Method and apparatus for channel state information reference signal (CSI-RS)
Methods and apparatuses for CSI reporting mechanisms are provided. A user equipment (UE) includes a transceiver and a processor operably connected to the transceiver. The transceiver is configured to receive information indicating a channel state information reference signal (CSI-RS) resource configuration, uplink-related downlink control information (DCI), and a CSI-RS associated with a selected CSI-RS resource in a same subframe as the uplink-related DCI. The processor configured to determine, in response to a CSI request included in the uplink-related DCI, an aperiodic CSI in reference to the CSI-RS. The transceiver is further configured to report the aperiodic CSI by transmitting the aperiodic CSI on an uplink channel.
1. A method of transmitting channel state information (CSI) by a terminal in a wireless communication system, the method comprising:
receiving, from a base station, first information for configuring at least one CSI reference signal (CSI-RS) resource set;
receiving, from the base station, second information for activating a CSI-RS resource set from the at least one CSI-RS resource set;
calculating a CSI parameter based on a CSI-RS corresponding to the activated CSI-RS resource set; and
transmitting, to the base station, the CSI based on the calculated CSI parameter,
wherein the second information is included in a medium access control (MAC) control element (CE), and
wherein a starting time for a transmission of the CSI-RS is determined based on the second information.
2. The method of claim 1 , further comprising:
receiving, from the base station, third information deactivating the activated CSI-RS resource set, the third information included in a MAC CE.
3. The method of claim 2 , wherein an ending time for the transmission of the CSI-RS is determined based on the third information.
4. The method of claim 3 , wherein a message including the first information further comprises fourth information on a periodicity and an offset for a CSI-RS resource in the at least one CSI-RS resource set.
5. A terminal of transmitting channel state information (CSI) in a wireless communication system, the terminal comprising:
a transceiver configured to transmit and receive signals; and
a controller configured to:
receive, from a base station, first information for configuring at least one CSI reference signal (CSI-RS) resource set,
receive, from the base station, second information for activating a CSI-RS resource set from the at least one CSI-RS resource set,
calculating a CSI parameter based on a CSI-RS corresponding to the activated CSI-RS resource set,
transmit, to the base station, the CSI based on the calculated CSI parameter,
wherein the second information is included in a medium access control (MAC) control element (CE), and
wherein a starting time for a transmission of the CSI-RS is determined based on the second information.
6. The terminal of claim 5 , wherein the controller is further configured to receive, from the base station, third information deactivating the activated CSI-RS resource set, the third information included in a MAC CE.
7. The terminal of claim 6 , wherein an ending time for the transmission of the CSI-RS is determined based on the third information.
8. The terminal of claim 7 , wherein a message including the first information further comprises fourth information on a periodicity and an offset for a CSI-RS resource in the at least one CSI-RS resource set.
9. A method of receiving channel state information (CSI) by a base station in a wireless communication system, the method comprising:
transmitting, to a terminal, first information for configuring at least one CSI reference signal (CSI-RS) resource set;
transmitting, to the terminal, second information for activating a CSI-RS resource set from the at least one CSI-RS resource set; and
receiving, from the terminal, a CSI calculated based on a CSI-RS corresponding to the activated CSI-RS resource set,
wherein the second information is included in a medium access control (MAC) control element (CE), and
wherein a starting time for a transmission of the CSI-RS is determined based on the second information.
10. The method of claim 9 , further comprising:
transmitting, to the terminal, third information deactivating the activated CSI-RS resource set, the third information being included in a MAC CE.
11. The method of claim 10 , wherein an ending time for the transmission of the CSI-RS is determined based on the third information, and
wherein a message including the first information further comprises fourth information on a periodicity and an offset for a CSI-RS resource in the at least one CSI-RS resource set.
12. A base station of receiving channel state information (CSI) in a wireless communication system, the base station comprising:
a transceiver configured to transmit and receive a signal; and
a controller configured to:
transmit, to a terminal, first information for configuring at least one CSI reference signal (CSI-RS) resource set,
transmit, to the terminal, second information for activating a CSI-RS resource set from the at least one CSI-RS resource set, and
receive, from the terminal, a CSI calculated based on a CSI-RS corresponding to the activated CSI-RS resource set,
wherein the second information is included in a medium access control (MAC) control element (CE), and
wherein a starting time for a transmission of the CSI-RS is determined based on the second information.
13. The base station of claim 12 , wherein the controller is further configured to transmit, to the terminal, third information deactivating the activated CSI-RS resource set, the third information included in a MAC CE.
14. The base station of claim 13 , wherein an ending time for the transmission of the CSI-RS is determined based on the third information.
15. The base station of claim 14 , wherein a message including the first information further comprises fourth information on a periodicity and an offset for a CSI-RS resource in the at least one CSI-RS resource set.