Method and apparatus for fast closed-loop rate adaptation in a high rate packet data transmission

• US 20070064646A1
• Filed: 11/03/2006
• Published: 03/22/2007
• Est. Priority Date: 05/12/2000
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Sindhushayana, Nagabhushana, Attar, Rashid, Esteves, Eduardo
• Granted Patent: US 8,498,308 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04W 16/02 Resource partitioning among network components, e.g. reuse partitioning
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters

Abstract

In a high data rate communication system capable of variable rate transmission, an open loop rate control can be adjusted with a closed loop rate control to maximize throughput. An access point generates interleaved multi-slot packets that allow an access terminal to transmit indicator messages to the access point in accordance with recently received data carried within slots of the multi-slot packets.

Claims

1. A method for wireless communication, comprising:

receiving a first slot of a first multi-slot packet;

decoding the first slot of the first multi-slot packet; and

terminating transmission of remaining slots of the first multi-slot packet if the decoding is successful.

2. The method as in claim 1, if decoding of the first multi-slot packet is not successful, the method further comprising:

receiving a next slot of the first multi-slot packet;

combining the first slot and the next slot of the first multi-slot packet to form a combination;

decoding the combination; and

terminating transmission of remaining slots of the first multi-slot packet if decoding of the combination is successful.

3. The method as in claim 1, wherein decoding the first slot comprises:

checking a cyclic redundancy code of the first slot.

4. The method as in claim 1, further comprising:

transmitting, periodically, information indicative of a quality measure of the wireless channel,

wherein terminating transmission of remaining slots of the first multi-slot packet if the decoding is successful further comprises transmitting a closed loop rate control message.

5. The method as in claim 1, wherein if decoding is successful, the method further comprising:

transmitting an indicator message indicating successful decoding.

7. The method as in claim 2, wherein combining the first slot and the next slot of the first multi-slot packet to form a combination further comprises:

accumulating soft code symbols.

8. The method as in claim 2, wherein the first slot and the next slot of the multi-slot packet are received in non-contiguous time slots.

11. The method as in claim 7, wherein decoding the combination further comprises:

generating soft code symbols for each received slot.

12. The method as in any of claim 1, 2, 7 or 11, wherein each slot of the first multi-slot packet is received at a predetermined time slot.

13. The method as in claim 2, wherein terminating comprises:

transmitting an indicator message indicating successful reception.

14. The method as in claim 13, further comprising:

receiving a first slot of a second multi-slot packet in a time slot allocated to one of the remaining slots of the first multi-slot packet.

15. The method as in any of claim 1, 2, 7, 11, 13 or 14, wherein the first multi-slot packet has a target packet error rate corresponding to a normal end of the first multi-slot packet, and wherein a packet error rate of the received first multi-slot packet is different from the target packet error rate.

16. The method as in claim 15, wherein the normal end of the first multi-slot packet corresponds to transmission of all slots of the multi-slot packet.

17. The method as any of claim 1, 2, 7, 11, 13, 14 or 16, wherein the first multi-slot packet has a target data rate corresponding to transmission of all slots of the first multi-slot packet, and wherein a data rate of the received first multi-slot packet is greater than the target data rate.

18. The method as in claim 17, wherein the terminating provides closed loop rate adaptation for multi-slot packet data rates.

19. The method as in any of claim 16 or 18, further comprising:

transmitting a data rate indicator, wherein the target data rate for the first multi-slot packet is a function of the data rate indicator.

20. The method as claim 1, wherein each slot of the first multi-slot packet is received at a predetermined time slot and wherein the predetermined time slots of the first multi-slot packet are interlaced with predetermined gap slots in an alternating pattern.

21. The method as in claim 20, wherein receiving slots of the multi-slot packet interlaced with the predetermined gap slots further comprises:

receiving the slots of the multi-slot packet in non-contiguous time slots.

22. The method as in claim 20, comprising:

decoding a slot of the multi-slot packet in a time slot corresponding to a predetermined gap slot, wherein the gap slot occurs after the predetermined time of the slot of the multi-slot packet.

23. The method as in claim 2, further comprising:

receiving all slots of the first multi-slot packet;

combining all slots of the first multi-slot packet to form a combination;

decoding the combination;

transmitting a negative acknowledgment if decoding of the combination is not successful; and

transmitting an indicator message indicating successful reception if decoding of the combination is successful.

24. The method as in claim 23, wherein transmitting a negative acknowledgment further comprises:

sending an extend indicator,

wherein the method further comprises;

receiving retransmission of at least one of the slots of the first multi-slot packet in response to sending the extend indicator.

57. The method as in claim 1, wherein if decode is not successful, the method further comprising:

sending a negative acknowledgement (NAK); and

sending an extend indicator;

wherein the method further comprises;

receiving retransmission of at least one of the slots of the first multi-slot packet in response to sending the extend indicator.

25. A method for wireless communication, comprising:

transmitting a first slot of a first multi-slot packet;

receiving an indicator message indicating a reception status of the first slot of the first multi-slot packet; and

canceling transmission of remaining slots of the first multi-slot packet if the indicator message is an acknowledgment.

6. The method as in claim 36, wherein transmitting the indicator message further comprises:

transmitting the indicator message at a time proportional to the time required for successful decoding.

26. The method as in claim 25, if the indicator message is negative, the method further comprising:

transmitting a next slot of the first multi-slot packet;

receiving an indicator message indicating a reception status of the next slot of the first multi-slot packet; and

canceling transmission of remaining slots of the first multi-slot packet if the indicator message is an acknowledgment.

27. The method as in claim 25, further comprising:

encoding the first multi-slot packet; and

partitioning the first multi-slot packet into multiple slots.

28. The method as in any of claim 25 to 27, wherein each slot of the first multi-slot packet is transmitted at a predetermined time slot.

29. The method as in claim 25, further comprising:

transmitting a first slot of a second multi-slot packet in a time slot allocated to one of the remaining slots of the first multi-slot packet.

30. The method as in any of claim 25, 26, 27 or 29, wherein the first multi-slot packet has a target packet error rate corresponding to a normal end of the first multi-slot packet, and wherein a packet error rate of the first multi-slot packet is different from target packet error rate.

31. The method as in claim 30, wherein the normal end of the first multi-slot packet corresponds to transmission of all slots of the multi-slot packet.

32. The method as any of claim 25, 26, 27 or 29, wherein the first multi-slot packet has a target data rate corresponding to transmission of all slots of the first multi-slot packet, and wherein a data rate of the transmitted first multi-slot packet is greater than the target data rate.

33. The method as in claim 25, wherein the indicator message provides closed loop rate adaptation for multi-slot packet data rates.

34. The method as in claim 33, further comprising:

receiving a data rate indicator; and

determining a target data rate for the first multi-slot packet as a function of the data rate indicator.

35. The method as in claim 25, wherein each slot of the first multi-slot packet is transmitted at a predetermined time slot and wherein the predetermined data slots are interlaced with predetermined gap slots in an alternating pattern.

36. The method as in claim 25, further comprising:

transmitting all slots of the first multi-slot packet;

receiving an extend indicator; and

retransmitting at least one of the slots of the first multi-slot packet in response to receiving the extend indicator.

37. The method as in claim 27, wherein coding further comprises:

applying a cyclic redundancy code to the first slot.

38. The method as in claim 25, further comprising:

receiving, periodically, information indicative of a quality measure of the wireless channel,

wherein canceling transmission of remaining slots of the first multi-slot packet if the decoding is successful further comprises receiving a closed loop rate control message.

39. A wireless apparatus, comprising:

means for receiving a first slot of a first multi-slot packet;

means for decoding the first slot of the first multi-slot packet; and

means for terminating transmission of remaining slots of the first multi-slot packet if the decoding is successful.

9. The method as in claim 39, wherein each slot of the first multi-slot packet is received in time slots contiguous to gap slots.

10. The method as in claim 39, further comprising:

receiving a first slot of a second multi-slot packet in a time slot allocated to one of the remaining non-contiguous slots of the first multi-slot packet.

40. The apparatus as in claim 39, further comprising:

means for receiving a next slot of the first multi-slot packet if decoding of the first multi-slot packet is not successful;

means for combining the first slot and the next slot of the first multi-slot packet to form a combination;

means for decoding the combination; and

means for terminating transmission of remaining slots of the first multi-slot packet if decoding of the combination is successful.

41. A wireless apparatus as in any of claim 39 or 40, wherein the first multi-slot packet has a target packet error rate corresponding to a normal end of the first multi-slot packet, and wherein a packet error rate of the received first multi-slot packet is different from the target packet error rate, and further comprising:

means for transmitting a data rate indicator, wherein the target data rate for the first multi-slot packet is a function of the of the data rate indicator.

53. The apparatus as in any of claim 39 or 40 wherein the apparatus is a computer program product that increases data rate and efficiency when coupled to a computing device.

42. A wireless apparatus, comprising:

means for transmitting a first slot of a first multi-slot packet;

means for receiving an indicator message indicating a reception status of the first slot of the first multi-slot packet; and

means for canceling transmission of remaining slots of the first multi-slot packet if the indicator message is an acknowledgment.

43. The wireless apparatus as in claim 42, further comprising:

means for transmitting a next slot of the first multi-slot packet if the indicator message is negative;

means for receiving an indicator message indicating a reception status of the next slot of the first multi-slot packet; and

means for canceling transmission of remaining slots of the first multi-slot packet if the indicator message is an acknowledgment.

44. The wireless apparatus as in any of claim 42 or 43, wherein the first multi-slot packet has a target packet error rate corresponding to a normal end of the first multi-slot packet, and wherein a packet error rate of the first multi-slot packet is different from the target packet error rate, and further comprising:

means for receiving a data rate indicator; and

means for determining a target data rate for the first multi-slot packet as a function of the data rate indicator.

54. The apparatus as in any of claim 42 or 43 wherein the apparatus is a computer program product that increases data rate and efficiency when coupled to a computing device.

45. A computer program product, comprising:

computer-readable medium; and

code for causing a computer to receive a first slot of a first multi-slot packet;

code for causing a computer to decode the first slot of the first multi-slot packet; and

code for causing a computer to terminate transmission of the remaining slots of the first multi-slot packet if the decode is successful.

46. The computer program product of claim 45, wherein the computer program product further comprises:

code for causing a computer to receive a next slot of the first multi-slot packet if the decode is not successful;

code for causing a computer to combine the first slot and the next slot of the first multi-slot packet to form a combination;

code for causing a computer to decode the combination; and

code for causing a computer to terminate the remaining slots of the first multi-slot packet if decoding of the combination is successful.

47. The computer program product of claim 45, wherein the computer program product further comprises:

code for causing a computer to periodically transmit information indicative of a quality measure of the wireless channel,

wherein terminating transmission of remaining slots of the first multi-slot packet further comprises transmitting a closed loop rate control message if the decoding is successful.

52. The computer program product of claim 46, wherein the computer program product further comprises:

code for causing a computer to receive all slots of the first multi-slot packet;

code for causing a computer to combine all slots of the first multi-slot packet to form a combination;

code for causing a computer to decode the combination;

code for causing a computer to transmit a negative acknowledgment if decoding of the combination is not successful; and

code for causing a computer to transmit an indicator message to indicate successful reception if decoding of the combination is successful.

48. A computer program product, comprising:

computer-readable medium; and

code for causing a computer to transmit a first slot of a first multi-slot packet;

code for causing a computer to receive an indicator message indicating a reception status of the first slot of the first multi-slot packet; and

code for causing a computer to cancel transmission of remaining slots of the first multi-slot packet if the indicator message is an acknowledgment.

49. The computer program product of claim 48, further comprising:

computer-readable medium; and

code for causing a computer to calculate a number of slots for transmission of a packet of data in a multi-slot packet.

50. The computer program product of claim 48, wherein the computer program product further comprises:

code for causing a computer to transmit a next slot of the first multi-slot packet if the indicator message is negative;

code for causing a computer to receive an indicator message indicating a reception status of the next slot of the first multi-slot packet; and

code for causing a computer to cancel transmission of remaining slots of the first multi-slot packet if the indicator message is an acknowledgment.

51. The computer program product of claim 48, wherein the computer program further comprises:

code for causing a computer to encode the first multi-slot packet; and

code for causing a computer to partition the first multi-slot packet into multiple slots.

55. A computer program which makes a computer execute:

a first procedure for receiving a first slot of a first multi-slot packet;

a second procedure for decoding the first slot of the first multi-slot packet; and

a third procedure for terminating transmission of the remaining slots of the first multi-slot packet if the decoding is successful.

56. A computer program which makes a computer execute:

a first procedure for transmitting a first slot of a first multi-slot packet;

a second procedure for receiving an indicator message indicating a reception status of the first slot of the first multi-slot packet; and

a third procedure for canceling transmission of remaining slots of the first multi-slot packet if the indicator message is an acknowledgment.