METHOD AND APPARATUS FOR HIGH RATE PACKET DATA TRANSMISSION

• US 20130094391A1
• Filed: 12/10/2012
• Published: 04/18/2013
• Est. Priority Date: 11/03/1997
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Padovani, Roberto, Bender, Paul E., Black, Peter J., Grob, Matthew S., Hinderling, Jurg K., Sindhushayana, Nagabhushana T., Wheatley, Charles E. III
• Granted Patent: US 9,001,735 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04B 7/264 for data rate control
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/1809 Selective-repeat protocols
• CPC Class Codes: H04L 1/1829 Arrangements specially adapted for the receiver end
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 28/22 Negotiating communication rate
• CPC Class Codes: H04W 74/04 Scheduled access hybrid access H04W74/02
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

In a data communication system capable of variable rate transmission, high rate packet data transmission improves utilization of the forward link and decreases the transmission delay. Data transmission on the forward link is time multiplexed and the base station transmits at the highest data rate supported by the forward link at each time slot to one mobile station. The data rate is determined by the largest C/I measurement of the forward link signals as measured at the mobile station. Upon determination of a data packet received in error, the mobile station transmits a NACK message back to the base station. The NACK message results in retransmission of the data packet received in error. The data packets can be transmitted out of sequence by the use of sequence number to identify each data unit within the data packets.

Claims

1. A method for wireless communication, comprising:

measuring channel quality of a communication link in a wireless communication system;

determining a quality indicator based on the measured channel quality;

transmitting the quality indicator to a base station; and

receiving from the base station a data packet having a variable packet size determined based on the quality indicator.

2. The method of claim 1, wherein the quality indicator has one of a set of possible values, and wherein one of a set of supported packet sizes is selected based on the value of the quality indicator.

3. The method of claim 1, wherein the variable packet size is determined based further on an amount of resources used to transmit the data packet.

4. The method of claim 1, wherein the receiving a data packet comprises

receiving the data packet sent using a modulation format determined based on the quality indicator.

5. The method of claim 1, wherein the quality indicator has one of a set of possible values, and wherein each of the set of possible values of the quality indicator is associated with one of a set of supported data rates.

6. The method of claim 1, wherein the receiving a data packet comprises

receiving the data packet in a variable number of time slots determined based on the quality indicator.

7. The method of claim 1, wherein the data packet is associated with an overhead of a fixed size.

8. The method of claim 1, wherein the measuring channel quality comprises periodically measuring the channel quality of the communication link in each of a plurality of time periods, and wherein the transmitting the quality indicator comprises periodically transmitting the quality indicator in each of the plurality of time periods.

9. The method of claim 1, further comprising:

receiving a pilot from the base station, and

wherein the measuring channel quality comprises measuring the channel quality of the communication link based on the received pilot.

10. An apparatus for wireless communication, comprising:

at least one processor configured to;

measure channel quality of a communication link in a wireless communication system;

determine a quality indicator based on the measured channel quality;

send the quality indicator to a base station; and

receive from the base station a data packet having a variable packet size determined based on the quality indicator.

11. The apparatus of claim 10, wherein the quality indicator has one of a set of possible values, and wherein one of a set of supported packet sizes is selected based on the value of the quality indicator.

12. The apparatus of claim 10, wherein the at least one processor is configured to receive the data packet sent using a modulation format determined based on the quality indicator.

13. The apparatus of claim 10, wherein the at least one processor is configured to receive the data packet in a variable number of time slots determined based on the quality indicator.

14. The apparatus of claim 10, wherein the data packet is associated with an overhead of a fixed size.

15. An apparatus for wireless communication, comprising:

means for measuring channel quality of a communication link in a wireless communication system;

means for determining a quality indicator based on the measured channel quality;

means for transmitting the quality indicator to a base station; and

means for receiving from the base station a data packet having a variable packet size determined based on the quality indicator.

16. The apparatus of claim 15, wherein the quality indicator has one of a set of possible values, and wherein one of a set of supported packet sizes is selected based on the value of the quality indicator.

17. The apparatus of claim 15, wherein the means for receiving a data packet comprises means for receiving the data packet sent using a modulation format determined based on the quality indicator.

18. The apparatus of claim 15, wherein the means for receiving a data packet comprises means for receiving the data packet in a variable number of time slots determined based on the quality indicator.

19. The apparatus of claim 15, wherein the data packet is associated with an overhead of a fixed size.

20. A computer program product, comprising:

a non-transitory computer-readable medium comprising;

code for causing at least one processor to measure channel quality of a communication link in a wireless communication system;

code for causing the at least one processor to determine a quality indicator based on the measured channel quality;

code for causing the at least one processor to send the quality indicator to a base station; and

code for causing the at least one processor to receive from the base station a data packet having a variable packet size determined based on the quality indicator.

21. A method for wireless communication, comprising:

receiving a quality indicator determined based on measured channel quality of a communication link in a wireless communication system;

determining a packet size based on the quality indicator; and

transmitting a data packet of the determined packet size.

22. The method of claim 21, wherein the quality indicator has one of a set of possible values, and wherein one of a set of supported packet sizes is selected based on the value of the quality indicator.

23. The method of claim 21, wherein the determining a packet size comprises determining the packet size based further on an amount of resources used to transmit the data packet.

24. The method of claim 21, further comprising:

determining a modulation format based on the quality indicator, and

wherein the transmitting a data packet comprises transmitting the data packet using the determined modulation format.

25. The method of claim 21, wherein the quality indicator has one of a set of possible values, and wherein each of the set of possible values of the quality indicator is associated with one of a set of supported data rates.

26. The method of claim 21, wherein the transmitting a data packet comprises transmitting the data packet in a variable number of time slots determined based on the quality indicator.

27. The method of claim 21, wherein the data packet is associated with an overhead of a fixed size.

28. The method of claim 21, wherein the receiving a quality indicator comprises periodically receiving the quality indicator in each of a plurality of time periods.

29. The method of claim 21, further comprising:

sending a pilot from the base station, and wherein the channel quality of the communication link is measured based on the pilot.

30. An apparatus for wireless communication, comprising:

at least one processor configured to;

receive a quality indicator determined based on measured channel quality of a communication link in a wireless communication system;

determine a packet size based on the quality indicator; and

send a data packet of the determined packet size.

31. The apparatus of claim 30, wherein the quality indicator has one of a set of possible values, and wherein one of a set of supported packet sizes is selected based on the value of the quality indicator.

32. The apparatus of claim 30, wherein the at least one processor is configured to:

determine a modulation format based on the quality indicator; and

send the data packet using the determined modulation format.

33. The apparatus of claim 30, wherein the at least one processor is configured to send the data packet in a variable number of time slots determined based on the quality indicator.

34. The apparatus of claim 30, wherein the data packet is associated with an overhead of a fixed size.

35. An apparatus for wireless communication, comprising:

means for receiving a quality indicator determined based on measured channel quality of a communication link in a wireless communication system;

means for determining a packet size based on the quality indicator; and

means for transmitting a data packet of the determined packet size.

36. The apparatus of claim 35, wherein the quality indicator has one of a set of possible values, and wherein one of a set of supported packet sizes is selected based on the value of the quality indicator.

37. The apparatus of claim 35, further comprising:

means for determining a modulation format based on the quality indicator, and

wherein the means for transmitting a data packet comprises means for transmitting the data packet using the determined modulation format.

38. The apparatus of claim 35, wherein the means for transmitting a data packet comprises means for transmitting the data packet in a variable number of time slots determined based on the quality indicator.

39. The apparatus of claim 35, wherein the data packet is associated with an overhead of a fixed size.

40. A computer program product, comprising:

a non-transitory computer-readable medium comprising;

code for causing at least one processor to receive a quality indicator determined based on measured channel quality of a communication link in a wireless communication system;

code for causing the at least one processor to determine a packet size based on the quality indicator; and

code for causing the at least one processor to send a data packet of the variable packet size.