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TMSI

 
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Petr
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Joined: 18 Jul 2006
Posts: 72

PostPosted: Tue Dec 19, 2006 5:33 pm    Post subject: TMSI Reply with quote

Какими пределами ограничена "уникальность" TMSI? (TMSI уникален для LAC или MSC)
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Advard II
Бывший сотрудник Seventest


Joined: 24 Oct 2005
Posts: 28
Location: Спб

PostPosted: Tue Dec 19, 2006 5:54 pm    Post subject: Reply with quote

GSM 03.03
Quote:

2.4 Structure of TMSI
Since the TMSI has only local significance (i.e. within the VLR and the area controlled by the VLR), the
structure and coding of it can be chosen by agreement between operator and manufacturer in order to
meet local needs.
The TMSI consists of 4 octets. It can be coded using a full hexadecimal representation.
In order to avoid double allocation of TMSIs after a restart of a VLR, some part of the TMSI may be
related to the time when it was allocated or contain a bit field which is changed when the VLR has
recovered from the restart.
The TMSI shall only be allocated in ciphered form. See also Technical Specification GSM 03.20.
The network shall not allocate a TMSI with all 32 bits equal to 1 (this is because the TMSI must be stored
in the SIM, and the SIM uses 4 octets with all bits equal to 1 for indicating that no valid TMSI is available.

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ijs
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Joined: 24 Oct 2006
Posts: 7

PostPosted: Tue Dec 19, 2006 5:56 pm    Post subject: Reply with quote

TMSI выдается VLR-ом, соответсвенно и уникален в пределах VLR/MSC зоны.
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