![]() ![]() ![]() ![]() Cognitive radio sensor networks Introduction 9,10 (CRSNs) emerge as the times require. Keywords Cognitive radio sensor networks, variable duty cycle, opportunistic pipeline routing, data transmission delay, energy efficiency Date received: 19 September 2017 accepted: 16 March 2018 Handling Editor: Tao Han vacant bands. The theoretical analysis and experimental results show that, compared with previous opportunistic pipeline routing, energy consumption of network is relatively balanced and the data transmission delay can be reduced by 36.6% in the Variable Duty Cycle for Opportunistic Pipeline Routing scheme. In the Variable Duty Cycle for Opportunistic Pipeline Routing scheme, the nodes employ high duty cycle in the area far from the sink, and low duty cycle in the area near to the sink, which can achieve the balance of energy con- sumption and reduce the data transmission delay while not affecting network lifetime. In view of this situation, we propose the delay optimal opportunistic pipeline routing scheme named Variable Duty Cycle for Opportunistic Pipeline Routing (VDCOPR). However, the energy efficiency of cognitive radio sensor networks with opportunistic pipeline routing is low, and the data transmission delay can be further optimized. Opportunistic pipeline routing is a poten- tial technology to reduce the delay, which can use nodes outside the main forwarding path forward data opportunisti- cally when the transmission fails. Delay-sensitive data applications in cognitive radio sensor networks require efficient real-time communication. In order to solve the problem of spectrum scarcity in wireless sensor networks, cognitive radio technology can be intro- duced into wireless sensor networks, giving rising to cognitive radio sensor networks. Delay optimal opportunistic pipeline routing scheme for cognitive radio sensor networks: Delay optimal opportunistic pipeline routing scheme for cognitive radio sensor networks: ![]()
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