虛擬化無線接入網的優(yōu)化控制研究
發(fā)布時間：2018-11-20 06:57
【摘要】：無線局域網(WLAN)以自身成本低廉、安裝簡單等特性在日常生活中得到了廣泛普及,近年來無線數據業(yè)務量更是呈現出迅猛增長的趨勢,毫無疑問WLAN存在著巨大的發(fā)展?jié)摿?但與此同時WLAN也暴露出一些問題。一是傳統(tǒng)網絡中分布式架構不能完成大型環(huán)境組網,而集中式架構組建大型網絡時設備受制約嚴重;二是現有WLAN網絡對用戶QoE考慮不夠,也不能進行細化到特定用戶的管控;三是用戶接入AP的默認算法很容易造成網絡的不平衡。對于上述出現在當前WLAN的問題,本文認真分析研究后,在同一個邏輯集中管控架構下,設計并實現了一些優(yōu)化控制策略。首先,本文在該架構下研究了虛擬化無線接入網的問題。設計并實現了一個針對虛擬接入點(VAP)的用戶接入管理子系統(tǒng),包括portal前端頁面、后臺驗證邏輯及流程控制、數據庫存儲、后臺與控制器的交互,它能完成的功能主要包括如下幾個部分:一是用戶入網的portal認證,區(qū)分用戶身份進行不同認證流程,驗證其合法性后存儲相關信息,并與控制器交互以協同完成專屬虛擬接入點(PVAP)的操作;二是系統(tǒng)用戶的信息維護,允許對個人賬戶及設備信息進行查看或修改;三是WLAN網絡狀態(tài)的可視化,結合STA和AP的位置信息,在百度地圖上向網絡管理員提供全網的AP和STA連接狀態(tài)等信息。然后,本文在該架構下,研究了STA關聯的優(yōu)化控制算法。本文以平衡各STA獲得的網絡吞吐量,并盡力提高整個網絡的吞吐量為目標,先設計了一個全局接入控制算法(GACA),該算法以最大化網絡總吞吐量為目標函數建立起一個混合整數非線性規(guī)劃問題,然后用混合自適應遺傳算法來完成求解,得到STA關聯AP的優(yōu)化方案,該算法適合周期性運行來對網絡進行調整;接著設計了一個增量式接入控制算法(IACA),此算法綜合考慮STA接入不同AP對整體網絡的影響,為STA挑選最合適的AP讓其關聯,該算法適合當有新STA想要連接到網絡時運行。通過在NS-3上進行大量仿真實驗,證明了本文設計的算法是有效的。
[Abstract]:WLAN (WLAN) has been widely used in daily life because of its low cost and simple installation. In recent years, wireless data traffic has been increasing rapidly. There is no doubt that WLAN has great development potential. But at the same time WLAN also exposed some problems. One is that the distributed architecture in the traditional network can not complete the large-scale environment networking, but the equipment is severely restricted when the centralized architecture builds the large-scale network, the other is that the existing WLAN network does not consider the QoE of the user enough, nor can it be refined to the control of the specific user. Third, the default algorithm of user access to AP is very easy to cause network imbalance. For the above problems which appear in the current WLAN, after careful analysis and research, this paper designs and implements some optimal control strategies under the same logical centralized control framework. Firstly, this paper studies the problem of virtualized wireless access network under this architecture. A user access management subsystem for virtual access point (VAP) is designed and implemented, including portal front-end page, background verification logic and flow control, database storage, background interaction with controller. The functions it can accomplish mainly include the following parts: first, the portal authentication of users entering the network, distinguishing the identity of users to carry out different authentication processes, verifying its legitimacy and storing relevant information. And interacts with the controller to cooperate to complete the operation of the exclusive virtual access point (PVAP); The second is the information maintenance of the system users, allowing the individual account and equipment information to be viewed or modified; The third is the visualization of WLAN network state, combined with the location information of STA and AP, to provide the network administrator with the information of AP and STA connection status of the whole network on the map of Baidu. Then, the optimal control algorithm of STA association is studied in this paper. In order to balance the throughput of each STA and improve the throughput of the whole network, a global access control algorithm, (GACA), is designed in this paper. In this algorithm, a hybrid integer nonlinear programming problem is established with the objective function of maximizing the total throughput of the network. Then the hybrid adaptive genetic algorithm is used to solve the problem, and the optimization scheme of STA associated AP is obtained. The algorithm is suitable for periodic operation to adjust the network. Then an incremental access control algorithm (IACA),) is designed which considers the influence of STA access to different AP on the overall network and selects the most appropriate AP for STA to associate. The algorithm is suitable for running when a new STA wants to connect to the network. Through a lot of simulation experiments on NS-3, it is proved that the algorithm designed in this paper is effective.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN92
本文編號：2344150
[Abstract]:WLAN (WLAN) has been widely used in daily life because of its low cost and simple installation. In recent years, wireless data traffic has been increasing rapidly. There is no doubt that WLAN has great development potential. But at the same time WLAN also exposed some problems. One is that the distributed architecture in the traditional network can not complete the large-scale environment networking, but the equipment is severely restricted when the centralized architecture builds the large-scale network, the other is that the existing WLAN network does not consider the QoE of the user enough, nor can it be refined to the control of the specific user. Third, the default algorithm of user access to AP is very easy to cause network imbalance. For the above problems which appear in the current WLAN, after careful analysis and research, this paper designs and implements some optimal control strategies under the same logical centralized control framework. Firstly, this paper studies the problem of virtualized wireless access network under this architecture. A user access management subsystem for virtual access point (VAP) is designed and implemented, including portal front-end page, background verification logic and flow control, database storage, background interaction with controller. The functions it can accomplish mainly include the following parts: first, the portal authentication of users entering the network, distinguishing the identity of users to carry out different authentication processes, verifying its legitimacy and storing relevant information. And interacts with the controller to cooperate to complete the operation of the exclusive virtual access point (PVAP); The second is the information maintenance of the system users, allowing the individual account and equipment information to be viewed or modified; The third is the visualization of WLAN network state, combined with the location information of STA and AP, to provide the network administrator with the information of AP and STA connection status of the whole network on the map of Baidu. Then, the optimal control algorithm of STA association is studied in this paper. In order to balance the throughput of each STA and improve the throughput of the whole network, a global access control algorithm, (GACA), is designed in this paper. In this algorithm, a hybrid integer nonlinear programming problem is established with the objective function of maximizing the total throughput of the network. Then the hybrid adaptive genetic algorithm is used to solve the problem, and the optimization scheme of STA associated AP is obtained. The algorithm is suitable for periodic operation to adjust the network. Then an incremental access control algorithm (IACA),) is designed which considers the influence of STA access to different AP on the overall network and selects the most appropriate AP for STA to associate. The algorithm is suitable for running when a new STA wants to connect to the network. Through a lot of simulation experiments on NS-3, it is proved that the algorithm designed in this paper is effective.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN92
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