what is RLF in what all sceanrios it triggered and how can we debug it?

Question

Can someone explain this step by step?

Answer 1

Radio Link Failure :When UE is in Connected mode then only UE will have Radio Link.Basically the Radio link is between UE and eNB entities only.

Radio Link Failure Causes:1.)PDCCH Block Error Rate(BLER) is >10% is Observed at PHY.
2.)RRC Connection Reconfiguration Failure (To Setup/Release Measurements,To Establish/Modify/Release of Bearers)
3.)RRC Connection Reconfiguration Failure (Handover Failure)
4.)Max RACH Preamble Transmission Reached.
5.)Max RLC Retransmissions Reached.
6.)PDCP Integrity Check Failure.
7.)Uplink Time Alignment Timer Expiry(Lost Uplink Synchronization).

Answer 2

Radio Link Failure:When UE is in Connected mode we have a Radio Link between UE and e-NodeB and the Radio Link is Existing between UE and eNodeB only.

Radio Link Failure Causes: 1.)PDCCH Block Error Rate (BLER) is> 10% is Observed at PHY.
2.)RRC Connectio Reconfiguration Failure(To Setup/Release Measurements,To Setup/Modify/Release Bearers).
3.)RRC Connection Reconfiguration Failure(Handover Failure).
4.) Max RACH Preamble Transmission reached.
5.)Max RLC Retransmission reached(RLC Unrecoverable error).
6.)PDCP Integrity check Failure.
7.)Uplink Time alignment Timer Expiry.