DCI Grant Acknowledgement for Half-Duplex IAB Scheduling
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Solution Overview
Problem
Integrated access and backhaul (IAB) systems face challenges due to the half-duplex constraint, where a relay node functions as both a scheduled node and a scheduling node, leading to conflicting scheduling decisions that violate the half-duplex constraint.
Innovation Solution
A resource allocation scheme is introduced for IAB systems that involves requesting acknowledgement of downlink control information (DCI) scheduling grants, allowing scheduled nodes to evaluate and send feedback (ACK or NACK) to ensure compliance with the half-duplex constraint, thereby avoiding conflicting scheduling decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If integrated access and backhaul systems allow relay nodes to function as both scheduled nodes and scheduling nodes to improve spectrum utilization, then network throughput is improved, but conflicting scheduling decisions occur that violate the half-duplex constraint
Solution Approach 1:
The patent implements a feedback mechanism where scheduled nodes send acknowledgments (ACK/NACK) to scheduling nodes regarding resource grant acceptance. This feedback loop enables the scheduling node to adjust future resource allocations based on whether the scheduled node can actually utilize the granted resources without violating half-duplex constraints, thereby resolving scheduling conflicts while maintaining high spectrum utilization.
Solution Approach 2:
The patent introduces preliminary scheduling decisions followed by acknowledgment verification. Before finalizing resource allocation, the system sends resource grants to scheduled nodes and waits for acknowledgment. This preliminary action allows the system to identify and resolve potential half-duplex violations before they occur, ensuring constraint compliance while maintaining efficient resource utilization.
2Reliability
If resource coordination mechanisms are implemented to prevent scheduling conflicts, then half-duplex constraint compliance is improved, but system complexity increases
Solution Approach 1:
The patent enables scheduled nodes to autonomously determine whether they can accept resource grants based on their own half-duplex status and current transmission state. Each node independently evaluates its ability to utilize granted resources and provides feedback accordingly, eliminating the need for complex centralized coordination mechanisms while ensuring constraint compliance.
Data Source
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AI summary
Aspects of the disclosure relate to devices for coordinating resource usage. A scheduled device receives a downlink control information (DCI) grant from a scheduling device, the DCI grant identifying scheduled resources for communicating data. The scheduled device decides whether the DCI grant is acceptable for communicating the data and sends an acknowledgement to the scheduling device based on the decision and information associated with the DCI grant. The scheduled device communicates the data via the scheduled resources when the DCI grant is decided to be acceptable. A scheduling device transmits the DCI grant to the scheduled device and receives the acknowledgement from the scheduled device based on the information associated with the DCI grant. The acknowledgement indicates whether the DCI grant is acceptable for communicating the data. The scheduling device communicates the data via scheduled resources identified in the DCI grant when the DCI grant is indicated to be acceptable.