Research On Multimedia Messaging Service Based On DFA

With the quick development of communications system of the third generation(3G),application of multimedia in mobile field has been focused on and moved from internet into mobile field in order to meet requirements from people in every aspect. MMS serve as the kernel module of information appliances, which support multimedia. As a critical technology in mobile field, there is little domestic research work about MMS. Foreign vendors have almost occupied the whole shares of MMS market. So it is quite urgent and necessary for us to master the MMS technology and produce our own MMS product.MMS may deliver multimedia data from one terminal to another, but the media format that can be delivered is quite limited. The content delivered includes MPEG-4/JPEG/GIF87/GIF89/GIF89A/MIDI/I-MELODY/AMR and TEXT media. A MMS terminal can send emails to a standard internet address and receive emails from internet mail server. The perspective is wide and work being done is to support all kinds of media such as steam media, bigger size, DRM and data security technology.This dissertation illuminates in detail the architecture and MMS component(including MMS client, MMS proxy relay ,MMS server and so on)functions as well as introducing and describing the presentation controlling language SMIL. Moreover, this dissertation analyzes the process and format of all kinds of transactions between MMS client and MMS proxy relay, encapsulation,encoding and decoding of all kinds of MMS PDU. Most importantly, it gives the theory model of implementation of the MMS client which is based on the DFA(Definite Finite Automachine)theory。...