Outage compensation in a cellular network

• US 10,050,826 B2
• Filed: 09/04/2015
• Issued: 08/14/2018
• Est. Priority Date: 11/06/2014
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Hevizi, Laszlo, Racz, Andras, Stjernholm, Paul
• Primary Examiner(s): Lopata, Robert J
• Application Number:
  US15/522,000
• Publication Number:
  US 20170317873A1
• Time in Patent Office: 1,075 Days
• Field of Search: 370216
• CPC Class Codes: H04L 41/0661 by reconfiguring faulty entities
• CPC Class Codes: H04L 41/0663 Performing the actions predefined by failover planning, e.g. switching to standby network elements
• CPC Class Codes: H04L 41/0681 Configuration of triggering conditions
• CPC Class Codes: H04L 41/147 for predicting network behaviour
• CPC Class Codes: H04L 41/16 using machine learning or artificial intelligence
• CPC Class Codes: H04W 24/04 Arrangements for maintaining operational condition

Abstract

The invention comprises a method for controlling an outage of a network element (300) in a cellular network (40) using an outage database (130), the outage database containing for each of a plurality of the network elements (300) controlled by the cellular network at least the following network element dependent information: first operating parameters describing an error free operation of the corresponding network element, outage detection rules indicating when a outage for the corresponding network element is present, outage compensation rules indicating how the outage of the corresponding network element should be compensated, the outage compensation rules including compensation parameters to be used by compensating network elements (300b-300g) in order to compensate the outage of one of the network elements (300a). The method comprises the steps of: continuously receiving current operating parameters for a plurality of network elements (300), updating the first operating parameters and the outage detection rules for the plurality of network elements taking into account the current operating parameters, detecting an outage for one of the network elements by comparing the received current operating parameters to the outage detection rules for said one network element, wherein if an outage is detected for said one network element, determining and applying the outage compensation rules for said one network element (300a), wherein applying the compensation rules includes optimizing the compensation parameters in order to calculate optimized operating parameters for the compensating network elements (300b-300g) used to compensate for the outage of said one network element, evaluating the application of the compensation rules, and storing the optimized operating parameters in the compensation rules as starting parameters for a future optimization of the compensation parameters in case of an outage of said one network element in dependence on the evaluation.

Claims

1. A method for controlling an outage of a network element in a cellular network using an outage database;

the outage database containing, for each of a plurality of the network elements controlled by the cellular network, at least the following network element dependent information;

first operating parameters describing an error free operation of the corresponding network element, outage detection rules indicating when an outage for the corresponding network element is present, outage compensation rules indicating how the outage of the corresponding network element should be compensated, the outage compensation rules including compensation parameters to be used by compensating network elements in order to compensate for the outage of one of the network elements;

the method comprising;

continuously receiving current operating parameters for a plurality of network elements;

updating the first operating parameters and the outage detection rules for the plurality of network elements taking into account the current operating parameters;

detecting an outage for one of the network elements by comparing the received current operating parameters to the outage detection rules for the one network element; and

in response to detecting an outage for the one network element;

determining and applying the outage compensation rules for the one network element, wherein applying the compensation rules comprises optimizing the compensation parameters in order to calculate optimized operating parameters for the compensating network elements used to compensate for the outage of the one network element;

evaluating the application of the compensation rules; and

storing, based on the evaluation, the optimized operating parameters in the compensation rules as starting parameters for a future optimization of the compensation parameters in case of an outage of the one network element.

2. The method of claim 1, wherein the received current operating parameters for the one network element are analyzed over time in order to determine a range of the first operating parameters in which an error free operation of the one network element is assumed;

and wherein the range of the first operating parameters is adapted based on the received current operating parameters.

3. The method of claim 2, wherein an outage is detected for the one network element when at least one of the current operating parameters is outside the determined range or when a value of at least one of the current operating parameters changes over a defined time period by more than a threshold.

4. The method of claim 1, wherein the compensation rules include:

information on whether, when an outage is detected for one of the network elements, the outage of the one network element should be compensated for at all or not; and

information on whether the one network element can be used as compensating network element.

5. The method of claim 1, wherein the detecting an outage for the one network element comprises:

identifying the compensating network elements used to compensate for the outage of the one network element;

storing the currently used operating parameters of the compensating network elements;

configuring the compensating network elements using the compensation parameters stored in the outage database for the one network element; and

calculating the optimized operating parameters for the compensating network elements;

wherein, when the outage of the one network element is overcome;

the compensating network elements are reconfigured with the stored operating parameters; and

the calculated optimized operating parameters are stored for the one network element for a future outage of the one network element; and

an evaluation of the application of the optimized operating parameters is positive.

6. The method of claim 1:

wherein, in response to detecting the outage for one of the network elements, an operating status of the one network element is validated after the outage is detected; and

wherein, in response to the outage of the one network element being confirmed by the operating status, a validity of the detection rule that was used to identify the outage is increased.

7. The method of claim 1:

wherein the outage database is initialized by simulating the outage of different network elements in the cellular network using a radio planning tool; and

wherein the compensating network elements and the initial compensation parameters are identified based on the simulation.

8. The method of claim 1:

wherein, in response to detecting an outage for the one network element, a timer is initialized for the one network element, and it is checked within a time period defined by the timer whether another of the outage detection rules indicates an outage of the one network element;

wherein only when another of the outage detection rules indicates the outage of the one network element, the outage of the one network element is determined and a validity of the outage compensation rule is increased.

9. An apparatus configured to control an outage of a network element in a cellular network, comprising:

an outage database;

the outage database containing, for each of a plurality of the network elements controlled by the cellular network, at least the following network element dependent information;

first operating parameters describing an error free operation of the corresponding network element;

outage detection rules indicating when an outage for the corresponding network element is present;

outage compensation rules indicating how the outage of the corresponding network element should be compensated, the outage compensation rules including compensation parameters to be used by compensating network elements in order to compensate for the outage of one of the network elements;

processing circuitry;

memory containing instructions executable by the processing circuitry whereby the apparatus is operative to;

continuously receive current operating parameters for a plurality of network elements;

update the first operating parameters and the outage detection rules for the plurality of network elements taking into account the current operating parameters;

detect an outage for one of the network elements by comparing the received current operating parameters to the outage detection rules for the one network element;

in response to detecting an outage for the one network element;

determine and apply the outage compensation rules for the one network element, wherein applying the outage compensation rules comprises optimizing the compensation parameters in order to calculate optimized operating parameters for the compensating network elements used to compensate for the outage of the one network element;

evaluate the application of the compensation rules; and

store the optimized operating parameters in the compensation rules as starting parameters for a future optimization of the compensation parameters based on the evaluation.

10. The apparatus of claim 9, wherein the instructions are such that the apparatus is operative to:

analyze the received current operating parameters for the one network element over time in order to determine a range of the first operating parameters in which an error free operation of the one network element is assumed;

adapt the range of the first operating parameters based on the received current operating parameters.

11. The apparatus of claim 9, wherein the instructions are such that the apparatus is operative to detect the outage for the one network element when at least one of the current operating parameters is outside the determined range, or when a value of at least one of the current operating parameters changes over a defined time period by more than a threshold.

12. The apparatus of claim 9, wherein the instructions are such that the apparatus is operative to, in response to detecting the outage for one of the network elements:

validate an operating status of the one network element; and

in response to the outage of the one network element being confirmed by the operating status, increase a validity of the detection rule that was used to identify the outage.

13. The apparatus of claim 9, wherein the compensation rules include:

information on whether, when an outage is detected for one of the network elements, the outage of the one network element should be compensated for at all or not; and

information on whether the one network element can be used as compensating network element.

14. The apparatus of claim 9, wherein the instructions are such that the apparatus is operative to detect the outage for the one network element by:

identifying the compensating network elements used to compensate for the outage of the one network element;

storing the currently used operating parameters of the compensating network elements;

configuring the compensating network elements using the compensation parameters stored in the outage database for the one network element;

calculating the optimized operating parameters for the compensating network elements;

wherein, when the outage of the one network element is overcome;

the compensating network elements are reconfigured with the stored operating parameters; and

the calculated optimized operating parameters are stored for the one network element for a future outage of the one network element; and

an evaluation of the application of the optimized operating parameters is positive.

15. The apparatus of claim 9:

wherein the instructions are such that the apparatus is operative to initialize the outage database by simulating the outage of different network elements in the cellular network using a radio planning tool; and

wherein the compensating network elements and the initial compensation parameters are identified based on the simulation.

16. The apparatus of claim 9, wherein the instructions are such that the apparatus is operative to:

in response to detecting an outage for the one network element, initialize a timer for the one network element, and check, within a time period defined by the timer, whether another of the outage detection rules indicates an outage of the one network element;

wherein only when another of the outage detection rules indicates the outage of the one network element, the outage of the one network element is determined and a validity of the outage compensation rule is increased.

17. A non-transitory computer readable recording medium storing a computer program product for controlling an outage of a network element in a cellular network using an outage database;

the outage database containing, for each of a plurality of the network elements controlled by the cellular network, at least the following network element dependent information;

first operating parameters describing an error free operation of the corresponding network element, outage detection rules indicating when an outage for the corresponding network element is present, outage compensation rules indicating how the outage of the corresponding network element should be compensated, the outage compensation rules including compensation parameters to be used by compensating network elements in order to compensate for the outage of one of the network elements;

the computer program product comprising software instructions which, when run on processing circuitry of an entity the cellular network, cause the entity to;

continuously receive current operating parameters for a plurality of network elements;

update the first operating parameters and the outage detection rules for the plurality of network elements taking into account the current operating parameters;

detect an outage for one of the network elements by comparing the received current operating parameters to the outage detection rules for the one network element; and

in response to detecting an outage for the one network element;

determine and apply the outage compensation rules for the one network element, wherein applying the compensation rules comprises optimizing the compensation parameters in order to calculate optimized operating parameters for the compensating network elements used to compensate for the outage of the one network element;

evaluate the application of the compensation rules; and

store, based on the evaluation, the optimized operating parameters in the compensation rules as starting parameters for a future optimization of the compensation parameters in case of an outage of the one network element.

18. The non-transitory computer readable recording medium of claim 17, wherein the instructions are such that the instructions, when executed by the processing circuitry of the entity, cause the entity to:

analyze the received current operating parameters for the one network element over time in order to determine a range of the first operating parameters in which an error free operation of the one network element is assumed; and

adapt the range of the first operating parameters based on the received current operating parameters.

19. The non-transitory computer readable recording medium of claim 18, wherein the instructions are such that the instructions, when executed by the processing circuitry of the entity, cause the entity to detect an outage for the one network element when at least one of the current operating parameters is outside the determined range or when a value of at least one of the current operating parameters changes over a defined time period by more than a threshold.

20. The non-transitory computer readable recording medium of claim 17, wherein the instructions are such that the instructions, when executed by the processing circuitry of the entity, cause the entity to:

in response to detecting the outage for one of the network elements, validate, after the outage is detected, an operating status of the one network element; and

in response to the outage of the one network element being confirmed by the operating status, increase a validity of the detection rule that was used to identify the outage.