1 Overview

The economic globalization and informationization in the world today have become the general trend of human society development. Informatization is becoming the main driving force for global trade, investment, capital flow, and technology transfer, as well as social, economic, and cultural development in all fields. "Digital City" will greatly promote the final realization of informatization in various fields and will play a crucial role in eliminating imbalances within and between regions.

“City One Card” is an important part of the construction of “Digital City”. It establishes a perfect, scientific, and safe “City One Card” system and integrates it into the field of social applications. It promotes the management level of the industrial field and improves and optimizes the urban synthesis. The management function, the promotion of resource integration, and the promotion of the city's image are of great significance. At present, "swipe cards" has become a quick and convenient payment method and means in people's daily lives. As a carrier of financial payments, the city pass card, the convenient consumer payment tool for urban residents has become a supplement and support for cash, credit card, bank card and other means of payment. Therefore, most cities across the country have already established the “city card” as their own Development goals, and gradually integrating "financial payment" with "digital information" to provide urban residents with convenient services, improve the quality of life of urban residents, and enable them to fully enjoy the digital information achievement of "a card in hand and worry-free" Convenient.

2. Concept

“Urban Card” refers to the use of a large-scale computer network system as a platform, an integrated circuit card (IC card) as a personal data storage medium, storage and processing of IC card consumption data through an IC card terminal charging device, and finally through the computer The application software and system implements a comprehensive consumer information system for data clearing and management.

The "City One Card" system is mainly responsible for the charging and operation management of urban public utilities, including urban public transportation, light rail, natural gas, water supply, electricity, heat, and parks. Through the implementation of the “City One Card” system, it can be realized that people can hold a credit card with a certain amount of IC card in advance and can use it for credit card spending in the utility industry without using cash to realize the consumption function of the electronic wallet.

3. Application range

The "City One Card" system involves payment, identity verification and social security functions in the fields related to citizen's life. It can complete pre-charging of public utilities, rapid settlement and payment in various fields such as finance and tourism, and can also be realized in cities where conditions permit. Applications in areas such as residential and parking lots, and implementation of basic social security functions. Its application areas include vertical and horizontal applications, vertical applications to solve a problem in the industry, horizontal applications to achieve a card between different industries, and ultimately achieve cross-industry one-card multi-purpose, unified management. The main applications are:

3.1 Utility Application

(1) Public transport: The functions of bus, subway, light rail, long-distance bus, taxi, toll and bridge charge card;

(2) Public utilities: water, gas, electricity, telecommunications, and credit card payment;

(3) Small-scale consumption: the application of telephone charges, cell phone charges, internet fees, car refueling, shopping malls, supermarkets, convenience stores, and fast food restaurants;

(4) Fees for entertainment venues: paid applications for tourist attractions, movie ticket entertainment centers, cultural stations, and Internet cafes.

3.2 Government Management Applications

(1) Social security: The medical insurance card, the pension insurance card, the unemployment insurance card, the work injury insurance card, and the maternity insurance card are attributed to a "city card" (Five Guarantees), and a provident fund;

(2) Management and application of other industries such as industry and commerce, traffic control, taxation, land, urban construction, and electricity.

3.3 Financial Payment Application

(1) Financial consumption: All the functions of the debit card (such as UnionPay card) for accessing funds, credit card consumption, etc., as securities and other financial transaction certificates;

(2) Industrial and commercial cards, tax cards, etc. issued for the unit;

(3) Other payment and information applications.

4. System composition
The "City One Card" application system is mainly composed of data collection system, clearing processing system, monitoring management system and customer service system.

4.1 Data Acquisition System

The data acquisition system is installed in the clearing processing center to collect the host and on-site acquisition server, and completes the data collection task through the database in real time. Taking into account the characteristics of centralized collection of bus and subway transaction data collection and issuing/recharging points are relatively scattered and distributed, the following solutions can be adopted:

(1) The bus transaction data is collected from the public subsystem. Since the daily transaction data volume is very large, the high-speed DDN special line is used to realize the real-time networking of the public subsystem network and the clearing processing center network. The network protocol is TCP/IP. The data is transmitted regularly every day.

(2) The card issuing/recharging point data collection has many points and decentralized characteristics, and the data volume is small. Each card issuing/recharging point equipment will be connected to the clearing processing center through the MODEM dialing method, and the transaction data will be transmitted to the central database. , to achieve the acquisition of transaction data; need to add two remote access servers (ACCESSSERVER) in the clearing processing center to achieve remote dial-up networking.

4.2 Clearing Processing System The clearing processing system is installed in the clearing processing center clearing host, real-time accounting of collected transaction data, centralized clearing and results distribution. The following scheme can be used:

(1) The clearing processing center uses 100M Fast Ethernet and the network protocol is TCP/IP;

(2) Clearing and processing center The large-scale relational database system is configured on the collection and clearing host as a central database to store the original transaction data and statistical data.

(3) The collection host collects the transaction data of the subway subsystem, public subsystems, and card issuing/recharging points to the central database of the clearing house in real time or at regular intervals;

(4) basic verification, billing, and statistics functions, completed by the database SQL language;

(5) to achieve statistical separation of the transaction data of each operator;

(6) Dynamic analysis of historical data to provide traffic flow analysis services;

(7) Configure a high-speed printer to print out accounting statements and statistical reports;

(8) The use of object-oriented programming tools to develop system application interface and daily management interface.

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