Common rate control command generation

• US 20060045013A1
• Filed: 08/27/2004
• Published: 03/02/2006
• Est. Priority Date: 08/27/2004
• Status: Active Grant

• Current Assignee: Unwired Planet LLC (JP Morgan Chase & Co)
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Vannithamby, Rath, Chen, Wanshi
• Granted Patent: US 7,668,085 B2
• Time in Patent Office: Days
• US Class Current: 370/231
• CPC Class Codes: H04W 28/22 Negotiating communication rate

Abstract

A method of Common Rate Control (CRC) command generation considers status bits returned by mobile stations subject to CRC. The status bits from each mobile station, e.g., the Mobile station Status Indication Bits (MSIBs) defined by Release D of the IS-2000 standards, indicate whether the mobile station is capable of increasing its reverse link data rate, and may additionally indicate whether the mobile station has enough data for transmission to warrant a higher rate. Regardless, the status bits indicate how many in a group of mobile stations are capable of increasing their reverse link rates. Thus, a base station'"'"'s command generation logic can take advantage of the additional knowledge gained from the status bits when generating CRC commands.

Claims

1. A method of reverse link rate control at a base station comprising:

receiving status bits from mobile stations in a group of mobile stations subject to common rate control, said status bits from each mobile station indicating whether the mobile station can increase its reverse link data rate; and

selectively generating common rate control commands for the group of mobile stations based on evaluating the status bits.

2. The method of claim 1, wherein selectively generating common rate control commands for the group of mobile stations based on evaluating the status bits comprises generating the common rate control commands based on the status bits if a reverse link loading at the base station is high, and otherwise generating the common rate control commands based on the reverse link loading irrespective of the status bits.

3. The method of claim 1, wherein selectively generating common rate control commands for the group of mobile stations based on evaluating the status bits comprises generating the common rate control commands based on the status bits if the number of mobile stations in the group is below a defined count, and otherwise generating the common rate control commands based on a reverse link loading at the base station irrespective of the status bits.

4. The method of claim 1, wherein selectively generating common rate control commands for the group of mobile stations based on evaluating the status bits comprises generating the common rate control commands based on the status bits if a reverse link loading at the base station is high and if the number of mobile stations in the group is below a defined count, and otherwise generating the common rate control commands based on the reverse link loading irrespective of the status bits.

5. The method of claim 1, wherein selectively generating common rate control commands for the group of mobile stations based on evaluating the status bits comprises, during conditions wherein a reverse link loading at the base station would otherwise prevent the generation of up commands, generating one or more up commands for the group if the status bits indicate that only one or a few of the mobile stations in the group can increase their reverse link data rates.

6. The method of claim 1, wherein selectively generating common rate control commands for the group of mobile stations based on evaluating the status bits comprises determining the particular common rate control commands to be sent to the group based on identifying from the status bits how many mobile stations in the group can increase their reverse link data rates.

7. The method of claim 1, wherein selectively generating common rate control commands for the group of mobile stations based on evaluating the status bits comprises generating the common rate control commands based on one or more probability functions, and adjusting one or more of the one or more probability functions based on the status bits.

8. The method of claim 7, wherein adjusting one or more of the one or more probability functions based on the status bits comprises setting one or more probabilities for generating a particular value of the common rate control commands based on identifying from the status bits how many mobile stations in the group can increase their reverse link data rates.

9. The method of claim 1, wherein selectively generating common rate control commands for the group of mobile stations based on evaluating the status bits comprises generating particular values of the common rate control commands based on comparing a reverse link loading at the base station to one or more defined loading thresholds, and adjusting one or more of the defined loading thresholds based on the status bits.

10. The method of claim 9, wherein adjusting one or more of the defined loading thresholds based on the status bits comprises changing the value of one or more of the defined loading thresholds based on identifying from the status bits how many of the mobile stations in the group can increase their reverse link data rates.

11. A base station system comprising one or more rate control processors configured to generate common rate control commands for a group of mobile stations:

process status bits from mobile stations in a group of mobile stations subject to common rate control, said status bits from each mobile station indicating whether the mobile station can increase its reverse link data rate; and

selectively generate common rate control commands for the group of mobile stations based on evaluating the status bits.

12. The base station system of claim 11, wherein the one or more rate control processors are configured to generate the common rate control commands based on the status bits if a reverse link loading at the base station is high, and otherwise generate the common rate control commands based on the reverse link loading irrespective of the status bits.

13. The base station system of claim 11, wherein the one or more rate control processors are configured to generate the common rate control commands based on the status bits if the number of mobile stations in the group is below a defined count, and otherwise generate the common rate control commands based on a reverse link loading at the base station irrespective of the status bits.

14. The base station system of claim 11, wherein the one or more rate control processors are configured to generate the common rate control commands based on the status bits if a reverse link loading at the base station is high and if the number of mobile stations in the group is below a defined count, and otherwise generate the common rate control commands based on the reverse link loading irrespective of the status bits.

15. The base station system of claim 11, wherein the one or more rate control processors are configured, during conditions wherein a reverse link loading at the base station would otherwise prevent the generation of up commands, to generate one or more up commands for the group if the status bits indicate that only one or a few of the mobile stations in the group can increase their reverse link data rates.

16. The base station system of claim 11, wherein the one or more rate control processors are configured to determine the particular common rate control commands to be sent to the group based on identifying from the status bits how many mobile stations in the group can increase their reverse link data rates.

17. The base station system of claim 11, wherein the one or more rate control processors are configured to generate the common rate control commands based on one or more probability functions, and to adjust one or more of the one or more probability functions based on the status bits.

18. The base station system of claim 17, wherein the one or more rate control processors are configured to set one or more probabilities for generating a particular value of the common rate control commands based on identifying from the status bits how many mobile stations in the group can increase their reverse link data rates.

19. The base station system of claim 11, wherein the one or more rate control processors are configured to generate particular values of the common rate control commands based on comparing a reverse link loading at the base station to one or more defined loading thresholds, and to adjust one or more of the defined loading thresholds based on the status bits.

20. The base station system of claim 19, wherein the one or more rate control processors are configured to change the value of one or more of the defined loading thresholds based on identifying from the status bits how many of the mobile stations in the group can increase their reverse link data rates.

21. A method of generating common rate control commands at a base station for one or more groups of mobile stations comprising selectively operating in first and second modes, wherein:

in the first mode of operation, generating common rate control commands for the one or more groups of mobile stations is based at least in part on status bits received from each mobile station that indicate whether the reverse link rate of the mobile station can be increased; and

in the second mode of operation, generating common rate control commands for the one or more groups is not based on the status bits.

22. The method of claim 21, further comprising determining whether to operate in the first mode or in the second mode based on evaluating a reverse link loading condition at the base station.

23. The method of claim 22, wherein determining whether to operate in the first mode or in the second mode based on evaluating a reverse link loading condition at the base station comprises choosing the first mode if the reverse link loading is above a defined high loading threshold.

24. The method of claim 22, wherein determining whether to operate in the first mode or in the second mode is further based on determining how many mobile stations are in one or more of the one or more groups, such that selective operation in the first and second modes depends on reverse link loading and the number of mobile stations subject to common rate control.