Mobile Terminal Interference Cancellation via Forwarded Scheduling
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Solution Overview
Problem
Cellular communication networks face challenges in efficiently mitigating co-channel interference in downlink signal communication, which reduces signal quality and limits capacity, despite techniques like Coordinated Multi-Point Transmission and Reception (CoMP) and collaborative MIMO, due to increased bandwidth requirements and limited freedom in coordinated scheduling.
Innovation Solution
A method where a serving access node obtains and forwards scheduling information to a mobile terminal to enable interference mitigation, allowing the terminal to remove interfering signal portions from received communication signals, utilizing techniques like interference cancellation or rejection combining based on the received scheduling information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If joint transmission is used for interference mitigation, then signal quality is improved, but bandwidth consumption increases significantly
Solution Approach 1:
The patent extracts and removes the interfering signal component from the received composite signal using interference cancellation techniques. By identifying and subtracting the interfering signal based on scheduling information, the system improves signal quality without requiring additional bandwidth for joint transmission.
Solution Approach 2:
The patent introduces scheduling information as an intermediary element that enables the mobile terminal to identify and mitigate interfering signals. This scheduling information acts as a mediator that allows interference cancellation without requiring direct coordination or additional bandwidth between access nodes.
2Reliability
If coordinated scheduling is used for interference mitigation, then signal quality is improved, but scheduling flexibility decreases
Solution Approach 1:
The patent enables the mobile terminal to perform self-service interference mitigation by providing it with scheduling information about interfering signals. The terminal independently identifies and cancels interfering signals without requiring continuous coordination or restrictions on access node scheduling decisions, thus maintaining scheduling flexibility while improving signal quality.
Solution Approach 2:
The system uses scheduling information as feedback to the mobile terminal, enabling the terminal to adaptively mitigate interference based on known scheduling decisions. This feedback mechanism allows interference cancellation without constraining the scheduling freedom of access nodes.
3Reliability
If interference cancellation is performed at the mobile terminal, then signal quality is improved, but processing complexity increases
Solution Approach 1:
The patent applies preliminary action by providing the mobile terminal with scheduling information about interfering signals before the terminal performs interference cancellation. This advance information allows the terminal to efficiently identify and remove interfering components without requiring complex real-time analysis, thereby reducing processing complexity while maintaining signal quality improvement.
Data Source
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AI summary
In downlink signal communication to a mobile terminal (200), the mobile terminal (200) is associated with a serving access node (100-1). Signal communication to a further mobile terminal (200'; 200'") may interfere with the signal communication between the serving access node (100-1) and the mobile terminal (200). In order to allow interference mitigation at the mobile terminal (200), the serving access node (100-1) obtains scheduling information pertaining to the signal communication to the further mobile terminal (200'; 200'"). The obtained scheduling information is then forwarded to the mobile terminal (200) to be used for interference mitigation.