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Optimizing Joint Probabilistic Caching and Channel Access for Clustered D2D Networks
Ramy Amer,Mohamed Baza,Tara Salman,M. Majid Butt,Ahmad Alhindi,Nicola Marchetti 한국통신학회 2021 Journal of communications and networks Vol.23 No.6
Caching at mobile devices and leveraging deviceto-device (D2D) communication are two promising approachesto support massive content delivery over wireless networks. Analysis of such D2D caching networks based on a physicalinterference model is usually carried out by assuming uniformlydistributed devices. However, this approach does not capture thenotion of device clustering. In this regard, this paper proposesa joint communication and caching optimization framework forclustered D2D networks. Devices are spatially distributed intodisjoint clusters and are assumed to have a surplus memorythat is utilized to proactively cache files, following a randomprobabilistic caching scheme. The cache offloading gain is maximizedby jointly optimizing channel access and caching scheme. A closed-form caching solution is obtained and bisection searchmethod is adopted to heuristically obtain the optimal channelaccess probability. Results show significant improvement in theoffloading gain reaching up to 10% compared to the Zipf cachingbaseline.
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