PUCCH Sequence Transmission for Uplink Coverage and Detection
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Solution Overview
Problem
The challenge of maintaining adequate uplink coverage in NR systems, particularly at higher carrier frequencies, is exacerbated by larger path-loss and the use of non-coherent detection algorithms, which degrade performance due to undesirable cross-correlation properties in sequence-based PUCCH formats 1 and 3 when UCI payload is small.
Innovation Solution
Enhanced PUCCH transmission schemes involving modified sequence generation and scrambling for formats 1 and 3, along with non-coherent detection methods that eliminate DMRS, utilize orthogonal sequences and phase offsets, and partition symbols for improved coverage and detection performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sequence-based PUCCH formats 1 and 3 are used with non-coherent detection, then uplink coverage is improved, but detection performance degrades due to undesirable cross-correlation properties
Solution Approach 1:
The patent applies parameter changes by modifying the sequence generation parameters and cyclic shift values for PUCCH formats 1 and 3. Specifically, it defines new sequence generation rules with adjusted cyclic shifts and orthogonal cover codes to improve cross-correlation properties while maintaining non-coherent detection capability, thereby resolving the contradiction between coverage and detection performance
Solution Approach 2:
The patent introduces dynamic sequence selection and hopping mechanisms where the sequence and cyclic shift are determined based on UCI payload size and configured parameters. This dynamic adaptation allows optimization of cross-correlation properties for different payload conditions, improving detection performance while maintaining coverage benefits
2Reliability
If DMRS is eliminated for non-coherent detection, then sequence-based PUCCH performance is improved, but signal quality deteriorates
Solution Approach 1:
The patent introduces orthogonal cover codes and phase offsets as intermediary elements that mediate between the transmitted sequence and the detection process. These intermediaries enable non-coherent detection by providing reference information that improves signal quality estimation without requiring traditional DMRS, thus resolving the contradiction
Solution Approach 2:
The patent replaces the mechanical DMRS reference signal system with a sequence-based non-coherent detection mechanism using orthogonal cover codes and phase offsets. This substitution eliminates the need for separate reference signals while maintaining signal quality through mathematical properties of the sequences themselves
3Productivity
If UCI payload size is reduced, then PUCCH resource efficiency is improved, but detection accuracy degrades due to cross-correlation
Solution Approach 1:
The patent applies local quality by tailoring sequence generation and cyclic shift parameters specifically for small UCI payloads. It defines separate handling for different payload sizes (1-2 bits vs. 3-15 bits) with optimized parameters for each case, improving detection accuracy for small payloads while maintaining resource efficiency
Solution Approach 2:
The patent segments the PUCCH transmission into distinct parts with different sequence generation rules based on UCI payload size. It divides the parameter space into multiple segments (different cyclic shift sets, orthogonal cover code combinations) corresponding to different payload conditions, allowing optimized detection for each segment
Data Source
AI summary
Embodiments herein provide techniques for transmission of a physical uplink control channel (PUCCH) in a wireless cellular network. For example, transmission schemes are provided for sequence-based transmission of a PUCCH and/or to improve PUCCH coverage. User equipment (UE) may: determine uplink control information (UCI) pay load information for the PUCCH with a PUCCH format 1; determine a sequence for transmission of the PUCCH based on the UCI pay load information; and map the determined sequence to allocated resources for the PUCCH format 1 for transmission.