Periodic Channel Occupancy Sharing for Low-Latency UE Access
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Solution Overview
Problem
In the context of unlicensed spectrum communication, user equipment (UE) in semi-static channel access mode faces limitations in initiating channel occupancy, leading to increased transmission latency and reduced performance, particularly for latency-sensitive services like factory machine type communications and high-quality surveillance.
Innovation Solution
The UE is enabled to initiate periodic channel occupancy with a first period and indicate channel occupancy sharing with a base station or second UE using specific information, allowing UE-initiated channel access in a semi-static channel access mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the UE operates in semi-static channel access mode and cannot initiate channel occupancy, then the base station maintains control over channel access, but transmission latency increases and UE performance is limited
Solution Approach 1:
The patent transforms the static channel access mode into a dynamic one by enabling the UE to initiate channel occupancy when needed. The UE can switch from passive channel access to active channel initiation based on transmission requirements, allowing the system to adapt between base station-controlled and UE-initiated modes depending on traffic conditions and latency requirements.
Solution Approach 2:
The patent segments the channel access rights by introducing the concept of shared channel occupancy time (COT). Instead of the base station holding exclusive control, the COT is divided into portions that can be allocated to the UE for uplink transmission. This segmentation allows both the base station and UE to have controlled access periods, reducing overall latency while maintaining base station coordination.
2Reliability
If the base station shares channel occupancy time with the UE, then the UE can use LBT mode with higher priority and obtain the channel with greater probability, but the system complexity increases
Solution Approach 1:
The patent changes the LBT parameters available to the UE by allowing different priority levels based on the sharing arrangement. When the base station shares COT with the UE, the UE can use higher priority LBT modes (e.g., priority class 1 or 2) compared to when accessing the channel independently (priority class 3 or 4). This parameter change increases channel access probability without requiring fundamental system redesign.
3Reliability
If the UE cannot initiate channel occupancy in semi-static mode, then the base station maintains spectrum management control, but communication performance for latency-sensitive services deteriorates
Solution Approach 1:
The patent introduces the base station as an intermediary that coordinates the COT sharing arrangement. The base station receives uplink scheduling requests from the UE, decides whether to share COT, and provides appropriate grants. This intermediary role maintains base station control for spectrum management while enabling UE autonomy for latency-sensitive transmissions, achieving a balance between centralized control and distributed initiative.
Data Source
AI summary
Embodiments of the present application provide user equipment and a method of communication of the same. The method includes initiating a periodic channel occupancy with a first period and using a first information to indicate the initiated channel occupancy that is to be shared by a base station or a second UE. This can allow UE initiated channel occupancy and UE can share the initiated channel occupancy with the base station in a semi-static channel access mode, solve issues in the prior art, improve transmission latency, provide a good communication performance, and/or provide high reliability.