Slot Format Rules for Intra-Frequency CLI Measurement
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently measuring intra-frequency cross link interference (CLI) due to overlapping symbols and control signaling types, leading to inconsistent and inefficient CLI measurement practices.
Innovation Solution
A method and apparatus for determining slot formats based on control signaling types, such as semi-static and dynamic control signaling, to accurately measure CLI by distinguishing between downlink, uplink, and flexible symbols, thereby optimizing CLI measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CLI measurement is performed on all resources regardless of symbol type, then measurement coverage is maximized, but measurement accuracy deteriorates due to interference from uplink symbols
Solution Approach 1:
The patent applies local quality by differentiating measurement rules based on the specific symbol type (downlink, uplink, or flexible) of each resource element. Instead of applying a uniform measurement rule across all resources, the UE adapts its measurement behavior to the local characteristics of each symbol, measuring CLI only on downlink symbols and flexible symbols under specific conditions, while avoiding measurement on uplink symbols to prevent interference contamination.
2Measurement precision
If CLI measurement is restricted only to downlink symbols, then measurement accuracy is improved, but measurement opportunities are reduced due to limited downlink symbol availability
Solution Approach 1:
The patent implements dynamics by making the CLI measurement decision adaptive rather than static. The UE dynamically determines whether to measure CLI on flexible symbols based on real-time slot format information and symbol type indications. This dynamic approach allows the system to maximize measurement opportunities by utilizing flexible symbols when appropriate while maintaining measurement accuracy by avoiding uplink symbols, thus resolving the contradiction between accuracy and efficiency.
3Productivity
If the UE measures CLI on flexible symbols without additional control signaling, then measurement efficiency is improved, but measurement reliability deteriorates due to uncertainty about symbol type
Solution Approach 1:
The patent applies feedback by introducing control signaling (such as slot format indication or symbol type indication) that provides explicit information about the type of each symbol. This feedback mechanism allows the UE to reliably determine whether a flexible symbol is suitable for CLI measurement, thereby maintaining measurement reliability while still enabling efficient utilization of flexible symbols for measurement purposes.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive control signaling indicating a resource for measuring cross link interference (CLI). The UE may determine that the resource overlaps with (e.g., at least partially overlaps) one or more symbols or a transmission occasion. The UE may determine, according to what the resource overlaps with, whether to measure CLI over the resource. For example, if one or more of the symbols is uplink or if the resource overlaps a transmission occasion, the UE may not measure CLI. If one or more of the symbols are downlink, the UE may measure CLI. If one or more of the symbols is flexible or has an unknown type, the UE may determine whether to measure CLI based on a type of the control signaling.