Method and apparatus for multiplexing channel state information

A base station (BS), comprising:

• a processor configured to generate configuration information for channel state information (CSI) reporting;
• and
• a transceiver operably connected to the processor, the transceiver configured to:
• transmit, to a user equipment (UE), the configuration information via a downlink (DL) channel, and
• receive, from the UE a CSI calculated in accordance with the configuration information on an uplink (UL) channel,
• wherein the CSI includes separately encoded N segments, and is received in one slot,
• wherein N is two,
• wherein a first of the two segments includes a rank indicator (RI), and a channel quality indicator (CQI) for a first codeword (CW), and
• wherein, in case that the RI reported in the first segment is greater than four, a second of the two segments contains a precoding matrix indicator (PMI) and CQI relating to a second CW, and
• wherein, in case that the RI reported in the first segment is equal to or less than four, the second of the two segments contains the PMI without the CQI relating to the second CW.

A method for operating a user equipment (UE), the method comprising:

• receiving and decoding configuration information for channel state information (CSI) reporting;
• decoding the configuration information;
• calculating a CSI according to the configuration information;
• and
• transmitting the calculated CSI on an uplink (UL) channel,
• wherein the CSI includes N segments and is transmitted in one slot,
• wherein N is two,
• wherein a first of the two segments includes a rank indicator (RI) and a channel quality indicator (CQI) for a first codeword (CW), and
• wherein, in case that the RI reported in the first segment is greater than four, a second of the two segments contains a precoding matrix indicator (PMI) and CQI relating to a second CW,
• wherein, in case that the RI reported in the first segment is equal to or less than four, the second of the two segments contains the PMI without the CQI relating to the second CW, and
• wherein the first segment and the second segment are separately encoded.