Extended information:
The Communications Big Data Trip Card is a free query service provided by the China Academy of Information and Communications Technology (AICT) in conjunction with three basic telecom companies, China Telecom, China Mobile and China Unicom, for Chinese cell phone users using communications big data, which allows cell phone users to query information about all the cities and municipalities they have visited in the previous 14 days.
As of March 25, 2020, the cumulative number of queries has exceeded 450 million.
Starting at 20:30 on January 8, 2021, the trip card will no longer mark the names of cities and towns containing medium- and high-risk areas in red, and will change to include the medium- and high-risk areas in the parentheses after the city name, with the note serving only as a travel reminder and not associated with health status.
March 30, 2021, the national government service platform "epidemic prevention health code" has integrated "communication big data trip card" related information, can be displayed in the health code users, whether they have been to medium and high risk areas and other trip information, help! The health code "one code passes".
The "communication big data itinerary card" analyzes the "cell phone signaling data", which is obtained through the location of the base station where the user's cell phone is located, and the collection, transmission and processing of signaling data are automated, with strict security and privacy safeguard mechanisms, and the query results are available in real time, convenient and fast. The query results are available in real time, convenient and quick. The data of "Communication Big Data Trip Card" can be used nationwide, truly achieving comprehensive coverage of the whole country on one network, and it can also be used to query the international trips of one's domestic cell phone number. Under the premise of ensuring user information security, these will provide scientific and accurate technical support for epidemic prevention and control, resumption of work and production, road traffic, immigration and other aspects.
The data source of the location query service provided by the travel card is "cell phone signaling data", which is obtained through the location of the base station where the user's cell phone is located. In order to ensure continuous communication, realize coverage without blind spots, and provide better communication service quality, the signals of two base stations at the border of administrative districts may be cross-covered, resulting in deviation of the results. This is possible if the user lives close to the city boundary, or if he/she drives long distances or takes the train.
The health code is based on real data, and can be generated by citizens or people returning to work through their own online declaration, which can be reviewed and approved by the back office to generate a two-dimensional code belonging to an individual.
The two-dimensional code serves as an electronic credential for individuals to pass in and out of the local area, realizing one-time declaration and universal use across the city. The launch of the health code is aimed at making the resumption of work and production more accurate, scientific and orderly.