Forward link power control of multiple data streams transmitted to a mobile station using a common power control channel

• US 6,249,683 B1
• Filed: 04/08/1999
• Issued: 06/19/2001
• Est. Priority Date: 04/08/1999
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Lundby, Stein A., Razoumov, Leonid
• Primary Examiner(s): Maung, Nay
• Assistant Examiner(s): Trinh, Sonny
• Application Number:
  US09/288,262
• Time in Patent Office: 803 Days
• Field of Search: 455/522, 455/13.4, 455/69, 455/115, 455/127, 455/70, 455/68, 455/126, 455/343, 455/574, 455/561, 455/550, 455/38.3, 455/419, 370/318, 370/342, 370/441, 370/252
• US Class Current: 455/522
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 52/20 using error rate
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/248 where transmission power control commands are generated based on a path parameter
• CPC Class Codes: H04W 52/40 during macro-diversity or soft handoff
• CPC Class Codes: H04W 52/54 Signalisation aspects of the TPC commands, e.g. frame structure
• CPC Class Codes: H04W 52/58 Format of the TPC bits
• CPC Class Codes: H04W 52/60 using different transmission rates for TPC commands

Abstract

A method and apparatus for controlling transmit power levels of a plurality of different data streams transmitted from at least one base station to a mobile station in a mobile radio communication system. The first and second data streams are transmitted from the base station and received at the mobile station. A stream of power control commands is formed at the mobile station in accordance with either the first or second received data stream. A power control signal is formed at the mobile station from the first stream of power control commands and transmitted to the base station. A received stream of power control commands is formed from the received power control signal at the base station, and the transmit power levels of the first and second data streams from the base station are controlled in accordance with the received stream of power control commands. Additional streams of power control commands can also be generated at the mobile station where one or both of the first and second data streams are simultaneously transmitted to the mobile station from further base stations, and these additional streams of power control commands can be interleaved to form an interleaved power control signal that is sent to all the base stations transmitting the first and second data streams to the mobile station and used for controlling the transmit power of the first and second data streams from such base stations.

Claims

1. In a mobile radio telephone communication system, a method for controlling transmit power levels of a plurality of different data streams transmitted from at least one base station to a mobile station, comprising the steps of:

(a) transmitting a first data stream from the at least one base station to the mobile station, and transmitting a second data stream from the at least one base station to the mobile station;

(b) receiving the first and second data streams at the mobile station;

(c) forming a first stream of power control commands at the mobile station in accordance with either the first or second received data stream;

(d) forming a power control signal at the mobile station from the first stream of power control commands;

(e) transmitting the power control signal from the mobile station to the at least one base station;

(f) receiving the power control signal at the at least one base station;

(g) forming a first received stream of power control commands from the received power control signal at the at least one base station; and

(h) controlling a transmit power level of the first data stream from the at least base station in accordance with the first received stream of power control commands, and controlling a transmit power level of the second data stream from the at least one base station in accordance with the first received stream of power control commands.

2. The method of claim 1, wherein the radio telephone communication system includes first and second base stations, and step (a) comprises:

(a) transmitting the first data stream from the first and second base stations to the mobile station, and transmitting the second data stream from the second base station to the mobile station;

step (b) comprises;

(b) receiving, at the mobile station, the first data stream from the first base station and from the second base station, and receiving the second data stream from the second base station at the mobile station;

step (c) comprises;

(c) forming a first stream of power control commands at the mobile station, wherein the first stream of power control commands is determined in accordance with one of the first or second data streams received from the first base station, and forming a second stream of power control commands at the mobile station, wherein the second stream of power control commands is determined in accordance with the second data stream received from the second base station;

step (d) comprises;

(d) forming an interleaved power control signal at the mobile station by interleaving the first and second streams of power control commands;

step (e) comprises;

(e) transmitting the interleaved power control signal from the mobile station to the first and second base stations;

step (f) comprises;

(f) receiving the interleaved power control signal at the first and second base station;

step (g) comprises;

(g) forming a first received stream of power control commands at the first base by deinterleaving the received interleaved power control signal, and forming a second received stream of power control commands at the second base station by deinterleaving the received interleaved power control signal; and

step (h) comprises;

(h) controlling the transmit power level of the first data stream transmitted from the first base station in accordance with the first received stream of power control commands, controlling the transmit power level of the second data stream transmitted from the first base station in accordance with the first received stream of power control commands, controlling a transmit power level of the second data stream transmitted from the second base station in accordance with the second received stream of power control commands.

3. The method of claim 1, wherein the radio telephone communication system includes first and second base stations, and step (a) comprises:

(a) transmitting the first data stream from the first and second base stations to the mobile station, and transmitting the second data stream from the first and second base stations to the mobile station;

step (b) comprises;

(b) receiving, at the mobile station, the first data stream from the first base station and from the second base station, and receiving, at the mobile station, the second data stream from the first base station and from the second base station;

step (c) comprises;

(c) forming a first stream of power control commands at the mobile station, wherein the first stream of power control commands is determined in accordance with one of the first or second data streams received from the first base station, and forming a second stream of power control commands at the mobile station, wherein the second stream of power control commands is determined in accordance with one of the first or second data streams received from the second base station;

step (d) comprises;

(d) forming an interleaved power control signal at the mobile station by interleaving the first and second streams of power control commands;

step (e) comprises;

(e) transmitting the interleaved power control signal from the mobile station to the first and second base stations;

step (f) comprises;

(f) receiving the interleaved power control signal at the first and second base station;

step (g) comprises;

(g) forming a first received stream of power control commands at the first base by deinterleaving the received interleaved power control signal, and forming a second received stream of power control commands at the second base station by deinterleaving the received interleaved power control signal; and

step (h) comprises;

(h) controlling the transmit power level of the first data stream transmitted from the first base station in accordance with the first received stream of power control commands, controlling the transmit power level of the second data stream transmitted from the first base station in accordance with the first received stream of power control commands, controlling the transmit power level of the first data stream transmitted from the second base station in accordance with the second received stream of power control commands, and controlling the transmit power level of the second data stream transmitted from the second base station in accordance with the second received stream of power control commands.

4. The method of claim 3, wherein the first received stream of power control commands corresponds substantially to the first stream of power control commands determined in step (c).

5. The method of claim 4, wherein the second received stream of power control commands corresponds substantially to the second stream of power control commands determined in step (c).

6. The method of claim 1, wherein the radio telephone communication system includes a first set of two or more bases stations, and the first set of base stations includes at least first and second base stations, and step (a) comprises:

(a) transmitting the first data stream from each base station in the first set of base stations to the mobile station, and transmitting the second data stream from the second base station to the mobile station;

step (b) comprises;

(b) receiving the first data stream from each base station in the first set of base stations at the mobile station, and receiving the second data stream from the second base station at the mobile station;

step (c) comprises;

(c) forming a first plurality of streams of power control commands at the mobile station, wherein each stream of power control commands in the first plurality of streams of power control commands is associated with one of the base stations in the first set of base stations, wherein each stream of power control commands in the first plurality other than the power control stream associated with the second base station is determined in accordance with the first data stream received from one of the base stations in the first set of base stations, and wherein the stream of power control commands in the first plurality associated with the second base station is determined in accordance with one of the first or second data streams received from the second base station;

step (d) comprises;

(d) forming an interleaved power control signal at the mobile station by interleaving the first plurality of streams of power control commands;

step (e) comprises;

(e) transmitting the interleaved power control signal from the mobile station to the base stations in the first set of base stations;

step (f) comprises;

(f) receiving the interleaved power control signal at the base stations in the first set of base stations;

step (g) comprises;

(g) forming a first plurality of received streams of power control commands, wherein each of the received streams of power control commands in the first plurality is formed at a different one of the base stations in the first set of base stations by deinterleaving the received interleaved power control signal, and the first plurality includes a received stream of power control commands associated with the second base station; and

step (h) comprises;

(h) controlling the transmit power level of the first data stream transmitted from each base station in the first set of base stations other than the second base station in accordance with a corresponding one of the first plurality of received streams of power control commands, and controlling the transmit power level of the first and second data streams transmitted from the second base station in accordance with the received stream of power control commands associated with the second base station.

7. The method of claim 1, wherein the first data stream is a voice message signal.

8. The method of claim 7, wherein the second data stream represents a fax transmission.

9. The method of claim 7, wherein the second data stream represents an internet transmission.

10. The method of claim 1, wherein the mobile station forms the first stream of power control commands in step (c) by monitoring an error rate associated with either the first or second received data stream.

11. The method of claim 1, wherein the mobile station forms the first stream of power control commands in step (c) by monitoring a signal-to-noise ratio associated with either the first or second received data stream.

12. The method of claim 1, wherein each of the power control commands in the first stream of power control commands represents a command to either increase or decrease transmit power associated with the first or second data streams transmitted in step (a).

13. The method of claim 1, wherein the first and second data streams are transmitted to the mobile station in step (a) on a common frequency band.

14. The method of claim 13, wherein the first and second data streams are transmitted to the mobile station using code division multiple access modulation.

15. The method of claim 2, wherein the first stream of power control commands has a first bit rate within the interleaved power control signal and the second stream of power control commands has a second bit rate within the interleaved power control signal.

16. The method of claim 3, wherein the first stream of power control commands has a first bit rate within the interleaved power control signal and the second stream of power control commands has a second bit rate within the interleaved power control signal.

17. The method of claim 2, wherein the mobile station is in a soft handoff between the first and second base stations while steps (a)-(h) are being performed.

18. The method of claim 3, wherein the mobile station is in a soft handoff between the first and second base stations while steps (a)-(h) are being performed.

19. In a mobile radio telephone communication system, a method for controlling transmit power levels of a plurality of different data streams transmitted from at least one base station to a mobile station, comprising the steps of:

(a) transmitting a first data stream from the at least one base station to the mobile station, and transmitting a second data stream from the at least one base station to the mobile station;

(b) receiving the first and second data streams at the mobile station;

(c) forming a first stream of power control commands at the mobile station in accordance with the first received data stream, and forming a second stream of power control commands at mobile station in accordance with the second received data stream;

(d) forming a power control signal at the mobile station by interleaving the first and second streams of power control commands;

(e) transmitting the interleaved power control signal from the mobile station to the at least one base station;

(f) receiving the interleaved power control signal at the at least one base station;

(g) forming first and second received streams of power control commands by deinterleaving the received power control signal at the at least one base station; and

(h) controlling a transmit power level of the first data stream from the at least base station in accordance with the first received stream of power control commands, and controlling a transmit power level of the second data stream from the at least one base station in accordance with the second received stream of power control commands.

20. The method of claim 19, wherein the radio telephone communication system includes first and second base stations, and step (a) comprises:

(a) transmitting the first data stream from the first and second base stations to the mobile station, and transmitting the second data stream from the second base station to the mobile station;

step (b) comprises;

(b) receiving, at the mobile station, the first data stream from the first base station and from the second base station, and receiving the second data stream from the second base station at the mobile station;

step (c) comprises;

(c) forming first and second streams of power control commands at the mobile station, wherein the first stream of power control commands is determined in accordance with the first data stream received from the first base station and the second stream of power control commands is determined in accordance with the first data stream received from the second base station, and forming a third stream of power control commands at the mobile station, wherein the third stream of power control commands is determined in accordance with the second data stream received from the second base station;

step (d) comprises;

(d) forming an interleaved power control signal at the mobile station by interleaving the first, second and third streams of power control commands;

step (e) comprises;

(e) transmitting the interleaved power control signal from the mobile station to the first and second base stations;

step (f) comprises;

(f) receiving the interleaved power control signal at the first and second base station;

step (g) comprises;

(g) forming first and second received streams of power control commands at the first base by deinterleaving the received interleaved power control signal, and forming a third received stream of power control commands at the second base station by deinterleaving the received interleaved power control signal; and

step (h) comprises;

(h) controlling the transmit power level of the first data stream transmitted from the first base station in accordance with the first received stream of power control commands, controlling the transmit power level of the second data stream transmitted from the first base station in accordance with the second received stream of power control commands, controlling a transmit power level of the second data stream transmitted from the second base station in accordance with the third received stream of power control commands.

21. The method of claim 19, wherein the radio telephone communication system includes first and second base stations, and step (a) comprises:

(a) transmitting the first data stream from the first and second base stations to the mobile station, and transmitting the second data stream from the first and second base stations to the mobile station;

step (b) comprises;

(b) receiving, at the mobile station, the first data stream from the first base station and from the second base station, and receiving, at the mobile station, the second data stream from the first base station and from the second base station;

step (c) comprises;

(c) forming first and second streams of power control commands at the mobile station, wherein the first stream of power control commands is determined in accordance with the first data stream received from the first base station and the second stream of power control commands is determined in accordance with the first data stream received from the second base station, and forming third and fourth streams of power control commands at the mobile station, wherein the third stream of power control commands is determined in accordance with the second data stream received from the first base station and the fourth stream of power control commands is determined in accordance with the second data stream received from the second base station;

step (d) comprises;

(d) forming an interleaved power control signal at the mobile station by interleaving the first, second, third and fourth streams of power control commands;

step (e) comprises;

(e) transmitting the interleaved power control signal from the mobile station to the first and second base stations;

step (f) comprises;

(f) receiving the interleaved power control signal at the first and second base station;

step (g) comprises;

(g) forming first and second received streams of power control commands at the first base by deinterleaving the received interleaved power control signal, and forming third and fourth received streams of power control commands at the second base station by deinterleaving the received interleaved power control signal; and

step (h) comprises;

(h) controlling the transmit power level of the first data stream transmitted from the first base station in accordance with the first received stream of power control commands, controlling the transmit power level of the second data stream transmitted from the first base station in accordance with the second received stream of power control commands, controlling the transmit power level of the first data stream transmitted from the second base station in accordance with the third received stream of power control commands, and controlling the transmit power level of the second data stream transmitted from the second base station in accordance with the fourth received stream of power control commands.

22. The method of claim 19, wherein the radio telephone communication system includes a first set of two or more bases stations, and the first set of base stations includes at least first and second base stations, and step (a) comprises:

(a) transmitting the first data stream from each base station in the first set of base stations to the mobile station, and transmitting the second data stream from the second base station to the mobile station;

step (b) comprises;

(b) receiving the first data stream from each base station in the first set of base stations at the mobile station, and receiving the second data stream from the second base station at the mobile station;

step (c) comprises;

(c) forming a first plurality of streams of power control commands at the mobile station, wherein each stream of power control commands in the first plurality is determined in accordance with the first data stream received from one of the base stations in the first set of base stations, and forming a further stream of power control commands at the mobile station, wherein the further stream of power control commands is determined in accordance with the second data stream received from the second base station;

step (d) comprises;

(d) forming an interleaved power control signal at the mobile station by interleaving the first plurality of streams of power control commands and the further stream of power control commands;

step (e) comprises;

(e) transmitting the interleaved power control signal from the mobile station to the base stations in the first set of base stations;

step (f) comprises;

(f) receiving the interleaved power control signal at the base stations in the first set of base stations;

step (g) comprises;

(g) forming a first plurality of received streams of power control commands, wherein each of the received streams of power control commands in the first plurality is formed at a different one of the base stations in the first set of base stations by deinterleaving the received interleaved power control signal, and forming a further received stream of power control commands, wherein the further received stream of power control commands is formed at the second base station by deinterleaving the received interleaved power control signal; and

step (h) comprises;

(h) controlling the transmit power level of the first data stream transmitted from each base station in the first set of base stations in accordance with a corresponding one of the first plurality of received streams of power control commands, and controlling the transmit power level of the second data stream transmitted from the second base station in accordance with the further received stream of power control commands.

23. The method of claim 22, wherein the radio telephone communication system includes a second set of two or more bases stations, and the second set of base stations is a subset of the first set of base stations, and step (a) comprises:

(a) transmitting the first data stream from the first set of base stations to the mobile station, and transmitting the second data stream from the second set of base stations to the mobile station;

step (b) comprises;

(b) receiving the first data stream from each base station in the first set of base stations at the mobile station, and receiving the second data stream from each base station in the second set of base stations at the mobile station;

step (c) comprises;

(c) forming a first plurality of streams of power control commands at the mobile station, wherein each stream of power control commands in the first plurality is determined in accordance with the first data stream received from one of the base stations in the first set of base stations, and forming a second plurality of streams of power control commands at the mobile station, wherein each stream of power control commands in the second plurality is determined in accordance with the second data stream received from one of the base stations in the second set of base stations;

step (d) comprises;

(d) forming an interleaved power control signal at the mobile station by interleaving the first plurality of streams of power control commands and the second plurality of streams of power control commands;

step (e) comprises;

(e) transmitting the interleaved power control signal from the mobile station to the base stations in the first set of base stations;

step (f) comprises;

(f) receiving the interleaved power control signal at the base stations in the first set of base stations;

step (g) comprises;

(g) forming a first plurality of received streams of power control commands, wherein each of the received streams of power control commands in the first plurality is formed at a different one of the base stations in the first set of base stations by deinterleaving the received interleaved power control signal, and forming a second plurality of received streams of power control commands, wherein each of the received streams of power control commands in the second plurality is formed at a different one of the base stations in the second set of base stations by deinterleaving the received interleaved power control signal; and

step (h) comprises;

(h) controlling the transmit power level of the first data stream transmitted from each base station in the first set of base stations in accordance with a corresponding one of the first plurality of received streams of power control commands, and controlling the transmit power level of the second data stream transmitted from each base station in the second set of base stations in accordance with a corresponding one of the second plurality of received streams of power control commands.

24. In a mobile radio telephone communication system, a method for controlling transmit power levels of a plurality of different data streams transmitted from at least first and second base stations to a mobile station, comprising the steps of:

(a) transmitting a first data stream from the first and second base stations to the mobile station, and transmitting a second data stream from the first base station to the mobile station;

(b) receiving, at the mobile station, the first data stream from the first base station and from the second base station, and receiving the second data stream from the first base station at the mobile station;

(c) forming a first stream of power control commands at the mobile station, wherein the first stream of power control commands is determined in accordance with the first data stream received from the first base station and the first data stream received from the second base station, and forming a second stream of power control commands at the mobile station, wherein the second stream of power control commands is determined in accordance with the second data stream received from the first base station;

(d) forming a power control signal at the mobile station from the first stream of power control commands and the second stream of power control commands;

(e) transmitting the power control signal from the mobile station to the first base station;

(f) receiving the power control signal at the first base station;

(g) forming a first received stream of power control commands and a second received stream of power control commands from the received power control signal at the first base station; and

(h) controlling a transmit power level of the first data stream from the first base station in accordance with the first received stream of power control commands, and controlling a transmit power level of the second data stream from the first base station in accordance with the second received stream of power control commands.

25. The method of claim 24, wherein the first received stream of power control commands corresponds substantially to the first stream of power control commands determined in step (c), and the second received stream of power control commands corresponds substantially to the second stream of power control commands determined in step (c).

26. The method of claim 24, wherein step (c) further comprises forming a third stream of power control commands at the mobile station that is different from the first stream of power control commands, the third stream of power control commands being determined in accordance with the first data stream received from the first base station and the first data stream received from the second base station;

step (d) further comprises forming a second power control signal at the mobile station from the first stream of power control commands, the second stream of power control commands and the third stream of power control commands;

step (e) further comprises transmitting the power control signal from the mobile station to the second base station;

step (f) further comprises receiving the power control signal at the second base station;

step (g) further comprises forming a third received stream of power control commands from the received power control signal at the second base station; and

step (h) further comprises controlling a transmit power level of the first data stream from the second base station in accordance with the third received stream of power control commands.

27. The method of claim 24, wherein step (a) comprises:

(a) transmitting a first data stream from a first active set of three or more base stations to the mobile station, and transmitting a second data stream from a second active set of one or more base stations to the mobile station, wherein the first and second base stations are both included in the first active set of base stations, and the first base station is included in the second active set of base stations;

step (b) comprises;

(b) receiving, at the mobile station, the first data stream from each base station in the first active set of base stations, and receiving the second data stream from each base station in the second set of base stations at the mobile station; and

step (c) comprises;

(c) forming a first stream of power control commands at the mobile station, wherein the first stream of power control commands is determined in accordance with the first data stream received from each base station in the first active set of base stations, and forming a second stream of power control commands at the mobile station, wherein the second stream of power control commands is determined in accordance with the second data stream received from the second active set of base stations.

28. The method of claim 27, wherein the second active set of base stations is a subset of the first active set of base stations.

29. The method of claim 24, wherein the first data stream is a voice message signal.

30. The method of claim 29, wherein the second data stream represents a fax transmission.

31. The method of claim 29, wherein the second data stream represents an internet transmission.

32. The method of claim 24, wherein the mobile station forms the first stream of power control commands in step (c) by monitoring an error rate associated with the first received data stream from the first base station and an error rate associated with the first received data stream from the second base station.

33. The method of claim 24, wherein the mobile station forms the first stream of power control commands in step (c) by monitoring an error rate associated with the first received data stream from the first base station and an error rate associated with the first received data stream from the second base station.

34. The method of claim 24, wherein the mobile station forms the first stream of power control commands in step (c) by monitoring a signalto-noise ratio associated with the first received data stream from the first base station and a signal-to-noise ratio associated with the first received data stream from the second base station.

35. The method of claim 24, wherein each of the power control commands in the first stream of power control commands represents a command to either increase or decrease transmit power associated with the first data stream transmitted from the first base station in step (a).

36. The method of claim 35, wherein each of the power control commands in the second stream of power control commands represents a command to either increase or decrease transmit power associated with the second data stream transmitted from the first base station in step (a).

37. The method of claim 26, wherein each of the power control commands in the third stream of power control commands represents a command to either increase or decrease transmit power associated with the first data stream transmitted from the second base station in step (a).

38. The method of claim 24, wherein the first and second data streams are transmitted to the mobile station in step (a) on a common frequency band.

39. The method of claim 38, wherein the first and second data streams are transmitted to the mobile station using code division multiple access modulation.

40. The method of claim 24, wherein the mobile station is in a soft handoff between the first and second base stations while steps (a)-(h) are being performed.

41. The method of claim 26, wherein the mobile station is in a soft handoff between the first and second base stations while steps (a)-(h) are being performed.

42. The method of claim 27, wherein the mobile station is in a soft handoff between the first and second base stations while steps (a)-(h) are being performed.

43. In a mobile radio telephone communication system, a method for controlling transmit power levels of a plurality of different data streams transmitted from at least first and second base stations to a mobile station, comprising the steps of:

(a) transmitting a first data stream from the first and second base stations to the mobile station, and transmitting a second data stream from the first base station to the mobile station;

(b) receiving, at the mobile station, the first data stream from the first base station and from the second base station, and receiving the second data stream from the first base station at the mobile station;

(c) forming a first stream of power control commands at the mobile station, wherein the first stream of power control commands is determined in accordance with the first data stream received from the first base station and the first data stream received from the second base station, and forming a second stream of power control commands at the mobile station, wherein the second stream of power control commands is determined in accordance with the second data stream received from the first base station;

(d) forming a power control signal at the mobile station from the first stream of power control commands and the second stream of power control commands;

(e) transmitting the power control signal from the mobile station to the first base station and the second base station;

(f) receiving the power control signal at the first base station and the second base station;

(g) forming a first received stream of power control commands at the first base station and a second received stream of power control commands from the received power control signal at the second base station; and

(h) controlling a transmit power level of the first data stream from the first base station in accordance with the first received stream of power control commands, controlling a transmit power level of the second data stream from the first base station in accordance with the first received stream of power control commands, and controlling a transmit power level of the first data stream from the second base station in accordance with the second received stream of power control commands.

44. The method of claim 43, wherein the second received stream of power control commands corresponds substantially to the first stream of power control commands determined in step (c), and the first received stream of power control commands corresponds substantially to the second stream of power control commands determined in step (c).

45. The method of claim 43, wherein the first data stream is a voice message signal.

46. The method of claim 45, wherein the second data stream represents a fax transmission.

47. The method of claim 45, wherein the second data stream represents an internet transmission.

48. The method of claim 43, wherein the mobile station forms the first stream of power control commands in step (c) by monitoring an error rate associated with the first received data stream from the first base station and an error rate associated with the first received data stream from the second base station.

49. The method of claim 43, wherein the mobile station forms the first stream of power control commands in step (c) by monitoring an error rate associated with the first received data stream from the first base station and an error rate associated with the first received data stream from the second base station.

50. The method of claim 43, wherein the mobile station forms the first stream of power control commands in step (c) by monitoring a signal-to-noise ratio associated with the first received data stream from the first base station and a signal-to-noise ratio associated with the first received data stream from the second base station.

51. The method of claim 43, wherein each of the power control commands in the first stream of power control commands represents a command to either increase or decrease transmit power associated with the first data stream transmitted from the second base station in step (a).

52. The method of claim 51, wherein each of the power control commands in the second stream of power control commands represents a command to either increase or decrease transmit power associated with the first data stream transmitted from the first base station in step (a).

53. The method of claim 52, wherein each of the power control commands in the second stream of power control commands represents a command to either increase or decrease transmit power associated with the second data stream transmitted from the first base station in step (a).

54. The method of claim 43, wherein the first and second data streams are transmitted to the mobile station in step (a) on a common frequency band.

55. The method of claim 54, wherein the first and second data streams are transmitted to the mobile station using code division multiple access modulation.

56. The method of claim 43, wherein the mobile station is in a soft handoff between the first and second base stations while steps (a)-(h) are being performed.

57. In a mobile radio telephone communication system, a method for controlling transmit power levels of a first data stream transmitted to a mobile station from one or more base stations in a first active set of base stations and the transmit power levels of a second data stream transmitted from one or more base stations in a second set of active base stations to the mobile station, comprising the steps of:

(a) transmitting the first data stream from the first active set of base stations to the mobile station, and transmitting the second data stream from the second active set of base stations to the mobile station;

(b) receiving, at the mobile station, the first data stream from the first active set of base stations, and receiving the second data stream from the second active set of base stations at the mobile station;

(c) forming a first stream of power control commands at the mobile station, wherein the first stream of power control commands is determined in accordance with the first data stream received from each base station in the second active set of base stations and the second data stream received from each base station in the second active set of base stations, and forming a second stream of power control commands at the mobile station, wherein the second stream of power control commands is determined in accordance with the first data stream received from each base station in the first active set of base stations and not in the second set of active base stations;

(d) forming a power control signal at the mobile station from the first stream of power control commands and the second stream of power control commands;

(e) transmitting the power control signal from the mobile station to the first and second active sets of base stations;

(f) receiving the power control signal at a first base station, wherein the first base station is in the first active set and the second active set of base stations;

(g) forming a first received stream of power control commands at the first base station in accordance with the received power control signal, wherein the first received stream of power control commands corresponds to the first stream of power control commands formed at the mobile station;

(h) controlling a transmit power level of the first data stream from the first base station in accordance with the first received stream of power control commands, and controlling a transmit power level of the second data stream from the first base station in accordance with the first received stream of power control commands;

(j) receiving the power control signal at a second base station, wherein the second base station is in the first active set of base stations and not in the second active set of base stations;

(j) forming a second received stream of power control commands at the second base station in accordance with the received power control signal, wherein the second received stream of power control commands corresponds to the second stream of power control commands formed at the mobile station; and

(k) controlling a transmit power level of the first data stream from the second base station in accordance with the second received stream of power control commands.