S-TMSI – Serving Temporary Mobile Subscriber Identity
The S-TMSI is similar in format to the P-TMSI. It is used to protect the subscribers IMSI during NAS interaction as well as identifying the MME (Mobility Management Entity) or MME pool that is responsible for the UE. The S-TMSI is constructed from the MMEC (MME Code) and the M-TMSI.
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