Cross-Link Interference Measurement Filtering for Absent Aggressor UEs
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Solution Overview
Problem
Wireless communication systems face challenges in accurately measuring cross-link interference (CLI) due to aggressor UEs not transmitting signals during CLI measurement occasions, leading to inaccurate filtered CLI measurement values and inefficient resource scheduling.
Innovation Solution
A user equipment (UE) identifies CLI measurement occasions where aggressor UEs do not transmit, filters measurements accordingly, and adjusts a coefficient value based on the number of discarded measurements, using counters to determine when to transmit a measurement indicating no CLI detection, thereby providing accurate CLI measurement reports to the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a UE performs CLI measurements during all CLI measurement occasions, then the quantity of measurements increases, but the measurement precision deteriorates due to inclusion of invalid measurements where aggressor UEs do not transmit
Solution Approach 1:
The patent extracts and removes invalid CLI measurements from the measurement set by identifying when aggressor UEs do not transmit signals during CLI measurement occasions. The UE determines a second subset of measurements that do not satisfy the CLI measurement threshold (indicating no transmission) and excludes these from filtering, thereby preventing contamination of the filtered CLI measurement value with invalid data.
Solution Approach 2:
The patent applies preliminary action by checking whether aggressor UEs are transmitting before performing CLI measurements. The UE determines a first subset of measurements that satisfy the CLI measurement threshold (indicating transmission present) and only applies filtering to this subset, ensuring that measurements are processed only when valid signal conditions exist.
2Productivity
If the UE applies filtering to all CLI measurements, then the productivity of measurement processing increases, but the reliability of the filtered CLI measurement value deteriorates due to invalid measurements
Solution Approach 1:
The patent performs preliminary classification of CLI measurements into two subsets before filtering: a first subset where measurements satisfy the CLI measurement threshold (indicating aggressor UE transmission) and a second subset where measurements do not satisfy the threshold (indicating no transmission). The filtering operation is then selectively applied only to the first subset, ensuring reliability while maintaining processing efficiency.
Solution Approach 2:
The patent applies local quality by treating different subsets of CLI measurements differently based on their validity. Instead of uniform filtering across all measurements, the UE applies filtering only to valid measurements (first subset) and suppresses filtering for invalid measurements (second subset), thereby maintaining local appropriateness of the processing operation.
3Reliability
If the UE suppresses filtering for measurements below threshold, then the reliability of filtered CLI measurement value is improved, but the device complexity increases due to subset management and filter suppression control
Solution Approach 1:
The patent uses parameter changes by dynamically adjusting the filter application state based on the CLI measurement threshold satisfaction. The UE changes the filter parameter (application vs. suppression) according to whether measurements fall below or above the threshold, allowing reliable differentiation between valid and invalid measurements through a simple parameter-based control mechanism.
4Productivity
If the base station schedules communications without accurate CLI measurements, then the productivity of resource scheduling increases, but the object-affected harmful factors increase due to interference
Solution Approach 1:
The patent implements feedback by having the UE transmit the filtered CLI measurement value to the base station, which then uses this accurate measurement information to schedule communications. The base station receives the CLI measurement report and schedules communications with the UE and other UEs based on the reported filtered CLI value, thereby reducing cross-link interference through informed scheduling decisions.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Generally, the described techniques provide for measuring, filtering, and reporting cross-link interference (CLI) in cases where not all aggressor user equipments (UEs) are transmitting signals that can be measured by a victim UE. A UE may obtain a set of CLI measurements by performing CLI measurements during a set of CLI measurement occasions. The UE may determine a first subset of the set of CLI measurements that satisfy a CLI measurement threshold and a second subset of the set of CLI measurements that do not satisfy the CLI measurement threshold. The UE may apply a filter to the first subset of the set of CLI measurements, and suppress the filter for the second subset of the set of CLI measurements, to obtain a filtered CLI measurement value. The UE may transmit the filtered CLI measurement value to a base station.