Method and apparatus for transmitting reference signal in mobile communication system
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method by which a terminal receives a signal in a mobile communication system, according to one embodiment of the present specification, comprises the steps of: receiving channel state information-reference signal (CSI-RS) mode information; and receiving a signal on the basis of the CSI-RS mode information. Unlike a conventional method of allowing a base station to periodically set the CSI-RS in a terminal at a predetermined position such that the terminal receives the CSI-RS and generates and reports channel state information, the present invention proposes a method by which a base station allocates, to a terminal, a reference signal transmission for enabling aperiodic generation of the channel state information for a system having various numbers of transmission antenna ports such as one, two, four, eight, twelve, sixteen or thirty-two transmission antenna ports, and receives the channel state information report. In addition, a method for transferring ZP CSI-RS and quasi co-location (QCL) information for supporting rate matching thereby is also proposed.
1. A method performed by a terminal in a mobile communication system, the method comprising:
receiving, from a base station, information on a type of a plurality of channel state information-reference signal (CSI-RS) resources, the type of the plurality of the CSI-RS resources including an aperiodic type and a semi-persistent type;
receiving, from the base station, a medium access control (MAC) control element (CE) indicating at least one of the plurality of the CSI-RS resources; and
receiving, from the base station, a CSI-RS based on the CSI-RS resources indicated by the MAC CE.
2. The method of claim 1 , wherein, in case the type of the plurality of the CSI-RS corresponds to the aperiodic type, the method further comprising:
receiving, from the base station, downlink control information (DCI) indicating at least one of the CSI-RS resources indicated by the MAC CE; and
receiving, from the base station, the CSI-RS on the CSI-RS resources indicated by the DCI.
3. The method of claim 1 , wherein, in case the type of the plurality of the CSI-RS corresponds to the semi-persistent type, the method further comprising:
receiving, from the base station, the CSI-RS periodically on the CSI-RS resources indicated by the MAC CE.
4. The method of claim 1 , further comprising:
receiving, from the base station, information associated with a quasi co-location (QCL) relationship between a demodulation reference signal (DMRS) for a physical downlink shared channel (PDSCH) and the CSI-RS; and
receiving, from the base station, the PDSCH based on the information associated with the QCL relationship,
wherein the DMRS of the PDSCH is quasi co-located with the CSI-RS with respect to Doppler shift, Doppler spread, average delay and delay spread.
5. A method performed by a base station in a mobile communication system, the method comprising:
transmitting, to a terminal, information on a type of a plurality of channel state information-reference signal (CSI-RS) resources, the type of the plurality of the CSI-RS resources including an aperiodic type and a semi-persistent type;
transmitting, to the terminal, a medium access control (MAC) control element (CE) indicating at least one of the plurality of the CSI-RS resources; and
transmitting, to the terminal, a CSI-RS based on the CSI-RS resources indicated by the MAC CE.
6. The method of claim 5 , wherein, in case the type of the plurality of the CSI-RS corresponds to the aperiodic type, the method further comprising:
transmitting, to the terminal, downlink control information (DCI) indicating at least one of the CSI-RS resources indicated by the MAC CE; and
transmitting, to the terminal, the CSI-RS on the CSI-RS resources indicated by the DCI.
7. The method of claim 5 , wherein, in case the type of the plurality of the CSI-RS corresponds to the semi-persistent type, the method further comprising:
transmitting, to the terminal, the CSI-RS periodically on the CSI-RS resources indicated by the MAC CE.
8. The method of claim 5 , further comprising:
transmitting, to the terminal, information associated with a quasi co-location (QCL) relationship between a demodulation reference signal (DMRS) for a physical downlink shared channel (PDSCH) and the CSI-RS; and
transmitting, to the terminal, the PDSCH based on the information associated with the QCL relationship,
wherein the DMRS of the PDSCH is quasi co-located with the CSI-RS with respect to Doppler shift, Doppler spread, average delay and delay spread.
9. A terminal in a mobile communication system, comprising:
a transceiver configured to transmit and receive a signal; and
a controller operatively connected with the transceiver and configured to:
receive, from a base station, information on a type of a plurality of channel state information-reference signal (CSI-RS) resources, the type of the plurality of the CSI-RS resources including an aperiodic type and a semi-persistent type,
receive, from the base station, a medium access control (MAC) control element (CE) indicating at least one of the plurality of the CSI-RS resources, and
receive, from the base station, a CSI-RS based on the CSI-RS resources indicated by the MAC CE.
10. The terminal of claim 9 , wherein, in case the type of the plurality of the CSI-RS corresponds to the aperiodic type, the controller is further configured to:
receive, from the base station, downlink control information (DCI) indicating at least one of the CSI-RS resources indicated by the MAC CE, and
receive, from the base station, the CSI-RS on the CSI-RS resources indicated by the DCI.
11. The terminal of claim 9 , wherein, in case the type of the plurality of the CSI-RS corresponds to the semi-persistent type, the controller is further configured to:
receive, from the base station, the CSI-RS periodically on the CSI-RS resources indicated by the MAC CE.
12. The terminal of claim 9 , wherein the controller is further configured to:
receive, from the base station, information associated with a quasi co-location (QCL) relationship between a demodulation reference signal (DMRS) for a physical downlink shared channel (PDSCH) and the CSI-RS, and
receive, from the base station, the PDSCH based on the information associated with the QCL relationship,
wherein the DMRS of the PDSCH is quasi co-located with the CSI-RS with respect to Doppler shift, Doppler spread, average delay and delay spread.
13. A base station in a mobile communication system, comprising:
a transceiver configured to transmit and receive a signal; and
a controller operatively connected with the transceiver and configured to:
transmit, to a terminal, information on a type of a plurality of channel state information-reference signal (CSI-RS) resources, the type of the plurality of the CSI-RS resources including an aperiodic type and a semi-persistent type,
transmit, to the terminal, a medium access control (MAC) control element (CE) indicating at least one of the plurality of the CSI-RS resources, and
transmit, to the terminal, a CSI-RS based on the CSI-RS resources indicated by the MAC CE.
14. The base station of claim 13 , wherein, in case the type of the plurality of the CSI-RS corresponds to the aperiodic type, the controller is further configured to:
transmit, to the terminal, downlink control information (DCI) indicating at least one of the CSI-RS resources indicated by the MAC CE, and
transmit, to the terminal, the CSI-RS on the CSI-RS resources indicated by the DCI.
15. The base station of claim 13 , wherein, in case the type of the plurality of the CSI-RS corresponds to the semi-persistent type, the controller is further configured to:
transmit, to the terminal, the CSI-RS periodically on the CSI-RS resources indicated by the MAC CE.
16. The base station of claim 13 , wherein the controller is further configured to:
transmit, to the terminal, information associated with a quasi co-location (QCL) relationship between a demodulation reference signal (DMRS) for a physical downlink shared channel (PDSCH) and the CSI-RS, and
transmit, to the terminal, the PDSCH based on the information associated with the QCL relationship,
wherein the DMRS of the PDSCH is quasi co-located with the CSI-RS with respect to Doppler shift, Doppler spread, average delay and delay spread.