Joint Long-Term Cache Allocation and Short-Term Content Delivery in Green Cloud Small Cell Networks
Refereed conference paper presented and published in conference proceedings

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AbstractRecent years have witnessed an exponential growth of mobile data traffic, which may lead to a serious traffic burn on the wireless networks and considerable power consumption. Network densification and edge caching are effective approaches to addressing these challenges. In this study, we investigate joint long-term cache allocation and short-term content delivery in cloud small cell networks (C-SCNs), where multiple small-cell BSs (SBSs) are connected to the central processor via fronthaul and can store popular contents so as to reduce the duplicated transmissions in networks. Accordingly, a long-term power minimization problem is formulated by jointly optimizing multicast beamforming, BS clustering, and cache allocation under quality of service (QoS) and storage constraints. The resultant mixed timescale design problem is an anticausal problem because the optimal cache allocation depends on the future file requests. To handle it, a two-stage optimization scheme is proposed by utilizing historical knowledge of users’ requests and channel state information. Specifically, the online content delivery design is tackled with a penalty-based approach, and the periodic cache updating is optimized with a distributed alternating method. Simulation results indicate that the proposed scheme significantly outperforms conventional schemes and performs extremely close to a genie-aided lower bound in the low caching region.
Acceptance Date04/02/2019
All Author(s) ListXiongwei WU, Qiang LI, Xinhua LI, Victor C.M. LEUNG, P.C. CHING
Name of Conference2019 IEEE International Conference on Communications
Start Date of Conference20/05/2019
End Date of Conference24/05/2019
Place of ConferenceShanghai
Country/Region of ConferenceChina
Proceedings TitleProceedings IEEE ICC 2019
Place of PublicationUSA
LanguagesEnglish-United States
KeywordsCache Allocation, Content Delivery, Small Cell Networks, joint optimization, multicast beamforming

Last updated on 2020-07-04 at 00:42