Edge caching for coverage and capacity-aided heterogeneous networks

Ejder Bastug (1, 2) , Mehdi Bennis (3) , Marios Kountouris (4) , Merouane Debbah (1, 2)

1 Chaire Radio Flexible - Chaire Radio Flexible Alcatel-Lucent/Supélec
2 LANEAS - Large Networks and Systems Group
3 CWC - Centre for Wireless Communications [University of Oulu]
4 Huawei Technologies France [Boulogne-Billancourt]

—A two-tier heterogeneous cellular network (HCN) with intra-tier and inter-tier dependence is studied. The macro cell deployment follows a Poisson point process (PPP) and two different clustered point processes are used to model the cache-enabled small cells. Under this model, we derive approximate expressions in terms of finite integrals for the average delivery rate considering inter-tier and intra-tier dependence. On top of the fact that cache size drastically improves the performance of small cells in terms of average delivery rate, we show that rate splitting of limited-backhaul induces non-linear performance variations, and therefore has to be adjusted for rate fairness among users of different tiers.

Keywords: Index Terms—edge caching; clustered point processes; hetero- geneous cellular networks; stochastic geometry

Domains: Computer Science [cs]; Information Theory [cs.IT]

Ejder Bastug, Mehdi Bennis, Marios Kountouris, Merouane Debbah. Edge caching for coverage and capacity-aided heterogeneous networks. 2016 IEEE International Symposium on Information Theory (ISIT), Jul 2016, Barcelona, Spain. ⟨10.1109/ISIT.2016.7541306⟩. ⟨hal-01789331⟩