Wireless communication system using hybrid cooperative and noncooperative sensing

摘要

A combination of cooperative and non-cooperative sensing methods improves spectrum utilization by switching network nodes not interfering with both primary system and cooperative secondary users to non-cooperative mode. The method then keeps record of the number of times the result of spectrum sensing of a network node matches or differs from the result of cooperative sensing. Also, the method sets thresholds to shift register values to determine when to switch back and forth between cooperative and non cooperative sensing modes, and sending control messages to let a non cooperative user access the spectrum. In the present disclosure two antenna are considered for each network node to separate the two types of control messages or broadcast and reply messages.

主权项

1. A spectrum sensing method in a communication system comprising:
sensing a shared spectrum with a cognitive radio that is one of a plurality of cognitive radios; switching the cognitive radio, non interfering cognitive radios of the plurality of cognitive radios and cooperative secondary users to a non-cooperative mode; keeping a record of a number of times a result of spectrum sensing of the cognitive radio of the plurality of cognitive radios matches a result of cooperative sensing; setting a threshold in a shift register value to determine when to switch between cooperative and non-cooperative sensing modes based on comparing the shift register value to the threshold; and sending a control message to provide the non-cooperative cognitive radios of the plurality of cognitive radios access to the spectrum.