Method and device for measuring interference in a wireless communication system
The present invention relates to a method and device for measuring interference in a wireless communication system. User equipment (UE) receives interference measuring indicators form a base station and measures interference based on the interference-measuring indicators by using all or some resource elements (RE) that correspond to zero-power channel state information (CSI) reference signal (RS) configurations.
1. A method for measuring interference in a wireless communication system, the method comprising:
receiving, by a first user equipment (UE), an interference measurement indicator from a base station, wherein the interference measurement indicator indicates antenna ports transmitting a non-zero-power channel state information (CSI) reference signal (RS) of a second UE colliding with a zero-power CSI RS of the first UE;
determining, by the first UE, resource elements (REs) corresponding to the antenna ports based on the interference measurement indicator, wherein the REs corresponding to the antenna ports is included in REs corresponding to the zero-power CSI RS of the first UE; and
measuring, by the first UE, interference by using the REs corresponding to the antenna ports.
2. The method of claim 1 , further comprising:
receiving, by the first UE from the base station, allocation information for antenna ports transmitting the zero-power CSI RS of the first UE.
3. The method of claim 1 , wherein the number of the antenna ports is two or four.
4. The method of claim 1 , wherein the interference is measured only based on the REs corresponding to the antenna ports.
5. The method of claim 1 , wherein the interference measurement indicator indicates one of antenna ports { 15 , 16 }, antenna ports { 17 , 18 }, or antenna ports { 15 , 16 , 17 , 18 }.
6. The method of claim 1 , wherein the interference measurement indicator indicates one of antenna ports { 15 , 16 }, and one of antenna ports { 17 , 18 }.
7. The method of claim 1 , wherein the interference measurement indicator is one bit or two bits.
8. The method of claim 1 , wherein the interference measurement indicator is received through a CSI-RS-Config information element (IE) transmitted through a higher layer.
9. The method of claim 1 , further comprising:
transmitting, by the first UE, the measured interference to the base station.
10. A user equipment (UE) for measuring interference in a wireless communication system, the UE comprising:
a radio frequency (RF) unit for transmitting or receiving a radio signal; and
a processor connected to the RF unit, and configured to:
receive an interference measurement indicator from a base station, wherein the interference measurement indicator indicates antenna ports transmitting a non-zero-power channel state information (CSI) reference signal (RS) of other UEs colliding with a zero-power CSI RS of the UE;
determine resource elements (REs) corresponding to the antenna ports based on the interference measurement indicator, wherein the REs corresponding to the antenna ports is included in REs corresponding to the zero-power CSI RS of the first UE; and
measure interference by using the REs corresponding to the antenna ports.
11. The UE of claim 10 , wherein the processor is further configured to:
receive, from the base station, allocation information for antenna ports transmitting the zero-power CSI RS of the UE.
12. The UE of claim 10 , wherein the number of the antenna ports is two or four.
13. The UE of claim 10 , wherein the interference is measured only based on the REs corresponding to the antenna ports.
14. The UE of claim 10 , wherein the interference measurement indicator is one bit or two bits.
15. The UE of claim 10 , wherein the interference measurement indicator is received through a CSI-RS-Config information element (IE) transmitted through a higher layer.