MDT Log Reporting via SRB2 Signaling Radio Bearer

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Solution Overview

Problem

Current methods for Minimization of Drive Tests (MDT) log retrieval in LTE systems do not clearly specify how to select the proper signaling radio bearer for transmitting MDT logs using the UEInformation procedure, leading to inefficiencies in network performance evaluation.

Innovation Solution

A method for a mobile communication device to receive a request message and determine if it requests an MDT log, then transmit the response message containing the MDT log on a properly selected signaling radio bearer, specifically using SRB2 when requested, ensuring accurate and efficient log retrieval.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the UEInformation procedure is used to retrieve MDT logs, then the log retrieval can be performed, but it is not clearly specified how to select the proper signaling radio bearer for transmission

Engineering Contradiction:

ImproveMDT log retrieval operationVSAvoidsignaling radio bearer selection complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent changes the parameter of signaling radio bearer selection by explicitly specifying SRB2 as the correct bearer for MDT log transmission. This resolves the ambiguity in the UEInformation procedure by defining a clear parameter (SRB2) for log retrieval operations.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces SRB2 as an intermediary signaling radio bearer specifically for MDT log transmission. This mediator element clarifies the communication path between UE and network for log retrieval, eliminating the uncertainty about which bearer should be used.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If MDT logs are transmitted on SRB1 using UEInformation procedure, then the procedure can be executed, but the log transmission may be inefficient or incorrect

Engineering Contradiction:

ImproveMDT log transmission efficiencyVSAvoidMDT log transmission accuracy

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent corrects the parameter error by specifying SRB2 instead of SRB1 for MDT log transmission. This parameter change ensures both the reliability and efficiency of log transmission, as SRB2 is the designated bearer for such operations.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts the potential harm of using the wrong bearer (SRB1) into a benefit by explicitly defining SRB2 as the correct choice. This clarification transforms the previous ambiguity into a clear, reliable transmission path.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Adaptability or versatility

If the signaling radio bearer selection is ambiguous, then the UEInformation procedure can be performed, but network performance evaluation is compromised

Engineering Contradiction:

ImproveUEInformation procedure flexibilityVSAvoidnetwork performance measurement accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent resolves the ambiguity by changing the parameter specification to explicitly use SRB2 for MDT log transmission. This ensures measurement precision in network performance evaluation while maintaining the flexibility of the UEInformation procedure.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS8571542B2Mobile communication device, service network, and methods for MDT log reporting

Publication Date: 2013.10.29 HTC CORP

AI summary

A mobile communication device and an associated method for MDT log reporting are provided. The method can be used in the mobile communication device which communicates with a service network through a first signaling radio bearer and a second signaling radio bearer. The method first receives a request message on the first signaling radio bearer from the service network, and then determines whether the request message requests for an MDT log. At last, the method transmits a response message containing the MDT log on the second signaling radio bearer to the service network when the request message requests for the MDT log.