【摘要】：目前，物聯(lián)網(wǎng)正在快速崛起，其發(fā)展的終極目標(biāo)就是把世界范圍內(nèi)的所有機(jī)器像人一樣組成一個巨大的網(wǎng)絡(luò)。而機(jī)器對機(jī)器的通信M2M作為實現(xiàn)機(jī)器網(wǎng)絡(luò)的通信工具和手段，，勢必會引入海量的M2M終端接入網(wǎng)絡(luò)，從而就有大量的M2M業(yè)務(wù)出現(xiàn)，這將會給現(xiàn)有的網(wǎng)絡(luò)帶來巨大的挑戰(zhàn)，致使其接入成功率、系統(tǒng)吞吐量、資源利用率等性能指標(biāo)降低。因此，如何改善上述性能指標(biāo)成為諸多學(xué)者和專家研究的熱點。本文是在LTE系統(tǒng)的基礎(chǔ)上，通過對隨機(jī)接入?yún)f(xié)議、算法和接入方式的深入了解，引入M2M業(yè)務(wù)的隨機(jī)接入，來探究對傳統(tǒng)H2H業(yè)務(wù)帶來的影響。 本文研究的第一個重點是關(guān)于M2M終端和H2H終端競爭隨機(jī)接入所需前導(dǎo)碼的分配問題。首先對現(xiàn)有的前導(dǎo)碼分配方案進(jìn)行了分析，明確了現(xiàn)有方案是無法根據(jù)接入終端數(shù)量的變化作出靈活的調(diào)整，指出了提高資源分配的靈活性是高效利用隨機(jī)接入資源的有效途徑之一。其次從前導(dǎo)碼分配靈活性的角度出發(fā)，提出了一種關(guān)于資源共享的改進(jìn)方案，該方案分為了M2M專用前導(dǎo)碼、H2H專用前導(dǎo)碼和共享的前導(dǎo)碼三部分。其思路是在接入時兩類終端先使用自己的專用前導(dǎo)碼部分，當(dāng)專用前導(dǎo)碼不夠時在根據(jù)接入情況，靈活的使用共享前導(dǎo)碼。最后用數(shù)學(xué)的方法給出分析模型，通過仿真實驗得出了改進(jìn)后的方案能夠有效的提高系統(tǒng)吞吐量，減少了網(wǎng)絡(luò)資源的浪費。 本文研究的第二個重點是關(guān)于M2M終端接入成功率的問題。首先對M2M業(yè)務(wù)的現(xiàn)狀進(jìn)行了分析，發(fā)現(xiàn)了M2M業(yè)務(wù)具有在服務(wù)目標(biāo)和時延敏感度等方面的相似性。由于海量的M2M終端隨機(jī)接入給LTE系統(tǒng)帶來擁塞等影響，這樣勢必會導(dǎo)致LTE系統(tǒng)以及原來的H2H業(yè)務(wù)受到影響。所以，改善M2M終端接入質(zhì)量具有很重要的意義。其次從M2M業(yè)務(wù)具有群組特性和時延敏感度角度出發(fā)，提出了一種基于分組的M2M終端隨機(jī)接入方案，該方案是把具有相似服務(wù)特性的終端分為一組，對于時延敏感度高的終端做特殊處理。最后通過仿真分析得出：該方案相對于傳統(tǒng)方案能有效的提高M(jìn)2M終端的接入成功率，并且，對同一組終端通過多次尋呼的方法可以減少首次未成功接入網(wǎng)絡(luò)的終端數(shù)，有效的保證了系統(tǒng)的性能。
[Abstract]:At present, the Internet of things is rising rapidly. The ultimate goal of its development is to make a huge network like all the machines around the world. As a communication tool and means to realize the machine network, the machine's communication M2M is bound to introduce a large number of M2M terminal access networks, thus a large number of M2M services appear. This will bring great challenges to the existing network and reduce the performance indicators such as the success rate of access, the system throughput and the utilization of resources. Therefore, how to improve the performance indicators has become a hot spot for many scholars and experts. This paper is based on the LTE system, through the depth of random access protocols, algorithms and access methods. In order to explore the impact on traditional H2H services, we introduce random access to M2M services.
The first focus of this study is on the allocation of preamble codes required for the competitive random access of M2M terminals and H2H terminals. First, the existing preamble allocation scheme is analyzed, and the existing scheme is not able to adjust flexibly according to the change of the number of access terminals. It is pointed out that the flexibility of improving resource allocation is efficient. One of the effective approaches to random access resources. Secondly, an improved scheme for resource sharing is proposed, which is divided into three parts: M2M dedicated preamble code, H2H dedicated preamble code and shared preamble code. The idea is that the two classes of terminals use their own private preamble first when they are connected. Part, when the special preamble code is not enough, the shared preamble is used flexibly according to the access situation. Finally, the mathematical method is used to give the analysis model. The improved scheme can effectively improve the system throughput and reduce the waste of network resources.
The second focus of this study is on the success rate of M2M terminal access. First, the status of M2M service is analyzed, and the similarity of M2M service in service target and time delay sensitivity is found. Because the mass M2M terminal random access to the LTE system brings the impact of the plug and so on, it will inevitably lead to the LTE system And the original H2H service is affected. Therefore, it is of great significance to improve the quality of M2M terminal access. Secondly, based on the group characteristics and time delay sensitivity of M2M service, a packet based M2M terminal random access scheme is proposed, which divides the terminals with similar service characteristics into a group and is sensitive to time delay. Finally, the simulation analysis shows that the scheme can effectively improve the success rate of the M2M terminal relative to the traditional scheme, and can reduce the number of terminal number of the first unsuccessful access network by multiple paging to the same terminal, and effectively guarantee the performance of the system.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN929.5

【參考文獻(xiàn)】

相關(guān)期刊論文 前5條

1 陳發(fā)堂;游杰;;一種基于LTE隨機(jī)接入前導(dǎo)檢測的實現(xiàn)方案[J];光通信研究;2011年03期

2 陳曉貝;劉思楊;;3GPP對M2M優(yōu)化技術(shù)的研究進(jìn)展[J];電信網(wǎng)技術(shù);2012年06期

3 遲學(xué)芬;趙瑩瑩;;H2H、M2M混合業(yè)務(wù)串聯(lián)排隊網(wǎng)絡(luò)模型[J];吉林大學(xué)學(xué)報(工學(xué)版);2011年06期

4 戴國華;李寶榮;劉兆元;;M2M產(chǎn)業(yè)的發(fā)展現(xiàn)狀及存在問題[J];移動通信;2008年22期

5 祁慶中;;物聯(lián)網(wǎng)與M2M業(yè)務(wù)的戰(zhàn)略思考[J];中興通訊技術(shù);2010年01期

本文編號：2164468