A New Hybrid Channel Access Scheme for.pdf

A New Hybrid Channel Access Scheme for Ad Hoc Networks Yu Wang J.J. Garcia-Luna-Aceves Department of Computer Engineering University of California at Santa Cruz Santa Cruz, CA 95064, U.S.A. ywang,jj@cse.ucsc.edu Abstract—Many contention-based channel access schemes have few variants of the basic sender-initiated scheme and they differ been proposed for multi-hop ad hoc networks in the recent past in whether packet sensing or carrier sensing is used, the length and they can be divided into two categories, sender-initiated and requirements of control packets or whether acknowledgement received-initiated, according to the collision avoidance handshake in use. Sender-initiated scheme is adopted in the IEEE 802.11 packet is sent. Among them, the most popular MAC proto- MAC protocol, which is by far the most popular and studied pro- col to date is the IEEE 802.11 distributed foundation wireless tocol. However, the IEEE 802.11 MAC protocol can experience medium access control (DFWMAC) protocol [2] which is part serious fairness problems due to location-dependent contention of the IEEE recommended standard for wireless LANs. The and the binary exponential backoff it uses. On the other hand, IEEE 802.11 protocol has been used extensively as the under- receiver-initiated collision avoidance handshake is more effective at the receiver’s side. Hence, we propose a hybrid channel access lying MAC layer in the investigation of routing protocols for ad scheme that combines both sender-initiated and receiver-initiated