【作者】 魏凯；

【导师】 黄战华；

【作者基本信息】 天津大学 ， 光学工程， 2007， 硕士

【摘要】 近年来,移动通信技术的发展,带给我们的是前所未有的信息盛宴。而作为3G时代的提前体验,多媒体消息业务(MMS)极大的丰富了无线数据通讯的应用。本文介绍了一种基于现有GPRS无线网络平台,将多媒体消息作为信息载体,借助计算机等非手机移动终端设备,实现远距离数据传输的方法,并且对相关技术标准及事务流程进行了详细分析和说明。本文的主要工作包括以下几个方面:1、将计算机作为源端数据采集及处理设备,在VC环境下,通过C语言编写程序,由AT命令控制GPRS modem拨号,建立网络连接;然后在实现UDP Socket通信机制的基础上,利用WSP会话管理工具与中国移动的WAP网关建立会话。2、按照多媒体消息及SMIL相关协议的要求,对发送端数据进行整理,封装一个多媒体消息协议数据单元(M-Send.req PDU),通过发起WSP POST动作,将数据包投递至WAP网关,完成信息发送。而在目的端,由支持彩信功能的手机成功接收。3、尝试向嵌入式系统进行方案移植。在源端,依据PPP协商机制,建立数据链路连接,完成对modem的拨号控制,并成功获取动态分配的IP地址,为实现嵌入式多媒体消息的发送奠定了基础。同时在目的端,通过WSP GET动作,获取多媒体消息所在的网页信息,从而为进一步处理接收到的信息提供了可能。4、对多媒体格式消息中的中文信息部分的处理进行说明。通过建立GB2312-80到Unicode的编码映射表,以相对简单的方式获得中文字符的Unicode码,从而达到多媒体消息协议对中文内容的编码要求。更多还原

【Abstract】 Nowadays, what the mobile communication brings to us is an information carnival, through the development of technology. As the advancing experience of 3G era, Multiple Messaging Service (MMS) enriches the application of wireless data communication.In this paper, a method of realizing long-distance data transmission by dint of none-mobile-phone termial is introduced, which using MMS as the information carrier,based on the exsisted wireless network platform-GPRS.Meanwhile,more details about the correlation technical standards and transaction flow are given.Some researches in this dissertation have been carried out as the following:1、On the originator terminal,computer is used to collect and process data.We implement a dial-up connection by controlling the GPRS modem through AT Command,under the VC environment with the C language compilation;Then use WSP session management facility to connect with the WAP Gateway,establishing a session,based on the UDP socket mechanism.2、Encapsulate a MMS Protocol Data Unit(MMS-Send.req PDU) containing the processed data we want to send, according to some related protocols of MMS and SMIL.Finally,the packets are forwarded to the gateway upon the normal WSP POST functionality,completing the sending successfully.3、Further research has been carried on in order to transplant the project design to some embedded system.On the originator terminal,we establish the data link via negotiation mechanism of PPP protocol,implementing the dial-up control,and ultimately,obtain the IP address of dynamic allocation,which helps to lay a foundation for the embed MMS transport.On the recipient terminal,we can gain the web page information where the Multiple Message has been located,by using the normal WSP GET method operation,which really make it possible to do some further processing work on the retrieved message.4、Furthermore, there are some descriptions of how to deal with the chinese character information in this treatise.It’s relatively convenient to get or output the Unicode of simplified Chinese character in virtue of creating a converting table between GB2312-80 and UCS2, according with the MMS criterion.更多还原