Uplink load control including individual measurements
View Patent ↗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.
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 , 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.
6. 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.
7. The method of claim 6 , 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.
8. The method of claim 7 , comprising
determining the estimated value by determining a right singular vector corresponding to a smallest singular value of the set of linear equations.
9. The method of claim 7 , comprising
determining the absolute values from a relationship between each of the first and second portions, a background interference and a total uplink interference.
10. The method of claim 6 , 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.
11. The method of claim 10 , comprising
progressively decreasing the influence of each of the linear equations as the linear equations become older in time.
12. The method of claim 6 , 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.
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.
18. The method of claim 1 , wherein the first user is distinct from the second user.