Terminal Apparatus Cell Measurement Reference Determination
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Solution Overview
Problem
In a communication system with heterogeneous networks, terminal apparatuses face difficulties in uniquely determining a reference cell among multiple serving cells connected at the same frequency, and base stations struggle to interpret measurement reports accurately.
Innovation Solution
The terminal apparatus and base station apparatus employ a method to determine evaluation object cells and neighbor cells based on measurement configurations, using primary cells, specified cells, or cells currently performing communication, to facilitate accurate measurement evaluations and reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a terminal apparatus connects to multiple serving cells at the same frequency in a heterogeneous network, then communication flexibility and network capacity are improved, but the terminal apparatus cannot uniquely determine a reference cell for measurement events
Solution Approach 1:
The patent applies local quality by differentiating the role of each serving cell through the evaluationObjectCell indicator. Instead of treating all serving cells uniformly, the system designates one specific serving cell as the evaluation object cell for each measurement event, allowing precise local identification of the reference cell among multiple serving cells at the same frequency.
Solution Approach 2:
The evaluationObjectCell indicator acts as an intermediary element that bridges the gap between multiple serving cells and the measurement event evaluation. This indicator explicitly identifies which serving cell should be used as the reference, mediating the relationship between the plurality of serving cells and the measurement procedures.
2Productivity
If multiple serving cells operate at the same frequency to increase network capacity, then system throughput is improved, but the base station cannot correctly interpret measurement event reports from the terminal apparatus
Solution Approach 1:
The base station uses the evaluationObjectCell indicator to locally identify which specific serving cell the measurement results refer to. This allows the base station to correctly interpret measurement reports even when multiple serving cells operate at the same frequency, preventing information loss in the measurement reporting process.
3Adaptability or versatility
If the terminal apparatus uses multiple serving cells with different configurations, then network adaptability is improved, but the terminal apparatus cannot discriminate between serving cells and neighbor cells
Solution Approach 1:
The patent applies local quality by designating specific serving cells as evaluation object cells, which creates a clear distinction between serving cells (particularly the evaluation object cell) and neighbor cells. This local differentiation enables the terminal apparatus to properly discriminate between serving and neighbor cells even in heterogeneous networks with different cell configurations.
Data Source
AI summary
Provided is a technique related to a terminal apparatus, a base station apparatus, a communication system, a control method, and an integrated circuit which perform cell measurements efficiently. In a case where a measurement event which sets frequencies of a plurality of serving cells as a measurement object is configured by measurement configuration, the terminal apparatus determines each of an evaluation object cell and a neighbor cell from the plurality of serving cells at a frequency of the measurement object based on the measurement configuration configured by the base station apparatus, and evaluates the measurement event by using a measurement result of the evaluation object cell.