Interference Cancellation for Non-Time Aligned Symbols
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Solution Overview
Problem
In heterogeneous wireless communication networks, existing interference cancellation methods are inadequate for scenarios where macro and pico cells use different cyclic prefix lengths, leading to incomplete information removal and interference challenges due to non-time aligned symbols.
Innovation Solution
A method employing two distinct interference cancellation techniques: one for time-aligned symbols and another for non-time aligned symbols, utilizing discrete Fourier transforms and channel estimation to effectively remove interfering signals from both types of symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single interference cancellation method is used for all symbols, then the device complexity is reduced, but the interference cancellation effectiveness deteriorates when macro and pico cells use different cyclic prefix lengths
Solution Approach 1:
The patent segments the interference cancellation process into two distinct methods: a first IC method for time-aligned symbols and a second IC method for non-time aligned symbols. This segmentation allows each method to be optimized for its specific symbol type, improving overall cancellation effectiveness while managing device complexity through specialized handling of different interference scenarios
Solution Approach 2:
The patent implements dynamic selection of interference cancellation methods based on the timing alignment characteristics of received symbols. The wireless device adapts its interference cancellation approach in real-time, switching between the first IC method and second IC method depending on whether symbols are time-aligned or non-time aligned, thereby optimizing performance across varying network conditions
2Adaptability or versatility
If different cyclic prefix lengths are used in macro and pico cells to optimize各自的 performance, then the network adaptability is improved, but the interference cancellation difficulty increases due to non-time aligned symbols
Solution Approach 1:
The patent applies local quality by treating time-aligned and non-time aligned symbols differently through specialized IC methods. The first IC method handles time-aligned symbols with standard processing, while the second IC method specifically addresses non-time aligned symbols arising from different cyclic prefix lengths, allowing each symbol type to be processed with appropriate quality optimization
Solution Approach 2:
The patent changes the processing parameters of interference cancellation based on the cyclic prefix length configuration. When different cyclic prefix lengths are detected between macro and pico cells, the system transitions from standard time-aligned processing to non-time aligned processing with adjusted timing parameters, enabling effective interference cancellation across diverse network configurations
Data Source
AI summary
The present application relates to a method of a wireless device for interference cancellation (IC) in a cellular radio network system comprising a serving network node serving said wireless device. The method comprises using a first IC method for at least partly removing a time aligned symbol of an interfering radio signal from at least a first symbol of a time slot received from the serving network node. The method also comprises using a second IC method, different from the first IC method, for at least partly removing a non-time aligned symbol of an interfering radio signal from at least a second symbol of said time slot received from the serving network node.