Research And Realization Of MMS In Remote Monitoring Terminal System

Along with the third generation mobile communication technology maturing gradually,today the multimedia messaging service becomes a hot spots of mobile service research inwhole world scope. MMS is one kind of brand-new service based on the wireless applicationprotocol WAP. The biggest characteristic of MMS is to support multimedia functions. Manytype of data message can be transmitted using MMS, including text, picture, animation andvideo and so on. Now MMS application cannot be only located to let users download MMSinformation or share entertainment and graph information with other people, but should bedeveloped the multiplex application. Therefore, researching MMS technology and realizingthe corresponding multiplex application has the research value and the market benefit.According to actual need, cooperating with Lanzhou public security bureau relevancebranch, this topic is designed a set of remote monitoring terminal system composed ofhardware and software based on the realization of MMS. This system assembles the functionof information collecting, auto-saving, picture compressing and coding automatically into onewhole, and transmits image message currently using GPRS wireless transmission technologyand MMS technology at the public mobile network, so as to controls monitoring informationat real time. The protocols of MMS encode and encapsulations are mainly analyzed, realizingthe problem of MMS encapsulation, wireless network connection and MMS sending.Firstly basic concept of MMS and WAP is introduced, including MMS network structureand the working principle. Then the design of remote monitoring terminal system is given,including analyzing the system purpose, realization mentality, system principle frame diagram,software and hardware constituent, software flow chart of this system and MMS realizationprocess. The related protocols of MMS encapsulation, wireless network connection and MMSsending are mainly analyzed, including analyzing the protocol of MMS encapsulation,specifically MMS PDU model, MMS PDU header and MMS encapsulation format; analyzingthe protocol of wireless network connection, specifically AT command and PPP connection;analyzing the protocol of MMS sending based on the WAP, specifically MMS sendingencapsulation format, including WSP, WTP and WDP. The way of realization to this designis to acquire data stream of MMS sending and wireless network connection, and analyze dataaccording to the protocol. Simultaneously the programming is realized by C. Finally thefuture research direction and the development target of this topic is carried on an outlook.