Early HARQ-ACK Feedback for High-Priority PUSCH in Unlicensed Bands
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Solution Overview
Problem
Existing technologies lack efficient methods for HARQ-ACK feedback on high-priority physical uplink shared channels (PUSCH) in unlicensed frequency bands, particularly for ultra-reliable low-latency communications (URLLC) services, which require timely HARQ-ACK information to reduce data transmission latency.
Innovation Solution
The method involves a network device determining the reception of a high-priority PUSCH and transmitting downlink feedback information (DFI) after the time domain resource of the PUSCH ends, ensuring timely HARQ-ACK feedback for high-priority PUSCH, with options for configuring DCI monitoring occasions or using a timer for efficient HARQ-ACK information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If downlink feedback information is transmitted after all uplink HARQ-ACK processes are completed, then feedback accuracy is improved, but data transmission latency increases for high-priority services
Solution Approach 1:
The patent segments the HARQ-ACK feedback process by introducing separate feedback mechanisms for high-priority and low-priority services. High-priority PUSCH transmissions receive dedicated early feedback through specific DCI formats, while low-priority transmissions follow the traditional complete-process feedback model. This segmentation allows timely feedback for urgent services without compromising overall system feedback accuracy.
Solution Approach 2:
The patent implements preliminary action by transmitting downlink feedback information for high-priority PUSCH before all uplink HARQ-ACK processes are completed. The network device prepares and sends feedback in advance based on preliminary assessment of received signals, enabling fast retransmission for high-priority services while maintaining the option to complete full processing for other services.
2Loss of time
If separate feedback mechanisms are implemented for high-priority PUSCH, then data transmission latency is reduced, but system complexity increases
Solution Approach 1:
The patent achieves universality by designing DCI formats that can serve multiple functions. Specific DCI formats are configured to handle both high-priority PUSCH feedback and traditional scheduling functions. The same downlink control information structure is used for different priority levels, reducing the need for entirely separate feedback channels and minimizing system complexity while still providing dedicated fast feedback paths.
3Productivity
If downlink feedback information is transmitted early for high-priority PUSCH, then fast retransmission is enabled, but feedback information accuracy may be compromised
Solution Approach 1:
The patent implements dynamics by making the feedback timing and processing depth adaptive based on priority levels. For high-priority PUSCH, the system dynamically provides early feedback with sufficient processing for reliable decision-making. For low-priority or non-urgent transmissions, the system can defer feedback until complete analysis is available. This dynamic approach optimizes the trade-off between speed and accuracy based on service requirements.
Data Source
AI summary
An unlicensed frequency band feedback method is provided. The method may be performed by a network device and may include: determining that a high-priority physical uplink shared channel is received; and transmitting downlink feedback information that feeds back hybrid automatic repeat request acknowledgement information for the high-priority physical uplink shared channel.