Adaptive gain adjustment control

• US 6,898,193 B2
• Filed: 06/20/2002
• Issued: 05/24/2005
• Est. Priority Date: 06/20/2002
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Saifuddin, Ahmed
• Primary Examiner(s): Phan, Man U.
• Application Number:
  US10/177,132
• Publication Number:
  US 20030235160A1
• Time in Patent Office: 1,069 Days
• Field of Search: H04/B00.1/00, H04/B00.1/02, H04/B00.7/00, H04/B00.7/26, H04/B00.7/005, H04/B00.7/216, H04/J00.3/08, H04/J00.3/22, H04/Q00.7/00, H04/Q00.7/30, 370/310, 370/318, 370/320, 370/326, 370/328, 370/335, 370/342, 370/343, 370/465, 370/468, 370/252, 370/329, 455/69, 455/70, 455/115, 455/127, 455/422, 455/442, 455/522, 455/524, 455/574, 455/575, 375/316, 375/200
• US Class Current: 370/326
• CPC Class Codes: H04L 1/1825 Adaptation of specific ARQ protocol parameters according to transmission conditions
• CPC Class Codes: H04W 52/48 during retransmission after error or non-acknowledgment
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment

Abstract

Systems and techniques are disclosed relating to telecommunications which include transmitting a plurality of data groups to a receiver at a first power level, retransmitting a first one of the data groups to the receiver at a second power level lower than the first power level, providing feedback from the receiver relating to the retransmission of the first one of the data groups, and retransmitting a second one of the data groups to the receiver at a third power level different from the second power level, the third power level being a function of the feedback. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or the meaning of the claims.

Claims

1. A method of adaptively adjusting a traffic-to-pilot ratio of frames being retransmitted on a reverse link from a wireless device, comprising:

initially transmitting a frame at a predetermined traffic-to-pilot ratio;

retransmitting the frame a first time with a gain based on the predetermined traffic-to-pilot ratio;

adjusting the traffic-to-pilot ratio based on whether the retransmitted frame was decoded successfully; and

retransmitting the frame a second time with a gain based on a lowest allowable traffic-to-pilot ratio if the adjusted traffic-to-pilot ratio decreases below the lowest allowable traffic-to-pilot ratio.

2. A method of claim 1, adjusting the traffic-to-pilot ratio based on whether the retransmitted frame was decoded successfully, comprises:

decreasing the traffic-to-pilot ratio by an adjustment factor if the retransmitted frame was decoded successfully.

3. A method of claim 1, wherein, adjusting the traffic-to-pilot ratio based on whether the retransmitted frame was decoded successfully, comprises:

increasing the traffic-to-pilot ratio by an adjustment factor if the first retransmitted frame was undecodable.

4. A method of claim 3, further comprising:

combining information from the undecodable frame and information from the second retransmitted frame to generate a decodable frame; and

decoding the decodable frame.

6. A method of claim 1, wherein the frame is transmitted on the reverse link from a wireless device.

7. A method of claim 2, wherein the adjustment factor depends on a data rate at which the frame is transmitted.

8. A method of claim 2, wherein the adjustment factor depends on channel conditions.

9. A method of claim 1, wherein the predetermined traffic-to-pilot ratio depends on a frame size of the frame being transmitted.

10. A method of claim 1, wherein the predetermined traffic-to-pilot ratio depends on a data rate at which the frame is being transmitted.

5. A method of adaptively adjusting a traffic-to-pilot ratio of frames being retransmitted on a reverse link from a wireless device, comprising:

initially transmitting a frame at a predetermined traffic-to-pilot ratio;

retransmitting the frame a first time with a gain based on the predetermined traffic-to-pilot ratio;

adjusting the traffic-to-pilot ratio based on whether the retransmitted frame was decoded successfully; and

wherein if the adjusted traffic-to-pilot ratio increases above a highest allowable traffic-to-pilot ratio,

retransmitting the frame a second time with a gain based on the highest allowable traffic-to-pilot ratio.

11. A cellular communication system, comprising:

a base station; and

a wireless device, comprising;

a transmitter configured to initially transmit a frame on a reverse link to the base station with a gain based on a predetermined traffic-to-pilot ratio, wherein the transmitter retransmits the frame a first time to the base station upon receiving an indication over a forward link from the base station that the frame was not decoded successfully by the base station;

a controller configured to adjust the traffic-to-pilot ratio based on whether the base station decodes the retransmitted frame successfully,

wherein the transmitter retransmits the frame a second time to the base station with a gain based on a lowest allowable traffic-to-pilot ratio if the adjusted traffic-to-pilot ratio decreases below the lowest allowable traffic-to-pilot ratio.

12. A cellular communication system of claim 11, wherein the controller is configured to decrease the traffic-to-pilot ratio by an adjustment factor if the retransmitted frame was decoded successfully.

13. A cellular communication system of claim 11, wherein the controller increases the traffic-to-pilot ratio by an adjustment factor if the first retransmitted frame was undecodable.

15. A cellular communication system of claim 12, wherein the adjustment factor depends on a data rate at which the frame is transmitted.

16. A cellular communication system of claim 12, wherein the adjustment factor depends on channel conditions.

17. A cellular communication system of claim 11, wherein the predetermined traffic-to-pilot ratio depends on a frame size of the frame being transmitted.

18. A cellular communication system of claim 11, wherein the predetermined traffic-to-pilot ratio depends on a data rate at which the frame is being transmitted.

19. A cellular communication system of claim 11, wherein the base station comprises:

a soft combiner that soft combines information from the undecodable frame and information from the second retransmitted frame to generate a decodable frame.

20. A cellular communication system of claim 19, wherein the base station further comprises:

a decoder configured to decode the decodable frame that includes the soft combined information from the undecodable frame and the retransmitted frame.

14. A cellular communication system, comprising:

a base station; and

a wireless device, comprising;

a transmitter configured to initially transmit a frame on a reverse link to the base station with a gain based on a predetermined traffic-to-pilot ratio, wherein the transmitter retransmits the frame a first time to the base station upon receiving an indication over a forward link from the base station that the frame was not decoded successfully by the base station;

a controller configured to adjust the traffic-to-pilot ratio based on whether the base station decodes the retransmitted frame successfully, and wherein if the adjusted traffic-to-pilot ratio increases above a highest allowable traffic-to-pilot ratio, the controller instructs the transmitter to retransmit the frame a second time with a gain based on the highest allowable traffic-to-pilot ratio.

21. A wireless device that adaptively adjusts a traffic-to-pilot ratio of frames being retransmitted on a reverse link from the wireless device comprising:

a transmitter configured to initially transmit a frame on the reverse link with a gain based on a predetermined traffic-to-pilot ratio, wherein the transmitter retransmits the frame a first time upon receiving an indication that the frame was not decoded successfully;

a controller configured to adjust the traffic-to-pilot ratio based on whether the retransmitted frame was decoded successfully,

wherein the transmitter retransmits the frame a second time with a gain based on a lowest allowable traffic-to-pilot ratio if the adjusted traffic-to-pilot ratio decreases below the lowest allowable traffic-to-pilot ratio.

22. A wireless device of claim 21, wherein the controller is configured to decrease the traffic-to-pilot ratio by an adjustment factor if the retransmitted frame was decoded successfully.

23. A wireless device of claim 21, wherein the controller increases the traffic-to-pilot ratio by an adjustment factor if the retransmitted frame was undecodable.

25. A wireless device of claim 22, wherein the adjustment factor depends on a data rate at which the frame is transmitted.

26. A wireless device of claim 22, wherein the adjustment factor depends on channel conditions.

27. A wireless device of claim 21, wherein the predetermined traffic-to-pilot ratio depends on a frame size of the frame being transmitted.

28. A wireless device of claim 21, wherein the predetermined traffic-to-pilot ratio depends on a data rate at which the frame is being transmitted.

24. A wireless device that adaptively adjusts a traffic-to-pilot ratio of frames being retransmitted on a reverse link from the wireless device, comprising:

a transmitter configured to initially transmit a frame on the reverse link with a gain based on a predetermined traffic-to-pilot ratio, wherein the transmitter retransmits the frame a first time upon receiving an indication that the frame was not decoded successfully;

a controller configured to adjust the traffic-to-pilot ratio based on whether the retransmitted frame was decoded successfully, and

wherein if the adjusted traffic-to-pilot ratio increases above a highest allowable traffic-to-pilot ratio, the controller instructs the transmitter to retransmit the frame a second time with a gain based on the highest allowable traffic-to-pilot ratio.