Flexible ADU Feedback via Outer Coding Redundancy
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Solution Overview
Problem
Current wireless communication systems face challenges in providing flexible feedback mechanisms, particularly at the application data unit (ADU) level, which limits efficiency and reliability in decoding and transmitting transport blocks (TBs) with outer coding redundancy.
Innovation Solution
The implementation of a method and apparatus for user equipment (UE) to transmit feedback messages at the ADU level, receiving transport blocks from a base station, and determining feedback based on successful decoding or error thresholds, allowing for flexible feedback configurations such as positive acknowledgments, absence of messages for unsuccessful decoding, and interruption messages when error thresholds are met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback is provided at the TB level for each transport block, then decoding reliability is improved, but feedback message quantity and transmission overhead increase
Solution Approach 1:
The patent merges multiple TB-level feedback messages into a single ADU-level feedback message. When multiple transport blocks belong to the same ADU, their individual ACK/NACK feedbacks are combined into one unified feedback message at the ADU level, reducing the total quantity of feedback messages while maintaining decoding reliability through outer coding redundancy.
Solution Approach 2:
The ADU-level feedback mechanism serves multiple functions: it provides acknowledgment for multiple TBs simultaneously, enables interruption feedback when error thresholds are met, and supports both ACK and NACK scenarios within a single feedback framework, reducing overall feedback overhead while maintaining reliability.
2Reliability
If feedback is transmitted for every TB received, then communication reliability is improved, but power consumption increases
Solution Approach 1:
By combining feedback for multiple TBs into a single ADU-level feedback message, the UE reduces the number of times it needs to transmit and process feedback messages, thereby reducing power consumption while maintaining communication reliability through the outer coding redundancy provided by additional TBs.
Solution Approach 2:
The system receives more TBs than strictly necessary (excessive action) to provide outer coding redundancy, which enables the UE to decode the ADU successfully even if some TBs are lost or erroneous. This reduces the need for frequent feedback transmissions, thereby reducing power consumption while maintaining reliability.
3Productivity
If interruption feedback is implemented when error thresholds are met, then communication efficiency is improved, but feedback mechanism complexity increases
Solution Approach 1:
The UE monitors the decoding status of TBs in advance and compares it against pre-configured error thresholds. When the threshold is met before all TBs are received, the UE can send an interruption feedback message early, avoiding the need to wait for complete ADU reception. This preliminary action improves communication efficiency by enabling early error detection and retransmission initiation.
Solution Approach 2:
The interruption feedback mechanism introduces a new feedback type that is triggered by error threshold conditions. This feedback provides the gNB with early information about decoding failures, enabling faster retransmission decisions and improving overall communication efficiency, though it does increase feedback mechanism complexity.
4Reliability
If outer coding redundancy is added to ADUs, then decoding reliability is improved, but data transmission overhead increases
Solution Approach 1:
The system transmits more TBs than the minimum required to carry the ADU payload, providing outer coding redundancy. This excessive action ensures that the UE can successfully decode the ADU even if some TBs are lost or corrupted, improving decoding reliability. The trade-off is increased data transmission overhead, but this is necessary to achieve the desired reliability level in wireless communication.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive multiple transport blocks (TBs) representing an application data unit (ADU) from a base station. The base station may transmit an indication that the UE is to provide ADU level feedback. The UE may determine the ADU level feedback based on whether the ADU is successfully received and decoded or not. The UE may indicate the ADU level feedback for the TBs to the base station. The base station and the UE may communicate according to the ADU level feedback.