Abstract:

A multichannel adaptive media access control (MAC) protocol based on the conce pts of competing control channel (CCC) and reserving control channel (RCC) is pr esented. In order to access wireless channels, cognitive users reserve the sub frame of RCC through CCC that obligates the access opportunities for different t raffic. The users apply the required bandwidth using RCC based data channel. The channel is distributed and recycled by updating a channel state table. Simulati ons show that the proposed protocol can effectively schedule the accessing of us ers and exhibit good scalability. It significantly reduces the probability of co llision and congestion, thereby improves the endtoend delay and network thro ughput.

Key words: cognitive radio network, channel reserving, media access control protocol