Analysis of handoff delay for proactive spectrum handoff scheme with PRP M/G/1/K queuing system in cognitive radio networks

Abstract

Spectrum handoff has a negative impact on the performance of cognitive users (CUs) in terms ofhandoff delay in cognitive radio (CR) networks. In this study, a pre‐emptiveresume priority (PRP) M/G/1/K queuing network model is proposed with a finitenumber of allowable interruptions for proactive decision spectrum handoff schemein order to minimise the cumulative handoff delay (CHD) and total service time(TST) for CUs. The CHD and TST for different proactive decision handoff schemes:non‐switching spectrum handoff, switching spectrum handoff, and random spectrumhandoff are modeled under the proposed PRP M/G/1/K queuing network model. Comprehensive results of CHD and TST are obtained to compare the performances ofthe proactive decision handoff schemes under the proposed PRP M/G/1/K queuingnetwork model. This study also presents an analytical framework to examine theeffect of primary users activity and buffer size on spectrum handoff delayperformance with a finite number of allowable interruptions in a CR network. Thereafter, the optimal buffer size ( K ) is estimated for theproposed PRP M/G/1/K queuing network model, which gives performance similar tothe infinite buffer size PRP M/G/1 queuing model with negligible (<1%)error.