Inter-RAT Idle Roaming Timer for Mobile Handover Registration

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Solution Overview

Problem

Current mobile communication devices experience service disruptions and delayed registration during handovers from WCDMA or GSM to CDMA systems due to the need for power-up registration timers, which can lead to service continuity issues and decreased transmission success rates.

Innovation Solution

Implementing an Inter-RAT idle roaming method that uses a timer to measure a count period from the cut-off time of the initial service, allowing immediate CDMA service registration after the set period, thereby minimizing service disruptions and ensuring quick handovers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the mobile communication device uses the conventional power-up registration timer (T57m) method for handover from WCDMA to CDMA system, then the device can ensure proper registration procedure, but the service disruption period is extended and service continuity is compromised

Engineering Contradiction:

Improveregistration procedure reliabilityVSAvoidservice disruption period

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by starting the power-up registration timer immediately when the CDMA modem is activated into online mode, before the actual registration procedure begins. This allows the timer to expire and prepare the registration state in advance, so that when the registration is triggered, it can proceed immediately without waiting for timer expiration, thus reducing service disruption while maintaining reliable registration

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent maintains continuity of useful action by keeping the CDMA modem in online mode with the timer running in the background, rather than completely shutting down the registration function. The timer continues to count down and the registration capability remains active, ensuring that when handover is needed, the registration can occur immediately without full re-initialization, thereby reducing service interruption while ensuring proper registration

Inventive Principle:

Principle #20Continuity of useful action

2Speed

If the mobile communication device activates the CDMA modem immediately upon detecting CDMA service area, then the registration can be performed quickly, but the power consumption increases due to frequent modem activation

Engineering Contradiction:

Improvehandover speedVSAvoidpower consumption

Core Design Contradiction:

SpeedVSUse of energy by moving object

Solution Approach 1:

The patent applies dynamics by making the CDMA modem activation state changeable based on system conditions. The modem can be dynamically switched between offline and online modes depending on whether handover to CDMA is detected, while the power-up registration timer is dynamically adjusted - started immediately upon activation to ensure quick registration, or canceled if the modem remains offline. This dynamic approach enables fast handover when needed while minimizing power consumption during normal WCDMA operation

Inventive Principle:

Principle #15Dynamics

3Loss of energy

If the mobile communication device maintains the CDMA modem in offline mode during WCDMA service, then the power consumption is reduced, but the handover to CDMA system is delayed

Engineering Contradiction:

Improvepower consumptionVSAvoidhandover delay

Core Design Contradiction:

Loss of energyVSLoss of time

Solution Approach 1:

The patent applies preliminary action by pre-configuring the power-up registration timer to start immediately when the CDMA modem is activated during handover. This preliminary timer setup ensures that the registration procedure can begin without delay once the modem is online, compensating for the previous offline state and reducing overall handover time while maintaining low power consumption during normal WCDMA service

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS7796553B2Method and apparatus for efficiently managing power-up timer for high-speed inter-radio access technology handover in mobile communication device

Publication Date: 2010.09.14 PANTECH CORP

AI summary

A method of an Inter-RAT handover between a WCDMA service and a CDMA service of a mobile communication device having a WCDMA modem and a CDMA modem, the method including: performing the WCDMA service in a WCDMA network; move from the WCDMA network to a CDMA network; determining an Inter-RAT idle roaming to the CDMA network; measuring, with a timer, a count period from a cut-off time of the WCDMA service according to the determination of the Inter-RAT idle roaming; and performing CDMA service registration according to the Inter-RAT idle roaming immediately after the cut-off time of the WCDMA service or after the count period set in the timer.