Joint Channel Assignment and Power Allocation Based on Maximum Concurrent Multicommodity Flow in Cognitive Radio Networks

Table 1

Nomenclature.

Symbol	Definition
	CR-aware nodes indices
	Path loss index
	Session index
	Set of the total available channels
	Common available channels between nodes and
	Maximum number of power control levels
	Maximum transmit power
	Binary variables represent the channel state between nodes and and nodes and respectively
	Signal to interference ratio on channel between nodes and
	SINR threshold value to avoid weak channels
	Quantization variable for power control on channel between nodes and and nodes and respectively
	Path losses between nodes and and between nodes and , respectively
	Channel capacity between nodes and on channel u
	Bandwidth of channel
	Flow rate on session passing from nodes to and flow between nodes and
	Minimum flow rate demand during session
λ	Session flow rate scaling factor
	Source node and destination node respectively
	Thermal Gaussian noise
	Number of CR-aware nodes
	Number of primary users
	Set of available sessions for the entire network