HARQ-ACK Multiplexing in PUSCH for Multi-Cell Reliability
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Solution Overview
Problem
Current wireless communication systems face challenges in reliably transmitting HARQ-ACK signals in the PUSCH, especially when a UE is configured with multiple DL CCs, requiring improved resource dimensioning and transmission diversity to enhance reception reliability and support multiple simultaneous PUSCH transmissions.
Innovation Solution
The method involves configuring HARQ-ACK bits based on cell indexes and transport blocks, using the (32, O) Reed-Mueller block code for encoding, and applying transmission diversity techniques like STBC to ensure accurate HARQ-ACK transmission across multiple PUSCHs, selecting the PUSCH with the largest MCS for UCI multiplexing, and optimizing resource allocation to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ-ACK signals are transmitted in PUSCH for multiple DL CCs, then the reception reliability is improved, but the resource requirements and system complexity increase
Solution Approach 1:
The patent segments the HARQ-ACK transmission by selecting a specific PUSCH (with the largest MCS) to carry the multiplexed UCI, while other PUSCH transmissions maintain data-only mode. This segmentation allows reliable HARQ-ACK delivery without requiring all PUSCH resources to be optimized for control signaling, thus reducing overall system complexity while maintaining reliability.
Solution Approach 2:
The selected PUSCH serves dual functions: it carries both uplink data and multiplexed UCI (HARQ-ACK signals) simultaneously. This multi-functionality approach consolidates control signaling into a single versatile transmission resource, avoiding the need for separate dedicated control channels and reducing system complexity.
2Productivity
If HARQ-ACK signals are transmitted in PUSCH, then the transmission efficiency is improved, but the resource dimensioning complexity increases
Solution Approach 1:
The patent changes the parameter selection criterion from traditional approaches to specifically choosing the PUSCH with the largest MCS value for UCI multiplexing. This parameter-based selection simplifies resource dimensioning by providing a clear, objective rule that automatically adapts to channel conditions without requiring complex resource allocation algorithms.
3Measurement precision
If transmission diversity techniques like STBC are applied, then the reception accuracy is improved, but the processing complexity increases
Solution Approach 1:
The patent applies STBC encoding preliminarily to the UCI before multiplexing with data in the selected PUSCH. This preliminary application of transmission diversity ensures reception accuracy is established early in the processing chain, allowing subsequent operations to work with already-protected data and reducing overall processing complexity.
Data Source
AI summary
Methods and apparatus are described for transmitting hybrid automatic repeat request-acknowledgement (HARQ-ACK) bits in a physical uplink shared channel (PUSCH) by a user equipment (UE) in a communication system. A method includes receiving, from a base station, a first configuration of a plurality of cells and a second configuration of at least one offset for HARQ-ACK by higher layer signaling; obtaining HARQ-ACK bits for the plurality of cells, based on an order of cell indexes and a number of transport blocks for each of the plurality of the cells; identifying a number of coded symbols for the obtained HARQ-ACK bits based on a number of the obtained HARQ-ACK bits and an offset for HARQ-ACK corresponding to the obtained HARQ-ACK bits; and transmitting, to the base station, signals for the obtained HARQ-ACK bits on one PUSCH of multiple PUSCHs based on the number of coded symbols.