Abstract: In cognitive radio (CR), CR users or also known as secondary users (SUs) are considered as “visitors” to the licensed spectrum. During the case when the primary user claims the band of the spectrum that is occupied by the SU, the SU\'s ongoing call must be transferred to another unused spectrum band. The variation in spectrum band is called spectrum mobility. In this paper, we investigate an analytical model to show the effect of different event on channel availability and spectrum mobility in mobile cognitive radio Ad hoc networks (CR-MANET), along with emphasize on those factors and types of mobility, which necessitate comprehensive mobility and handoff management in CR-MANETs.

• Publication Date: 11-Apr-2012
• DOI: 10.15224/978-981-07-3161-8-184
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Abstract: In this paper, we have proposed modified Enhanced Distributed Coordination Access (EDCA) in order to improve Quality of Service in Wireless LAN. In this approach, we have changed the Contention Window (CW) for back off procedure and method for calculation of Arbitration Inter Frame Spacing (AIFS). The proposed approach is implemented in Quadlet 5.2 Simulator and compared the results with conventional EDCA. The simulation shows that Modified EDCA produces less average jitter, less average end to end delay and improvements in throughput as compared to conventional EDCA mechanism.

• Publication Date: 11-Apr-2012
• DOI: 10.15224/978-981-07-3161-6-101
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