METHOD AND APPARATUS FOR HIGH RATE PACKET DATA TRANSMISSION

• US 20030063583A1
• Filed: 11/03/1997
• Published: 04/03/2003
• Est. Priority Date: 11/03/1997
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: BENDER, PAUL E., BLACK, PETER J., SINDHUSHAYANA, NAGABHUSHANA T., HINDERLING, JURG K., GROB, MATTEW S., WHEATLEY, CHARLES E. III, PADOVANI, ROBERTO
• Granted Patent: US 6,574,211 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04B 1/7103 the interference being multiple access interference
• CPC Class Codes: H04B 2201/70702 Intercell-related aspects
• CPC Class Codes: H04B 2201/709709 Methods of preventing interference
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 1/1628 List acknowledgements, i.e. the acknowledgement message consisting of a list of identifiers, e.g. of sequence numbers H04L1/1614 takes precedence
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 28/22 Negotiating communication rate
• CPC Class Codes: H04W 52/04 TPC
• CPC Class Codes: H04W 52/12 Outer and inner loops
• CPC Class Codes: H04W 52/241 taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
• CPC Class Codes: H04W 52/248 where transmission power control commands are generated based on a path parameter
• CPC Class Codes: H04W 52/26 using transmission rate or quality of service QoS [Quality of Service]
• CPC Class Codes: H04W 52/40 during macro-diversity or soft handoff

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 high speed packet data transmission from at least one base station to a mobile station comprising the steps of:

paging a mobile station of a pending data transmission;

measuring C/I of forward link signals from said at least one base station;

selecting a selected base station based on a set of parameters;

identifying said selected base station;

sending a data request message to said selected base station; and

transmitting data from said selected base station at a data rate in accordance with said data request message.

2. The method of claim 1 wherein said measuring, selecting, identifying, and sending steps are performed at each time slot until said data transmission is completed.

3. The method of claim 1 wherein said measuring step is performed by taking into account a received value of a forward activity bit.

4. The method of claim 1 wherein said measuring step is performed on forward link pilot signals from all base stations in an active set of said mobile station.

5. The method of claim 4 wherein an additional base station is added to said active set of said mobile station if a transmit power of said additional base station exceeds a predetermined threshold.

6. The method of claim 1 wherein said selecting step is based on C/I of said forward link signals.

7. The method of claim 1 wherein said selecting step is based on present and previous C/I of said forward link signals.

8. The method of claim 1 wherein said selecting step is performed in accordance with a predetermined hysterisis.

9. The method of claim 8 wherein said predetermined hysterisis is a time based hysterisis.

10. The method of claim 8 wherein said predetermined hysterisis is a level based hysterisis.

11. The method of claim 1 wherein said sending step is performed by covering said data request message with a Walsh code corresponding to said selected base station.

12. The method of claim 11 wherein said Walsh code is 128 chips in length.

13. The method of claim 1 wherein said data request message is indicative of a requested data rate.

14. The method of claim 13 wherein said requested data rate is one of a plurality of supportable data rates.

15. The method of claim 14 wherein said supportable data rates are selected in accordance with a cumulative distribution function of C/I within a cell within which said mobile station and said selected base station reside.

16. The method of claim 1 wherein said data request message is indicative of a quality of a transmission link.

17. The method of claim 1 wherein said data request message occupies an earlier portion of a time slot.

18. The method of claim 1 wherein said transmitting step is scheduled by a scheduler based on a priority of said mobile station.

19. The method of claim 1 wherein said transmitting step is from at most one of said at least one base station at each time slot.

20. The method of claim 1 wherein said selected base station transmits to one mobile station at each time slot.

21. The method of claim 1 wherein said selected base station transmits at or near a maximum available transmit power for said selected base station.

22. The method of claim 1 wherein said transmitting step is performed using orthogonal Walsh channels.

23. The method of claim 22 wherein each orthogonal Walsh channel has a fixed data rate.

24. The method of claim 1 wherein said transmitting step is performed using quadrature phase shift keying.

25. The method of claim 1 wherein said transmitting step is performed using quadrature amplitude modulation.

26. The method of claim 1 wherein said transmitting step is performed using a directional beam.

27. The method of claim 1 wherein said data is transmitted to said mobile station in data packets.

28. The method of claim 27 wherein said data packets are of fixed size for all data rates.

29. The method of claim 27 wherein said data packets are transmitted over one or more time slots.

30. The method of claim 27 wherein each data packet comprises a preamble.

31. The method of claim 30 wherein said preamble is spread with a long PN code.

32. The method of claim 30 wherein a length of said preamble is based on said data rate.

33. The method of claim 27 wherein each data packet comprises data units and wherein each data unit is identified by a sequence number.

34. The method of claim 33 further comprising the step of:

transmitting a negative acknowledgment (NACK) messages for data units not received by said mobile station.

35. The method of claim 34 further comprising the step of:

retransmitting said data units not received by said mobile station in accordance with said NACK messages.

36. The method of claim 1 further comprising the step of:

sending data to all base stations in an active set of said mobile station.

37. The method of claim 36 wherein said selected base station transmits based on a predictive determination of remaining data.

38. A method for high speed packet data transmission from at least one base station to a mobile station in a CDMA communication system comprising the steps of:

first transmitting a pilot signal from each of said at least one base station;

measuring C/I of said pilot signals from said at least one base station;

selecting a selected base station based on a set of parameters;

identifying said selected base station;

sending a data request message to said selected base station; and

second transmitting data from said selected base station at a data rate in accordance with said data request message.

39. The method of claim 38 wherein said measuring, selecting, identifying, and sending steps are performed at each time slot until said data transmission is completed.

40. The method of claim 38 wherein said sending step is performed by covering said data request message with a Walsh code corresponding to said selected base station.

41. The method of claim 38 wherein said data request message is indicative of a requested data rate.

42. The method of claim 38 wherein said data request message is indicative of a quality of a transmission link.

43. The method of claim 38 wherein said selected base station transmits to one mobile station at each time slot.

44. The method of claim 38 wherein said selected base station transmits at or near a maximum available transmit power for said selected base station.

45. The method of claim 38 wherein data is transmitted to said mobile station in data packets, wherein said data packets are transmitted over one or more time slots.

46. The method of claim 45 wherein each data packet comprises data units and wherein each data unit is identified by a sequence number.

47. The method of claim 46 further comprising the step of:

transmitting a negative acknowledgment (NACK) messages for data units not received by said mobile station.

48. The method of claim 47 further comprising the step of:

retransmitting said data units not received by said mobile station in accordance with said NACK messages.

49. An apparatus for high speed packet data transmission from at least one base station to a mobile station comprising:

a transmitter within each of said at least one base station for transmitting paging messages within a forward link signal to said mobile station;

a receiver within said one mobile station for receiving said paging messages and performing C/I measurements of said forward link signals from said transmitters within said at least one base station;

a controller within each of said at least one mobile station, said controller connected to said receiver for receiving said C/I measurements, said controller identifying a selected base station;

a transmitter within said mobile station connected to said controller for transmitting data request messages; and

wherein said transmitter within said selected base station transmits data at a data rate in accordance with said data request message.

50. The apparatus of claim 49 wherein said receiver performs said C/I measurements at each time slot;

said controller identifying said selected base station at each time slot, and said transmitter within said mobile station transmits said data request message at each time slot.

51. The apparatus of claim 49 wherein said receiver performs said C/I measurements by taking into account a received value of a forward activity bit.

52. The apparatus of claim 49 wherein said transmitter within said mobile station further comprises:

a Walsh cover element for covering said data request message with a Walsh code corresponding to said selected base station.

53. The apparatus of claim 49 wherein each of said at least one base station further comprises a queue for storing data.

54. A method for high speed packet data transmission from a mobile station to at least one base station comprising the steps of:

sending a request for high rate transmission at one of a plurality of supportable data rates on a reverse link signal;

receiving and granting said request for high rate transmission;

sending said grant to said mobile station; and

transmitting data at said one of a plurality of supportable data rates.

55. The method of claim 54 wherein said mobile station transmits data a low data rate without a grant from said at least one base station.

56. A transmitter for high speed packet data transmission comprising:

an encoder for receiving data packets and encoding said data packets into encoded packets;

a frame puncture element for receiving said encoded packets and puncturing a portion of said encoded packets to provided punctured packets;

a variable rate controller connected to said frame puncture element for receiving said punctured packets and demultiplexing said punctured packets into parallel channels;

a Walsh cover element connected to said variable rate controller for receiving said parallel channels and covering said parallel channels with Walsh covers to provide orthogonal channels; and

a gain element connected to said Walsh cover element for receiving said orthogonal channels and scaling said orthogonal channels to provide scaled channels.

57. The transmitter of claim 56 wherein said each of said parallel channels has a fixed data rate.

58. The transmitter of claim 56 further comprising:

a multiplexer connected to said gain element, said multiplexer multiplexing pilot and power control bursts with said scaled channels to provide Walsh channels.

59. The transmitter of claim 58 wherein said pilot and power control bursts are located at fixed locations within each time slot.

60. The transmitter of claim 58 wherein said pilot and power control bursts are provided at two locations within each time slot.

61. The transmitter of claim 56 further comprising:

a multiplexer connected to said gain element, said multiplexer multiplexing a preamble with said scaled channels to provide Walsh channels.

62. The transmitter of claim 56 further comprising:

a scrambler interposed between said frame puncture element and said variable rate controller, said scrambler scrambling said punctured packets with a scrambling sequence.

63. The transmitter of claim 56 wherein said each of said Walsh covers is 16 bits in length.