The article is from the public number: Fresh Date Class (ID: xzclasscom) , author: Jun jujube.
Currently, the prevention and control of domestic new coronavirus pneumonia is keyperiod.
As companies continue to resume work and work in various regions, the flow of people has begun to increase.
How to manage and control the flow of people and how to accurately identify potential contagion risks have become difficult problems for local prevention and control departments.
Xiao Zaojun received a notice from the government department a few days ago, Required to provide the 15-day mobile phone activity track of returning workers :
Although we haven’t resumed work at the moment (just remote work) , Xiao Zaojun tried it with curiosity:
During the Spring Festival, Zaojun never went anywhere
Sure enough, the query results match the actual situation.
Xiao Zaojun ’s colleagues also checked it, and the results are also accurate:
Anhui’s track is a high-speed rail city
This is really a very effective query. After all, people are not leaving their mobile phones, and the results of mobile phone tracing can prove their movement to a certain extent.
So, The question is, what is the principle of this activity track query?
Actually, this feature was not available before, at least in most parts of the country.
The reason it exists now is because the country has urgently built a national telecommunication big data comprehensive analysis platform in response to this epidemic.
Through this platform, users can query the mobile phone track and other information in a unified way.
Relevant leaders also confirmed the news at the press conference held by the Ministry of Industry and Information Technology yesterday:
Han Xia, Director of the Information and Communication Administration Bureau of the Ministry of Industry and Information Technology, said: “In the past few days, the Ministry of Industry and Information Technology has organized industry experts to conduct big data consultations, urgently set up big data analysis models of outbreak telecommunications, and organize basic telecommunication enterprise big data statistics nationwide, especially Wuhan and Hubei The movement of personnel in the region has helped the joint prevention and control departments of various regions to provide accurate strategies. “
China Telecom’s Deputy Secretary Shao Guanglu introduced that China Telecom’s big data platform has deployed nearly 10,000 nodes, and the data has been aggregated in minutes and unified computing. China Mobile and China Unicom have stated that the unified collection and analysis of data can promptly respond to various epidemic prevention and control analysis needs.
Because the epidemic is urgent, the speed of construction of this platform is requiredVery high: a notice will be issued at the end of January, requiring that joint debugging and testing begin on February 10. Prior to the 15th, the ministerial-level platform had basic data analysis, summary and display capabilities, and initially had the ability to track and show results of key personnel roaming paths. Prior to the 21st, key provinces had basic functions of information collection and analysis. By the end of February, gradually access to all provincial platforms.
So, How does this big data platform query mobile phone track?
In fact, for mobile communication systems, there are many ways to query the user’s current location information. When a mobile phone user turns on and accesses the network, the network will know the LAC where the user is located. (location area code) and cell number (Cell ID) .
The LAC and CID information found by the mobile phone will also be obtained on the network side
However, the communication system only has real-time information and does not record historical information. That is, when the user shuts down or leaves the area, the information changes or disappears.
Readers who have a little understanding of mobile communications may think that it is HSS that stores mobile phone user activity track information. This idea is not accurate.
HSS, the full name is Home Subscriber Server, which is the home subscriber server. It was previously called HLR (Home Location Register) . This network element device is used to store the user’s basic data and contract information, such as how much the user’s number is, whether it is down, what business functions are enabled, what are the keys, and so on.
However, HSS does not record the user’s historical track.
So, who does not pass HSS?
The answer is-CDR.
The bill of words here and the bill of words we usually say are two concepts.
We usually check through the carrier app, that’s the bill. In addition to the bill, there is a detailed bill.
The detailed list is closely related to the list of words we want to say.
In simple terms, the detailed list in the mobile app is a simplification of the list that we have in the industry and is convenient for users to check.
The CDRs in the communications industry are also called CDR (Call Detail Record, call detail record ).
It is a kind of file data passed inside the communication system .
Sample Bill File
(I haven’t been to the scene for a long time, Xiaozaojun found a record from ten years ago)
Each record in it consists of different fields. Each field has a specific meaning. It is difficult to read directly. It must be interpreted according to the bill format specifications of each operator.
To put it plainly, CDR bills are not for people to see, they are for operators’ BOSS platforms. BOSS here is not the boss’s meaning, it refers to Business & Operation Support System (Business Operation Support System) .
The BOSS system dialog is parsed, then detailed bills and bills are generated and sent to the user for a fee.
Maybe someone will ask: Will I have a CDR bill if I don’t call?
Of course it does.
CDR bills are divided into many types, voice bills, SMS bills, and the most important-data service bills.
When you use your mobile phone to access the Internet, you are using the operator’s data service network and will generate data service bills.
In the bill, you have your current access network location information.
The detailed list found by the operator’s App is the processed CDR note with location information in it.
In the past, you were judged whether you were roaming or compared with the home place based on the location information in the bill. Later, roaming charges were cancelled, and such information was not so important.
In short, big data platforms only need to collect billing data for operators in various provinces and regions to obtain user movement trajectory information.
It is understood that, in addition to billing bills, the big data platform will also collect user registration information. Billing system) , and signaling data.
Signaling data is troublesome.
We know that, From the moment the mobile phone is turned on, it continuously performs signaling interaction with the communication system. A simple call will generate hundreds of signaling data. This amount of data is huge.
Even after filtering and filtering, this amount of data is amazing.
Signaling data, plus user billing data, plus user registration information, are aggregated into a huge data torrent, which impacts big data platforms.
At present, this big data platform is still very powerful, hold it, and it is slowly playing a role.
In addition to querying mobile phone movement trajectories, there are actually many functions of big data platforms. For example, based on signaling, analyze the distribution density and flow trend of personnel, and help local governments organize the release of anti-epidemic materials and arrange prevention and control manpower.
It is foreseeable that with the deepening of information sharing, to the extent permitted by law, this big data platform will play an increasingly greater role and ultimately help us to overcome the epidemic.
Okay, that’s it for today.
Technology fights the “epidemic” and communication is in action. Come on, everybody!