User Equipment Self-Interference Removal via Dual RF Chain Segmentation
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Solution Overview
Problem
Device-to-device (D2D) communication in LTE systems causes interference with existing cellular communication, particularly due to self-interference issues when user equipment (UE) simultaneously performs uplink/downlink transmissions with base stations and D2D communications, which existing technologies struggle to mitigate effectively.
Innovation Solution
The implementation of a user equipment (UE) with a dual RF chain architecture, including a duplexer, directional coupler, self-interference removing filter, and accumulator, to separate and process cellular and D2D signals, thereby reducing self-interference and enhancing signal reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If user equipment simultaneously performs uplink/downlink transmissions with base stations and D2D communications, then communication versatility and productivity are improved, but self-interference and harmful emissions increase
Solution Approach 1:
The patent divides the reception signal processing into two separate RF chains: a first RF chain for processing cellular reception signals and a second RF chain for processing D2D reception signals. This segmentation allows simultaneous operation of both communication modes while preventing self-interference between them, as each chain processes signals independently without mutual interference.
Solution Approach 2:
The patent introduces a duplexer as an intermediary component that separates the transmission and reception signal paths. The duplexer directs the first reception signal to the first RF chain and the second reception signal to the second RF chain, acting as a mediator that prevents direct interference between the simultaneous transmission and reception operations.
2Reliability
If dual RF chain architecture with duplexer and directional coupler is implemented, then self-interference is reduced and signal reliability is improved, but device complexity increases
Solution Approach 1:
The patent employs separate first and second RF chains for processing cellular and D2D signals respectively. This segmentation isolates the signal paths, ensuring that simultaneous transmission and reception operations do not interfere with each other, thereby improving signal reliability while managing complexity through functional separation.
Solution Approach 2:
The duplexer serves as an intermediary component that manages the separation between transmission and reception paths. By introducing this mediator, the system achieves reliable simultaneous operation of transmit and receive functions without requiring overly complex signal routing, balancing reliability improvement with acceptable device complexity.
Data Source
AI summary
With increasing user requirements for social networking services (SNS), communication between user equipments (UEs) at a physically close distance, i.e., device to device (D2D) communication, is needed. D2D communication is performed on the basis of the discovery between UEs. However, D2D communication between UEs may cause interference to communication with an existing system, i.e., a base station. Thus, one aspect of the present invention provides a user equipment comprising a transceiver capable of removing self-interference.