PUCCH Resource Selection for Accurate UCI Identification
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Solution Overview
Problem
In future radio communication systems such as LTE Rel. 15 and 5G, uplink control channels (PUCCH) may not be accurately identified by the network due to improper transmission.
Innovation Solution
The user terminal selects appropriate PUCCH resources based on UCI payload size and uses specific PUCCH formats and cyclic shifts to ensure accurate transmission of UCI, employing methods like maximum likelihood detection for network decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the user terminal uses existing PUCCH formats for transmitting UCI, then the transmission structure is simple, but the network cannot accurately identify the UCI in future radio communication systems
Solution Approach 1:
The patent changes the fundamental parameters of PUCCH transmission by introducing format 2 with DFT-s-OFDM modulation instead of traditional OFDM, and by modifying the resource allocation parameters to support variable payload sizes. This enables accurate UCI identification while maintaining practical implementation complexity through standardized parameter modifications.
Solution Approach 2:
The patent implements dynamic PUCCH resource selection based on UCI payload size, where the terminal dynamically determines the appropriate PUCCH format and resource from multiple configured resources. This dynamic adaptation ensures reliable UCI transmission under varying conditions while managing complexity through algorithmic decision-making.
2Measurement precision
If the network uses maximum likelihood detection for decoding PUCCH, then the decoding accuracy is improved, but the network processing complexity increases
Solution Approach 1:
The patent replaces complex iterative decoding mechanisms with maximum likelihood detection, which provides a more direct and computationally efficient approach to UCI decoding. This substitution maintains high decoding accuracy while reducing the processing burden on network equipment through mathematically optimal but computationally lighter methods.
3Productivity
If the user terminal transmits UCI using traditional OFDM modulation, then the transmission is compatible with existing systems, but the spectral efficiency is insufficient for future radio communication requirements
Solution Approach 1:
The patent adopts DFT-s-OFDM modulation, which can be viewed as a transformed version of traditional OFDM that maintains backward compatibility while improving spectral efficiency. The DFT-s-OFDM structure copies the essential characteristics of OFDM (cyclic prefix, subcarrier modulation) while adding beneficial properties like reduced peak-to-average power ratio and improved spectral containment.
Data Source
Figure 1
Figure 2A~2D
Figure 3A~3B
AI summary
In future radio communication systems, an uplink control channel will be transmitted properly. A user terminal comprising, a receiving section that receives at least one downlink assignment, and receives at least one downlink shared channel scheduled by the at least one downlink assignment, and a control section that controls transmission of a delivery acknowledgment signal, by using at least one of an uplink control channel format and mapping of the delivery acknowledgment signal, associated with at least one of whether or not configuration for using a dynamic delivery acknowledgment signal codebook for the at least one downlink shared channel is configured, the number of bits of the delivery acknowledgment signal in response to the at least one downlink shared channel, whether or not the at least one downlink assignment is transmitted by one frequency resource, and the number of codewords for each downlink shared channel.