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Enhancing Performance in Multi Channel Wireless Networks Using Channel Selection Strategies

Devkota Yuba Raj  
【摘要】: Multi-channel Medium Access Control (MAC) protocols have been used to improve the performance in IEEE 802.11 wireless standard. In‘n’channel environment, practically it is impossible to increase the performance by‘n’times however improvements can be made as near as possible. This paper uses ns-2 simulations to show the improvement of performance in multi channel environment than IEEE 802.11 DCF environment. Ns-2.29 is extended with Hyacinth framework to work in multi-channel environment. IEEE 802.11 DCF is modified to work in multi-channel environment. The MAC protocol used is Dedicated Control Channel MAC Protocol and Receiver Based Channel Selection Strategy is studied. The common multi channel hidden terminal problem has been an issue in multi-channel environment and it is shown that Multi channel MAC has better approach to solve that problem. The channel selection scheme reduces the frame losses and improves performance. The performance metrics studied to compare two protocols are throughput, delay and throughput with increased packet size. The IEEE 802.11 DCF protocol is modified so that it can work in the multi-interface framework. Multi-channel environment increases the performance of a wireless system but it also complicates the process. There are various issues [28] [42] [45] in multi-channel framework and each of them have to be deal with ease. Although improving the throughput in‘n’channel environment by‘n’times is limited only in ideal case, however, throughput can go as much as possible. The simulation performed later in chapter, increases throughput by about 40% and explained that increasing the packet size can increase the throughput but within certain criteria. The performance also depends on how well the channel selection is done. In IEEE 802.11 DCF, there is no need to choose the channel being it a single channel but in multi-channel interface, it is necessary to choose a suitable channel. My work includes Receiver Based Channel Selection Approach to select the suitable channel, which means receiver will choose one of the free channels from its power strength and sends it on RTS signal to sender. The data exchange takes place on that reserved channel. This thesis tries to deal with multi-channel hidden terminal issue discussed in chapter II.


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