Hi Jesse,

> The TMSI gets changed when the phone performs a location update right?

Right.

> Does the phone update the TMSI when changing cells or changing location
areas?

When it changes location areas or it may also perform a periodic location
update. On my phone the periodic location update interval is no more than
1530 minutes, but it may be less (e.g. I saw 234 minutes)

> In the latter case, what is the chance of a phone changes its TMSI in a
large shopping centre?

The location area may be as big as a city, but the phone may still send a
periodic location update, which I expect to happen in half of all cases in
general.

Vadim.


2010/11/24 Jesse Wang <[email protected]>

> Hi guys
>
> The TMSI gets changed when the phone performs a location update right? Does
> the phone update the TMSI when changing cells or changing location areas? In
> the latter case, what is the chance of a phone changes its TMSI in a large
> shopping centre? Isn't extremly unlikely, as a shopping centre would
> probably be covered by only 1 location area?
>
> Regards,
>
> Jesse Wang
>
>
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