In order to send the RRC_RESUME message to gNB, UE needs to perform RACH. In NR the RRC Connection can be put in INACTIVE mode, in this case, UE can resume the connection by triggering the RRC_RESUME message. RACH Applicable to only Stand-Alone mode.įurther Reading: 5G-NR RACH Process Transition from RRC_Inactive to RRC_Connected.2-Step RACH in Release-16 is applicable in this scenario.The Initial RACH will always be contention-based rach as gNB will not have any prior information related to UE. When UE decodes MIB/SIB1 of a favorable cell it attempts to perform RACH on that cell. This is pretty self-explanatory, When UE powers ON, it needs to find a cell and camp on it to receive wireless services.
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