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NR gNB ULSCH fixes

Francesco Mani requested to merge NR_gNB_ULSCH_fixes into develop

While testing UE MSG3 re-transmissions I got into a couple of bugs in OAI gNB

  • When no signal is declared for MSG3, the gNB would abort RA instead of asking the UE to re-transmit MSG3
  • When returning with a failure before decoding, the gNB would wrongly mark the payload as ACKed because there is no check on the success of the decoding (there is a wrong comment saying we can assume a good TB). Not sure if the fix I propose is the correct one but it seems to work.

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