本文選題：異構(gòu)無線網(wǎng)絡(luò) + 垂直切換　； 參考：《哈爾濱工程大學(xué)》2014年碩士論文

【摘要】：隨著通信技術(shù)的快速發(fā)展和網(wǎng)絡(luò)接入技術(shù)的不斷提高,多種無線網(wǎng)絡(luò)同時(shí)存在。網(wǎng)絡(luò)間既彼此競(jìng)爭(zhēng)又互相補(bǔ)充,構(gòu)成了異構(gòu)無線融合網(wǎng)絡(luò)。其中,以WLAN與3G網(wǎng)絡(luò)融合最具代表性。WLAN網(wǎng)絡(luò)具有高帶寬與低覆蓋的特點(diǎn),3G網(wǎng)絡(luò)具有低帶寬與高覆蓋的特點(diǎn),因此,3G與WLAN的融合能夠揚(yáng)長避短,充分發(fā)揮各自的優(yōu)勢(shì)。如何使用戶在復(fù)雜的異構(gòu)接入網(wǎng)絡(luò)之間進(jìn)行無縫漫游,是異構(gòu)融合網(wǎng)絡(luò)垂直切換技術(shù)重點(diǎn)研究內(nèi)容。因此,本文通過對(duì)3G與WLAN兩個(gè)具有代表性的無線網(wǎng)絡(luò)融合為例,對(duì)異構(gòu)融合網(wǎng)絡(luò)垂直切換算法進(jìn)行分析和研究。首先,本文對(duì)異構(gòu)網(wǎng)絡(luò)融合的體系架構(gòu)、網(wǎng)絡(luò)垂直切換基本概念及目前常用的垂直切換算法進(jìn)行了簡(jiǎn)要的介紹,并針對(duì)典型的網(wǎng)絡(luò)垂直切換算法進(jìn)行了對(duì)比分析與歸納總結(jié)。其次,本文基于3G和WLAN重疊覆蓋的網(wǎng)絡(luò)融合架構(gòu),提出一種基于代價(jià)函數(shù)的聯(lián)合網(wǎng)絡(luò)切換判決算法,并建立一個(gè)網(wǎng)絡(luò)垂直切換性能的評(píng)估模型,用于客觀評(píng)價(jià)垂直切換算法的性能。該算法通過綜合考慮網(wǎng)絡(luò)帶寬、平均接收信號(hào)強(qiáng)度和應(yīng)用滿意度因子,設(shè)計(jì)具有多個(gè)參數(shù)的代價(jià)函數(shù),用以量化網(wǎng)絡(luò)的性能。仿真結(jié)果表明,基于代價(jià)函數(shù)的聯(lián)合網(wǎng)絡(luò)切換算法相比傳統(tǒng)的基于滯后余量的網(wǎng)絡(luò)切換算法,能夠更有效的降低網(wǎng)絡(luò)切的乒乓效應(yīng),為用戶提供更高的QoS保障。最后,本文針對(duì)融合網(wǎng)絡(luò)的負(fù)載均衡問題,提出了一種基于群體博弈理論的網(wǎng)絡(luò)垂直切換算法。文中給出一種面向群體用戶的網(wǎng)絡(luò)接入選擇實(shí)現(xiàn)機(jī)制,該機(jī)制根據(jù)用戶在網(wǎng)絡(luò)中獲得的效用函數(shù),采用非合作博弈方法建立網(wǎng)絡(luò)效用模型,并證明該非合作博弈滿足勢(shì)博弈條件。仿真結(jié)果比較了 3G與WLAN融合場(chǎng)景下的各群體與接入網(wǎng)絡(luò)在非合作博弈模型中的收益特性,模擬了用戶網(wǎng)絡(luò)垂直切換過程,得到了納什均衡點(diǎn),驗(yàn)證了理論分析結(jié)果。
[Abstract]:With the rapid development of communication technology and the continuous improvement of network access technology, a variety of wireless networks exist at the same time. Networks compete with each other and complement each other, forming heterogeneous wireless fusion networks. Among them, the combination of WLAN and 3G network is the most representative. WLAN network has the characteristics of high bandwidth and low coverage. Therefore, the integration of 3G and WLAN can make full use of their advantages. How to make users roam seamlessly between complex heterogeneous access networks is the focus of vertical handoff in heterogeneous fusion networks. Therefore, this paper analyzes and studies the vertical handoff algorithm of heterogeneous converged networks by taking two representative wireless networks of 3G and WLAN as an example. Firstly, this paper briefly introduces the architecture of heterogeneous network convergence, the basic concept of network vertical handoff and the common vertical handoff algorithms, and compares and summarizes the typical vertical handoff algorithms. Secondly, based on 3G and WLAN overlapped network fusion architecture, this paper proposes a joint network handoff decision algorithm based on cost function, and establishes a model to evaluate the performance of network vertical handoff. It is used to evaluate the performance of vertical handoff algorithm. By considering the network bandwidth, the average received signal strength and the application satisfaction factor, the cost function with multiple parameters is designed to quantify the performance of the network. Simulation results show that the cost function based joint network handoff algorithm can reduce the ping-pong effect of network cutting more effectively than the traditional network handoff algorithm based on delay margin and provide higher QoS guarantee for users. Finally, this paper proposes a network vertical handoff algorithm based on group game theory to solve the load balancing problem of fusion network. In this paper, a realization mechanism of network access selection for group users is presented. According to the utility function obtained by users in the network, the non-cooperative game method is used to establish the network utility model. It is proved that the non-cooperative game satisfies the condition of potential game. The simulation results compare the income characteristics of different groups and access networks in the non-cooperative game model, simulate the vertical handover process of user networks, obtain Nash equilibrium points, and verify the theoretical analysis results.
【學(xué)位授予單位】：哈爾濱工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.53;TN925.93

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本文編號(hào)：2024062