| 摘要 |
Methods and systems for monitoring communication of mobile communication terminals, such as cellular phones, that combine passive off-air interception of downlink signals with uplink interception in a manner that exploits the advantages and performance benefits of each modality. Uplink interception may involve reception and/or direction finding. A primary receiver monitors communication between mobile communication terminals and base stations in a wireless communication network. The primary receiver attempts to identify communication sessions that are conducted by certain target terminals. Upon identifying such a communication session, a secondary receiver is invoked to intercept the target terminal. The secondary receiver intercepts the target terminal by receiving uplink signals that the terminal transmits to the base station. |
