5G registration procedure

5G NR
1

here is a call flow for the 5G registration procedure.
Anyone could help to explain what each signaling does?

1.registration request, authentication
1.registration request, authentication1920×1080 170 KB

2.UDM discovery
2.UDM discovery1920×1079 176 KB

3.udm and udr operation
3.udm and udr operation1920×1079 180 KB

4.registration accept and complete
4.registration accept and complete1920×1079 186 KB

5.pdu session establishment
5.pdu session establishment1920×1079 174 KB

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