No network, Internet access-information services based on USSD technology

There is no network, we can also surf the internet, this is a sound seems very contradictory things, we all know that now we through the mobile Internet is very convenient, now the Internet service has 2G, 3g,4g, a lot for us to choose, and we only need to buy a monthly traffic service from the telecom operators to enjoy the Internet, But the premise is that your mobile phone is a smart phone, support 2g,3g,4g the function of the Internet, but the development of China's national strength, buy a smart phone everyone is a little bit, even a person has more than one cell phone, and we talk about the USSD is to those who compare out mobile phones, or very backward countries, For example, in Cambodia, Africa These countries use, like the old Nokia, only support the telephone, texting, of course, there is a function is self-defense, this is not to say, USSD is to those who can only call to send text messages on the Internet, of course, we use the smart machine is not needed this technology, But there are still a lot of backward countries around the world that are being used, so let me introduce the USSD technology.

The unstructured Supplementary data Service USSD (unstructured supplementary Service data) is a network of GSM (Global system for mobile Communications) based on the World mobile communication system, A new type of interactive session data service on-line; Based on the user Identification module SIM (Subscriber Identity modules) card, the signaling channel of GSM network is used to transmit data, and it is a new business based on GSM short message system technology. The ability to develop business is far stronger than the SMS system.

USSD technology alone or with the short message technology, universal Packet Wireless service GPRS (General Packet Radio Service) technology, can provide customers with a wide range of value-added services, such as mobile banking, financial stock transactions, mobile phone calls, meteorological information forecast and query, Send and receive e-mails, flight inquiries, online bookings, polls, etc. The use of USSD has little effect on the structure of the original system, and the operator can offer the function business flexibly for the specific situation of the local network, conveniently provide various data services for the mobile users, and the USSD can be used not only for some information service, but also for the communication network provided by the mobile operator, which can be applied to the industrial scope. The application of USSD can greatly expand the scope of industrial monitoring communication, enhance the function and reduce the cost, so this kind of business has been widely used in the SAR, Singapore and other countries and regions, and has a wide application prospect in China.

Say so much, we still do not know how to use it, now we pick up our mobile phone (of course, the smart machine can also use this service)

I found the mobile USSD service number on the China Mobile website.

If you are in Guangzhou, Qingyuan, Yunfu, Shaoguan these places, immediately open the dial-up interface input *125#

Then click on the dial key, will get a display in the Phone interface menu, through the menu, select the business to be ordered, according to the different numbers prompted input, complete the business of the order function, can be used for telephone calls, password modification, function open, and all this is based on USSD data service.

Ps:facebook also provides their service numbers to a number of countries, which can be updated through USSD, post Weibo, and browse social services such as dynamic.

let's analyze USSD technology from a technical point of view :

Business Features:

Fast response : In interactive applications, because only one connection can be established, the delay of establishing the signaling connection is reduced, and the response time is shorter than that of short message, and the shortest is one-seventh of the short message.

easy to operate : Users do not need to go through the menu selection, but directly input the USSD command string;

Flexibility : Message content and length are more flexible;

support roaming : Every command of USSD goes through HLR (Home Location Register Attribution register), the user can roam in the same way as USSD business;

widely applicable : USSD Basically can be run on all GSM mobile phones at present;

Strong function : able to provide services in the form of dialogue and information business menu.

We compare USSD with SMS:

The biggest contrast between USSD and SMS is that USSD maintains a wireless connection during the session, provides transparent pipelines, no storage forwarding, and SMS does not have a session channel in the physical hosting layer, which is a storage and forwarding system

The advantages and disadvantages of this feature are obvious:

Advantage

Compared to SMS, do not store and forward, keep wireless connection, fast response speed;

Compared to WAP, it can be used in call state and non-call state, save voice channel, low demand for network and terminal.

Disadvantages

The use period will always occupy the signaling resources until the end of the business;

To some extent will affect the development of voice services and other business

USSD Network Structure

Interface protocol

USSD interface protocols are similar to short messages, using SMPP or CMPP. SMPP is an international agreement, CMPP is China Mobile based on the situation in the SMPP based on the agreement, the two systems are broadly the same, the scope of application is the same, but the format and content of the packet has a certain difference. CMPP has risen to 3.0 in the June 30, 2003 version.

Both messages are divided into the message header and the message body, where the length of the message header is fixed. The primary information is the total length of the message, the command type, and the message serial number. The command type is used to indicate whether the type of message is a connection, a message from the USSD Center to the business provider SP (Service Provider), a message from the SP to the USSD Center, disconnection and its response, and so on. The message serial number sequence is cumulative, the step is 1, and the serial number of a pair of request and reply messages must be the same. There is also a status message in SMPP that the response of the request message is successful, and the corresponding information in the CMPP is placed in the message body. The message body determines the length and data based on the type and content of the message, but it carries no more than 160 bytes of custom information, and the custom information is the short message content that is usually entered or received by the phone or the custom communication protocol portion of industrial communication. Cmpp adds a lot of information, especially billing and number information, relative to SMPP.

Finally, everyone's right to understand this technology, but also to prove that the development of the Internet in our country is booming, so that jumped over the USSD, directly embarked on the road of gprs,3g,4g, in order to commemorate the lost USSD, but also hope that USSD technology can flourish in more developing countries.

Gerry

The article turns from the Small Net school blog

Http://www.xiaozhangwx.com/blog/archives/78

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No network, internet access-information services based on USSD technology