How did the time companion find out?

Comprehensive use of big data and various information resources to find time and space companions and accurately track the trajectory of confirmed cases.

Time-space companion refers to a time-space companion whose phone number and confirmation number stay together for more than 10 minute in the same time-space grid (the range is 800M*800M), and the cumulative stay time of any number in the last 14 days exceeds 30 hours. My green health code will turn into a yellow code with warning nature, and will be marked as "time companion" by the system.

In other words, if the infected person has been to a place within 14 days, and your 14-day trajectory has crossed with him, whether it is a physical brush or a drift in communication signals, it may be considered as a "time-space companion". In addition, in some areas, the definition of time-space companion has not been clearly put forward, but it has been implemented in actual management.

If you are a health code yellow code person and a time-space risk person, you should report to the community immediately after receiving the SMS reminder from Chengdu Public Security Bureau and Municipal Center for Disease Control and Prevention, and conduct two nucleic acid tests within three days, with the interval between the two nucleic acid tests exceeding 24 hours. Please stay at home and do not go out until you get a negative nucleic acid result.

The above contents refer to Baidu Encyclopedia-Time Companion.