Cross-Link Interference Measurement via Access Node Information Exchange
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Solution Overview
Problem
In NR networks with dynamic TDD operation, cross-link interference (CLI) management is hindered by the lack of information exchange between cells regarding UE-to-UE CLI reference signal transmission resources, leading to inefficient CLI measurement and reporting.
Innovation Solution
Implementing a cross-link interference information exchange procedure between access nodes, where a gNB sends a request message to a neighboring gNB, receiving a response with TDD DL/UL configurations and UE CLI RS transmission configurations, enabling coordinated CLI-RS configurations and resource management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CLI measurement is performed without information exchange between cells, then measurement process is simple, but CLI measurement accuracy deteriorates due to UEs attempting to measure signals from non-transmitting neighboring UEs
Solution Approach 1:
The patent applies preliminary action by having access nodes exchange TDD configuration information and UE CLI RS transmission configurations before CLI measurement is performed. This advance information exchange enables UEs to know which neighboring UEs will actually transmit CLI-RS signals, preventing wasted measurement attempts and improving measurement accuracy while maintaining manageable procedural complexity through standardized signaling.
2Measurement precision
If detailed TDD configuration information is exchanged between access nodes, then CLI measurement accuracy improves, but signaling overhead increases
Solution Approach 1:
The patent extracts only the essential information needed for CLI measurement from the complete TDD configuration - specifically the TDD DL/UL configuration indicators and UE CLI RS transmission configurations. By taking out only these critical elements rather than exchanging entire configuration datasets, the patent achieves accurate CLI measurement while minimizing signaling overhead between access nodes.
3Object-affected harmful factors
If CLI-RS transmission resources are coordinated between cells, then cross-link interference is reduced, but network coordination complexity increases
Solution Approach 1:
The patent implements feedback by having access nodes share UE CLI RS transmission configurations with neighboring access nodes. This feedback mechanism enables coordinated CLI-RS resource allocation where each node adjusts its resource assignments based on information received from neighbors, effectively reducing cross-link interference while maintaining coordination complexity at manageable levels through iterative information exchange.
Data Source
AI summary
In NR networks with dynamic TDD operation, two types of cross-link interference (CLI) arise: UE-to-UE and TRP-to-TRP. UE-to-UE CLI measurement and reporting can assist the network in managing CLI. The problem is that, for a cell to be able to measure the CLI reference signal transmitted by UEs in another neighboring cell, the cell needs to know what CLI-RS transmission resources assigned to the UEs in the neighboring cells. Embodiments of the present disclosure provide systems and methods for the exchange of such information between cells. In some embodiments, for example, a gNB sends a request message to a neighboring gNB and the neighboring gNB sends back a response message that includes TDD DL/UL Configurations of its cells and a list of the resources assigned to its UEs for transmission of UE-to-UE CLI reference signal.