Abstract
Many existing medium access control protocols for cognitive radio wireless sensor networks waste bandwidth and suffer from delay because of the fixed channel negotiation period in the common control channel. In this paper, we propose a medium access control protocol for cognitive radio wireless sensor networks that adjusts the channel negotiation period based on network density. We simulate the proposed approach and compare it to the performance of the fixed channel negotiation period based approaches. The results show that the proposed approach efficiently utilizes white spaces and increases the aggregated goodput.
Highlights
Because the number of wireless sensor networks that basically work in the Industrial, Scientific, and Medical (ISM) radio band is increasing, the spectrum scarcity problem is becoming very challenging for researchers and service providers
ON means the channel is busy; that is, a Primary Users (PU) is active on the channel and it cannot be utilized by the Secondary Users (SU)
Average packet delay (s) performance in the proposed approach. (a) In the proposed protocol, SUs do not have to wait until the expiration of the Channel Negotiation (CN) window; it achieves better goodput and lower delay. (b) The proposed protocol adjusts the CN window and provides opportunities to more nodes to negotiate for channels in the dense topology
Summary
Because the number of wireless sensor networks that basically work in the Industrial, Scientific, and Medical (ISM) radio band is increasing, the spectrum scarcity problem is becoming very challenging for researchers and service providers. The small CN window is a bottleneck in a dense network environment and the large CN window decreases the throughput and increases the delay in a sparse network environment Considering all these shortcomings and the above-mentioned issues, we propose an adaptive CN window-based MAC protocol for fully connected single-hop CRWSNs. The proposed protocol dynamically adjusts the CN period and mitigates the channel utilization limitation, waste of bandwidth in channel negotiation period, and long channel access delay. The proposed protocol is effective in both dense and sparse CRWSNs topologies This protocol adopts a strategy that reduces the number of CN packets mitigating the control channel bottleneck problem. It increases the throughput and decreases the delay. The conclusions of the paper are summarized in the final section
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