Autonomous Transmission After Cancellation Indicator
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Solution Overview
Problem
In 5G NR systems, when a UE is configured with a CG but receives a CI to cancel the transmission before or during the CG transmission, it leads to inefficiencies, including unnecessary retransmissions and increased latency due to the gNB's inability to confirm if data was transmitted, especially when there is no data to send.
Innovation Solution
The UE is enabled to autonomously transmit data associated with a cancelled CG in a subsequent transmission occasion without waiting for re-scheduling, allowing for efficient resource management and avoiding unnecessary retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gNB schedules retransmission for cancelled CG to ensure data delivery, then reliability is improved, but productivity deteriorates due to unnecessary retransmissions when no data was actually transmitted
Solution Approach 1:
The patent implements a feedback mechanism where the UE sends an indicator to the gNB to notify that autonomous transmission is performed. This feedback allows the gNB to understand that the cancelled CG data is being retransmitted autonomously, preventing the gNB from scheduling unnecessary retransmissions and avoiding resource waste while ensuring reliable data delivery
Solution Approach 2:
The UE autonomously decides and performs retransmission of cancelled CG data without waiting for gNB scheduling. This self-service approach allows the UE to independently handle the retransmission, improving productivity by avoiding unnecessary network coordination while maintaining reliability through the feedback indicator
2Device complexity
If the UE waits for gNB scheduling before retransmitting cancelled CG data, then device complexity is reduced, but loss of time increases due to waiting and potential data loss
Solution Approach 1:
The patent enables the UE to perform preliminary autonomous transmission action immediately after CG cancellation without waiting for gNB scheduling. The UE can directly retransmit the data in the next available transmission occasion, significantly reducing latency. The feedback indicator is sent alongside the transmission to inform the gNB of this preliminary action
Solution Approach 2:
The patent introduces dynamic behavior where the UE can switch between traditional scheduled retransmission and autonomous transmission modes. The MAC algorithm is enhanced to dynamically decide when to perform autonomous transmission based on the cancellation indicator and current transmission opportunities, balancing complexity reduction with time loss minimization
3Productivity
If the UE performs autonomous transmission after CI cancellation, then productivity is improved by avoiding unnecessary retransmissions, but device complexity increases due to autonomous transmission management
Solution Approach 1:
The patent implements self-service where the UE autonomously manages the retransmission process without requiring complex gNB coordination. The UE independently decides when and where to retransmit cancelled CG data, improving productivity by eliminating unnecessary scheduled retransmissions. The feedback indicator provides minimal additional complexity while enabling the gNB to understand the autonomous action
Data Source
AI summary
A method 1200 performed by a wireless device 110 includes receiving 1202 a cancellation indicator (CI) cancelling a transmission of data associated with a configured grant (CG) in a first transmission occasion. The wireless device 110 transmits the data associated with the CG in a second transmission occasion of the CG.