UCI Multiplexing on Multiple PUSCHs in 5G NR
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Solution Overview
Problem
In next-generation wireless communication systems, there is a challenge in multiplexing uplink control information (UCI) on physical uplink shared channels (PUSCH) due to conflicting timing specifications and frequency hopping, leading to issues with UCI mapping and piggybacking, especially when PUSCH spans one or two symbols.
Innovation Solution
The proposed solution involves defining specific rules for UCI multiplexing and piggybacking on multiple PUSCHs, including determining the component carrier index and selecting the appropriate PUSCH based on duration and frequency hopping conditions, allowing UCI to be piggybacked on grant-based or configured grant PUSCHs, and dropping UCI when certain duration criteria are not met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UCI is multiplexed on PUSCH with short duration (1-2 symbols), then UCI transmission efficiency is improved, but mapping reliability deteriorates due to insufficient time resources
Solution Approach 1:
The patent determines the symbol duration of PUSCH before multiplexing UCI, and preliminarily identifies suitable PUSCH resources that meet minimum duration requirements. This preliminary assessment ensures that UCI is only multiplexed on PUSCH with sufficient time resources (greater than 1 symbol), preventing mapping reliability issues while maintaining transmission efficiency when conditions are favorable.
2Adaptability or versatility
If multiple PUSCH resources are available for UCI multiplexing, then transmission flexibility is improved, but resource selection complexity increases
Solution Approach 1:
The patent segments the resource selection process into distinct evaluation stages: first filtering PUSCH resources by minimum symbol duration, then applying frequency hopping conditions, and finally selecting from remaining candidates. This segmented approach breaks down the complex multi-criteria selection into manageable steps, maintaining flexibility while reducing overall selection complexity.
Solution Approach 2:
The patent performs preliminary filtering of PUSCH resources based on symbol duration criteria before the actual UCI multiplexing decision. By pre-identifying and eliminating unsuitable PUSCH resources (those with 1 symbol or less), the system reduces the candidate set early in the process, making subsequent selection simpler while preserving adaptability among valid options.
3Productivity
If frequency hopping is enabled for PUSCH, then spectral efficiency is improved, but UCI mapping accuracy deteriorates due to frequency changes
Solution Approach 1:
The patent dynamically evaluates frequency hopping conditions when selecting PUSCH resources for UCI multiplexing. Rather than statically enabling or disabling frequency hopping, the system adaptively determines whether to apply frequency hopping based on current transmission conditions and UCI requirements, allowing spectral efficiency gains when appropriate while maintaining mapping accuracy when needed.
Data Source
AI summary
Technology for a user equipment (UE) operable to multiplex uplink control information (UCI) on a physical uplink shared channel (PUSCH) is disclosed. The UE can determine a symbol duration of the PUSCH. The UE can select a UCI transmission rule in accordance with the symbol duration of the PUSCH when a physical uplink control channel (PUCCH) resource carrying UCI overlaps with more than one PUSCH resource in time within a PUCCH group. The UE can multiplex the UCI on a selected PUSCH resource from the more than one PUSCH resource in accordance with the UCI transmission rule.