期刊刊名：黎明學報 　 卷期：23卷1期

篇名出版日期：2012年1月31日

作者：Kang-Feng Wu,Cheng-Yu Liu,Yu-Ming Sung,Chung-Hsing Chyuan,Chi-Teh Chen,吳剛鳳,劉正瑜,宋馭民,全中興,陳積德

語言：English

關鍵字：Wireless mesh networks,multi-channel,multi-interface,routing,optimization,無線網狀網路,多通道,多介面,路由,最佳化

被點閱次數：4次

閱讀時間：39sec

摘要：
Wireless mesh networks (WMNs) have emerged as a key technology for next generation wireless broadband networking. A WMN consists of a number of stationary wireless mesh routers forming a wireless backbone. Equipping wireless mesh routers with multiple channels simultaneously can improve the capacity by transmitting over multiple radio simultaneously using orthogonal channels. Efficient channel assignment schemes can relieve the interference effect of close-by transmissions. Effect routing schemes can alleviate potential congestion on any gateways. In this paper, we use the TiMesh multi-channel wireless mesh network (MC-WMN) architecture proposed by A. H. Mohsenian-Rad and V. W. S. Wang [1] and AIMMS-optimization software for operations research applications [2] to integrate design of logical topology, interface assignment, channel allocation and routing for MC-WMN. Ns-2 [3] simulations are conducted to evaluate the design performance. We investigate the network performance by varying the number of network interface cards (NICs), the available orthogonal channels, the nominal link-layer data rate and the user datagram protocol (UDP) traffic flows. The analysis and simulation results show that the TiMesh can provide fairness among the logical links due to its own capability of load balancing and congestion-aware capacity planning. When the number of the UDP traffic flow increases, the packet delivery ratio decreases and the average end-to-end delay increases and therefore degrades the network performance. This phenomenon can be significantly improved by increasing the number of NICs, the number of orthogonal frequency channels and the nominal link-layer data rate.

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