Method and system for monitoring power output in transceivers

• US 6,434,386 B1
• Filed: 12/31/1998
• Issued: 08/13/2002
• Est. Priority Date: 12/31/1998
• Status: Expired due to Term

• Current Assignee: Optis Wireless Technology, LLC (Brevet Capital)
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Lundborg, Tomas
• Primary Examiner(s): Chin, Vivian
• Assistant Examiner(s): APPIAH, CHARLES NANA
• Application Number:
  US09/223,633
• Time in Patent Office: 1,321 Days
• Field of Search: 455/436, 455/522, 455/437, 455/434, 455/439, 455/442, 455/69, 455/70, 370/331, 370/332, 370/335, 370/330
• US Class Current: 455/436
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 36/08 Reselecting an access point
• CPC Class Codes: H04W 52/04 TPC
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A method and system for monitoring output power of transceivers in radiocommunication systems are described. By evaluating a statistic associated with pre- and post handoff received signals, information can be gathered regarding the transmit power operating characteristic of various transceivers. For example, by measuring the received signal strength of a neighboring base station'"'"'s control channel prior to handoff and comparing that with the received signal strength of a traffic channel transmitted by the same base station after handoff, the system can acquire information regarding the power output of a base station transceiver. Over time, the system can determine whether one or more power settings associated with that transceiver needs adjustment.

Claims

1. A method for monitoring output transmit power of transceivers in a radiocommunication system comprising the steps of:

measuring a first received signal quality associated with a measurement channel being transmitted by a base station;

measuring a second received signal quality associated with a traffic channel being transmitted by said base station;

determining a difference between said first and second received signal qualities; and

,

using said difference to monitor an output power of a transceiver of said base station.

2. The method of claim 1, wherein said step of measuring a first received signal quality is performed by a mobile station prior to a handoff to said base station and said step of measuring said second received signal quality is performed by said mobile station after a handoff to said base station.

3. The method of claim 1, wherein said first and second received signal qualities are received signal strengths.

4. The method of claim 1, wherein said measurement channel is a control channel.

5. The method of claim 1, wherein said step of using further comprises the steps of:

accumulating said difference with other differences calculated for said transceiver; and

comparing said accumulated difference with a threshold.

6. The method of claim 5, further comprising the step of:

providing an alarm indication if said accumulated difference exceeds said threshold.

7. The method of claim 5, further comprising the step of:

adjusting an output power of said transceiver if said accumulated difference exceeds said threshold.

8. The method of claim 5, further comprising the step of:

adjusting a power difference between said measurement channel and said traffic channel if said accumulated difference exceeds said threshold.

9. A method for monitoring output transmit power of transceivers in a radiocommunication system comprising the steps of:

measuring a first received signal quality associated with a traffic channel being transmitted by a first base station;

measuring a second received signal quality associated with a traffic channel being transmitted by a second base station;

determining a difference between said first and second received signal qualities; and

using said difference to monitor an output power of a transceiver of one or both of said first and second base stations.

10. The method of claim 9, wherein said step of measuring a first received signal quality is performed by a mobile station prior to a handoff to said second base station and said step of measuring said second received signal quality is performed by said mobile station after a handoff to said second base station.

11. The method of claim 9, wherein said first and second received signal qualities are received signal strengths.

12. The method of claim 9, wherein said step of using further comprises the steps of:

accumulating said difference with other differences calculated for said transceiver; and

comparing said accumulated difference with a threshold.

13. The method of claim 12, further comprising the step of:

providing an alarm indication if said accumulated difference exceeds said threshold.

14. The method of claim 12, further comprising the step of:

adjusting an output power of said transceiver if said accumulated difference exceeds said threshold.

15. The method of claim 12, further comprising the step of:

adjusting a power difference between said measurement channel and said traffic channel if said accumulated difference exceeds said threshold.

16. An apparatus for monitoring output transmit power of transceivers in a radiocommunication system comprising:

a switch for coordinating the operation of said transceivers and storing parameters associated with controlling said output power of said transceivers; and

a processor for;

(a) receiving, from said switch, signal quality difference information associated with handoff,

(b) processing said received signal quality difference information using at least one logic function, and

(c) returning a changed value to at least one of said stored parameters.

17. The apparatus of claim 16, wherein said signal quality difference information further comprises:

a difference between a first signal strength measured on a first traffic channel prior to a handoff and a second signal strength measured on a second traffic channel after said handoff.

18. The apparatus of claim 16, wherein said signal quality difference information further comprises:

a difference between a first signal strength measured on a control channel prior to a handoff and a second signal strength measured on a traffic channel after said handoff.

19. The apparatus of claim 16, wherein said switch controls a plurality of transceivers and said stored parameters include a relative power difference between traffic channels and control channels, which relative power difference applies to a group of said plurality of transceivers associated with a particular base station.

20. The apparatus of claim 16, wherein said switch controls a plurality of transceivers and said stored parameters include an output transmit power setting associated with each individual transceiver.

21. The apparatus of claim 16, wherein said processor is co-located with said switch.

22. The apparatus of claim 16, further comprising:

means for outputting said changed value to a network operator.

23. The apparatus of claim 16, further comprising:

means for replacing a stored parameter in said switch with said changed value.