PUSCH UCI Multiplexing Across MIMO Layers With Uneven TB Reliability
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently multiplexing control information and data information over multiple spatial layers in PUSCH transmissions, particularly in MIMO environments, where different TBs have varying reception reliability characteristics, leading to complex processing and potential interference.
Innovation Solution
A UE computes the number of coded control information symbols in each spatial layer based on the average MCS of multiple TBs, using parameter values assigned by the base station, and applies different βoffset values for retransmissions, ensuring reliable UCI reception and simplified processing by aligning UCI symbols across layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If control information is multiplexed with data information over multiple spatial layers in PUSCH transmissions, then spectral efficiency and data rates are improved, but reliable reception and processing of UCI signals becomes more difficult when TBs have different reception reliability characteristics
Solution Approach 1:
The patent applies local quality by differentiating the treatment of control information across different spatial layers based on their individual reliability characteristics. Each spatial layer is assigned a specific modulation scheme and coding rate tailored to its reliability properties, allowing optimized multiplexing of control and data information while maintaining reliable reception across all layers.
Solution Approach 2:
The patent implements dynamics by enabling adaptive modulation and coding rates for control information on a per-spatial-layer basis. The modulation scheme and coding rate are dynamically selected and adjusted according to the reliability characteristics of each spatial layer, allowing the system to optimize spectral efficiency while maintaining reliable UCI reception under varying channel conditions.
2Productivity
If different modulation schemes and coding rates are used for different spatial layers, then resource allocation is optimized, but processing complexity of UCI signals increases
Solution Approach 1:
The patent applies segmentation by dividing the control information processing into separate handling for each spatial layer. Each spatial layer is processed independently with its own modulation and coding parameters, allowing optimized resource allocation while managing processing complexity through structured separation of operations rather than monolithic processing.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting modulation schemes and coding rates for control information on each spatial layer based on reliability characteristics. This allows optimized resource allocation across different layers while the changes are managed through standardized parameter adjustment procedures that control processing complexity.
3Adaptability or versatility
If control information symbols are allocated proportionally across spatial layers, then fair resource distribution is achieved, but spectral efficiency may be reduced
Solution Approach 1:
The patent applies local quality by assigning different resource allocation proportions to different spatial layers based on their individual reliability characteristics. Rather than uniform proportional allocation, each layer receives tailored resource distribution that optimizes spectral efficiency for its specific conditions while maintaining fairness through differentiated service based on actual channel quality.
Solution Approach 2:
The patent implements dynamics by enabling adaptive resource allocation across spatial layers that responds to changing channel conditions. The proportional allocation is dynamically adjusted based on real-time reliability measurements, allowing the system to optimize spectral efficiency when conditions permit while ensuring fair distribution when reliability varies, thus achieving both goals through time-varying adaptation.
Data Source
AI summary
A method and apparatus are provided for multiplexing Uplink Control Information (UCI) with data information in a Physical Uplink Shared CHannel (PUSCH) transmitted over multiple spatial layers where aspects of the UCI multiplexing include the determination of the number of coded UCI symbols in each spatial layer when the data information is conveyed using multiple Transport Blocks (TBs), the determination of the number of coded UCI symbols in each spatial layer when the PUSCH conveys a single TB retransmission for a Hybrid Automatic Repeat reQuest (HARQ) process while the initial TB transmission for the same HARQ process was in a PUSCH conveying multiple TBs, and the determination of the modulation scheme for the coded UCI symbols.