The document lists 12 reasons for triggering random access channel (RACH) procedures in 5G New Radio (NR) networks even when the user equipment (UE) is in RRC_CONNECTED mode. These include initial access from RRC_IDLE, transition from RRC_Inactive to RRC_CONNECTED, handovers, beam failure recovery, timing alignment during Scell addition, and uplink or downlink synchronization issues.

1. https://www.mobileg4u.com/

2. THERE ARE CERTAIN CONDITIONS WHEN UE
NEEDS TO TRIGGER RACH, EVEN WHEN IT’S IN
RRC_CONNECTED MODE.
https://www.mobileg4u.com/

3. NR RACH Trigger Reasons
https://www.mobileg4u.com/
Initial access from RRC_IDLE
Transition from RRC_Inactive to RRC_CONNECTED
RRC Connection Reestablishment
Handover
Beam Failure recovery
Synchronous Reconfiguration
1.
2.
3.
4.
5.
6.

4. NR RACH Trigger Reasons
https://www.mobileg4u.com/
Initial access from RRC_IDLE
Transition from RRC_Inactive to RRC_CONNECTED
RRC Connection Reestablishment
Handover
Beam Failure recovery
Synchronous Reconfiguration
1.
2.
3.
4.
5.
6.

5. NR RACH Trigger Reasons
https://www.mobileg4u.com/
7. Timing alignment during Scell addition
8. DL out of sync- gNB Trigerrs PDCCH order
9. UL Out of sync
10.SR Max Transmission reached
11. UL Data Arrival – No PUCCH Configured for SR
12. On demand System information

6. NR RACH Trigger Reasons
https://www.mobileg4u.com/
7. Timing alignment during Scell addition
8. DL out of sync- gNB Trigerrs PDCCH order
9. UL Out of sync
10.SR Max Transmission reached
11. UL Data Arrival – No PUCCH Configured for SR
12. On demand System information

7. https://www.mobileg4u.com/