University of Oulu

M. Salehi, A. Tölli and S. P. Shariatpanahi, "Coded Caching with Uneven Channels: A Quality of Experience Approach," 2020 IEEE 21st International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Atlanta, GA, USA, 2020, pp. 1-5, doi: 10.1109/SPAWC48557.2020.9154234

Coded caching with uneven channels : a quality of experience approach

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Author: Salehi, Mohammad Javad1; Tölli, Antti1; Shariatpanahi, Seyed Pooya2
Organizations: 1Center for Wireless Communications (CWC), University of Oulu, 90570, Oulu, Finland
2School of Electrical and Computer Engineering College of Engineering, University of Tehran Tehran, Iran
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.1 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2020
Publish Date: 2021-02-18


The rate performance of wireless coded caching schemes is typically limited by the lowest achievable per-user rate in the given multicast group, during each transmission time slot. In this paper, we provide a new coded caching scheme, alleviating this worst-user effect for the prominent case of multimedia applications. In our scheme, instead of maximizing the symmetric rate among all served users, we maximize the total quality of experience (QoE); where QoE at each user is defined as the video quality perceived by that user. We show the new scheme requires solving an NP-hard optimization problem. Thus, we provide two heuristic algorithms to solve it in an approximate manner; and numerically demonstrate the near-optimality of the proposed approximations. Our approach allows flexible allocation of distinct video quality for each user, making wireless coded caching schemes more suitable for real-world implementations.

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Series: IEEE International Workshop on Signal Processing Advances in Wireless Communications
ISSN: 2325-3789
ISSN-L: 2325-3789
ISBN: 978-1-7281-5478-7
ISBN Print: 978-1-7281-5479-4
Article number: 9154234
DOI: 10.1109/SPAWC48557.2020.9154234
Host publication: 21st IEEE International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2020
Conference: IEEE International Workshop on Signal Processing Advances in Wireless Communications
Type of Publication: A4 Article in conference proceedings
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This work was supported by the Academy of Finland under grants no. 319059 (Coded Collaborative Caching for Wireless Energy Efficiency) and 318927 (6Genesis Flagship).
Academy of Finland Grant Number: 319059
Detailed Information: 319059 (Academy of Finland Funding decision)
318927 (Academy of Finland Funding decision)
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