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TMSIs are managed by the
MSC/VLR.

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Posted by HamidAliKhan

To track a GSM user via the TMSI, an eavesdropper must intercept the GSM. network communication where the TMSI is initially negotiated.

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Posted by waqasahmad

In the GSM system, TMSIs are managed by the
MSC/VLR.

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Posted by sagitraz

Temporary Mobile Subscriber Identity(TMSI) helps in identifies subscriber, it is periodically changed by the system managment to protect the subscriber.
Basically VLR control TMSI
TMSI will be updated in any following situation:
Call setup
On entry to new LAI
On entry to new VLR

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Posted by Hash007