Adaptive Interference Cancellation for Heterogeneous Wireless Networks
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Solution Overview
Problem
Wireless communication networks face interference issues due to transmissions from neighboring base stations and other RF transmitters, which degrade performance and increase as demand for mobile broadband access grows, especially in heterogeneous networks with varying cell types and power levels.
Innovation Solution
The method involves detecting interference between neighboring cells and serving cells in heterogeneous wireless networks and canceling it using an adaptive technique based on whether the interference involves colliding Common Reference Signal (CRS) tones, employing processors and memory to implement interference cancellation algorithms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If more UEs access wireless networks to meet growing demand for mobile broadband, then network capacity and user coverage are improved, but interference between neighboring cells increases and degrades performance
Solution Approach 1:
The patent converts harmful interference from neighboring cells into a manageable signal by detecting and characterizing the interference pattern, then using that same interference information to reconstruct and subtract the interfering signal, thereby transforming the harmful effect into a beneficial cancellation mechanism that improves network capacity
Solution Approach 2:
The patent introduces an intermediary interference cancellation mechanism that acts as a mediator between the transmitted signal and the received signal. This intermediary process detects interference characteristics and applies adaptive cancellation techniques to remove the harmful effects, enabling higher network capacity without proportional increase in interference
2Adaptability or versatility
If heterogeneous networks with varying cell types and power levels are deployed to meet diverse coverage requirements, then network adaptability is improved, but interference complexity increases
Solution Approach 1:
The patent applies dynamics by implementing adaptive interference cancellation that adjusts its characteristics based on real-time detection of interference patterns. The system dynamically modifies cancellation parameters and techniques according to the specific heterogeneous network conditions, cell types, and power level relationships, thereby managing interference complexity while maintaining high adaptability
Solution Approach 2:
The patent utilizes parameter changes by modifying interference cancellation parameters such as detection thresholds, cancellation weights, and processing algorithms based on the specific characteristics of different cell types and interference scenarios. This allows the system to handle the complexity of heterogeneous networks through parameter adaptation rather than complex fixed architecture
3Measurement precision
If adaptive interference cancellation techniques are applied to handle colliding CRS tones, then interference cancellation accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the interference cancellation process into distinct stages: interference detection, interference characterization, and interference cancellation. This segmentation allows each stage to be optimized independently, improving accuracy while managing processing complexity through modular implementation of the cancellation algorithm
Data Source
AI summary
A method to enhance coverage and/or throughput in a heterogeneous wireless network includes detecting interference between a neighboring cell and a serving cell. The method also includes cancelling the interference using an adaptive technique based on whether the interference has colliding Common Reference Signal (CRS) tones.