Joint Caching in Fronthaul and Backhaul Constrained C-RAN

Document Type

Conference Proceeding

Publication Date

1-1-2017

Abstract

Caching popular contents closer to users has been proposed to alleviate wireless network traffic and improve user quality of experience (QoE). Decisions on where and what to cache is of great importance. In this paper, we propose a hierarchical cache-enabled cloud radio access network (C-RAN) architecture where joint caching is considered in both remote radio heads (RRHs) and baseband units (BBUs) with the constraints of backhaul and fronthaul links. We formulate the content placement problem as an integer linear programming (ILP) model with the objective of minimizing the average content download time. A heuristic algorithm is proposed in order to reduce the time complexity. Simulation results of the average download delay are analyzed from different aspects including caching locations, total file lengths, cache sizes and file popularities, and they demonstrate that the performance of the proposed popularity-based algorithm approximates ILP solutions closely but with high time efficiency.

Identifier

85046375428 (Scopus)

Publication Title

Proceedings IEEE Global Communications Conference Globecom

External Full Text Location

https://doi.org/10.1109/GLOCOM.2017.8254679

e-ISSN

25766813

ISSN

23340983

First Page

1

Last Page

6

Volume

2018-January

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