Mobile Station Cell ID Differentiation in Shared Synchronization Systems
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Solution Overview
Problem
In mobile communication systems, when multiple base stations share the same cell ID, it becomes challenging for mobile stations to distinguish between neighboring cells and conflicting cells, leading to uncertainties in handover processes and potential misconnection to conflicting cells.
Innovation Solution
The mobile communication method involves acquiring conflicting cell ID information and global cell ID from the base station, which allows the mobile station to differentiate between neighboring and conflicting cells, enabling accurate handover decisions by including the global cell ID in measurement reports and handover commands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple base stations share the same cell ID, then resource utilization is improved, but mobile stations cannot distinguish between neighboring cells and conflicting cells
Solution Approach 1:
The invention segments the cell identification process into two distinct parts: cell ID (for resource allocation and basic identification) and global cell ID (for unique identification among conflicting cells). This segmentation allows multiple base stations to share the same cell ID for resource utilization while the global cell ID provides the necessary distinction for accurate cell identification and handover decisions.
2Ease of operation
If cell ID is used for handover decisions, then handover process is simplified, but mobile stations may misconnect to conflicting cells
Solution Approach 1:
The global cell ID acts as an intermediary element that bridges the simplified cell ID-based handover process with the need for accurate cell distinction. By incorporating the global cell ID into handover measurement reports and commands, the system maintains procedural simplicity while ensuring that handover decisions are made with accurate cell identification, preventing misconnection to conflicting cells.
3Measurement precision
If mobile stations measure all detected cells, then cell selection accuracy is improved, but unnecessary radio signal exchange with conflicting cells increases
Solution Approach 1:
The system performs preliminary action by providing mobile stations with conflicting cell ID information in advance through system information blocks or dedicated signaling. This allows mobile stations to pre-identify and exclude conflicting cells from measurement and handover consideration, avoiding unnecessary radio signal exchange with these cells while maintaining accurate cell selection for valid neighboring cells.
Data Source
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AI summary
A mobile communication system includes a mobile station device and a base station device. The base station device includes a cell identification information transmission unit which transmits cell identification information of base station devices transmitting radio signals of the same synchronization channel, to the mobile station device when there are at least two base station devices transmitting radio signals of the same synchronization channel within a predetermined communication area. The mobile station device includes a measurement result transmission unit which performs a measurement process based on the cell identification information of the base station devices and transmits the measurement result acquired by the measurement process to the base station device.