ULC——超低端手机平台，由2005年初GSM协会携手摩托罗拉、诺基亚等企业提出概念至今，已经成为手机领域内的一个庞大产业。ULC在中国等发展中国家得到了快速的发展与应用，与此同时，人们对ULC平台也提出了越来越多的新业务需求，其中最重要的需求是ULC平台对无线数据业务的支持。目前，Infineon公司的ULC2平台并不支持TCP/IP协议，当ULC2利用GPRS接入Internet时必须借助内嵌TCP/IP协议栈的数据终端设备支持处理数据，ULC平台实现难以独立与网络的交互，这已成为ULC网络新业务开发扩展的瓶颈。 本文设计了一套方案将TCP/IP协议嵌入ULC2平台并开发出相应的TCP/IP控制指令集，该方案使得ULC2实现了独立的TCP/IP处理，这不仅完善了其网络协议栈，更让ULC2脱离了对数据终端设备的依赖，同时新增的AT指令集为应用层提供了友好简洁的控制接口，使网络新应用的开发更加便捷。本方案实施后，ULC2平台具备了更加完备的Internet接入能力，这将大大扩展其使用范围。 本文首先阐述了ULC平台的发展现状，全面分析了为该平台嵌入TCP/IP协议的重要性，介绍了轻量级TCP/IP协议栈LwIP，包括LwIP的协议栈架构以及该协议中TCP、IP的实现过程；其次提出了一套完整的协议移植设计方案，分析比较了协议移植前后ULC2平台网络接入流程的异同并得出本设计方案的优势，详细阐述了本方案的实施过程，具体包括LwIP协议到OSE操作系统的移植和网络控制AT指令集的实现；最后对完成的样机进行测试，针对测试结果，总结了当前工作并对该设计方案提出了进一步完善的构想计划。

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 cell phone industry. ULC became the focus of mobile phone market of developing countries such as china. At the same time, people propose more and more new business requirements on ULC2,of which the most important one is the ability of Internet access ability.At present, the software of ULC2 platform of Infineon doesn’t comprise the TCP / IP protocol which means a DTE(data terminal equipment) embedded TCP/IP protocol stack is used to support ULC2 accessing 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/IP process independently without the reliance of a DTE, and providing some simple control interfaces for application layer. The specific method is embedding TCP / IP protocol into Infineon's ULC2 platform and developing a new set of command to control the TCP/IP protocol. 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 analysed comprehensively.Then the light weight TCP/IP protocol LwIP is introduced including the protocol structure of LwIP and the implement of TCP、IP. Second, a complete set of design is proposed and the compare the difference between the traditional Internet access method and new solutions is presented in the paper. The main work of the design comprises the transplant of LwIP protocol and the addition of AT command. Finally, current work is summarized and some new plan for future work to improve the product depend on the results of functional test is proposed in the paper.