Mobile Terminal LAI Mismatch Detection and Counter Logic

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Solution Overview

Problem

Existing systems and methods do not effectively handle mismatches between Location Area Identity (LAI) values received in broadcasted system information and those received during a Location Area Update (LAU) procedure, leading to unpredictable mobile terminal behavior and continuous battery drain due to repeated LAU procedures.

Innovation Solution

A method implemented in a mobile terminal to detect mismatches between LAI values, increment a counter, and update the SIM LAI value when the counter reaches a threshold, while avoiding removal of LAI values from forbidden lists, thereby preventing continuous LAU loops and battery drain.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the mobile terminal updates the LAI value in SIM with the received LAI value from LAU accept message, then the LAI value in SIM is updated, but the mobile terminal enters a continuous LAU loop causing battery drain

Engineering Contradiction:

ImproveLAI value synchronizationVSAvoidbattery drain

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies preliminary action by comparing the received LAI value with the broadcasted LAI value before updating the SIM. This pre-comparison prevents unnecessary updates that would trigger continuous LAU loops, thereby avoiding battery drain while ensuring proper LAI synchronization when needed.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback by continuously monitoring and comparing LAI values from different sources (received in LAU accept message versus broadcasted in system information). This feedback mechanism detects mismatches and prevents incorrect updates, stopping the continuous LAU loop that causes battery exhaustion.

Inventive Principle:

Principle #23Feedback

2Measurement precision

If the mobile terminal continuously performs LAU procedure to detect LAI mismatch, then the LAI mismatch can be detected, but resource wastage and battery drain occur

Engineering Contradiction:

ImproveLAI mismatch detectionVSAvoidresource wastage

Core Design Contradiction:

Measurement precisionVSLoss of energy

Solution Approach 1:

The patent performs the LAI comparison action beforehand, before initiating any LAU procedure. By comparing the received LAI with the broadcasted LAI in advance, the system can identify mismatches without needing to continuously perform full LAU procedures, thus detecting LAI mismatch while avoiding resource wastage.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Instead of performing complete LAU procedures continuously to detect LAI mismatch, the patent applies partial action by only comparing the LAI values. This partial comparison achieves the detection goal with minimal resource consumption, avoiding the excessive energy use of continuous full LAU cycles.

Inventive Principle:

Principle #16Partial or excessive action

3Ease of operation

If the mobile terminal removes LAI from forbidden list after successful registration, then the LAI is removed from forbidden list, but continuous LAU loops may occur due to identity mismatch

Engineering Contradiction:

Improveregistration procedureVSAvoidLAI identity consistency

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The patent uses feedback by comparing the received LAI value with the broadcasted LAI value before removing an LAI from the forbidden list. This feedback ensures that only consistent and valid LAI values are removed, preventing identity mismatches that could trigger continuous LAU loops while maintaining proper registration functionality.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent performs preliminary verification by comparing LAI values before allowing removal from the forbidden list. This pre-verification ensures that the LAI identity consistency is maintained, preventing future mismatches that would cause continuous registration attempts and LAU loops.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS9794751B1Method for avoiding resource wastage while detecting location identifiers mismatch

Publication Date: 2017.10.17 SAMSUNG ELECTRONICS CO LTD

AI summary

A method implemented by a processor included in a mobile terminal which is configured to communicate with a communication network, including receiving from a network a first location identifier value in broadcast system information, detecting at least one mismatch between the first location identifier value and a second location identifier value, the second location identifier value included in a location update accept message received from the network, incrementing a value of a counter based on the detected at least one mismatch, determining that the value of the counter reaches a threshold, the threshold being a maximum number of the detected at least one mismatch between the first location identifier value and the second location identifier value, and updating the first location identifier value in a Subscriber Identity Module (SIM) may be provided.