System and method for fluid power control of a reverse link communication

• US 7,069,037 B2
• Filed: 04/25/2003
• Issued: 06/27/2006
• Est. Priority Date: 04/11/2003
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Black, Peter J., Bhushan, Naga, Attar, Rashid Ahmed Akbar, Lott, Christopher Gerard, Fan, Mingxi, Au, Jean
• Primary Examiner(s): Orgad, Edan
• Application Number:
  US10/423,578
• Publication Number:
  US 20040214591A1
• Time in Patent Office: 1,159 Days
• Field of Search: 455/522, 455/452.2, 455/306, 455/307, 455/339, 455/554, 455/151.2, 455/67.13, 370/241.1, 370/465, 370/335, 370/342, 370/331, 370/318, 370/333, 375/355, 375/360
• US Class Current: 455/522
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0028 Formatting
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/267 taking into account the information rate
• 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 52/36 with a discrete range or set of values, e.g. step size, ramping or offsets

Abstract

A method and apparatus for determining the data rate of a reverse link communication of an access terminal includes receiving a reverse activity bit (RAB) from an access network in the communication system, and passing the RAB to multiple digital filters to produce filtered RABs. The reverse link data rate is determined based on these filtered values of the RABs. From the filtered RAB values a continuous fluid power level is determined each rate update. The access terminal maps the continuous fluid power level to actual physical transmissions by dithering among discrete power levels allowed by the physical layer.

Claims

1. A method for determining the data rate of a reverse link communication of an access terminal comprising:

receiving a reverse activity bit;

passing said reverse activity bit to a first digital filter to produce a filtered reverse activity bit;

determining a continuous fluid power level based on said filtered reverse activity bit; and

determining the data rate based on said continuous fluid power level.

2. The method of claim 1, wherein said data rate is determined based on determining a traffic-to-pilot power level and a bit allocation, said traffic-to-pilot power level and said bit allocation determined based on said continuous fluid power level.

3. The method of claim 1, wherein said reverse activity bit is received each time slot.

4. The method of claim 1, wherein said first digital filter has a short time constant reflecting short-term power loading of a communication system.

5. The method of claim 1, wherein said first digital filter has a long time constant reflecting long-term power loading of a communication system.

6. The method of claim 1, further comprising transmitting data at said data rate, wherein said data rate is determined by mapping said continuous fluid power level to discrete power levels.

7. The method of claim 6, wherein said continuous fluid power level is mapped to discrete power levels such that an average of said discrete power levels over a period of time approximates an average of said fluid power level over said period of time.

8. The method of claim 1, further comprising passing said reverse activity bit to a second digital filter to produce a second filtered reverse activity bit, wherein said continuous fluid power level is also based on said second filtered reverse activity bit.

9. The method of claim 8, wherein said first digital filter has a short time constant reflecting short-term power loading of a communication system and said second digital filter has a long time constant reflecting long-term power loading of said communication system.

10. The method of claim 9, wherein said continuous fluid power level is determined based on a function parameterized by said second filtered reverse activity bit.

11. The method of claim 9, wherein said continuous fluid power level is determined based on a down function parameterized by said second filtered reverse activity bit if said first filtered reverse activity bit indicates busy short-term power loading of said communication system.

12. The method of claim 11, wherein said down function is further parameterized by a previous continuous fluid power level.

13. The method of claim 9, wherein said continuous fluid power level is determined based on an up function parameterized by said second filtered reverse activity bit if said first filtered reverse activity bit does not indicate busy short-term power loading of said communication system and data and power are not limited.

14. The method of claim 13, wherein said up function is further parameterized by a previous continuous fluid power level.

15. The method of claim 9, further comprising transmitting data at said data rate, wherein said data rate is determined by mapping said continuous fluid power level to discrete power levels.

16. The method of claim 15, wherein said continuous fluid power level is mapped to discrete power levels such that an average of said discrete power levels over a period of time approximates an average of said fluid power level over said period of time by utilizing a token bucket.

17. The method of claim 15, wherein said continuous fluid power level is mapped to discrete power levels using a token bucket, said continuous fluid power level is added to said token bucket and a mapped discrete power level is subtracted from said token bucket.

18. The method of claim 17, wherein said mapped discrete power level does not exceed a cumulative amount of said continuous power level added to said token bucket.

19. The method of claim 17, wherein a cumulative amount of said continuous power level added to said token bucket does not exceed a token bucket level maximum.

20. An apparatus for determining the data rate of a reverse link communication of an access terminal comprising:

means for receiving a reverse activity bit;

means for passing the reverse activity bit to a digital filter to produce a filtered reverse activity bit;

means for determining a continuous fluid power level based on said filtered reverse activity bit; and

means for determining the data rate based on said continuous fluid power level.

21. An apparatus for determining the data rate of a reverse link communication of an access terminal comprising:

a receive subsystem for receiving a reverse activity bit; and

a processor for applying a digital filter to said reverse activity bit to produce a filtered reverse activity bit, determining a continuous fluid power level based on said filtered reverse activity bit, and determining a data rate based on said continuous fluid power level.

22. A computer readable media embodying a method for determining a data rate, the method comprising:

receiving a reverse activity bit;

passing the reverse activity bit to a digital filter to produce a filtered reverse activity bit;

determining a continuous fluid power level based on said filtered reverse activity bit; and

determining the data rate based on said continuous fluid power level.