肖偉 王麗文
摘要:無(wú)線Mesh網(wǎng)絡(luò)是具有多跳、自組織、自愈合和高健壯性等特點(diǎn)的寬帶網(wǎng)絡(luò)。因?yàn)榻Y(jié)點(diǎn)信號(hào)之間存在干擾及頻譜資源的有限性,如何通過(guò)頻譜分配來(lái)提升網(wǎng)絡(luò)效率成為Mesh網(wǎng)絡(luò)研究的重要方向。該文給出一種多信道分配算法,目的在于改善無(wú)線mesh網(wǎng)絡(luò)可用信道頻率的綜合效率,基礎(chǔ)在于網(wǎng)絡(luò)結(jié)構(gòu)按拓?fù)溥M(jìn)行結(jié)構(gòu)分層。該算法首先進(jìn)行分層設(shè)計(jì),然后在拓?fù)浞謱拥幕A(chǔ)上根據(jù)信道的優(yōu)先級(jí)分配信道,達(dá)到頻率資源的有效分配的目標(biāo)。仿真實(shí)驗(yàn)說(shuō)明該算法能有效地提高無(wú)線網(wǎng)絡(luò)整體性能。
關(guān)鍵詞:無(wú)線mesh網(wǎng)絡(luò);信道分配;拓?fù)浞謱?/p>
中圖分類(lèi)號(hào):TP393 文獻(xiàn)標(biāo)識(shí)碼:A 文章編號(hào):1009-3044(2014)29-6839-03
Abstract: Wireless Mesh Network is the broadband wireless Networks with multi-hop, self-organization, self-healing, high robustness and other characteristics. Due to the limited spectrum resources and the signal transmission between nodes interfere with each other, how to distibute spectrum scope and increase the transmission performance becomes an important orientation in the Mesh network. for increasing the combined efficiency in wireless mesh network based on the available channels frequency utilization, this paper presents a novel algorithm based on topology hierarchy. Firstly, this algorithm realize the hierarchical topology, and then layered on the basis of the topology depend on the priority of the channels to assign channels. Simulation consequence indicates that the whole performance in Mesh networks would be improved using the algorithm.
Key words: wireless mesh networks; channel assignment; topology hierarchical
無(wú)線Mesh網(wǎng)絡(luò)[1,2]是一種在無(wú)線局域網(wǎng)的基礎(chǔ)上發(fā)展起來(lái)的,具有自組織、自愈合和高健壯性等優(yōu)點(diǎn)的新型寬帶無(wú)線網(wǎng)絡(luò)結(jié)構(gòu)。無(wú)線 Mesh 網(wǎng)絡(luò)技術(shù)采用多點(diǎn)到多點(diǎn)通信的網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu),支持多種類(lèi)型的網(wǎng)絡(luò)接入,被認(rèn)為是未來(lái)無(wú)線通信發(fā)展的關(guān)鍵技術(shù)。
在無(wú)線Mesh網(wǎng)絡(luò)中,頻率通道選擇、功率控制和無(wú)線路由等將直接影響系統(tǒng)設(shè)備的傳輸能力和無(wú)線鏈路質(zhì)量等Qos性能。為了適應(yīng)無(wú)線Mesh網(wǎng)絡(luò)對(duì)傳輸性能的要求,近年來(lái)提出多射頻多信道(Multi-Radio Multi-Channel,MRMC)[3,4]技術(shù)應(yīng)用到無(wú)線 Mesh 網(wǎng)絡(luò)中,形成了多射頻多信道 Mesh 網(wǎng)絡(luò)((Multi-Radio Multi-Channel WMN,MRMC-WMN)[5]。
MRMC-WMN 網(wǎng)絡(luò)具有提升網(wǎng)絡(luò)容量,增強(qiáng)數(shù)據(jù)傳輸可靠性,減輕網(wǎng)絡(luò)的信道干擾等諸多優(yōu)點(diǎn)。在此基礎(chǔ)上,高效的信道分配算法能有效地提高網(wǎng)絡(luò)的吞吐率,增加信道的重用性,優(yōu)化網(wǎng)絡(luò)的通信性能?!?br>