NR PUSCH UCI Mapping by Distance from Reference Signals
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Solution Overview
Problem
The challenge in NR/5G wireless communication is the varying DMRS patterns and different waveforms, which complicate the mapping of Uplink Control Information (UCI) in Physical Uplink Shared Channel (PUSCH), leading to potential RS collisions and suboptimal channel performance.
Innovation Solution
The solution involves mapping UCI in PUSCH based on the distances of resource elements with respect to reference signals in the time, frequency, and spatial domains, prioritizing UCI types according to their priorities, and avoiding collisions with DMRS and PT-RS patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UCI mapping is based on fixed DMRS pattern as in LTE, then mapping rule is simple, but it cannot adapt to varying DMRS patterns in NR and causes potential RS collisions
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed DMRS pattern to dynamic pattern recognition. The base station determines DMRS pattern information based on actual transmitted reference signals, allowing the UCI mapping rule to adapt dynamically to different DMRS configurations (first, second, or third patterns) rather than using a static mapping approach
Solution Approach 2:
The patent changes the parameter of mapping rule selection based on DMRS pattern identification. Different UCI mapping rules (first mapping rule for first pattern, second mapping rule for second pattern, third mapping rule for third pattern) are selected according to the detected DMRS pattern, allowing flexible adaptation to varying reference signal configurations
2Reliability
If UCI is mapped close to DMRS for better channel performance, then channel performance improves, but collision with DMRS and PT-RS increases
Solution Approach 1:
The patent applies local quality by differentiating UCI mapping positions based on local DMRS pattern characteristics. Different regions of the time-frequency grid are assigned different mapping rules depending on the local DMRS configuration, allowing optimal positioning that avoids collisions while maintaining proximity to reference signals for better channel estimation
Solution Approach 2:
The patent segments the UCI mapping process into multiple independent mapping rules corresponding to different DMRS patterns. Each mapping rule handles a specific segment of the resource allocation, allowing systematic avoidance of DMRS and PT-RS collision zones while maintaining optimal channel performance in each segment
3Reliability
If different UCI types are mapped with different priorities, then priority handling is improved, but mapping complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-establishing priority-based mapping rules before actual UCI transmission. The base station and UE agree on the priority ordering of different UCI types (HARQ-ACK, CSI, RI) in advance, allowing deterministic mapping decisions without complex real-time priority arbitration
Data Source
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AI summary
Provided are a user equipment, base station and wireless communication methods related to uplink control information mapping in physical uplink resources in NR (New Radio access technology). A user equipment comprises: circuitry operative to map, in physical resource blocks (PRBs) for Physical Uplink Shared Channel (PUSCH), Uplink Control Information (UCI) to one or more available resource elements according to their distances with resource elements where reference signals are mapped in one or more of time domain, frequency domain and spatial domain; and a transmitter operative to transmit the UCI and the reference signals in PUSCH on the PRBs to a base station.