| In Wireless Local Area Networks (WLAN), the medium access control (MAC) protocol is the main element for determining the efficiency and fairness of sharing the limited communication bandwidth of the wireless channel. The fraction of channel bandwidth utilized for successful transmission of messages is an indication of the protocol efficiency. The collision and idle time losses during contention and contention resolution lead to inefficiencies in the operation of the MAC protocol. As the network size increases, the collision time contribution becomes dominant and results in further degradation. In an effort to improve the efficiency performance of IEEE 802.11 MAC, I propose an implicit-reservation protocol, named Distributed Ordering Protocol with Virtual Backoff (DOP-VB), aimed at single-hop ad hoc networks. The protocol proposes to bring in a tighter control among stations through implicit reservations. Each station broadcasts its future backoff interval, which is used by receiving stations for scheduling purposes. (Abstract shortened by UMI.)... |
