PCI Assignment via Multi-Hop Relay for Collision-Free Cells
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Solution Overview
Problem
Current communication systems face challenges in maintaining collision-free and confusion-free PCI assignment as they cannot consider identifier information of adjacent cells not connected to the SON functional node, leading to difficulties in managing radio environment changes.
Innovation Solution
The system includes a configuration where a first base station transmits adjacent cell information to a second base station, which then forwards this information to an identifier assignment device, enabling the device to assign identifiers that maintain collision-free and confusion-free conditions even when the radio environment changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a SON functional node assigns PCI based on adjacent cell information from directly connected base stations only, then the assignment process is simple, but the system cannot maintain collision-free and confusion-free PCI when radio environment changes
Solution Approach 1:
The patent introduces intermediate base stations as information relays. Base stations that are not directly connected to the SON functional node can still have their adjacent cell information transmitted to the SON node through intermediate base stations. This mediator approach enables the SON node to access identifier information of adjacent cells of cells formed by base stations not directly connected, resolving the contradiction between reliability and complexity.
Solution Approach 2:
The patent extends the information transmission scope from direct connections to indirect connections through multiple hops. By allowing information to propagate through intermediate base stations, the system moves from a two-dimensional direct connection model to a three-dimensional multi-hop communication model, enabling comprehensive PCI assignment consideration.
2Measurement precision
If the system measures and manages detailed radio environment information, then PCI assignment accuracy improves, but the work required and management difficulty increase enormously
Solution Approach 1:
The patent extracts only the essential identifier information (PCI, ECGI, frequency information) of adjacent cells from the complex radio environment data. Instead of managing detailed radio environment measurements, the system focuses on transmitting and processing these key identifier elements, significantly reducing information management complexity while maintaining PCI assignment accuracy.
Solution Approach 2:
The system creates a simplified copy of the radio environment information structure, focusing only on the necessary identifier fields rather than all detailed measurement data. This selective copying approach maintains the essential information needed for PCI assignment while eliminating the burden of managing comprehensive radio environment data.
Data Source
AI summary
The communication system includes a first base station that forms a first cell, a second base station that forms a second cell, and an identifier assignment device that assigns an identifier for identifying the second cell, wherein the first base station transmits first neighbor cell information containing identifier information of neighbor cells of the first cell to the second base station, and the second base station transmits the first neighbor cell information received from the first base station to the identifier assignment device.