GPRS、WCDMA、CDMA2000都属于可漫游移动用户的承载网络，都是在移动用户和远端数据网之间提供数据连接。本文将对作为一种移动数据业务承载网并且基于GSM的GPRS技术从协议栈的角度进行深入剖析。-GPRS, WCDMA, CDMA2000 are mobile users can roam the bearer network and mobile users in the remote data network to provide data connectivity between. In this paper, as a mobile data service bearer network and the GPRS based on GSM technology protocol stack from the perspective of in-depth analysis.