LTE系统中跟踪区列表管理方法研究

发布时间：2018-12-16 02:26

【摘要】：跟踪移动用户同时减少信令开销(跟踪区更新开销和寻呼开销)是移动通信系统位置管理研究中的重要内容。灵活性和自动重配置是LTE系统两大重要特征,为了克服传统位置区管理的缺陷,在3GPP R8中引入了跟踪区列表的概念,它由多个跟踪区灵活配置组成,用来减少位置管理信令开销。在跟踪区列表管理中,需要平衡跟踪区更新和寻呼两部分信令开销。当跟踪区列表越大,跟踪区更新次数会越少,但是网络寻呼移动用户会在整个跟踪区列表中进行,这会增加网络寻呼开销;当跟踪区列表越小,寻呼开销会减少,但是当移动用户移动时,会造成频繁的跟踪区更新。因此需要一种优化策略来进行跟踪区列表配置,尽可能地减轻网络的负荷以及优化网络性能。本文围绕LTE系统中跟踪区列表设计完成了以下几方面的工作:第一,介绍了位置区管理、LTE系统架构、跟踪区更新信令过程,分析了国内外跟踪区列表研究现状。第二,提出了一种基于跟踪区关联性的跟踪区列表设计方法,它通过从用户历史移动路径中获取各跟踪区之间的关联性并建立各跟踪区的关联表。当跟踪区更新发生时,网络获取在该消息中提供的上次访问跟踪区和用户当前所在跟踪区,结合上述建立的关联表进行跟踪区列表设计。该方法能够随上次访问跟踪区动态分配跟踪区列表,同时也考虑了寻呼过程。第三,提出了一种在LTE系统中移动路径获取方案,它通过给用户配置特殊的跟踪区列表,当用户从一个跟踪区移到其它跟踪区时必定触发跟踪区更新请求,从而收集移动用户的运动路径。第四,在LTE系统协议栈基础上,利用python语音,实现了基于跟踪区关联性的跟踪区列表设计算法模块以及核心代码。第五,搭建了系统硬件和软件平台。并在该平台上运用里斯本城镇网络数据,实验比较了基于跟踪区关联性的跟踪区列表设计方法和目前跟踪区列表研究中简单、有效的方法之一rule of thumb以及3G中位置区最优化设计optimal conventional TA三者在一整天的信令开销。结果显示本方法在减少位置管理信令开销方面相对于两者提升了9.8%和15.2%。
[Abstract]:Tracking mobile users simultaneously reduces signaling overhead (tracking area update overhead and paging overhead) is an important content of mobile communication system location management research. Flexibility and automatic reconfiguration are two important features of LTE system. In order to overcome the defects of traditional location area management, the concept of tracking area list is introduced in 3GPP R8, which is composed of multiple trace regions flexibly configured. Used to reduce location management signaling overhead. In the tracking area list management, it is necessary to balance the tracking area update and paging signaling overhead. When the list of tracking areas is larger, the number of updates will be less, but the network paging mobile users will be in the entire list of tracking areas, which will increase the network paging overhead; When the list of trace areas is smaller, the paging overhead will be reduced, but when the mobile user moves, the tracking area will be updated frequently. Therefore, an optimization strategy is needed to configure the tracking area list to minimize the network load and optimize the network performance. In this paper, the design of tracking area list in LTE system has completed the following aspects: first, the location area management, LTE system architecture, tracking area update signaling process are introduced, and the status quo of tracking area list research at home and abroad is analyzed. Secondly, a tracking region list design method based on tracking region correlation is proposed, which obtains the correlation between each trace area from the user's historical moving path and establishes the association table of each tracking area. When the trace region update occurs, the network acquires the last access trace area provided in the message and the current trace area where the user is located. This method can dynamically assign the tracking area list with the last access to the trace area, and also considers the paging process. Thirdly, a mobile path acquisition scheme in LTE system is proposed. By configuring a special list of trace areas, a tracking area update request is triggered when the user moves from one tracking area to another. In order to collect the mobile user's movement path. Fourthly, on the basis of LTE system protocol stack, using python voice, the algorithm module and core code of tracking area list design based on tracking region correlation are implemented. Fifth, build the system hardware and software platform. Based on the Lisbon urban network data, this paper compares the design method of tracking area list based on the correlation of tracking area and the simplicity of the current research on tracking area list. One of the effective methods is rule of thumb and the optimal design of location area in 3G. The results show that the proposed method can reduce the overhead of location management signaling by 9.8% and 15.2% compared with both.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN929.5

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