Cross-Link Interference Mitigation With Coordinated SRS Measurement
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Solution Overview
Problem
Cross-link interference (CLI) occurs in dynamic Time Division Duplex (TDD) systems due to uncoordinated uplink and downlink transmissions between user equipment (UE) and base stations, leading to communication errors, dropped packets, and inefficient resource utilization.
Innovation Solution
Implement methods and arrangements to measure and mitigate CLI by scheduling sounding reference signal (SRS) transmissions from aggressor UEs, coordinating with neighboring base stations to adjust communication resources, and employing guard bands to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic TDD is used to maximize resource utilization and improve UE throughput, then resource utilization and throughput are improved, but cross-link interference occurs between uncoordinated uplink and downlink transmissions
Solution Approach 1:
The system performs preliminary actions by scheduling sounding reference signal (SRS) transmissions from aggressor UEs before actual data transmissions. This allows the network to identify potential CLI sources in advance and coordinate with neighboring base stations proactively, preventing interference before it affects resource utilization
Solution Approach 2:
The patent introduces an intermediary coordination mechanism between serving and neighboring base stations. The serving gNB exchanges CLI information with neighboring gNBs and coordinates resource allocation, acting as a mediator to resolve the conflict between dynamic resource utilization and interference prevention
2Adaptability or versatility
If uncoordinated uplink and downlink transmissions are allowed between neighboring cells, then flexibility and adaptability are improved, but communication errors and packet losses increase due to CLI
Solution Approach 1:
The system implements feedback mechanisms where UEs report SRS-RSSI measurements to their serving base stations. This feedback loop provides real-time information about CLI conditions, enabling the network to adjust transmission configurations dynamically while maintaining reliability
Solution Approach 2:
The coordinating base station acts as an intermediary that receives CLI information from the serving gNB and communicates with neighboring gNBs to resolve conflicts. This intermediary mechanism maintains transmission flexibility while ensuring communication reliability through coordinated resource management
3Object-affected harmful factors
If sounding reference signal transmissions are scheduled from aggressor UEs and CLI measurement is performed, then CLI mitigation capability is improved, but device complexity and measurement overhead increase
Solution Approach 1:
The patent reuses existing sounding reference signal (SRS) resources for dual purposes: normal uplink channel sounding and CLI measurement. This multi-functional approach enables CLI mitigation without requiring separate dedicated measurement resources, reducing overall system complexity
Solution Approach 2:
Victim UEs autonomously perform CLI measurements by monitoring SRS transmissions from aggressor UEs and reporting SRS-RSSI values to their serving base station. This self-service measurement approach distributes the measurement burden across UEs rather than requiring centralized complex measurement infrastructure
Data Source
AI summary
Logic may decode information on cross-link interference (CLI) measurement and report configuration received via a first downlink (DL) control information (DCI) from a first base station to comprise an identification of a communication resource within which to measure a sounding reference signal (SRS) or other uplink transmission and a definition for a CLI measurement report. Logic may measure the SRS or other uplink transmission based on the identification of the communication resource. Logic may generate the CLI measurement report based on measurement of the SRS or other uplink transmission. Logic may send the CLI measurement report. Logic may generate a CLI measurement and report configuration to comprise an identification of a communication resource within which to measure a SRS and a definition for a CLI measurement report. And logic may send the CLI measurement and report configuration via a DCI transmission to a first user equipment.