Method and apparatus for transmitting and receiving channel state information in a wireless communication system
A method and apparatus for transmitting and receiving CSI is provided for use in a wireless communication system using a plurality of antennas. The CSI transmission method of a terminal includes receiving a first CSI-RS and a second CSI-RS, transmitting a CSI indicator indicating one of the first and second CSI-RS corresponding to CSI to be transmitted, and transmitting the CSI generated based on the CSI indicator, until transmission of a new CSI indicator.
1. A channel state information (CSI) transmission method of a terminal, the method comprising:
receiving a first CSI reference signal (CSI-RS) and a second CSI-RS;
transmitting a CSI indicator at a first timing, wherein the CSI indicator indicates one CSI-RS among the first CSI-RS and the second CSI-RS; and
reporting a channel quality indicator (CQI) at a second timing which is different than the first timing, the CQI being generated based on the one CSI-RS indicated by the transmitted CSI indicator,
wherein a reporting period of the CSI indicator is an integer multiple of at least one among a period of the CQI and a period of a precoding matrix indicator (PMI) generated based on the one CSI-RS indicated by the transmitted CSI indicator.
2. The method of claim 1 , wherein the CSI indicator is transmitted with a rank indicator.
3. The method of claim 1 , wherein the CQI is reported until transmission of a new CSI indicator.
4. The method of claim 1 , wherein the first and second CSI-RSs are transmitted by a two-dimensional antenna array.
5. The method of claim 4 , wherein the CSI indicator is a dimension indicator indicating one of first dimension-grouped antenna ports and second dimension-grouped antenna ports.
6. The method of claim 5 , wherein the dimension indicator indicates which one of the first dimension grouped antenna ports and the second dimension grouped antenna ports correspond to the PMI.
7. A terminal for transmitting channel state information (CSI), the terminal comprising:
a receiver;
a transmitter; and
a controller configured to:
control the receiver to receive a first CSI reference signal (CSI-RS) and a second CSI-RS,
control the transmitter to transmit a CSI indicator at a first timing, wherein the CSI indicator indicates one CSI-RS among the first CSI-RS and the second CSI-RS, and
control the transmitter to report a channel quality indicator (CQI) at a second timing which is different than the first timing, the CQI being generated based on the one CSI-RS indicated by the transmitted CSI indicator,
wherein a reporting period of the CSI indicator is an integer multiple of at least one among a period of the CQI and a period of a precoding matrix indicator (PMI) generated based on the one CSI-RS indicated by the transmitted CSI indicator.
8. The terminal of claim 7 , wherein the CSI indicator is transmitted with a rank indicator.
9. The terminal of claim 7 , wherein the CQI is reported until transmission of a new CSI indicator.
10. A channel state information (CSI) reception method of a base station (BS), the method comprising:
transmitting a first CSI reference signal (CSI-RS) and a second CSI-RS;
receiving a CSI indicator at a first timing, wherein the CSI indicator indicates one CSI-RS among the first CSI-RS and the second CSI-RS; and
receiving a channel quality indicator (CQI) at a second timing which is different than the first timing, the CQI being generated based on the one CSI-RS indicated by the received CSI indicator,
wherein a reporting period of the CSI indicator is an integer multiple of at least one among a period of the CQI and a period of a precoding matrix indicator (PMI) generated based on the one CSI-RS indicated by the transmitted CSI indicator.
11. The method of claim 10 , wherein the CSI indicator is received with a rank indicator.
12. The method of claim 10 , wherein the CQI is received until receipt of a new CSI indicator.
13. A base station (BS) for receiving channel state information (CSI), the BS comprising:
a transmitter;
a receiver; and
a controller configured to:
control the transmitter to transmit a first CSI reference signal (CSI-RS) and a second CSI-RS,
control the receiver to receive a CSI indicator at a first timing, wherein the CSI indicator indicates one CSI-RS among the first CSI-RS and the second CSI-RS, and
control the receiver to receive a channel quality indicator (CQI) at a second timing which is different than the first timing, the CQI being generated based on the one CSI-RS indicated by the received CSI indicator,
wherein a reporting period of the CSI indicator is an integer multiple of at least one among a period of the CQI and a period of a precoding matrix indicator (PMI) generated based on the one CSI-RS indicated by the transmitted CSI indicator.
14. The BS of claim 13 , wherein the CSI indicator is received with a rank indicator.
15. The BS of claim 13 , wherein the CQI is received until receipt of a new CSI indicator.