Performance investigation of SR-HARQ transmission scheme in realistic cognitive radio system

Madeeha Ishtiaq, Ateeq Ur Rehman, Fazlullah Khan, Abdus Salam, Shahzad

Research output: Chapter in Book/Conference proceedingConference contributionpeer-review

4 Citations (Scopus)

Abstract

The cognitive radio (CR) paradigm has been accepted as an optimal solution for overcoming the spectrum shortage as well as maximizing the utilisation of the earmarked available spectrum. The CR systems have been widely explored in terms of its principles, dynamic architecture, operating principles etc, however, very little research is so far dedicated to reliable data transmission. Therefore, in this paper, the classic Selective-Repeat Hybrid Automatic-Repeat-Request (SR-HARQ) has been invoked for error-free communication in a realistic imperfect sensing environment of CR system. Specifically, the cognitive-aided SR-HARQ first senses the licensed primary user (PU) channel and transmits its data packets only when the channel is deemed to be idle from the PU. Otherwise, it will wait until the detection of the idle channel. To model the idle and busy activities of PU over the channel a two-state Markov chain (MC), while the cases of wrong sensing results have been modelled using four-state MC. Using this modelling, the performance in terms of throughput and average delay have been studied. The performance results show that the sensing results have significant effects on the throughput, average delay and end-to-end delay of system. Because, due to false-alarm, CU has to wait longer while the mis-detection case increases the collision and hence causing more retransmissions of packets.

Original languageEnglish
Title of host publication2019 IEEE 9th Annual Computing and Communication Workshop and Conference, CCWC 2019
EditorsSatyajit Chakrabarti, Himadri Nath Saha
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages258-263
Number of pages6
ISBN (Electronic)9781728105543
DOIs
Publication statusPublished - 12 Mar 2019
Externally publishedYes
Event9th IEEE Annual Computing and Communication Workshop and Conference, CCWC 2019 - Las Vegas, United States
Duration: 7 Jan 20199 Jan 2019

Publication series

Name2019 IEEE 9th Annual Computing and Communication Workshop and Conference, CCWC 2019

Conference

Conference9th IEEE Annual Computing and Communication Workshop and Conference, CCWC 2019
Country/TerritoryUnited States
CityLas Vegas
Period7/01/199/01/19

Keywords

  • CR
  • Delay.
  • HARQ
  • Markov Chain
  • Reliable data transmission
  • Selective-Repeat
  • Spectrum
  • Throughput
  • imperfect sensing

ASJC Scopus subject areas

  • Computer Networks and Communications

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