Mobile Device Inter-RAT Measurement Gap Adaptation
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Solution Overview
Problem
In wireless communication systems, particularly in 3G networks like UMTS, mobile devices face challenges in performing inter-RAT measurements due to insufficient idle time periods during high-speed data transfer, leading to potential service drops when moving closer to cell boundaries or experiencing deteriorating cell radio link quality.
Innovation Solution
A method where a mobile device receives inter-RAT measurement configuration information from the network and, upon meeting specific criteria such as deteriorating cell radio link quality, increases measurement time by reducing radio resource requirements, such as by reporting a lower Channel Quality Indicator (CQI) or downgrading HSDPA capabilities, to create measurement gaps for timely inter-RAT measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HSDPA high data rate operation is implemented with increased downlink timeslots, then data rate is improved, but idle time for inter-RAT measurement is reduced
Solution Approach 1:
The patent applies dynamics by making the timeslot allocation adaptive rather than fixed. The mobile device dynamically adjusts its HSDPA operation mode between high data rate mode (with fewer measurement gaps) and low data rate mode (with more measurement gaps) based on real-time channel quality conditions. This allows the system to optimize between data rate and measurement capability according to current network conditions.
Solution Approach 2:
The patent changes the parameter of timeslot allocation by modifying the HSDPA configuration based on channel quality indicators. When channel quality deteriorates, the system transitions to a lower data rate mode that allocates more timeslots for measurement purposes. This parameter change enables the system to maintain measurement accuracy while still providing acceptable data rates under varying conditions.
2Reliability
If measurement gaps are increased for reliable inter-RAT measurement, then measurement reliability is improved, but data transfer efficiency is reduced
Solution Approach 1:
The system dynamically adjusts the measurement gap configuration based on real-time channel quality assessment. When channel conditions are good, the device operates in high data rate mode with minimal measurement gaps, maximizing data transfer efficiency. When channel quality deteriorates, the system switches to low data rate mode with extended measurement gaps, ensuring reliable inter-RAT measurements. This dynamic adaptation resolves the contradiction between measurement reliability and data transfer efficiency.
Solution Approach 2:
The patent implements feedback mechanisms where the mobile device continuously monitors channel quality indicators and uses this information to adjust its operating mode. The feedback loop ensures that measurement gap configuration is optimized based on actual channel conditions, allowing the system to maintain both reliable measurements and efficient data transfer under varying network conditions.
3Productivity
If downlink timeslots are allocated for high data rate traffic, then data rate is improved, but measurement capability is reduced
Solution Approach 1:
The system dynamically switches between operational modes based on channel quality. In high data rate mode, the device allocates more timeslots for data transmission and fewer for measurement. In low data rate mode, the allocation reverses, providing more measurement opportunities. This dynamic mode switching allows the system to optimize the balance between data rate and measurement capability according to real-time conditions.
Solution Approach 2:
The patent changes the timeslot allocation parameter based on channel quality indicators. When channel quality is poor, the system transitions to a parameter configuration that prioritizes measurement capability over data rate. This parameter adjustment enables the device to maintain measurement capability even when operating at reduced data rates, resolving the contradiction between the two objectives.
Data Source
AI summary
A method at a mobile device for increasing measurement gaps to facilitate inter-radio access technology measurements is provided. The method at the mobile device: receiving inter-radio access technology (RAT) measurement configuration information from the network; when the device is actively connected, determining whether a triggering criterion is met, based on the received information; and if the triggering criterion is met, increasing the time available for measurements.