Measurement Reference Cell Determination in Multi-Carrier Systems
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Solution Overview
Problem
Conventional wireless communication systems face difficulties in applying measurement methods across multiple component carriers, as it is unclear which carrier to use as a serving cell, and measurement configurations lack flexibility when adding or modifying carriers.
Innovation Solution
A mobile station apparatus determines a measurement reference cell based on reporting configurations linked to event triggering criteria, allowing for efficient measurement configuration management across multiple component carriers, and reports measurement results to the base station apparatus when specific criteria are met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If measurement methods from single-cell systems are applied to multi-component carrier systems, then the measurement process can be initiated, but it becomes unclear which carrier should be used as a serving cell for measurement evaluation
Solution Approach 1:
The patent assigns different roles (serving cell vs. non-serving cell) to different component carriers based on their specific characteristics and measurement configurations. Each carrier is evaluated locally against event triggering criteria, with the measurement reference cell determined by comparing measurement results against configured thresholds and offsets specific to each carrier's function and quality metrics.
Solution Approach 2:
The patent introduces event triggering criteria as an intermediary mechanism that mediates between multiple component carriers and the measurement reporting process. This intermediary layer evaluates measurement results against configured thresholds and determines which carrier should be reported, resolving the ambiguity of selecting a serving cell for measurement purposes.
2Adaptability or versatility
If measurement configurations are made flexible to accommodate adding or modifying carriers, then the system can adapt to changing network conditions, but the complexity of managing measurement configurations increases
Solution Approach 1:
The patent implements dynamic measurement configuration where event triggering criteria, thresholds, and offsets can be adjusted based on network conditions and carrier additions or modifications. The system dynamically adapts measurement parameters without requiring complete reconfiguration, allowing flexible carrier management while maintaining controlled complexity through standardized adjustment procedures.
3Productivity
If event triggering criteria are used for measurement reporting in multi-carrier systems, then measurement results can be efficiently reported when specific conditions are met, but determining the measurement reference cell becomes more complex
Solution Approach 1:
The patent pre-configures event triggering criteria, thresholds, and offsets for each component carrier before measurements are taken. This preliminary configuration establishes the rules for determining the measurement reference cell in advance, allowing efficient real-time evaluation without complex runtime decision-making, thus resolving the contradiction between reporting efficiency and determination complexity.
Data Source
AI summary
A communication system includes a terminal apparatus and a base station apparatus. The terminal apparatus communicates with a base station apparatus by carrier aggregation using a plurality of serving cells, where each of the plurality of serving cells has a different frequency. In addition, the terminal apparatus removes a measurement identity relevant to a serving cell of the plurality of serving cells based on that the serving cell was removed.