Reaching And Application Of Mobile Networks Instant Message System PICA

With Instant Messaging (IM) successfully applied to PC and The third Generation (3G) coming, Wireless Internet connection speed enhanced, Wireless Internet and Internet connected strengthened, Instant Messaging (IM) is bound to apply to combined set.In this paper, I briefly summarize the Instant Messaging (IM) how to apply to combined set. PICA is an IM to apply to combined set on the base of the Jabber Protocol. Jabber is a set of streaming XML protocol and technologies that enable any two entities on the Internet to exchange messages, presence, and other structured information in close to real time. I introduced what the Jabber protocol is and that the process of communication between PICA client and PICA server. The mainly key technologies and my researches are followed:1. The design of system structure(1) We design the system to 3-tier c/s architecture which is PICA Client system, 3-tier c/s architecture is that applications will be divided into functional expressed layer, the functional layer, data layer three parts. Its solution is : a clear separation of these three levels, and logically to independence. DBMS has the original data layers as independent, so that the key is to layer and function layer separated into separate procedures, but also the interface between the two-tier concise.(2) The system involves three roles: User, Jabber server, Internet.(3) PICA Client and PICA Server communicate with the GPRS.(4) Jabber Server and Jabber Server communicate with the Internet..2. The key technology of the system(1) The Operation System of The main Server is LINUX. The Operation System of The Client is J2ME.(2) The communication technology between client and server is PUSH technology and PULL technology.(3) The Client and The Server exchange messages on the base of a set of streaming XML protocol.(4) How to solve the element of server balancing distribution.(5) The Client is devised by the multi-threads.3. The innovation of the system(1) The communication between client and server is PUSH technology and PULL technology.(2) The system defined the Jabber XML protocol regain .(3) The server devised a middle module, in order to solve the server moment balancing distribution, it is S2S.The aim of design about the PICA system is to realize that Instant Messaging (IM) apply to the combined set.. Users can feel the advantages in the combined set as if in PC. The system can attain to million registering user only one year.