Abstract
In high diversity node situation, multichannel MAC protocol can improve the frequency efficiency, owing to fewer collisions compared with single-channel MAC protocol. And the performance of cyclic quorum-based multichannel (CQM) MAC protocol is outstanding. Based on cyclic quorum system and channel slot allocation, it can avoid the bottleneck that others suffered from and can be easily realized with only one transceiver. To obtain the accurate performance of CQM MAC protocol, a Markov chain model, which combines the channel-hopping strategy of CQM protocol and IEEE 802.11 distributed coordination function (DCF), is proposed. The results of numerical analysis show that the optimal performance of CQM protocol can be obtained in saturation bound situation. And then we obtain the saturation bound of CQM system by bird swarm algorithm. In addition, to improve the performance of CQM protocol in unsaturation situation, a dynamic channel slot allocation of CQM (DCQM) protocol is proposed, based on wavelet neural network. Finally, the performance of CQM protocol and DCQM protocol is simulated by Qualnet platform. And the simulation results show that the analytic and simulation results match very well; the DCQM performs better in unsaturation situation.
Highlights
IEEE 802.11 Distributed Coordination Function (DCF) [1] has been widely used in mobile ad hoc networks
IEEE 802.11 DCF suffers from many collisions in high diversity node situation
A Markov chain model is proposed to analyze the performance of cyclic quorum-based multichannel (CQM) protocol theoretically
Summary
IEEE 802.11 Distributed Coordination Function (DCF) [1] has been widely used in mobile ad hoc networks. Different from the channel negotiating pattern, some other solutions utilize the channel-hopping concept to switch among data channels to achieve concurrent handshaking. The protocols [19,20,21] are equipped with only one transceiver In these protocols, different nodes have different channel-hopping sequences, and each pair of nodes is able to communicate with each other when they switch to the same channel at the same time slot. According to channel-hopping strategy of CQM protocol, based on cyclic quorum system, every channel has the same chance to be accessed It can overcome the bottleneck of channel negotiating pattern and the missing receiver problem of channel-hopping pattern.
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