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Cognitive Access Control Strategies with Periodic Channel Sensing for Continuous-Time Markovian Channels

Qianchuan Zhao, Tsinghua University

Abstract:

The problem of cognitive access of channels of primary users by a secondary user is considered. The transmissions of primary users are modeled as independent continuous-time Markovian on-off processes. A secondary cognitive user employs a slotted transmission format, and it senses one of the possible channels before transmission. The objective of the cognitive user is to maximize its throughput subject to collision constraints imposed by the primary users. We are interested in the class of stationary access control strategies with periodic channel sensing since practically they have small storage requirement and theoretically they can be solved by linear programming. In addition, we will show when the collision constraints are tight, the optimal access strategy can be implemented by a simple memoryless access policy with periodic channel sensing which can be extended to multiple secondary users.

Presentation Slides