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Overview about 4G S-TMSI and 5G S-TMSI

Mohamed ELAdawi

Oct 18, 2024 — 1 min read

What are 4G S-TMSI and 5G S-TMSI?

4G S-TMSI, and is part of GUTI, it is used to identify a UE within a specific MME Pool.
5G S-TMSI can be used to identify a UE within a specific AMF Region.

How can you trace and check them?

In 4G: It is included in RRCSetupRequest, Paging, and Initial UE Message. Where 4G S-TMSI is a combination of MME Code + M-TMSI.
In 5G: It is included in RRCSetupRequest, Paging, Registration request, and Initial UE Message. Where 5G S-TMSI is a combination of AMF Set Pointer, AMF Pointer + 5G-TMSI.

Also, in the realm of signaling analysis and optimization work, when might you need this data, and what are its use cases?

In network troubleshooting, if a degradation is linked to a specific user, promptly gather TMSI information from live traces.
Communicate this data to the Core team, enabling them to provide the corresponding IMSI for continued troubleshooting.

Refer to the below YouTube video for more details:

Source: 5G NR in Bullets

Session 3: 5G NSA Mobility: E2E Call Flows & Troubleshooting - Materials

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