Channel state measurement and reporting

Abstract

A method for reporting uplink control information (UCI) on a user equipment (UE) is described. A Type 2 channel state information (CSI) report is generated for a CSI reference resource. The Type 2 CSI report is sent to a base station. The Type 2 CSI report is computed from a channel measurement based on a non-zero power reference signal on a single subframe within a configured CSI-RS resource associated with a CSI process.

What is claimed is:  
     
       1. A method for receiving uplink control information (UCI), comprising:
 receiving a first channel state information (CSI) report for a CSI reference resource from a user equipment (UE) if triggered; and 
 receiving a second CSI report for the CSI reference resource from the UE if triggered, 
 wherein the second CSI report is computed from a channel measurement based on only a non-zero power CSI reference signal only on a single subframe within a configured CSI reference signal resource associated with a CSI process, wherein the first CSI report is computed from a channel measurement based on only non-zero power CSI reference signals within a configured CSI reference signal resource associated with a CSI process based on an unrestricted observation interval in time and frequency, wherein the single subframe is a subframe of the CSI reference resource, and the CSI reference resource for the second CSI report reported in uplink subframe n is defined by a valid downlink subframe n-k. 
 
     
     
       2. The method of  claim 1 , wherein the valid downlink subframe is in a set of subframes for a channel measurement for the Type 2 CSI report. 
     
     
       3. The method of  claim 1 , wherein the valid downlink subframe is in a set of subframes in which the non-zero power CSI reference signal is configured. 
     
     
       4. The method of  claim 1 , wherein the valid downlink subframe is in a set of subframes for Type 2 channel measurement if the set of subframes for Type 2 channel measurement is configured, and wherein the valid downlink subframe is in a set of subframes in which the non-zero power CSI reference signal is configured if the set of subframes for Type 2 channel measurement is not configured. 
     
     
       5. The method of  claim 1 , wherein the Type 2 CSI report is a periodic CSI report. 
     
     
       6. The method of  claim 5 , wherein Type 2 CSI reporting is configured in a CSI process configuration. 
     
     
       7. The method of  claim 1 , wherein the Type 2 CSI report is an aperiodic CSI report. 
     
     
       8. The method of  claim 7 , wherein a field in a downlink control information (DCI) specifies whether Type 2 aperiodic CSI reporting is triggered. 
     
     
       9. The method of  claim 1 , wherein the Type 2 CSI report corresponds to a configured CSI process. 
     
     
       10. A method for reporting uplink control information (UCI), comprising:
 transmitting a first channel state information (CSI) report for a CSI reference resource from a user equipment (UE) if triggered; and 
 transmitting a second CSI report for the CSI reference resource if triggered, 
 wherein the second CSI report is computed from a channel measurement based on only a non-zero power CSI reference signal only on a single subframe within a configured CSI reference signal resource associated with a CSI process, wherein the first CSI report is computed from a channel measurement based on only non-zero power CSI reference signals within a configured CSI reference signal resource associated with a CSI process based on an unrestricted observation interval in time and frequency, wherein the single subframe is a subframe of the CSI reference resource, and the CSI reference resource for the second CSI report reported in uplink subframe n is defined by a valid downlink subframe n-k. 
 
     
     
       11. The method of  claim 10 , wherein the valid downlink subframe is in a set of subframes for a channel measurement for the Type 2 CSI report. 
     
     
       12. The method of  claim 10 , wherein the valid downlink subframe is in a set of subframes in which the non-zero power CSI reference signal is configured. 
     
     
       13. The method of  claim 10 , wherein the valid downlink subframe is in a set of subframes for Type 2 channel measurement if the set of subframes for Type 2 channel measurement is configured, and wherein the valid downlink subframe is in a set of subframes in which the non-zero power CSI reference signal is configured if the set of subframes for Type 2 channel measurement is not configured. 
     
     
       14. The method of  claim 10 , wherein the Type 2 CSI report is a periodic CSI report. 
     
     
       15. The method of  claim 14 , wherein Type 2 CSI reporting is configured in a CSI process configuration. 
     
     
       16. The method of  claim 10 , wherein the Type 2 CSI report is an aperiodic CSI report. 
     
     
       17. The method of  claim 16 , wherein a field in a downlink control information (DCI) specifies whether Type 2 aperiodic CSI reporting is triggered. 
     
     
       18. The method of  claim 10 , wherein the Type 2 CSI report corresponds to a configured CSI process. 
     
     
       19. A base station configured for receiving uplink control information (UCI), comprising:
 a processor; 
 memory in electronic communication with the processor; and 
 instructions stored in the memory, the instructions being executable to:
 receive a first channel state information (CSI) report for a CSI reference resource from a user equipment (UE) if triggered; and 
 receive a second CSI report for the CSI reference resource from the UE if triggered, 
 wherein the second CSI report is computed from a channel measurement based on only a non-zero power CSI reference signal only on a single subframe within a configured CSI reference signal resource associated with a CSI process, wherein the first CSI report is computed from a channel measurement based on only non-zero power CSI reference signals within a configured CSI reference signal resource associated with a CSI process based on an unrestricted observation interval in time and frequency, wherein the single subframe is a subframe of the CSI reference resource, and the CSI reference resource for the second CSI report reported in uplink subframe n is defined by a valid downlink subframe n-k. 
 
 
     
     
       20. The base station of  claim 19 , wherein the valid downlink subframe is in a set of subframes for a channel measurement for the Type 2 CSI report. 
     
     
       21. The base station of  claim 19 , wherein the valid downlink subframe is in a set of subframes in which the non-zero power CSI reference signal is configured. 
     
     
       22. The base station of  claim 19 , wherein the valid downlink subframe is in a set of subframes for Type 2 channel measurement if the set of subframes for Type 2 channel measurement is configured, and wherein the valid downlink subframe is in a set of subframes in which the non-zero power CSI reference signal is configured if the set of subframes for Type 2 channel measurement is not configured. 
     
     
       23. The base station of  claim 19 , wherein the Type 2 CSI report is a periodic CSI report. 
     
     
       24. The base station of  claim 23 , wherein Type 2 CSI reporting is configured in a CSI process configuration. 
     
     
       25. The base station of  claim 19 , wherein the Type 2 CSI report is an aperiodic CSI report. 
     
     
       26. The base station of  claim 25 , wherein a field in a downlink control information (DCI) specifies whether Type 2 aperiodic CSI reporting is triggered. 
     
     
       27. The base station of  claim 23 , wherein the Type 2 CSI report corresponds to a configured CSI process. 
     
     
       28. A user equipment (UE) configured for reporting uplink control information (UCI), comprising:
 a processor; 
 memory in electronic communication with the processor; and 
 instructions stored in the memory, the instructions being executable to:
 transmit a first channel state information (CSI) report for a CSI reference resource from a user equipment (UE) if triggered; and 
 transmit a second CSI report for the CSI reference resource if triggered, 
 wherein the second CSI report is computed from a channel measurement based on only a non-zero power CSI reference signal only on a single subframe within a configured CSI reference signal resource associated with a CSI process, wherein the first CSI report is computed from a channel measurement based on only non-zero power CSI reference signals within a configured CSI reference signal resource associated with a CSI process based on an unrestricted observation interval in time and frequency, wherein the single subframe is a subframe of the CSI reference resource, and the CSI reference resource for the second CSI report reported in uplink subframe n is defined by a valid downlink subframe n-k. 
 
 
     
     
       29. The UE of  claim 28 , wherein the valid downlink subframe is in a set of subframes for a channel measurement for the Type 2 CSI report. 
     
     
       30. The UE of  claim 28 , wherein the valid downlink subframe is in a set of subframes in which the non-zero power CSI reference signal is configured. 
     
     
       31. The UE of  claim 28 , wherein the valid downlink subframe is in a set of subframes for Type 2 channel measurement if the set of subframes for Type 2 channel measurement is configured, and wherein the valid downlink subframe is in a set of subframes in which the non-zero power CSI reference signal is configured if the set of subframes for Type 2 channel measurement is not configured. 
     
     
       32. The UE of  claim 28 , wherein the Type 2 CSI report is a periodic CSI report. 
     
     
       33. The UE of  claim 32 , wherein Type 2 CSI reporting is configured in a CSI process configuration. 
     
     
       34. The UE of  claim 28 , wherein the Type 2 CSI report is an aperiodic CSI report. 
     
     
       35. The UE of  claim 34 , wherein a field in a downlink control information (DCI) specifies whether Type 2 aperiodic CSI reporting is triggered. 
     
     
       36. The UE of  claim 28 , wherein the Type 2 CSI report corresponds to a configured CSI process. 
     
     
       37. The UE of  claim 1 , wherein a downlink subframe is determined to be valid based, in part, on whether it is a multimedia broadcast/multicast service single-frequency network (MBSFN) frame.