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Efficient Content Caching for Delivery Time Minimization in the LEO Satellite Networks
Bhandari, Sovit; Vu, Thang Xuan; Chatzinotas, Symeon et al.
2023In 2023 IEEE International Conference on Communications Workshops (ICC Workshops)
Peer reviewed
 

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Keywords :
caching; precoding; multicasting; optimization; LEO satellite; beamforming
Abstract :
[en] Next-generation multi-spot beam satellite systems open a new way to design low earth orbit (LEO) satellite communication systems with full flexibility in managing bandwidth, transmit power, and spot beam coverage, enabling the adoption of spatial multiplexing techniques to meet the unprecedented demand for future mobile traffic. However, conventional spatial multiplexing techniques perform poorly in satellite systems due to high correlation between the satellite channels, resulting in inefficient mitigation of inter-user interference. In this paper, we exploit the flexibility of multi-spot beam LEO satellites and consider the geographic distribution of users to improve the performance of LEO satellite-assisted edge caching systems. Our goal is to jointly optimize the beam coverage, bandwidth and transmit power and minimize the cache delivery time. In particular, the spot beam coverage is optimized by using the K-means algorithm applied to the realistic user demands, followed by a proposed successive convex approximation (SCA)-based iterative algorithm for optimizing the radio resources. Simulations shows that our optimal approach outperforms the conventional precoding-based approach and also shows a significant improvement in the minimization of the maximum content delivery time.
Disciplines :
Electrical & electronics engineering
Author, co-author :
Bhandari, Sovit ;  University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom
Vu, Thang Xuan  ;  University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom
Chatzinotas, Symeon  ;  University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom
Ottersten, Björn ;  University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT)
External co-authors :
no
Language :
English
Title :
Efficient Content Caching for Delivery Time Minimization in the LEO Satellite Networks
Alternative titles :
[en] Efficient Content Caching for Delivery Time Minimization in the LEO Satellite Networks
Publication date :
01 June 2023
Event name :
WS15 IEEE ICC 2023 3rd Workshop on Satellite Mega-Constellations in the 6G Era (6GSatComNet'23)
Event organizer :
ICC
Event place :
Rome, Italy
Event date :
28-05-2023 to 01-06-2023
Audience :
International
Main work title :
2023 IEEE International Conference on Communications Workshops (ICC Workshops)
Publisher :
IEEE
Peer reviewed :
Peer reviewed
Focus Area :
Security, Reliability and Trust
FnR Project :
FNR14016225 - Integrated Satellite-terrestrial Systems For Ubiquitous Beyond 5g Communications, 2020 (01/10/2020-30/09/2026) - Symeon Chatzinotas
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since 08 May 2023

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