Self-organizing network control for PUCCH resources

Patent metadata

Field	Value
Publication number	US-9154283-B2
Application number	US-200913145214-A
Country	US
Kind code	B2
Filing date	Jan 21, 2009
Priority date	Jan 21, 2009
Publication date	Oct 6, 2015
Grant date	Oct 6, 2015

Abstract

Automatically adjust the size of a Physical Uplink Control Channel, PUCCH, of an uplink communication subframe. In a particular embodiment, the size of a semi-static region of the PUCCH is adjusted. The adjustment is based on a utilization factor of the PUCCH over a time period. The adjustment can also be based on the connection factor (connections between the wireless terminals and the cell) and/or based on the utilization factor of a PUSCH (Physical Uplink Shared Channel). The result is an efficient resource utilization on the PUCCH, and a properly dimensioned PUCCH region.

First claim

What is claimed is:

1. A method to schedule a physical uplink control channel (PUCCH) of a cell in a wireless network for one or more wireless terminals, comprising:
determining, over a time period, a shared uplink resource utilization including any one or more of a PUCCH utilization factor for a semi-static uplink control information (UCI) component of a semi-static PUCCH region, a connection factor of the cell, and a physical uplink shared channel (PUSCH) utilization factor of the cell;
determining whether the semi-static PUCCH region should be adjusted based on the determined shared uplink resource utilization; and
adjusting the semi-static PUCCH region when it is determined that the semi-static PUCCH region should be adjusted;
wherein determining the PUCCH utilization factor for the semi-static UCI component comprises:
determining a UCI component ratio of the semi-static UCI component for each of a plurality of uplink subframes over the time period; and
determining the PUCCH utilization factor based on a distribution of the UCI component ratios over the time period, wherein the UCI component ratio is a ratio of an amount of semi-static PUCCH resources allocated for the semi-static UCI component relative to an entire amount of the semi-static PUCCH resources available in one uplink subframe.

2. The method of claim 1 , wherein the time period is one of one or more specified time periods, and at least one of the specified time periods repeats in a pattern.

3. The method of claim 1 wherein the adjusted semi-static PUCCH region is applied to a future time period.

4. The method of claim 1 , wherein in the step of adjusting the semi-static PUCCH region, an operation profile of the cell is updated with information related to an adjustment to the semi-static PUCCH region, the cell's operation profile being used to initially set a configuration of the semi-static PUCCH region of the cell for the time period.

5. The method of claim 1 , wherein the semi-static UCI components include a channel quality indication, a scheduling request, a precoding matrix indicator, a rank indication, and a semi-static ACK/NACK.

6. The method of claim 1 , wherein the PUCCH utilization factor is determined to be an average, a median, a sliding average, a mode, or a range of the distribution of the UCI component ratios.

7. The method of claim 1 , wherein in the plurality of the uplink subframes is a subset, less than all, of the uplink subframes of the time period.

8. The method of claim 1 , wherein the step of determining whether the semi-static PUCCH region should be adjusted comprises:
determining that the semi-static PUCCH region should be increased when the PUCCH utilization factor is above an upper bound of a target PUCCH range for the semi-static UCI component; and
determining that the semi-static PUCCH region should be decreased when the PUCCH utilization factor is below a lower bound of the target PUCCH range for the semi-static UCI component.

9. The method of claim 8 , wherein each semi-static UCI component has a corresponding target PUCCH range that is valid for the time period.

10. The method of claim 8 , wherein target parameters include the target PUCCH range, the target connection range, and the target PUSCH range, the method further comprising:
determining that one or more target parameters should be adjusted; and
adjusting the one or more target parameters when it is determined that the one or more target parameters should be adjusted, wherein the step of determining that the one or more target parameters should be adjusted comprises any one or more of:
determining that the target PUCCH range should be adjusted when the PUCCH utilization factor is not within the target PUCCH range, determining that the target connection range should be adjusted when the connection factor is not within the target connection range, and determining that the target PUSCH range should be adjusted when the PUSCH utilization factor is not within the target PUSCH range.

11. The method of claim 10 , wherein the adjusted one or more target parameters are applied to a future time period.

12. A scheduler of a cell in a wireless network to provide scheduling services to one or more wireless terminals in the network including scheduling a PUCCH of the cell, comprising:
a utilization determining processor configured to determine, over a time period, a shared uplink resource utilization including any one or more of a PUCCH utilization factor for a semi-static UCI component of a semi-static PUCCH region, a connection factor of the cell, and a PUSCH utilization factor of the cell; and
a PUCCH adjusting processor configured to determine whether the semi-static PUCCH region should be adjusted based on the determined shared uplink resource utilization, and to adjust the semi-static PUCCH region when it so determines;
the utilization determining processor further configured to:
determine a UCI component ratio of the semi-static UCI component for each of a plurality of uplink subframes over the time period; and
determine the PUCCH utilization factor based on a distribution of the UCI component ratios over the time period, wherein the UCI component ratio is a ratio of an amount of semi-static PUCCH resources allocated for the semi-static UCI component relative to an entire amount of the semi-static PUCCH resources available in one uplink subframe.

13. The scheduler of claim 12 , wherein the time period is one of one or more specified time periods in which at least one of the specified time periods repeats in a pattern.

14. The scheduler of claim 12 , further comprising a processor configured to:
apply the adjusted semi-static PUCCH region to a future time period;
set an initial configuration of the semi-static PUCCH region of the cell for the time period based on a cell's operation profile; and
update the operation profile of the cell with information related to an adjustment to the semi-static PUCCH region.

15. The scheduler of claim 12 , wherein the utilization determining to determine the PUCCH utilization factor as an average, a median, a sliding average, a mode, or a range of the distribution of the UCI component ratios.

16. The scheduler of claim 12 , wherein in the plurality of the uplink subframes is a subset, less than all, of the uplink subframes of the time period.

17. The scheduler of claim 12 , wherein the PUCCH adjusting processor is configured to determine that the semi-static PUCCH region should be increased or decreased, respectively, when the PUCCH utilization factor is above an upper bound or below a lower bound of a target PUCCH range for the semi-static UCI component, and wherein each semi-static UCI component has a corresponding target PUCCH range that is valid for the time period.

18. The scheduler of claim 17 , wherein target parameters include the target PUCCH range, the target connection range, and the target PUSCH range, and wherein the processing unit is arranged to determine whether one or more target parameters should be adjusted and to adjust the one or more target parameters when it so determines, apply the adjusted one or more target parameters to the future time period, and update the operation profile of the cell within a storage unit with information related to the adjusted one or more target parameters.

19. A base station in a wireless network to provide scheduling services to one or more wireless terminals in the network including scheduling a PUCCH of a cell corresponding to a service coverage area provided by the base station, the bas

Assignees

• Johansson Anders
• Faronius Carola
• Hedlund Leo
• Östergaard Jessica
• Moberg Peter
• Ericsson Telefon Ab L M

Inventors

• Johansson Anders
• Faronius Carola
• Hedlund Leo
• Östergaard Jessica
• Moberg Peter

Classifications

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04W72/20

  Control channels or signalling for resource management · CPC title

• H04W72/52

  based on load · CPC title

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W72/1278

  Electricity · mapped topic