Cell ID Disambiguation via GPS Neighbor Table
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Solution Overview
Problem
In mobile networks, the reuse of physical cell identifiers (PCIs) by multiple cells can lead to ambiguity, causing confusion during handover processes, especially for mobile base stations that move and encounter changing neighbor cells, resulting in inefficiencies and increased battery consumption due to the need for frequent ECGI requests.
Innovation Solution
A method involving the construction of a neighbor table that associates physical cell identifiers (PCIs) with GPS positions and ECGIs, allowing for the disambiguation of ambiguous PCIs by using a coordinating node to infer the intended target base station based on the mobile base station's current GPS location and stored records, reducing the need for multiple ECGI requests and optimizing handover processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If PCI reuse is implemented to support more than 504 cells, then the network capacity increases, but PCI confusion occurs when the same PCI is used by multiple cells
Solution Approach 1:
The patent introduces GPS location as an additional dimension to disambiguate PCI identification. Instead of relying solely on PCI (one-dimensional identifier), the system combines PCI with GPS coordinates (two-dimensional identification space), allowing the same PCI to be uniquely identified by its geographic location. This resolves the contradiction by enabling PCI reuse across the network while maintaining reliable cell identification through spatial differentiation.
2Measurement precision
If ECGI requests are sent frequently to resolve PCI ambiguity, then accurate cell identification is achieved, but battery consumption increases
Solution Approach 1:
The system performs preliminary action by pre-acquiring and storing GPS location information in the neighbor table before handover is needed. When a handover request occurs, the system can immediately match the target cell's GPS coordinates with stored entries, eliminating the need for frequent ECGI requests. This preliminary preparation of location data resolves the contradiction by enabling accurate cell identification through pre-stored spatial information rather than repeated communication overhead.
Solution Approach 2:
The patent introduces GPS location as an intermediary element that mediates between PCI ambiguity and ECGI requests. Instead of directly requesting ECGI to resolve PCI confusion, the system uses GPS coordinates as an intermediate key to look up the target cell in the neighbor table. This intermediary approach reduces the frequency of ECGI requests while maintaining accurate cell identification, thereby reducing battery consumption.
3Measurement precision
If neighbor tables are updated frequently to track moving base stations, then handover accuracy improves, but system complexity increases
Solution Approach 1:
The system performs preliminary action by pre-populating the neighbor table with GPS locations of neighboring cells before the mobile base station moves. This advance preparation allows the system to track handovers by comparing current GPS position with pre-stored location data, simplifying the update process while maintaining high handover accuracy. The preliminary structuring of location information reduces the complexity of real-time neighbor table management.
Data Source
AI summary
Systems and methods for cell ID disambiguation are described. In one embodiment, a method may be disclosed for constructing a neighbor table, comprising: receiving, at a mobile base station, a physical cell identifier (PCI) of a detected neighbor base station from a user equipment (UE); receiving a global positioning system (GPS) position of the mobile base station; and associating the GPS position of the mobile base station with the PCI of the detected neighbor base station in a neighbor table.