Method for generating a temporary mobile subscriber identity signal (TMSI) from a permanent mobile station identity signal (TMSI)
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United States of America Patent
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Dec 20, 1994
Grant Date -
N/A
app pub date -
Jun 11, 1992
filing date -
Jun 14, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of determining a temporary subscriber number (TMSI) in a subscriber data base is disclosed. Subscriber data bases with large subscriber-data fluctuations require special strategies to ensure optimum utilization of the available storage space while keeping access times as short as possible. In addition, subscriber anonymity is to be ensured. A method is provided for assigning a memory location to each subscriber via a temporary subscriber number (4-byte TMSI). The invention uses an internal structure for the TMSI which consists of several logically independent elements which, on the one hand, permit as large an addressing range as possible and, on the other hand, preclude any confusion of data records or any identification of the subscriber. In addition, the TMSI is constantly changed. With a 32-bit TMSI, up to 10.sup.6 subscribers can be unambiguously addressed.
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