【摘要】：跟蹤移動(dòng)用戶同時(shí)減少信令開銷(跟蹤區(qū)更新開銷和尋呼開銷)是移動(dòng)通信系統(tǒng)位置管理研究中的重要內(nèi)容。靈活性和自動(dòng)重配置是LTE系統(tǒng)兩大重要特征,為了克服傳統(tǒng)位置區(qū)管理的缺陷,在3GPP R8中引入了跟蹤區(qū)列表的概念,它由多個(gè)跟蹤區(qū)靈活配置組成,用來減少位置管理信令開銷。在跟蹤區(qū)列表管理中,需要平衡跟蹤區(qū)更新和尋呼兩部分信令開銷。當(dāng)跟蹤區(qū)列表越大,跟蹤區(qū)更新次數(shù)會(huì)越少,但是網(wǎng)絡(luò)尋呼移動(dòng)用戶會(huì)在整個(gè)跟蹤區(qū)列表中進(jìn)行,這會(huì)增加網(wǎng)絡(luò)尋呼開銷;當(dāng)跟蹤區(qū)列表越小,尋呼開銷會(huì)減少,但是當(dāng)移動(dòng)用戶移動(dòng)時(shí),會(huì)造成頻繁的跟蹤區(qū)更新。因此需要一種優(yōu)化策略來進(jìn)行跟蹤區(qū)列表配置,盡可能地減輕網(wǎng)絡(luò)的負(fù)荷以及優(yōu)化網(wǎng)絡(luò)性能。本文圍繞LTE系統(tǒng)中跟蹤區(qū)列表設(shè)計(jì)完成了以下幾方面的工作:第一,介紹了位置區(qū)管理、LTE系統(tǒng)架構(gòu)、跟蹤區(qū)更新信令過程,分析了國(guó)內(nèi)外跟蹤區(qū)列表研究現(xiàn)狀。第二,提出了一種基于跟蹤區(qū)關(guān)聯(lián)性的跟蹤區(qū)列表設(shè)計(jì)方法,它通過從用戶歷史移動(dòng)路徑中獲取各跟蹤區(qū)之間的關(guān)聯(lián)性并建立各跟蹤區(qū)的關(guān)聯(lián)表。當(dāng)跟蹤區(qū)更新發(fā)生時(shí),網(wǎng)絡(luò)獲取在該消息中提供的上次訪問跟蹤區(qū)和用戶當(dāng)前所在跟蹤區(qū),結(jié)合上述建立的關(guān)聯(lián)表進(jìn)行跟蹤區(qū)列表設(shè)計(jì)。該方法能夠隨上次訪問跟蹤區(qū)動(dòng)態(tài)分配跟蹤區(qū)列表,同時(shí)也考慮了尋呼過程。第三,提出了一種在LTE系統(tǒng)中移動(dòng)路徑獲取方案,它通過給用戶配置特殊的跟蹤區(qū)列表,當(dāng)用戶從一個(gè)跟蹤區(qū)移到其它跟蹤區(qū)時(shí)必定觸發(fā)跟蹤區(qū)更新請(qǐng)求,從而收集移動(dòng)用戶的運(yùn)動(dòng)路徑。第四,在LTE系統(tǒng)協(xié)議�；A(chǔ)上,利用python語音,實(shí)現(xiàn)了基于跟蹤區(qū)關(guān)聯(lián)性的跟蹤區(qū)列表設(shè)計(jì)算法模塊以及核心代碼。第五,搭建了系統(tǒng)硬件和軟件平臺(tái)。并在該平臺(tái)上運(yùn)用里斯本城鎮(zhèn)網(wǎng)絡(luò)數(shù)據(jù),實(shí)驗(yàn)比較了基于跟蹤區(qū)關(guān)聯(lián)性的跟蹤區(qū)列表設(shè)計(jì)方法和目前跟蹤區(qū)列表研究中簡(jiǎn)單、有效的方法之一rule of thumb以及3G中位置區(qū)最優(yōu)化設(shè)計(jì)optimal conventional TA三者在一整天的信令開銷。結(jié)果顯示本方法在減少位置管理信令開銷方面相對(duì)于兩者提升了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.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN929.5

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