【摘要】：隨著無(wú)線通信技術(shù)的不斷發(fā)展,移動(dòng)數(shù)據(jù)流量快速增長(zhǎng),同時(shí)也為移動(dòng)蜂窩網(wǎng)帶來(lái)了流量過(guò)載的挑戰(zhàn)。為了減輕流量壓力,異構(gòu)網(wǎng)絡(luò)協(xié)作分流的方法備受重視。然而考慮到不同接入網(wǎng)絡(luò)的差異性和外部環(huán)境的波動(dòng)性,如果不能對(duì)異構(gòu)網(wǎng)絡(luò)進(jìn)行統(tǒng)一有效的管理控制,將必然導(dǎo)致網(wǎng)絡(luò)資源不能按需分配和帶寬資源利用率較低等嚴(yán)重的問(wèn)題。因此,為了實(shí)現(xiàn)異構(gòu)網(wǎng)絡(luò)在流量分配領(lǐng)域的協(xié)同合作,需要進(jìn)一步研究有效的分流方法。本文圍繞異構(gòu)網(wǎng)絡(luò)分流問(wèn)題,從基于SDN的分流架構(gòu)及自適應(yīng)流量分載算法兩個(gè)方面進(jìn)行了深入研究。具體創(chuàng)新成果如下： 第一,以軟件定義網(wǎng)絡(luò)(SDN)為研究基礎(chǔ),基于無(wú)線接入網(wǎng)絡(luò)協(xié)作分流的場(chǎng)景,提出了一種新型的開(kāi)放式分流架構(gòu),深入研究了網(wǎng)絡(luò)控制器的實(shí)現(xiàn)方法和層間通信協(xié)議的制定,采用無(wú)線網(wǎng)絡(luò)資源抽象和無(wú)縫移動(dòng)管理兩項(xiàng)基本功能實(shí)現(xiàn)底層異構(gòu)接入網(wǎng)的統(tǒng)一管理。 第二,提出了一種基于吸引粒子選擇算法(Attractor Selection)的自適應(yīng)流量分載算法,選取LTE與WLAN重覆蓋網(wǎng)絡(luò)的場(chǎng)景,采用離散馬爾可夫-泊松過(guò)程的排隊(duì)模型(dMMPP)計(jì)算業(yè)務(wù)接入時(shí)延,自適應(yīng)地根據(jù)不斷波動(dòng)的網(wǎng)絡(luò)狀態(tài)選擇合適的接入網(wǎng)絡(luò)進(jìn)行分流。通過(guò)仿真表明,該方法不但有效地實(shí)現(xiàn)了LTE網(wǎng)絡(luò)與WLAN網(wǎng)絡(luò)之間的分流,而且使系統(tǒng)性能在時(shí)延和網(wǎng)絡(luò)切換次數(shù)上達(dá)到了均衡,在滿足用戶業(yè)務(wù)需求的同時(shí)提高了網(wǎng)絡(luò)的穩(wěn)定性。
[Abstract]:With the continuous development of wireless communication technology, mobile data traffic is growing rapidly, but also brings the challenge of traffic overload for mobile cellular networks. In order to reduce traffic pressure, the method of collaborative streaming in heterogeneous networks has been paid more attention. However, considering the diversity of different access networks and the volatility of the external environment, if the heterogeneous network can not be unified and effective management control, It will inevitably lead to some serious problems, such as network resources cannot be allocated according to their needs and the utilization of bandwidth resources is low. Therefore, in order to achieve collaborative cooperation in the field of traffic allocation in heterogeneous networks, it is necessary to further study effective shunt methods. In this paper, the shunt architecture based on SDN and the adaptive traffic load splitting algorithm are studied in detail around the shunt problem of heterogeneous networks. The concrete innovation achievements are as follows: first, based on the research of software defined network (SDN), a new open shunt architecture is proposed based on the scenario of wireless access network collaboration and shunt. The realization method of network controller and the formulation of communication protocol between layers are deeply studied. Two basic functions of wireless network resource abstraction and seamless mobile management are adopted to realize the unified management of the underlying heterogeneous access network. Secondly, an adaptive traffic load sharing algorithm based on the particle selection algorithm (Attractor Selection) is proposed. The scenario of LTE and WLAN recoverage network is selected, and the queue model (dMMPP) of discrete Markov Poisson process is used to calculate the service access delay. Adaptively select the appropriate access network according to the fluctuating state of the network. The simulation results show that the proposed method not only realizes the shunt between LTE network and WLAN network effectively, but also equalizes the system performance in terms of delay and network handover times, and improves the stability of the network while satisfying the needs of user services.
【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】：2015
【分類(lèi)號(hào)】：TN92

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