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Baseband behavior on IMSI change » History » Revision 2
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neels, 02/25/2020 07:13 PM
Baseband behavior on IMSI change¶
| phone | chipset | behavior scheme | directly when writing new IMSI to SIM file | on CM Service Request | after periodical LU period | after flight mode / phone restart |
| Nokia | (I) | no reaction | uses previous TMSI | uses previous TMSI | uses previous TMSI; on Identity Request returns new IMSI |
(I) Keeps TMSI¶
Even though the IMSI has changed, the Baseband remains actively attached.
On contact with the core network, it uses the last TMSI, and hence looks as if it remained completely unchanged, keeps using the previous identity.
After a power cycle, it also uses the last TMSI.
When the MSC has forgotten the last TMSI (e.g. due to IMSI Detach), the Identity Request is answered with the new IMSI, and the phone has thus switched to the new identity.
Needs:
- make the MSC forget the TMSI
- trigger baseband activity to cause a re-attach with the new IMSI
Updated by neels about 4 years ago · 2 revisions
