DMRS-Based Interference Cancellation in Wireless Terminals
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Solution Overview
Problem
In wireless communication systems, particularly in 3GPP LTE and LTE-Advanced, increasing cell congestion leads to enhanced interference from neighboring cells, especially in heterogeneous networks, necessitating an efficient interference cancellation method to improve data reception performance.
Innovation Solution
A method and apparatus for a user equipment (UE) to receive data by detecting DeModulation Reference Signal (DMRS)-based transmission parameters of interfering cells, estimating interference channels, generating interference signals, and reconstructing data by removing these signals from the transmission signal, utilizing techniques like Blind Detection and Successive Linear Interference Cancellation (SLIC) to enhance data demodulation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interference cancellation is not performed, then device complexity remains low, but data demodulation performance deteriorates in congested cellular environments
Solution Approach 1:
The patent applies preliminary action by detecting DMRS-based transmission parameters of interfering cells before generating interference signals. The UE identifies cell IDs, antenna ports, and scrambling identifiers in advance, then uses these parameters to construct interference signals that are subsequently subtracted from the received signal, improving demodulation performance while managing complexity through structured preprocessing
Solution Approach 2:
The patent uses copying by creating a replica of the interference signal based on detected transmission parameters. The UE generates a copy of the interfering cell's DMRS and data signal using identified parameters (cell ID, antenna port, scrambling ID), then subtracts this copied interference signal from the received composite signal, effectively canceling interference without requiring direct access to the interfering transmitter
2Reliability
If multiple interference signals are canceled simultaneously, then data reception quality improves, but processing time increases
Solution Approach 1:
The patent applies segmentation by dividing the interference cancellation process into distinct stages: first detecting DMRS parameters of interfering cells, then estimating interference channels, next generating interference signals, and finally subtracting these signals from the received signal. This segmented approach allows the UE to handle multiple interference sources systematically, improving reception quality while managing processing time through structured sequential operations
Solution Approach 2:
The patent uses preliminary action by detecting and storing transmission parameters of multiple interfering cells before the actual interference cancellation operation. The UE identifies cell IDs, antenna ports, and scrambling identifiers in advance, preparing all necessary information beforehand so that the actual signal subtraction can be performed efficiently without excessive processing delays
Data Source
AI summary
The present specification provides a method for receiving data through interference cancellation. The method can comprise the steps of: receiving a transmission signal transmitted by a DMRS-based transmission method; detecting, from the transmission signal, a DMRS-based transmission parameter for an interference cell having caused interference in the transmission signal; estimating an interference channel for the interference cell on the basis of the detected DMRS-based transmission parameter; generating an interference signal for the interference cell on the basis of the estimated interference channel; and cancelling the generated interference signal from the transmission signal so as to restore data transmitted by a serving cell.