Autonomous UE Cross-Link Interference Detection
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Solution Overview
Problem
Current cross-link interference (CLI) measurement techniques in 5G NR TDD systems result in significant signaling overhead and energy consumption for UEs, as all UEs are required to measure and report CLI, regardless of whether they are exposed to interference or not.
Innovation Solution
The proposed solution involves UEs autonomously detecting nearby UEs via D2D communications and measuring CLI based on sidelink information, rather than relying on gNBs to schedule and coordinate CLI measurements. This approach reduces unnecessary CLI measurements and signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all UEs are required to measure and report CLI as per conventional techniques, then CLI measurement coverage is improved, but signaling overhead and energy consumption increase significantly
Solution Approach 1:
The patent applies local quality by enabling only specific UEs that are actually exposed to cross-link interference to perform CLI measurements and reporting, rather than requiring all UEs to do so. The serving gNB identifies UEs affected by CLI based on TDD configuration information from neighboring gNBs, and selectively configures measurement tasks only for those UEs. This resolves the contradiction by localizing the measurement function to only where it is needed, reducing overall signaling overhead and energy consumption while maintaining adequate CLI measurement coverage.
2Measurement precision
If gNBs coordinate CLI measurements through signaling, then CLI mitigation accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts and removes unnecessary CLI measurement configuration and reporting signaling for UEs that are not exposed to interference. By using local quality information (TDD configuration patterns) to identify affected UEs, the system extracts only the minimal necessary signaling for those specific cases, eliminating the bulk of signaling overhead that would be required if all UEs were configured. This resolves the contradiction by taking out the excess signaling while preserving the essential coordination needed for accurate CLI mitigation.
3Loss of information
If autonomous UE detection is implemented, then signaling overhead is reduced, but measurement reliability may be compromised
Solution Approach 1:
The patent introduces the serving gNB as an intermediary that mediates between autonomous UE detection and reliable CLI measurement. The gNB receives TDD configuration information from neighboring gNBs, identifies which UEs are exposed to CLI based on this information, and selectively configures measurement tasks for those specific UEs. This intermediary approach maintains measurement reliability through network-coordinated identification while achieving signaling overhead reduction by avoiding configuration for all UEs, thus resolving the contradiction.
Data Source
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AI summary
It is provided a method, comprising obtaining, in a sidelink communication, an information about a resource on which a terminal transmits a reference signal; measuring a received power on the resource; providing an information on the received power; and using the information to mitigate cross link interference.