本文選題：異構(gòu)網(wǎng)絡(luò) + 垂直切換��； 參考：《國(guó)防科學(xué)技術(shù)大學(xué)》2014年碩士論文

【摘要】：隨著無(wú)線網(wǎng)絡(luò)通信技術(shù)的發(fā)展,為了滿(mǎn)足用戶(hù)的個(gè)性化、多業(yè)務(wù)需求,未來(lái)網(wǎng)絡(luò)環(huán)境將是各種異構(gòu)無(wú)線網(wǎng)絡(luò)共存的局面。當(dāng)前網(wǎng)絡(luò)通信的發(fā)展趨勢(shì)和要求,是在保證服務(wù)質(zhì)量(Quality of Service,Qo S)的基礎(chǔ)下為用戶(hù)提供跨異構(gòu)接入網(wǎng)絡(luò)的無(wú)縫多業(yè)務(wù)需求。垂直切換技術(shù)是泛在網(wǎng)絡(luò)環(huán)境下多種異構(gòu)網(wǎng)絡(luò)共存的基礎(chǔ),是實(shí)現(xiàn)移動(dòng)用戶(hù)無(wú)縫漫游的關(guān)鍵和核心技術(shù)。本文主要面向多業(yè)務(wù)泛在網(wǎng)絡(luò)的垂直切換技術(shù)展開(kāi)研究,主要工作包括:1.結(jié)合當(dāng)前異構(gòu)無(wú)線網(wǎng)絡(luò)的發(fā)展?fàn)顩r,分析了各類(lèi)切換種類(lèi)和切換控制方式,重點(diǎn)了解了垂直切換過(guò)程和性能指標(biāo),深入研究了泛在異構(gòu)網(wǎng)絡(luò)環(huán)境下一些典型的垂直切換算法。針對(duì)當(dāng)前算法存在的一些缺陷,探討性的提出了一種面向多業(yè)務(wù)泛在網(wǎng)絡(luò)環(huán)境的多屬性判決垂直切換策略。該策略采用SINR差值門(mén)限作為切換觸發(fā)條件,在保證反映網(wǎng)絡(luò)信道質(zhì)量的基礎(chǔ)上避免了“乒乓效應(yīng)”。同時(shí)利用終端移動(dòng)速度對(duì)候選網(wǎng)絡(luò)進(jìn)行篩選和評(píng)分,一方面考慮了移動(dòng)性對(duì)網(wǎng)絡(luò)服務(wù)質(zhì)量的影響,另一方面減少了判決算法不必要的計(jì)算。在判決算法的設(shè)計(jì)中綜合考慮多屬性決策因素,權(quán)重設(shè)計(jì)綜合考慮了網(wǎng)絡(luò)環(huán)境和Qo S需求。另外在多業(yè)務(wù)場(chǎng)景應(yīng)用中通過(guò)分配相應(yīng)業(yè)務(wù)權(quán)重值,利用兩重代價(jià)函數(shù)充分考慮了業(yè)務(wù)優(yōu)先級(jí)要求并且降低了實(shí)現(xiàn)復(fù)雜度。2.利用3G-WLAN松耦合互聯(lián)融合模型,設(shè)計(jì)實(shí)現(xiàn)了3G-WLAN互聯(lián)網(wǎng)絡(luò)平臺(tái)系統(tǒng),對(duì)論文中提出的切換策略進(jìn)行了實(shí)現(xiàn)驗(yàn)證。闡述了系統(tǒng)的總體架構(gòu)和功能模塊,詳述了切換模塊的設(shè)計(jì)與實(shí)現(xiàn),并通過(guò)搭建環(huán)境對(duì)系統(tǒng)進(jìn)行了相關(guān)測(cè)試。測(cè)試結(jié)果表明,所設(shè)計(jì)系統(tǒng)能夠?qū)崿F(xiàn)用戶(hù)自適應(yīng)切換接入到相應(yīng)網(wǎng)絡(luò)。3.對(duì)論文提出的垂直切換策略進(jìn)行仿真驗(yàn)證。通過(guò)設(shè)置仿真場(chǎng)景和網(wǎng)絡(luò)參數(shù),利用與典型的基于RSS判決算法做對(duì)比分析,對(duì)提出的垂直切換策略進(jìn)行性能評(píng)估。仿真結(jié)果表明,本文提出的切換策略能夠有效地減少切換次數(shù),同時(shí)判決結(jié)果更好的反映Qo S需求和網(wǎng)絡(luò)環(huán)境,提高了切換判決的科學(xué)性和合理性。本文主要面向同一時(shí)刻存在多項(xiàng)活躍業(yè)務(wù)的垂直切換場(chǎng)景,研究工作對(duì)于實(shí)現(xiàn)用戶(hù)在未來(lái)泛在異構(gòu)網(wǎng)絡(luò)下多業(yè)務(wù)需求、無(wú)縫切換漫游具有重要的意義。
[Abstract]:With the development of wireless network communication technology, in order to meet the needs of users' individuation and multi-service, the future network environment will be the coexistence of various heterogeneous wireless networks. At present, the development trend and requirement of network communication is to provide users with seamless multi-service requirements across heterogeneous access networks on the basis of guaranteeing quality of Service quality (QoS). Vertical handoff is the basis of coexistence of heterogeneous networks in a ubiquitous network environment. It is the key and core technology to realize seamless roaming of mobile users. This paper mainly focuses on the vertical handoff technology for multi-service ubiquitous networks, the main work of which includes: 1. Combined with the development of heterogeneous wireless networks, this paper analyzes various types of handoff and handover control methods, emphasizes on the vertical handoff process and performance index, and deeply studies some typical vertical handoff algorithms in heterogeneous networks. Aiming at some shortcomings of the current algorithm, a multi-attribute decision vertical handoff strategy for multi-service ubiquitous network environment is proposed. The SINR difference threshold is used as the switching trigger condition, and the "ping-pong effect" is avoided on the basis of ensuring the quality of the network channel. At the same time, the terminal mobility speed is used to screen and score the candidate networks. On the one hand, the influence of mobility on the quality of service is considered, and the unnecessary computation of the decision algorithm is reduced on the other hand. In the design of the decision algorithm, the multi-attribute decision factors are considered comprehensively, and the network environment and QoS requirements are considered in the weight design. In addition, in the multi-service scenario application, by assigning the corresponding service weight value, the dual cost function is used to fully consider the service priority requirements and reduce the complexity of the implementation. Using the 3G-WLAN loosely coupled interconnection fusion model, the 3G-WLAN Internet platform system is designed and implemented, and the handover strategy proposed in this paper is verified. The overall architecture and function module of the system are expounded, the design and implementation of the switch module are described in detail, and the system is tested by setting up the environment. The test results show that the designed system can adaptively switch users to the corresponding network. 3. The vertical handoff strategy proposed in this paper is verified by simulation. The performance of the proposed vertical handoff strategy is evaluated by setting the simulation scene and network parameters and comparing with the typical decision algorithm based on RSS. Simulation results show that the proposed handoff strategy can effectively reduce the number of handoff, and the decision results better reflect QoS requirements and network environment, and improve the scientific and reasonable of handoff decision. This paper focuses on the vertical handoff scenarios where there are many active services at the same time. The research work is of great significance to the realization of users' multi-service requirements and seamless handoff roaming in heterogeneous networks in the future.
【學(xué)位授予單位】：國(guó)防科學(xué)技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TN929.5

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本文編號(hào)：1891931