Performance Evaluation of Efficient MAC in Mobile Ad Hoc Wireless Networks
Wireless media is in very much demand because of high mobility
of the users and establishing ad hoc network in emergency
situations, which requires the designing of an efficient and
priority based MAC (Medium Access Protocol) as a resource to
support MANET (Mobile Ad hoc Networks) adequately. There
are various MAC standards used in MANET. The IEEE 802.11
is one of them MAC layer standard and most frequently applied
to such networks presently. We found that the IEEE 802.11
MAC standard is not very much suitable into wireless network
scenario because its poor performance results in lower
throughput, higher delay ,large number of collisions and poor fair
access of cannels. In this paper, we propose a dynamic PBCMAC
protocol for wireless ad hoc networks - named as Priority
Based Contention-MAC protocol- in which contention window
size increases or decreases dynamically and non-uniformly after
the collision depending upon the priority levels of nodes in the
network. It decides its lower Backoff time as per higher priority
level of the nodes to access channel adequately. The simulation
result show that PBC-MAC scheme is outperform than the
Binary Exponential Backoff (BEB) scheme in the IEEE 802.11
MAC in respect of delay.
Keywords: Ad hoc Networks, Contention Window, Delay, MAC, PBC-MAC
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