| Summary: | 碩士 === 國立高雄應用科技大學 === 電機工程系 === 97 === The IEEE 802.11 standard for wireless LAN provides multi-channels available for use. The use of multi-channels in wireless networks could provide performance advantages in reducing collisions and enabling more concurrent transmissions. The multi-channel mac protocols can be categorized into two types : dedicated control channel and common control period.
The major advantage of dedicated control channel is that it does not require time
synchronization, so the channel negotiations can be done anytime. However, the control channel will be congested because mobile nodes are more then needed in the available negotiation channels of the control channel. In this paper, we proposed a new protocol called Enhanced Multi-Channel MAC (EMMAC) Protocol. EMMAC include“Sender Based Negotiation”and“Uninterrupted Transmission”mechanism.“Sender Based Negotiation”mechanism improves control channel congestion.“Uninterrupted Transmission”mechanism effectively uses idle data channel to transmit data. Through the use of the ns-2 simulator, the results show that the protocol achieves higher network throughput.
The main contribution of this paper is that we propose EMMAC protocol on multi-channel environment.The protocol can not only enhance channel utilization, but also reduce the packet delay and packet loss rate. In the future, the mobility nodes issues into consideration will be added, and applied in the wireless mesh networks.
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