English to Chinese Other Telecom(munications)

Like in other mobile communication systems, the communication between the base station and the user equipment in the OFDM systems is performed through the so called radio interface. To establish/maintain such communication, special synchronization methods have been developed. The ruling patent describes in this context that when the synchronization scheme is defined for a communication system, several parameters should, of course, be evaluated so that the system operates in an optimal way.
ruling patent 是什么意思？