【摘要】：無線Mesh網(wǎng)絡(luò)(WMNs,Wireless Mesh Networks,又稱無線網(wǎng)狀網(wǎng)、無線網(wǎng)格網(wǎng)等)具有更低的部署成本,較大的網(wǎng)絡(luò)覆蓋范圍,較高的網(wǎng)絡(luò)容錯能力,以及動態(tài)的自組網(wǎng)和自配置功能。因此,無線Mesh網(wǎng)絡(luò)接入技術(shù)已經(jīng)逐漸成為一個可以提供低成本互聯(lián)網(wǎng)接入的靈活、高效、可靠的無線廣域覆蓋多跳通信解決方案,是一種新型的有廣闊應(yīng)用前景的無線組網(wǎng)技術(shù)。 隨著互聯(lián)網(wǎng)和無線多媒體技術(shù)的飛速發(fā)展,人們對于無線網(wǎng)絡(luò)提供的服務(wù)質(zhì)量(QoS)要求也越來越高,特別是作為無線數(shù)據(jù)業(yè)務(wù)入口的無線Mesh網(wǎng)絡(luò)。無線網(wǎng)絡(luò)服務(wù)質(zhì)量無法保證的一個主要原因是當前網(wǎng)絡(luò)資源不足,導致網(wǎng)絡(luò)業(yè)務(wù)流時常發(fā)生擁塞,而傳統(tǒng)的增大信號強度、冗余編碼和變換路由等方式在提高信道容量的同時,反而會減少網(wǎng)絡(luò)可用資源,加重網(wǎng)絡(luò)擁塞甚至造成整個網(wǎng)絡(luò)癱瘓,無法從根本上解決網(wǎng)絡(luò)擁塞問題。因此,無線Mesl節(jié)點之間如何合理地管理和分配網(wǎng)絡(luò)資源以提高網(wǎng)絡(luò)吞吐量成為亟待解決的問題,本文的主要貢獻有： 1.為了提高無線Mesh網(wǎng)絡(luò)信道容量,對現(xiàn)有的無線Mesh路由器配置多個射頻收發(fā)器和多條信道,相鄰的無線Mesh節(jié)點通過工作在不同信道上,使用多個射頻收發(fā)器同時通信。在此網(wǎng)絡(luò)模型的基礎(chǔ)上,我們提出了一種基于非合作博弈理論的多射頻多信道聯(lián)合分配策略,無線Mesh節(jié)點根據(jù)自身流量負載,動態(tài)地調(diào)整射頻接口與信道分配,從而實現(xiàn)數(shù)據(jù)流之間的無干擾傳輸。 2.進一步采用跨層協(xié)作技術(shù)優(yōu)化管理和分配多射頻多信道無線Mesh網(wǎng)絡(luò)資源,以提高網(wǎng)絡(luò)傳輸速率。通過跨層協(xié)作設(shè)計,對無線Mesh節(jié)點的物理層、數(shù)據(jù)鏈路層和傳輸控制層上的發(fā)射功率、信道分配和傳輸速率進行聯(lián)合優(yōu)化,從而提高無線Mesh網(wǎng)絡(luò)吞吐量。 3.最后,考慮無線Mesh網(wǎng)絡(luò)的多徑路由特性,提出一種基于博弈理論的跨層擁塞控制方案。該方案通過協(xié)議棧中網(wǎng)絡(luò)層和傳輸控制層的信息交互,使得節(jié)點在網(wǎng)絡(luò)層進行路由選擇的同時,傳輸層能夠根據(jù)網(wǎng)絡(luò)層鏈路擁塞狀態(tài)調(diào)整擁塞窗口大小,從而有效減少傳輸時延,改善無線Mesh網(wǎng)絡(luò)吞吐量。
[Abstract]:Wireless Mesh networks (WMNs,Wireless Mesh Networks, wireless grid networks, etc.) have lower deployment costs, larger network coverage, higher network fault tolerance, and dynamic ad hoc network and self-configuration functions. Therefore, wireless Mesh network access technology has gradually become a flexible, efficient and reliable wireless wide-area coverage multi-hop communication solution that can provide low-cost Internet access. Is a new type of wireless networking technology with broad application prospects. With the rapid development of Internet and wireless multimedia technology, the quality of service (QoS) requirements of wireless network are becoming more and more high, especially the wireless Mesh network, which is the entry of wireless data services. One of the main reasons why the quality of service in wireless networks cannot be guaranteed is that the current network resources are insufficient, which leads to the congestion of network traffic. However, the traditional methods such as increasing signal strength, redundant coding and changing routing can improve the channel capacity at the same time. On the contrary, it will reduce the available resources of the network, aggravate the network congestion and even cause the whole network paralysis, which can not fundamentally solve the network congestion problem. Therefore, how to reasonably manage and allocate network resources between wireless Mesl nodes to improve network throughput becomes an urgent problem. The main contributions of this paper are as follows: 1. In order to improve the channel capacity of wireless Mesh networks, multiple radio frequency transceivers and multiple channels are configured for existing wireless Mesh routers. Adjacent wireless Mesh nodes work on different channels and use multiple radio frequency transceivers to communicate simultaneously. On the basis of this network model, we propose a multi-radio frequency and multi-channel joint allocation strategy based on non-cooperative game theory. Wireless Mesh nodes dynamically adjust RF interface and channel allocation according to their traffic load. In order to achieve non-interference transmission between data streams. 2. Furthermore, cross-layer collaboration technology is used to optimize the management and allocation of multi-radio frequency and multi-channel wireless Mesh network resources to improve the network transmission rate. Through cross-layer collaborative design, the transmission power, channel allocation and transmission rate on the physical layer, data link layer and transmission control layer of wireless Mesh nodes are jointly optimized to improve the throughput of wireless Mesh networks. 3. Finally, considering the multipath routing characteristics of wireless Mesh networks, a cross-layer congestion control scheme based on game theory is proposed. Through the information interaction between the network layer and the transmission control layer in the protocol stack, the network layer can adjust the congestion window size according to the congestion state of the network layer while the nodes are routing in the network layer. In order to reduce the transmission delay effectively, improve the throughput of wireless Mesh network.
【學位授予單位】：福建師范大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.5

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