IAB Node NACK-Only STATUS PDU for Wireless Latency Reduction
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Solution Overview
Problem
In wireless communication systems, relay nodes face challenges in efficiently transmitting and receiving data due to limited resources and latency issues, particularly in applications requiring low latency and high reliability.
Innovation Solution
An Integrated Access and Backhaul (IAB) node method that generates a STATUS Protocol Data Unit (PDU) with Negative Acknowledgement (NACK) information for detected reception failures, without including Acknowledgement (ACK) information for successfully received data units, to facilitate efficient retransmission and reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the STATUS PDU includes both ACK and NACK information for all data units, then the child node receives complete feedback, but the latency increases due to longer processing and transmission time
Solution Approach 1:
The patent extracts only the NACK information from the complete feedback set and transmits it separately in a NACK-only STATUS PDU. This extraction principle allows the system to send critical retransmission information quickly without the overhead of including ACK information for all successfully received data units, thereby reducing latency while maintaining reliability for failed transmissions.
2Reliability
If the STATUS PDU includes ACK information for all successfully received data units, then the acknowledgement state variable is properly updated, but the data transmission efficiency decreases due to increased retransmission delays
Solution Approach 1:
Instead of the conventional approach of sending ACK for successful receptions and NACK for failures, the patent inverts the feedback mechanism by sending only NACK information in a dedicated NACK-only STATUS PDU. This inversion allows the system to focus resources on retransmitting only failed data units, improving overall data transmission efficiency while maintaining acknowledgement accuracy through selective feedback.
3Reliability
If the IAB node processes and transmits comprehensive STATUS PDU with all ACK/NACK information, then the child node can update its state variables accurately, but the resource consumption increases
Solution Approach 1:
The patent extracts and transmits only the essential NACK information in a compact NACK-only STATUS PDU format. This extraction reduces the size and complexity of the STATUS PDU, thereby reducing the radio resources, processing power, and energy consumption required for feedback transmission while maintaining the accuracy needed for state variable updates at the child node.
Data Source
AI summary
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for transmitting to a child node, a STATUS PDU including Negative Acknowledgement (NACK) information corresponding to one or more data units of which reception failure is detected, wherein the STATUS PDU does not include ACK information for data units which are successfully received.