Paper Info
Title
Design And Implementation Of A Novel Two-Phase Spectrum Handoff Scheme For Qos Aware Mobile Users In Cognitive Radio Networks
Abstract
Quality of Service (QoS) aware spectrum handoff operation is critical for Secondary Users (SUs) executing realtime applications like Voice over IP (VoIP) in Cognitive Radio Networks (CRNs). The problem is aggravated by the inclusion of occasionally mobile SUs where pre-selected target channels are often rendered insignificant during handoff under dynamic conditions. Conventional proactive and reactive schemes may underperform due to channel obsolescence issues and unacceptable handoff latency respectively while a combined approach is not yet explored under the constraints of practical applicability. In view of these challenges and enormous significance of VoIP based CRN in 5G networks, this paper proposes a practically feasible two-phase spectrum handoff methodology with I_Phase and S_Phase operating under alternate conditions. I_Phase deploys a three level dropping decision scheme followed by a two-tier spectrum handoff policy and is motivated by an integrated approach spanning every CR operation. S_Phase incorporates user mobility and application-oriented aspects where channel drop is governed by a joint two-order Hidden Markov Model - custom Damerau- Levenshtein distance metric based policy and spectrum handoff is monitored by a novel non-cooperative TOPSIS method. These phases are assisted by two proposed prerequisite techniques namely ACT (Adaptive Call Transmission) involving CR timing parameters and VER (VoIP Early Resumption) dealing with early call resumption. Comparative analysis of QoS metrics including per-instance handoff latency, transmission duration per target channel, channel drop and call drop probabilities, etc. in analytical and simulation platforms record significant performance improvement. Novelty of this work further relies on design and execution of SU prototype with the proposed scheme in test-bed that successfully provides QoS guarantees during spectrum handoff.
Year
DOI
Venue
2021
10.1016/j.comnet.2021.108194
COMPUTER NETWORKS
Keywords
DocType
Volume
Cognitive radio networks, Quality of service, Spectrum handoff, Test-bed execution, Voice over IP
Journal
195
ISSN
Citations 
PageRank 
1389-1286
0
0.34
References 
Authors
0
2
Name
Order
Citations
PageRank
Tamal Chakraborty1102.98
Iti Saha Misra27519.05