University of Oulu

Mahmoodi, H. B., Kaleva, J., & Tolli, A. (2019). Complexity Reduction in Multicast Beamforming for D2D Assisted Coded Caching. 2019 16th International Symposium on Wireless Communication Systems (ISWCS). Presented at the 2019 16th International Symposium on Wireless Communication Systems (ISWCS).

Complexity reduction in multicast beamforming for D2D assisted coded caching

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Author: Mahmoodi, Hamidreza Bakhshzad1; Kaleva, Jarkko1; Tölli, Antti1
Organizations: 1Centre for Wireless Communications, University of Oulu, 90014, Finland
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: 2019-12-18


A novel D2D aided beamforming scheme is proposed, where the local cache content exchange among nearby users is exploited. The transmission phase is split into two sub-phases: local D2D content exchange and downlink transmission. In the D2D sub-phase, users can autonomously share content with the adjacent users. In the downlink sub-phase, the Base station (BS) simultaneously serves some number of users to fulfill their remaining content requests by utilizing multicast beamforming. We first explain the main procedure via two simple examples and show the complexity involved in beamformer design. Then, we present the general formulation and detailed complexity analysis. We show analytically that, by exploiting the D2D exchange, the complexity of downlink multicast beamformer design can be greatly decreased. This provides significantly enhanced overall content delivery performance in terms of computational complexity and total delivery time.

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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
DOI: 10.1109/ISWCS.2019.8877367
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
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