Mobile Communication Method Frequency Interference Control
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Solution Overview
Problem
In mobile communication systems, general cells cannot identify and mitigate interference from general mobile terminals to specific cells, leading to interference issues despite interference reports being transmitted.
Innovation Solution
The general base station instructs general mobile terminals in a specific annular area to perform handovers to different frequencies, and stores geographical positions to manage interference by excluding frequencies used in specific cells from candidates, thereby minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the general cell allows general mobile terminals to operate on the same frequency as the specific cell, then frequency resources are efficiently utilized, but interference occurs in the specific cell
Solution Approach 1:
The patent applies local quality by differentiating frequency allocation based on terminal location. Terminals in the annular area (at distances LMIN to LMAX from the general base station) are instructed to use a first frequency for uplink transmission, while other terminals use a second frequency. This location-based frequency differentiation eliminates interference in the specific cell while maintaining efficient frequency resource utilization in other areas.
2Object-affected harmful factors
If the general cell instructs all mobile terminals to perform handover to a different frequency, then interference in the specific cell is eliminated, but system complexity and handover overhead increase
Solution Approach 1:
The patent reduces system complexity by applying frequency differentiation only locally to terminals in the annular area rather than globally to all terminals. The general base station identifies terminals in the annular area based on their distance (LMIN to LMAX) and instructs only those terminals to perform handover to the first frequency. This targeted approach eliminates interference while minimizing handover overhead and maintaining simple frequency allocation for other terminals.
3Object-affected harmful factors
If the general base station identifies interfering terminals by monitoring all terminal positions, then precise interference control is achieved, but measurement and detection difficulty increases
Solution Approach 1:
The patent applies preliminary action by pre-defining the annular area boundaries (LMIN and LMAX distances) before interference occurs. The general base station uses these pre-established geometric boundaries to quickly determine which terminals are in the interference zone, rather than continuously monitoring and calculating precise positions. This approach achieves precise interference control while significantly reducing the complexity of real-time position measurement and detection.
Data Source
AI summary
A mobile communication method is applied to a mobile communication system including a general base station and a specific base station. A distance between an edge closest to the general base station among edges of a coverage area of the specific cell and the general base station is a distance LMIN. A distance between an edge most distant from the general base station among the edges of the coverage area of the specific cell and the general base station is a distance LMAX. The mobile communication method comprises: a step A of instructing, by the general base station, a general mobile terminal, located in a belt-like annular area indicating a range from the distance LMIN to the distance LMAX in a connected state in the general cell, to perform handover to a frequency different from a frequency used in the specific cell.