Orthogonal Multipoint Multicast Caching in OFDM Cellular Networks with ICI and IBI

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Abstract

We consider optimal cache placement and delivery for Orthogonal Multipoint Multicasting (OMPMC) cellular systems. In OMPMC, all Base Stations (BSs) that cache a file transmit identical signals in a dedicated frequency resource. The simultaneous transmissions create artificial multipath propagation, which creates Inter-Block Interference (IBI) and Inter-Carrier Interference (ICI) in Orthogonal Frequency Division Multiplexing systems where the Cyclic Prefix (CP) is shorter than the maximum propagation delay. The placement of files at BS caches is based on a probabilistic model. A file request is in outage if the average signal-to-interference-and-noise ratio associated with a request is less than a threshold. We formulate the cache policy and bandwidth allocation as a joint optimization problem aiming to minimize the total outage probability, and considering the effect of IBI and ICI. Despite that the outage probability does not have a closed form expression, we are able to devise an algorithm to find the optimal solution based on predictor-corrector approach. Simulations results are used to demonstrate the capability of the proposed algorithm to find the optimum cache policy. Simulation results show that the effect of ICI/IBI has to be considered in designing OMPMC caching policy.
Original languageEnglish
Title of host publicationProceedings of the IEEE 32nd Annual International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2021
PublisherIEEE
Pages394-399
Number of pages6
ISBN (Electronic)9781728175867
DOIs
Publication statusPublished - 22 Oct 2021
MoE publication typeA4 Article in a conference publication
EventIEEE International Symposium on Personal, Indoor, and Mobile Radio Communications - Virtual, Online
Duration: 13 Sep 202116 Sep 2021
Conference number: 32

Conference

ConferenceIEEE International Symposium on Personal, Indoor, and Mobile Radio Communications
Abbreviated titlePIMRC
CityVirtual, Online
Period13/09/202116/09/2021

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