A Multidepth Load-Balance Scheme for Clusters of Congested Cells in Ultradense Cellular Networks

Table 2

Summary of notations.

Symbol	Description
	The set of small cells
	The set of users
	The set of users that can be served by small cell
	The set of adjacent small cells of small cell
	The set of small cells covers user
	The number of resource blocks of small cell
	The indicator function, which is 1 if small cell serves user , and 0 otherwise
	The data rate of a resource block allocated by small cell to user
	The total data rate provided by small cell to user
	The data rate requirement of user
	The number of consumed resource blocks of small cell for satisfying the data rate requirement of user
	The set of overloading small cells
	The loading threshold of being an overloaded cell