CN1976494A - 操作无线通信网络的方法、终端和基站 - Google Patents

操作无线通信网络的方法、终端和基站 Download PDF

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CN1976494A
CN1976494A CNA2006101468495A CN200610146849A CN1976494A CN 1976494 A CN1976494 A CN 1976494A CN A2006101468495 A CNA2006101468495 A CN A2006101468495A CN 200610146849 A CN200610146849 A CN 200610146849A CN 1976494 A CN1976494 A CN 1976494A
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terminal
data
base station
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transmission conditions
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德尼·鲁费
让·克洛德·费伊
韦罗妮克·卡普德维埃尔勒
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Alcatel Lucent SAS
Alcatel Lucent NV
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  • General Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
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Abstract

本发明涉及一种操作无线通信网络(100)的方法，其中通过无线链路(15)将数据从所述网络(100)的基站(10)发送到终端(20)。本发明方法的特征在于，根据所述无线链路(15)的当前数据传输条件将需要从所述基站(10)发送到所述终端(20)的数据提前发送到所述终端并存储在所述终端(20)的高速缓冲存储器(21)内。

Description

操作无线通信网络的方法、终端和基站
相关申请的交叉引用
本发明基于在先申请EP05292528.6，在此通过引用包含其内容。
技术领域
本发明涉及一种操作无线通信网络的方法，其中通过无线链路将数据从所述网络的基站发送给终端。
本发明还涉及一种能够通过无线链路从无线通信网络的基站接收数据的终端，以及一种基站。
背景技术
上述类型的方法和系统根据现有技术是已知的并且其存在一些缺点，例如，支持基站和终端之间的无线链路的无线覆盖存在不连续性。这种不连续性可能造成例如基站和终端之间数据传输的中断，并且因此是极不希望出现的。
特别地，语音服务和其他实时服务在载波干扰比(C/I)降低时需要更多的可用无线资源。如果在这种情形下不限制实时业务，到终端的数据传输(特别地，其可能是非实时数据传输)会受到影响或者甚至中断。
目前已经提出了几种方法来解决现有技术的上述缺点。
首先，已经提出了诸如空间时间编码之类的先进无线技术或基于智能天线并且利用空间分集优点的传输方法。这些解决方案复杂、成本高、并且其效率尚未在实际的案例中得到证实。
第二种解决无线覆盖不连续性问题的方法基于进行致密的无线部署，但这并不理想，原因是增加了网络成本。
另一种方法基于呼叫准入控制(CAC)机制，其不利地限制了相应无线通信网络的可能用户的数量。
此外另一个现有技术方法包括使用诸如“分组视频(Packet Video)”之类的可升级的编解码器。然而，如果无线传输条件差，则特别地，这样发送的视频数据质量会严重降低，并且在最差的情况下甚至将只能发送语音数据，因此基于可升级的编解码器的解决方案并不能保证无缝服务。
发明内容
因此，本发明的目的是提供一种操作无线通信网络的改进的方法，其与现有技术的解决方案相比具有更好的服务可用性和可靠性。
根据本发明，通过以下步骤实现所述目的：根据所述无线链路的当前数据传输条件将需要从所述基站发送到所述终端的数据提前发送到所述终端，并且将所述已经提前发送的数据存储在所述终端的高速缓冲存储器内。
因此本发明方法允许在终端的高速缓存内提前存储将来可能由终端或其用户分别使用的数据。优选地，只要所述无线链路的当前数据传输条件对这样的数据传输来说是足够的，就执行所述提前传输。
本发明解决方案通过将数据提前从基站发送到终端，保证了只要无线链路可操作，即终端的无线覆盖不存在不连续情况，就向所述终端发送最大数量的数据。如果将来出现任何不连续情况，根据本发明操作的终端在其高速缓存内也已有相当数量之前发送的数据，可供不连续情况期间使用。
这样，特别地如果终端为移动终端，采用本发明的方法可以分别降低基于到终端的所述数据传输或从高速缓冲存储器到终端的用户的数据传送的任意服务发生中断的可能性。尽管具有间断的连通性，但终端或其用户能够有利地体验到无缝服务。
根据本发明的一个高级实施例，以所述数据传输的最大可能数据速率发送提前向所述终端发送的数据。因此，填充终端的高速缓冲存储器所需的时间被缩减到最短，而且此外，还降低了填充所述高速缓冲存储器期间经历无线覆盖不连续性的可能性。
根据本发明的一个更有利的实施例，用于提前向所述终端发送数据的数据速率是根据所述基站和所述终端之间的无线链路的载波干扰比(C/I)选定的。这样，在载波干扰比相对较高的情况下，数据传输可以以相对较高的数据速率进行，而在载波干扰比相对较低的情况下，基站与终端之间的数据传输可以采用相对较低的数据速率。
本发明的另一个非常有利的实施例提出，如果最大可能数据速率低于预定的阈值，则不从所述基站向所述终端发送数据。这保证了避免以极低的数据速率进行数据传输，由于通常的协议开销等，那将是效率很低的。
根据本发明的另一个有利的实施例，如果所述基站和所述终端之间的所述无线链路的载波干扰比低于预定的阈值，则不从所述基站向所述终端发送数据。
根据本发明的又一个有利的实施例，从所述基站到所述终端的数据传输根据所述终端的所述高速缓冲存储器的填充状态进行，尤其如果终端的高速缓冲存储器已满则允许分别地中断数据传输或降低数据速率。另一方面，根据本发明方法的这一变型，还可以在终端的高速缓冲存储器未充分填充时提高用于进行到终端的数据传输的数据速率。还可以强制性地以很低的数据速率进行数据传输，以避免终端或其高速缓冲存储器分别耗尽。
本发明另一个有利的实施例提出，所述终端根据所述基站和所述终端之间的所述无线链路的当前数据速率和/或载波干扰比使用之前已经存储在其高速缓冲存储器内的数据。相应地，如果当前数据速率或载波干扰比降低，终端可以从其高速缓冲存储器内取出数据，等等。
根据本发明的另一个有利的实施例，所述终端通过无线测量，特别地通过分析从所述基站接收到的无线信号，来检测数据传输条件。终端有利地将关于所述数据传输条件的信息发送给所述基站，这例如可以使得所述基站调整当前用于从基站到终端的数据传输的数据速率。
优选地，根据本发明的另一个实施例，定期执行所述检测数据传输条件和/或向所述基站发送关于所述数据传输条件的信息的步骤。
本发明的另一个实施例提出，根据数据传输条件，特别地根据各个区域中当前可能的最大数据速率，将所述基站的无线覆盖区域划分成若干区域。
本发明对于无线覆盖区域的划分，例如可以分别根据离基站或离所述基站的天线的距离，或根据影响无线覆盖的其他因素来进行。也可以根据由终端或其他网络元件确定的当前数据传输条件动态地划分无线覆盖区域。
所述划分可以用于例如以非常简单的方式控制针对基站与终端之间的数据传输而选择的数据速率。
根据本发明的终端给出了针对本发明目的的进一步的解决方案。
所述本发明的终端能够通过无线链路从无线通信网络的基站接收数据。终端有利地配备了高速缓冲存储器并且进一步配置为根据所述无线链路的当前数据传输条件提前接收需要从所述基站发送到所述终端的数据，并将所述提前接收到的数据存储在所述高速缓冲存储器内。
优选地，所述终端为移动终端。
根据本发明的基站给出了针对本发明目的进一步的解决方案。
附图说明
下文的具体描述参照附图说明了本发明的其他优点和特征，其中：
图1示出了采用本发明的第一个实施例的典型网络情形；以及
图2示出了本发明的一个实施例的简化流程图。
具体实施方式
图1示出了包括基站10和移动终端20的无线通信网络100，其能够通过无线链路15在基站10和移动终端20之间交换数据。
图1还示出了基站10的无线覆盖区域50。所述无线覆盖区域50被划分为多个区域51、52和53，其中每个区域的特征在于特定的数据传输条件，诸如最大数据传输速率或载波干扰比。
例如，与基站10相邻的区域51由于接近基站10，其特征是数据传输速率相对较高。
相比而言，区域52不支持区域51中所给出的这种高数据传输速率。下一个区域即区域53当前包含移动终端20，其特征是在基站10的整个无线覆盖区域50中具有最低可能数据传输速率。
为了提供基于到终端20的所述数据传输的无缝服务，特别地在所述移动终端20在数据传输速率极低的区域53内移动的时段期间，根据本发明，将需要从所述基站10向所述终端20发送的用于提供各项服务的数据提前发送给所述终端20，并且将其存储在所述终端20的高速缓冲存储器21内。
所述到终端20的提前传输有利地根据当前数据传输条件进行。即如果终端20当前处于区域51(其特征在于相对较高的载波干扰比)内，则所述提前传输可以以相对较高的数据速率进行。
如果终端20当前处于不提供足够数据速率的区域53内，则不向终端发送数据，等等。
相应地，本发明方法使得能够优选地在终端20在移动通过可用数据传输速率相对较高的区域51、52的时段期间填充终端20的高速缓冲存储器21。
然而，当终端20离开区域51、52并移入数据传输速率相对较低的区域53时，所述终端20可以使用之前已经存储在其高速缓冲存储器21内的数据，以维持向所述终端20的用户的数据传送，由此即使在无线覆盖中出现任何可能的不连续情况也可向用户提供无缝服务。
下文参考图2的流程图给出本发明方法的一个更详细的例子。
在步骤200中，终端20通过无线测量，特别地通过分析终端20接收到的从基站10发出的无线信号，来检测数据传输条件。
随后在步骤210中，终端20将关于所述数据传输条件的信息发送给所述基站10。
关于所述数据传输条件的所述信息例如可以包括当前由所述终端20根据在步骤200中执行的无线测量计算得出的载波干扰比。
根据步骤220，基站10调整用于所述基站10和所述终端20之间的数据传输的数据传输速率。
在本例中，转发给基站10的关于所述数据传输条件的信息表明(与图1示出的情况相对比)终端20当前处于区域51中，该区域的特征在于相对较高的载波干扰比，该相对较高的载波干扰比支持从基站10到终端20的数据传输的相对较高的数据速率。
相应地，在步骤220中，基站10选择相对较高的数据速率用于到终端20的进一步数据传输。
这有利地允许在终端的高速缓冲存储器21内提前存储需要发送给终端20的大量数据。存储在终端20的所述高速缓冲存储器21内的数据稍后可以由终端使用，特别地在可用数据速率很低的情况下使用，参见图1；或者在基站10和终端20之间根本无法进行数据传输的情况下使用。这样，通过使用高速缓存数据，就可以弥补无线覆盖的不连续性，并且所述终端20的用户能够体验到向终端20的无缝数据传送。
因此，即使由于在无线通信网络100的无线覆盖区域50内存在无线覆盖的不连续性而导致基站10和终端20之间的间断连通性，也可以通过采用根据本发明的方法保证无缝服务体验。
本发明对基站10的无线覆盖区域50的划分，允许很简单地确定进行用于填充终端的高速缓冲存储器21的数据传输的时段。
根据本发明的一个非常有利的实施例，定期执行图2流程图中的上述步骤200、210，以保证正确评估当前无线传输条件并将其用于调整数据速率。
本发明方法的另一个有利的实施例提出，根据终端20的高速缓冲存储器21的填充状态进行从基站10到终端20的数据传输。
如果根据用于到终端20的数据传输的最大数据速率和估计的无线覆盖不连续性程度适当选择了高速缓冲存储器21的大小，则在无线覆盖区域50内移动的终端20最有可能通过使用提前向终端20发送数据的本发明方法，及时地重新填充其高速缓存，这样终端的高速缓存耗尽就基本不可能出现了。
这样，通过采用诸如大型高速缓冲存储器21之类的相对简单的硬件和在高数据速率期间以高效方式填充高速缓存的本发明方法，可以向终端20的用户提供更高的服务可用性和可靠性。
此外，无线通信网络100的运营商也会从本发明方法的应用中获益，原因是蜂窝能力得到提高，并且不需要额外的复杂硬件或其他不利措施，诸如可升级的编解码器或呼叫准入控制机制。
尽管上文参照基站10说明了本发明方法的操作，但是任何能够向终端20发送或转发数据的网络元件都可以采用本发明方法。
本发明方法可以有利地应用于UMTS(通用移动通信系统)无线接入网、UTRAN(UMTS陆地无线接入网)、WiMax(微波接入全球互通)系统，并且可以一般地应用于任何其他无线接入网。

Claims (16)

1.一种操作无线通信网络的方法，其中通过无线链路将数据从所述网络的基站发送到终端，其特征在于根据所述无线链路的当前数据传输条件将需要从所述基站发送到所述终端的数据提前发送到所述终端，并且将所述已经提前发送的数据存储在所述终端的高速缓冲存储器内。
2.根据权利要求1的方法，其中以所述数据传输的最大可能数据速率发送提前向所述终端发送的所述数据。
3.根据权利要求1的方法，其中用于提前向所述终端发送数据的数据速率，是根据所述基站和所述终端之间的所述无线链路的载波干扰比C/I选定的。
4.根据权利要求1的方法，其中如果最大可能的数据速率低于预定的阈值，则不从所述基站向所述终端发送数据。
5.根据权利要求1的方法，其中如果所述基站和所述终端之间的所述无线链路的当前载波干扰比C/I低于预定的阈值，则不从所述基站向所述终端发送数据。
6.根据权利要求1的方法，其中根据所述终端的所述高速缓冲存储器的填充状态，执行从所述基站到所述终端的数据传输。
7.根据权利要求1的方法，其中所述终端根据所述基站和所述终端之间的所述无线链路的当前数据速率和/或载波干扰比C/I使用之前已经存储在其高速缓冲存储器内的数据。
8.根据权利要求1的方法，其中所述终端通过无线测量，特别地通过分析从所述基站接收到的无线信号，来检测数据传输条件。
9.根据权利要求8的方法，其中所述终端将关于所述数据传输条件的信息发送给所述基站。
10.根据权利要求8的方法，其中定期执行所述检测数据传输条件的步骤和/或向所述基站发送关于所述数据传输条件的信息的步骤。
11.根据权利要求8的方法，其中根据数据传输条件，特别是根据当前可能的最大数据速率，将所述基站的无线覆盖区域划分成若干区域。
12.根据权利要求8的方法，其中所述终端为移动终端。
13.一种能够通过无线链路从无线通信网络的基站接收数据的终端，其具有高速缓冲存储器并且其特征在于所述移动终端配置为根据所述无线链路的当前数据传输条件提前接收需要从所述基站发送到所述终端的数据，并且将所述提前接收到的数据存储在所述高速缓冲存储器内。
14.根据权利要求13的终端，其中所述终端为移动终端。
15.根据权利要求13的终端，其中所述终端配置为执行根据权利要求1-12中任一项所述的方法。
16.一种基站，其配置为执行根据权利要求1-12中任一项所述的方法。
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