Abstract new address must be edited into various configuration ” files. This paper describes a new protocol for transparently rout-ing packets to mobile hosts operating in a large internet-work. The protocol, called the Mobile Host Routing Proto-col (MHRP), allows any host to become mobile at any time, yet there is no penalty for a host being “mobile capable,” since the protocol automatically uses only the standard in-ternetwork routing mechanisms and adds no overhead when a mobile host is currently connected to its home network. The paper concentrates on the design of MHRP as it ap-plies to the Internet using IP. Mobile hosts use only their “home ’ ’ IP addresses, regardless of their current location in the Internet. No changes are required in stationary hosts that communicate with mobile hosts, and no changes are required in mobile hosts above the IP level. MHRP intro-duces several new features to provide better robustness for routing to mobile hosts, and provides better scalability to very large numbers of mobile hosts than previous mobile host protocols. 1.

This paper considers the problem of providing transparent support for very large numbers of mobile hosts within a large internetwork such as the Internet. The availability of powerful mobile computing devices and wireless networking products and services is increasing dramatically, but internetworking protocols such as IP used in the Internet do not currently support host movement. To address this need, the Internet Engineering Task Force (IETF) is currently developing protocols for mobile hosts in the Internet. This paper analyzes the problem to be solved, reviews the current state of that effort, and discusses its scalability to very large numbers of mobile hosts in a large internetwork. 1.

This paper describes a protocol that allows transparent routing of IP packets to mobile hosts in the Internet, while using only the mobile host's home IP address. The protocol, called IMHP (Internet Mobile Host Protocol), requires no changes in stationary hosts that communicate with mobile hosts, and requires no changes in mobile hosts above the IP level. IMHP quickly converges to optimal routing following the movement of a mobile host, while preserving the current level of security in the Internet. Detailed examples of operation are presented. Keywords: Mobile hosts; mobile networking; TCP/IP; internetworking; network protocols 1. Introduction Within the last few years, there has been impressive growth in the number of portable computers in use. Moreover, the fact that a computer is portable no longer implies that it has limited processing power. Today's mobile computers have hundreds of megabytes of disk space, window-based user interfaces, color displays, and sophisticated device...

In this dissertation, we examine the problem of performing handoff quickly in cellular data networks. We define handoff as the process of reconfiguring the mobile host, wireless network and backbone wired network to support communication after a user enters a different cell of the wireless network. In order to support applications and protocols used on wired networks, the handoff processing must not significantly affect the typical end-to-end loss or delay of any communications. This dissertation concentrates on two specific areas of handoff processing: routing updates and state distribution. The techniques we use to solve these problems are: 1. Multicast to set up routing in advance of handoff. 2. Hints

This paper describes the Internet Mobile Host Protocol

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Each Location Directory (LD) provides the information to locate the forwarding address of a Mobile Host (MH) in a mobile networking system. The LD should be updated when the MH moves from one access zone to another access zone. If an Internet Access Point (IAP) (or base station) could cache some useful LD information entries, then, after receiving a packet from an MH in its access zone, the IAP could check its cached LD and make an optimal routing decision. With the LD distributed over the Internet Access Points, we avoid Dogleg Routing because we no longer need to forward the packet to the Mobile Router (MR) where a master copy of the LD is located. In this paper, we investigate how the LD data structure is used, updated, and distributed among Mobile Routers, Internet Access Points, and Mobile Hosts. Furthermore, we present our LD design and implementation in the mobile IP network. Wu is supported by an IBM Fellowship. y Bhagwat is supported by an IBM Fellowship. 1 Introduction ...