Methods and apparatus for allocation of power to base station channels

• US 6,678,257 B1
• Filed: 09/25/2000
• Issued: 01/13/2004
• Est. Priority Date: 09/25/2000
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Black, Peter J., Vijayan, Rajiv, Esteves, Eduardo A. S.
• Primary Examiner(s): Pham, Chi
• Assistant Examiner(s): JONES, PRENELL P
• Application Number:
  US09/669,950
• Time in Patent Office: 1,205 Days
• Field of Search: 370/320, 370/331-342, 370/468, 370/318, 370/200-205, 370/254, 370/311, 370/347, 455/13.4, 455/437, 455/522, 455/450, 455/115.1, 455/69, 126/450-455, 134/522, 509/422-435, 509/440, 375/130-145, 375/146, 375/227, 375/222, 375/225, 437/562, 451/561, 451/517, 451/63-69, 714/710, 700/95
• US Class Current: 370/320
• CPC Class Codes: H04W 52/32 TPC of broadcast or control channels
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels
• CPC Class Codes: H04W 52/34 TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading

Abstract

A method and apparatus that determines how much power to allocate to each of a plurality of reverse link power control (RLPC) Channels to be transmitted from a base station, based upon data rate control (DRC) messages transmitted to the base station. The DRC messages transmitted to the base station are used to determine the quality of the Forward Link over which the RLPC is to be transmitted. Even though the remote station to which the RLPC Channel is to be directed has not transmitted a DRC, the base station is capable of allocating power to the RLPC Channel based upon information provided to the base station in DRCs that were received by the base station. Accordingly, the base station can allocate power among the RLPC Channels without having received explicit information as to the quality of the Forward Link between the base station and every remote station intended to receive the information on the RLPC Channels.

Claims

1. A method, comprising:

receiving data rate control information from a plurality of stations in a communications system, the data rate control information indicating the data rate at which power control information is to be transmitted by a first station to the plurality of stations;

adjusting the data rate control information from each station of the plurality of stations based upon a destination sector of the data rate control information; and

determining from the adjusted data rate control information the amount of power required to transmit the power control information from the first station to the plurality of stations.

3. The method of claim 1, wherein the first station includes a base station.

4. The method of claim 1, wherein the plurality of stations includes a plurality of remote stations.

5. The method of claim 1, wherein determining is performed by a base station.

6. The method of claim 1, wherein determining is performed by a base station controller.

7. The method of claim 1, further comprising:

determining whether the first station can decode messages in the data rate control information.

8. The method of claim 7, further comprising:

setting the amount of power required to transmit the power control information to the plurality of stations at a first constant value if the first station cannot decode messages in the data rate control information.

9. The method of claim 1, further comprising:

calculating a signal-to-interference-plus-noise ratio (SINR) from the received data rate control information.

10. The method of claim 9, wherein the calculating a SINR includes obtaining a SINR value corresponding to the received data rate control information in a table.

11. The method of claim 9, further comprising:

increasing the SINR value by a second constant value if the received data rate control information is directed at another destination sector of the first station.

12. The method of claim 9, further comprising:

providing a plurality of base stations, wherein the first station is a first base station of the plurality of base stations.

13. The method of claim 12, further comprising:

decreasing the SINR value by a third constant value if the received data rate control information is directed at another base station other than the first base station.

14. The method of claim 13, wherein decreasing the SINR value includes providing a minimum threshold value for the SINR value.

15. The method of claim 9, further comprising:

smoothing the calculated SINR value using a filter.

16. The method of claim 15, further comprising:

mapping the smoothed SINR value to a required fractional reverse power control (RPC) power allocation r_k using the relationship r_k=10<sup>0.1*(E−

c_k−

10*log₁₀PG)</sup>, where E is the target RPC bit energy per noise power spectral density (E_b/N₀)in dB, c_k is the smoothed SINR value, and PG is the RPC subchannel processing gain.

17. The method of claim 1, wherein the determining includes:

providing a plurality of reverse link power control (RLPC) channels; and

assigning a reverse activity (RA) bit to one of the plurality of RLPC channels.

18. The method of claim 17, further comprising:

allocating a fixed fraction of total power to the RA bit.

19. The method of claim 18, further comprising:

determining activity status of the RLPC channels.

20. The method of claim 19, further comprising:

allocating a remainder of the total power, after allocating the fixed fraction to the RA bit, to the RLPC channels that are active.

2. A base station within a communication system, including:

a receiver configured to receive data rate control information from a plurality of stations, the data rate control information indicating the data rate at which power control information is to be transmitted by the base station to the plurality of stations;

a processor, coupled to the receiver, configured to adjust the data rate control information from each station of the plurality of stations based upon a destination sector of the data rate control information, wherein the processor uses the adjusted data rate control information to determine the amount of power required to transmit the power control information from the base station to the plurality of stations.

21. The base station of claim 2, wherein the signal processor includes:

a calculator configured to calculate a signal-to-interference-plus-noise ratio (SINR) value from the received data rate control information.

22. The base station of claim 21, further comprising:

a memory configured to store data comprising a table of values that establishes a correspondence between the data rate control information and the SINR value for each station of the plurality of stations.

23. A wireless communication system, comprising:

a plurality of remote station devices configured to determine and transmit data rate control information; and

a base station apparatus configured to receive the data rate control information from the plurality of remote station devices, the data rate control information indicating the data rate at which power control information is to be transmitted by a first station to the plurality of stations, the base station apparatus operating to adjust the data rate control information from each device of the plurality of remote station devices based upon a destination sector of the data rate control information,

wherein the base station apparatus uses the adjusted data rate control information to determine the amount of power required to transmit the power control information from the base station apparatus to the plurality of remote station devices.

24. The system of claim 23, wherein each device of the plurality of remote station devices includes a digital signal processor (DSP) configured to encode and modulate information in the data rate control information.