Research Article

Cross-Layer Throughput Optimization in Cognitive Radio Networks with SINR Constraints

Table 1

Notations.

Symbol Meaning

Set of secondary users
Number of secondary users
Set of potential links
Network graph
Set of available channels
Number of available channels
Set of links incident on node
Set of available channels at node
Set of available channels at link
Number of radio interfaces at node
Transmission range for node
Interference range for node
Guard zone
Set of links that have simultaneous transmissions with link by using a same channel
Set of links that have simultaneous transmissions with link by using channel
Common transmission power
Noise power at node
Interference power at node
Noise power at each node
The minimum threshold to decode a transmission at a receiver
Distance between nodes and
Propagation gain from node to node
Path loss exponent
Binary variable indicating if link is active on channel
Capacity of link by using channel
Minimum end-to-end flow throughput
Bandwidth of a channel
Number of communication sessions
Source node for session
Destination node for session
Traffic flow from to for session
Traffic flow from to for session