UNAUTHORIZED CALL ACTIVITY DETECTION IN A CELLULAR COMMUNICATION SYSTEM

摘要

A cellular communication system (100) includes a subscriber unit (101) having an associated subscriber identity. The subscriber unit (101) transmits call log data over an air interface communication link. The call log data is generated locally in the subscriber unit (101). A billing processor (117) generates billing data for the subscriber unit (101). The billing data can be generated in the fixed network in response to characteristics and the operation of the fixed network. A call activity processor (119) comprises a call log data processor (203) which receives the call log data from the cellular subscriber unit (101) and a billing data processor (205) which receives subscriber unit specific billing data from the billing processor (117). A comparison processor (207) then compares the billing data and the call log data and determines if unauthorized call activity has occurred.