Selection of optimal transmission time in Cognitive Radio Network for efficient VoIP performance

Abstract

Real-time VoIP communication demands strong QoS assurance for its efficient performance. Ensuring high quality of VoIP transmission in spectrally congested scenarios requires deployment of VoIP applications in intelligent Cognitive Radio Networks (CRN) that aim to increase spectrum utilization through its opportunistic mode of communication. However, complexities inherent in unmodified CRN make it unworthy of hosting VoIP applications. The objective of this work is to successfully implement VoIP service in CRN by optimal selection of transmission time so that adequate QoS is ensured for VoIP users. Considering imperfect spectrum sensing, an algorithm is proposed to select the most efficient transmission duration for VoIP communication by taking into account relevant parameters in CRN. Mathematical analysis followed by simulation results provides clear testimony to the fact that VoIP call quality is enhanced after implementing the proposed algorithm.

An analytical framework for channel reservation scheme in Cognitive Radio Network

“…Thus, PU arrival triggers disruptions in SU transmissions, which may severely degrade the QoS of the underlying applications for SUs. In this regard, several solutions have been proposed with respect to Medium Access Control (MAC) protocols [5][6], spectrum sharing [7] and handoff schemes [8][9], optimal selection of sensing and transmission time intervals [10][11], physical layer aspects [12][13][14] etc.…”

Designing a Markov Model for the Analysis of 2-tier Cognitive Radio Network

“…Extensive research work is being carried out to achieve higher spectrum utilization in CRN through formulation of appropriate Medium Access Control (MAC) protocols [7,8], handoff schemes [9], timing parameters [10,11], etc. However, the system capacity in all these works has a maximum upper bound as derived in [12].…”