Uplink Control Channel Code Rate Adaptation
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Solution Overview
Problem
Legacy LTE systems are not suitable for controlling the transmission of Uplink Control Information (UCI) when uplink control channels of varying durations are supported, as they only support channels of identical durations, leading to inadequate control over short and long PUCCH formats in future radio communication systems.
Innovation Solution
A user terminal is equipped with a reception section to receive code rate information for both short and long uplink control channels and a control section that adjusts UCI transmission based on the matching code rate for the specific channel format used, allowing for independent control of UCI transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If legacy LTE systems use a single code rate configuration for all uplink control channels, then the system structure remains simple, but the system cannot appropriately control UCI transmission when uplink control channels of different durations are supported
Solution Approach 1:
The patent segments the code rate configuration by separating it into channel-format-specific parameters. Different code rates (e.g., first code rate for short PUCCH, second code rate for long PUCCH) are configured independently for different uplink control channel formats, allowing appropriate control for each format while maintaining manageable complexity through structured configuration
Solution Approach 2:
The patent applies local quality by configuring different code rates for different uplink control channel formats based on their specific characteristics. Short PUCCH formats receive optimized code rates suited for their brief duration, while long PUCCH formats receive different code rates optimized for their extended duration, ensuring each channel type operates at optimal performance
2Adaptability or versatility
If legacy LTE systems use identical duration for all uplink control channels, then the control mechanism remains straightforward, but the system becomes unsuitable for future radio communication systems requiring varied channel durations
Solution Approach 1:
The patent introduces dynamics by enabling the system to adaptively select different code rates based on the actual uplink control channel format used for UCI transmission. The control section dynamically determines which code rate to apply based on channel duration and format, providing flexible operation while maintaining ease of use through automated selection
Solution Approach 2:
The patent changes key parameters by introducing format-specific code rates as configurable parameters. The system transitions from a static single code rate to dynamic parameters including first code rate for short channels, second code rate for long channels, and associated parameters like first/second maximum numbers of bits, allowing optimized performance across different channel durations
3Reliability
If the system supports multiple uplink control channel formats with different durations, then the system achieves better performance for varied communication needs, but the transmission control mechanism becomes inadequate
Solution Approach 1:
The patent applies preliminary action by pre-configuring appropriate code rates and maximum bit limits for each uplink control channel format before transmission occurs. The base station provides RRC signaling with first code rate, second code rate, first maximum number of bits, and second maximum number of bits in advance, enabling the user terminal to immediately apply the correct parameters without complex real-time decisions
Solution Approach 2:
The patent implements feedback mechanisms where the base station monitors uplink control channel usage and provides appropriate code rate configurations through RRC signaling. The system continuously adapts to transmission conditions by adjusting code rate parameters based on observed performance and network conditions, improving reliability while managing complexity through intelligent feedback loops
Data Source
AI summary
A user terminal according to the present invention includes: a reception section that receives each of information indicating a code rate for a first uplink control channel, and information indicating a code rate for a second uplink control channel having a longer duration than that of the first uplink control channel; and a control section that controls transmission of Uplink Control Information (UCI) based on a code rate indicated by the information matching an uplink control channel used for the transmission of the uplink control information.