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Cognitive radio technology provides opportunistic wireless spectrums access for the secondary users (SUs) while primary users (PUs) are dormant. By emergence of a PU in the cognitive radio networks, SUs are required to vacant the channel by using spectrum handoff approaches to avoid any collision. Providing an efficient and flexible coordination protocol for spectrum handoff is a challenging step. In this paper, we propose a novel proactive spectrum handoff protocol called multiple-single rendezvous (MSRV) protocol which uses multiple rendezvous (MRV) and single rendezvous (SRV) coordination policy to provide a higher throughput and context adaptability. MRV coordination policy has the advantage of negotiating in different channels simultaneously and avoid single control channel congestion. On the other hand, in order to share the PUs’ channel usage history information between the SUs for predicting channels’ availability, it is necessary to utilize a SRV coordination scheme. The proposed MSRV protocol improves the average throughput of the SUs and decreases the average service time comparing to the other existing proactive spectrum handoff protocols. Moreover, MSRV protocol gives priority to the handoff SUs which decreases service times. It is an crucial property for the delay sensitive applications. Our proposed protocol achieves 20% throughput and 13.7% average service time improvement in 1.25 and 10 (pkts/s) PUs’ traffic load compared to the SRV proactive spectrum handoff protocol proposed by Mehrnoush et al., respectively.
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- A distributed spectrum handoff MSRV protocol for the cognitive radio ad hoc networks
Vahid T. Vakili
- Springer US