Design And Implement Of Light Weight TCP/IP Protocol Stack LwIP On ULC2 Platform

ULC——ultra-low-end mobile platform,which is put forward by GSM Association,Motorola,Nokia and other firms at the beginning of 2005 has token up a large field of cellphone industry. ULC became the focus of mobile phone market of developing countries suchas china. At the same time, people propose more and more new business requirements onULC2,of which the most important one is the ability of Internet access ability.At present, thesoftware of ULC2 platform of Infineon doesn't comprise the TCP / IP protocol which means aDTE(data terminal equipment) embedded TCP/IP protocol stack is used to support ULC2accessing Internet through GPRS. It's the bottleneck of new application's extension.A plan is proposed in the paper which make ULC2 platform completeing the TCP/IPprocess independently without the reliance of a DTE, and providing some simple controlinterfaces for application layer. The specific method is embedding TCP / IP protocol intoInfineon's ULC2 platform and developing a new set of command to control the TCP/IPprotocol. Strengthen the ULC platform with TCP/IP protocol make it access Internet freely,which will greatly expand its scope of application.The development status of ULC platform is introduced at the beginning of the paper,and then the importance of embeding TCP/IP protocol into ULC platform is analysedcomprehensively.Then the light weight TCP/IP protocol LwIP is introduced including theprotocol structure of LwIP and the implement of TCP,IP. Second, a complete set of design isproposed and the compare the difference between the traditional Internet access method andnew solutions is presented in the paper. The main work of the design comprises the transplantof LwIP protocol and the addition of AT command. Finally, current work is summarized andsome new plan for future work to improve the product depend on the results of functional testis proposed in the paper.