeB的定向业务做出响应。在第一eNodeB被隔离的情况下,TDD配置可以独立地对第一eNodeB的定向业务做出响应。
监控模块1332也可以被包括在设备1300中,与业务响应模块1330进行通信。监控模块可以被配置为监控与公共集群中的第一eNodeB相关联的eNodeB的定向业务,其中第一eNodeB属于公共集群。在这样的实施例中,定向业务信息可以通过低时延回程基础设施从公共集群中的至少一个其它eNodeB传送到第一eNodeB。在第一eNodeB被隔离的情况下,监控模块可以仅监控第一eNodeB。监控模块也可以向业务响应模块指示何时改变TDD配置以便实质上实时地适应定向业务中的变化。
设备1300还可以包括与业务响应模块1330进行通信的合并模块1334。合并模块1334可以被配置为包括额外的eNodeB和公共集群的额外集群中的至少一个。可以在确定额外eNodeB和额外集群中的至少一个与公共集群共享公共eNodeB时做出这一添加。此外,该设备可以包括与业务响应模块进行通信的平衡模块。平衡模块可以被配置为调和公共集群内的不同eNodeB处的竞争上行链路和下行链路定向业务需求,以便创建TDD配置。TDD配置可以被创建,以便对竞争业务需求做出响应。
一些实施例可以包括与隔离模块1320进行通信的优化模块1322。优化模块可以被配置为通过监控来自相邻小区的相反传输方向的小区间干扰水平来优化用于确定第一eNodeB是否属于公共集群的耦合阈值。优化模块也可以通过分析一组隔离小区和一组公共小区集群内的业务适应能力和业务需求来优化耦合阈值。
图14提供诸如UE、移动站(MS)、移动无线设备、移动通信设备、平板计算机、手持设备或者其它类型的移动无线设备的移动设备的示例说明。移动设备可以包括被配置为与基站(BS)、eNodeB或者其它类型的WWAN接入点进行通信的一个或多个天线。尽管示出了两个天线,但是移动设备可以具有在一个和四个或更多个天线之间的天线。移动设备可以被配置为使用包括3GPP LTE、微波接入全球互操作性(WiMAX)、高速分组接入(HSPA)、蓝牙、WiFi或其它无线标准中的至少一个无线通信标准进行通信。移动设备可以使用对于每一个无线通信标准的单独天线或者对于多个无线通信标准的共享天线来进行通信。移动设备可以在无线局域网(WLAN)、无线个域网(WPAN)和/或WWAN中进行通信。
图14还提供可以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说明。显示屏可以是液晶显示器(LCD)屏幕或者其它类型的显示屏,例如有机发光二极管(OLED)显示器。显示屏可以被配置为触摸屏。触摸屏可以使用电容、电阻或其它类型的触摸屏技术。应用处理器和图形处理器可以被耦合到内部存储器以便提供处理和显示能力。非易失性存储器端口也可以用于向用户提供数据输入/输出选项。非易失性存储器端口也可以用于扩展移动设备的存储器能力。键盘可以与移动设备集成在一起或者被无线地连接到移动设备以便提供额外的用户输入。也可以使用触摸屏来提供虚拟键盘。
应该理解,已经将在这一说明书中描述的许多功能单元标记为模块,以便更特别地强调它们的实现独立性。例如,模块可以被实现为包括定制VLSI电路或门阵列、现成的半导体的硬件电路,该现成的半导体例如是逻辑芯片、晶体管或其它分立部件。也可以在可编程硬件设备中实现模块,该可编程硬件设备例如是现场可编程门阵列、可编程阵列逻辑、可编程逻辑器件等等。
也可以在用于由各种类型的处理器执行的软件中实现模块。可执行代码的所标识的模块可以例如包括计算机指令的一个或多个物理或逻辑块,其可以例如被组织为对象、过程或函数。然而,所标识的模块的可执行体不需要物理地定位在一起,但是可以包括存储在不同位置中的不同指令,当被在逻辑上连接到一起时,该指令包括模块并且实现对于该模块的规定目的。
实际上,可执行代码的模块可以是单个指令或许多指令,并且可以甚至分布在几个不同的代码段上、在不同的程序当中或者遍及几个存储器设备。类似地,操作数据可以在本文中被标识和说明在模块内,并且可以被体现在任何适当的形式中且被组织在任何适当类型的数据结构内。操作数据可以作为单个数据集被收集,或者可以分布在不同的位置上,包括在不同的存储设备上,并且可以仅作为系统或网络上的电子信号而至少部分地存在。模块可以是无源的或有源的,包括可操作为执行期望功能的代理。
各种技术或其某些方面或部分可以采取被体现在有形介质中的程序代码(即,指令)的形式,该有形介质例如是软盘、CD-ROM、硬驱或任何其它机器可读存储介质,其中当程序代码被装入到诸如计算机的机器中并且由该机器执行时,该机器变为用于实施各种技术的装置。在程序代码在可编程计算机上执行的情况下,计算设备可以包括处理器、由处理器可读的存储介质(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。可以实现或利用本文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)、可重用的控制等等。这样的程序可以在高级面向过程或面向对象的编程语言中实现以便与计算机系统进行通信。然而,程序可以在汇编或机器语言中实现,如果期望。在任何情况下,该语言可以是编译或解释语言,并且与硬件实现进行组合。
在整个这一说明书中对“一个实施例”或“实施例”的提及意味着结合该实施例描述的特定特征、结构或特性包括在本发明的至少一个实施例中。因此,短语“在一个实施例中”或“在实施例中”在整个这一说明书中的不同地方的出现并不一定都指代相同的实施例。
如在本文使用的,多个项目、结构元件、组合元件和/或材料可以为了方便起见而被呈现在公共列表中。然而,这些列表应该被解释为好像该列表的每一个成员被单独地识别为单独和唯一的成员一样。因而,这样的列表的单独成员不应该仅基于其在公共组中的呈现而被解释为相同列表的任何其它成员的实际等同物。此外,可以在本文参考本发明的各种实施例和示例连同其各种部件的可选形式。应该理解,这样的实施例、实例和可选形式不应该被解释为彼此的实际等效形式,而应该被考虑为本发明的单独和自主的表示。
而且,所描述的特征、结构或特性可以在一个或多个实施例中按照任何适当的方式进行组合。在下面的描述中,提供了很多特定的细节,例如材料、扣件、尺寸、长度、宽度、形状等等的示例,以便提供对本发明实施例的彻底理解。然而,相关领域中的技术人员将认识到,可以在没有一个或多个特定细节的情况下,或者在使用其它方法、部件、材料等等的情况下,来实施本发明。在其它实例中,没有详细显示和描述公知的结构、材料或操作,以便避免使本发明的方面难于理解。
尽管前述实例在一个或多个具体的应用中说明了本发明的原理,但是对本领域中的普通技术人员来说将明显的是,可以在不运用创造性能力且不偏离本发明的原理和概念的情况下进行实现的形式、使用和细节上的许多修改。因此,并不意在限制本发明,除了如下面阐述的权利要求那样。

Claims (20)

1.一种用于具有不同的上行链路和下行链路时隙和自适应异步定向业务资源分配的无线网络中的干扰管理和业务适应的方法,包括:
在第一eNodeB处测量所述第一eNodeB和相邻eNodeB之间的耦合信息的单位;
基于所述耦合信息的单位做出集群确定,其中,所述集群确定包括第一确定和第二确定中的一个,所述第一确定是所述第一eNodeB和所述相邻eNodeB属于公共集群的确定,并且所述第二确定是所述第一eNodeB和所述相邻eNodeB被隔离的确定;以及
在已经做出所述第一确定的情况下,使用公共上行链路-下行链路(UL-DL)配置来配置所述第一eNodeB和所述相邻eNodeB,并且在已经做出所述第二确定的情况下,使用第一UL-DL配置来配置所述第一eNodeB,所述第一UL-DL配置与和所述相邻eNodeB有关的潜在不同的UL-DL配置独立。
2.如权利要求1所述的方法,其中,基于所述耦合信息的单位做出所述集群确定进一步包括在第一条件和第二条件中的至少一个得到满足的情况下达成所述第一确定,其中:
所述第一条件是所述第一eNodeB的性能实质上不被所述相邻eNodeB的传输方向降级,以及
所述第二条件是所述相邻eNodeB的所述传输方向的变化实质上不使所述第一eNodeB的性能降级;并且
否则达成所述第二确定。
3.如权利要求2所述的方法,其中,耦合度量被选择为特征化所述耦合信息的单位,并且耦合阈值被使用,以便在所述耦合信息的单位在对于所述耦合度量的所述耦合阈值处和高于所述耦合阈值两者之一的情况下,确定所述第一eNodeB的性能实质上被降级,否则在所述耦合信息的单位低于对于所述耦合度量的所述耦合阈值的情况下,确定所述第一eNodeB的性能实质上没有被降级。
4.如权利要求3所述的方法,进一步包括基于下列项目中的一个来确定所述耦合阈值:
在所述相邻eNodeB的传输功率是已知的情况下,根据所述耦合信息的单位计算出的小区间干扰的水平的估计;
有用UL信号的平均功率;以及
在公共集群中的所有eNodeB操作为接收上行链路传输的情况下,上行链路小区间干扰的平均水平。
5.如权利要求2到4中的任意一项所述的方法,进一步包括下列操作中的一个:
在所述公共集群和第二集群具有耦合所述公共集群和相邻集群的共同的至少一个eNodeB的情况下,合并所述公共集群和所述第二集群;以及
在合并的集群内的至少一个适应的eNodeB能够按照一种方式适应变化的业务需求,使得所述第一条件和所述第二条件中的至少一个不再在所述至少一个适应的eNodeB和所述合并的集群中的至少一个额外的eNodeB之间被获得的情况下,将所述合并的集群划分为子集群,使得每一个子集群能够应用不同的UL-DL配置。
6.如权利要求1到4中的任意一项所述的方法,进一步包括使UL-DL配置实质上实时地适应所述第一eNodeB和所述相邻eNodeB中的任意一个处的变化的上行链路和下行链路业务需求,其中,所述UL-DL配置包括下列项目中的一个:
在已经做出所述第一确定并且所述变化的UL和DL业务需求通过低时延回程基础设施在所述公共集群中的eNodeB之间进行传送的情况下,所述公共UL-DL配置,以及
在已经做出所述第二确定的情况下,所述第一UL-DL配置。
7.如权利要求1到4中的任意一项所述的方法,进一步包括通过低时延回程基础设施在所述公共集群中的所述第一eNodeB和所述相邻eNodeB之间传送上行链路和下行链路业务需要中的至少一个。
8.一种用于适应无线网络中的非对称上行链路和下行链路业务负荷的设备,包括:
用于对从相邻eNodeB到第一eNodeB的下行链路(DL)传输进行耦合测量的单元;
用于对所述耦合测量与耦合阈值进行比较以便在所述耦合测量在所述耦合阈值处和高于所述耦合阈值两者之一的情况下确定所述第一eNodeB和所述相邻eNodeB被耦合,并且在所述耦合测量低于所述耦合阈值的情况下确定所述第一eNodeB和所述相邻eNodeB被隔离的单元;以及
用于在所述第一eNodeB和所述相邻eNodeB被耦合的情况下标识公共上行链路(UL)-DL配置的并且在所述第一eNodeB和所述相邻eNodeB被隔离的情况下标识与对于所述相邻eNodeB的第二UL-DL配置独立的对于所述第一eNodeB的第一UL-DL配置的单元。
9.如权利要求8所述的设备,进一步包括用于完成下列操作中的至少一个的单元:
将关于所述第一eNodeB处的业务方向需要的业务方向信息发送到所述相邻eNodeB;以及
接收关于所述相邻eNodeB处的业务方向需要的业务方向信息。
10.如权利要求8所述的设备,进一步包括用于完成下列操作中的一个的单元:
在所述第一eNodeB和所述相邻eNodeB被耦合在公共集群中的情况下,更新所述公共UL-DL配置以便实质上实时地适应所述第一eNodeB和所述相邻eNodeB二者处的变化的业务方向需要;以及
在所述第一eNodeB和所述相邻eNodeB被隔离的情况下,更新与所述第二UL-DL配置独立的所述第一UL-DL配置以便实质上实时地适应所述第一eNodeB处的变化的业务方向需要。
11.如权利要求8到10中的任意一项所述的设备,进一步包括用于基于下列项目中的至少一个来计算所述耦合阈值的单元:
通过就所述耦合测量和所述相邻eNodeB的传输功率而言分析耦合度量的DL小区间干扰的水平的估计;
与多个用户终端相关联的有用信号功率,所述多个用户终端与所述第一eNodeB相关联;以及
在其中所有eNodeB操作为接收UL传输的时间期间测量的与多个所部署的eNodeB相关联的上行链路小区间干扰。
12.如权利要求11所述的设备,进一步包括用于基于关于吞吐量、耦合测量、信号与干扰加噪声比(SINR)中的至少一个的反馈来优化所述耦合阈值的单元,并且系统和小区业务加载信息中的一个能够用于优化所述耦合阈值的值。
13.如权利要求11所述的设备,进一步包括用于对来自所耦合的eNodeB的第二集群的eNodeB列表做出响应以便确定合并所述第二集群和所述eNodeB所属的第一集群的需要并且否则保持所述第一集群未改变的单元,其中,所述第一集群是所述公共集群和隔离的所述第一eNodeB中的任意一个,其中,所述eNodeB列表包括所述第一集群和所述第二集群共有的交叉eNodeB。
14.如权利要求11所述的设备,进一步包括用于指示所述第二集群和属于所述公共集群的隔离的eNodeB中的至少一个何时能够具有与所述公共集群的所述公共UL-DL配置不同的UL-DL配置的单元。
15.一种用于在适应多个eNodeB当中的非对称DL传输期间减轻干扰的方法,包括:
确定第一eNodeB和至少一个额外的eNodeB中的每一个eNodeB之间的耦合水平;
在相对应的耦合水平大于耦合阈值时集群所述第一eNodeB与来自所述至少一个额外的eNodeB的任意eNodeB以便创建公共集群,其中,所述公共集群能够包括下列项目中的一个:仅所述第一eNodeB、所述第一eNodeB和一个额外的eNodeB、以及所述第一eNodeB和多个额外的eNodeB;并且
设置对于所述公共集群的公共时分双工(TDD)配置。
16.如权利要求15所述的方法,在所述公共集群除了所述第一eNodeB之外还包括所述至少一个额外的eNodeB的情况下,所述方法进一步包括下列操作中的至少一个:
在所述公共集群中通过回程链路将定向业务信息从所述第一eNodeB传送到所述至少一个额外的eNodeB;并且
在所述公共集群中通过所述回程链路在所述第一eNodeB处从所述至少一个额外的eNodeB接收定向业务信息。
17.如权利要求16所述的方法,进一步包括:
针对所述公共集群中的变化的定向业务需求监控所述公共集群;并且
实质上实时地适应对于所述公共集群的所述公共TDD配置以便对与所述公共集群外部的任意eNodeB相对应的任意TDD配置独立的所述变化的定向业务需求做出响应。
18.如权利要求15到17中的任意一项所述的方法,进一步包括通过下列操作来计算所述耦合阈值:
使用关于所述至少一个额外的eNodeB的至少一个eNodeB的至少一个传输功率的知识来估计小区间干扰的水平;
对与所述公共集群中的多个eNodeB相关联的多个有用信号功率取平均;以及
对在其中所述公共集群中的所有eNodeB操作为接收UL传输的时间期间测量的与所述公共集群中的多个eNodeB相关联的UL小区间干扰的多个水平取平均。
19.如权利要求15到17中的任意一项所述的方法,进一步包括:
从eNodeB的第二集群中的联系eNodeB获取所述eNodeB的第二集群中的eNodeB的列表,其中,所述eNodeB的第二集群能够具有任意数量的成员eNodeB,包括单个成员eNodeB;以及
在所述公共集群和所述第二集群共享交叉eNodeB的情况下,为了确定所述公共TDD配置的目的而合并所述eNodeB的第二集群和所述公共集群。
20.如权利要求15到17中的任意一项所述的方法,其中,具有被体现在其中的计算机可读程序代码的非暂态计算机可用介质被进一步配置为存在于MaCro-eNodeB(MCN)、低功率节点(LPN)和网络级实体中的至少一个上。
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