Open AccessOutage and delay performance of content caching in two‐tier cooperative cellular networks
Author(s) -
Rostami Ghadi Farshad,
Javan Mohammad Reza
Publication year - 2019
Publication title -
iet communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.355
H-Index - 62
eISSN - 1751-8636
pISSN - 1751-8628
DOI - 10.1049/iet-com.2018.5496
Subject(s) - computer science , automatic repeat request , base station , computer network , transmission (telecommunications) , cellular network , transmission delay , poisson distribution , cache , algorithm , hybrid automatic repeat request , telecommunications link , telecommunications , statistics , mathematics
The authors consider a content‐centric two‐tier heterogeneous cellular network where the macro base stations (MBSs) and small base stations (SBSs) are spread based on two independent Poisson point processes. The set of contents are stored in the MBSs while a subset of the contents which are the most popular are cached in the SBSs. We assume that there is no direct link between the MBSs and the users, and users send their content requests to their nearest SBS. If the SBS has not the requested content, the nearest MBS to the serving SBS serves the user through that SBS. Furthermore, the authors incorporated the automatic repeat request (ARQ)‐based transmission with a fixed number of the ARQ rounds, and analyse the delay experienced by users. The authors obtained closed‐form expressions for the average outage probability and the average delay in case of successful ARQ transmission. It is shown that the content distribution based on popularity decreases the average outage probability and average delay. Also, it is shown that the transmission from MBS to the user through SBS improves the performance in terms of average outage probability and average delay. Finally, using simulations the authors study the proposed schemes for different network parameters.