Interference Cancellation via Network-Assisted Configuration
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Solution Overview
Problem
In LTE mobile communication networks, interference from neighboring cells can be dynamic and challenging to cancel due to scheduling behaviors and changing resource allocations, making reliable interference cancellation complex and unreliable, especially for blind-detection receivers.
Innovation Solution
User Equipment (UE) obtains configuration information about neighboring cell data transmissions, determines the location of data resource elements, and estimates the interference channel to cancel the interference based on received radio signals, reducing the complexity of detecting interference characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blind-detection methods are used to detect interference characteristics, then interference cancellation can be performed without network assistance, but the complexity and unreliability of the receiver increases significantly
Solution Approach 1:
The patent introduces network-side assistance as an intermediary to provide interference configuration information to the UE. This mediator supplies critical parameters (resource allocation, modulation order, coding scheme) that the UE would otherwise need to detect blindly, thereby reducing receiver complexity while maintaining cancellation reliability
Solution Approach 2:
The network performs preliminary detection and characterization of interference signals before the UE receives them. The eNB provides pre-processed interference configuration information that includes already-detected parameters, allowing the UE to skip complex blind detection steps and directly perform cancellation with higher reliability
2Measurement precision
If complete interference characteristics are detected blindly by the receiver, then interference cancellation can be performed autonomously, but the detection accuracy decreases due to dynamic scheduling changes
Solution Approach 1:
The patent implements a feedback mechanism where the network continuously provides updated interference configuration information to the UE. This feedback loop ensures that the UE has access to current and accurate interference parameters even when scheduling changes occur dynamically, maintaining detection accuracy without requiring the UE to adapt to every change autonomously
Solution Approach 2:
The network acts as an intermediary that monitors and tracks dynamic scheduling changes in real-time, then communicates these changes to the UE. This mediator approach allows the system to adapt to dynamic conditions while keeping the UE's detection task simplified and accurate
3Reliability
If more transmission parameters of interference are obtained, then interference cancellation performance improves, but the complexity of obtaining these parameters increases
Solution Approach 1:
The network serves as an intermediary that collects and provides multiple interference parameters (resource allocation, modulation order, coding scheme, resource elements) to the UE in a standardized format. This eliminates the need for the UE to detect each parameter independently, achieving high cancellation performance while keeping the UE's complexity manageable
Solution Approach 2:
The patent creates a universal interference configuration information structure that can convey multiple different parameters in a unified manner. This multi-functional information structure allows the UE to obtain all necessary parameters through a single standardized interface, improving cancellation performance without proportionally increasing complexity
Data Source
AI summary
A method of interference cancellation is proposed. A UE obtains configuration information of a data transmission from a neighboring cell via an interference channel in a mobile communication network. The UE receives radio signals on a set of data resource elements as determined based on the obtained configuration information. The UE then estimates the interference channel corresponding to the data transmission from the neighboring cell based on the received radio signals on the set of data resource elements. Finally, the UE cancels the data transmission from the neighboring cell based on the estimated interference channel.