在隨意網路中使用頻道分配之多頻道的媒體存取控制協定

A Multi-Channel MAC Protocol with Channel Distribution for Mobile Ad Hoc Networks

鐘文卿(Wen-Ching Chung)

指導教授 ： 廖華文

大同大學/經營設計學院/資訊經營學系所/碩士(2007年)

摘要

在IEEE 802.11無線網路的環境中可利用多頻道增加網路的產出量明顯的比利用單一頻道來的多。在這篇論文中，我們提出一個於一根天線與無法獲得整個網路集中資訊的限制下的多頻道多媒體存取協定(CD-MAC protocol)，用來改善MMAC協定浪費頻寬的問題，另外，降低在協調頻道時控制封包的碰撞，以增進網路的產出量。在我們所提出的CD-MAC協定中，固定的ATIM window被分成兩個階段。第一個階段稱為Decide Channel Window (DCW)，它是用來協調分配第二階段中來源節點(source)與目的地節點(destination)將位在哪個頻道上。第二個階段稱為 Exchange Packet Window (EPW)，它是來源節點與目的地節點利用控制封包來競爭資料傳輸的使用權。我們所提出的CD-MAC協定有效的分散來源節點與目的地節點去競爭資料傳輸的使用權，使得封包的碰撞可以被降低，並且提高網路的產出量。實驗的部份顯示出我們所提出的CD-MAC協定能夠有效的善用多頻道並且分散競爭的來源節點與目的地節點以達到較高的網路產出量。

關鍵字

隨意網路

並列摘要

Multiple channels are available for use in IEEE 802.11 and throughput of network can increase by using multiple channels than a single channel obviously. In this paper, we proposed a novel multi-channel MAC protocol that enables nodes under the constraint of one half duplex radio and without centralized knowledge of network by switching channels dynamically. In our CD-MAC protocol, it divides the fixed ATIM window into two phases. The first divided small window of the fixed-time interval is called Decide Channel Window (DCW) that is used for source and destination to decide which the second divided small window of the fixed-time interval in. The second divided small window of the fixed-time interval is called Exchange Packet Window (EPW) that is pair source and destination nodes compete to use the channel to transfer packets. By using this technique well, we can distribute pair source and destination nodes to compete data channel, thus collisions can be decreased hugely, and throughput can be increased. The simulation results show that our protocol successfully exploits that use bandwidth of multiple channels well and distribute pair nodes to achieve higher throughput.

並列關鍵字

channel

參考文獻

[2] Jon T. Adams, “An Introduction to IEEE STD 802.15.4,” IEEE Aerospace Conference, 2006.

[3] Th. Arampatzis, J. Lygeros and S. Manesis, “A Survey of Applications of Wireless Sensors and Wireless Sensor Networks,” The 13th Mediterranean Conference on Control and Automation Limassol, Cyprus, June 27-29, 2005.

[5] Zi-Tsan Chou, “A Randomized Power Management Protocol with Dynamic Listen Interval for Wireless Ad Hoc Networks,” IEEE Vehicular Technology Conference, 2006.

[6] Hongning Dai, Kam-Wing Ng and Min-You Wu, ”An Overview of MAC Protocols with Directional Antennas in Wireless Ad Hoc Networks,” IEEE Wireless and Mobile Communications, 2006.

[7] Matthew S. Gast, “802.11 Wireless Networks: The Definitive Guide”, O'Reilly, April 2002.