System and method for identification of uplink/downlink interference sources

• US 6,442,384 B1
• Filed: 10/22/1999
• Issued: 08/27/2002
• Est. Priority Date: 10/22/1999
• Status: Expired due to Fees

• Current Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Shah, Ali R., Hʼmimy, Hossam
• Primary Examiner(s): Hunter, Daniel
• Assistant Examiner(s): D AGOSTA, STEPHEN M
• Application Number:
  US09/426,139
• Time in Patent Office: 1,040 Days
• Field of Search: 455/423, 455/62, 455/63, 455/64, 455/67.3, 455/424, 455/283, 455/293, 455/501
• US Class Current: 455/423
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements

Abstract

A system and method of identifying the source of uplink and downlink interference in a disturbed cell of a wireless telecommunications network. Initially, call events occurring in offending cells are recorded. In conjunction, the disturbance events occurring in the disturbed cell of the telecommunications network are recorded. The recorded call events with recorded disturbance events are then correlated. A distribution of disturbed and offending cells within the telecommunications network as a function of time is computed to obtain a statistical correlation of call events in offending cells and subsequent disturbances resulting in the disturbed cell to identify the possible source of disturbances that caused the sealing of the sealed device with in the disturbed cell.

Claims

1. In a telecommunications network including one disturbed cell containing at least one sealed device and a plurality of offending cells, a method of identifying the source of interference in the disturbed cell comprising the steps of:

recording call events occurring in offending cells of the telecommunications network;

recording disturbance events occurring in the disturbed cell of the telecommunications network;

correlating recorded call events with recorded disturbance events; and

computing a distribution of disturbed and offending cells within the telecommunications network as a function of time to obtain a statistical correlation of call events in offending cells and subsequent disturbances resulting in said disturbed cell to identify the possible source of disturbances that caused the sealing of the sealed device within the disturbed cell.

2. The method according to claim 1 wherein said steps of recording call events occurring in offending cells and recording disturbance events occurring in the disturbed cell are run in conjunction with each other.

3. The method according to claim 1 wherein said correlating step is performed as a function of time.

4. The method according to claim 1 wherein said correlating step is followed by a counting step, said counting step comprising the step of identifying the number of disturbance events associated with the disturbed cell.

5. The method according to claim 4 wherein said counting step is performed within a delta time once a call event ends causing the disturbance events to end.

6. The method according to claim 1 wherein said correlating step is followed by the step of attempting (voice channel seizure events) for possible adjacent channel (or adjacent channel) mobiles in Call Event Recordings (CER), said attempting step performed by the time stamps of the call start.

7. The method according to claim 1 further comprising the step of verifying said disturbance events, said verifying step performed using free space path loss considerations.

8. The method according to claim 7 wherein said verifying step further comprises the step of excluding from further analysis all adjacent channel cells for which calculated signal attenuation indicates that they are too far away to be able to generate perceived disturbance events.

9. The method according to claim 1 further comprising the step of identifying internal sources of interference on the downlink using reciprocity.

10. The method according to claim 9 wherein said identifying step is followed by the step of disturbing the mobiles of the offending cells on the downlink if the mobiles of the offending cells create interference on the uplink for the disturbed cell via reciprocity.

11. In a telecommunications network including one disturbed cell containing at least one sealed device and a plurality of offending cells, a system for identifying the source of uplink interference in the disturbed cell comprising:

a means for recording call events occurring in offending cells of the telecommunications network;

a means for recording disturbance events occurring in the disturbed cell of the telecommunications network;

a means for correlating recorded call events with recorded disturbance events; and

a means for computing a distribution of disturbed and offending cells within the telecommunications network as a function of time to obtain a statistical correlation of call events in offending cells and subsequent disturbances resulting in said disturbed cell to identify the possible source of disturbances that caused the sealing of the sealed device within the disturbed cell.

12. The system according to claim 11 wherein said means for recording call events occurring in offending cells and said means for recording disturbance events occurring in the disturbed cell are configured to run in conjunction with each other.

13. The system according to claim 11 wherein said means for correlating is configured to execute as a function of time.

14. The system according to claim 11 wherein said means for correlating further includes a means for counting adapted to identify the number of disturbance events associated with the disturbed cell.

15. The system according to claim 14 wherein said means for counting is configured to execute within a delta time once a call event ends causing the disturbance events to end.

16. The system according to claim 11 wherein said means for correlating further comprises a means for attempting (voice channel seizure events) for possible adjacent channel (or adjacent channel) mobiles in Call Event Recordings (CER), said means for attempting configured to execute via time stamps of the call start.

17. The system according to claim 11 further comprising a means for verifying said disturbance events, said means for verifying configured to perform using free space path loss considerations.

18. The system according to claim 17 wherein said means for verifying further comprises a means for excluding from further analysis all adjacent channel cells for which calculated signal attenuation indicates that they are too far away to be able to generate perceived disturbance events.

19. The system according to claim 11 further comprising a means for identifying internal sources of interference on the downlink using reciprocity.

20. The system according to claim 19 wherein said means for identifying further includes a means for disturbing the mobiles of the offending cells on the downlink if the mobiles of the offending cells create interference on the uplink for the disturbed cells via reciprocity.

21. In a telecommunications network including one disturbed cell containing at least one sealed device and a plurality of offending cells, a program product for identifying the source of uplink interference in the disturbed cell comprising:

instruction means residing in a computer for recording call events occurring in offending cells of the telecommunications network;

instruction means residing in a computer for recording disturbance events occurring in the disturbed cell of the telecommunications network;

instruction means residing in a computer for correlating recorded call events with recorded disturbance events; and

instruction means residing in a computer for computing a distribution of disturbed and offending cells within the telecommunications network as a function of time to obtain a statistical correlation of call events in offending cells and subsequent disturbances resulting in said disturbed cell to identify the possible source of disturbances that caused the sealing of the sealed device within the disturbed cell.

22. The program product according to claim 21 wherein said instruction means residing in a computer for recording call events occurring in offending cells and instruction means residing in a computer for recording disturbance events occurring in the disturbed cell are configured to run in conjunction with each other.

23. The program product according to claim 21 wherein said instruction means residing in a computer for correlating is configured to perform as a function of time.

24. The program product according to claim 21 wherein said instruction means residing in a computer for correlating further comprising an instruction means residing in a computer for counting, said means for counting adapted to identify the number of disturbance events associated with the disturbed cell.

25. The program product according to claim 24 wherein said instruction means residing in a computer for counting is configured to perform within a delta time once a call event ends causing the disturbance events to end.

26. The program product according to claim 21 wherein said instruction means residing in a computer for correlating further comprises an instruction means residing in a computer for attempting (voice channel seizure events) for possible adjacent channel (or adjacent channel) mobiles in Call Event Recordings (CER), said instruction means residing in a computer for attempting configured to perform via time stamps of the call start.

27. The program product according to claim 21 further comprising instruction means residing in a computer for verifying said disturbance event, said instruction means residing in a computer for verifying configured to perform using free space path loss considerations.

28. The program product according to claim 27 wherein said instruction means residing in a computer for verifying further comprises instruction means residing in a computer for excluding from further analysis all adjacent channel cells for which calculated signal attenuation indicates that they are too far away to be able to generate perceived disturbance events.

29. The program product according to claim 21 further comprising instruction means residing in a computer for identifying internal sources of interference on the downlink using reciprocity.

30. The program product according to claim 29 wherein said instruction means residing in a computer for identifying is followed by instruction means residing in a computer for disturbing the mobiles of the offending cells on the downlink if the mobiles of the offending cells create interference on the uplink for the disturbed cell via reciprocity.