UE URA Update Procedure for Wireless Synchronization

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Solution Overview

Problem

In UMTS mobile telecommunications systems, there is a synchronization issue between UTRAN and UE regarding URA identity when a UE transitions to the URA_PCH state, leading to potential miscommunication and inability for UTRAN to contact the UE due to lack of explicit URA identity in RRC messages.

Innovation Solution

The UE initiates a URA update procedure by sending a URA Update message with the cause set to 'change of URA' when transitioning to URA_PCH state without explicit URA identity in the RRC message, ensuring UTRAN is aware of the UE's current URA, even if SIB2 is not yet acquired or ambiguous.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the UE transitions to URA_PCH state without explicit URA identity in RRC message, then the device complexity is reduced and energy consumption is lowered, but the synchronization between UTRAN and UE deteriorates leading to potential miscommunication

Engineering Contradiction:

Improvemessage structure complexityVSAvoidUTRAN-UE synchronization

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The UE performs a URA update procedure proactively when transitioning to URA_PCH state without explicit URA identity. By initiating the URA update message transmission before any potential communication issues arise, the UE ensures that UTRAN has the correct URA information in advance, preventing desynchronization while maintaining the simplified message structure.

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If the UE waits to acquire SIB2 before determining URA identity, then the measurement precision of URA information is improved, but the loss of time increases due to delayed URA update

Engineering Contradiction:

ImproveURA identity accuracyVSAvoidURA update delay

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The UE transmits the URA update message with available information rather than waiting for complete SIB2 acquisition. This partial action approach allows the URA update to proceed with the information currently available, reducing time loss while maintaining sufficient accuracy for network operations. The UE can update URA information incrementally as more precise data becomes available.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentEP2418912B1Method and apparatus for handling URA information for a wireless communication device

Publication Date: 2019.10.09 BLACKBERRY LTD

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AI summary

A method and apparatus for handling URA information for a wireless communication device are disclosed.