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  本文選題：異構(gòu)無線網(wǎng)絡(luò) + 垂直切換框架　； 參考：《南京理工大學(xué)》2014年碩士論文

【摘要】：異構(gòu)無線網(wǎng)絡(luò)融合是未來網(wǎng)絡(luò)的一個重要發(fā)展趨勢。在異構(gòu)無線網(wǎng)絡(luò)環(huán)境下,用戶可以充分利用不同無線網(wǎng)絡(luò)的技術(shù)優(yōu)勢,獲得"Always Best Connection, ABC"。但是這些不同類型無線網(wǎng)絡(luò)在接入技術(shù)、覆蓋范圍、業(yè)務(wù)類型等方面有很大不同,使得傳統(tǒng)的水平切換技術(shù)已經(jīng)無法解決異構(gòu)無線網(wǎng)絡(luò)的移動性管理問題,因此垂直切換技術(shù)正是為了解決移動終端在異構(gòu)無線網(wǎng)絡(luò)環(huán)境中無縫切換而誕生的網(wǎng)絡(luò)切換技術(shù)。 本文研究和設(shè)計了網(wǎng)絡(luò)垂直切換框架以及垂直切換判決算法： 1、改進了基于MIH的垂直切換框架。本文在IEEE802.21MIH的基礎(chǔ)上,設(shè)計了一個垂直切換管理模塊,實現(xiàn)終端狀態(tài)的感知以及網(wǎng)絡(luò)QoS評分的計算、收集和分享。 2、設(shè)計了一種終端控制、網(wǎng)絡(luò)輔助的垂直切換判決算法。本文在垂直切換框架的基礎(chǔ)上,提出基于網(wǎng)絡(luò)得分預(yù)測和模糊邏輯優(yōu)化的垂直切換判決算法(NP-FVHD),該算法針對四種不同的業(yè)務(wù)類型分別計算網(wǎng)絡(luò)QoS得分,并利用一階單變量灰色預(yù)測模型GM(1,1)預(yù)測未來網(wǎng)絡(luò)QoS得分；利用終端移動速度和預(yù)計駐留時間進行網(wǎng)絡(luò)預(yù)篩選和預(yù)判決；根據(jù)網(wǎng)絡(luò)QOS得分的真實值、預(yù)測值和終端電池電量做出網(wǎng)絡(luò)的垂直切換判決。另外,本文提出了一種增加用戶體驗質(zhì)量反饋的建議。 論文針對上述研究開展了實驗驗證：首先,定量分析了垂直切換框架的性能,分析結(jié)果表明,框架能夠有效地降低切垂直換判決的時延和終端電池電量的消耗；然后,設(shè)計了三種不同的網(wǎng)絡(luò)QoS變化仿真場景來驗證NP-FVHD算法的性能,實驗結(jié)果表明,本文提出的NP-FVHD能夠有效地增加網(wǎng)絡(luò)QoS評價的準(zhǔn)確性,并且能有效減少不必要的網(wǎng)絡(luò)切換,降低“乒乓效應(yīng)”,延長終端的續(xù)航時間。
[Abstract]:Heterogeneous wireless network fusion is an important trend in the future. In heterogeneous wireless network environment, users can make full use of the technological advantages of different wireless networks to obtain "Always Best connection, ABCs". However, these different types of wireless networks are very different in access technology, coverage range, service type and so on, which makes the traditional horizontal handover technology can not solve the mobility management problem of heterogeneous wireless networks. Therefore, vertical handoff technology is a network handover technology which is born to solve the seamless handoff of mobile terminal in heterogeneous wireless network environment. In this paper, the vertical handoff framework and the vertical handoff decision algorithm are studied and designed. 1. The vertical handoff framework based on MIH is improved. On the basis of IEEE 802.21 MIH, a vertical handover management module is designed to realize terminal state perception and network QoS score calculation, collection and sharing. 2. A terminal control is designed. Network aided vertical handoff decision algorithm. Based on the vertical handoff framework, this paper proposes a vertical handoff decision algorithm (NP-FVHD) based on network score prediction and fuzzy logic optimization, which calculates the QoS score of the network for four different traffic types. The first order single variable grey prediction model GM (1 / 1) is used to predict the future network QoS scores, the terminal moving speed and the estimated residence time are used to pre-filter and pre-judge the network, and according to the true value of the network QOS score, The prediction value and the terminal battery quantity are used to determine the vertical switching of the network. In addition, this paper puts forward a suggestion to increase the quality feedback of user experience. Firstly, the performance of the vertical switching frame is quantitatively analyzed. The results show that the framework can effectively reduce the time delay of the tangential vertical switching decision and the power consumption of the terminal battery. Three different network QoS simulation scenarios are designed to verify the performance of NP-FVHD algorithm. Experimental results show that NP-FVHD proposed in this paper can effectively increase the accuracy of network QoS evaluation and reduce unnecessary network switching. Reduce "ping-pong effect" and extend terminal life.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN92

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 于波;于東;賈軍營;;一種支持IMS異構(gòu)網(wǎng)絡(luò)的垂直切換算法[J];計算機工程;2012年22期

2 王海濤;付鷹;;異構(gòu)網(wǎng)絡(luò)融合——研究發(fā)展現(xiàn)狀及存在的問題[J];數(shù)據(jù)通信;2012年02期

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本文編號：2095196