University of Oulu

M. Moltafet, M. Leinonen and M. Codreanu, "Worst Case Analysis of Age of Information in a Shared-Access Channel," 2019 16th International Symposium on Wireless Communication Systems (ISWCS), Oulu, Finland, 2019, pp. 613-617. doi: 10.1109/ISWCS.2019.8877239

Worst case analysis of age of information in a shared-access channel

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Author: Moltafet, Mohammad1; Leinonen, Markus1; Codreanu, Marian2
Organizations: 1Centre for Wireless Communications – Radio Technologies, University of Oulu, Finland
2Department of Science and Technology, Linköping University, Sweden
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.3 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2019
Publish Date: 2019-11-18


Freshness of status update packets is essential for enabling a wide range of Internet of Things (IoT) applications. In this paper, we consider a status update system in which various sensors are assigned to transmit status update packets of a physical process to a desired destination. We consider that the sensors share a wireless channel and contend for the channel access based on a carrier sense multiple access (CSMA) method. We study freshness of the status update system at the destination using the age of information (AoI) metric. To this end, we analyze the worst case average AoI for each sensor in the CSMA-based system. Numerical results show that the AoI in the CSMA-based system may dramatically increase when the number of sensors increases. Moreover, we observe that the contention window size and the packet arrival rate must be optimized since they have a critical role in the performance of the system.

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Series: International Symposium on Wireless Communication Systems
ISSN: 2154-0217
ISSN-E: 2154-0225
ISSN-L: 2154-0217
ISBN: 978-1-7281-2527-5
ISBN Print: 978-1-7281-2528-2
Pages: 613 - 617
DOI: 10.1109/ISWCS.2019.8877239
Host publication: 2019 16th International Symposium on Wireless Communication Systems (ISWCS) 27-30 August 2019 Oulu, Finland
Conference: International Symposium on Wireless Communication Systems
Type of Publication: A4 Article in conference proceedings
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This research has been financially supported by Infotech Oulu. M. Codreanu would like to acknowledge the support of the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie Grant Agreement No. 793402 (COMPRESS NETS). This research has also been financially supported by Academy of Finland 6Genesis Flagship (grant 318927) and Finnish Foundation for Technology Promotion.
Academy of Finland Grant Number: 318927
Detailed Information: 318927 (Academy of Finland Funding decision)
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