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Joint caching policies for optimizing energy costs/offloading probability for D2D and millimeter‐wave small cell underlaying cache‐enabled networks
Author(s) -
Zhao Jihong,
Wang Weipeng,
Qu Hua,
Zhao Shuyuan,
Ren Gongye
Publication year - 2020
Publication title -
transactions on emerging telecommunications technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.366
H-Index - 47
ISSN - 2161-3915
DOI - 10.1002/ett.3804
Subject(s) - cache , computer science , base station , computer network , joint (building) , cellular network , wireless , user equipment , efficient energy use , small cell , telecommunications , engineering , architectural engineering , electrical engineering
Cache‐enabled networks are a promising solution to high video traffic, which allows popular files to cache at the user equipment (UE) and base stations (BSs). To improve the efficiency of file transmission, we adopt full‐duplex (FD) radio technology and millimeter‐wave small BSs ( mm SBSs) in our network scenario. In this paper, users can get their required files via one of self‐communication, FD device‐to‐device (D2D) communication, mm SBS communication and macro BS (MBS) communication. Different communication modes have different energy costs. To minimize energy costs/maximize offloading probability, we analyze the successful probability for users to obtain files by different communication modes and propose an optimal joint caching policy for UE and mm SBSs. Based on the impact between UE and mm SBSs' caching policy, a suboptimal joint caching policy is proposed. The numerical results shown our optimal joint caching policy can improve the performance of cache‐enabled networks effectively and the suboptimal joint caching policy is more closer to the optimal caching policy than other common caching policies.