Uplink Control Information Transmission Adaptation
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Solution Overview
Problem
In future radio communication systems supporting both DFT-spreading OFDM and CP-OFDM waveforms, the existing control methods for UCI transmission may not ensure adequate coverage, particularly when CP-OFDM waveform is used, leading to potential transmission failures.
Innovation Solution
A user terminal is designed with a transmission section that controls UCI based on the waveform of the PUSCH or indication information from higher layer signaling and DCI, allowing for appropriate UCI transmission by selecting between short and long PUCCH formats depending on the PUSCH waveform and indication information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UCI transmission is controlled based on existing LTE methods using PUCCH with CP-OFDM waveform, then multi-carrier waveform support is achieved, but coverage balance deteriorates due to higher PAPR
Solution Approach 1:
The patent applies local quality by making the UCI transmission method adaptive to the specific waveform being used. When DFT-spreading OFDM is detected, the terminal uses PUCCH transmission; when CP-OFDM is detected, it uses PUSCH transmission. This localized adaptation ensures each waveform type maintains its coverage characteristics while supporting multiple waveform formats in the same system.
Solution Approach 2:
The patent implements dynamics by making the UCI transmission mechanism flexible and changeable based on waveform conditions. The terminal dynamically selects between PUCCH and PUSCH transmission modes according to the detected waveform type, allowing the system to adapt to varying channel conditions and waveform characteristics rather than using a fixed transmission method.
2Adaptability or versatility
If PUCCH with CP-OFDM waveform is used for UCI transmission, then waveform versatility is improved, but transmission reliability deteriorates due to PAPR increase
Solution Approach 1:
The patent uses waveform detection as an intermediary mechanism that mediates between the available waveform options and the appropriate UCI transmission method. The detection result acts as a bridge that determines whether to use PUCCH or PUSCH, ensuring that the higher PAPR of CP-OFDM does not directly translate to poor UCI transmission reliability.
Solution Approach 2:
The patent changes the transmission parameter (PUCCH vs PUSCH) based on the waveform parameter (DFT-spreading OFDM vs CP-OFDM). This parameter adaptation ensures that the transmission method matches the waveform characteristics, preventing the PAPR issue of CP-OFDM from degrading UCI transmission reliability while maintaining waveform versatility.
3Adaptability or versatility
If existing LTE UCI control method is applied to future systems with both waveforms, then system compatibility is maintained, but UCI transmission performance deteriorates
Solution Approach 1:
The patent makes the UCI transmission system universal by enabling it to handle multiple waveform types through a unified detection and selection mechanism. The same terminal apparatus can seamlessly switch between PUCCH-based transmission for DFT-spreading OFDM and PUSCH-based transmission for CP-OFDM, providing multi-functional capability while maintaining good transmission reliability for each waveform type.
Data Source
AI summary
The present invention is designed so that, when a CP-OFDM waveform is supported in the UL in addition to DFT-spreading OFDM waveform, transmission of UCI can still be controlled adequately. According to the present invention, a user terminal has a transmission section that transmits uplink control information (UCI), and a control section that controls transmission of the UCI based on a waveform of an uplink (UL) data channel or based on indication information provided via higher layer signaling and/or downlink control information (DCI).