Paper Details

In this paper we provide a comprehensive delay and queuing analysis for two baselines medium accesscontrol protocols for multi-user cognitive radio networks with homogeneous users and channels and investigate the impactof different network parameters on the system performance. In addition to an accurate Markov chain, which follows thequeue status of all users, several lower complexity queuing theory approximations are provided. Accuracy andperformance of the proposed analytical approximations are verified with extensive simulations. It is observed that using anAloha-type access to the control channel, a buffering MAC protocol, where in case of interruption the CR user waits forthe primary user to vacate the channel before resuming the transmission, outperforms a switching MAC protocol, wherethe CR user vacates the channel in case of appearance of primary users and then compete again to gain access to a newchannel. The reason is that the delay bottleneck for both protocols is the time required to successfully access the controlchannel, which occurs more frequently for the switching MAC protocol. It is thus shown that a clustering approach, whereusers are divided into clusters with a separate control channel per cluster, can significantly improve the performance byreducing the competitions over control channel.

Ms. Trupti A. Jangale, Prof. Rajkumar Paul, “Survey on Delay Analysis of Multichannel Opportunistic Spectrum Access MAC Protocols”, International Journal of Advance Engineering and Research Development (IJAERD), Vol. 3, Issue 7, pp. 37-41, July 2016.