Radio Base Station RLF Report Handling for MRO Accuracy

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Solution Overview

Problem

In radio communications networks, the ambiguity in identifying whether a reestablishment cell is successful or failed during a Radio Link Failure (RLF) event leads to uncertainty in Mobility Robustness Optimization (MRO) processes, as the UE reports the cell ID for attempted reestablishment rather than the completed reestablishment, causing difficulties in determining suitable handover candidates.

Innovation Solution

A method is implemented in the first radio base station to compare the reported reestablishment cell ID with the current cell ID of the connected UE, discarding ambiguous RLF reports and incrementing a counter for mismatched cells, then reporting this information to an Operation and Maintenance (O&M) node, which correlates this data to provide accurate MRO insights.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the UE reports the cell ID for attempted reestablishment, then the MRO process can identify reestablishment cells, but the ambiguity arises in determining whether the reestablishment was successful or failed

Engineering Contradiction:

Improveidentification accuracy of reestablishment cellVSAvoidinformation about reestablishment outcome

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The solution segments the RLF report handling by comparing the reported cell ID with the current connected cell ID. This segmentation allows the system to distinguish between successful reestablishment (IDs match) and failed reestablishment (IDs don't match), thereby resolving the ambiguity while preserving the reporting mechanism.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system implements feedback by comparing the reported cell ID with the current connected cell ID and using this comparison result to determine whether to process the RLF report for MRO purposes. This feedback mechanism ensures that only relevant information (successful reestablishments) is used for optimization decisions.

Inventive Principle:

Principle #23Feedback

2Quantity of substance

If the eNB generates RLF indication for each attempted reestablishment, then all reestablishment attempts are recorded, but the ambiguity prevents knowing whether the cell should be considered during MRO

Engineering Contradiction:

Improvenumber of recorded reestablishment attemptsVSAvoidreliability of MRO decision data

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The solution extracts only the relevant subset of RLF reports (those with matching cell IDs indicating successful reestablishment) from the total set of attempted reestablishments. This extraction ensures that MRO processes use only reliable data while maintaining comprehensive recording of all attempts for potential other uses.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The system applies different quality treatment to different RLF reports based on the comparison result. Reports with matching cell IDs are treated as high-quality data for MRO, while non-matching reports are excluded. This local quality differentiation ensures reliable MRO decisions without losing the complete record.

Inventive Principle:

Principle #3Local quality

3Measurement precision

If the first radio base station processes and compares cell IDs for all received RLF reports, then accurate MRO decisions can be made, but the processing complexity and time increase

Engineering Contradiction:

Improveaccuracy of MRO analysisVSAvoidcomplexity of RLF report processing

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The solution implements a dynamic processing approach where the handling of RLF reports is adjusted based on the comparison result. The system dynamically determines whether to accept or reject each report, optimizing the balance between accuracy and processing efficiency by applying simple comparison logic rather than complex analysis to all reports.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS10129775B2Method in a first radio base station for handling re-establishment of a connection due to radio link failure

Publication Date: 2018.11.13 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

Embodiments herein relates to a method in a first radio base station (12) for handling communication in a radio communications network (1), which first radio base station (12) is comprised in the radio communications network (1). The first radio base station (12) receives a report of a radio link failure, RLF, of a wireless device (10), from the wireless device (10), which report comprises an identity of a first cell (11) for re-establishing connection in. The first radio base station (12) compares the identity of the first cell (11) in the received report with a cell identity of a current cell the wireless device (10) is currently connected to. In case the identities do not match, the first radio base station (12) discards the report of an RLF, increments a counter counting a number of times that the first cell was reported as a reestablishment cell and not being a current cell to which the wireless device (10) is currently connected to, and reports a report of an event to an Operation and Maintenance, O&M, node (15), which report of an event comprises the number of the counter.