The invention refers to a method of detecting a jamming transmitter, affecting a communication user equipment, wherein said communication user equipment UE is adapted for communication with a component of a cellular radio network RN having a number of user equipments UE and a number of base node stations BNS, and wherein the cellular radio network RN provides a synchronization channel SCH for synchronization of the user equipment UE to a cell of the cellular radio network RN,the method comprising the steps of: - indicating that the communication user equipment UE is capable of communicating in a cellular code division multiple access CDMA based radio network RN; - testing a match of a uniform synchronization signal sequence of the synchronization channel SCH for detecting of the synchronization channel; - detecting a power indicator UTRA carrier RSSI indicative of an unbiased wide band power of a received radio signal strength and comparing the power indicator to a noise floor threshold; and wherein - a jamming affection of the communication user equipment is indicated, in the case, in particular each indicated by a Boolean value, - the communication indication is on hold; and - the uniform synchronization sequence of the synchronization channel SCH is not matched in the test, and - the power indicator exceeds the noise floor threshold.