How 5G UEs Access the Network: RACH Procedures, Preambles & Resource Selection

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Once the UE has obtained the 5G system information, it’s ready to establish the RRC connection with the 5G cell. This is accomplished through the Random Access (RACH) procedure, a process that also existed in LTE.

5G supports both Contention-Based Random Access (CBRA) and Contention-Free Random Access (CFRA). Structurally, CBRA still follows its four steps (MSG1 to MSG4), while CFRA after certain preambles are reserved, works with just two messages (MSG1 and MSG2).

How 5G UEs Access the Network
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