Uplink Control Channel Format Selection for UCI Transmission
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Solution Overview
Problem
Future radio communication systems face challenges in adequately controlling uplink control information (UCI) transmission due to the introduction of shorter duration UL control channels with multiple formats, which may lead to improper control of UCI using these channels.
Innovation Solution
A user terminal determines the format of the uplink control channel for UCI transmission from multiple formats, including frequency-division-multiplexed and time-division-multiplexed configurations, based on UCI type, payload, and physical layer signaling to ensure proper control and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If multiple formats are supported for UL control channels with shorter duration, then the system can achieve lower latency and higher productivity, but the device complexity increases and reliability decreases due to difficulty in controlling UCI transmission
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the multiplexing method (frequency-division or time-division) based on UCI payload size and channel conditions. The control section selects different formats (first format with FDM, second format with TDM) according to varying parameters such as payload size, enabling the system to adapt to different latency requirements while maintaining manageable complexity through standardized format selection criteria
2Adaptability or versatility
If multiple formats are supported for UL control channels, then the system can achieve higher adaptability and versatility, but the reliability of UCI transmission control deteriorates
Solution Approach 1:
The patent implements dynamics by enabling the control section to dynamically switch between different PUCCH formats based on real-time conditions including UCI payload size, channel state, and latency requirements. The system transitions between first format (FDM-based) for smaller payloads and second format (TDM-based) for larger payloads, providing adaptability while ensuring reliable control through condition-based format selection that prevents improper UCI transmission control
3Quantity of substance
If frequency-division multiplexing is used for UCI and reference signal, then the capacity increases, but the complexity of format management increases
Solution Approach 1:
The patent applies segmentation by dividing the UCI transmission into distinct formats: first format using frequency-division multiplexing for scenarios requiring higher capacity, and second format using time-division multiplexing for scenarios where simplicity is preferred. The control section segments the decision space based on payload size thresholds, managing format complexity through clear segmentation criteria while enabling capacity optimization when FDM is selected
Data Source
AI summary
The present invention is designed to adequately control the transmission of uplink control information (UCI) using UL control channels. According to the present invention, a user terminal has a transmission section that transmits uplink control information (UCI), and a control section that determines a format of an uplink (UL) control channel that is used to transmit the UCI, from a plurality of formats, including a first format, in which the UCI and a reference signal are frequency-division-multiplexed, and a second format, in which the UCI and the reference signal are time-division-multiplexed.