Terminal IC CSI Reporting Across Flexible UL-DL Subframes
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Solution Overview
Problem
Existing radio communication systems have not sufficiently examined technologies for efficiently utilizing channel state information.
Innovation Solution
A terminal device and integrated circuit that efficiently utilize channel state information by employing a radio communication method with specific configurations for uplink and downlink subframes, including flexible subframes and hybrid automatic repeat request timing, to enhance communication efficiency in a radio communication system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the terminal device supports both FDD and TDD operations, then the communication versatility is improved, but the device complexity increases due to separate RF chains and switches
Solution Approach 1:
The patent combines FDD and TDD operations into a single RF chain by merging the transmit and receive paths. The base station transmits FDD downlink signals and TDD downlink signals through the same RF chain, and the terminal device receives both types of signals through the same receive path, eliminating the need for separate RF chains and reducing device complexity while maintaining communication versatility
Solution Approach 2:
The RF chain is designed to perform multiple functions by handling both FDD and TDD operations universally. The same transmit path and receive path are used for both FDD transmit signals and TDD uplink signals, making the RF chain multi-functional and reducing the overall device complexity
2Reliability
If separate transmit and receive paths are used for FDD and TDD, then the signal isolation is improved, but the device complexity and power consumption increase
Solution Approach 1:
The patent merges the separate transmit and receive paths into a unified structure where the base station uses a single transmit path for both FDD and TDD signals, and the terminal device uses a single receive path for both FDD downlink and TDD downlink signals. This merging reduces device complexity while maintaining signal isolation through proper timing and frequency management
Solution Approach 2:
The system uses periodic time-division multiplexing where TDD uplink transmission occurs in specific time slots while FDD downlink transmission occurs in other time slots. This periodic action allows the same RF chain to handle different signal types at different times, maintaining signal isolation without requiring separate paths
3Productivity
If FDD and TDD are operated simultaneously with separate RF chains, then the communication efficiency is improved, but the power consumption increases
Solution Approach 1:
The patent merges FDD and TDD operations into a single RF chain, reducing the number of active components and power-consuming elements. The base station and terminal device both use unified transmit and receive paths, which reduces power consumption compared to maintaining separate RF chains for FDD and TDD operations
Solution Approach 2:
The system employs periodic time-division multiplexing where TDD uplink transmission occurs in specific time slots and FDD operations occur in other time slots. This allows the RF chain to be activated only when needed for specific transmissions, reducing overall power consumption while maintaining communication efficiency through continuous operation in different modes
Data Source
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AI summary
A mobile station device (1) includes a measurement unit (1059) that performs interference measurement to calculate channel state information in a first subframe set or a second subframe set to which a channel state information reference resource belongs. A subframe which is valid as the channel state information reference resource and corresponding to report of periodic channel state information is decided based on first UL-DL configuration and third UL-DL configuration. A subframe which is valid as the channel state information reference resource and corresponding to report of aperiodic channel state information is decided based on second UL-DL configuration.