UE Cross-Link Interference Measurement via RSSI Reporting
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Solution Overview
Problem
Cross-link interference in New Radio (NR) dynamic TDD operation becomes significant at high traffic loads, limiting performance gains, and existing solutions require complex inter-cell signaling for interference management.
Innovation Solution
A method where user equipment (UE) performs measurements of cross-link interference based on received signal strength indicators (RSSI) without knowledge of specific sequences, reporting these measurements to network nodes to enable efficient interference management without inter-cell signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic TDD operation is used to maximize radio resource utilization, then system performance is improved at low to medium loads, but cross-link interference increases at high traffic loads
Solution Approach 1:
The patent performs RSSI measurements on future uplink slots before actual uplink transmissions occur. By measuring the received signal strength indicator in advance on resources that will be used for uplink transmission, the system can identify potential cross-link interference from downlink transmissions before they cause harm to ongoing uplink communications.
Solution Approach 2:
The patent implements a feedback mechanism where measurement results (RSSI values) are reported from the user equipment to the network node. This feedback enables the network to adjust future dynamic TDD configurations based on observed interference levels, allowing the system to adapt and optimize resource allocation to minimize cross-link interference while maintaining high resource utilization.
2Object-affected harmful factors
If inter-cell signaling is used for interference management, then cross-link interference can be controlled, but system complexity increases
Solution Approach 1:
The patent enables user equipment to autonomously perform RSSI measurements and generate measurement reports without requiring complex inter-cell signaling coordination. The UE self-services the interference measurement function by locally measuring received signal strength on configured uplink resources and reporting results to its serving network node, eliminating the need for complicated signaling exchanges between neighboring cells.
Solution Approach 2:
The patent extracts the interference measurement and reporting function from the network infrastructure and places it at the user equipment. Instead of requiring network nodes to coordinate and exchange interference information, the measurement capability is taken out and distributed to UEs, which perform measurements and report findings independently to their serving network nodes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for low-complexity UE-to-UE interference measurement and identification of aggressor UEs, reducing cross-link interference and improving overall system performance with minimal overhead.
Implementation Method 1
performing one or more measurements on each of the one or more sets of time and frequency resources. In certain embodiments, performing one or more measurements on each of the one or more sets of time and frequency resources comprises performing an RSSI measurement on each of the one or more sets of time and frequency resources
Data Source
AI summary
A method in a user equipment (UE) (110B) is disclosed. The method comprises obtaining (404) an indication of one or more sets of time and frequency resources to be measured by the UE. The method comprises performing (408) one or more measurements on each of the one or more sets of time and frequency resources. The method comprises reporting (412), to a network node (115), a measurement value for each of the one or more sets of time and frequency resources, the measurement value indicative of cross-link interference at the UE due to transmissions by one or more different UEs (110A, 110C, 110D, 110E).