Network Control Terminal Interference Mitigation via CSI RS Measurement
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Solution Overview
Problem
In 3D-MIMO wireless communications, traditional beam-forming in the horizontal dimension causes inter-cell interference due to a constant down tilt angle, affecting users in high-rise buildings and adjacent cells, leading to reduced quality of service and communication efficiency.
Innovation Solution
An electronic apparatus and method for a network control terminal and network node that measure the receiving power of CSI RS ports to determine interference status, allowing for the identification of interfering beams and subsequent mitigation strategies, such as switching to non-precoded CSI RS or time-division multiplexing, to reduce interferences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam-forming in vertical dimension is used to serve users in high-rise buildings, then QoS for high-rise users is improved, but inter-cell interference to adjacent cells increases
Solution Approach 1:
The network control terminal performs preliminary actions by determining which CSI RS ports from adjacent terminals may cause interference before actual measurement occurs. This is achieved by obtaining first indication information from adjacent terminals about their CSI RS port configurations and potential interference directions, allowing the system to proactively identify and prepare for interference scenarios rather than reacting after interference occurs
Solution Approach 2:
The system implements feedback mechanisms where network nodes measure RSRP of CSI RS ports and report measurement results back to the network control terminal. The terminal then generates second indication information about actual interference based on these measurements and feeds it back to adjacent terminals. This closed-loop feedback enables dynamic adjustment of beamforming strategies to mitigate interference while maintaining service quality
2Area of stationary object
If traditional horizontal beam-forming with constant down tilt angle is used, then coverage of edge users in adjacent cells is improved, but interference to those edge users increases
Solution Approach 1:
The system applies local quality by differentiating interference assessment for different spatial locations. Instead of treating all CSI RS ports uniformly, the network control terminal identifies specific CSI RS ports that point in directions likely to interfere with edge users in adjacent cells. The measurement and reporting mechanisms are localized to only those ports and directions where interference is actually occurring, rather than applying blanket coverage or interference mitigation across all directions
Solution Approach 2:
The system transitions from static constant down tilt angles to dynamic beamforming adjustments. The network control terminal dynamically determines which CSI RS ports to measure based on real-time interference conditions and measurement results. Beamforming parameters are adjusted dynamically based on feedback about actual interference levels, allowing the system to adapt coverage patterns and interference mitigation strategies to changing spatial conditions
Data Source
AI summary
Provided in the disclosure are an electronic device and method for a network control terminal, and an electronic device and method for a network node. The electronic device and method for a network control terminal comprise: a processing circuit configured to determine, based on first indication information from an adjacent network control terminal, that a network node served by the present network control terminal measures a channel state information reference signal (CSI RS) port of reference signal receiving power (RSRP) of same, wherein the first indication information indicates an interference state of the CSI RS port used by the corresponding adjacent network control terminal; and determine, based on a measurement result from the network node, the adjacent network control terminal interfering with the network node, and the CSI RS port thereof.