Number refilling method applied to 3G (third generation) network and communication monitoring system

Abstract

The invention provides a number refilling methodapplied to a 3G (third generation) network and a communication monitoring system. The number refilling method comprises the following steps: monitoring a UE (user equipment) preset service process on an interface A, and acquiring the IMSI (international mobile subscriber identity), initial TMSI (temporary mobile subscriber identity), initial location area code, effective TMSI and effective location area code of the UE which are carried in a signalling of the preset service process; judging whether a mapping relation between the IMSI and TMSI of the UE is stored, if the mapping relation is stored, substituting the effective TMSI and the effective location area code for the TMSI and location area code in the mapping relation of the UE; if the mapping relation is not stored, generating the mapping relation between the IMSI and the TMSI and storing the mapping relation; and monitoring the shutdown process of the UE on an IU-CS interface (theinterface between the RNC and the circuit switched core network), and acquiring the TMSI and location area code of the UE which are carried in the signalling of the shutdown process; and inquiring the mapping relation between the IMSI and TMSI of the UE according to the TMSI and location area code of the UE which are carried in the signalling of the shutdown process to determine the IMSI of the UE. According to the invention, the real identity of the UE can be determined by monitoring the shutdown process of the UE on the IU-CS interface.

Description

Number backfill method and communication monitoring system applied to 3G network technical field The invention relates to the technical field of communication, in particular to a number backfill method and a communication monitoring system applied to a 3G network. Background technique In a mobile communication system, each mobile UE (UserEquipment) is identified by a unique IMSI (InternationalMobileSubscriberIdentity, International Mobile Subscriber Identity). In order to ensure the security of user information, in normal business communication, TMSI ( TemporaryMobileSubscriberIdentity, temporary mobile subscriber identity) replaces the IMSI to identify the user. The TMSI is a temporary identifier, which can be allocated to different users at different times, and the TMSIs allocated to the same user at different times or in different places are often different. The IU-CS interface refers to the interface between the RNC (RadioNetworkController, radio network controller) ...

AI Technical Summary

Problems solved by technology

When detecting and monitoring the shutdown process of the UE, only the TMSI of the user can be monitored. Since the mobile UE and the TMSI do not have a unique mapping relationship, the true identity of the UE cannot be known based on the monitored TMSI when the UE is powered off.

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