An Internet infrastructure far cellular CDMA networks using mobile IP

The CDMA community, under the umbrella of the 3rd Generation Partnership Pr oject 2, has embarked on a standardization effort for wireless data based o n Mobile IP. Important issues addressed include the link layer interface to a Mobile TP foreign agent, how link-layer mobility interacts with IP-layer mobility; how virtual private network services will be supported; and how to provide authentication, authorization, and accounting in a cellular Mobi le IP environment. Members of 3GPP2 are also active in the Internet Enginee ring Task Force's Mobile IP, ROAMOPS, and AAA working groups. Based on our experiences in this effort, this article gives an overview of the issues we have encountered in standardizing a Mobile-IP-based network architecture i n a cellular telephony environment, including current points of contention, and gives a summary of the current state of the standards.