Uplink control data transmission

An interference randomization method in a user equipment (UE) comprising:

• encoding a set of control information bits comprising ACK/NACK bits to generate encoded control information bits;
• scrambling the encoded control information bits to generate scrambled control information bits;
• modulating the scrambled control information bits to generate modulated symbols;
• determining a physical uplink control channel (PUCCH) ACK/NACK resource index;
• determining a first orthogonal sequence index, a second orthogonal sequence index, and a cyclic shift for a demodulation reference signal (DMRS), wherein each of the first orthogonal sequence index, the second orthogonal sequence index, and the cyclic shift is determined based the PUCCH ACK/NACK resource index;
• spreading the modulated symbols block-wise using a first orthogonal sequence indicated by the first orthogonal sequence index and a second orthogonal sequence indicated by the second orthogonal sequence index;
• applying the cyclic shift to the DMRS;
• and
• transmitting the DMRS and the block-wise spread modulated symbols on a PUCCH.