Method for dynamically determining sensing time in cognitive radio network

摘要

The present invention is related to an iterative method for dynamically determining sensing time in cooperative secondary cognitive radio network comprising a plurality of cognitive nodes, said method comprising the steps of:
a) each secondary cognitive nodes sensing the presence of a radio signal pertaining to a primary network during a predetermined period of time;
b) each secondary cognitive nodes sending the results of sensing to a coordinating node globally deciding upon the presence of a primary network signal;
c) depending on the presence of the primary network signal, secondary nodes transmitting a communication signal pertaining to the communication in the secondary network;
d) each secondary nodes determining upon current and past local and global conditions the sensing duration to be used in the next iteration, said determination maximising the secondary nodes throughputs,
step a to d being iteratively performed,
wherein the maximisation of the secondary nodes throughputs is performed by minimising for each node a cost function which decreases if the difference between the realised throughput and a required throughput decreases.