Distributed edge caching in ultra-dense fog radio access networks : a mean field approach
Hu, Yabai; Jiang, Yanxiang; Bennis, Mehdi; Zheng, Fu-Chun (2019-04-15)
Y. Hu, Y. Jiang, M. Bennis and F. Zheng, "Distributed Edge Caching in Ultra-Dense Fog Radio Access Networks: A Mean Field Approach," 2018 IEEE 88th Vehicular Technology Conference (VTC-Fall), Chicago, IL, USA, 2018, pp. 1-6. doi: 10.1109/VTCFall.2018.8690593
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https://urn.fi/URN:NBN:fi-fe202002195841
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Abstract
In this paper, the edge caching problem in ultra-dense fog radio access networks (F-RAN) is investigated. Taking into account time-variant user requests and ultra-dense deployment of fog access points (F-APs), we propose a dynamic distributed edge caching scheme to jointly minimize the request service delay and fronthaul traffic load. Considering the interactive relationship among F-APs, we model the caching optimization problem as a stochastic differential game (SDG) which captures the temporal dynamics of F-AP states and incorporates user requests status. The SDG is further approximated as a mean field game (MFG) by exploiting the ultra-dense property of F-RAN. In the MFG, each F-AP can optimize its caching policy independently through iteratively solving the corresponding partial differential equations without any information exchange with other F-APs. The simulation results show that the proposed edge caching scheme outperforms the baseline schemes under both static and time-variant user requests.
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