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5G NR UE Initial Access Process

prodevelopertutorial September 10, 2022

5G NR UE initial access process

In this chapter we shall learn about 5G NR initial access process in brief.

1. UE sends RRC connection request message to gNB-DU.

2. gNB-DU will assign a C-RNTI to the UE and will include corresponding low level configuration for UE, will be included in F1AP INITIAL UL RRC MESSAGE TRANSFER message.

3. gNB-CU assigns F1AP ID to UE and generates RRC CONNECTION SETUP messages to UE. This will be encapsulated in F1AP DL RRC MESSAGE TRANSFER message.

4. gNB-DU sends RRC CONNECTION SETUP message to UE.

5. UE sends RRC CONNECTION SETUP COMPLETE message to gNB-DU.

6. gNB-DU encapsulates RRC messages in F1AP UL RRC MESSAGE TRANSFER messages and sends them to gNB-CU.

7. gNB-CU sends the INITIAL UE MESSAGE message to AMF.

8. AMF sends the initial UE context creation request message to gNB-CU.

9. gNB-CU sends a UE context creation request message to establish a UE context in gNB-DU. RRC SECURITY MODE COMMAND message will be encapsulated inside this.

10. gNB-DU sends RRC SECURITY MODE COMMAND message to UE.

11. gNB-DU sends the UE CONTEXT SETUP RESPONSE message to gNB-CU.

12. UE sends RRC SECURITY MODE COMPLETE message.

13. gNB-DU encapsulates RRC messages in F1AP UL RRC MESSAGE TRANSFER message and sends them to gNB-CU.

14. gNB-CU generates RRC CONNECTION RECONFIGURATION message and encapsulates them in F1AP DL RRC MESSAGE TRANSFER message

15. gNB-DU sends RRC CONNECTION RECONFIGURATION message to UE.

16. UE sends RRC CONNECTION RECONFIGURATION COMPLETE message to gNB-DU.

17. gNB-DU encapsulates RRC messages in F1AP UL RRC MESSAGE TRANSFER messages and sends them to gNB-CU.

18. gNB-CU sends INITIAL UE CONTEXT SETUP RESPONSE message to AMF.

 

3GPP TS 38.331: “NR; Radio Resource Control (RRC) protocol specification”;

3GPP TS 38.413: “NG-RAN; NG Application Protocol (NGAP)”;

3GPP TS 38.473: “NG-RAN; F1 application protocol (F1AP)”;

 

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