?? 5G Standalone (SA) Initial Attach: A Step-by-Step Journey ??
Nitin Gupta
Linkedin Top Voice | 5G 6G | Telecom | AI/ML | Product Marketing I Product Management
Embark on a sequential voyage through the 5G Standalone (SA) initial attach process, where each step is a pivotal move towards establishing a robust connection between the User Equipment (UE) and the Network (NW). Let’s navigate through these steps:
Step 1: Downlink Synchronization
?? Objective: Sync UE with the gNB's timing.
?? Actions:UE performs cell search.
Captures PSS and SSS to identify the cell.
Step 2: Uplink Synchronization
?? Objective: Align UE's transmission timing with gNB.
?? Actions:UE initiates RACH process.
Transmits a randomly chosen preamble.
gNB responds with a timing adjustment.
Step 3: RRC Establishment
?? Objective: Set up a radio resource control connection.
?? Actions:UE sends an RRCSetupRequest message.
gNB responds with RRCSetup, providing configuration info.
Step 4: Registration Request
?? Objective: Register UE with the 5G network.
?? Actions:UE sends a Registration Request to the AMF.
Includes security credentials and network capability.
Step 5: Authentication Process
?? Objective: Verify UE's identity for secure communication.
?? Actions:AMF sends an authentication challenge.
UE responds with a computed authentication response.
Step 6: Security Process
??? Objective: Establish security keys for secure communication.
?? Actions:AMF sends a Security Mode Command.
UE acknowledges with Security Mode Complete message.
Step 7: Registration Accept
? Objective: Finalize UE's registration with the 5G network.
?? Actions:AMF sends Registration Accept with 5G-GUTI and configuration info.
UE is now successfully registered.
Step 8: RRC Reconfiguration
?? Objective: Configure UE for data transmission.
?? Actions:gNB sends RRCReconfiguration with necessary configuration info.
Step 9: PDU Session Establishment Request
?? Objective: Initiate a data session for UE.
?? Actions:UE sends a PDU Session Establishment Request to the SMF.
Request includes data session requirements like SSC Mode, PCO, DNN, etc.
Step 10: PDU Session Establishment Accept
?? Objective: Confirm the establishment of the data session.
?? Actions:SMF sends PDU Session Establishment Accept.
UE is now ready for data transmission over the established PDU session.
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Aspiring Corporate Director / Management Consultant / Corporate Leader
1 å¹´Thanks for inviting, sharing an informative-insightful article. Best wishes to you, Nitin Gupta .