Wireless HARQ Feedback Control for URLLC and NRU Configured Grants
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Solution Overview
Problem
In the New Radio Unlicensed (NRU) spectrum scenario, there is a need to determine whether data on Ultra Reliable and Low Latency Communications (URLLC) CG resources and/or NRU CG resources should be automatically transmitted, as their configuration modes differ, posing a challenge in existing technologies.
Innovation Solution
A terminal device determines data transmission on CG resources based on indication information, utilizing different configuration modes for URLLC and NRU CG resources, and employs various transmission mechanisms to handle ACK/NACK indications for HARQ processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the network device uses a unified indication method for both URLLC CG resources and NRU CG resources, then the system complexity is reduced, but the transmission reliability and adaptability for different service types deteriorate
Solution Approach 1:
The patent segments the indication method by introducing separate indication fields in the DCI format: a first indication field for URLLC CG resources and a second indication field for NRU CG resources. This allows independent control and acknowledgment indications for different service types, resolving the contradiction by maintaining low complexity through unified DCI structure while achieving high reliability through service-specific indication fields.
Solution Approach 2:
The patent applies local quality by configuring different acknowledgment modes for different resource types: URLLC resources can use ACK/NACK indications while NRU resources may use different mechanisms. The network device can selectively enable or disable acknowledgment requirements based on the specific CG-ConfigIndex, allowing optimized reliability settings for each service type without affecting the other.
2Reliability
If the terminal device automatically retransmits data upon receiving NACK indication, then the transmission reliability is improved, but the latency and throughput efficiency worsen due to unnecessary retransmissions
Solution Approach 1:
The patent implements selective feedback mechanisms where the network device sends ACK/NACK indications only when necessary. For URLLC services, explicit ACK/NACK feedback is provided to ensure high reliability. For NRU services, the network can configure autonomous transmission without requiring explicit ACK/NACK feedback, thereby avoiding unnecessary retransmissions and reducing latency while maintaining adequate reliability.
Solution Approach 2:
The patent enables dynamic adjustment of retransmission behavior based on service type and network conditions. The terminal device can switch between autonomous transmission mode (without waiting for ACK/NACK) and feedback-based retransmission mode depending on the configured CG resources and service requirements, optimizing the balance between reliability and latency.
3Adaptability or versatility
If the network device configures separate indication mechanisms for URLLC and NRU CG resources, then the adaptability for different service types is improved, but the device complexity and processing overhead increase
Solution Approach 1:
The patent achieves universality by using a single DCI format (DCI format 0_2) that can serve multiple purposes: indicating uplink grants, providing HARQ acknowledgments, and configuring CG resources. The same DCI structure accommodates both URLLC and NRU services through configurable fields, reducing the need for separate indication mechanisms while maintaining service-specific functionality.
Solution Approach 2:
The patent utilizes parameter changes to differentiate service types within a unified framework. By configuring different values for parameters such as cg-DFI-RNTI, firstHARQ-ProcID-Offset, and secondHARQ-ProcID-Offset based on the CG-ConfigIndex, the system can adapt the indication mechanism behavior for different service types without changing the fundamental DCI structure, thus maintaining low complexity while achieving high adaptability.
4Measurement precision
If the terminal device monitors DFI for all CG resources, then the transmission accuracy is improved, but the processing overhead and power consumption increase
Solution Approach 1:
The patent segments the DFI monitoring requirement by service type. The terminal device is configured to monitor DFI only for specific CG resources based on service requirements. For URLLC services where high accuracy is critical, DFI monitoring is enabled. For NRU services where latency is more critical than absolute accuracy, DFI monitoring can be disabled or reduced, thereby reducing power consumption while maintaining sufficient transmission accuracy.
Solution Approach 2:
The patent applies partial action by having the terminal device monitor DFI only when necessary rather than continuously for all CG resources. The network device can selectively trigger DFI monitoring based on the HARQ process state and service type, reducing unnecessary monitoring activities and associated power consumption while maintaining transmission accuracy where required.
Data Source
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AI summary
Embodiments of the present application provide a wireless communication method, a terminal device, and a network device. The method comprises: an end device receives indication information, the indication information being an ACK/NACK indication of at least one HARQ process, and the HARQ process being a HARQ process corresponding to a first resource and/or a second resource, wherein configuration modes of the first resource and the second resource are different, so that the terminal device can process or not process data transmission on the second resource according to the indication information, and/or process data transmission on the first resource according to the indication information.