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5G NR SA Registration/Attach Call Flow

A 5G Stand Alone also know as Option 2, architecture includes 5G UE, gNB and 5G Core Network. In this post we will discuss about 5G SA Registration Call Flow for OTA messages (b/w UE and gNB) and NGAP messages (b/w gNB and 5GC AMF ). In 5G SA mode term Registration is equal to Attach in 4G LTE.

At high level, 5G SA Registration call flow includes following Steps and shown in following figure:


F1AP Signaling for UE Registration

NGAP Signaling for UE Registration


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