Dynamic hierarchical collaborative caching scheme in ultra-dense networks 
陈嘉宁 李曦 纪红 张鹤立
Dynamic hierarchical collaborative caching scheme in ultra-dense networks
Chen Jianing, Li Xi, Ji Hong, Zhang Heli
中国邮电高校学报(英文版) . 2021, (1): 78 -86 .  DOI: 10.19682/j.cnki.1005-8885.2021.0001