Interference Cancellation on Secondary Carriers in Carrier Aggregation
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Solution Overview
Problem
Wireless telecommunications networks face increased radio link interference due to network densification, which traditional air interface optimization techniques cannot effectively mitigate, especially when user devices operate on multiple carriers.
Innovation Solution
Implementing network-assisted interference cancellation techniques that utilize carrier aggregation, where the serving base station provides information to user devices about interfering neighboring base stations, allowing the devices to perform interference cancellation across multiple carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If network densification is implemented to increase mobile data capacity, then network throughput and data demand are improved, but radio link interference on uplink and downlink interfaces increases
Solution Approach 1:
The patent converts harmful interference signals into beneficial information by using cell-specific reference signals from neighboring cells to calculate and cancel interference. The interference that was previously detrimental is now utilized to improve signal quality through cancellation techniques, allowing network densification to proceed without proportionally increasing interference impact.
Solution Approach 2:
The patent introduces reference signals as intermediary elements that mediate between the desired signal and interfering signals. These reference signals serve as a foundation for calculating interference characteristics and enabling cancellation, acting as a bridge that allows the system to distinguish and eliminate interference while preserving useful signals.
2Object-affected harmful factors
If traditional air interface optimization techniques are used to mitigate interference, then some interference reduction is achieved, but effectiveness reaches practical limits and cannot sufficiently handle interference in dense networks
Solution Approach 1:
The patent changes the fundamental parameter of interference handling by transitioning from passive optimization techniques to active cancellation techniques. By using reference signals to calculate and subtract interference components, the system fundamentally alters how interference is managed, moving beyond traditional optimization limits to achieve superior interference mitigation in dense network environments.
3Productivity
If carrier aggregation is implemented to improve throughput, then data rate and connectivity are enhanced, but interference from multiple carriers accumulates and reduces system performance
Solution Approach 1:
The patent applies segmentation by treating interference cancellation separately for each carrier in the carrier aggregation. By calculating and canceling interference on individual carriers using their specific reference signals, the system manages multi-carrier interference in discrete segments rather than as a unified problem, allowing effective throughput enhancement without accumulated interference degradation.
Data Source
AI summary
Techniques described herein may allow for information, regarding neighboring cells, to be used in interference cancellation techniques in a carrier aggregation environment. A serving base station (or cell) may provide information, regarding neighboring cells that operate at a primary component carrier and one or more secondary component carriers, to a user device that employs carrier aggregation. The user device may use the information, regarding the neighboring cells, to filter interference, caused by the neighboring cells, at the primary component carrier and the secondary component carrier(s).