Interference Cancellation for Neighboring Cell Signals
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Solution Overview
Problem
In next-generation mobile communication systems, the increased presence of small cells within macro cell coverage leads to heightened inter-cell interference, which existing technologies, such as 3GPP LTE, struggle to effectively mitigate.
Innovation Solution
An interference cancellation reception method that identifies and cancels interference from neighboring cells by detecting Cell-specific Reference Signals (CRS) and DeModulation Reference Signals (DMRS), and performs blind detection to distinguish between different data channels, allowing only the serving cell's signal to be received.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If small cells are deployed within macro cell coverage to increase network capacity, then network coverage and capacity are improved, but inter-cell interference increases
Solution Approach 1:
The patent converts the harmful interference from neighboring cells into a beneficial signal by detecting and identifying the interference source through reference signals (CRS and DMRS), then using this identified information to perform targeted interference cancellation. The interference that was previously harmful is now utilized as a means to identify and remove it, improving the SINR of the serving cell signal.
Solution Approach 2:
The patent introduces reference signals (CRS and DMRS) as intermediary elements that facilitate the identification and cancellation of interference. These reference signals serve as mediators between the receiver and the interfering signals, enabling the system to detect, classify, and cancel interference from different cells without directly processing the harmful interference itself.
2Reliability
If interference cancellation processing is performed to remove neighboring cell signals, then SINR of serving cell signal is improved, but device complexity increases
Solution Approach 1:
The patent segments the interference cancellation process into distinct stages: first detecting CRS-based interference, then detecting DMRS-based interference, and finally performing cancellation. This segmentation allows the system to handle different types of interference separately using appropriate detection methods, reducing overall processing complexity compared to a unified approach.
Solution Approach 2:
The patent performs preliminary detection and identification of interference signals using reference signals (CRS and DMRS) before the actual data reception and processing. By identifying the presence and characteristics of interfering signals in advance through blind detection and parameter estimation, the system prepares for more efficient interference cancellation during the main data processing stage.
3Measurement precision
If blind detection of DMRS parameters is performed to identify data channels, then interference cancellation accuracy is improved, but detection time and complexity increase
Solution Approach 1:
The patent performs blind detection of only the necessary DMRS parameters (such as cell ID, scrambling ID, antenna port number, and SNR) required for interference cancellation, rather than detecting all possible channel parameters. This partial detection approach achieves sufficient accuracy for interference cancellation while reducing the time and computational complexity compared to full channel parameter detection.
Data Source
AI summary
One disclosure of the present specification provides an interference cancellation reception method. The interference cancellation reception method can comprise the steps of: cancelling an interference caused by a cell-specific reference signal (CRS) from a neighboring cell which is mixed within a signal received from a serving cell; blind-detecting a parameter related to a demodulation reference signal (DMRS) so as to discover whether the signal from the neighboring cell mixed within the received signal is a data channel modulated on the basis of the DMRS; cancelling an interference between the detected DMRS signal and a DMRS signal of the serving cell when the DMRS is detected on the basis of the DMRS-related parameter; blind-detecting a modulation order for the data channel from the neighboring cell; and receiving only the signal from the serving cell through the interference cancellation by the data channel from the neighboring cell on the basis of the modulation order.