Open AccessJoint cache policy and transmit power for cache‐enabled D2D networks
Author(s) -
Long Yanshan,
Wu Dan,
Cai Yueming,
Qu Junyue
Publication year - 2017
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.2017.0025
Subject(s) - cache , computer science , transmitter power output , joint (building) , cellular network , power (physics) , mathematical optimization , efficient energy use , interference (communication) , focus (optics) , computer network , mathematics , electrical engineering , channel (broadcasting) , quantum mechanics , engineering , optics , architectural engineering , transmitter , physics
The cache‐enabled device‐to‐device (D2D) communication is a burgeoning technique to offload cellular traffic. In this study, the authors conducted the joint cache policy and transmit power to maximise the content‐related energy efficiency (CREE) for the cache‐enabled D2D network. Specifically, the authors model the random distribution of mobile users by the Poisson point process and derive the closed‐form CREE via considering the D2D establishment threshold and signal‐to‐interference ratio threshold at the same time. Then the authors aim to determine the optimal cache policy and transmit power for maximising the CREE in two practical cases, respectively. Since the optimisation problem in both cases are non‐linear non‐convex problems and share the same mathematical form, the authors focus on the first case and propose a two‐step iterative algorithm to find a stationary solution due to its intractability. This iterative algorithm builds on two subproblems which are proved to have optimal solutions. Numerical simulations show that the joint optimisation can obtain more than two times the CREE compared with either of the single optimisation for cache policy or transmit power.