Spatial Interference Alignment for Multi-Cell Full Duplex Networks
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Solution Overview
Problem
Full duplex wireless communication systems face challenges in scaling due to uplink downlink interference (UDI) in multi-cell networks, which limits the multiplexing gain and is difficult to address with existing interference alignment techniques that require self-interference cancellation and channel state information sharing.
Innovation Solution
The method employs spatial interference alignment to minimize intra-cell and inter-cell interference by selecting clients for uplink and downlink data streams and using precoding and receive filters to align interfering data streams, allowing for scalable multiplexing gain in multi-cell full duplex networks without requiring extensive self-interference cancellation at client devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spatial interference alignment is used to minimize intra-cell and inter-cell interference, then the multiplexing gain becomes scalable in multi-cell full duplex networks, but the system complexity increases due to the need for client selection and interference alignment processing
Solution Approach 1:
The patent segments the client devices into uplink clients and downlink clients, and further divides the interference alignment process into separate stages: client selection, interference alignment computation, and signal processing. This segmentation allows the complex interference alignment problem to be broken down into manageable components that can be processed independently and combined to achieve scalable multiplexing gain while controlling system complexity
Solution Approach 2:
The patent introduces an intermediary interference alignment processor that computes the alignment transformations and coordinates the interference cancellation across multiple cells. This intermediary component centralizes the complex calculations and distributes the execution across uplink and downlink clients, enabling scalable multiplexing gain while managing system complexity through centralized coordination
2Reliability
If existing interference alignment techniques are used, then uplink downlink interference can be addressed, but they require extensive self-interference cancellation and channel state information sharing which are not practical for full duplex capability
Solution Approach 1:
The patent extracts the interference alignment function from the traditional self-interference cancellation framework. Instead of requiring each client to perform extensive self-interference cancellation, the system extracts the alignment computation to a centralized intermediary that coordinates interference cancellation across multiple cells, significantly reducing the self-interference cancellation burden on individual client devices while maintaining reliable interference management
Solution Approach 2:
The patent creates a universal interference alignment framework that serves multiple functions: it handles both intra-cell and inter-cell interference, supports both uplink and downlink transmissions, and operates across multiple cells simultaneously. This multi-functional approach eliminates the need for separate self-interference cancellation mechanisms at each client, reducing overall system complexity while maintaining reliable interference cancellation capability
Data Source
AI summary
A method, system, and computer program product for minimizing intra-cell and inter-cell interference in a multi-cell full duplex communication system in a wireless network. The method includes selecting, by a client selector, a plurality of clients, wherein the plurality of clients includes a plurality of uplink clients configured to transmit signals and a plurality of downlink clients configured to receive signals over a plurality of data streams in each cell of the multi-cell full duplex communication system, and performing, by a spatial interference aligner, spatial interference alignment on interfering data streams to align the interfering data streams of uplink clients towards downlink clients in its own cell and downlink clients in a neighboring cell.