An Intelligent Caching and Replacement Strategy Based on Cache Profit Model for Space-Ground Integrated Network

Algorithm 1

Cache replacement management.

	Input: user request content , cache profit , time of diminishing returns
	for every content requested by the user
	if is in the cache;
	Update information;
	cache profit update, insert the cache stack;
	else cache miss
	request the relevant routing table of from the SDN controller;
	while there is not enough space in the cache for ;
	delete the object at the bottom of the cache stack ;
	end while
	calculate cache profit of and the rate of profit decay;
	insert the cache stack
	end if
	sort content by cache profit
	end for