Caching policies for delay minimization in small cell networks with coordinated multi-point joint transmissions

Ricardo, Guilherme I.; Tuholukova, Alina; Neglia, Giovanni; Spyropoulos, Thrasyvoulos
IEEE/ACM Transactions on Networking, March 2021

In 5G and beyond network architectures, operators and content providers base their content distribution strategies on Heterogeneous Networks, where macro and small cells
are combined to offer better Quality of Service to wireless users. On top of such networks, edge caching and Coordinated Multi-Point (CoMP) joint transmissions are used to further
improve performance. In this paper, we address the average delay minimization problem by first formulating it as a static optimization problem. Even though the problem is NP-hard we are able to solve it via an efficient algorithm that guarantees a 1/2 -approximation ratio. We then proceed to propose two fully distributed and dynamic caching policies for the same problem. The first one asymptotically converges to the static optimal solution under the Independent Reference Model (IRM). The second one provides better results in practice under real (nonstationary) request processes. Our online policies outperform
existing dynamic solutions that are PHY-unaware.

DOI
HAL
Type:
Journal
Date:
2021-03-10
Department:
Communication systems
Eurecom Ref:
6480
Copyright:
© 2021 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

PERMALINK : https://www.eurecom.fr/publication/6480