PUCCH HARQ-ACK Joint Coding for Mixed-Priority Payloads
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Solution Overview
Problem
Existing wireless communication systems face limitations in flexibility and efficiency when handling hybrid automatic repeat request-acknowledgment (HARQ-ACK) with different priorities on Physical Uplink Control Channels (PUCCH) formats 2, 3, or 4, particularly in scenarios where the total payload exceeds 2 bits.
Innovation Solution
The system employs joint coding and multiplexing of HARQ-ACK with different priorities by determining a PUCCH resource based on the total HARQ-ACK payload, concatenating low and high priority HARQ-ACK into a single joint HARQ-ACK codebook, and transmitting this on a selected PUCCH resource, with options for payload reduction or high priority transmission if the total payload exceeds the maximum configured size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate PUCCH resources are used for high priority and low priority HARQ-ACK, then priority differentiation is maintained, but resource utilization efficiency deteriorates when payloads overlap
Solution Approach 1:
The patent merges high priority and low priority HARQ-ACK payloads into a single PUCCH transmission when the high priority PUCCH payload is 2 bits or less. This combining approach allows both priority levels to be transmitted together on the same resource, improving resource utilization while maintaining priority differentiation through separate codebook structures and multiplexing schemes.
2Productivity
If joint coding is applied to HARQ-ACK with different priorities, then transmission efficiency improves, but complexity of resource determination increases
Solution Approach 1:
The patent segments the HARQ-ACK codebooks by priority level (high priority and low priority) while applying joint coding. The UE determines separate codebooks for each priority, then multiplexes them according to specific rules. This segmentation approach simplifies resource determination by providing clear guidelines for codebook construction and multiplexing, reducing the overall complexity despite the joint coding benefit.
3Productivity
If total HARQ-ACK payload is multiplexed on single PUCCH, then resource overhead is reduced, but error protection capability deteriorates for high priority data
Solution Approach 1:
The patent applies local quality by providing differential error protection for high priority and low priority HARQ-ACK within the same PUCCH transmission. The high priority HARQ-ACK bits are protected with higher reliability requirements through separate codebook construction and prioritized multiplexing rules, ensuring that critical data maintains superior error protection even when shared resources are used.
Data Source
AI summary
A user equipment (UE) is described. The UE determines a joint coding for more than two bits of total payload for low priority hybrid automatic repeat request-acknowledgement (HARQ-ACK) and high priority HARQ-ACK on a physical uplink control channel (PUCCH). The UE also determines a PUCCH resource based on the total HARQ-ACK payload from sets of high priority PUCCH resources. The UE further determines a number of physical resource blocks (PRBs) for a PUCCH transmission based on the total HARQ-ACK payload and a maxCodeRate on the selected PUCCH resource. The UE also multiplexes the low priority HARQ-ACK and the high priority HARQ-ACK based on the determined joint coding. The UE further transmits the multiplexed HARQ-ACK on the PUCCH.