CHANNEL STATE INFORMATION REFERENCE SIGNAL (CSI-RS) CONFIGURATION AND CSI REPORTING RESTRICTIONS

• US 20130258965A1
• Filed: 03/14/2013
• Published: 10/03/2013
• Est. Priority Date: 03/29/2012
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Geirhofer, Stefan, Chen, Wanshi, Gaal, Peter
• Granted Patent: US 9,155,098 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0027 Scheduling of signalling, e.g. occurrence thereof
• CPC Class Codes: H04W 72/51 based on terminal or device properties

Abstract

A method of wireless communication includes determining a capability for a number of channel state information configurations supported by a user equipment (UE). The channel state information processes link a channel measurement report with an interference measurement report. The UE transmits the capability to an eNodeB. Additionally, the UE receives CSI process configurations. The CSI process configurations identify CSI processes that can be requested by the eNodeB.

Claims

1. A method of wireless communication, comprising:

determining a user equipment (UE) capability corresponding to a maximum number of supported channel state information (CSI) processes;

transmitting the UE capability to an eNodeB; and

receiving a plurality of CSI process configurations, the plurality of CSI process configurations identifying a plurality of CSI processes that can be requested by the eNodeB.

2. The method of claim 1, further comprising receiving one or more CSI requests for one or more CSI processes, the one or more CSI requests causing a number of CSI processes within a specific time period to exceed a threshold;

generating at least one outdated CSI report for a specific CSI process based at least in part on outdated CSI for the specific CSI process, the at least one outdated CSI report corresponding to a previously generated CSI report; and

transmitting the at least one outdated CSI report.

3. The method of claim 2, in which the threshold is based at least in part on the UE capability.

4. The method of claim 2, in which:

the plurality of CSI processes identified by the plurality of CSI process configurations are indexed, and

the at least one outdated CSI report is a highest indexed process that exceeds the maximum number of supported CSI processes.

5. The method of claim 4, further comprising

generating at least one CSI report based at least in part on last indicated measurement resources for a lowest indexed CSI processes up to the maximum number of supported CSI processes.

6. The method of claim 2, in which the plurality of CSI processes identified by the plurality of CSI process configurations are aperiodic CSI process requests.

7. The method of claim 1, further comprising:

generating a CSI report based at least in part on a CSI report request; and

transmitting the CSI report.

8. A method of wireless communication, comprising:

receiving a capability for a number of supported channel state information (CSI) configurations; and

transmitting a plurality of CSI process configurations, the plurality of CSI process configurations identifying a plurality of CSI processes that can be requested by an eNodeB.

9. The method of claim 8, further comprising limiting a number of CSI requests transmitted to a user equipment (UE) based at least in part on the received capability.

10. The method of claim 8, further comprising transmitting one or more CSI requests for one or more CSI processes, the one or more CSI requests causing a total number of CSI requests within a specific time period to exceed a threshold;

and

receiving at least one outdated CSI report for a specific CSI process based at least in part on outdated CSI for the specific CSI process, the at least one outdated CSI report corresponding to a previously generated CSI report.

11. The method of claim 10, in which the threshold is based at least in part on the received capability.

12. An apparatus for wireless communications, comprising:

a memory; and

at least one processor coupled to the memory, the at least one processor being configured;

to determine a user equipment (UE) capability corresponding to a maximum number of supported channel state information (CSI) processes;

to transmit the UE capability to an eNodeB; and

to receive a plurality of CSI process configurations, the plurality of CSI process configurations identifying a plurality of CSI processes that can be requested by the eNodeB.

13. The apparatus of claim 12, in which the at least one processor is further configured:

to receive one or more CSI requests for one or more CSI processes, the one or more CSI requests causing a number of CSI processes within a specific time period to exceed a threshold;

to generate at least one outdated CSI report for a specific CSI process based at least in part on outdated CSI for the specific CSI process, the at least one outdated CSI report corresponding to a previously generated CSI report; and

to transmit the at least one outdated CSI report.

14. The apparatus of claim 13, in which the threshold is based at least in part on the UE capability.

15. The apparatus of claim 13, in which:

the plurality of CSI processes identified by the plurality of CSI process configurations are indexed, and

the at least one outdated CSI report is a highest indexed processes that exceeds the maximum number of supported CSI processes.

16. The apparatus of claim 15, in which the at least one processor is further configured to generate at least one CSI report based at least in part on last indicated measurement resources for a lowest indexed CSI processes up to the maximum number of supported CSI processes.

17. The apparatus of claim 13, in which the plurality of CSI processes identified by the plurality of CSI process configurations are aperiodic CSI process requests.

18. The apparatus of claim 12, in which the at least one processor is further configured:

to generate a CSI report based at least in part on a CSI report request; and

to transmit the CSI report.

19. An apparatus for wireless communications, comprising:

a memory; and

at least one processor coupled to the memory, the at least one processor being configured;

to receive a capability for a number of supported channel state information (CSI) configurations; and

to transmit a plurality of CSI process configurations, the plurality of CSI process configurations identifying a plurality of CSI processes that can be requested by an eNodeB.

20. The apparatus of claim 19, in which the at least one processor is further configured to limit a number of CSI requests transmitted to a user equipment (UE) based at least in part on the received capability.

21. The apparatus of claim 19, in which the at least one processor is further configured:

to transmit one or more CSI requests for one or more CSI processes, the one or more CSI requests causing a total number of CSI requests within a specific time period to exceed a threshold; and

to receive at least one outdated CSI report for a specific CSI process based at least in part on outdated CSI for the specific CSI process, the at least one outdated CSI report corresponding to a previously generated CSI report.

22. The apparatus of claim 21, in which the threshold is based at least in part on the received capability.

23. An apparatus for wireless communications, comprising:

means for determining a user equipment (UE) capability corresponding to a maximum number of supported channel state information (CSI) processes;

means for transmitting the UE capability to an eNodeB; and

means for receiving a plurality of CSI process configurations, the plurality of CSI process configurations identifying a plurality of CSI processes that can be requested by the eNodeB.

24. An apparatus for wireless communications, comprising:

means for receiving a capability for a number of supported channel state information (CSI) configurations; and

means for transmitting a plurality of CSI process configurations, the plurality of CSI process configurations identifying a plurality of CSI processes that can be requested by an eNodeB.

25. A computer program product for wireless communications, the computer program product comprising:

a non-transitory computer-readable medium having program code recorded thereon, the program code comprising;

program code to determine a user equipment (UE) capability corresponding to a maximum number of supported channel state information (CSI) processes;

program code to transmit the UE capability to an eNodeB; and

program code to receive a plurality of CSI process configurations, the plurality of CSI process configurations identifying a plurality of CSI processes that can be requested by the eNodeB.

26. A computer program product for wireless communications, the computer program product comprising:

a non-transitory computer-readable medium having program code recorded thereon, the program code comprising;

program code to receive a capability for a number of supported channel state information (CSI) configurations; and

program code to transmit a plurality of CSI process configurations, the plurality of CSI process configurations identifying a plurality of CSI processes that can be requested by an eNodeB.