Mobile Network Sleeping Cell Detection Using Aggregated KPIs

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Solution Overview

Problem

Detecting sleeping cells in mobile networks is challenging due to their ability to appear functional but fail to establish new connections without generating alarms, leading to customer dissatisfaction and revenue loss, and manual testing is inefficient and costly.

Innovation Solution

Utilizing key performance indicators (KPIs) such as Zero RRC, CRC, and SIB, combined with machine learning, to remotely identify sleeping cells by analyzing aggregated data over time and comparing it against threshold values, generating alerts for potential sleeping cells.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If manual checking is used to detect sleeping cells, then detection capability is improved, but labor cost and time consumption increase

Engineering Contradiction:
Improvedetection capabilityVSAvoidtime consumption
Core Design Contradiction:
Measurement precisionVSLoss of time

Solution Approach 1:

The patent replaces manual mechanical checking with an automated electronic system that collects KPI data from the network and uses machine learning algorithms to detect sleeping cells. The system automatically analyzes connection establishment failures, message transmission issues, and other network parameters to identify sleeping cells without human intervention, thereby eliminating time consumption and labor costs while maintaining high detection precision.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces an intermediary detection system that acts as a mediator between the network operations and the operator. This system collects KPI data from various network components, processes it through machine learning models, and generates alerts about sleeping cells. The intermediary system filters and analyzes large volumes of network data, presenting only relevant information to operators, thus improving detection efficiency without requiring manual checking of all network elements.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Area of stationary object

If the number of cells is increased to expand coverage, then network coverage is improved, but the complexity of detecting sleeping cells increases

Engineering Contradiction:
Improvenetwork coverageVSAvoiddetection complexity
Core Design Contradiction:
Area of stationary objectVSDevice complexity

Solution Approach 1:

The patent implements a universal detection system that can monitor and analyze multiple cells simultaneously using the same KPI collection and machine learning framework. The system is designed to handle variable numbers of cells by dynamically adjusting its analysis scope, allowing it to scale from small to large networks without requiring different detection methodologies. This multi-functional approach maintains consistent detection capability across networks of any size.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent segments the detection process into modular components: KPI data collection from individual cells, aggregation of data across multiple cells, machine learning analysis, and alert generation. This segmentation allows the system to process large numbers of cells by dividing the workload into manageable units that can be handled independently and in parallel, thereby reducing the perceived complexity even as network coverage expands.

Inventive Principle:
Principle #1Segmentation

3Productivity

If automated detection using KPIs and machine learning is implemented, then detection efficiency is improved, but system complexity increases

Engineering Contradiction:
Improvedetection efficiencyVSAvoidsystem complexity
Core Design Contradiction:
ProductivityVSDevice complexity

Solution Approach 1:

The patent implements a self-service detection system where the network infrastructure itself provides the data needed for detection through standard KPI collection mechanisms. The machine learning models are trained on historical network data and automatically adapt to changing network conditions without requiring manual reconfiguration. The system serves itself by utilizing existing network telemetry infrastructure, thereby improving detection efficiency without proportionally increasing system complexity.

Inventive Principle:
Principle #25Self-service

Solution Approach 2:

The patent leverages parameter changes in KPI values over time to detect sleeping cells. The machine learning system monitors temporal variations in connection establishment rates, message transmission success rates, and other KPI parameters. By focusing on changes in these parameters rather than absolute values, the system achieves high detection efficiency using relatively simple computational approaches, avoiding the need for extremely complex analysis systems.

Inventive Principle:
Principle #35Parameter changes

Data Source

PatentUS12376011B2Detecting of sleeping cell in a mobile network
Publication Date: 2025.07.29 RAKUTEN SYMPHONY INC
  • US12376011B2 patent drawing
  • US12376011B2 patent drawing
  • US12376011B2 patent drawing

AI summary

A method includes collecting data related to a key performance indicator (KPI) for a cell in a mobile network. The method includes aggregating the collected data for the KPI into a plurality of groups, wherein a first group of the plurality of groups comprises values of the KPI during a time period in a first day, a second group of the plurality of groups comprises values of the KPI during the time period in a second day preceding the first day, and a third group of the plurality of groups comprises values of the KPI during the time period in a third day preceding the second day. The method includes determining whether the cell is a sleeping cell based on a comparison of the first, second and third groups. The method includes labelling the cell as sleeping in response to a determination that the cell is sleeping.