Cellular IP - a new approach to Internet host mobility

Cellular IP - a new approach to Internet host mobility -...

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Unformatted text preview: Cellular IP: A New Approach to Internet Host Mobility Andrs G. Valk 1 Ericsson Research andras.valko@lt.eth.ericsson.se Abstract This paper describes a new approach to Internet host mobility. We argue that by separating local and wide area mobility, the performance of existing mobile host protocols (e.g. Mobile IP) can be significantly improved. We propose Cellular IP, a new lightweight and robust protocol that is optimized to support local mobility but efficiently interworks with Mobile IP to provide wide area mobility support. Cellular IP shows great benefit in comparison to existing host mobility proposals for environments where mobile hosts migrate frequently, which we argue, will be the rule rather than the exception as Internet wireless access becomes ubiquitous. Cellular IP maintains distributed cache for location management and routing purposes. Distributed paging cache coarsely maintains the position of idle mobile hosts in a service area. Cellular IP uses this paging cache to quickly and efficiently pinpoint idle mobile hosts that wish to engage in active communications. This approach is beneficial because it can accommodate a large number of users attached to the network without overloading the location management system. Distributed routing cache maintains the position of active mobile hosts in the service area and dynamically refreshes the routing state in response to the handoff of active mobile hosts. These distributed location management and routing algorithms lend themselves to a simple and low cost implementation of Internet host mobility requiring no new packet formats, encapsulations or address space allocation beyond what is present in IP. 1 INTRODUCTION As computers become smaller and global networking ubiquitous, the demand to provide network access to mobile users will grow rapidly. Recently, a number of IP frameworks have emerged to offer connectivity to mobile users [1] [2] [3] [4]. A basic difficulty that these protocols address is that the host address in IP has dual significance. First, as a unique identifier it should be kept constant regardless of host mobility. Second, in its role as a location pointer it should change as hosts change location [5]. These are competing require- ments that mobile host protocols should efficiently resolve. A fundamental problem to solve is therefore the separation of these two goals while an up-to-date mapping of host identifiers to location information is made available. Overviews of existing protocol proposals are presented in [5] and [6]. In this paper we address host mobility in an environment where a wireless connection to the Internet is typical, rather than as it is today, an exception. We therefore assume an environment where highly mobile hosts often migrate during active data transfer and expect the network to manage these handoffs with mini- mum disturbance to ongoing data sessions. While people rarely read text or watch video while walking or driving, they may wish to, however, download files, browse the web, or talk on the Internet phone while on...
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This note was uploaded on 10/19/2009 for the course CNT 5517 taught by Professor Helal during the Fall '09 term at University of Florida.

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Cellular IP - a new approach to Internet host mobility -...

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