Multi-Beam CLI Measurement for Beam Pairing and TDD Adjustment
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently measuring and managing cross-link interference (CLI) in multiple directions, which can lead to inefficient beam pairing and TDD configuration, increased interference, and reduced system latency.
Innovation Solution
A user equipment (UE) measures CLI in multiple receive directions using configured resources and beams, such as CSI-RSs and SSBs, and reports these measurements to the base station, allowing for improved beam selection and TDD adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CLI measurement is performed in multiple directions using multiple receive beams, then measurement precision and system efficiency are improved, but device complexity and measurement time increase
Solution Approach 1:
The patent segments the CLI measurement process by dividing it into multiple receive beam directions. Each receive beam is configured with specific measurement resources (CLI measurement resources), allowing the UE to perform measurements in a structured, segmented manner across different spatial directions rather than as a single complex omnidirectional measurement.
Solution Approach 2:
The patent introduces a spatial dimension to CLI measurements by implementing multi-directional measurements using multiple receive beams. This transforms the measurement from a single-point or single-direction approach into a multi-dimensional spatial measurement system, enabling the UE to capture interference characteristics from different angular directions.
2Productivity
If CLI measurement is performed in multiple directions using multiple receive beams, then system efficiency is improved, but measurement time and latency increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring the UE with multiple receive beams and their associated CLI measurement resources before actual measurements are performed. The base station provides configuration information including reference signal indices and beam directions in advance, so that when measurements are needed, the UE can immediately execute them without time-consuming setup procedures.
Solution Approach 2:
The patent implements periodic action through configured CLI measurement resources that are periodically available for measurements. The measurement process is organized into periodic measurement opportunities across different receive beams, allowing the system to balance comprehensive measurement coverage with controlled measurement timing and resource utilization.
3Ease of operation
If implicit beam identification based on downlink signals is used, then ease of operation is improved, but measurement precision may be compromised
Solution Approach 1:
The patent uses downlink reference signals (such as CSI-RS or SSB) as intermediaries to identify and select receive beams for CLI measurements. Instead of requiring complex direct beam selection or exhaustive scanning, the UE leverages these intermediary reference signals that are already transmitted by the base station, making beam identification easier while maintaining measurement accuracy through the use of these calibrated reference signals.
Data Source
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Figure 3A~3B
AI summary
Methods, systems, and devices for wireless communications are described. Generally, a base station may configure one or more cross-link interference measurement resources on which a user equipment (UE) is to measure CLI. The UE may measure CLI from a single aggressor UE in multiple receive directions. The UE may identify receive beams on which it receives other signal types, and use those receive beams to measure CLI. In some examples, the base station may explicitly indicate to the UE which receive beams it is to use for CLI measurements. The UE may measure CLI on each CLI measurement resource using the identified receive beam, and may transmit, to the base station, a CLI report including CLI measurements, an indication of resource on which CLI measurements were taken, or a combination thereof.