Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1997-05-05
2000-09-12
To, Doris H.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455435, 455456, H04Q 700
Patent
active
061190004
ABSTRACT:
In a mobile radio network such a GSM network, an operative identity code is passed by a mobile station to the fixed network part at the start of each communication transaction. This operative identity code will either be the unique identity code (IMSI) assigned to the mobile-station user or, more usually, a temporary, substitute, identity code (TMSI) allocated by the fixed network part with a view to obscuring the identity of the user to anyone monitoring the network radio traffic. Whilst the fixed network infrastructure knows the association between a temporary identity code (TMSI) and the corresponding unique identity code (IMSI) of a user, this information is generally not readily accessible. To enable the current temporary identity code (TMSI) of a user to be readily tracked without burdening the network infrastructure, a monitoring arrangement is provided which monitors network signalling messages to link the different messages associated with a particular user mobile station that separately give the current operative identity code (line "c") and assign a successor operative identity code to that user (line "h"). In one embodiment applicable to a GSM network, messages on the A interface that carry identity code information for a particular user during a communication transaction are linked through the local references of the SCCP connection established for the transaction. In a second embodiment, also applicable to GSM, messages on the Abis interface are monitored and linked through the channel numbers contained in these messages.
REFERENCES:
patent: 5561840 (1996-10-01), Alvesalo et al.
patent: 5734699 (1998-03-01), Lu et al.
patent: 5818824 (1998-10-01), Lu et al.
patent: 5854982 (1998-12-01), Chambers et al.
European Search Report--EP-96-30-3147.
"GSM Signalisierung in der Praxis" XP000534209, 11450 ITG Specialist Report, Sep. 1993, No. 124, pp. 423-432, Berlin, Germany, with English Translation.
Bennett Steven Nicholas
Bonner David
Schiefer Jan
Stephenson David Arthur
Ahn Thomas B.
Hewlett--Packard Company
To Doris H.
LandOfFree
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