UE Measurement Reporting Prioritization for Cell Reselection
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Solution Overview
Problem
Existing mobile communications systems face challenges in efficiently reporting measurement results, particularly in the CELL_FACH state, where cell reselection measurements are affected by the lack of a unified reporting solution across intra-frequency, inter-frequency, and inter-system measurements, leading to potential operation failures during redirection, handover, or cell change operations.
Innovation Solution
A method and apparatus that enable a user equipment (UE) to receive report indications and additional frequency information from a radio network controller, allowing for the generation and prioritization of measurement results across different measurement types, which are then sent using uplink signaling messages, thereby facilitating more efficient cell selection or reselection decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the radio network controller specifies a target frequency or cell during redirection, handover, or cell change operation without referencing real-time signal quality, then the operation can be executed quickly, but the operation may fail due to poor signal quality of the target cell or frequency
Solution Approach 1:
The UE performs measurement and evaluation of target cell signal quality before the redirection, handover, or cell change operation is executed. The UE autonomously determines whether to execute the operation based on predefined criteria comparing measured signal quality against thresholds, preventing operations that would likely fail due to poor signal quality.
Solution Approach 2:
The UE provides feedback to the radio network controller about the actual signal quality of the target cell or frequency. This feedback loop enables the controller to adjust future redirection, handover, or cell change decisions based on real-time measurement data, improving the reliability of these operations over time.
2Loss of information
If the UE reports all measurement results for intra-frequency, inter-frequency, and inter-system measurements, then the radio network controller can make better decisions, but the reporting complexity and message size increase
Solution Approach 1:
The patent applies different reporting rules to different measurement types based on their local characteristics and importance. Event-triggered reporting is applied to inter-frequency and inter-system measurements with specific event criteria, while periodic reporting is used for intra-frequency measurements. This differentiated approach ensures critical information is reported while reducing unnecessary reporting overhead.
Solution Approach 2:
The measurement reporting is segmented into different types (event-triggered and periodic) with different reporting criteria and formats. Event-triggered reporting captures specific significant events, while periodic reporting provides continuous monitoring data. This segmentation allows the system to report comprehensive information in an organized, manageable manner that reduces overall reporting complexity.
3Measurement precision
If the UE executes cell reselection measurement on all frequencies, then the UE can find the best cell, but the measurement time and energy consumption increase
Solution Approach 1:
The UE performs measurements on a selected subset of frequencies rather than all available frequencies. By applying event-triggered reporting criteria and prioritizing measurements based on configuration parameters and current signal conditions, the UE achieves sufficient measurement precision for cell reselection without the excessive time and energy cost of measuring every possible frequency.
Data Source
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AI summary
Embodiments of the present invention provide a method and an apparatus for implementing a report measurement and reporting a measurement result. According to the embodiments of the present invention, a report measurement can be implemented between a radio network controller and a user equipment in a CELL_FACH state by using a current MC message and a current MR message; and in a process of implementing the report measurement, coordination between the report measurement and a cell reselection measurement executed by the user equipment can be implemented to minimize an impact of the report measurement on the cell reselection measurement. In addition, according to the embodiments of the present invention, a user equipment can report information such as cell selection or reselection measurement results to a radio network controller according to a requirement of the radio network controller; and the UE can specify a reporting precedence order for various measurement types including inter-system measurement, and may preferentially report cell selection or reselection measurement results according to specific reporting priorities to accommodate a limitation on a size of an uplink signaling message.