Personalized Federated Learning for Cellular VR: Online Learning and Dynamic Caching

Delivering an immersive experience to virtual reality (VR) users through wireless connectivity offers the freedom to engage from anywhere at any time. Nevertheless, it is challenging to ensure seamless wireless connectivity that delivers real-time and high-quality videos to the VR users. This paper...

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Bibliographic Details
Published in:IEEE transactions on communications Vol. 73; no. 8; pp. 6006 - 6022
Main Authors: Tharakan, Krishnendu S., Dahrouj, Hayssam, Kouzayha, Nour, ElSawy, Hesham, Al-Naffouri, Tareq Y.
Format: Journal Article
Language:English
Published: New York IEEE 01.08.2025
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Algorithms
Approximation algorithms
Caching
Communication
Customization
Delays
Distance learning
distributed online learning
Edge computing
Federated learning
federated learning (FL)
Field of view (FoV)
Mobile computing
Multicast algorithms
Real time
Real-time systems
Resource management
Servers
Stochastic processes
Videos
Virtual reality
virtual reality (VR)
Wireless communication
ISSN:0090-6778, 1558-0857
Online Access:Get full text
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Summary:Delivering an immersive experience to virtual reality (VR) users through wireless connectivity offers the freedom to engage from anywhere at any time. Nevertheless, it is challenging to ensure seamless wireless connectivity that delivers real-time and high-quality videos to the VR users. This paper proposes a field of view (FoV) aware caching for mobile edge computing (MEC)-enabled wireless VR network. In particular, the FoV of each VR user is cached/prefetched at the base stations (BSs) based on the caching strategies tailored to each BS. Specifically, decentralized and personalized federated learning (DP-FL) based caching strategies with guarantees are presented. Considering VR systems composed of multiple VR devices and BSs, a DP-FL caching algorithm is implemented at each BS to personalize content delivery for VR users. The utilized DP-FL algorithm guarantees a probably approximately correct (PAC) bound on the conditional average cache hit. Further, to reduce the cost of communicating gradients, one-bit quantization of the stochastic gradient descent (OBSGD) is proposed, and a convergence guarantee of <inline-formula> <tex-math notation="LaTeX">\mathcal {O}(1/\sqrt {T}) </tex-math></inline-formula> is obtained for the proposed algorithm, where T is the number of iterations. Additionally, to better account for the wireless channel dynamics, the FoVs are grouped into multicast or unicast groups based on the number of requesting VR users. The performance of the proposed DP-FL algorithm is validated through realistic VR head-tracking dataset, and the proposed algorithm is shown to have better performance in terms of average delay and cache hit as compared to baseline algorithms.
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ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2025.3535878