CDMA forward link power overload control in a base station

• US 6,094,585 A
• Filed: 11/14/1997
• Issued: 07/25/2000
• Est. Priority Date: 11/14/1997
• Status: Expired due to Term

• Current Assignee: WSOU Investments, LLC (WSOU Holdings, LLC)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Kim, Kyoung, Jiang, Frances, Dajer, Miguel, Nardozza, Gregg
• Primary Examiner(s): Tsanf, Fan
• Assistant Examiner(s): SOBUTKA, PHILIP
• Application Number:
  US08/970,588
• Time in Patent Office: 984 Days
• Field of Search: 455/522, 455/127, 455/115, 455/117, 455/561, 455/403, 455/422, 455/423, 455/424, 375/140, 375/142, 375/146, 375/147, 375/150, 370/335, 370/342
• US Class Current: 455/522
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 52/343 taking into account loading or congestion level

Abstract

A processor monitors the real time forward link power utilization in a base station, and a controller regulates the real time forward link power utilization in the base station. The processor and controller operate in a feedback configuration to maintain call quality and prevent damage to the base station. The processor determines real time forward link power utilization on a per frame basis by taking samples at a per chip rate within each frame. The forward link power is then obtained by taking the mean of the samples.

Claims

1. An apparatus for providing forward link power control in a base station, comprising:

a processor for monitoring real time forward link power utilization frame by frame in the base station wherein said processor determines said real time forward link power utilization by taking samples at a chip rate within each frame; and

a controller for regulating forward link power allocation in the base station,

wherein said processor and said controller operate in a feedback configuration to prevent overloading of the base station.

2. The apparatus according to claim 1, wherein said samples are samples of in-phase ("I") and quadrature ("Q") components of a data stream.

3. The apparatus according to claim 2, wherein said processor further includes:

a summer for calculating I² +Q² for each sample in a frame; and

a summer for summing all I² +Q² samples for each frame.

4. The apparatus according to claim 2, wherein said processor further includes:

a summer for calculating I² +Q² for each sample in a frame;

a summer for summing all I² +Q² samples for each frame; and

a divider for dividing a total I² +Q² by a total number of samples.

5. The apparatus according to claim 1, wherein said controller responds to additional power requests by comparing said real time forward link power utilization against a threshold value.

6. An apparatus for providing forward link power control in a base station, comprising:

a processor for monitoring real time forward link power utilization in the base station; and

a controller for regulating forward link power allocation in the base station,

wherein said processor and said controller operate in a feedback configuration to prevent overloading of the base station and said processor determines said real time forward link power utilization by taking I and Q samples at a chip rate within each frame.

7. The apparatus according to claim 6, wherein said processor determines said real time forward link power utilization by taking a mean of all I² +Q² samples within each frame.

8. The apparatus according to claim 7, wherein said controller includes a call admission means for, based on total allocated transmit power, blocking all new calls when said real time forward power utilization is above a specified threshold.

9. A method for providing forward link power control in a base station, said method comprising the steps of:

monitoring real time forward link power utilization in the base station frame by frame and taking in-phase ("I") and quadrature ("Q") samples at a chip rate within each frame; and

allocating forward link power in the base station in response to said real time forward link power utilization and requests for additional transmit power such that overloading of the base station is prevented.

10. The method according to claim 9, wherein said step of monitoring includes the steps of:

calculating I² +Q² for each sample in a frame; and

summing all I² +Q² samples for each frame.

11. The method according to claim 9, wherein said step of monitoring includes the steps of:

calculating I² +Q² for each sample in a frame; and

summing all I² +Q² samples for each frame; and

dividing a total I² +Q² by a total number of samples.

12. The method according to claim 9, wherein said step of allocating is done by comparing said real time forward link power utilization against a threshold value.

13. The method according to claim 9, wherein said step of monitoring includes taking a sum of all I² +Q² samples within each frame.

14. The method according to claim 13, wherein said step of monitoring further includes the step of calculating a mean of all I² +Q² samples within each frame.

15. The method according to claim 14, wherein said step of allocating is done by comparing said real time forward link power utilization against a threshold value.

16. The method according to claim 14, wherein said step of allocating includes the step of admitting new calls, based on total allocated transmit power, by blocking all said new calls when said real time forward power utilization is above a specified threshold.