Interference Suppression in Wireless Networks via Virtual Handover
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Solution Overview
Problem
In wireless communication networks, particularly in LTE systems, mobile base stations on vehicles like trains face cell ID conflicts due to geographical reuse of cell IDs, leading to interference and service disruptions when traveling through areas with the same cell ID, making it difficult to provide reliable high-data-rate services.
Innovation Solution
A controlling node in the network predicts potential cell ID conflicts using traffic information and triggers a virtual handover by broadcasting a new cell ID and adjusting reference signal powers, allowing seamless transition without interrupting user equipment connections, thus avoiding resource conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mobile base stations use geographically reused cell IDs to provide wireless service, then network resource utilization is improved, but interference and service disruption occur when traveling through areas with the same cell ID
Solution Approach 1:
The system performs preliminary detection of potential cell ID conflicts by monitoring the mobile base station's location and predicted trajectory against the database of fixed base station cell IDs. Before a conflict actually occurs, the system proactively triggers a cell ID change, preventing interference rather than reacting to it after service disruption begins.
Solution Approach 2:
The system implements continuous feedback by monitoring the mobile base station's real-time location, comparing it with the geographic distribution of fixed base stations, and dynamically adjusting the cell ID assignment. This closed-loop control ensures that cell ID conflicts are detected and resolved through automatic reassignment, maintaining service reliability while preserving resource utilization efficiency.
2Reliability
If cell ID changes are implemented to avoid interference, then service reliability is improved, but connection interruption occurs during the transition process
Solution Approach 1:
The system dynamically manages cell ID transitions by preparing the new cell ID configuration in advance and coordinating the switch timing with the mobile base station's movement state. The handover process is optimized to occur during periods of lower user activity or with minimal impact on active connections, reducing service interruption while maintaining reliability through continuous cell ID management.
Solution Approach 2:
The system introduces a controlling node as an intermediary that manages the cell ID change process. This intermediary coordinates between the mobile base station, the network management system, and user equipment, orchestrating the handover to minimize disruption. The controlling node ensures that cell ID transitions are smooth and that user connections are maintained or rapidly reestablished during the change process.
3Object-affected harmful factors
If cell ID conflict detection and resolution is implemented, then interference suppression is improved, but system complexity increases
Solution Approach 1:
The system implements self-service mechanisms where the mobile base station autonomously monitors its own cell ID usage and triggers handover requests when potential conflicts are detected. The base station maintains a database of fixed base station cell IDs and performs self-detection of conflict scenarios, reducing the need for complex centralized control while effectively suppressing interference through autonomous decision-making.
Data Source
AI summary
An interference suppression method, base station and controlling node of the base station are disclosed. In the method, the controlling node informs via a first control signal the base station which is broadcasting a first synchronization signal containing a first cell identity (ID) and a first reference signal, of broadcasting a second synchronization signal containing a second cell ID and a second reference signal. The controlling node then informs via a second control signal the base station of adjusting signal powers of the first reference signal and the second reference signal to trigger a handover from the first cell ID to the second cell ID.