Does UE attempt the Contention based RACh during the Handover?

Question

weather it is RRCConnection request or direct NAS message as ULInfotransfer?

Answer 1

Answer is No

Answer 2

Non-contention based procedure is always initiated from network in case of a handover. For this procedure, the eNB reserves a set of preamble sequence.This entire procedure is controlled by the eNB. Hence. no question of collision.

Answer 3

Yes contention based is possible in below scenario:
If target ENb didn't give preambles to do hand over rach , then UE has to do contention based rach on target ENB.