DMRS Base Sequence Switching for Short PUCCH UCI Multiplexing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In future radio communication systems, frequency-division-multiplexing of UCI and DMRS in the short PUCCH leads to improper generation of the DMRS base sequence, resulting in transmission issues.
Innovation Solution
A user terminal controls the generation of DMRS base sequences by switching between pseudo-random sequences and CAZAC sequences based on the sequence length, ensuring proper transmission of frequency-division-multiplexed UCI and DMRS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UCI and DMRS are frequency-division-multiplexed in the short PUCCH, then the transmission efficiency is improved, but the base sequence generation becomes improper
Solution Approach 1:
The patent changes the parameter of sequence type selection based on the sequence length. When the sequence length is less than 36, a pseudo-random sequence is used instead of a CAZAC sequence. This parameter change resolves the generation issue while maintaining FDM capability between UCI and DMRS in short PUCCH.
2Reliability
If CAZAC sequences are used for DMRS base sequence generation, then the sequence generation is proper, but the design load increases
Solution Approach 1:
The patent introduces a parameter-based selection mechanism where the sequence length determines the sequence type. This avoids the need to design new CAZAC sequence tables by utilizing existing pseudo-random sequences for shorter lengths, thereby reducing design complexity while maintaining reliability.
3Length of moving object
If the sequence length is short, then the short PUCCH format is achieved, but the base sequence cannot be generated properly
Solution Approach 1:
The patent establishes a parameter threshold (sequence length of 36) that triggers a change in sequence type. For sequence lengths below this threshold, pseudo-random sequences are used instead of CAZAC sequences, ensuring proper generation while maintaining the short PUCCH format requirements.
Data Source
Figure 1A~1B
Figure 2A~2D
Figure 3
AI summary
According to one aspect of the present invention, a user terminal has a transmitting section that frequency-division-multiplexes and transmits a reference signal that is generated based on a base sequence, with uplink control information, and a control section that controls switching between a first sequence and a second sequence that are used to generate the base sequence, based on a sequence length of the base sequence. By this means, the reference signal that is frequency-division-multiplexed with the uplink control information can be transmitted properly.