Energy-Efficient Communication Protocol for Wireless Microsensor Networks
HICSS '00 Proceedings of the 33rd Hawaii International Conference on System Sciences-Volume 8 - Volume 8
DCR-MAC: distributed cognitive radio MAC protocol for wireless ad hoc networks
Wireless Communications & Mobile Computing
An efficient quiet period management scheme for cognitive radio systems
IEEE Transactions on Wireless Communications
HC-MAC: A Hardware-Constrained Cognitive MAC for Efficient Spectrum Management
IEEE Journal on Selected Areas in Communications
IEEE Journal on Selected Areas in Communications
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In cognitive radio networks, secondary users conduct local sensing to use underutilized spectrum bands. However, every secondary user's local sensing usually gives rise to much sensing overhead, and it requires the proper quiet period. Moreover, a secondary user should keep the quiet periods when the secondary users within its interference range perform spectrum sensing. As a result, both the local sensing overhead and quiet periods may reduce the channel utilization of a secondary user. To cope with these problems, in this paper, we propose a zone-based sharable sensing scheme, in which multiple secondary users alternate in local sensing and share the sensing results with others. We defined a certain area, so-called sensing zone, in which the sensing result by one secondary user is valid for others within the given area. The secondary user in charge of sensing in a sensing zone is elected in a distributed way. Each of the other secondary users can determine its quiet period schedules in accordance with the distance between itself and the elected sensing node. Numerical analyses and computer simulations show that our proposed sensing achieves a significantly reduced sensing overhead as well as an improved channel access opportunity.