SON Server PCI Conflict Resolution in Mobile Networks
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Solution Overview
Problem
In mobile communication systems, the increasing use of pico base stations within macro cell ranges leads to Physical Cell Identifier (PCI) confusion, causing handover performance degradation due to the need for alternative handovers and increased air signaling overhead, which existing systems attempt to mitigate through Self Organizing Network (SON) servers but often require configuration of X2 interfaces that operators prefer to avoid.
Innovation Solution
A method where a terminal transmits macro base station information to a pico base station, which then sends a Neighbor Relation Table (NRT) to a SON server for comparison, allowing the server to detect and reallocate new PCIs to pico base stations sharing the same identifier, thereby resolving PCI confusion without requiring X2 interface configuration between macro and pico base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple pico base stations use the same PCI within a macro cell range, then device complexity is reduced and deployment is simplified, but PCI confusion occurs causing handover performance degradation
Solution Approach 1:
The SON server performs preliminary detection of PCI conflicts by comparing NRT information before handover operations. When PCI confusion is detected in advance, the server proactively reallocates PCIs to prevent handover failures, rather than reacting after problems occur.
Solution Approach 2:
The SON server acts as an intermediary between pico base stations and the network management system. It receives NRT information from pico base stations, detects PCI conflicts, and coordinates PCI reallocation without requiring direct X2 interface configuration between macro and pico base stations.
2Reliability
If alternative handover is used to resolve PCI confusion, then handover can proceed, but air signaling overhead increases and handover latency increases
Solution Approach 1:
The system performs preliminary detection and resolution of PCI conflicts through NRT comparison before handover operations. By proactively allocating unique PCIs to pico base stations, the system prevents PCI confusion from occurring, thereby avoiding the need for alternative handover procedures and reducing handover latency.
Solution Approach 2:
The SON server implements a feedback mechanism where it continuously monitors NRT information from pico base stations, detects PCI conflicts, and reallocates PCIs. This closed-loop feedback system ensures that PCI confusion is detected and resolved automatically, preventing degradation of handover performance.
3Reliability
If X2 interface configuration is implemented between macro and pico base stations to detect PCI confusion, then PCI management is improved, but device complexity and operational complexity increase
Solution Approach 1:
The SON server serves as an intermediary that enables PCI conflict detection without requiring direct X2 interface configuration between macro and pico base stations. It collects NRT information from pico base stations through existing interfaces, performs centralized comparison and detection, thereby avoiding the operational complexity of X2 interface setup while maintaining detection accuracy.
Solution Approach 2:
The system enables pico base stations to self-report their NRT information to the SON server, which then automatically performs PCI conflict detection and resolution. This self-service mechanism eliminates the need for manual X2 interface configuration and reduces operational complexity while maintaining reliable PCI management.
Data Source
AI summary
A mobile communication system and method for managing the base station identifiers is provided. The method includes transmitting macro base station information from a terminal to a first pico base station; transmitting a Neighbor Relation Table (NRT) including the macro base station information from the first pico base station to a Self Organizing Network (SON) server; determining, at the SON server, whether a second pico base station using same Physical Cell Identifier (PCI) as the first pico base station exists by comparing a previously stored NRT with the received NRT; and reallocating, at the SON server, upon determining that the second pico base station uses the same PCI as the first pico base station, new PCIs to the first and second pico base stations.