Terminal Device Channel State Information Reference Resource Determination
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Solution Overview
Problem
The existing wireless communication systems, particularly in LTE, have not adequately addressed the efficient use and reporting of channel state information, which is crucial for optimizing communication in TD-LTE systems.
Innovation Solution
A terminal device and method that derive and report a channel quality indicator based on a defined channel state information reference resource, ensuring efficient communication by adhering to specific criteria for subframe validity, interference measurement, and uplink-downlink configuration detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If channel state information is used for optimizing communication in TD-LTE systems, then communication efficiency is improved, but the complexity of determining valid subframes and reporting channel quality indicators increases
Solution Approach 1:
The patent changes the parameter of subframe validity determination by introducing specific criteria (criterion 1-4) that define when a subframe is considered valid for channel quality indicator reporting. This resolves the complexity by providing clear, actionable rules for determining valid subframes based on uplink-downlink configuration and subframe type, enabling efficient communication while managing device complexity through standardized parameter changes.
2Productivity
If periodic reporting of channel state information is implemented, then communication optimization is improved, but the time required for processing and reporting increases
Solution Approach 1:
The patent applies preliminary action by pre-determining which subframes are valid for channel quality indicator reporting based on the uplink-downlink configuration and subframe type before the actual reporting occurs. This allows the terminal device to prepare and identify valid subframes in advance, reducing the time required during periodic reporting cycles while maintaining communication optimization through consistent, pre-planned measurement opportunities.
3Measurement precision
If multiple criteria for subframe validity are applied, then measurement precision is improved, but the difficulty of detecting and measuring channel state information increases
Solution Approach 1:
The patent segments the complex task of channel state information measurement into distinct, manageable parts by dividing subframes into different types (first type and second type subframes) with specific validity criteria. This segmentation allows the terminal device to systematically evaluate each subframe type separately, improving measurement precision through structured analysis while reducing the overall difficulty by breaking down the detection process into simpler, criterion-based steps.
Data Source
AI summary
In a wireless communication system in which channel state information is used, a mobile station device and a base station device efficiently communicates with each other. A subframe in a certain serving cell that satisfies references which include at least a reference (i) is regarded as being valid as a CSI reference resource. In the reference (i), in a case where information which is signaled on a PDCCH and that indicates a UL-DL configuration is detected, the UL-DL configuration is given by the information. In the reference (i), in a case where the information is not detected, the UL-DL configuration is the same as a UL-DL configuration that is indicated by a higher layer parameter. The reference (i): the subframe is a subframe that is indicated as, a downlink subframe or a special subframe, by the UL-DL configuration.