Joint Optimization of File Placement and Delivery in Cache-Assisted Wireless Networks

Lv, Bojie1; Wang, Rui1; Cui, Ying2; Tan, Haisheng3

10.1109/GLOCOM.2018.8647797

2018

2334-0983

2018 IEEE GLOBAL COMMUNICATIONS CONFERENCE (GLOBECOM)

Abu Dhabi, United arab emirates

345 E 47TH ST, NEW YORK, NY 10017 USA

IEEE

In this paper, the downlink file transmission in one cell with the assistance of cache nodes is studied. Specifically, the base station (BS) reactively delivers files to cache nodes and a requesting user in a multicast manner. Therefore, one file transmission may lead to the cache status update, which further affects the future file transmissions. We consider the joint optimization of file placement and delivery. In particular, we first formulate the optimization of transmission power and time in one finite file lifetime as a Markov Decision Process (MDP) with a random number of stages, where the objective is to minimize the transmission resource at the BS. It is shown that the optimal solution can be obtained via a revised Bellman's equation. Due to the curse of dimensionality, a novel approximation approach is proposed, where the value functions of the Bellman's equation can be calculated from analytical expressions. Hence, iterative algorithms, which appear in the general approximate MDP solutions, can be avoided. Moreover, an bound on the approximation error is also provided.

第一 ; 通讯

英语

CPCI-S ; EI

Shenzhen Science and Technology Innovation Committee[JCYJ2016033111545794]

Engineering ; Telecommunications

Engineering, Electrical & Electronic ; Telecommunications

WOS:000465774304015

20191306709061

Iterative methods ; Markov processes

Radio Systems and Equipment:716.3 ; Numerical Methods:921.6 ; Probability Theory:922.1

Web of Science

1.Southern Univ Sci & Technol, Shenzhen, Peoples R China
2.Shanghai Jiao Tong Univ, Shanghai, Peoples R China
3.Univ Sci & Technol China, Hefei, Anhui, Peoples R China

Lv, Bojie,Wang, Rui,Cui, Ying,et al. Joint Optimization of File Placement and Delivery in Cache-Assisted Wireless Networks[C]. 345 E 47TH ST, NEW YORK, NY 10017 USA:IEEE,2018.