UE-Initiated COT Configuration for Low-Latency FBE Uplink Access
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Solution Overview
Problem
In wireless communication systems operating in unlicensed spectrum, existing technologies face challenges in efficiently managing channel occupancy times (COT) for user equipment (UE) in frame-based equipment (FBE) mode, leading to inefficiencies in uplink transmissions, particularly for ultra-reliable low-latency communications (URLLC) traffic.
Innovation Solution
Configuring a UE-specific frame-based equipment (FBE) mode with a separate frame structure and initiating COTs independently of the base station's frame structure, allowing UEs to contend for and acquire COTs based on their traffic patterns, thereby optimizing channel access and resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE performs LBT procedure prior to scheduled UL transmission time, then channel access is ensured, but transmission latency increases when LBT fails
Solution Approach 1:
The gNB performs the LBT procedure in advance (prior to the scheduled UL transmission time) to determine channel availability. This preliminary action allows the UE to know whether to transmit or not, reducing uncertainty and enabling better latency management while ensuring reliable channel access when conditions permit.
Solution Approach 2:
The system dynamically adjusts the timing and flexibility of UL transmissions based on LBT outcomes. When LBT is successful, the UE can transmit at the scheduled time or potentially earlier if channel conditions allow, creating a dynamic adaptation mechanism that balances reliability with latency reduction.
2Productivity
If UE is scheduled for UL transmission in unlicensed spectrum, then resource allocation is optimized, but channel access flexibility is reduced
Solution Approach 1:
The system introduces dynamic flexibility by allowing the UE to adjust its transmission timing based on LBT outcomes and channel conditions. The UE can transmit at the scheduled time or potentially earlier if the channel is available, creating a dynamic schedule that balances resource allocation efficiency with channel access flexibility.
Solution Approach 2:
The system changes the transmission timing parameter based on LBT results and channel availability. By adjusting the actual transmission time relative to the scheduled time, the system optimizes both resource utilization and channel access flexibility, allowing the UE to adapt to varying channel conditions while maintaining efficient resource usage.
3Reliability
If UE refrains from transmitting when LBT fails, then collision avoidance is achieved, but transmission opportunities are lost
Solution Approach 1:
The gNB performs LBT in advance to determine channel availability before the scheduled transmission time. This preliminary action allows the system to prepare for potential transmission opportunities while avoiding collisions, as the gNB has already assessed whether the channel is clear and can coordinate accordingly.
Solution Approach 2:
The system uses feedback from the LBT procedure to determine whether the UE should transmit or refrain from transmitting. The gNB and UE exchange information about channel availability and transmission decisions, creating a feedback mechanism that balances collision avoidance with maximizing transmission opportunities based on real-time channel conditions.
Data Source
AI summary
Wireless communication systems and methods related to configuration for user equipment (UE)-initiated channel occupancy time (COT) in a frame-based equipment (FBE) mode are provided. A user equipment (UE) receives, from a base station (BS), a configuration for the UE to initiate a COT in an FBE mode. The configuration indicates a first FBE frame period. The UE initiates the COT in a first FBE frame having the first FBE frame period. The UE transmits, to the BS during the COT, an uplink communication signal.