PDCCH COT Triggering for FBE Uplink Scheduling Delays
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Solution Overview
Problem
In frame-based equipment (FBE) mode of wireless communication, inefficiencies arise due to UE processing delays, necessitating improved resource utilization methods.
Innovation Solution
A method involving a base station transmitting a channel occupancy time (COT) indicator and downlink control information (DCI) in a fixed frame period (FFP) to a user equipment (UE), followed by the UE transmitting uplink data in a subsequent FFP based on the DCI, to efficiently manage channel access in shared spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE performs LBT procedure and waits for processing delay in FBE mode, then channel access reliability is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The base station performs preliminary actions by transmitting the COT indicator in advance during the first FFP, notifying the UE of the channel occupancy time before the actual uplink transmission. This allows the UE to prepare its transmission in advance, reducing the impact of processing delays and improving resource utilization efficiency while maintaining channel access reliability through the structured FBE LBT procedure.
2Manufacturing precision
If UE waits for processing delay after receiving DCI, then transmission accuracy is improved, but time efficiency deteriorates
Solution Approach 1:
The base station transmits the DCI in advance during the first FFP, containing uplink scheduling information and resource allocation details. The UE receives and processes this information beforehand, preparing the uplink transmission in advance. This preliminary action reduces the effective processing delay impact while maintaining transmission accuracy through proper signal processing.
Solution Approach 2:
The system dynamically adjusts the timing relationship between DCI reception and uplink transmission by utilizing the structured FBE frame structure. The UE can optimize its processing timeline within the defined FFP boundaries, balancing transmission accuracy requirements with time efficiency by preparing transmissions during available processing windows.
3Productivity
If UE transmits uplink data in subsequent FFP, then channel occupancy efficiency is improved, but processing complexity increases
Solution Approach 1:
The uplink transmission process is segmented into distinct phases: receiving the COT indicator in the first FFP, processing the DCI during the defined window, and transmitting uplink data in the subsequent FFP. This segmentation allows the UE to manage processing complexity by handling tasks in discrete, manageable steps rather than simultaneously, while maintaining channel occupancy efficiency through the structured timing.
Data Source
AI summary
Wireless communications systems and methods related frame-based equipment (FBE) communications in a wireless communication network are provided. A method of operating abase station (BS) includes transmitting a channel occupancy time (COT) indicator in a first fixed frame period (FFP) to a user equipment (UE) in frame based equipment (FBE) mode; transmitting downlink control information (DCI) during a window of the first FFP; and receiving uplink (UL) data from the UE during a second FFP following the first FFP according to the DCF A method of operating a UE includes receiving a COT indicator in a first FFP from a base station BS in FBE mode; monitoring a window of the first FFP; receiving a DCI during the window; and transmitting UL data to the BS during a second FFP following the first FFP according to the DCI.