Uplink Channel Multiplexing via Priority-Based HARQ-ACK Mapping
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Solution Overview
Problem
In wireless communications, existing methods for multiplexing uplink communications in wireless systems, particularly when Low Priority and High Priority communications overlap, often result in reliability issues and resource inefficiencies, as they either drop Low Priority channels or fail to effectively manage payload sizes, leading to potential decoding failures and increased resource usage.
Innovation Solution
A method and system where a User Equipment (UE) multiplexes Low Priority (LP) and High Priority (HP) Hybrid Automatic Repeat Request acknowledgment (HARQ-ACK) codebooks in a Physical Uplink Shared Channel (PUSCH), with the HP HARQ-ACK codebook mapped after a DMRS symbol and LP HARQ-ACK codebook mapped from a symbol without DMRS Resource Elements, using threshold-based payload size determination to allocate Resource Elements (REs) efficiently, ensuring reliable transmission of both priorities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Low Priority and High Priority HARQ-ACK codebooks are multiplexed in a PUSCH, then resource utilization is improved, but reliability may deteriorate due to potential decoding failures
Solution Approach 1:
The patent segments the PUSCH transmission into different symbol regions: DMRS symbols for reference signals, first PUSCH symbols for High Priority HARQ-ACK codebook, and second PUSCH symbols for Low Priority HARQ-ACK codebook. This temporal segmentation allows both priority levels to share the same channel while maintaining distinct resource allocation, improving overall resource utilization while preserving decoding reliability through structured separation.
Solution Approach 2:
The patent applies different mapping rules and resource allocation strategies to different parts of the PUSCH based on priority levels. High Priority HARQ-ACK codebook is mapped in earlier symbols with higher resource allocation, while Low Priority HARQ-ACK codebook is mapped in later symbols with reduced resource allocation. This local differentiation ensures that critical High Priority transmissions maintain high reliability while Low Priority transmissions efficiently utilize remaining resources.
2Productivity
If threshold-based payload size determination is used, then resource allocation efficiency is improved, but complexity increases due to multiple threshold checks
Solution Approach 1:
The patent employs threshold-based parameter changes to dynamically adjust resource allocation. By comparing the payload size against predefined thresholds (first threshold for High Priority, second threshold for Low Priority), the system automatically determines the appropriate number of REs to allocate. This parameter-driven approach simplifies the decision logic while maintaining high resource allocation efficiency across different payload scenarios.
3Reliability
If High Priority HARQ-ACK codebook is mapped after DMRS symbol, then transmission reliability is improved, but time consumption increases
Solution Approach 1:
The patent performs preliminary actions by mapping the High Priority HARQ-ACK codebook in the first PUSCH symbols immediately after the DMRS symbol, before allocating resources for Low Priority content. This preliminary mapping ensures that High Priority transmissions receive the most critical resource allocation first, maximizing their reliability. The structured sequential mapping then efficiently handles Low Priority content without causing significant time delay, as the framework is already in place from the preliminary High Priority allocation.
Data Source
AI summary
A system and method for multiplexing uplink communications. In some embodiments, the method includes: multiplexing, by a User Equipment (UE) a Low Priority (LP) Hybrid Automatic Repeat Request acknowledgment (HARQ-ACK) codebook and a High Priority (HP) HARQ-ACK codebook in a first Physical Uplink Shared Channel (PUSCH), the multiplexing including mapping the HP HARQ-ACK codebook after a first symbol that follows a Demodulation Reference Signal (DMRS) and that does not include any DMRS Resource Elements (REs).