Advances in Computer Science : an International Journal (ACSIJ)
Presently, IEEE 802.11 DCF is MAC protocol applied in wireless local networks. DCF would be inefficient, since there are two types of overload: collision time and channel's idle time. Present paper, evaluated the performance and proposed an efficient MAC protocol for these networks called D-CW. D-CW will decrease both the channel's idle time and the collision time. D-CW, by dividing the value of Contention Window (CW) by two, reduces the time required for successful node forwarding and by selecting variable contention window for packet forwarding from each node with a random uniform function, what if a successful forwarding or an unsuccessful one, decreases the collision time.