A survey of overlay and underlay paradigms in cognitive radio networks. (18th October 2017)

• Record Type: Journal Article
• Authors: Kumar, Bhoopendra; Kumar Dhurandher, Sanjay; Woungang, Isaac
• Is Part Of: International journal of communication systems. Volume 31:Number 2(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-10-18
• Subjects: cognitive radio -- hybrid access -- network parameters -- overlay -- radio spectrum resources utilization -- qualitative comparison -- underlay; Telecommunication systems -- Periodicals; 621.382
• DOI: 10.1002/dac.3443
• Languages: English
• ISSNs: 1074-5351

Abstract

Summary: In the recent years, wireless applications and services have grown tremendously, resulting to a shortage of radio spectrum. On one hand, most of the available radio spectrum has already been allocated to different users and service providers. On another hand, research and statistics have revealed that the spectrum utilization usability is very limited. To address this dilemma, the concept of cognitive radio has emerged, which promotes the use of overlay and underlay transmission techniques to boost the utilization of radio spectrum resources. This paper provides a comprehensive survey of these 2 techniques and compares them qualitatively based on several network parameters. Next, this paper simulates overlay and underlay transmission techniques in OMNeT++ simulator on different network parameters, namely, Primary user arrival rate, throughput, sensing duration, and energy consumption. Our findings reveal that neither the overlay nor the underlay technique is sufficient itself to fulfill the demands for future wireless systems, and adopting a hybrid access technique consisting of a joint utilization of overlay and underlay approaches is desirable. Furthermore, the key challenges and open research issues in radio spectrum resources utilization are discussed. Abstract : This paper provides a comprehensive survey of these 2 techniques and compares them qualitatively based on several network parameters. Our findings reveal that neither the overlay nor the underlay technique is sufficient itself to fulfill the demands for future wireless systems, and adopting a hybrid access technique consisting of a joint utilization of overlay and underlay approaches is desirable. In addition, key challenges and open research issues in radio spectrum resources utilization are discussed.