What is sum rate maximization?
The optimization problems in CRNs with a sum rate maximization objective aims to maximize total system throughput in CRNs with the interference constraints (ie, at the PUs) and total power constraints [119].
What is sum rate in communication?
"sum-rate" is just the sum of all rates of communications happening in a network. The statement is pretty self-evident: The more time your nodes can communicate, the more data they can transfer.