Access control method with variable retransmission probability in ad-hoc networks and its consideration of the changing point

Ad-hoc networks do not need infrastructures such as a base station and it is an interesting technology. One of the important subjects of ad hoc networks is an access control method in radio media. A control channel is usually used with a method of TDMA base. A big influence is given to the performance of ad hoc networks when a frequency channel zone is used as a method of TDMA base. We have already proposed the access control method that is called the Two Division Back off Algorithm (TDBA). This algorithm can solve collisions with few overhead. This method has the problem that the success probability, which, a node acquires, a channel decreases, when the number of the collision-nodes increases. This paper introduces a variable retransmission probability instead of a fixed retransmission probability. The characteristic of performances is compared and evaluated. Then, as for the point as well that value is made to change it is examined.