SERVING SECTOR INTERFERENCE BROADCAST AND CORRESPONDING RL TRAFFIC POWER CONTROL

• US 20080119215A1
• Filed: 09/06/2007
• Published: 05/22/2008
• Est. Priority Date: 09/08/2006
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Gorokhov, Alexei, Ji, Tingfang, Prakash, Rajat, Borran, Mohammad Jaber, Kannan, Arumugam Chendamarai
• Granted Patent: US 8,195,097 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04W 52/10 Open loop power control
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/244 Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI]
• CPC Class Codes: H04W 52/247 where the output power of a terminal is based on a path parameter sent by another terminal
• CPC Class Codes: H04W 52/265 taking into account the quality of service QoS
• CPC Class Codes: H04W 52/283 Power depending on the position of the mobile
• CPC Class Codes: H04W 52/362 Aspects of the step size
• CPC Class Codes: H04W 52/44 in connection with interruption of transmission
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment

Abstract

Systems and methodologies are described that facilitate broadcasting an interference level and adjusting transmit power corresponding to a reverse link in accordance with the interference level. An interference indication can be broadcasted on a broadcast channel in a wireless communication system. In response to the broadcast, mobile devices can adjust transmit power on the reverse link based upon considerations of the interference level. Further, mobile devices can evaluate an initial set point of a transmit power level during periods of inactivity.

Claims

1. A method that facilitates generating an interference indication in a wireless communications system, comprising:

measuring a received interference level;

determining a function of the received interference level; and

broadcasting the function of the received interference level on a physical channel to a plurality of mobile devices to enable quick power adjustment.

2. The method of claim 1, the interference level comprises interference values as functions of frequency wherein multiple values are broadcasted for multiple subcarrier clusters.

3. The method of claim 1, broadcasting the function comprises broadcasting in a small number of slots wherein a slot is a time duration for a hybrid automatic repeat request (HARQ) transmission.

4. The method of claim 1, the interference level is represented by an interference over thermal (IOT) value.

5. The method of claim 1, further comprising receiving an interference value from neighboring sectors via a backhaul.

6. The method of claim 1, determining a function comprising evaluating a minimum between a received IOT level and an IOT threshold level.

7. The method of claim 6, the received IOT level is derived from the measured received interference level.

8. The method of claim 1, the functions comprises determining a minimum between a received IOT level and an IOT ramp value.

9. The method of claim 8, the IOT ramp value is selected to limit a maximum IOT slew.

10. The method of claim 1, determining a function comprising evaluating a filtered IOT based upon an IOT value representing the measured interference level.

11. The method of claim 10, the filtered IOT is determined by filtering the IOT value utilizing at least of a finite impulse response (FIR) filter or an infinite impulse response (IIR) filter.

12. The method of claim 1, the interference level relates to interference caused by mobile devices in a non-serving sector.

14. The wireless communications apparatus of claim 11, wherein the memory further retains instructions for filtering the interference value utilizing one of a FIR filter or an IIR filter.

13. A wireless communications apparatus, comprising:

a memory that retains instructions related to determining an interference value associated with other sector interference, developing a function of the interference value and broadcasting the function with low latency to a plurality of mobile devices; and

an integrated circuit coupled to the memory, configured to execute the instructions retained in the memory.

15. A wireless communications apparatus that generates an interference indication, comprising:

means for identifying an interference level;

means for evaluating a function of the interference level; and

means for transmitting the function of the interference level in a small number of slots to one or more mobile devices to enable power adjustment.

16. The wireless communications apparatus of claim 15, the interference level is represented by an interference over thermal (IOT) value.

17. The wireless communications apparatus of claim 15, means for identifying an interference level comprises means for receiving interference parameters from neighboring sectors.

18. The wireless communications apparatus of claim 15, means for evaluating a function comprising determining a minimum between a received IOT level and an IOT threshold level.

19. The wireless communications apparatus of claim 18, the received IOT level is derived from the identified interference level.

20. The wireless communications apparatus of claim 15, the functions comprises determining a minimum between a received IOT level and an IOT ramp value.

21. The wireless communications apparatus of claim 20, the IOT ramp value is selected to limit a maximum IOT slew.

22. The wireless communications apparatus of claim 15, determining a function comprising evaluating a filtered IOT based upon an IOT value representing the measured interference level.

23. The wireless communications apparatus of claim 15, the filtered IOT is determined by filtering the IOT value utilizing at least of a finite impulse response (FIR) filter or an infinite impulse response (IIR) filter.

24. The wireless communications apparatus of claim 15, the interference level relates to interference caused by mobile devices in a non-serving sector.

25. A computer-readable medium, comprising:

code for causing a computer to measure interference received at a base station;

code for causing a computer to generate a function of an interference level value derived from the measured interference; and

code for causing a computer to broadcast the function on a physical broadcast channel in a small number of slots to a plurality of mobile devices.

26. The machine-readable medium of claim 25, further comprising identifying an interference parameter received from other sector base stations.

27. In a wireless communication system, an apparatus comprising:

an integrated circuit configured to;

determine an interference value related to the amount of interference received from non-serving sectors; and

package the interference value as a function of the value.

28. A method that facilitates adjusting power based upon interference information, comprising:

receiving an interference indication;

evaluating a power adjustment value based at least in part on the received interference indication; and

adjusting transmit power on the reverse link based upon the power adjustment value.

29. The method of claim 28, further comprising determining an open loop power adjustment value during periods of inactivity.

30. The method of claim 29, further comprising utilizing the open loop power adjustment to modify a transmit power level prior to burst data traffic.

31. The method of claim 28, evaluating a power adjustment value is further based upon quality of service (QoS) parameters.

32. The method of claim 28, evaluating a power adjustment value is further based upon a location of a mobile device relative to non-serving base stations.

33. The method of claim 32, transmit power on the reverse link increases as a distance to non-serving base station increases.

34. A wireless communications apparatus, comprising:

a memory that retains instructions related to processing an interference value on a broadcast channel, inferring a power adjustment value based upon the interference value and changing a power level according to the power adjustment value; and

an integrated circuit coupled to the memory, configured to execute the instructions retained in the memory.

35. The wireless communications apparatus of claim 34, wherein the memory further retains instructions for evaluating an open loop adjustment during period of inactivity and changing a power level according to the open loop adjustment before commencing transmission.

36. A wireless communications apparatus that adjusts power on a reverse link, comprising:

means for receiving an interference indication from a broadcast channel;

means for determining a power adjustment value based upon the interference indication; and

means for modifying a transmit power level in accordance with the determined power adjustment value.

37. The wireless communications apparatus of claim 36, further comprising:

means for evaluating an initial transmit power set point prior to transmission; and

means for adjusting reverse link power level according to the initial power set point.

38. A computer-readable medium, comprising:

code for causing a computer to receive a broadcasted interference value;

code for causing a computer to evaluate a power correction parameter based at least in part on the received interference value; and

code for causing a computer to modify transmit power on the reverse link based upon the power correction value.

39. The machine-readable medium of claim 38, further comprising determining an open loop power adjustment value during periods of inactivity.

40. The machine-readable medium of claim 38, further comprising utilizing the open loop power adjustment to modify a transmit power level prior to burst data traffic.

41. The machine-readable medium of claim 38, evaluating a power correction parameter is further based upon quality of service (QoS) parameters.

42. The machine-readable medium of claim 38, evaluating a power correction parameter is further based upon a location of to at least one non-serving base station.

43. The machine-readable medium of claim 42, transmit power on the reverse link increases as a distance to the at least one non-serving base station increases.

44. In a wireless communication system, an apparatus comprising:

an integrated circuit configured to;

evaluate a power adjustment quantity based at least in part upon consideration of broadcasted interference values related to non-serving sectors; and

adjust a transmit power level on a reverse link in accordance with the power adjustment quantity.