Number of ACK/NACK and number of TB

RAN
1

Hi All,
For HARQ process, i would like to understand below in LTE:

  1. With 4x2 MIMO mode having 2 TB in DL, if UE need to tx NACK then I think there are 2 NACK in uplink.
  2. With 4x2 MIMO with 2 CC CA now there are 4 TB, so UE will tx 4 NACK in uplink in case of error.

Is it correct?

2

I would think so… as many TBs… as many Acks/Nacks.

3

Yes, that’s why PUCCH required capacity increases when we enabled CA.
It further increases when we use 3CC, 4CC CA.

4

Yes PUCCH format 3 used.