Social-Aware Caching Strategy Based on Joint Action Deep Reinforcement Learning

Table 1

Summary of notations.

Notation	Interpretation
	The number of active users
	The number of inactive users
	Remaining space size of inactive user
	Delay of download contents
	Delay threshold
	Trust degree between user m and user
	Similarity between user and user
	Cache hit ratio
	State at decision epoch
	A joint action at a decision epoch
	Reward at a decision epoch
	Discount rate
	Explore rate