Link Adaptation for Unlicensed CG PUSCH via COT-Based Resource Selection
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Solution Overview
Problem
Current link adaptation mechanisms for Configured Grant Physical Uplink Shared Channel Transmission (CG PUSCH) in New Radio (NR) face challenges in flexible channel access, leading to increased latency and complexity for User Equipment (UE) and base station (gNB) detection, particularly due to autonomous transmit power adaptation and high Modulation and Coding Scheme (MCS) configurations.
Innovation Solution
A link adaptation mechanism is proposed where the User Equipment (UE) receives configurations for multiple candidate resources from the gNB, selecting a target resource based on the availability of Channel Occupancy Time (COT) initiated by the gNB, allowing for flexible channel access with simplified UE operation and gNB detection, and adjusting transmit power and MCS to ensure reliable decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If autonomous transmit power adaptation and high MCS configurations are used for CG PUSCH transmission, then transmission reliability is improved, but UE complexity and detection complexity increase
Solution Approach 1:
The patent segments the resource configuration into multiple candidate resources with different parameters (MCS, transmit power, time resources). The gNB configures a set of candidate resources, and the UE selects one based on channel conditions, dividing the complex adaptation task into manageable discrete options rather than continuous optimization
Solution Approach 2:
The patent changes multiple parameters (MCS index, transmit power level, time resource allocation) simultaneously across different candidate resources. By pre-configuring diverse parameter combinations and allowing UE selection based on channel quality, the system achieves reliable transmission without requiring complex real-time adaptation algorithms at the UE
2Adaptability or versatility
If multiple candidate resources are configured for CG PUSCH transmission, then channel access flexibility is improved, but resource management complexity increases
Solution Approach 1:
The patent introduces dynamic resource selection where the UE can choose different candidate resources based on real-time channel conditions and COT availability. The resource configuration is static but the resource selection is dynamic, allowing flexible channel access without complex resource management through predefined selection criteria
Solution Approach 2:
The gNB performs preliminary action by pre-configuring multiple candidate resources with different parameters before transmission. This advance preparation eliminates the need for complex real-time resource management during transmission, as the UE simply selects from pre-evaluated options based on current channel conditions
3Loss of time
If UE selects target resource based on COT availability, then transmission latency is reduced, but detection complexity at gNB increases
Solution Approach 1:
The patent implements feedback mechanisms where the gNB monitors which candidate resource the UE selected and provides feedback through ACK/NACK or uplink grants. This feedback loop allows the gNB to detect and measure the selected resource without increasing complexity, as the detection is based on predefined patterns and feedback signals rather than complex analysis
Data Source
AI summary
Embodiments of the present disclosure relate to devices, methods, apparatuses and computer readable storage media of link adaptation with unlicensed channel access of CG PUSCH. The method comprises receiving, at a first device and from a second device, a configuration of at least two candidate resources for a transmission from the first device to the second device, selecting, from the at least two candidate resources, a target resource for the transmission based on an availability of a channel occupancy time, COT, initiated by the second device for the transmission, and performing the transmission based on the selected target resource. This solution facilitates low latency CG PUSCH operation, where channel access probability can be improved by Tx power adjustment when needed, by allowing the UE to select the most appropriate CG-PUSCH resource. In this way, the use of CG PUSCH resources may be more effective and the UE operation and the gNB detection can also be simplified.