Method and user equipment for transmitting channel state information and method and base station for receiving channel state information

Abstract

The present invention provides a method and a device for transmitting or receiving channel state information (CSI). According to the present invention, when a user equipment can be set with one or more CSI processes per serving cell, a CSI request field included in downlink control information for a specific serving cell indicates at least whether a non-periodic CSI report triggered by the CSI request field is triggered for a set of CSI process(es) set by a higher layer from among the CSI process(es) for the one serving cell.

The invention claimed is:  
     
       1. A method for a user equipment transmitting channel state information (CSI), the method comprising:
 receiving downlink control information for a specific serving carrier, the downlink control information including a CSI request field; and 
 performing an aperiodic CSI report on a physical uplink shared channel (PUSCH) of the specific serving carrier, 
 wherein the aperiodic CSI report is triggered by the CSI request field, and 
 wherein the CSI request field indicates one of ‘no aperiodic CSI report is triggered’, ‘the aperiodic CSI report is triggered for a first set of CSI process(es) configured by a higher layer among CSI process(es) for the specific serving carrier’, ‘the aperiodic CSI report is triggered for a second set of CSI process(es) configured by the higher layer’, and ‘the aperiodic CSI report is triggered for a third set of CSI process(es) configured by the higher layer’, when the user equipment is configured in a mode in which one or more CSI processes can be configured for at least one serving carrier, and 
 wherein each CSI process in the first, second and third sets of CSI processes is associated with a CSI reference resource for signal measurement and an interference measurement resource for interference measurement. 
 
     
     
       2. The method according to  claim 1 , wherein:
 the CSI request field consists of two bits. 
 
     
     
       3. The method according to  claim 1 , wherein:
 the user equipment is configured with one or more serving carriers including the specific serving carrier. 
 
     
     
       4. A method for a base station receiving channel state information (CSI), the method comprising:
 transmitting downlink control information for a specific serving carrier to a user equipment, the downlink control information including a CSI request field; and 
 receiving an aperiodic CSI report on a physical uplink shared channel (PUSCH) of the specific serving carrier, 
 wherein the aperiodic CSI report is triggered by the CSI request field, and 
 wherein the CSI request field indicates one of ‘no aperiodic CSI report is triggered’, ‘the aperiodic CSI report is triggered for a first set of CSI process(es) configured by a higher layer among CSI process(es) for the specific serving carrier’, ‘the aperiodic CSI report is triggered for a second set of CSI process(es) configured by the higher layer’, and ‘the aperiodic CSI report is triggered for a third set of CSI process(es) configured by the higher layer’, when the user equipment is configured in a mode in which one or more CSI processes can be configured for at least one serving carrier, and 
 wherein each CSI process in the first, second and third sets of CSI processes is associated with a CSI reference resource for signal measurement and an interference measurement resource for interference measurement. 
 
     
     
       5. The method according to  claim 4 , wherein:
 the CSI request field consists of two bits. 
 
     
     
       6. The method according to  claim 4 , wherein:
 the user equipment is configured with a plurality of serving carriers including the specific serving carrier. 
 
     
     
       7. A user equipment for transmitting channel state information (CSI), the user equipment comprising:
 a radio frequency (RF) unit; and 
 a processor configured to control the RF unit 
 to: 
 receive downlink control information for a specific serving carrier, the downlink control information including a CSI request field; and 
 is configured to control the RF unit to perform an aperiodic CSI report on a physical uplink shared channel (PUSCH) of the specific serving carrier, 
 wherein the aperiodic CSI report is triggered by the CSI request field, and 
 wherein the CSI request field indicates one of ‘no aperiodic CSI report is triggered’, ‘the aperiodic CSI report is triggered for a first set of CSI process(es) configured by a higher layer among CSI process(es) for the specific serving carrier’, ‘the aperiodic CSI report is triggered for a second set of CSI process(es) configured by the higher layer’, and ‘the aperiodic CSI report is triggered for a third set of CSI process(es) configured by the higher layer’, when the user equipment is configured in a mode in which one or more CSI processes can be configured for at least one serving carrier, and 
 wherein each CSI process in the first, second and third sets of CSI processes is associated with a CSI reference resource for signal measurement and an interference measurement resource for interference measurement. 
 
     
     
       8. The user equipment according to  claim 7 , wherein:
 the CSI request field consists of two bits. 
 
     
     
       9. The user equipment according to  claim 7 , wherein:
 the user equipment is configured with a plurality of serving carriers including the specific serving carrier. 
 
     
     
       10. A base station for receiving channel state information (CSI), the base station comprising:
 a radio frequency (RF) unit; and 
 a processor configured to control the RF unit 
 to: 
 transmit downlink control information for a specific serving carrier to a user equipment, the downlink control information including a CSI request field; and 
 receive an aperiodic CSI report on a physical uplink shared channel (PUSCH) of the specific serving carrier, 
 wherein the aperiodic CSI report is triggered by the CSI request field, and 
 wherein the CSI request field indicates one of ‘no aperiodic CSI report is triggered’, ‘the aperiodic CSI report is triggered for a first set of CSI process(es) configured by a higher layer among CSI process(es) for the specific serving carrier’, ‘the aperiodic CSI report is triggered for a second set of CSI process(es) configured by the higher layer’, and ‘the aperiodic CSI report is triggered for a third set of CSI process(es) configured by the higher layer’, when the user equipment is configured in a mode in which one or more CSI processes can be configured for at least one serving carrier, and 
 wherein each CSI process in the first, second and third sets of CSI processes is associated with a CSI reference resource for signal measurement and an interference measurement resource for interference measurement. 
 
     
     
       11. The base station according to  claim 10 , wherein:
 the CSI request field consists of two bits. 
 
     
     
       12. The user equipment according to  claim 10 , wherein:
 the user equipment is configured with a plurality of serving carriers including the specific serving carrier.