HARQ Feedback Priority Handling in Wireless Bandwidth Parts
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Solution Overview
Problem
Current multicarrier communication systems face challenges in efficiently managing Hybrid Automatic Repeat Request (HARQ) feedback, particularly in dynamic and diverse radio environments, which affects data transmission reliability and throughput.
Innovation Solution
The implementation of advanced HARQ feedback mechanisms within the New Radio (NR) framework, utilizing advanced modulation schemes like Quadrature Amplitude Modulation (QAM) and adaptive coding schemes, along with efficient channel state information (CSI) management, to optimize data transmission and error correction across multiple carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback is transmitted for all transport blocks regardless of priority, then data transmission reliability is improved, but uplink control channel resources are wasted on low-priority data
Solution Approach 1:
The patent applies local quality by differentiating HARQ feedback transmission based on transport block priority. High-priority transport blocks receive full HARQ feedback (ACK/NACK) to ensure reliable transmission, while low-priority transport blocks use dropped feedback to conserve resources. This selective approach optimizes resource allocation by applying different quality levels of feedback to different parts of the data transmission based on their priority requirements.
Solution Approach 2:
The patent changes the feedback transmission parameter dynamically based on priority indication. When high priority is indicated, the system transmits HARQ feedback; when low priority is indicated, the system drops the feedback. This parameter change allows the system to adapt resource consumption to the actual importance of the data being transmitted, resolving the contradiction between reliability and resource waste.
2Reliability
If HARQ feedback is transmitted for all transport blocks, then data transmission reliability is improved, but system complexity increases due to additional signaling and processing
Solution Approach 1:
The patent reduces system complexity by applying local quality differentiation. Instead of uniformly processing HARQ feedback for all transport blocks (which increases complexity), the system selectively processes feedback only for high-priority blocks. This localized approach maintains reliability where needed while reducing overall system complexity by eliminating unnecessary processing for low-priority data.
Solution Approach 2:
The patent applies partial action by transmitting HARQ feedback only for high-priority transport blocks rather than all blocks. This partial feedback mechanism provides sufficient reliability for critical data while avoiding the excessive complexity that would result from processing feedback for every single transport block, regardless of priority.
3Productivity
If priority-based HARQ feedback dropping is implemented, then resource efficiency is improved, but measurement precision of transmission reliability deteriorates
Solution Approach 1:
The patent uses dynamics by making HARQ feedback transmission adaptive based on priority indicators. The system dynamically adjusts feedback transmission behavior according to the priority level of each transport block, allowing resource efficiency to be optimized without permanently sacrificing reliability measurement precision. High-priority blocks maintain full feedback for accurate reliability measurement, while low-priority blocks use dropped feedback to improve resource efficiency.
Data Source
AI summary
A wireless device receives a DCI indicating a first priority of a transport block and a hybrid automatic repeat request (HARQ) feedback timing of a HARQ feedback of the transport block. The wireless device switches, after receiving the DCI and before the HARQ feedback timing, from a first bandwidth part to a second bandwidth part as an active bandwidth part. The wireless device transmits or drops the HARQ feedback based on whether or not the first priority of the transport block comprises a first value.