With the development of mobile e-commerce, mobile phone consumption has become the mainstream payment method for people's current consumption. As a result, POS machines have been widely used, but in view of the security of mobile phone consumption, users have to wait for printing consumption after consumption. The series of operations such as vouchers and user signatures not only increased the queue waiting time, but also wasted a lot of paper resources. According to one survey, the most unbearable for consumers in the credit card payment process is the large queue waiting time and the cumbersome Processing program. In response to this shortcoming, this paper designs a new type of POS machine, which is optimized on the basis of the current POS machine process, making full use of the convenience and security of the current advanced mobile network. It simplifies the user consumption process, greatly reduces the user's waiting time for queuing, and at the same time saves paper resources and greatly optimizes the user experience. With the rapid development of mobile e-commerce, the scope of use of POS machines has spread to large and small supermarkets, hotels, etc. in China, and the types of POS machines are also diversified: internet, wireless, etc. [1], but due to tradition The security factors that pos equipment must guarantee must require consumers or users to perform on-site credit card after consumption, POS machine to print consumption vouchers on site, consumers or users to sign on the voucher and other series operations, not only greatly increase Waiting for the queue, it also wastes a lot of paper resources. According to statistics, the most unbearable for consumers in the consumption process is long queues. Many large and medium-sized retailers have realized that shortening the queue before POS The time has now become the key to improving customer relationships. As can be seen from the above table, there are various POS terminals on the market at present, but no matter which of the above POS terminals, the functions implemented are the same, so that the card swipe process is the same. The traditional wireless POS structure is as follows [3]: Traditional wireless POS transaction process [3]: Flow Description:
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1. introduction
In recent years, the global mobile payment market has shown a rapid growth trend. Global mobile payment revenue has grown exponentially since 2004, from $5.5 billion in 2002 to nearly $20 billion in 2005, with an average annual growth rate of over 100%. Mobile payment services have been launched in more than 30 countries and regions around the world, and East Asia is regarded as the fastest growing region for global mobile payments. Korea and Japan are currently the world's leading mobile payment development countries. At present, in South Korea, more than 300,000 people choose to have a mobile phone that can store bank transaction data and encrypt transaction information when purchasing a new mobile phone. Japan has made a bold and successful attempt to implement mobile payment. Felica's proximity contactless communication technology is becoming more and more popular in Japan. In just over half a year, the number of new users has exceeded 3 million, and the number of retailers installing contactless chip readers has reached more than 20,000. In terms of transaction size, according to the forecast of research consultancy BWCS, it is estimated that by 2010, the global market for mobile only on-site payment (excluding virtual payment) will reach 380 billion US dollars. China's mobile e-commerce has also been greatly developed in recent years. The specific data is shown in the following figure: 
Figure 1 No-voucher POS terminal card process
2. Design method of traditional POS machine
The types of POS machines currently on the market can be summarized as follows: 
2.1 Traditional POS card swiping process
The functional block diagram of the traditional wireless POS is shown below [2]: 
Figure 2 Traditional wireless POS function module diagram 
Figure 3 Traditional wireless POS structure
(1) Wireless POS collects user data.
(2) The wireless POS sends a GPRS access request in the wireless environment, and sends data to the GPRS network under the condition that the line is unblocked.
(3) The data is sent to the mobile information server via the GPRS network, and the application server of the mobile company is summarized through the operator data network.
(4) After the data is processed by the application server, the data is sent to the bank's firewall through a dedicated line.
(5) After the packet security check and IP address translation, the data is sent to the bank POS server.
(6) After the data is processed by the intermediate service platform and the bank account host, the data is returned to the POS server.
(7) The POS server feeds back the information to the mobile company's application server.
(8) The mobile company's application server returns the response data to the corresponding mobile information server.
(9) Wireless POS print transaction voucher.
(10) The user confirms the signature.
2.2 Conventional POS machine card process drawbacks
For the traditional POS card swiping process, POS tools (such as bank card POS machines) that require user confirmation not only greatly increase the waiting time for queuing, but also waste a lot of paper resources. POS machines that do not require user confirmation (such as bus card swipe) can not give users a certain amount of proof of consumption. Users do not have a good consumer experience.
3 new POS machine design method
In view of the shortcomings of traditional POS card swiping, we can improve the existing process, and at the same time ensure the timeliness of the voucher sending and the confidentiality of the key information consumed by the user.
3.1 Card swipe process
We can improve the POS card swipe process as follows: 
Figure 4 No-voucher POS terminal card process
Step 1: The mobile terminal is swiping the card at the POS terminal with no paper certificate (the card can pass 13.56M, 2.4G mode, etc.), and the user can leave after the POS terminal displays the successful card swipe. No need to wait for a receipt to print.
Step 2: The POS terminal saves the user's card information to the local, and simultaneously sends the user's card information to the background system through GPRS networking.
Step 3: The background system processes the user's card information to generate the voucher information, and then sends the voucher information to the SMS/MMS gateway (the voucher information form may be an encrypted SMS or MMS message, or may be a QR code, etc.) form).
Step 4: The SMS/MMS gateway sends the voucher information to the user's mobile phone terminal, so that the user can perform a voucher backup for the card swipe operation.
The above process shows that, based on this new type of POS machine, the functional modules used are not different from the traditional POS machines. That is, no improvement is required for the POS machine that is currently deployed. Traditional POS machines can still be used.
Relative to the background, all information processing is processed by the background system connected to the mobile network, and then sent to the user's mobile phone through the mobile gateway. In this way, the function of the system can be improved and the business can be carried out and promoted. Achieve the smallest changes, the fastest implementation purpose.
3.2 Advantages of the new POS machine
The method can provide the user with a paperless POS certificate, can save a large amount of paper, and has an environmental protection function;
The method removes the link of the POS terminal printer to print the voucher, reduces the waiting time for the user to swipe the card, and makes the user's use experience better.
The method solves the problem of sending and receiving credit card vouchers in other non-voucher usage scenarios (such as public transportation);
The method encrypts the user's card vouchers and sends them to the user's mobile phone through MMS, SMS, or QR code, so that the vouchers can be identified, certifiable, and anti-forgery functions;
The method can still provide a card swipe certificate to the user on the undocumented POS terminal, that is, the user performs the credit card operation backup and also facilitates the user to perform the swipe operation query.
4. to sum up
By improving the existing POS machine process, it is possible to ensure the timeliness of the voucher transmission and the confidentiality of the key information consumed by the user. It also allows users to have a credit card record on a POS machine without POS credentials. It is convenient for users to check and increase the user experience.
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