CG-PUSCH Channel Access Switching Under Unlicensed Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge of switching between No-LBT and LBT channel access mechanisms in unlicensed spectrum communication systems, particularly in new radio (NR) systems, is unresolved, affecting data transmission reliability and efficiency.
Innovation Solution
User equipment (UE) determines channel interference parameters and switches from No-LBT to LBT mode when interference exceeds a threshold, ensuring reliable data transmission by performing LBT before accessing the channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If No-LBT mode is used for CG-PUSCH transmission, then transmission efficiency is improved, but transmission reliability deteriorates due to channel interference
Solution Approach 1:
The patent implements dynamic switching between No-LBT and LBT modes based on real-time channel interference conditions. The UE monitors channel quality indicators (RSRP, SINR, BLER) and adapts the channel access mechanism accordingly, transitioning from static to dynamic operation to balance efficiency and reliability.
Solution Approach 2:
The patent changes the operational parameters of the channel access mechanism by switching between different LBT variants (Type 1, Type 2a, Type 2b) and adjusting transmission parameters (power, MCS) based on interference levels. This parameter adaptation allows the system to optimize performance under varying channel conditions.
2Reliability
If LBT mode is used for CG-PUSCH transmission, then transmission reliability is improved, but transmission efficiency deteriorates due to additional monitoring and switching overhead
Solution Approach 1:
The patent applies different channel access mechanisms to different transmission scenarios and channel conditions. Instead of uniformly applying LBT or No-LBT, the system selects the appropriate mode locally based on specific interference conditions, UE capabilities, and service requirements, optimizing the balance between reliability and efficiency for each scenario.
Solution Approach 2:
The patent implements partial LBT operation by using No-LBT for configured grants while applying LBT only when interference thresholds are exceeded. This partial application of LBT reduces overhead compared to continuous LBT while maintaining reliability when needed, avoiding excessive action.
3Reliability
If channel interference monitoring is implemented, then transmission reliability is improved, but device complexity increases
Solution Approach 1:
The UE autonomously monitors channel interference conditions and performs self-adjustment of the channel access mechanism without requiring complex network control or coordination. The device uses pre-configured thresholds and autonomously decides when to switch modes, reducing overall system complexity while maintaining reliability.
Solution Approach 2:
The patent implements feedback mechanisms where the UE monitors channel quality indicators (RSRP, SINR, BLER) and uses this feedback to adjust transmission parameters and channel access mode. This closed-loop feedback enables reliable operation while keeping device complexity manageable through rule-based decision making.
Data Source
AI summary
A method for communication, the method being applied by a user equipment and including: in response to determining that a configured grant physical uplink shared channel (CG-PUSCH) is configured and an access mechanism is No-LBT, determining whether a channel interference parameter is greater than a first threshold; and in response to determining that the channel interference parameter is greater than the first threshold, switching to an LBT mode to transmit the CG-PUSCH.