| 摘要 |
<p>Fraud detection provided on a mobile handset for a radio network, allows detection to take place immediately. User behaviour is recorded within the SIM card of the mobile handset, by building a subscriber signature. Fraud detection techniques can be applied to this usage data. The location of the usage can be determined, e.g. by determining cell identity in a cellular system, or network identity for roaming usage. If the usage is identified as potentially fraudulent, action can be taken such as locking the handset. Use can thus be restricted to particular predetermined locations. Fraud can be deterred since much fraud involves use at locations far from the user's home cell. User behaviour can be captured by recording and maintaining call data such as call duration and destination. The dialled numbers can also be checked against a list of ‘hot’ numbers, numbers known to the operators as suspicious.</p> |
