The Analysis And Design Of Package Handling And Communication Agent Module In Internet Short Massage Gateway

In GSM network, point-to-point short message service supports message transmission without traffic channel (TCH) for mobile subscribers. Now the service application is very extensive due to low costs and convenient usage. On the other hand, Internet service develops swiftly, and information resources are very rich. In order to make mobile subscriber share these rich resources , implementing communication between GSM and Internet is the first problem. Internet short message gateway (ISMG) is just a kernel entity to resolve it, which lies between two networks and is responsible for transferring, inspecting and recording message. So, with increasing of users and information, the performance of ISMG is the key factor of Internet short message application.According to Montemet Short Message Service Signaling Flow Specification, Linux based C language is adopted to implement ISMG software system in this thesis. Capacity and expansibility have also been resolved to enhance the performance of ISMG with emphasis.This thesis confirmed the functions of ISMG, namely protocol conversion, routing, store-and-forward, billing and so on. Finally according to Short Message Service Signaling Flow Specification, this thesis focuses on the design of the software structure, which completes ISMG basic functions. This gateway software consists of five parts as follows: package handling module, communication agent module, routing module, store-and-forward module and billing module. Package handling module (package_server) is responsible for assigning all received messages, which can advance real time capability; communication agent module (sp_agent&smc_agent) is responsible for communicating with external entities, but doesn't identify message contents, which can lighten burden of Package handling module. I emphasized the analysis and design of both modules in my thesis. The software design resolves capacity and expansibility of ISMG well. Finally, the thesis also points to some aspects to be improved in the software system.