Low Priority UCI Retransmission via High Priority Scheduling
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Solution Overview
Problem
In ultra-reliable low latency communication (URLLC) systems, resource conflicts between high priority and low priority uplink control information (UCI) lead to dropped low priority UCI data, affecting performance, especially in scenarios like autonomous driving and robotic surgery where low latency is critical.
Innovation Solution
A method where the base station delivers identifier information of low priority UCI to be retransmitted using scheduling information of high priority UCI, through specific DCI fields (DAI and TD-DAI) to ensure consistent understanding and reduce redundant retransmissions, employing a one-shot codebook mechanism for efficient retransmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If low priority UCI is transmitted simultaneously with high priority UCI, then resource utilization is improved, but transmission reliability deteriorates due to conflicts
Solution Approach 1:
The patent segments UCI transmission into high priority and low priority components, using separate indication mechanisms (DAI and TD-DAI fields) to track and manage each priority level independently. This segmentation allows the system to handle conflicts by identifying specific low priority UCI for retransmission without affecting high priority UCI transmission
Solution Approach 2:
The base station performs preliminary action by pre-indicating which low priority UCI should be retransmitted through the DAI field in DCI formats before the actual retransmission occurs. This preliminary indication allows the terminal to prepare and execute retransmission accurately, reducing conflicts with high priority UCI
2Reliability
If low priority UCI is dropped during conflicts, then high priority UCI transmission reliability is improved, but information loss increases
Solution Approach 1:
The patent implements feedback through the TD-DAI (Total Downlink Assignment Index) field that provides the terminal with information about the total number of low priority UCI transmissions. This feedback mechanism allows the terminal to understand which low priority UCI were dropped and needs retransmission, minimizing information loss while preserving high priority UCI reliability
Solution Approach 2:
The system deliberately discards low priority UCI during conflicts (indicated by DAI field) but provides mechanisms for recovery through retransmission indications. The TD-DAI field helps track which information was discarded and needs to be recovered, ensuring minimal permanent information loss
3Reliability
If retransmission of low priority UCI is performed without accurate identification, then retransmission coverage is improved, but resource wastage increases
Solution Approach 1:
The patent extracts only the necessary identification information (DAI and TD-DAI values) from the full UCI transmission context. By taking out just the essential retransmission indicators, the system achieves accurate identification of low priority UCI for retransmission without the overhead of transmitting or processing complete UCI data again, reducing resource wastage while maintaining reliable coverage
Data Source
AI summary
A low priority uplink information retransmission method, includes: in response to uplink control information (UCI) having a transmission conflict, a base station using scheduling information of high priority UCI to deliver identifier information of low priority UCI to be retransmitted by a terminal in the UCI having the transmission conflict.