Reference Signal Interference Canceling for Multi-RAT Cells
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Solution Overview
Problem
Existing wireless communication systems face challenges in effectively managing interference between reference signals of different radio access technologies, particularly between New Radio (NR) and Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA), which can degrade signal quality and throughput.
Innovation Solution
Implementing interference canceling and rate matching techniques by generating a replica of the interference signal and subtracting it from resource elements, or performing de-weighting operations based on threshold measurements and associations between cells, using configurations for cell-specific reference signals and timing/power offsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If reference signals from different RATs are transmitted simultaneously, then system capacity and resource utilization are improved, but interference between reference signals increases
Solution Approach 1:
The patent applies preliminary action by performing interference cancellation operations before channel estimation and data detection. The UE identifies potential interfering reference signals from other RATs, estimates their characteristics, and subtracts them from the received signal in advance, allowing subsequent processing to proceed with reduced interference.
Solution Approach 2:
The patent converts the harmful interference from other RATs into a beneficial process by using the known structure and properties of interfering reference signals to create accurate interference replicas. These replicas are then subtracted from the received signal, transforming the harmful interference into a useful cancellation operation that improves overall signal quality.
2Measurement precision
If interference cancellation operations are performed, then signal quality is improved, but processing complexity increases
Solution Approach 1:
The patent applies local quality by performing interference cancellation only in specific resource elements where interfering reference signals are present, rather than processing the entire signal. The UE identifies the precise locations of interfering reference signals based on configured patterns and applies cancellation operations only to those specific resource elements, reducing overall processing complexity.
Solution Approach 2:
The patent segments the interference cancellation process into distinct stages: identification of interfering reference signal locations, estimation of interference characteristics, generation of interference replicas, and subtraction from received signals. This segmentation allows the UE to handle each aspect separately with optimized algorithms, reducing overall computational complexity.
3Object-affected harmful factors
If rate matching around reference signals is performed, then interference is reduced, but resource utilization efficiency decreases
Solution Approach 1:
The patent applies dynamics by making the rate matching pattern configurable and adaptable to different scenarios. The network can dynamically adjust which resource elements are excluded from data transmission based on the presence and strength of interfering reference signals, allowing the system to optimize between interference reduction and resource utilization depending on current conditions.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station, information that identifies an association between a first cell of a first radio access technology (RAT) and a second cell of a second RAT. The UE may perform a measurement for the first cell. The UE may determine that the measurement for the first cell satisfies a threshold value. The UE may perform an interference canceling operation for a reference signal of the second cell, or a de-weighting operation for one or more resource elements in which the reference signal interferes, based at least in part on the determination that the measurement for the first cell satisfies the threshold value and the association between the first cell and the second cell. Numerous other aspects are described.