CLI-RS Configuration for Dynamic TDD Interference Mitigation
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Solution Overview
Problem
Cross-link interference (CLI) occurs in dynamic Time Division Duplex (TDD) systems due to uncoordinated transmissions between neighboring base stations, leading to communication errors, dropped packets, and inefficient resource utilization.
Innovation Solution
Implement methods and arrangements to measure and mitigate CLI by configuring cross-link interference reference signals (CLI-RS) for neighboring base stations, including transmission, measurement, and reporting of CLI-RSSI, CLI-RSRP, and CLI-SNIR, and adjusting transmission power or resource allocation to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic TDD is used to maximize resource utilization and improve throughput, then resource utilization and user equipment throughput are improved, but cross-link interference occurs between neighboring base stations
Solution Approach 1:
The patent applies preliminary action by configuring CLI-RS resources and measurement parameters in advance before actual data transmissions occur. The serving gNB pre-configures the UE with CLI-RS resource information, measurement bandwidth, and reporting criteria, enabling the UE to proactively measure and report CLI conditions before they degrade communication performance.
Solution Approach 2:
The patent implements feedback mechanisms where the UE continuously measures CLI-RS signals from neighboring gNBs and reports CLI metrics (such as RSRP or SINR) back to the serving gNB. This feedback loop enables the serving gNB to dynamically adjust uplink resource allocation, power control parameters, or TDD configuration based on real-time CLI conditions, resolving the interference while maintaining high resource utilization.
2Adaptability or versatility
If uncoordinated transmissions are allowed between neighboring base stations, then system flexibility and adaptability are improved, but communication errors and dropped packets increase
Solution Approach 1:
The patent introduces the CLI-RS signal as an intermediary element that mediates between uncoordinated transmissions from neighboring gNBs and the UE's reception. The CLI-RS provides a reference that enables the UE to measure and quantify the interference level, allowing the system to maintain transmission flexibility while ensuring communication reliability through informed resource management decisions.
Solution Approach 2:
The patent enables the UE to perform self-service by autonomously measuring CLI conditions using configured CLI-RS resources and generating measurement reports without direct intervention from the gNB. The UE independently evaluates CLI metrics and reports them according to predefined criteria, allowing the system to maintain flexibility while ensuring reliability through distributed intelligence.
3Reliability
If CLI measurement and mitigation procedures are implemented, then communication errors are reduced and resource utilization is optimized, but system complexity and measurement overhead increase
Solution Approach 1:
The patent applies local quality by configuring CLI-RS measurements selectively for specific UEs and specific neighboring gNBs based on local interference conditions, rather than requiring all UEs to measure all neighbors. The serving gNB can configure different CLI-RS resource sets, bandwidths, and reporting criteria tailored to each UE's specific CLI exposure, reducing overall system complexity while maintaining reliability where needed.
Solution Approach 2:
The patent implements partial action by requiring CLI measurements only when necessary - for example, only when the UE is in uplink transmission mode and neighboring gNBs are in downlink mode, or when CLI exceeds certain thresholds. The measurement and reporting can be triggered selectively rather than continuously, reducing overhead and system complexity while maintaining adequate communication reliability.
Data Source
AI summary
Logic may send information on cross-link interference reference signal (CLI-RS) resource and measurement configuration via an interface to a second base station, the CLI-RS resource and measurement configuration to comprise an identification of a communication resource within which to measure the CLI-RS. Logic may cause transmission of the CLI-RS. Logic may receive the CLI-RS measurement report based on measurement of the CLI-RS based on a definition for a CLI-RS measurement report from the second base station via the interface. Logic may decode information on CLI-RS resource and measurement configuration received via the interface from a first base station. Logic may measure the CLI-RS based on identification of the communication resource. Logic may generate the CLI-RS measurement report based on measurement of the CLI-RS. And logic may send the CLI-RS measurement report to the first base station.