What are different PUCCH formats and PUCCH Mixed Mode in LTE? We should know what all PUCCH formats are available in LTE or LTE-A, before exploring PUCCH Mixed Mode. Basically PUCCH formats are of two types Format 1 and Format 2 (Format 3 is introduced in LTE advance release 10, which uses modulation scheme QPSK and number of bits used as 48 per subframe). PUCCH Format 1 (Rel 8): Format Type Control Information Modulation Scheme No. of bits / Subframe 1 SR (Scheduling Request) Not Applicable Not Applicable 1a HARQ ACK/NACK BPSK 1 bit 1b HARQ ACK/NACK (for MIMO) QPSK 2 bits PUCCH Format 2: Format Type Control Information Modulation Scheme No. of bits / Subframe 2 CSI (Channel State Info.) QPSK 20 bits 2a CSI+HARQ ACK/NACK QPSK+BPSK 21 bits 2b CSI+HARQ ACK/NACK (for MIMO) QPSK + B...
