A Novel Cooperative Cache Policy for Wireless Networks

Table 1

The comparison of the related work policies.

Policy category	Weakness	The improvement by CPP-CC policy
(1) Zhao et al. [19]; (2) Cheng et al. [20]	These policies do not include BS cooperation, which results in duplicate content being cached and further wasting limited cache capacity.	The SBSs in the CPP-CC policy can exchange information with each other. In particular, the SBSs in the same cluster can share their cached content.
(1) Xu et al. [21]; (2) Zhou et al. [22]; (3) Ye et al. [23]; (4) Poularakis and Tassiulas [7]; (5) Somesula et al. [24]	These policies assume that content popularity is static, and therefore they cannot be used for the dynamic cache scenario.	CPP-CC policy utilises LSTM neural network to predict the dynamic content popularity.
(1) Thar et al. [25]; (2) Yan et al. [27]	These policies do not consider user mobility.	The MBS should only serve fast-moving users in this work, and the SBS serves slow-moving users.
(1) Mou et al. [26]; (2) Rathore et al. [28]	These policies do not consider the relationship between HetNet layer properties and user mobility.