Network Controller PCI Collision Prediction for Moving Cells
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Solution Overview
Problem
In wireless communications, the reuse of physical cell identifiers (PCIs) can lead to collisions between cells due to the movement of a cell, causing synchronization signal interference and failure in network connection, especially in scenarios with a high number of moving cells.
Innovation Solution
A network controller generates an Nth neighbor cell list to predict potential PCI collisions and requests a moving cell to change its PCI when interference is likely, using unique ECGI information to differentiate between cells and prevent collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If PCI reuse is implemented to support high density cells, then network coverage and capacity are improved, but PCI collision and synchronization signal interference occur
Solution Approach 1:
The system performs preliminary actions by proactively detecting moving cells and predicting potential PCI collisions before they occur. The network controller monitors cell movements and preemptively changes PCIs of moving cells to avoid synchronization signal interference, thereby maintaining reliable communication in high-density networks without requiring PCI reuse.
Solution Approach 2:
The invention dynamically changes the PCI parameter of moving cells based on their movement status and potential interference with other cells. By adjusting the PCI parameter in real-time according to cell position and motion, the system prevents PCI collisions while maintaining the ability to support high cell density.
2Object-affected harmful factors
If PCI change is performed to prevent collision, then interference is reduced, but handover delay and connection failure occur
Solution Approach 1:
The system performs PCI change as a preliminary action before actual interference occurs. By detecting moving cells and predicting potential collisions in advance, the network controller proactively changes PCIs to prevent interference, thereby avoiding the need for reactive handovers and connection failures that would cause delays.
Solution Approach 2:
The invention implements feedback mechanisms where the network controller continuously monitors cell movement and PCI usage, adjusting PCIs based on real-time feedback about cell positions and potential collisions. This feedback loop enables proactive PCI changes that prevent interference without causing handover delays.
3Measurement precision
If ANR procedure is used to identify unknown cells, then cell identification accuracy is improved, but processing time and complexity increase
Solution Approach 1:
The system performs preliminary identification of moving cells using ECGI information before the full ANR procedure is needed. By pre-identifying moving cells and their target cells, the system reduces the processing time and complexity of the subsequent ANR procedure while maintaining high identification accuracy.
Solution Approach 2:
The invention extracts and utilizes ECGI information from measurement reports to identify moving cells, separating this preliminary identification step from the full ANR procedure. By extracting ECGI data for preliminary cell identification, the system reduces the overall processing time and complexity while maintaining accuracy.
Data Source
AI summary
Disclosed are a method and a device for determining a cell identifier. A method for determining a cell identifier can comprise the steps of: a network control unit generating an Nth neighbor cell list which comprises information about a neighboring cell of a search cell; the network control unit receiving, from a search cell, information about a global cell identifier and a first PCI of an unknown cell; the network control unit determining whether or not the unknown cell is a moving cell on the basis of the global cell identifier; and, if the unknown cell is a moving cell and the first PCI and a second PCI of a neighbor cell that is comprised in the Nth neighbor cell list, the network control unit transmitting to the moving cell a PCI change signal that requests changing of the first PCI.