Neighbor Beam Interference Measurement in 5G NR
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Solution Overview
Problem
Current enhanced inter-cell interference coordination (eICIC) methods are insufficient in resolving neighbor interference in 5G New Radio (NR) deployments due to finer beamforming with a larger number of antennas, leading to stronger interference from neighbor base stations transmitting synchronization signals and reference signals with high Reference Signal Received Power (RSRP.
Innovation Solution
A user equipment (UE) measures the signal strength of reference signals from neighbor base stations in different beams, identifies strongly interfering beams, and reports them to the serving base station, which configures the reference signals and coordinates with neighbor base stations to reduce interference by adjusting transmission parameters such as power, precoding, or resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If neighbor base stations transmit reference signals with high RSRP to improve signal quality, then reference signal strength is improved, but neighbor cell interference increases
Solution Approach 1:
The patent applies local quality by configuring different transmission powers for different reference signals from neighbor base stations. Specifically, the serving base station configures the UE to measure reference signals from multiple neighbor base stations, identifies which ones cause strong interference, and then coordinates with those specific neighbor base stations to reduce their reference signal transmission power. This targeted approach reduces interference locally at affected UEs while maintaining adequate reference signal strength for other UEs that do not experience interference.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the transmission power parameter of reference signals from neighbor base stations. The serving base station modifies the RSRP parameter of specific reference signals that are identified as causing strong interference, transforming them from high-power to reduced-power transmissions. This parameter adjustment resolves the contradiction by changing the power level from a fixed high value to a variable value that adapts to interference conditions.
2Reliability
If eICIC methods are used to reduce neighbor interference, then interference coordination is improved, but they are insufficient for 5G NR beamforming scenarios
Solution Approach 1:
The patent applies dynamics by transitioning from static interference coordination to dynamic beam-specific interference management. The system continuously measures reference signals from multiple neighbor base stations using beamforming, dynamically identifies which beams cause strong interference, and adaptively adjusts transmission parameters in real-time. This dynamic approach enables eICIC to effectively adapt to 5G NR beamforming scenarios where interference patterns change with beam direction and UE position.
Solution Approach 2:
The patent implements segmentation by dividing the interference coordination problem into beam-specific segments. Instead of treating all reference signals uniformly, the system measures and evaluates each reference signal from different neighbor base stations and different beams separately. This segmentation allows targeted interference reduction for specific beams that cause problems while maintaining other beams that do not cause interference, making eICIC applicable to the complex beamforming environment of 5G NR.
Data Source
AI summary
Aspects are provided which resolve neighbor beam-wise interference. A UE obtains a plurality of reference signals from each of at least one neighbor base station, where each of the reference signals is obtained in a different beam, and each of the neighbor base station(s) is in a different neighbor cell. The UE then measures a signal strength associated with each of the reference signals, and the UE indicates one or more of the reference signals to a serving base station in a serving cell, where the signal strength of each of the reference signal(s) indicated to the serving base station exceeds a threshold RSRP. After the serving base station obtains the indication from the UE, the serving base station coordinates with the neighbor base station(s) to modify one or more transmission parameters in response to the indication.