URLLC Control Channel Miss-Detection Detection via Shared UL Resources
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in spectrum usage due to unnoticed missed detection of control channels in HARQ-less transmission techniques, particularly in URLLC applications, leading to unnecessary re-transmissions and resource wastage.
Innovation Solution
A method for detecting control channel miss-detection at UE, involving shared UL control resources, explicit acknowledgement, and early termination of data channel retransmissions, allowing for control channel link adaptation and efficient resource management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If HARQ-less transmission technique is used for URLLC data transmission, then latency is reduced, but control channel missed detection cannot be detected leading to spectral inefficiency
Solution Approach 1:
The patent introduces a feedback mechanism where the UE sends an acknowledgement signal on shared UL control resources to indicate whether the control channel was successfully detected. This feedback allows the gNB to detect control channel missed detection and avoid unnecessary retransmissions, thereby improving spectral efficiency while maintaining the low latency benefits of HARQ-less transmission.
Solution Approach 2:
The patent uses shared UL control resources as an intermediary mechanism to convey detection status information. These shared resources serve as a mediator between the UE and gNB, enabling the gNB to infer control channel detection status without requiring full HARQ retransmission protocols, thus resolving the contradiction between low latency and spectral efficiency.
2Reliability
If maximum number of re-transmissions are always transmitted according to predefined patterns, then reliability is improved, but spectrum efficiency deteriorates due to unnecessary re-transmissions
Solution Approach 1:
The patent makes the retransmission process dynamic by allowing early termination based on feedback from the UE. Instead of rigidly following predefined retransmission patterns, the system adapts to actual channel conditions and UE detection status, terminating retransmissions early when successful detection is confirmed. This dynamic approach maintains reliability while improving spectrum efficiency.
Solution Approach 2:
The patent enables the system to discard unnecessary retransmissions when the UE successfully detects the control channel, as indicated by the acknowledgement signal. By discarding these redundant transmissions, spectrum resources are recovered and can be reallocated to other uses, thereby improving overall spectrum efficiency while maintaining the required reliability through selective retransmission.
3Loss of energy
If re-transmission is terminated early upon positive feedback, then spectrum efficiency is improved, but control channel missed detection remains unnoticed
Solution Approach 1:
The patent enhances the feedback mechanism to specifically indicate control channel detection status. The UE sends an acknowledgement signal on shared UL control resources that explicitly conveys whether the control channel was successfully detected or missed. This refined feedback allows the gNB to distinguish between successful detection and missed detection, enabling appropriate actions to be taken in each case.
Solution Approach 2:
The patent performs preliminary detection of control channel missed detection status before initiating retransmission. By using the acknowledgement signal on shared UL control resources to detect missed detection in advance, the system can take preliminary actions to adjust retransmission strategies, ensuring that control channel missed detection is not overlooked while maintaining spectrum efficiency through early termination when appropriate.
Data Source
AI summary
In the present invention, a common UL control channel resources is configured and scheduled for sharing among URLLC UEs (102) within a servicing cell. An enhanced HARQ-less transmission technique (20) is employed for delivering DL URLLC data packets to the intended UEs (102). On DL URLLC data transmission basis, via a scheduling DCI, a gNB (101) dynamically indicates to the intended URLLC UE (102), the UL control resource including the time slots for use in transmitting limited acknowledge information.