Method and apparatus for transmitting and receiving feedback information in mobile communication system using multiple antennas
A method and an apparatus for transmitting/receiving feedback in a mobile communication system are provided. A method of configuring and receiving feedback information of an evolved Node B (eNB) includes transmitting configuration information on a plurality of reference signals including a first reference signal and a second reference signal to a User Equipment (UE); transmitting feedback configuration information including first feedback configuration information on the first reference signal and second feedback configuration information configured such that feedback information on the second reference signal is generated with reference to the first feedback configuration information to the UE; transmitting the reference signal to the UE according to the configuration information on the reference signal; and receiving feedback information including first feedback information according to the first feedback configuration information and second feedback information according to the second feedback configuration information from the UE.
1. A method in a mobile communication system, the method comprising:
transmitting a configuration message including report mode information, a first channel status indication reference signal (CSI-RS) resource configuration, and a second CSI-RS resource configuration; and
receiving a feedback message including a channel quality indicator (CQI),
wherein a rank indicator and a precoding matrix indicator are included in the feedback message based on the report mode information,
wherein the CQI is generated using both of the first CSI-RS resource configuration and the second CSI-RS resource configuration in case that the configuration message includes a type of multiple input multiple output (MIMO), and
wherein a number of antenna ports associated with the CQI is determined based on a number of antenna ports associated with the first CSI-RS resource configuration and a number of antenna ports associated with the second CSI-RS resource configuration.
2. The method of claim 1 , wherein the precoding matrix indicator is determined based on codebook information associated with the type of MIMO included in the configuration message.
3. The method of claim 2 , wherein the precoding matrix indicator is selected within precoding matrices defined by the codebook information.
4. A method in a mobile communication system, the method comprising:
receiving a configuration message including report mode information, a first channel status indication reference signal (CSI-RS) resource configuration, and a second CSI-RS resource configuration; and
transmitting a feedback message including a channel quality indicator (CQI),
wherein a rank indicator and a precoding matrix indicator are included in the feedback message based on the report mode information,
wherein the CQI is generated using both of the first CSI-RS resource configuration and the second CSI-RS resource configuration in case that the configuration message includes a type of multiple input multiple output (MIMO), and
wherein a number of antenna ports associated with the CQI is determined based on a number of antenna ports associated with the first CSI-RS resource configuration and a number of antenna ports associated with the second CSI-RS resource configuration.
5. The method of claim 4 , wherein the precoding matrix indicator is determined based on codebook information associated with the type of MIMO included in the configuration message.
6. The method of claim 5 , wherein the precoding matrix indicator is selected within precoding matrices defined by the codebook information.
7. An evolved Node B (eNB) in a mobile communication system, the eNB comprising:
a transceiver for transmitting and receiving signals; and
a controller configured to:
transmit a configuration message including report mode information, a first channel status indication reference signal (CSI-RS) resource configuration and a second CSI-RS resource configuration, and
receive a feedback message including a channel quality indicator (CQI),
wherein a rank indicator and a precoding matrix indicator are included in the feedback message based on the report mode information,
wherein the CQI is generated using both of the first CSI-RS resource configuration and the second CSI-RS resource configuration in case that the configuration message includes a type of multiple input multiple output (MIMO), and
wherein a number of antenna ports associated with the CQI is determined based on a number of antenna ports associated with the first CSI-RS resource configuration and a number of antenna ports associated with the second CSI-RS resource configuration.
8. The eNB of claim 7 , wherein the precoding matrix indicator is determined based on codebook information associated with the type of MIMO included in the configuration message.
9. The eNB of claim 8 , wherein the precoding matrix indicator is selected within precoding matrices defined by the codebook information.
10. A user equipment (UE) in a mobile communication system, the UE comprising:
a transceiver for transmitting and receiving signals; and
a controller configured:
receive a configuration message including report mode information, a first channel status indication reference signal (CSI-RS) resource configuration and a second CSI-RS resource configuration, and
transmit a feedback message including a channel quality indicator (CQI),
wherein a rank indicator and a precoding matrix indicator are included in the feedback message based on the report mode information,
wherein the CQI is generated using both of a first CSI-RS resource configuration and the second CSI-RS resource configuration in case that the configuration message includes a type of multiple input multiple output (MIMO), and
wherein a number of antenna ports associated with the CQI is determined based on a number of antenna ports associated with the first CSI-RS resource configuration and a number of antenna ports associated with the second CSI-RS resource configuration.
11. The UE of claim 10 , wherein the precoding matrix indicator is determined based on codebook information associated with the type of MIMO included in the configuration message.
12. The UE of claim 11 , wherein the precoding matrix indicator is selected within precoding matrices defined by the codebook information.