Decentralized coded caching in wireless networks: trade-off between storage and latency

Girgis Bebawy, Antonious Mamdouh and Erçetin, Özgür and Nafie, Mohammed and Elbatt, Tamer (2017) Decentralized coded caching in wireless networks: trade-off between storage and latency. In: IEEE International Symposium on Information Theory, Aachen, Germany (Accepted/In Press)

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This paper studies the decentralized coded caching for a Fog Radio Access Network (F-RAN), whereby two edge nodes (ENs) connected to a cloud server via fronthaul links with limited capacity are serving the requests of Kr users. We consider all ENs and users are equipped with caches. A decentralized content placement is proposed to independently store contents at each network node during the off-peak hours. After that, we design a coded delivery scheme in order to deliver the user demands during the peak-hours under the objective of minimizing the normalized delivery time (NDT), which refers to the worst case delivery latency. An information-theoretic lower bound on the minimum NDT is derived for arbitrary number of ENs and users. We evaluate numerically the performance of the decentralized scheme. Additionally, we prove the approximate optimality of the decentralized scheme for a special case when the caches are only available at the ENs.

Item Type:Papers in Conference Proceedings
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101-6720 Telecommunication
ID Code:32592
Deposited By:Özgür Erçetin
Deposited On:07 Aug 2017 15:59
Last Modified:07 Sep 2017 11:44

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