| The so-called Information Push (PUSH) technical services, is opposed to the traditional second-generation browser's core technology services. The biggest difference between users and information is the relationship between information from Latin America (PULL) service is in "pull" the role of technology under the "users to find information" and information technology is pushing the "push" technology role "Information for users." Push information technology services as early as 1996 by PointCast NetWork company. Through certain technical standards or agreements from the Internet source of information or information where producers access to information through regular channels send messages to users of new communication systems. It is based on the information needs of users, in a targeted manner and purpose of the user the information needed to take the initiative to serve customers. Its basic work flow is: first single-user filled out a subscription, including user profile, the types of information required and the need to push the time-related content, and to submit it to information providers, information providers and users to subscribe to the collection of single-related content, Presented by the Push push client server, client access to information after inform users can read the message. Its contents: First, direct sources of information in the information itself sent to the user and the other is only the relevant information to the directory or index notice sent to the user, in accordance with the notification by the user to query the appropriate information.PUSH technology in Internet could not get the big success, due to many factors. In the fixed network of computers and other fixed equipment provides users with sufficient resources and the ability to find information so users usually as a window to the information, rather than passive recipients of information. Fixed network users for the accuracy of the information requested Yuanshen Yu its timeliness of the request.In mobile networks, because there is a network bandwidth, mobile devices and high capacity rates, and many other restrictions, users do not like the fixed network as easy to find information, if the information will be important and timely initiative pushed to the user On mobile devices, it will undoubtedly greatly facilitate the users. Mobile communication has the advantages of mobile devices can receive information anywhere, anytime, PUSH technology in the mobile network part in important role. The main work, difficult and innovation are as follows:(1) PUSH technology is a way through asynchronous transfer the information to the equipment and automatically start MIDlet process. Usually a network connection, the client take the initiative to connect to server, the server handling of the request information and respond to the request of the client, which is simultaneously handling mechanism.(2) from the server push information to mobile devices will have some questions: if we want to send a message to a specified port registered in the monitoring of the flow socket specific equipment, we must know that the mobile phone wireless network IP. Because in wireless networks, many of the non-use of the phone always connected environment (Sometimes, providers do not support the equipment in the network of static IP), send a message to the device is a problem. If we do not know that the wireless equipment IP, we will not be able to use the socket connection from the server send a message to the device. (3) Short Message Service (SMS) in such circumstances has put to use. The use of SMS, we specify the target device's phone number so in this case, we do not need to know the IP address of equipment. However, the use of SMS as a trigger will bring about the same number of issues: MIDP2.0 standard only because the definition and socket for data reported in connection with the grammar, but not for SMS connections, so does not guarantee that all the support MIDP2.0 The equipment can use SMS as a trigger to push for registration. However, wireless news API (WMA1.1) - In a MIDP on the SMS will support the optional package - now get the support of many mobile devices, there is a greater possibility, SMS push registration as a trigger mechanism will be a lot of Equipment support.(4) from the server send an SMS message to the device is not straightforward, because there are many ways exist. SMS service provider API (or exposed services URL), through which the API you from your server-side applications you send a message to the specified mobile phone. However, this method relies on SMS service provider and its special projects. Optional way is to use a GSM modem, so the need to make GSM modem with your server-side applications to interact.(5) study and use of a serial communication JAVA API and SMSlib (an open source software package) the Java version of the API through the use of PC-GSM Modem send and receive SMS text messages.(6) PUSH Http technology and technology by combining mobile phone servers and clients, client and the client's asynchronous communication, SMSlib research and open source software use, with examples of software. |
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