Slot Format Information Reception in Unlicensed Wireless Systems
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Solution Overview
Problem
In wireless communication systems, especially in unlicensed bands, user equipment (UE) faces challenges in maintaining stable access due to unpredictable resource availability, making it difficult for networks to know when UE operates, and thus requiring predefined agreements for stable communication.
Innovation Solution
A method for a UE to receive Slot Format related Information (SFI) from a base station, where SFI is transmitted in every predetermined slot number or time, allowing the UE to perform wireless communication based on the applied slot format, even if not received in scheduled slots, and applying the slot format from the received SFI or a subsequent slot with an offset value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If slot format information is transmitted dynamically in unlicensed bands, then communication flexibility is improved, but timing synchronization and access stability deteriorate due to unpredictable resource availability
Solution Approach 1:
The patent applies preliminary action by transmitting slot format information (SFI) in advance at predetermined intervals before the actual slot occurs. This allows the UE to know the slot format configuration ahead of time, enabling proper timing synchronization and stable access planning. The SFI is transmitted at fixed periodic intervals (e.g., every 4, 5, or 10 slots) regardless of dynamic channel conditions, providing a predictable timing structure that resolves the contradiction between flexibility and stability.
2Loss of time
If SFI is transmitted at every predetermined slot, then timing synchronization is improved, but signaling overhead increases
Solution Approach 1:
The patent implements periodic action by transmitting SFI at predetermined periodic intervals rather than at every slot. The network configures the UE with a periodicity value (e.g., 4, 5, 10 slots), and SFI is transmitted only at these periodic intervals. This reduces signaling overhead compared to transmitting at every slot, while still maintaining adequate timing synchronization for UE operations. The periodic transmission pattern creates a predictable rhythm that balances synchronization needs with overhead reduction.
3Productivity
If slot format changes frequently to adapt to channel conditions, then communication efficiency is improved, but UE operation stability deteriorates
Solution Approach 1:
The patent applies dynamics by allowing the slot format to change at predetermined intervals while maintaining stability within each interval. The SFI transmission periodicity is configured to balance between adapting to channel conditions and maintaining UE operation stability. Within each periodic interval, the slot format remains stable for UE operations, while between intervals, the format can change to adapt to new channel conditions. This dynamic periodic structure resolves the contradiction between efficiency and stability.
Data Source
AI summary
The present disclosure relates to a method for receiving Slot Format related Information (SFI) performed by a user equipment (UE) in a wireless communication system including receiving the SFI from a base station, wherein the SFI is information informing a slot format for at least one slot; and performing a wireless communication in the unlicensed band based on an application of the slot format to the at least one slot, wherein the SFI is received in every predetermined slot number or in every predetermined time.