Inter-RAT Measurement Reporting for Mobile Handover Continuity
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Solution Overview
Problem
In mobile telecommunications, when a device is in cellular preferred mode, it fails to report Generic Access Network (GAN) cells during inter-radio access technology measurement requests, leading to potential call drops due to unavailability of 2G cells and inability to handover to GAN cells, as existing strategies only report 2G or GAN cells but not both simultaneously.
Innovation Solution
A method and apparatus that enable a mobile device to report both 2G and GAN cells during Event 3A measurement reports, even when in cellular preferred mode, by including GAN cells in the measurement report when 2G cells satisfy the triggering condition, allowing for potential handover to GAN if 2G handover fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile device reports only 2G cells during Event 3A measurement reports in cellular preferred mode, then the device follows existing strategy and maintains simple reporting logic, but handover to GAN cells cannot be initiated when 2G handover fails leading to call drops
Solution Approach 1:
The patent combines reporting of both 2G cells and GAN cells in the same Event 3A measurement report, rather than choosing one or the other. This merging approach allows the network to receive comprehensive information about available target cells for handover, enabling it to attempt handover to GAN cells if 2G handover fails, thereby preventing call drops while maintaining cellular preferred mode operation.
2Adaptability or versatility
If the mobile device reports both 2G and GAN cells during Event 3A measurement reports, then handover to GAN becomes possible when 2G handover fails, but the device deviates from existing strategy and increases reporting complexity
Solution Approach 1:
The measurement reporting mechanism is enhanced to serve multiple functions simultaneously: it continues to report 2G cells for traditional handover while also incorporating GAN cell information to enable alternative handover paths. This multi-functionality allows the same Event 3A reporting structure to support both conventional and GAN handover scenarios without requiring separate reporting mechanisms.
3Device complexity
If the mobile device does not report GAN cells in cellular preferred mode, then reporting logic remains simple, but the network lacks information to attempt GAN handover when 2G handover fails resulting in call drops
Solution Approach 1:
The patent implements preliminary reporting of GAN cell information in the Event 3A measurement report, so that the network has advance knowledge of available GAN target cells before handover decisions need to be made. This preliminary action ensures that when 2G handover fails, the network can immediately attempt GAN handover without delay, preventing call drops while keeping device complexity manageable.
Data Source
AI summary
Apparatus and a method are described for handling inter-radio access technology measurement reports in a radio telecommunications device, the device being operable with a first cellular radio access technology (e.g. UTRAN, E-UTRAN), GERAN and Generic Access Network, the radio telecommunications device being capable of adopting a cellular preferred mode. The method comprises, in the radio telecommunications device, when the radio telecommunications device is in cellular preferred mode and operating with the first cellular radio access technology and the radio telecommunications device is registered with a Generic Access Network Controller that operates as a GERAN network component, and a quality of a signal from the first cellular radio access technology is below a certain threshold and a quality of a signal from the GAN is above a certain threshold and a request has been received to send an inter-RAT measurement report, generating inter-radio access technology measurements and, when there is at least one GERAN cell that satisfies a triggering condition, transmitting a measurement report in respect of the GERAN cell(s) and a measurement report in respect of the generic access network.