Simple GSM positioning emulator

Functional description

● There are X (X <100) base stations (BS) and Y( Y < 100) mobile stations (MS).
● Base stations can detect the presence of mobile stations in a certain radius
(detectionRadiusInMeters).
● When detected, MS id and timestamp are reported by BS to RestEndpoint1 (see below)
● One MS can be reported multiple times by multiple BSs.
● Data should be saved to relational database (in-memory db is fine for this assignment)
● MS position can be queried from RestEndpoint2 (see below).
● RestEndpoint2 should be mapped to /location/{uuid} , where uuid is MS id.
● RestEndpoint2 should correctly handle errors and situations where the information is not available.

The system designed and implemented using following technologies / libraries:
● Spring Boot
● Java 8

Examples

Base station can be described with the following set of properties:

"id": uuid,
"name": string,
"x": float,
"y": float,
"detectionRadiusInMeters": float
}

Mobile station can be described with the following set of properties:

"id": uuid,
"lastKnownX": float,
"lastKnownY": float
}

RestEndpoint1 message example:

"base_station_id": uuid,
"reports": [
{"mobile_station_id": uuid, "distance": float, "timestamp": timestamp},
{"mobile_station_id": uuid, "distance": float, "timestamp": timestamp},
]
}

RestEndpoint2 response example:

"mobileId": uuid,
"x": float,
"y": float,
"error_radius": float,
"error_code": integer,
"error_description": string
}

How it works

• At the start of the application emulator downloads some fake Base Station locations from the internet and saves them
• After data downloaded users can retrieve mobile locations coordinates

Build & run

Build bsc module with maven profile no-integration-tests. Run.
bts-mesh module is not yet working.