PUCCH UCI Multiplexing with Priority-Based HARQ-ACK Coding
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Solution Overview
Problem
In 5G NR networks, lower priority transmissions, particularly control information, are prone to being dropped due to overlapping resource conflicts, which can be detrimental to UE operations.
Innovation Solution
A user equipment (UE) in a 5G NR system multiplexes high-priority (HP) and low-priority (LP) HARQ-ACK bits onto a physical uplink control channel (PUCCH) transmission by encoding them with different maximum code rates, configured via RRC signaling, to prioritize and encode HP HARQ-ACK bits with a first maximum code rate and LP HARQ-ACK bits with a second maximum code rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resources are scheduled or configured for high or low physical layer priorities to handle collisions, then transmission priority is improved, but lower priority transmissions are dropped
Solution Approach 1:
The patent segments the PUCCH transmission into two distinct parts: a first part for high-priority UCI and a second part for low-priority UCI. This segmentation allows both priority levels to be transmitted simultaneously without interference, resolving the contradiction between transmission priority and information completeness.
Solution Approach 2:
The patent introduces a new dimension of resource allocation by dividing the PUCCH transmission in the time domain into different parts. This temporal dimensionality allows high-priority and low-priority transmissions to coexist without collision, eliminating the need to drop lower priority transmissions while maintaining priority-based scheduling.
2Device complexity
If lower priority transmissions are dropped to handle resource conflicts, then scheduling simplicity is improved, but control information reliability deteriorates
Solution Approach 1:
By segmenting the PUCCH transmission into separate parts for high-priority and low-priority UCIs, the system maintains scheduling simplicity while ensuring control information reliability. The segmented structure allows the scheduler to handle conflicts systematically without dropping lower priority transmissions.
Solution Approach 2:
The patent applies preliminary action by pre-configuring the UE with multiple PUCCH resources and their corresponding priorities through RRC signaling before actual transmission occurs. This preliminary setup enables the UE to automatically select appropriate resources based on UCI priority without complex real-time scheduling decisions, maintaining both simplicity and reliability.
3Manufacturing precision
If separate encoding is applied to high and low priority HARQ-ACK bits, then encoding precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the encoding process by applying separate maximum code rates to high-priority and low-priority HARQ-ACK bits. This allows optimized encoding precision for each priority level while the overall process remains integrated within the standard encoding framework, minimizing additional complexity.
Solution Approach 2:
The patent changes the encoding parameter (maximum code rate) based on UCI priority. By adjusting this parameter dynamically according to priority levels, the system achieves encoding precision tailored to each priority while avoiding the need for completely separate encoding systems, thus managing device complexity.
Data Source
AI summary
A user equipment (UE) configured for operation in a fifth-generation new radio (5GNR) system may multiplex high-priority (HP) hybrid automatic repeat request acknowledge (HARQ-ACK) bits corresponding to a first HARQ-ACK code-book with low-priority (LP) HARQ-ACK bits corresponding to a second HARQ-ACK codebook onto a physical uplink control channel (PUCCH) transmission to a gNode B (gNB). The UE may be configured with the first HARQ-ACK codebook and the second HARQ-ACK codebook of different priorities. The HP HARQ-ACK bits may be encoded with a first maximum code rate (maxCodeRate) and the LP HARQ-ACK bits may be encoded with a second maximum code rate. The maximum code rates may be configured to the UE via RRC signalling per PUCCH format.