Supporting Real-Time Data Transmissions in Cognitive Radio Networks Using Queue Shifting Mechanism

B Seetha Ramanjaneyulu,K Annapurna

doi:10.4018/ijertcs.20210101.oa1

Abstract

As cognitive radio networks are conceptualized to make use of the opportunistic spectrum access, the users of these networks may face problems in satisfying their quality of service (QoS) requirements. Some services of users like real-time audio and video which cannot tolerate inter-packet delays will be affected more due to this. The problem occurs due to the non-availability of channels to these applications at some instants. This problem can be addressed if the available channels are judiciously distributed among the competing users. One such mechanism that dynamically allocates the competing users to multiple queues, and shifting the users to higher-level queues as the time elapses is introduced in this work. This is found to help the users of cognitive radio networks to communicate reasonably well even when fewer channels are available for opportunistic use. Results are indicated in terms of blocking probabilities of real-time data. Markov chain-based analysis and discrete event simulation studies are carried out.

Highlights

Under-utilization of spectrum bandwidths allocated to various licensed services, has given rise to the concept of Cognitive Radio Networks (CRN)
The problem occurs due to the non-availability of channels to these applications at some instants. This problem can be addressed if the available channels are judiciously distributed among the competing users. One such mechanism that dynamically allocates the competing users to multiple queues, and shifting the users to higher-level queues as the time elapses is introduced in this work
This is found to help the users of cognitive radio networks to communicate reasonably well even when fewer channels are available for opportunistic use

Summary

Introduction

Under-utilization of spectrum bandwidths allocated to various licensed services, has given rise to the concept of Cognitive Radio Networks (CRN). It is based on the proposal of using those underunutilized bandwidths by non-licensed users, through opportunistic spectrum access (Mitola J., 2009). The main advantage of the cognitive radio networks is that they make better use of those bandwidths If this mechanism is adopted in those frequency ranges in which many of the mobile and cellular communication systems are operating, it will be extremely helpful, because those bands are crowded heavily and hardly any bandwidth is available at government agencies to allot it to new services. Cognitive radio networks are vying for better use of these

Methods

Results

Conclusion