University of Oulu

H. B. Mahmoodi, J. Kaleva, S. P. Shariatpanahi and A. Tölli, "D2D Assisted Beamforming for Coded Caching," 2020 IEEE Wireless Communications and Networking Conference (WCNC), Seoul, Korea (South), 2020, pp. 1-6, doi: 10.1109/WCNC45663.2020.9120557

D2D assisted beamforming for coded caching

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Author: Mahmoodi, Hamidreza Bakhshzad1; Kaleva, Jarkko1; Shariatpanahi, Seyed Pooya2;
Organizations: 1Centre for Wireless Communications, University of Oulu, P.O. Box 4500, 90014, Finland
2School of Electrical and Computer Engineering, College of Engineering, University of Tehran, I
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.4 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2020
Publish Date: 2020-08-06


Device-to-device (D2D) aided beamforming for coded caching is considered in a finite signal-to-noise ratio regime. A novel beamforming and resource allocation scheme is proposed where the local cache content exchange among nearby users is exploited. The transmission is split into two phases: local D2D content exchange and downlink transmission. In the D2D phase, users can autonomously share content with the adjacent users. The downlink phase utilizes multicast beamforming to simultaneously serve all users to fulfill the remaining content requests. A low complexity D2D-multicast mode selection algorithm is proposed with comparable performance to the optimal exhaustive search. We first explain the main procedure via one simple example and then present the general formulation. Furthermore, D2D transmission scenarios and conditions useful for minimizing the overall delivery time are identified. By exploiting the direct D2D exchange of file fragments, the common multicasting rate for delivering the remaining file fragments in the downlink phase is increased, providing greatly enhanced overall content delivery performance.

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Series: IEEE Wireless Communications and Networking Conference
ISSN: 1525-3511
ISSN-E: 1558-2612
ISSN-L: 1525-3511
ISBN: 978-1-7281-3106-1
ISBN Print: 978-1-7281-3107-8
Pages: 1 - 6
DOI: 10.1109/WCNC45663.2020.9120557
Host publication: 2020 IEEE Wireless Communications and Networking Conference (WCNC), 25-28 May 2020, Seoul, Korea (South)
Conference: IEEE Wireless Communications and Networking Conference
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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