Concurrent Multi-Channel Transmission (CMCT) MAC Protocol in Wireless Mobile Ad Hoc Networks

• Main Authors: Cheng-Shien Lin, 林政憲
• Other Authors: Shyh-In Hwang
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/65766064118301207722

碩士 === 元智大學 === 資訊工程學系 === 94 === The communication protocol 802.11a, b, g that we currently used in wireless mobile ad hoc networks is specified by the IEEE: Institute of Electrical and Electronics Engineers of United State. Both 802.11b and g keeps 83.5MHz bandwidth each. The 802.11a holds even up to 300MHz bandwidth. But as we can see that IEEE 802.11a, b, g this three protocol using only single channel to for transmission. According to the way of modulation from physical layer, we can know that using single channel transmission only used part of or even a small part of the owned bandwidth. In this research paper we propose a multi-channel concurrent transmission mechanism called “Concurrent Multi-Channel Transmission”abbreviation to CMCT that using in wireless mobile ad hoc networks. The data transmission channel is decided according to the finishing time of succeed exchanging RTS, CTS between source and destination node. In the same transmission range we can guarantee that no more than one pairs of source and destination nodes will choose the same data transmission channel. So the data transmission is collision free to fulfill the ways of transmission for both multi-channel and concurrent. We expect to fully using the remaining bandwidth in order to increase the overall network throughput and decreasing the transmission delay of data packets. We focus on improving the poor bandwidth utility of IEEE 802.11a, b, g and lead to the inability to progress the whole network’s throughput. The method CMCT we proposed each node need to equip with only one transceiver. Beside that we assume every node in the network associated with a unique identification. And there is a global time that is agreed by each node in the network.