【摘要】：隨著無線數(shù)據(jù)的迅猛增長和無線終端數(shù)量的快速增加,現(xiàn)有的網(wǎng)絡(luò)架構(gòu)和接入點(diǎn)(AP)選擇機(jī)制已經(jīng)不能滿足用戶日益增長的需求。由于傳統(tǒng)網(wǎng)絡(luò)架構(gòu)的限制,在現(xiàn)有的網(wǎng)絡(luò)架構(gòu)上改進(jìn)也不夠靈活,因此需要突破現(xiàn)有網(wǎng)絡(luò)架構(gòu)的束縛,重新創(chuàng)建一個(gè)新型網(wǎng)絡(luò)架構(gòu),從而滿足網(wǎng)絡(luò)規(guī)模日益增長的需要。 軟件定義網(wǎng)絡(luò)(SDN)由于其控制與轉(zhuǎn)發(fā)分離、可編程性、高創(chuàng)新性的特點(diǎn)成為當(dāng)前網(wǎng)絡(luò)新架構(gòu)的研究熱點(diǎn)。SDN新型網(wǎng)絡(luò)架構(gòu)以其集中控制、可編程性、虛擬化等特性和WLAN技術(shù)的移動(dòng)性和靈活性的特點(diǎn),可以較好的解決當(dāng)前無線網(wǎng)絡(luò)的問題。而基于SDN提出新型AP選擇機(jī)制,不僅是對(duì)SDN新型網(wǎng)絡(luò)架構(gòu)的進(jìn)一步研究,也是對(duì)現(xiàn)有AP選擇機(jī)制的一種改革和創(chuàng)新。 本文通過對(duì)傳統(tǒng)WLAN網(wǎng)絡(luò)架構(gòu)的分析,針對(duì)它們存在的問題,調(diào)研了現(xiàn)有多種基于SDN的無線架構(gòu),提出了新的基于SDN的WLAN組網(wǎng)架構(gòu),重點(diǎn)描述了新型架構(gòu)的業(yè)務(wù)流程、虛擬AP的設(shè)計(jì)和控制器的設(shè)計(jì)。本文結(jié)合多路徑的場景對(duì)該架構(gòu)進(jìn)行仿真,仿真表明,由于虛擬AP設(shè)計(jì)和網(wǎng)絡(luò)資源虛擬化的特性,新型組網(wǎng)架構(gòu)在網(wǎng)絡(luò)吞吐量和平均傳輸時(shí)延方面相比傳統(tǒng)CAPWAP架構(gòu)有一定的改善。 此外,本文還提出了基于SDN的WLAN新型AP選擇機(jī)制-SNBE機(jī)制。該機(jī)制使用多種參數(shù)來表征AP所提供服務(wù)的性能,使用合適的度量函數(shù)來選擇最佳的AP供用戶接入。相比傳統(tǒng)機(jī)制的僅參考單一參數(shù),多參數(shù)能夠更準(zhǔn)確的評(píng)估AP可提供的傳輸性能,所以SNBE機(jī)制可以選擇負(fù)載更小且傳輸性能更優(yōu)的AP,改善了整個(gè)網(wǎng)絡(luò)的吞吐量和平均傳輸時(shí)延。通過仿真,對(duì)比SNBE機(jī)制、傳統(tǒng)AP選擇機(jī)制、基于探測響應(yīng)幀平均延遲的MPD機(jī)制,本文驗(yàn)證了SNBE機(jī)制具有良好的性能。
[Abstract]:With the rapid growth of wireless data and the rapid increase in the number of wireless terminals, the existing network architecture and access point (AP) selection mechanism can no longer meet the growing needs of users. Because of the limitation of the traditional network architecture, the improvement of the existing network architecture is not flexible enough, so it is necessary to break the shackles of the existing network architecture and re-create a new network architecture to meet the increasing needs of the network scale. The software defined network (SDN) has become the research hotspot of the new network architecture because of its separation of control and forwarding, programmability and high innovation. The new network architecture of SDN has its centralized control and programmability. Virtualization and the mobility and flexibility of WLAN technology can solve the current wireless network problems. The proposed new AP selection mechanism based on SDN is not only a further study of the new SDN network architecture, but also a reform and innovation of the existing AP selection mechanism. Based on the analysis of the traditional WLAN network architecture and their existing problems, this paper investigates the existing wireless architecture based on SDN, proposes a new WLAN network architecture based on SDN, and describes the business process of the new architecture. Virtual AP design and controller design. This paper simulates the architecture with multi-path scenarios. The simulation results show that, because of the characteristics of virtual AP design and network resource virtualization, Compared with the traditional CAPWAP architecture, the network throughput and average transmission delay of the new network architecture are improved. In addition, this paper also proposes a new AP selection mechanism of WLAN based on SDN-SNBE mechanism. The mechanism uses a variety of parameters to characterize the performance of the services provided by AP, and uses appropriate metrics to select the best AP for users to access. Compared with the traditional mechanism which only refers to a single parameter, the multi-parameter can more accurately evaluate the transport performance that AP can provide, so the SNBE mechanism can choose the AP, with less load and better transport performance. The throughput and average transmission delay of the whole network are improved. By comparing the SNBE mechanism with the traditional AP selection mechanism, and based on the MPD mechanism which detects the average delay of response frames, this paper verifies the good performance of the SNBE mechanism.
【學(xué)位授予單位】：北京郵電大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN925.93

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