Type-3 HARQ-ACK Codebook Priority Segmentation for Mixed Traffic
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting Type-3 HARQ-ACK codebooks, particularly in assigning different physical priority levels to HARQ-ACK bits and facilitating uplink prioritization and multiplexing, especially in mixed traffic scenarios involving eMBB and URLLC data.
Innovation Solution
The enhancement of Type-3 HARQ-ACK codebooks allows for the differentiation of HARQ-ACK bits based on priority indices, enabling the assignment of high and low priority levels and supporting various DCI formats to trigger the codebook, thereby resolving uplink resource conflicts and ensuring timely transmission of critical feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If Type-3 HARQ-ACK codebook transmission is used to reduce latency, then transmission speed is improved, but the ability to prioritize different HARQ-ACK bits based on traffic type (eMBB vs URLLC) is insufficient
Solution Approach 1:
The patent applies local quality by assigning different priority levels (first priority and second priority) to different HARQ-ACK bits within the same Type-3 codebook based on their associated traffic type (eMBB or URLLC). This allows specific portions of the codebook to have different priority characteristics, enabling URLLC feedback to be transmitted before eMBB feedback when resources conflict, while maintaining the overall fast transmission benefit of Type-3 codebooks.
2Productivity
If multiple HARQ-ACK bits are multiplexed in a single Type-3 codebook, then transmission efficiency is improved, but resource conflicts between different priority traffic types cannot be resolved
Solution Approach 1:
The patent segments the Type-3 HARQ-ACK codebook into different priority groups (first priority HARQ-ACK bits and second priority HARQ-ACK bits) based on the traffic type of associated PDSCHs. This segmentation allows the system to maintain the efficiency benefits of multiplexing while introducing priority-based differentiation, so that when uplink resources conflict, higher priority URLLC feedback can be transmitted before lower priority eMBB feedback.
3Device complexity
If Type-3 HARQ-ACK codebook is transmitted without priority indication, then device complexity is reduced, but uplink prioritization for mixed traffic scenarios is not supported
Solution Approach 1:
The patent enables the Type-3 HARQ-ACK codebook to self-determine priority levels by associating each HARQ-ACK bit with the traffic type (eMBB or URLLC) of its corresponding PDSCH. The UE autonomously assigns first priority to URLLC-associated HARQ-ACK bits and second priority to eMBB-associated HARQ-ACK bits without requiring external priority indication from the network, thus maintaining simple codebook structure while enabling mixed traffic prioritization.
Data Source
AI summary
According to some embodiments, a method performed by a wireless device for transmitting a Type-3 hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook comprises receiving downlink control information (DCI) requesting a Type-3 HARQ-ACK codebook and an indication of a priority associated with the Type-3 HARQ-ACK codebook, and based on the DCI request and priority indication, transmitting the Type-3 HARQ-ACK codebook to a network node.