Sidelink HARQ Feedback Prioritization to Reduce Retransmission Congestion
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Solution Overview
Problem
Existing wireless communication systems, particularly in NR and LTE technologies, face challenges in managing hybrid automatic repeat request (HARQ) feedback operations in sidelink communications, leading to unnecessary data retransmissions and increased transmission congestion due to improper handling of HARQ feedbacks.
Innovation Solution
A method and apparatus for determining priority information associated with HARQ feedbacks in sidelink communications, where HARQ feedbacks are selected and transmitted based on priority, preventing unnecessary retransmissions and reducing congestion by prioritizing certain types of feedbacks such as ACK over NACK, based on factors like successful transmissions, dropped feedbacks, transmission modes, and resource pool congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all HARQ feedbacks are transmitted without priority-based selection, then complete feedback information is provided to all wireless nodes, but transmission congestion increases and resource utilization decreases
Solution Approach 1:
The patent segments the set of HARQ feedbacks into multiple priority groups based on associated parameters (e.g., success rate, transmission importance). Instead of treating all feedbacks equally, the system divides them into high-priority and low-priority categories, selecting feedbacks for transmission based on these segments. This segmentation allows the system to maintain reliability for critical feedbacks while reducing overall transmission load.
Solution Approach 2:
The patent applies local quality by assigning different transmission priorities to different HARQ feedbacks based on their specific characteristics. Each feedback is evaluated against criteria such as success rate, data importance, and channel conditions, receiving a localized priority assignment rather than uniform treatment. This enables differentiated resource allocation where critical feedbacks receive higher priority transmission opportunities.
2Productivity
If priority-based selection is implemented for HARQ feedback transmission, then transmission congestion is reduced and resource utilization improves, but feedback information may be incomplete for some wireless nodes
Solution Approach 1:
The patent implements preliminary action by pre-establishing priority criteria and classification rules for HARQ feedbacks before transmission occurs. The system预先 defines which feedbacks are high-priority based on parameters like success rate thresholds and data importance levels. This preliminary classification enables efficient real-time selection without complex runtime decisions, maintaining both productivity and reliability.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting priority assignments based on varying channel conditions, transmission success rates, and data importance. The system monitors feedback parameters and adapts priority levels accordingly, allowing flexible resource allocation that maintains reliability even under changing conditions while optimizing overall resource utilization.
3Reliability
If HARQ feedbacks are transmitted without prioritization, then all wireless nodes receive feedback, but unnecessary data retransmissions occur increasing congestion
Solution Approach 1:
The patent applies inversion by reversing the conventional approach of transmitting all feedbacks equally. Instead of starting with complete transmission and filtering, the system starts by identifying high-priority feedbacks that must be transmitted and selectively omits lower-priority ones. This inverted selection process prevents unnecessary retransmissions by ensuring only critical feedbacks trigger retransmission actions.
Solution Approach 2:
The patent extracts and removes low-priority HARQ feedbacks from the transmission set based on predefined criteria. By taking out feedbacks associated with successful transmissions or low-importance data, the system prevents unnecessary retransmissions while maintaining essential feedback delivery. This extraction process directly reduces harmful retransmissions while preserving reliability for critical communications.
Data Source
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AI summary
Certain aspects of the present disclosure provide techniques for determining priority information associated with hybrid automatic repeat request (HARQ) feedbacks for wireless nodes in sidelink communications. A subset of the HARQ feedbacks are selected based on the priority information. The selected HARQ feedbacks are then transmitted to the second wireless nodes.