University of Oulu

M. Abolpour, M. Salehi and A. Tölli, "Cache-Aided Communications in MISO Networks with Dynamic User Behavior: A Universal Solution," 2023 IEEE International Symposium on Information Theory (ISIT), Taipei, Taiwan, 2023, pp. 132-137, doi: 10.1109/ISIT54713.2023.10206827

Cache-aided communications in MISO networks with dynamic user behavior : a universal solution

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Author: Abolpour, Milad1; Salehi, MohammadJavad1; Tölli, Antti1
Organizations: 1Centre for Wireless Communications, University of Oulu, Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.5 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2023
Publish Date: 2023-09-29


A practical barrier to the implementation of cache-aided networks is dynamic and unpredictable user behavior. In dynamic setups, users can freely depart and enter the network at any moment. The shared caching concept has the potential to handle this issue by assigning K users to P caching profiles, where all η p users assigned to profile p store the same cache content defined by that profile. The existing schemes, however, cannot be applied in general and are not dynamic in the true sense as they put constraints on the transmitter-side spatial multiplexing gain α. Specifically, they work only if α ≤ min p η p or α≥η^, where in the latter case, γ is the normalized cache size of each user, η^is an arbitrary parameter satisfying 1≤η^≤maxpηp, and the extra condition of α ≥ Kγ should also be met. In this work, we propose a universal caching scheme based on the same shared-cache model that can be applied to any dynamic setup, extending the working region of existing schemes to networks with minpηp≤α≤η^ and removing any other constraints of existing schemes. We also derive the closed-form expressions for the achievable degrees-of-freedom (DoF) of the proposed scheme and show that it achieves the optimal DoF for uniform user distributions. Notably, it is the first scheme to achieve the optimal DoF of Kγ + α for networks with uniform user distribution, α>η^, and non-integer αη^, without imposing any other constraints. Finally, we use numerical simulations to assess how non-uniform user distribution impacts the DoF performance and illustrate that the proposed scheme provides a noticeable improvement over unicasting for uneven distributions.

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Series: IEEE International Symposium on Information Theory proceedings
ISSN: 2157-8095
ISSN-E: 2157-8117
ISSN-L: 2157-8095
ISBN: 978-1-6654-7554-9
ISBN Print: 978-1-6654-7555-6
Pages: 132 - 137
DOI: 10.1109/ISIT54713.2023.10206827
Host publication: 2023 IEEE International Symposium on Information Theory (ISIT)
Conference: IEEE International Symposium on Information Theory
Type of Publication: A4 Article in conference proceedings
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This research has been supported by the Academy of Finland, 6G Flagship program under Grant 346208, 343586 (CAMAIDE), and by the Finnish-American Research and Innovation Accelerator (FARIA) program.
Academy of Finland Grant Number: 346208
Detailed Information: 346208 (Academy of Finland Funding decision)
343586 (Academy of Finland Funding decision)
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