Slot Format Indicators in DCI for Cross-Link Interference Measurement
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Solution Overview
Problem
Existing wireless communication systems face challenges in dynamically managing cross-link interference (CLI) due to dynamically configured slot formats, leading to suboptimal CLI measurement and synchronization issues, which affect communication quality and efficiency.
Innovation Solution
A base station dynamically configures CLI measurement resources at a UE by transmitting a slot format indicator (SFI) within DCI, allowing the UE to determine time-domain resources for optimal CLI measurement based on current slot formats, enabling accurate CLI reporting and improved scheduling decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If slot formats are dynamically configured to improve communication flexibility, then adaptability is improved, but CLI measurement accuracy deteriorates due to synchronization issues
Solution Approach 1:
The patent implements dynamic CLI measurement resource configuration that adapts to changing slot formats. The network configures multiple CLI measurement resources with different time-domain locations, and the UE dynamically selects which resource to use based on the current active slot format indicated by DCI signaling. This dynamic adaptation resolves the contradiction by allowing the system to maintain measurement accuracy despite slot format changes.
Solution Approach 2:
The patent changes the parameter of CLI measurement resource selection based on slot format indicators. When the slot format changes, the UE receives updated DCI signaling that indicates which pre-configured CLI measurement resource should be used. This parameter change mechanism ensures that CLI measurements remain accurate while the system maintains flexible slot format configuration.
2Measurement precision
If multiple CLI measurement resources are configured to improve measurement accuracy, then CLI measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple CLI measurement resources with different time-domain locations before actual CLI measurement begins. The network provides RRC configuration that includes multiple measurement resource definitions, and the UE stores these for later selection based on slot format conditions. This preliminary configuration reduces real-time decision complexity while maintaining measurement accuracy.
Solution Approach 2:
The patent introduces DCI signaling as an intermediary that mediates between the multiple pre-configured CLI measurement resources and the UE's selection process. Instead of the UE directly managing complex resource selection logic, the network uses DCI to indicate which pre-configured resource should be used, simplifying UE implementation while enabling accurate CLI measurement adaptation.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some systems, a base station may transmit a slot format indicator (SFI) to a first user equipment (UE) via downlink control information (DCI) and the first UE may use the SFI to determine time-domain resources over which the first UE may measure cross link interference (CLI) arising from a transmission from a second UE. The first UE may use the SFI as an index into a slot format combination table, which may also be used for uplink and downlink scheduling or may be exclusively used for determining the time-domain resources for CLI measurement. The first UE may determine a set of slot formats from a slot format table based on a slot format combination corresponding to the SFI index and may determine over which symbols the first UE may measure CLI based on the set of slot formats.