Uplink Control Channel Format Switching for Coverage
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Solution Overview
Problem
In future radio communication systems, the quality of the uplink control channel deteriorates due to the use of multiple PUCCH formats with different durations and bit capacities, leading to inadequate coverage for user terminals with limited range.
Innovation Solution
A user terminal is equipped with a transmitting section for uplink control information using both short and long PUCCH formats, and a control section that adjusts the PUCCH format based on fallback information received from the radio base station to maintain channel quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple PUCCH formats with different durations and bit capacities are supported, then the adaptability of the uplink control channel is improved, but the quality and coverage of the channel deteriorates
Solution Approach 1:
The patent implements dynamic switching between different PUCCH formats based on fallback indication information. The terminal device selects between first PUCCH format (short duration) and second PUCCH format (long duration) according to real-time channel conditions and fallback indicators, making the system adaptive while maintaining reliability through conditional format selection rather than simultaneous support of all formats
Solution Approach 2:
The patent changes the duration parameter of the PUCCH format based on fallback indication information. When fallback is indicated, the terminal switches to a PUCCH format with a different duration (typically longer duration for better coverage), thereby adjusting the channel parameters to maintain quality while supporting multiple operational modes
2Loss of time
If a short PUCCH format is used, then the transmission time is reduced, but the coverage and reliability deteriorate
Solution Approach 1:
The patent dynamically adjusts PUCCH duration based on fallback indication information and channel conditions. The terminal switches between short PUCCH format (1-2 symbols) and long PUCCH format (4-14 symbols) according to real-time needs, achieving both fast transmission when conditions permit and extended coverage when required
3Reliability
If a long PUCCH format is used, then the coverage is improved, but the transmission time increases
Solution Approach 1:
The patent implements dynamic selection between long and short PUCCH formats based on fallback indication information. The terminal uses long PUCCH format (4-14 symbols) only when fallback is indicated and coverage is problematic, otherwise using short format for faster transmission, thereby optimizing the trade-off between coverage and transmission time
Data Source
AI summary
A user terminal according to the present invention includes: a transmitting section that transmits uplink control information (UCI) using an uplink control channel of a first duration and/or an uplink control channel of a second duration longer than the first duration; a receiving section that receives information related to fallback of the uplink control channel; and a control section that controls a format of the uplink control channel to be used to transmit the UCI, based on information related to the fallback.