Method and apparatus for transmitting and receiving reference signal in wireless communication system
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) are provided. The 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. Disclosed are a method and an apparatus for configuring, transmitting, and receiving a reference signal in a wireless communication system.
1. A method performed by a terminal in a wireless communication system, the method comprising:
receiving, from a base station, a first tracking reference signal (TRS) for time and frequency tracking;
performing a bandwidth change or a beam change;
identifying whether a condition for receiving a TRS for a changed bandwidth or a changed beam is satisfied or not; and
receiving, from the base station, a second TRS for the changed bandwidth or the changed beam, in case that the condition is satisfied,
wherein the condition is identified to be satisfied based on a difference between a last TRS reception time before the bandwidth change or the beam change and a first TRS reception time after the bandwidth change or the beam change.
2. The method of claim 1 , wherein the condition is identified to be satisfied, in case that a first difference between the last TRS reception time before the bandwidth change and the first TRS reception time after the bandwidth change is greater than a first threshold value, or in case that a second difference between the last TRS reception time before the beam change and the first TRS reception time after the beam change is greater than a second threshold value.
3. The method of claim 1 , wherein the second TRS includes an aperiodic TRS (A-TRS) to be triggered by first downlink control information (DCI) for changing a bandwidth part (BWP) or an A-TRS to be triggered by second DCI for requesting channel state information (CSI) subsequent to the first DCI.
4. The method of claim 1 , wherein the second TRS includes a semi persistent TRS (SP-TRS) activated by a medium access control (MAC) control component (CE) for activating a secondary cell (SCell) or an aperiodic TRS (A-TRS) to be triggered by downlink control information (DCI) for requesting channel state information (CSI) subsequent to the MAC CE.
5. The method of claim 1 , wherein a tracking in the changed bandwidth or the changed beam is performed based on the first TRS, in case that the condition is not satisfied.
6. A method performed by a base station in a wireless communication system, the method comprising:
transmitting, to a terminal, a first tracking reference signal (TRS) for time and frequency tracking;
performing a bandwidth change or a beam change for the terminal;
identifying whether a condition for transmitting a TRS for a changed bandwidth or a change beam is satisfied or not; and
transmitting, to the terminal, a second TRS for the changed bandwidth or the changed beam, in case that the condition is satisfied,
wherein the condition is identified to be satisfied based on a difference between a last TRS reception time before the bandwidth change or the beam change and a first TRS reception time after the bandwidth change or the beam change.
7. The method of claim 6 , wherein the condition is identified to be satisfied, in case that a first difference between the last TRS reception time before the bandwidth change and the first TRS reception time after the bandwidth change is greater than a first threshold value, or in case that a second difference between the last TRS reception time before the beam change and the first TRS reception time after the beam change is greater than a second threshold value.
8. The method of claim 6 , wherein the second TRS includes an aperiodic TRS (A-TRS) to be triggered by first downlink control information (DCI) for changing a bandwidth part (BWP) or an A-TRS to be triggered by second DCI for requesting channel state information (CSI) subsequent to the first DCI.
9. The method of claim 6 , wherein the second TRS includes a semi persistent TRS (SP-TRS) activated by a medium access control (MAC) control component (CE) for activating a secondary cell (SCell) or an aperiodic TRS (A-TRS) to be triggered by downlink control information (DCI) for requesting channel state information (CSI) subsequent to the MAC CE.
10. The method of claim 6 , wherein a tracking in the changed bandwidth or the changed beam is performed based on the first TRS, in case that the condition is not satisfied.
11. A terminal in a wireless communication system, the terminal comprising:
a transceiver configured to transmit and receive a signal; and
a controller configured to:
receive, from a base station, a first tracking reference signal (TRS) for time and frequency tracking,
perform a bandwidth change or a beam change,
identify whether a condition for receiving a TRS in a changed bandwidth or a changed beam is satisfied or not, and
receive, from the base station, a second TRS for the changed bandwidth or the changed beam, in case that the condition is satisfied,
wherein the condition is identified to be satisfied based on a difference between a last TRS reception time before the bandwidth change or the beam change and a first TRS reception time after the bandwidth change or the beam change.
12. The terminal of claim 11 , wherein the condition is identified to be satisfied, in case that a first difference between the last TRS reception time before the bandwidth change and the first TRS reception time after the bandwidth change is greater than a first threshold value, or in case that a second difference between the last TRS reception time before the beam change and the first TRS reception time after the beam change is greater than a second threshold value.
13. The terminal of claim 11 , wherein the second TRS includes an aperiodic TRS (A-TRS) to be triggered by first downlink control information (DCI) for changing a bandwidth part (BWP) or an A-TRS to be triggered by second DCI for requesting channel state information (CSI) subsequent to the first DCI.
14. The terminal of claim 11 , wherein the second TRS includes a semi persistent TRS (SP-TRS) activated by a medium access control (MAC) control component (CE) for activating a secondary cell (SCell) or an aperiodic TRS (A-TRS) to be triggered by downlink control information (DCI) for requesting channel state information (CSI) subsequent to the MAC CE.
15. The terminal of claim 11 , wherein a tracking in the changed bandwidth or the changed beam is performed based on the first TRS, in case that the condition is not satisfied.
16. A base station 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, a first tracking reference signal (TRS) for time and frequency tracking,
perform a bandwidth change or a beam change for the terminal,
identify whether a condition for transmitting a TRS for a changed bandwidth or a changed beam is satisfied or not, and
transmit, to the terminal, a second TRS for the changed bandwidth or the changed beam, in case that the condition is satisfied,
wherein the condition is identified to be satisfied based on a difference between a last TRS reception time before the bandwidth change or the beam change and a first TRS reception time after the bandwidth change or the beam change.
17. The base station of claim 16 , wherein the condition is identified to be satisfied, in case that a first difference between the last TRS reception time before the bandwidth change and the first TRS reception time after the bandwidth change is greater than a first threshold value, or in case that a second difference between the last TRS reception time before the beam change and the first TRS reception time after the beam change is greater than a second threshold value.
18. The base station of claim 16 , wherein the second TRS includes an aperiodic TRS (A-TRS) to be triggered by first downlink control information (DCI) for changing a bandwidth part (BWP) or an A-TRS to be triggered by second DCI for requesting channel state information (CSI) subsequent to the first DCI.
19. The base station of claim 16 , wherein the second TRS includes a semi persistent TRS (SP-TRS) activated by a medium access control (MAC) control component (CE) activating a secondary cell (SCell) or an aperiodic TRS (A-TRS) to be triggered by downlink control information (DCI) for requesting channel state information (CSI) subsequent to the MAC CE.
20. The base station of claim 16 , wherein a tracking in the changed bandwidth or the changed beam is performed based on the first TRS, in case that the condition is not satisfied.