MSIM Device Cell Selection for Interference Reduction
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Solution Overview
Problem
In multi-SIM card wireless communication devices, interference between different frequency bands used by SIM cards operating in various radio access technologies (RATs) such as NR and LTE leads to desense and reduced performance, particularly during cell acquisition, handover, and cell reselection processes.
Innovation Solution
The device selects a first cell for communication in a first frequency band and identifies a subset of cells in a second frequency range that minimize interference with the first frequency band, allowing for simultaneous communication by selecting a second cell from this subset, thereby reducing desense and improving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple SIM cards operate simultaneously in different frequency bands, then service coverage and communication capability are improved, but interference between frequency bands occurs causing desense and reduced performance
Solution Approach 1:
The system performs cell selection and frequency band configuration in advance before actual communication occurs. By pre-identifying and selecting cells with frequency bands that minimize mutual interference, the system proactively prevents desense issues rather than reacting to them during operation. This preliminary cell selection process ensures that when multiple SIM cards activate simultaneously, they operate on pre-vetted non-interfering frequencies.
Solution Approach 2:
The system dynamically changes frequency band parameters by selecting from multiple available cells with different operating frequencies. When interference is detected or anticipated, the system reconfigures the frequency bands by switching to alternative cells that operate on different frequencies, thereby changing the operational parameters to eliminate harmful interference while maintaining service coverage.
2Productivity
If cell selection is performed without considering interference, then device complexity and processing time are reduced, but communication reliability and data rates deteriorate due to desense
Solution Approach 1:
The system pre-calculates and stores information about frequency band compatibility and interference characteristics of different cells during idle periods or network registration phases. This preliminary preparation allows the cell selection process to quickly reference pre-analyzed data rather than performing complex interference calculations in real-time, thus maintaining fast selection speed while ensuring reliable, interference-free communication.
Solution Approach 2:
The device autonomously performs interference assessment and cell selection without requiring external network coordination or user intervention. The system self-evaluates available cells based on stored frequency compatibility data and automatically selects the optimal non-interfering cell, thereby achieving both rapid selection and high reliability through self-directed optimization.
3Ease of operation
If frequency bands are selected without minimizing interference, then ease of operation and network compatibility are improved, but block error ratios increase due to desense during handover and cell reselection
Solution Approach 1:
The system changes the operational frequency band parameters during handover and cell reselection by selecting target cells whose frequency bands are pre-determined to be non-interfering with currently active bands. This parameter change ensures that even during dynamic network operations like handover, the device transitions to frequency bands that minimize interference, thereby reducing block error ratios while maintaining ease of network operation through automated frequency selection.
Data Source
AI summary
Aspects relate to reducing interference in multi-subscriber identity module card (MSIM) wireless communication devices. The wireless communication device may select a first cell for communication in a first frequency band of a first frequency range utilizing a first SIM card. The wireless communication device may further identify a cell subset of set of cells operating in respective second frequency bands of a second frequency range that each minimize interference with the first frequency band. The wireless communication device may then select a second cell of the cell subset for communication utilizing a second SIM card.