The data for the outbreak big data push comes from the three major carriers' data. Big data analytics refers to big data analytics from the three major carriers, based on which cities or areas of which cities an individual user's cell phone has interacted with signaling and data on a base station.

Epidemic prevention big data analysis

Big data analysis is basically accurate, but there will be some degree of expansion. Carriers have accurate latitude and longitude for their base stations, and if an area of a city is determined to be a "medium-high risk" area, the government will ask carriers to provide information on users who have been there at a certain time, and give them appropriate alerts.

Operators' insiders usually define the base stations (cells) in the high-risk areas by checking them on a map, and then filtering for cell phone numbers that have interacted with those base stations (cells) at a certain time.

In order to ensure that no users are missed, the range of the box is larger than the actual medium-high risk area, because the coverage distance of some base stations is relatively far, and some base stations may cover 2-3 kilometers in the urban area if the antenna tilt angle is not reasonable.