关于36213协议中7.3 UE procedure for reporting ACK/NACK中的Nbundled是干啥用的？

为啥 if the UE detects that at least one downlink assignment has been missed and the UE shall generate NACK for all codewords where is determined by the UE as . If the UE does not detect any downlink assignment missing, is determined by the UE as . UE shall not transmit ACK/NACK if and

用于决定UCI中ACK的扰码序列的选择，请参见36.212 5.2.2.6的下面一段话：

A scrambling sequence [w0_ack, w1_ack, w2_ack, w3_ack]is then selected from Table 5.2.2.6-A with index  i = (Nbundled -1 )mod 4, where Nbundled is determined as described in section 7.3 of [3].