Configured Grant Resource Modes for NR-U LBT Failures
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Solution Overview
Problem
The challenges of supporting Ultra-Reliable and Low Latency Communications (URLLC) services in New Radio Unlicensed (NRU) scenarios, particularly in interference-controlled, uncontrolled, and partially-controlled scenarios, are not adequately addressed by existing technologies, leading to inefficiencies in CG resource management and potential LBT failures.
Innovation Solution
The terminal device determines CG resource usage modes, configurations, and parameters based on environment indication information from the network device, employing autonomous transmission and HARQ process selection to manage CG resources effectively, including mechanisms for handling LBT failures and resource conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Configured Grant resources are used in NRU scenarios, then data transmission can proceed without dynamic scheduling, but interference from LBT failures and resource conflicts increases
Solution Approach 1:
The terminal device performs Listen-Before-Talk (LBT) assessment and determines CG resource usage mode in advance before actual data transmission. This preliminary action allows the system to proactively identify potential interference issues and select appropriate transmission modes, thereby maintaining both high productivity through autonomous transmission and high reliability by avoiding LBT failures.
Solution Approach 2:
The system dynamically adjusts CG resource usage mode based on real-time LBT assessment results and channel conditions. The terminal can switch between different CG resource usage modes (e.g., autonomous transmission, scheduled transmission) depending on the detected interference level, thus adapting to varying channel environments to maintain both transmission efficiency and reliability.
2Loss of time
If autonomous transmission mode is used for CG resources, then latency is reduced, but interference from uncontrolled scenarios increases
Solution Approach 1:
The terminal performs LBT assessment and determines the usage mode for CG resources before autonomous transmission. This preliminary channel assessment ensures that autonomous transmission only occurs when the channel is clear, thereby achieving low latency while avoiding transmission into interfered channels.
Solution Approach 2:
The system changes transmission parameters (such as LBT category, contention window size, and CG resource configuration) based on detected interference levels. In low-interference scenarios, aggressive parameters enable low-latency autonomous transmission, while in high-interference scenarios, conservative parameters reduce LBT failures, thus adapting to balance latency and interference.
3Adaptability or versatility
If multiple CG resource configurations are supported, then adaptability to different services is improved, but device complexity increases
Solution Approach 1:
The system segments CG resources into multiple configurations, each optimized for specific service types (e.g., URLLC, eMBB). The terminal device determines which CG resource configuration to use based on the service requirements and current channel conditions. This segmentation allows the system to support diverse services with specialized configurations while managing complexity through structured resource organization.
Solution Approach 2:
The terminal device autonomously determines the appropriate CG resource usage mode and configuration based on pre-configured parameters and real-time LBT assessment, without requiring continuous network intervention. This self-service capability enables the terminal to adapt to different service requirements and channel conditions independently, improving versatility while reducing the complexity of network-side resource management.
Data Source
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AI summary
The embodiments of the present invention provide a data communication method, a terminal device and a network device, which are used by a terminal device to determine, according to a first environment and/or configured grant (CG) resource configuration information, at least one of a CG resource usage mode, a CG resource configuration mode or a CG resource configuration parameter, so as to improve the definition and transmission of a CG resource. The embodiments of the present invention may comprise: a terminal device determining, according to a first environment and/or configured grant (CG) resource configuration information, at least one of a CG resource usage mode, a CG resource configuration mode or a CG resource configuration parameter, the first environment being determined by the terminal device according to first environment indication information issued by a network device, and the CG resource configuration information being issued by the network device.