Joint Fronthaul Multicast and Cooperative Beamforming for Cache-Enabled Cloud-Based Small Cell Networks: An MDS Codes-Aided Approach
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AbstractThe performance of cloud-based small cell networks (C-SCNs) relies highly on a capacity-limited fronthaul, which degrade quality of service when it is saturated. Coded caching is a promising approach to addressing these challenges, as it provides abundant opportunities for fronthaul multicast and cooperative transmissions. This paper investigates cache-enabled C-SCNs, in which small-cell base stations (SBSs) are connected to the central processor via fronthaul, and can prefetch popular contents by applying maximum distance separable (MDS) codes. To fully capture the benefits of fronthaul multicast and cooperative transmissions, an MDS codes-aided transmission scheme is first proposed. We formulate the problem to minimize the content delivery latency by jointly optimizing fronthaul bandwidth allocation, SBS clustering, and beamforming. To efficiently solve the resulting nonlinear integer programming problem, we propose a penalty-based design by leveraging variational reformulations of binary constraints. To improve the solution of the penalty-based design, a greedy SBS clustering design is also developed. Furthermore, closed-form characterization of the optimal solution is obtained, through which the benefits of MDS codes can be quantified. The simulation results are given to demonstrate the significant benefits of the proposed MDS codes-aided transmission scheme.
All Author(s) ListXiongwei Wu, Qiang Li, Victor C. M. Leung, P. C. Ching
Journal nameIEEE Transactions on Wireless Communications
Volume Number18
Issue Number10
Place of PublicationUSA
Pages4970 - 4982
LanguagesEnglish-United States
KeywordsFronthaul multicast, cooperative beamforming, cloud-based small cell networks (C-SCNs), maximum distance
separable (MDS) codes

Last updated on 2020-04-12 at 23:22