Remote Cross-Link Interference Measurement via Reference Signals
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Solution Overview
Problem
Current wireless communication systems face challenges in measuring and managing remote cross-link interference (CLI) between base stations, particularly due to environmental factors like atmospheric ducts, which can cause significant interference between distant base stations.
Innovation Solution
A method and apparatus for detecting and canceling remote CLI by broadcasting reference signals, acquiring information from adjacent base stations, and adjusting transmission power or skipping transmission at specific time-frequency resources to mitigate interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex communication is used to double system capacity, then transmission and reception can occur simultaneously, but cross-link interference occurs between base stations
Solution Approach 1:
The patent applies preliminary action by having base stations transmit reference signals before actual data transmission. These reference signals allow receiving base stations to measure and report CLI levels in advance, enabling the network to identify interference-prone base station pairs before full-duplex operation begins. This proactive measurement and reporting mechanism allows the system to preemptively manage interference while maintaining full-duplex capacity benefits.
2Length of moving object
If atmospheric duct effects are present, then radio signals can travel farther with less attenuation, but remote cross-link interference occurs between distant base stations
Solution Approach 1:
The patent implements feedback by establishing a closed-loop measurement and reporting system. Base stations transmit reference signals, receiving base stations measure CLI levels, and the measurements are reported back to the network. This feedback mechanism enables the system to adaptively respond to remote interference caused by atmospheric duct effects, allowing distant base stations to adjust their operations based on actual interference conditions rather than relying solely on distance-based assumptions.
3Measurement precision
If reference signals are broadcast for CLI measurement, then remote CLI can be detected and managed, but additional signaling overhead is introduced
Solution Approach 1:
The patent applies universality by designing reference signals that serve multiple functions simultaneously. The same reference signals are used for both CLI measurement and for channel estimation purposes. This multi-functionality reduces the need for separate dedicated measurement signals, thereby minimizing additional signaling overhead while maintaining precise CLI measurement capabilities. The reference signals are efficiently utilized across different operational contexts.
Data Source
AI summary
A method by which a first base station removes remote cross-link interference (CLI) can comprise: detecting the occurrence of a remote CLI; broadcasting a first reference signal including information on the first base station, on the basis of the detection of the occurrence of the remote CLI; obtaining information on a second base station; and determining that the remote CLI occurs, based on the information on the second base station. The first base station broadcasts the first reference signal, and the second base station, having received the first reference signal, can determine whether the occurrence of the remote CLI of the first base station is caused, based on the first reference signal.