Performance Comparison of IEEE 802.11 Back-off Mechanisms in Multi-Hop Wireless Ad-Hoc Network (original) (raw)
2009, Journal of Engineering Science and Technology
Binary Exponential Back-off (BEB) is widely used in many contention-based IEEE 802.11 MAC protocols for its simplicity and good performance, but it has drawbacks especially in multi-hop ad hoc network and some new back-off schemes such as Multiplicative Increase and Linear Decrease(MILD) and Exponential Increase Exponential Decrease (EIED) were proposed. In this paper, performances of three back-off BEB, MILD, and EIED schemes in a multi-hop ad-hoc network are compared. A Markov chain is used to model the channel states and node states of a contention-based IEEE 802.11 DCF protocol in which RTS/CTS/DATA/ACK handshake and three kinds of back-off mechanisms are adopted. These models are used to derive the duration time and steady-state probabilities of the states of node as well as estimated throughput of MANETs. Simulation results revealed that throughput decreases with increase in back-off time, BEB has the longest back-off time and lowest throughput, MILD has the shortest back-off time and highest throughput while EIED has back-off time and throughput between that of BEB and MILD.
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