Cellular Internet Protocol

Cellular Internet Protocol

Abstract:

This document specifies a protocol that allows routing IP datagrams to a mobile host. The protocol is intended to provide local mobility and handoff support. It can interwork with Mobile IP [1] to provide wide area mobility support. Four fundamental design principles of the protocol are: (1) location information is stored in distributed data bases (2) location information referring to a mobile host is created and updated by regular IP datagrams originated by the said mobile host (3) location information is stored as soft state (4) location management for idle mobile hosts is separated from location management of hosts that are actively transmitting or receiving data.

Introduction:

Hosts connecting to the Internet via a wireless interface are likely to change their point of access frequently. A mechanism is required that ensures that packets addressed to moving hosts are successfully delivered with high probability. A change of access point during active data transmission or reception is called a handoff. During or immediately after a handoff, packet losses may occur due to delayed propagation of new location information. These losses should be minimized in order to avoid a degradation of service quality as handoff become more frequent.

This memo specifies Cellular IP, a protocol that provides mobility and handoff support for frequently moving hosts. It is intended to be used on a local level, for instance in a campus or metropolitan area network. Cellular IP can interwork with Mobile IP [1] to support wide area mobility, that is, mobility between Cellular IP
Networks.

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