Patent ID: 8483629
Filing Date: 2013-07-09
Classification: H04B,H04W

Abstract:
1. A method, comprising: transmitting, by a radio device of a secondary communication system, a signal into a channel of a primary communication system, where the signal that is transmitted is a probing signal having at least a predetermined temporally varying transmission pattern; monitoring, by the radio device, channel signal quality-related feedback of the primary system; determining, by the radio device, based on the monitored channel signal quality-related feedback, an amount of mutual coupling between the transmitted signal and the channel, if any, caused by the transmitted signal, where determining comprises correlating at least the predetermined temporally varying transmission pattern with changes, if any, in the monitored channel signal quality-related feedback; and if the amount of determined mutual coupling is less than a threshold amount, using by the radio device, the channel for communication with another radio device of the secondary communication system.