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Fix Msg4 false feedback in UE

Sakthivel Velumani requested to merge msg4-feedback-fix into develop

Issue

If the msg4 feedback is lost, the UE doesn't send feedback for retransmissions of msg4 and the gNB reaches max harq retransmissions. Hence, the UE thinks it is connected while the RA has failed at the gNB. The reason is that after successful reception of msg4, the UE goes into connected state and stops monitoring the random access search space. So the subsequent DCIs for msg4 retransmissions are not received.

Fix

After successful decoding of msg4, the UE continues to monitor the random access search space for some time.

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