Method and system for a data transmission in a communication system

• US 20040038697A1
• Filed: 12/06/2002
• Published: 02/26/2004
• Est. Priority Date: 08/23/2002
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Bhushan, Naga, Attar, Rashid Ahmed
• Granted Patent: US 7,050,405 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04W 52/12 Outer and inner loops
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/26 using transmission rate or quality of service QoS [Quality of Service]
• CPC Class Codes: H04W 52/48 during retransmission after error or non-acknowledgment

Abstract

Novel data transmission method and apparatus in a communication system require novel method and apparatus for power control and rate of data determination, which are disclosed.

Claims

1. A method for power control of a reverse link channel, the method comprising:

determining a transmit power of a first reverse link channel;

determining a transmit power ratio of the reverse link channel to the first reverse link channel for a data rate to be transmitted on the reverse link channel;

adjusting the transmit power ratio in accordance with a quality metric of the reverse link channel; and

computing the reverse link channel transmit power in accordance with the adjusted transmit power ratio.

2. The method as claimed in claim 1 wherein the determining a transmit power of a first reverse link channel comprises:

determining a transmit power of a first reverse link channel in accordance with a quality metric of a second reverse link channel.

3. The method as claimed in claim 1 wherein the adjusting the transmit power ratio in accordance with a quality metric of the reverse link channel comprises:

increasing the transmit power ratio by a first determined amount when a first determined number of re-transmissions of user data over the reverse link channel failed.

4. The method as claimed in claim 1 wherein the adjusting the transmit power ratio in accordance with a quality metric of the reverse link channel comprises:

decreasing the transmit power ratio by a second determined amount when user data has been successfully transmitted over the reverse link channel within a second determined number of re-transmissions.

5. The method as claimed in claim 1 wherein the adjusting the transmit power ratio in accordance with a quality metric of the reverse link channel comprises:

determining a rise over thermal differential between a transmission interval of the first reverse link channel and a transmission interval of the reverse link channel;

adjusting the rise over thermal differential; and

adjusting the transmit power ratio in accordance with the adjusted rise over thermal differential.

6. The method as claimed in claim 5 wherein the determining a rise over thermal differential between a transmission interval of the first reverse link channel and a transmission interval of the reverse link channel comprises:

measuring at an access point a rise over thermal in a transmission interval of the first reverse link channel;

measuring at the access point a rise over thermal in-the transmission interval of the reverse link channel; and

computing a difference between the rise over thermal in the transmission interval of the first reverse link channel and the rise over thermal in the transmission interval of the reverse link channel.

7. The method as claimed in claim 5 wherein the determining a rise over thermal differential between a transmission interval of the first reverse link channel and the transmission interval of the reverse link channel comprises:

estimating at an access terminal the rise over thermal differential.

8. The method as claimed in claim 7 wherein the estimating at an access terminal the rise over thermal differential comprises:

estimating at an access terminal the rise over thermal differential in accordance with the quality metric of the reverse link channel.

9. The method as claimed in claim 1 wherein the reverse link channel comprises a traffic channel;

and

wherein the first reverse link channel comprises a pilot channel.

10. The method as claimed in claim 2 wherein the second reverse link channel comprises a data request channel.

11. A apparatus for power control of a reverse link channel, the apparatus comprising:

a processor; and

a storage medium coupled to the processor and containing a set of instructions executable by the processor to;

determine a transmit power of a first reverse link channel;

determine a transmit power ratio of the reverse link channel to the first reverse link channel for a data rate to be transmitted on the reverse link channel;

adjust the transmit power ratio in accordance with a quality metric of the reverse link channel; and

compute the reverse link channel transmit power in accordance with the adjusted transmit power ratio.

12. The apparatus as claimed in claim 11 wherein the processor determines a transmit power of a first reverse link channel by executing a set of instructions to:

determine a transmit power of a first reverse link channel in accordance with a quality metric of a second reverse link channel.

13. The apparatus as claimed in claim 11 wherein the processor adjusts the transmit power ratio in accordance with a quality metric of the reverse link channel by executing a set of instructions to:

increase the transmit power ratio by a first determined amount when a first determined number of re-transmissions of user data over the reverse link channel failed.

14. The apparatus as claimed in claim 11 wherein the processor adjusts the transmit power ratio in accordance with a quality metric of the reverse link channel by executing a set of instructions to:

decrease the transmit power ratio by a second determined amount when user data has been successfully transmitted over the reverse link channel within a second determined number of re-transmissions.

15. The apparatus as claimed in claim 11 wherein the processor adjusts the transmit power ratio in accordance with a quality metric of the reverse link channel by executing a set of instructions to:

determine a rise over thermal differential between a transmission interval of the first reverse link channel and a transmission interval of the reverse link channel;

adjust the rise over thermal differential; and

adjust the transmit power ratio in accordance with the adjusted rise over thermal differential.

16. The apparatus as claimed in claim 15 wherein the processor determines a rise over thermal differential between a transmission interval of the first reverse link channel and the transmission interval of the reverse link channel by executing a set of instructions to:

estimating the rise over thermal differential.

17. The apparatus as claimed in claim 16 wherein the processor estimates the rise over thermal differential by executing a set of instructions to:

estimate the rise over thermal differential in accordance with the quality metric of the reverse link channel.

18. The apparatus as claimed in claim 15 further comprising:

a second processor; and

a second storage medium coupled the second processor and containing a set of instructions executable the second processor to;

measure a rise over thermal in a transmission interval of the first reverse link channel;

measuring a rise over thermal in the transmission interval of the reverse link channel; and

computing a difference between the rise over thermal in the transmission interval of the first reverse link channel and the rise over thermal in the transmission interval of the reverse link channel.

19. The apparatus as claimed in claim 11 wherein the reverse link channel comprises a traffic channel;

and

wherein the first reverse link channel comprises a pilot channel.

20. The apparatus as claimed in claim 12 wherein the second reverse link channel comprises a data request channel.

21. The apparatus as claimed in claim 11 wherein the processor and the storage medium are disposed in an access terminal.

22. The apparatus as claimed in claim 18 wherein the second processor and the second storage medium are disposed in an access point.

32. The method as claimed in claim 14 further comprising:

receiving a desired quality of service for the reverse link channel.

23. A method for controlling a reverse link channel power, the method comprising:

determining a transmit power of a first reverse link channel;

determining a transmit power of a second reverse link channel in accordance with the first reverse link channel;

setting a transmit power of the reverse link channel equal to the transmit power of the second reverse link channel; and

determining number of chips in the reverse link channel in accordance with the transmit power of the reverse link channel.

24. The method as claimed in claim 23 wherein the determining a transmit power of a first reverse link channel comprises:

determining a transmit power of a first reverse link channel in accordance with a quality metric of a third reverse link channel.

25. The method as claimed in claim 23 further comprising:

time division multiplexing the determined number of chips with chips of the second reverse link channel.

26. The method as claimed in claim 24 wherein the reverse link channel comprises a reverse link indicator channel;

wherein the first reverse link channel comprises a pilot channel;

wherein the second reverse link channel comprises a traffic channel; and

wherein the third reverse link channel comprises data request channel.

27. An apparatus for controlling a reverse link channel power, the apparatus comprising:

a processor; and

a storage medium coupled the processor and containing a set of instructions executable by the processor to;

determine a transmit power of a first reverse link channel;

determine a transmit power of a second reverse link channel in accordance with the first reverse link channel;

set a transmit power of the reverse link channel equal to the transmit power of the second reverse link channel; and

determine number of chips in the reverse link channel in accordance with the transmit power of the reverse link channel.

28. The apparatus as claimed in claim 27 wherein the processor determines a transmit power of a first reverse link channel by executing a set of instructions to:

determine a transmit power of a first reverse link channel in accordance with a quality metric of a third reverse link channel.

29. The apparatus as claimed in claim 27 wherein the processor further executes a set of instructions to:

time division multiplex the determined number of chips with chips of the second reverse link channel.

30. The apparatus as claimed in claim 28 wherein the reverse link channel comprises a reverse link indicator channel;

wherein the first reverse link channel comprises a pilot channel;

wherein the second reverse link channel comprises a traffic channel; and

wherein the third reverse link channel comprises data request channel.

31. A method for controlling a reverse link channel power, the method comprising:

determining a desired quality of service for the reverse link channel; and

determining a transmit power of the reverse link channel in accordance with the desired quality of service and a number of chips allocated to the reverse link channel.

33. An apparatus for controlling a reverse link channel power, the apparatus comprising:

a processor; and

a storage medium coupled the processor and containing a set of instructions executable by the processor to;

determine a desired quality of service for the reverse link channel; and

determine a transmit power of the reverse link channel in accordance with the desired quality of service and a number of chips allocated to the reverse link channel.

34. The apparatus as claimed in claim 33 further comprising:

a receiver coupled to said processor the receiver being configured to receive the desired quality of service for the reverse link channel.

35. A method for determining a rate of data transmitted over a reverse link channel, the method comprising:

determining a transmit power of a first reverse link channel;

determining a transmit power ratio of a maximum power of the reverse link channel to the transmit power of the first reverse link channel;

adjusting the transmit power ratio in accordance with a quality metric of the reverse link channel; and

computing the rate of data as a maximum rate of data in accordance with the adjusted transmit power ratio.

36. The method as claimed in claim 35 wherein the determining a transmit power of a first reverse link channel comprises:

determining a transmit power of a first reverse link channel in accordance with a quality metric of a second reverse link channel.

37. The method as claimed in claim 35 wherein the adjusting the transmit power ratio in accordance with a quality metric of the reverse link channel comprises:

increasing the transmit power ratio by a first determined amount when a first determined number of re-transmissions of user data over the reverse link channel failed.

38. The method as claimed in claim 35 wherein the adjusting the transmit power ratio in accordance with a quality metric of the reverse link channel comprises:

decreasing the transmit power ratio by a second determined amount when user data has been successfully transmitted over the reverse link channel within a second determined number of re-transmissions.

39. The method as claimed in claim 35 wherein the adjusting the transmit power ratio in accordance with a quality metric of the reverse link channel comprises:

determining a rise over thermal differential between a transmission interval of the first reverse link channel and a transmission interval of the reverse link channel;

adjusting the rise over thermal differential; and

adjusting the transmit power ratio in accordance with the adjusted rise over thermal differential.

40. The method as claimed in claim 39 wherein the determining a rise over thermal differential between a transmission interval of the first reverse link channel and a transmission interval of the reverse link channel comprises:

measuring at an access point a rise over thermal in a transmission interval of the first reverse link channel;

measuring at the access point a rise over thermal in the transmission interval of the reverse link channel; and

computing a difference between the rise over thermal in the transmission interval of the first reverse link channel and the rise over thermal in the transmission interval of the reverse link channel.

41. The method as claimed in claim 39 wherein the determining a rise over thermal differential between a transmission interval of the first reverse link channel and the transmission interval of the reverse link channel comprises:

estimating at an access terminal the rise over thermal differential.

42. The method as claimed in claim 41 wherein the estimating at an access terminal the rise over thermal differential comprises:

estimating at an access terminal the rise over thermal differential in accordance with the quality metric of the reverse link channel.

43. The method as claimed in claim 35 wherein the reverse link channel comprises a traffic channel;

and

wherein the first reverse link channel comprises a pilot channel.

44. The method as claimed in claim 36 wherein the second reverse link channel comprises a data request channel.

45. An apparatus for determining a rate of data transmitted over a reverse link channel, the apparatus comprising:

a processor; and

a storage medium coupled the processor and containing a set of instructions executable by the processor to;

determine a transmit power of a first reverse link channel;

determine a transmit power ratio of a maximum power of the reverse link channel and the transmit power of the first reverse link channel;

adjust the transmit power ratio in accordance with a quality metric of the reverse link channel; and

compute the rate of data as a maximum rate of data in accordance with the adjusted transmit power ratio.

46. The apparatus as claimed in claim 45 wherein the processor determines a transmit power of a first reverse link channel by executing a set of instructions to:

determine a transmit power of a first reverse link channel in accordance with a quality metric of a second reverse link channel.

47. The apparatus as claimed in claim 45 wherein the processor adjusts the transmit power ratio in accordance with a quality metric of the reverse link channel by executing a set of instructions to:

increase the transmit power ratio by a first determined amount when a first determined number of re-transmissions of user data over the reverse link channel failed.

48. The apparatus as claimed in claim 45 wherein the processor adjusts the transmit power ratio in accordance with a quality metric of the reverse link channel by executing a set of instructions to:

decrease the transmit power ratio by a second determined amount when user data has been successfully transmitted over the reverse link channel within a second determined number of re-transmissions.

49. The apparatus as claimed in claim 45 wherein the processor adjusts the transmit power ratio in accordance with a quality metric of the reverse link channel by executing a set of instructions to:

determine a rise over thermal differential between a transmission interval of the first reverse link channel and a transmission interval of the reverse link channel;

adjust the rise over thermal differential; and

adjust the transmit power ratio in accordance with the adjusted rise over thermal differential.

50. The apparatus as claimed in claim 49 wherein the processor determines a rise over thermal differential between a transmission interval of the first reverse link channel and the transmission interval of the reverse link channel by executing a set of instructions to:

estimating the rise over thermal differential.

51. The apparatus as claimed in claim 50 wherein the processor estimates the rise over thermal differential by executing a set of instructions to:

estimate the rise over thermal differential in accordance with the quality metric of the reverse link channel.

52. The apparatus as claimed in claim 49 further comprising:

a second processor; and

a second storage medium coupled the second processor and containing a set of instructions executable the second processor to;

measure a rise over thermal in a transmission interval of the first reverse link channel;

measuring a rise over thermal in the transmission interval of the reverse link channel; and

computing a difference between the rise over thermal in the transmission interval of the first reverse link channel and the rise over thermal in the transmission interval of the reverse link channel.

53. The apparatus as claimed in claim 45 wherein the reverse link channel comprises a traffic channel;

and

wherein the first reverse link channel comprises a pilot channel.

54. The apparatus as claimed in claim 46 wherein the second reverse link channel comprises a data request channel.

55. The apparatus as claimed in claim 45 wherein the processor and the storage medium are disposed in an access terminal.

56. The apparatus as clains in claim 52 wherein the second processor and the

second storage medium are disposed in an access point.

57. A method for determining a rate of data transmitted over a reverse link channel, the method comprising:

determining at an access terminal a transmit power of a first reverse link channel;

determining at an access terminal maximum transmit power of the reverse link channel;

receiving at an access terminal adjusted transmit power ratio of a transmit power of the reverse link channel to a transmit power of the first reverse link channel; and

computing the rate of data as a maximum rate of data in accordance with the adjusted transmit power ratio, the determined transmit power of the first reverse link channel, and the determined maximum transmit power of the reverse link channel.

58. The method as claimed in claim 57 wherein the determining a transmit power of a first reverse link channel comprises:

determining a transmit power of a first reverse link channel in accordance with a quality metric of a second reverse link channel.

59. The method as claimed in claim 57 further comprising:

determining at an access point the transmit power ratio of a transmit power of the reverse link channel to a transmit power of the first reverse link channel;

determining at the access point a rise over thermal differential between a transmission interval of the first reverse link channel and a transmission interval of the reverse link channel; and

adjusting the maximum transmit power ratio in accordance with the rise over thermal differential.

60. The method as claimed in claim 59 wherein the determining at the access point a rise over thermal differential between a transmission interval of the first reverse link channel and a transmission interval of the reverse link channel comprises:

measuring a rise over thermal in a transmission interval of the first reverse link channel;

measuring a rise over thermal in the transmission interval of the reverse link channel; and

computing a difference between the rise over thermal in the transmission interval of the first reverse link channel and the rise over thermal in the transmission interval of the reverse link channel.

61. An apparatus for determining a rate of data transmitted over a reverse link channel, the apparatus comprising:

a processor; and

a storage medium coupled the second processor and containing a set of instructions executable by the processor to;

determine a transmit power of a first reverse link channel;

determine maximum transmit power of the reverse link channel;

receive adjusted transmit power ratio of a transmit power of the reverse link channel to a transmit power of the first reverse link channel; and

compute the rate of data as a maximum rate of data in accordance with the adjusted transmit power ratio, the determined transmit power of the first reverse link channel, and the determined maximum transmit power of the reverse link channel.

62. The apparatus as claimed in claim 61 wherein the processor determines a transmit power of a first reverse link channel by executing a set of instructions to:

determine a transmit power of a first reverse link channel in accordance with a quality metric of a second reverse link channel.

63. The apparatus as claimed in claim 61 further comprising:

a second processor; and

a second storage medium coupled the second processor and containing a set of instructions executable the second processor to;

determine the transmit power ratio of a transmit power of the reverse link channel to a transmit power of the first reverse link channel;

determine a rise over thermal differential between a transmission interval of the first reverse link channel and a transmission interval of the reverse link channel; and

adjust the maximum transmit power ratio in accordance with the rise over thermal differential.

64. The apparatus as claimed in claim 63 wherein the second processor determines a rise over thermal differential between a transmission interval of the first reverse link channel and a transmission interval of the reverse link channel by executing a a set of instructions to:

measure a rise over thermal in a transmission interval of the first reverse link channel;

measure a rise over thermal in the transmission interval of the reverse link channel; and

compute a difference between the rise over thermal in the transmission interval of the first reverse link channel and the rise over thermal in the transmission interval of the reverse link channel.

65. The apparatus as claimed in claim 61 wherein the reverse link channel comprises a traffic channel;

and

wherein the first reverse link channel comprises a pilot channel.

66. The apparatus as claimed in claim 61 wherein the second reverse link channel comprises a data request channel.

67. The apparatus as claimed in claim 61 wherein the processor and the storage medium are disposed in an access terminal.

68. The apparatus as claimed in claim 63 wherein the second processor and the second storage medium are disposed in an access point.