UE Logged MDT Measurement Filtering by PLMN Identity

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Solution Overview

Problem

In wireless communications networks, UEs do not check if the PLMN associated to the serving cell belongs to the configured plmn-IdentityList during logged measurement reporting, leading to incorrect reporting of measurements from cells belonging to different PLMNs.

Innovation Solution

The UE logs measurements associated to the last serving cell only if the cell belongs to a PLMN configured in the plmn-IdentityList of the logged MDT configuration, ensuring compliance with network configurations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If the UE logs measurements for all serving cells without checking PLMN membership, then the quantity of collected measurements increases, but the reliability of measurement reporting deteriorates due to incorrect reporting of measurements from cells belonging to different PLMNs

Engineering Contradiction:

Improvequantity of measurementsVSAvoidreliability of measurement reporting

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent applies preliminary action by checking PLMN membership before logging measurements. The UE determines whether the serving cell belongs to a PLMN in the plmn-IdentityList configured in the logged MDT configuration before collecting measurements. This pre-check prevents incorrect measurements from being logged in the first place, thereby maintaining reliability while avoiding the need for post-processing filtering.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the UE checks PLMN membership before logging measurements, then the reliability of measurement reporting improves, but the device complexity increases due to additional verification steps

Engineering Contradiction:

Improvereliability of measurement reportingVSAvoidcomplexity of measurement handling

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies self-service by utilizing information that the UE already possesses - the plmn-IdentityList is configured in the UE as part of the logged MDT configuration. The UE uses its own stored PLMN identity information to perform the membership check, rather than requiring additional network assistance or complex external verification mechanisms. This keeps the complexity manageable while ensuring reliable measurement reporting.

Inventive Principle:

Principle #25Self-service

3Manufacturing precision

If the UE filters measurements by PLMN identity, then the purity of measurement data improves, but the loss of information increases by excluding valid measurements from allowed PLMNs

Engineering Contradiction:

Improvepurity of measurement dataVSAvoidloss of measurement data

Core Design Contradiction:

Manufacturing precisionVSLoss of information

Solution Approach 1:

The patent applies feedback by using the plmn-IdentityList configuration as a reference standard against which to validate each serving cell's PLMN membership. The UE continuously refers back to this configured list to determine whether to log measurements from the current serving cell. This feedback mechanism ensures that only measurements from authorized PLMNs are included, maintaining data purity without arbitrary exclusion of valid measurements.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12598497B2Radio network node, user equipment and methods performed therein

Publication Date: 2026.04.07 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

Embodiments herein relate to a method performed by a UE (10) for handling one or more measurements in a wireless communications network. The UE (10) logs, when one or more conditions are fulfilled, a measurement associated to a last serving cell after entering an any cell-selection state, wherein the one or more conditions comprise, the last serving cell belongs to a PLMN, said PLMN is configured in the UE (10) in a list of PLMN identities in a logged MDT configuration.