For a hierarchical network consisting of a server, multiple relays and multiple users, this paper studies on how to utilize cache at user and relay nodes to reduce the transmission delay. We propose novel coded caching schemes for the centralized and decentralized settings respectively. Our centralized scheme achieves better performance but requiring a fixing number of users, and our decentralized scheme supports flexible network change with only small loss of performance. Both schemes combine the traditional caching technology with network coding, and exploit the relays' cache resource to assist the transmission between the server and users. Moreover, our schemes allow parallel transmission between the server and relay, and achieve multicast gain by using coding during the delivery phase. The simulation results show that compared to the previous scheme, our schemes can greatly reduce the transmission delay without increasing the caching size.
WANG Ke
,
CHEN Jiahui
,
WU Youlong
. Coded caching in hierarchical network with centralized and decentralized strategy[J]. Journal of University of Chinese Academy of Sciences, 2022
, 39(2)
: 224
-231
.
DOI: 10.7523/j.ucas.2020.0017
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