Adaptive Delay Optimization of Multicast-Enabled Coded Caching in Device-to-Device Networks  

作　　者：Liang Zhong Xueqian Zheng Jie Lin Yang Cao Shenggen Ju 

机构地区：[1]China University of Geosciences School of Mechanical Engineering and Electronic Information,Department of Electronics and Information Engineering,Wuhan 430027,China [2]Huazhong University of Science and Technology,Wuhan 430027,China [3]Sichuan University,Department of Computer Network and Communication,Chengdu 610207,China

出　　处：《China Communications》2020年第1期42-48,共7页中国通信（英文版）

基　　金：partly supported by the National Natural Science Foundation of China (No.61601334,61601509)

摘　　要：This letter investigates a delay optimization problem in device-to-device(D2D)networks where users have pre-downloaded subfiles following a coded caching rule.Due to acquiring rest subfiles,users may suffer both receiving and transmitting delays.To achieve the delay minimization,we first propose a delay-aware mode-selection strategy to adaptively choose multicast or D2D communications mode to reduce the receiving-caused delay.By matching these transmit modes with distinct subfile sizes,we further formulate a min-max optimization problem to minimize the delivery delay.Finally,numerical results prove that the proposed scheme outperforms existing ones in terms of both receiving and transmitting delays.This letter investigates a delay optimization problem in device-to-device(D2D) networks where users have pre-downloaded subfiles following a coded caching rule. Due to acquiring rest subfiles, users may suffer both receiving and transmitting delays. To achieve the delay minimization, we first propose a delay-aware mode-selection strategy to adaptively choose multicast or D2D communications mode to reduce the receiving-caused delay. By matching these transmit modes with distinct subfile sizes, we further formulate a min-max optimization problem to minimize the delivery delay. Finally, numerical results prove that the proposed scheme outperforms existing ones in terms of both receiving and transmitting delays.

关 键 词：coded caching delay optimization MULTICAST device-to-device 

分 类 号：TN929.5[电子电信—通信与信息系统]