Channel rank updates in multiple-input multiple-output communication systems
View Patent ↗Embodiments of the disclosure provide a system and method for providing channel feedback information (CFI) from a user equipment device to a base station. CFI is transmitted from the user equipment device on first and second communication channels. The user equipment device is operable to measure the channel rank of a downlink channel and to select a preferred channel rank that is used to configure the CFI that is transmitted to the base station. The base station is operable to use the preferred channel rank to interpret the CFI transmitted by the user end device.
1. A method for processing signals in a communication system comprising a base station and one or more user equipment devices, the method comprising:
receiving a first set of channel feedback information (CFI), including a first rank report, from a user equipment device on a first communication channel;
receiving a second set of CFI, including a second rank report, from said user equipment device on a second communication channel; and
wherein, during a reporting time interval, said first and second rank reports are independent and said first rank report is used to interpret CFI data transmitted on the first communication channel and said second rank report is used to interpret CFI transmitted on the second communication channel.
2. A method for processing signals in a communication system comprising a base station and one or more user equipment devices, the method comprising:
receiving a first set of channel feedback information (CFI), according to a first scheduling mode, including a first rank report, from a user equipment device on a first communication channel;
receiving a second set of CFI, according to a second scheduling mode, including a second rank report, from said user equipment device on a second communication channel; and
wherein, during a reporting time interval, said first and second rank reports are independent and said first rank report is used to interpret CFI data transmitted on the first communication channel and said second rank report is used to interpret CFI transmitted on the second communication channel.
3. A method for processing signals in a communication system comprising a base station and one or more user equipment devices, the method comprising:
receiving a first set of channel feedback information (CFI), comprising a frequency selective CFI of a first type, including a first rank report, from a user equipment device on a first communication channel;
receiving a second set of CFI, comprising a frequency-selective CFI of a second type, including a second rank report, from said user equipment device on a second communication channel; and
wherein, during a reporting time interval, said first and second rank reports are independent and said first rank report is used to interpret CFI data transmitted on the first communication channel and said second rank report is used to interpret CFI transmitted on the second communication channel.
4. The method of claim 1 , wherein the first channel comprises a physical uplink control channel (PUCCH), and the second channel comprises a physical uplink shared channel (PUSCH).
5. The method of claim 4 , wherein the first and second sets of CFI comprise frequency-selective reports.
6. The method of claim 4 , wherein the first and second sets of CFI comprise wideband reports.
7. The method of claim 4 , wherein the first set of CFI comprises a wideband report, and the second set of CFI comprises a frequency-selective report.
8. The method of claim 7 , wherein the base station schedules a downlink control resource based at least in part on the first set of CFI.
9. The method of claim 7 , wherein the base station schedules a downlink data resource based at least in part on the second set of CFI.
10. The method of claim 4 , wherein the first set of CFI comprises a periodic report, and the second set of CFI comprises an aperiodic report.
11. The method of claim 1 , wherein:
the first set of CFI is processed based at least in part on the first rank report; and
the second set of CFI is processed based at least in part on the second rank report.
12. The method of claim 1 , wherein the base station specifies a CFI reporting mode.
13. The method of claim 2 , wherein the first channel comprises a physical uplink control channel (PUCCH) and the second channel comprises a physical uplink shared channel (PUSCH).
14. The method of claim 13 , wherein the first set of CFI comprises a periodic report, and the second set of CFI comprises an aperiodic report.
15. The method of claim 14 , wherein:
the first set of CFI is processed based at least in part on the first rank report; and
the second set of CFI is processed based at least in part on the second rank report.
16. The method of claim 3 , wherein the first channel comprises a physical uplink control channel (PUCCH) and the second channel comprises a physical uplink shared channel (PUSCH); and
wherein the first set of CFI comprises a periodic report and the second set of CFI comprises an aperiodic report.
17. A user equipment device comprising:
a channel feedback report generator operable to generate a first set of measured channel feedback information (CFI), including a first measured rank, and a second set of measured CFI, including a second measured rank;
processing logic operable to use the first measured rank process a first CFI report and the second measured rank to process a second CFI report; and
transmission circuitry operable to transmit the first CFI report on a first communication channel, and to transmit the second CFI report on a second communication channel;
wherein the first and second measured rank are independent of each other.
18. The user equipment device of claim 17 , wherein the first channel comprises a physical uplink control channel (PUCCH) and the second channel comprises a physical uplink shared channel (PUSCH).
19. The user equipment device of claim 18 , wherein the first set of CFI comprises a wideband report and the second set of CFI comprises an frequency-selective report.
20. The user equipment device of claim 18 , wherein the first and second sets of CFI comprise wideband reports.
21. The user equipment device of claim 18 , wherein the first set of CFI comprises a periodic report and the second set of CFI comprises an aperiodic report.
22. A user equipment device comprising:
a feedback report generator comprising:
measurement circuitry to determine a first group of channel feedback information (CFI) report including a first measured rank, and determine a second group of CFI including a second measured rank;
report processing logic configured to
process the first group of CFI based at least in part on the first measured rank to produce a first CFI report; and
process the second group of CFI based at least in part on the second measured rank to produce a second CFI report; and
transmission circuitry operable to transmit the first CFI report on a first communication channel, and to transmit the second CFI report on a second communication channel;
wherein the second measured rank is invalid for interpretation of the first CFI report.
23. The user equipment device of claim 22 , wherein the first channel comprises a physical uplink control channel (PUCCH), and the second channel comprises a physical uplink shared channel (PUSCH).
24. The user equipment device of claim 23 , wherein the first CFI report comprises a periodic report, and the second CFI report comprises an aperiodic report.
25. The user equipment device of claim 22 , wherein a base station schedules a downlink control resource based at least in part on the first CFI report.
26. A base station apparatus comprising:
transmission circuitry operable to:
receive a first set of channel feedback information (CFI), including a first rank report, from a user equipment device on a first communication channel;
receive a second set of CFI, including a second rank report, from the user equipment device on a second communication channel; and
wherein the first and second rank reports are independent, and the first rank report is used to interpret CFI data transmitted on the first communication channel, and the second rank report is used to interpret CFI transmitted on the second communication channel.
27. The base station apparatus of claim 26 , wherein the first channel comprises a physical uplink control channel (PUCCH), and the second channel comprises a physical uplink shared channel (PUSCH).
28. The base station apparatus of claim 27 , wherein the first set of CFI comprise a periodic report, and the second set of CFI comprise an aperiodic report.
29. The base station apparatus of claim 27 , wherein the base station schedules a downlink control resource based at least in part on the first set of CFI.
30. The base station apparatus of claim 27 , wherein the base station schedules a downlink data resource based at least in part on the second set of CFI.
31. The base station apparatus of claim 26 , wherein the base station specifies a CFI reporting mode.