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Abstract
In this paper, a directional antenna based opportunistic routing (DAOR) scheme is proposed for cognitive radio sensor networks (CRSNs) with QoS assurances and energy efficient design. Specifically, based on the investigation and understanding about how directional antenna operation affects spectrum access and route selection, a joint optimization problem is formulated. After dividing angular domain into multiple antenna sectors with fixed beamwidth and direction, an approximate strategy is presented to determine the antenna sector and transmission channel. With obtained antenna and channel parameters, a heuristic algorithm is further designed to construct prioritized permutation of forwarding candidates, aimed at reducing computational complexity while approaching the optimal solution. Simulation results demonstrate that DAOR outperforms existing QoS routing schemes in terms of QoS provisioning and energy efficiency.
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Details
1 College of Computer Science and Technology, Nanjing Tech University, Nanjing, 211816, China
2 College of Computer Science and Technology, Nanjing Tech University, Nanjing, 211816, China; Department of Electrical and Computer Engineering, University of Waterloo, Waterloo N2L 3G1, Canada