How UE decides whether the 2nd Pusch after cfra RACH is a retx or a new tx?

Hi All,

Does anyone know how UE decides whether the 2nd Pusch after cfra RACH is a retx or a new tx?

1st Pusch is based on grant from RAR… so no associated NDI bit here.

Check this:

https://www.sciencedirect.com/topics/engineering/retransmission

Seems to have several different articles…

Is there anything specific to msg3 retx here thay you might have seen?