Uplink load control including individual measurements

• US 20070253363A1
• Filed: 04/28/2006
• Published: 11/01/2007
• Est. Priority Date: 04/28/2006
• Status: Active Grant

• Current Assignee: RPX Corporation
• Original Assignee: Alcatel-Lucent USA, Inc. (Nokia Corporation)
• Inventors: Mueckenheim, Jens, Schacht, Mirko, Bachl, Rainer
• Granted Patent: US 7,920,517 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04B 17/345 Interference values signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] H04B17/336
• CPC Class Codes: H04B 17/382 for resource allocation, admission control or handover
• CPC Class Codes: H04W 28/10 Flow control between communication endpoints
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/34 TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
• CPC Class Codes: H04W 52/343 taking into account loading or congestion level
• CPC Class Codes: H04W 72/54 based on quality criteria

Abstract

A technique is disclosed for determining values of different portions of a total uplink interference, which can be used for scheduling and load control at a base station, for example. A disclosed example includes obtaining measurements from individual users and using those measurements to determine corresponding portions of a total uplink interference at the base station. One portion is associated with users that are controlled by a scheduler for that base station. Another portion is associated with users that are not controlled by that scheduler. Determining each of the portions individually and using a received total wideband power measurement allows for determining each of the major portions of the total uplink interference at a base station.

Claims

1. A method of facilitating wireless communications, comprising:

determining a first portion of an uplink interference associated with at least one first user controlled by a scheduler based upon measurements from at least the one first user that indicate a data-chip energy to total interference ratio and a traffic to pilot ratio; and

determining a second portion of the uplink interference associated with at least one second user not controlled by the scheduler based upon measurements from the at least one second user that indicate a data-chip energy to total interference ratio and traffic to pilot power ratio.

2. The method of claim 1, comprising

controlling a load at a base station associated with the scheduler based upon the determined first and second portions of the uplink interference.

3. The method of claim 1, comprising

scheduling at least one user based upon at least the determined first portion of the uplink interference.

4. The method of claim 1, wherein there are a plurality of the first users and a plurality of the second users and comprising

determining a corresponding plurality of first products of the measurements from each of the first users;

determining a first sum of the determined plurality of first products;

determining a corresponding plurality of second products of the measurements from each of the second users; and

determining a second sum of the determined plurality of second products.

5. The method of claim 4, comprising

determining the first sum and the second sum, respectively, for each of a plurality of time intervals;

establishing a set of linear equations that includes at least the determined sums; and

using the established set of linear equations for determining a value of the first and second portions of the uplink interference, respectively.

6. The method of claim 5, comprising

determining an estimated value of each of the first and second portions from the set of linear equations;

and

determining an absolute value of each of the first and second portions by normalizing the corresponding determined estimated values.

7. The method of claim 6, comprising

determining the estimated value by determining a right singular vector corresponding to a smallest singular value of the set of linear equations.

8. The method of claim 6, comprising

determining the absolute values from a relationship between each of the first and second portions, a background interference and a total uplink interference.

9. The method of claim 5, comprising

weighting an influence that at least a selected one of linear equations has on the determined values based upon a difference in time between a current time and the time interval corresponding to the selected one of the linear equations.

10. The method of claim 9, comprising

progressively decreasing the influence of each of the linear equations as the linear equations become older in time.

11. The method of claim 5, comprising

selecting a number of the time intervals for the establishing step;

and

dropping an oldest of the linear equations from the established set each time that a new linear equation corresponding to a new time interval is available such that a number of linear equations in the established set remains consistent with the selected number of time intervals.

12. The method of claim 4, wherein the determined first sum indicates a signal to interference ratio of the first users and the determined second sum indicates a signal to interference ratio of the second users.

13. The method of claim 1, comprising

determining the first and second portions periodically.

14. The method of claim 13, comprising

determining the first and second portions at each time corresponding to a frame.

15. The method of claim 13, comprising

storing a plurality of the determined first and second portions and using the stored portions as part of a set of linear equations for determining a next one of the first and second portions.

16. The method of claim 1, comprising

determining a received total wideband power at a base station associated with the scheduler;

and

using the determined received total wideband power and the measurements from the at least one first and second users for determining the first and second portions.

17. The method of claim 1, comprising

determining a background noise portion of the uplink interference.