Patent ID: 8254844

Claim:
A method of transmitting a signal in a secondary communications system comprising: estimating, by a secondary mobile station in the secondary communications system, a received signal polarization of at least one protected signal in a primary spectrum of a primary communications system; estimating, by the secondary mobile station, an interference contribution by the secondary station transmission of the secondary communications system to the at least one protected signal of the primary communications system on the basis of the estimated received polarization signal of the at least one protected signal; determining, by the secondary mobile station, a transmission configuration of the secondary mobile station transmission in the primary spectrum of the primary communications system on the basis of estimated interference contribution, wherein the transmission configuration meets an interference contribution criteria, the interference contribution criteria being determined based at least on an acceptable desired to undesired interference protection ratio for the at least one protected signal of the primary communications system; and transmitting from the secondary mobile station using the determined transmission configuration.