Method and apparatus for controlling forward direction power ratio in W-CDMA wireless communication base station

• US 6,785,247 B1
• Filed: 03/21/2000
• Issued: 08/31/2004
• Est. Priority Date: 06/21/1999
• Status: Expired due to Term

• Current Assignee: LG Information & Communications Ltd. (LG Corporation)
• Original Assignee: LG Information & Communications Ltd. (LG Corporation)
• Inventors: Lee, Jang-ho
• Primary Examiner(s): Ngo, Ricky
• Assistant Examiner(s): MEW, KEVIN D
• Application Number:
  US09/532,044
• Time in Patent Office: 1,624 Days
• Field of Search: 370/311, 370/329, 370/330, 370/335, 370/342, 370/441, 370/252, 370/468
• US Class Current: 370/311
• CPC Class Codes: H04W 52/143 Downlink 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 52/32 TPC of broadcast or control channels
• CPC Class Codes: H04W 52/343 taking into account loading or congestion level
• CPC Class Codes: H04W 52/346 distributing total power among users or channels

Abstract

A method and apparatus for controlling a forward direction power ratio in a W-CDMA wireless base station including the steps of: recognizing a variation in number of traffic channels; recognizing a data transfer speed; computing a power ratio of each channel according to the number of traffic channels and the data transfer speed; and re-adjusting an existing power ratio according to the computed power ratio of each channel.

Claims

1. A method for controlling forward direction power in a W-CDMA wireless communication system, comprising:

recognizing a number of currently connected individual traffic channels;

recognizing a transfer speed; and

adjusting a power value of one or more of a plurality of channels to constantly maintain a power ratio among the channels.

2. A method for controlling a forward direction power ratio of a plurality of channels in a W-CDMA wireless base station, comprising:

recognizing a variation in a number of individual traffic channels of a traffic channel;

recognizing a data transfer speed of the traffic channel;

determining power values for the plurality of channels according to the number of individual traffic channels and the data transfer speed; and

re-adjusting existing power of the plurality of channels to match the determined power values, wherein the re-adjusting step includes maintaining a desired power ratio among the plurality of channels irrespective of the variation in the number of individual traffic channels.

3. The method according to claim 2, wherein a pilot channel power is 20% of a total forward direction power.

4. The method according to claim 3, wherein the sum of a synchronization channel power, a paging channel power, a traffic channel power and a signal channel power is 80% of a total forward direction power.

5. The method according to claim 2, wherein a traffic channel power is determined by multiplying a power of an individual traffic channel by the number of individual traffic channels.

6. The method according to claim 4, wherein the paging channel power is determined by doubling a value obtained by multiplying the traffic channel power by the number of individuals traffic channels.

7. The method according to claim 4, wherein the synchronization channel power is determined by multiplying the traffic channel power by the number of individual traffic channels and dividing by 2.

8. The method according to claim 4, wherein the signal channel power is variably set in proportion to the data transfer speed of the traffic channel.

9. The method according to claim 8, wherein when the data transfer speed is 32 Kbps, the traffic channel power is approximately 7.26 times the signal channel power.

10. The method according to claim 8, wherein when the data transfer speed is 64 Kbps, the traffic channel power is approximately 14.52 times the signal channel power.

11. The method according to claim 3, wherein the traffic channel power is determined by multiplying the power of an individual traffic channel by the number of individual traffic channels,

a paging channel power is determined by doubling the value obtained by multiplying the traffic channel power by the number of individuals traffic channels,

a synchronization channel power is determined by multiplying the traffic channel power by the number of individual traffic channels and dividing by 2, and

a signal channel power is variably set in proportion to the data transfer speed of the traffic channel.

12. The method according to claim 11, wherein a pilot channel power is 20% of a total forward direction power, and the sum of the synchronization channel power, the paging channel power, the traffic channel power and the signal channel power is 80% of the total forward direction power.

13. A W-CDMA wireless communication base station that controls the forward direction power ratio according to the method of claim 12.

14. A W-CDMA wireless communication base station that controls the forward direction power ratio according to the method of claim 2.

15. A method for controlling power in a W-CDMA communications system, comprising:

connecting a mobile terminal and a base station; and

maintaining a constant power ratio for a predetermined number of channels between the mobile terminal and base station as a number of traffic channels connected to the base station changes.

16. The method of claim 15, wherein said constant power ratio is defined by a predetermined communications standard.

17. The method of claim 16, wherein the communications standard is IS-97-A.

18. The method of claim 15, wherein said constant power ratio includes 20% power allotted to the pilot channel and 80% power allotted to remaining ones of said channels.

19. The method of claim 15, wherein a sum of the first and second fixed values equals a total power allotted for communicating signals between the mobile terminal and base station.

20. The method of claim 15, wherein the adjusting step includes:

determining a number of traffic channels currently connected to the base station;

determining a kind of service corresponding to the traffic channel between the mobile terminal and base station; and

computing power values for said at least two of the paging channel, synchronization channel, traffic channel, and signal channel based on the number of traffic channels and kind of service determined in the determining steps, said power values being computed so that a sum of the power values maintains the second fixed value.

21. The method of claim 20, wherein the kind of service is determined based on data transfer speed information.

22. The method of claim 20, wherein the computing step includes:

determining a correction value for a power of the signal channel based on the kind of data service and computing the power value for the signal channel and the traffic channel based on the correction value.

23. A system for controlling power in a W-CDMA communications system, comprising:

a detector which detects a number of traffic channels connected to a base station; and

a processor which maintains a constant power ratio for a predetermined number of channels between a mobile terminal and the base station as a number of traffic channels connected to the base station changes.

24. The system of claim 23, wherein said constant power ratio is defined by a predetermined communications standard.

25. The system of claim 24, wherein the communications standard is IS-97-A.

26. The system of claim 23, wherein said constant power ratio includes 20% power allotted to the pilot channel and 80% power allotted to remaining ones of said channels.

27. The system of claim 23, wherein a sum of the first and second fixed values equals a total power allotted for communicating signals between the mobile terminal and base station.

28. The system of claim 23, wherein the processor determines a kind of service corresponding to the traffic channel between the mobile terminal and base station and computes power values for said at least two of the paging channel, synchronization channel, traffic channel, and signal channel based on the number of traffic channels and the kind of service, said power values being computed so that a sum of the power values maintains the second fixed value.

29. The system of claim 28, wherein the kind of service is determined based on data transfer speed information.

30. The system of claim 28, wherein the processor determines a correction value for a power of the signal channel based on the kind of data service and computes the power value for the signal channel and the traffic channel based on the correction value.