Performance analysis of centralized dynamic spectrum access via channel reservation mechanism in cognitive radio networks
Autor: | Hania H. Farag, Hassan Nadir Kheirallah, Ehab F. Badran, Nehal M. El Azaly |
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Rok vydání: | 2021 |
Předmět: |
Computer science
020209 energy Cognitive radio networks 02 engineering and technology 01 natural sciences 010305 fluids & plasmas Reduction (complexity) 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Overall system cost Dynamic spectrum access CTMC Channel allocation schemes Blocking (radio) business.industry Wireless network Quality of service General Engineering Engineering (General). Civil engineering (General) Cognitive radio Handover Channel reservation TA1-2040 business Computer network Communication channel |
Zdroj: | Alexandria Engineering Journal, Vol 60, Iss 1, Pp 1677-1688 (2021) |
ISSN: | 1110-0168 |
Popis: | The two main goals in wireless networks are to provide channel allocation opportunities for incoming services and to assure the accomplishment of ongoing services. In this paper, a channel reservation scheme in cooperative cognitive radio networks (CRNs) based on dynamic spectrum access (DSA) is proposed. In this scheme, a centralized cognitive manager (CCM) provides the dynamic coordination access for primary users (PUs) and secondary users (SUs) through partitioning the spectrum into non-reserved channels (N-CRN) and reserved channels (R-CRN). N-CRN can be exploited by licensed PUs and unlicensed SUs, while R-CRN is dedicated for active SUs until the successful completion of their service. If a SU session in N-CRN is interrupted by the sudden arrival of PU, then a spectrum handover occurs to R-CRN to resume its session. The reserved channel number R is deduced upon the reduction of both forced termination and blocking probabilities for SUs while satisfying PUs’ traffic demands. Also, overall system cost and SU cost functions are investigated. Simulation results show significant reduction in blocking and forced termination probabilities and improvement in utility function and service completion rate of SUs while meeting PU’s quality of service (QoS) aims. For example, when the arrival traffic rates per channel λ p = 0.5 , and for R = 1 , R = 2 and R = 3 , the values of specific SU forced termination probabilities P ft are 0.1597, 0.116, 0.0799 respectively compared to 0.2106 for the case of no channel reservation. Furthermore, blocking probability and service completion rate of PU are evaluated to demonstrate the effect of channel reservation variation on the system performance. |
Databáze: | OpenAIRE |
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