A new approach to channel access scheduling for Ad Hoc networks
Proceedings of the 7th annual international conference on Mobile computing and networking
Proceedings of the 5th ACM international symposium on Mobile ad hoc networking and computing
MSWiM '04 Proceedings of the 7th ACM international symposium on Modeling, analysis and simulation of wireless and mobile systems
Proceedings of the 10th annual international conference on Mobile computing and networking
Opportunistic spectrum access: challenges, architecture, protocols
WICON '06 Proceedings of the 2nd annual international workshop on Wireless internet
On Channel Selection Strategies for Multi-Channel MAC Protocols in Wireless Ad Hoc Networks
WIMOB '06 Proceedings of the 2006 IEEE International Conference on Wireless and Mobile Computing, Networking and Communications
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In this paper we propose a novel Medium Access Control (MAC) protocol that provides spectrum agile bandwidth allocation for cognitive radios. Our MAC protocol, called Spectrum Agile Multiple Access or simply SAMA, harnesses the frequency agility of cognitive radios in allocating fair and contention free bandwidth under a heterogeneous spectrum environment. SAMA accomplishes its bandwidth allocation by allowing each radio to synchronize its channel access schedule with its neighbors through the use of TDMA based dynamic control slot scheduling to exchange schedule information. Combining the schedule information with the cross layer information, SAMA establishes a unique communication group called "Context Group (CG)" which consists of radios which belong to a common information flow (i.e. intermediate nodes in a route) for optimizing bandwidth allocation and improving end-to-end latency. The establishment of CG leads to a dramatic throughput improvement over a naive approach as shown by our simulation results.