D2D assisted multi-antenna coded caching
|Author:||Bakhshzad Mahmoodi, Hamidreza1; Kaleva, Jarkko2; Shariatpanahi, Seyed Pooya3;|
1Centre for Wireless Communications, University of Oulu, Oulu, Finland
2Solmu Technologies, Oulu, Finland
3School of Electrical and Computer Engineering, College of Engineering, University of Tehran, Tehran, Iran
|Online Access:||PDF Full Text (PDF, 1.2 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe2023081194914
Institute of Electrical and Electronics Engineers,
|Publish Date:|| 2023-08-11
A device-to-device (D2D) aided multi-antenna coded caching scheme is proposed to improve the average delivery rate and reduce the downlink (DL) beamforming complexity. Novel beamforming and resource allocation schemes are proposed where local data exchange among nearby users is exploited. The transmission is split into two phases: local D2D content exchange and DL transmission. In the D2D phase, subsets of users are selected to share content with the adjacent users directly. In this regard, a low complexity D2D mode selection algorithm is proposed to find the appropriate set of users for the D2D phase with comparable performance to the optimal exhaustive search. During the DL phase, the base station multicasts the remaining data requested by all the users. We identify scenarios and conditions where D2D transmission can reduce the delivery time. Furthermore, we demonstrate how adding the new D2D phase to the DL-only scenario can significantly reduce the beamformer design complexity in the DL phase. The results further highlight that by partly delivering requested data in the D2D phase, the transmission rate can be boosted due to more efficient use of resources during the subsequent DL phase. As a result, the overall content delivery performance is greatly enhanced, especially in the finite signal-to-noise (SNR) regime.
|Pages:||16271 - 16287|
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
213 Electronic, automation and communications engineering, electronics
This work was supported in part by the Academy of Finland under Grant 319059 (Coded Collaborative Caching for Wireless Energy Efficiency) and Grant 318927 (6Genesis Flagship), in part by the Riitta Jorma J. Takasen Foundation, in part by the Nokia Foundation, in part by the Walter Ahlström Foundation, and in part by the Tauno Tönning Foundation.
|Academy of Finland Grant Number:||
319059 (Academy of Finland Funding decision)
318927 (Academy of Finland Funding decision)
© The Author(s) 2023. This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/.