本文選題：LTE切換算法 + LTE集群切換算法��； 參考：《電子科技大學(xué)》2014年碩士論文

【摘要】：2013年12月4日工業(yè)和信息化部正式向三大運營商發(fā)放了4G牌照,標(biāo)志著中國TD-LTE時代的到來。3GPP分別在R9和R10中定義了LTE廣播組播標(biāo)準(zhǔn),這些標(biāo)準(zhǔn)為LTE廣播組播業(yè)務(wù)奠定了基礎(chǔ)。集群在調(diào)度指揮、保密等方面的優(yōu)勢,使得集群通信在實際生活中發(fā)揮著重要的作用。集群通信方式與多播類似,目前LTE與集群通信相結(jié)合是集群通信領(lǐng)域研究的熱點,本文基于國家重大專項課題“基于TD-LTE公網(wǎng)集群業(yè)務(wù)系統(tǒng)研發(fā)與驗證”,重點研究LTE集群移動性管理的切換過程及其算法研究。本文研究了LTE集群的關(guān)鍵技術(shù),對現(xiàn)有的LTE切換算法、集群切換算法進行了分類總結(jié),比較了LTE切換算法和集群切換算法的異同,比較了LTE集群切換算法和傳統(tǒng)的集群切換算法的異同,為后續(xù)的算法研究奠定了理論基礎(chǔ)。LTE切換過程比較復(fù)雜,大致可以分為切換搜索、切換判決、以及切換執(zhí)行。LTE集群通信“一呼百應(yīng)”等特點,決定了傳統(tǒng)的LTE切換算法將不能很好地適用于LTE集群切換場景。本文在研究LTE集群通信切換過程的基礎(chǔ)之上設(shè)計了三個算法:基于用戶離開方式的搜索算法、LTE集群切換算法以及LTE集群切換用戶傳輸方式優(yōu)化算法�；谟脩綦x開方式的搜索算法是針對傳統(tǒng)切換算法搜索時間TTT(Time To Tiger)采用經(jīng)驗值帶來的問題,設(shè)計出的一種基于用戶離開方式的搜索算法,此算法根據(jù)用戶離開基站的不同方式,將其分為不同的緊迫等級,然后自適應(yīng)的調(diào)整TTT,并通過仿真驗證了此算法在自適應(yīng)調(diào)節(jié)TTT方面的有效性。最后本文還分析了LTE集群用戶的通信特點,闡述了此搜索算法的適用范圍。LTE集群切換算法是在研究了LTE集群通信的特征以及用戶特性之后,設(shè)計出的一種新型的LTE集群切換算法,此算法綜合考慮了信號強度、基站負載、基站類型以及用戶類型,并通過AHP算法確定了各個網(wǎng)絡(luò)因子在話權(quán)用戶和非話權(quán)用戶切換決策中的作用。本文通過仿真分析了此算法的各項性能。LTE集群切換用戶傳輸方式優(yōu)化算法是在研究了PTP和SFN傳輸方式的頻譜效率與用戶數(shù)目關(guān)系之后,設(shè)計出來的一種優(yōu)化算法,此算法摒棄了整個系統(tǒng)的資源最優(yōu)化,而僅考慮目標(biāo)基站的頻率資源最優(yōu)化。此算法能夠自適應(yīng)的根據(jù)UE的信噪比以及目標(biāo)基站多播用戶數(shù)目來決定傳輸方式。本文通過仿真驗證了此算法在節(jié)約目標(biāo)基站頻率資源方面的有效性。
[Abstract]:On December 4, 2013, the Ministry of Industry and Information Technology officially issued 4G licenses to three major operators, marking the arrival of China's TD-LTE era. 3GPP defined the LTE broadcast multicast standards in R9 and R10 respectively, which laid the foundation for LTE broadcast multicast services. Cluster communication plays an important role in real life because of its advantages in command and security. The mode of trunking communication is similar to multicast. At present, the combination of LTE and trunking communication is a hot topic in the field of trunking communication. This paper is based on the project of "Research and verification of trunking service system based on TD-LTE public network". This paper focuses on the handoff process and its algorithm of LTE cluster mobility management. In this paper, the key technologies of LTE cluster are studied, the existing LTE handoff algorithms and cluster handoff algorithms are classified and summarized, and the similarities and differences between LTE handoff algorithms and cluster handoff algorithms are compared. This paper compares the similarities and differences between the LTE cluster handoff algorithm and the traditional cluster handoff algorithm, which lays a theoretical foundation for the subsequent algorithm research. It can be divided into handoff search and handoff decision, which can be divided into two parts: handoff search, handoff decision, etc. As well as the characteristics of handoff execution. LTE trunking communication and so on, it is decided that the traditional LTE handoff algorithm will not be suitable for the LTE cluster handoff scenario. On the basis of studying the handoff process of LTE trunking communication, three algorithms are designed in this paper: one is the search algorithm based on user departure and the other is the optimization algorithm of LTE cluster handoff. The search algorithm based on user departure is designed to solve the problem of TTT(Time to Tiger, a search algorithm based on user departure, which is based on the different ways of users leaving the base station. It is divided into different urgency levels, and then adaptively adjusts the TTT, and the simulation results show that the algorithm is effective in adaptive adjustment of TTT. Finally, this paper analyzes the communication characteristics of LTE cluster users, and expounds the scope of application of the search algorithm. LTE cluster handoff algorithm is after studying the characteristics of LTE cluster communication and user characteristics. A novel LTE cluster handoff algorithm is designed, which considers the signal strength, base station load, base station type and user type. The AHP algorithm is used to determine the role of each network factor in the switching decision between the right user and the non right user. This paper analyzes the performance of the algorithm by simulation. LTE cluster handoff user transmission optimization algorithm is designed after studying the relationship between spectrum efficiency and the number of users in PTP and SFN transmission mode. This algorithm discards the resource optimization of the whole system and only considers the frequency resource optimization of the target base station. The algorithm can adaptively determine the transmission mode according to the SNR of UE and the number of multicast users of the target base station. The effectiveness of this algorithm in saving the frequency resources of the target base station is verified by simulation in this paper.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN929.5

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本文編號：1804712