Method of controlling reverse link packet transmission latency based on air-interface loading

• US 8,437,292 B1
• Filed: 06/09/2009
• Issued: 05/07/2013
• Est. Priority Date: 06/09/2009
• Status: Active Grant

• Current Assignee: Sprint Spectrum LP (Deutsche Telekom AG)
• Original Assignee: Sprint Spectrum LP (Deutsche Telekom AG)
• Inventors: Wurtenberger, Andrew, Keshavachandra, Manasa, Hyde, Caleb
• Primary Examiner(s): Rutkowski, Jeffrey M
• Assistant Examiner(s): Bokhari, Syed M
• Application Number:
  US12/481,033
• Time in Patent Office: 1,428 Days
• Field of Search: 370/235, 370241-343, 455/522, 395/500, 375/259
• US Class Current: 370/329
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 72/52 based on load

Abstract

Methods and apparatus for transmitting communications using a radio frequency (RF) communication channel are provided. A network condition and/or a usage level of the RF communication channel are determined. A designated duration is selected based, at least in part, on the network condition and/or usage level. A time period for transmitting a communication in the RF channel is selected such that the time period has a duration corresponding to the designated duration. A transmission in the RF communication channel is initiated during the time period. The designated duration may be adjusted based on further observations of network conditions and/or usage levels.

Claims

1. A method, comprising:

determining a condition of a radio frequency (RF) communication channel;

an access terminal selecting a duration between a minimum duration and a maximum duration based, at least in part, on said determined condition, wherein selecting said duration comprises;

(a) said access terminal receiving an indication of said condition from a base station, (b) selecting an initial duration based at least upon said indication of said condition received from said base station, (c) sending an indication of said initial duration to said base station, (d) receiving an indication of an adjusted duration, wherein said adjusted duration differs from said initial duration, and (e) selecting said adjusted duration as said duration;

said access terminal selecting a time period for transmitting at least part of a communication in said RF communication channel, such that said time period has a duration greater than or equal to said selected duration; and

said access terminal transmitting said at least part of said communication in said RF communication channel during said selected duration of said selected time period.

2. The method of claim 1, wherein transmitting said at least part of said communication comprises transmitting all of said communication in said RF communication channel during said selected duration of said selected time period.

3. The method of claim 1, further comprising:

selecting a transmission mode for said communication from among at least a first transmission mode and a second transmission mode.

4. The method of claim 3, wherein said first transmission mode is a high-capacity mode and said second transmission mode is a low-latency mode.

5. The method of claim 3, wherein selecting said duration based, at least in part, on said determined condition comprises:

selecting said duration based on said transmission mode and said determined condition.

6. The method of claim 1, wherein selecting said duration based, at least in part, on said condition comprises:

said base station selecting said duration;

said access terminal receiving an indication of said selected duration from said base station; and

said access terminal selecting said duration based on said indication of said selected duration received from said base station.

7. The method of claim 1, wherein determining said condition comprises:

said base station determining a reverse noise rise (RNR) in said RF communication channel.

8. The method of claim 1, wherein determining said condition comprises:

said access terminal determining said condition based on at least one reverse activity bit (RAB) received from said base station.

9. The method of claim 1, wherein said time period is a frame, and said selected duration is an integral number of sub-frames of said frame.

10. A method, comprising:

determining a first usage level of a radio frequency (RF) communication channel;

selecting a designated duration based, at least in part, on said first usage level;

transmitting a first communication in said RF communication channel during a first time period, said first time period having a duration corresponding to said designated duration;

determining a second usage level of said RF communication channel;

adjusting said designated duration based, at least in part, on said second usage level, wherein said adjusting comprises;

(i) comparing said second usage level to a threshold, (ii) if said second usage level is greater than said threshold, increasing said designated duration by an adjustment amount, and (iii) if said second usage level is less than said threshold, decreasing said designated duration by said adjustment amount; and

transmitting a second communication in said RF communication channel during a second time period, said second time period having a duration corresponding to said adjusted designated duration.

11. The method of claim 10, wherein said second usage level is determined a preset period of time after said first usage level is determined.

12. The method of claim 10, wherein said designated duration is an integral number of sub-frames and said adjustment amount is one sub-frame.

13. The method of claim 10, wherein adjusting said designated duration based, at least in part, on said second usage level comprises:

adjusting said designated duration between a minimum-duration limit and a maximum-duration limit.

14. A wireless device, comprising:

a transceiver;

a processor; and

data storage, containing program instructions that can be executed by said processor to perform functions, said functions comprising;

determining a condition of a radio frequency (RF) communication channel, selecting a duration between a minimum duration and a maximum duration based, at least in part, on said determined condition, wherein selecting said duration comprises;

(a) receiving an indication of said condition from a base station, (b) selecting an initial duration based at least upon said indication of said condition received from said base station, (c) sending an indication of said initial duration to said base station, (d) receiving an indication of an adjusted duration, wherein said adjusted duration differs from said initial duration, and (e) selecting said adjusted duration as said duration, selecting a time period for transmitting at least part of a communication in said RF communication channel, such that said time period has a duration greater than or equal to said selected designated duration, and transmitting said at least part of said communication in said RF communication channel during said selected duration of said selected time period, via said transceiver.

15. The wireless device of claim 14, wherein said wireless device is an access terminal in communication with said base station.

16. The wireless device of claim 15, wherein said functions further comprise:

receiving an indication of said condition from said base station.

17. The wireless device of claim 15, wherein said functions further comprise:

receiving at least one reverse activity bit (RAB) from said base station; and

determining said condition based on said at least one RAB.

18. The wireless device of claim 14, wherein said functions further comprise:

selecting a transmission mode for said communication; and

selecting said designated duration based on said transmission mode and said condition.

19. The wireless device of claim 14, wherein said time period is a frame, and said selected duration is an integral number of sub-frames of said frame.