Mobile Device Measurement Gap Request for Inter-RAT Handover
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Solution Overview
Problem
In wireless communication systems, mobile devices face challenges in determining signal quality for handovers due to the lack of guaranteed idle time for measurements across different frequencies and technologies, leading to data loss and inefficient resource utilization.
Innovation Solution
A method where user equipment requests and schedules a measurement gap from the network, allowing it to perform inter-frequency and inter-RAT measurements without data transmission, by indicating a channel quality threshold and utilizing a CQI report to request a gap, enabling the network to optimize scheduling and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the network dynamically schedules downlink data transmissions to user equipment, then data transmission efficiency is improved, but the user equipment has no guaranteed idle time to perform measurements on other frequencies and technologies
Solution Approach 1:
The network proactively schedules measurement gaps in advance before the UE needs to perform measurements. By predicting when measurement activities are needed and pre-allocating idle time slots, the network ensures measurement opportunities are available without disrupting the overall dynamic scheduling efficiency. This preliminary planning resolves the contradiction by preparing the system ahead of time rather than reacting when conflicts arise.
Solution Approach 2:
The measurement gap scheduling is made dynamic and adaptive rather than fixed. The network can adjust the timing, duration, and frequency of measurement gaps based on current traffic conditions, UE mobility patterns, and measurement requirements. This dynamic approach allows the system to optimize both data transmission efficiency and measurement opportunities in real-time, resolving the contradiction between continuous data transmission and periodic measurement needs.
2Measurement precision
If the user equipment performs measurements on other frequencies and technologies, then handover decision accuracy is improved, but data packets arriving during measurement periods are lost
Solution Approach 1:
The network acts as an intermediary by introducing measurement gaps as dedicated idle time slots. During these gaps, the UE is explicitly instructed to stop receiving downlink data and instead perform measurements. This intermediary mechanism separates the measurement activity from continuous data transmission, ensuring measurements can be performed accurately without data loss, while the network maintains control over when these gaps occur to minimize impact on overall throughput.
Solution Approach 2:
The network schedules measurement gaps in advance before the UE needs to perform measurements. By predicting when measurement activities are needed and pre-allocating idle time slots, the network ensures measurement opportunities are available without disrupting the overall dynamic scheduling efficiency. This preliminary planning resolves the contradiction by preparing the system ahead of time rather than reacting when conflicts arise.
3Productivity
If the network controls measurement gap scheduling centrally, then resource allocation is optimized, but the system complexity and signaling overhead increase
Solution Approach 1:
The measurement gap scheduling function is segmented and distributed rather than entirely centralized. While the network maintains overall control and optimization capability, specific scheduling decisions can be made locally at the UE based on pre-configured rules and parameters provided by the network. This segmentation reduces the signaling overhead and processing complexity at the network center while maintaining optimized resource allocation through coordinated control.
Data Source
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AI summary
Described herein are mechanisms and methods that facilitate preparation of inter- radio access technology (inter-RAT) and/or inter-freguency handover with respect to a mobile device (user equipment) . User equipment can indicate to a network servicing the user equipment that the user equipment desires to perform measurements with respect to a different frequency and/or different technology (506) . Data on the downlink channel can then be scheduled to ensure that data intended for the user equipment is not lost while the user equipment is performing the measurement (508) .