Multi-slot SFI Overlap for Dynamic Spectrum Adaptation
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing slot format indications in shared and unlicensed spectra, particularly in dynamic environments where network operators must adapt transmission grants and schedules while minimizing collisions and maintaining power efficiency.
Innovation Solution
The implementation of overlapping multi-slot slot format indicators (SFIs) allows base stations to incrementally configure and update slot format information, enabling dynamic adjustments and power-saving strategies by indicating communication directions for multiple slots, including those outside transmission opportunities and across frequency carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a single multi-slot SFI is used to indicate slot formats for multiple slots, then signaling overhead is reduced, but the system cannot dynamically modify or cancel transmission grants after SFI is sent
Solution Approach 1:
The patent divides the slot format indication into multiple overlapping SFIs, where each SFI covers a specific time period and can be independently modified or canceled. This segmentation allows dynamic adjustment of transmission grants while maintaining reasonable signaling overhead by avoiding the need to indicate all slots in a single comprehensive SFI.
2Use of energy by moving object
If SFIs are configured to cover future slots in advance, then power efficiency is improved by enabling early sleep mode, but the system cannot adapt to LBT outcomes or medium access uncertainties in shared spectra
Solution Approach 1:
The patent implements dynamic SFI configurations where the slot format indication can be adjusted based on actual medium access outcomes from LBT procedures. The system transitions from static advance configuration to dynamic adaptation, allowing base stations to modify SFIs according to whether LBT succeeds or fails, thereby balancing power efficiency with adaptability to shared spectrum conditions.
3Adaptability or versatility
If overlapping multi-slot SFIs are implemented to enable dynamic adjustments, then adaptability is improved, but device complexity increases due to multiple SFI monitoring and conflict resolution
Solution Approach 1:
The patent establishes preliminary rules for resolving conflicts between overlapping SFIs, such as priority-based resolution or time-based validation. These pre-defined conflict resolution mechanisms reduce the complexity of real-time decision-making at the UE, as the device only needs to apply predetermined rules rather than perform complex real-time analysis when multiple SFIs overlap.
Data Source
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AI summary
Wireless communications systems and methods related to multi-slot slot format indicators (SFIs) are provided. In one embodiment, a first wireless communication device communicates, with a second wireless communication device, a first SFI for a first set of slots and a second SFI for a second set of slots overlapping with the first set of slots. The first wireless communication device communicates with the second wireless communication device based on at least one of the first SFI or the second SFI. In one embodiment, a first wireless communication device communicates, with a second wireless communication device, a configuration for a first slot and an SFI indicating slot formats for a set of slots including the first slot. The SFI indicates an unspecified slot format for the first slot. The first wireless communication device communicates with the second wireless communication device in the first slot based on the configuration.