Stefan Aust

POLICY BASED MOBILE IP HANDOFF DECISION (POLIMAND) USING GENERIC LINK LAYER INFORMATION

There is currently a large variety of heterogeneous wireless access networks and cellular systems available, capable of providing data services. However, such systems require that users remain connected to a same network or terminate all communications when changing the point of attachment during handoff to another network or access technique. This paper describes link layer parameters which can be used to control Mobile IP (MIP) handoffs for seamless mobility. Based on a predefined Generic Link Layer (GLL) Mobile IP handoffs can be forced and can be used by different MIP systems, such as Hierarchical Mobile IP (HMIP) and Fast Mobile IP (FMIP). This paper describes a first implementation of a policy based Mobile IP handoff decision (POLIMAND) which uses link layer parameters for MIP handoff decisions.

Mobility management for an integrated network platform

This paper initially, describes the NOMAD test-bed being set up at ComNets for network integration to integrate various bearer technologies (GSM, GPRS, WLAN, Ethernet). It is based on different Mobile IP versions (IPv4 and IPv6) and software for ad-hoc networking using the AODV (Ad-hoc On Demand Vector routing) protocol. The second section describes the Mobile IP implementations and the improvements achieved in the area of handoff delays. The paper also details the results obtained from the ad-hoc network, to determine the performance of AODV when new nodes are added, and explains future research.

Design issues of Mobile IP handoffs between General Packet Radio Service (GPRS) networks and wireless LAN (WLAN) systems

This paper describes the system design and implementation of a demonstrator prototype, running at University of Bremen, which implements Mobile IP handoffs between GPRS and WLAN systems. Mobile IP requires public IP addresses but there is no support of such IP addresses by most mobile operators. To solve the problem of NAT (network address translation) and firewalls resulting from this, several concepts are available. This paper presents a practical implementation of one such concept where Mobile IP handoffs are realised using tunneling functions and an additional Mobile IP foreign agent to provide GPRS network access. Furthermore, this paper presents measurement results of the test bed and shows the quality of the Mobile IP handoffs.

Mobile IPv6 ad hoc gateway with handover optimization

The future demand of mobile Internet access in vehicles like busses or trains leads to an integration of ad hoc networks for an efficient and infrastructure-less multihop communication between mobile users. However, for wireless and mobile Internet access an infrastructure is needed which has to support mobility for ubiquitous wireless access. Mobile IPv6 allows mobility support also in combination with ad hoc, e.g., with AODVv6 (ad hoc on-demand distance vector) in future wireless networks. This study outlines the interworking of the mobility protocol mobile IPv6 and the multihop ad hoc routing protocol AODVv6. The integration leads to a mobile IPv6 ad hoc gateway that contains an optimization for vertical handovers between WLAN systems and cellular networks. The optimization is based on link layer information that is used to reduce packet loss during vertical handovers

Routing and Self-organization in IP based Wireless Access Networks (Routing und Selbstorganisation in drahtlosen IP-basierten Zugangsnetzen)

The BMBF project IPonAir addressed the integration of different wireless access systems with the Internet. This article gives a short overview of some of the project results in the area of mobile ad hoc networks (MANETs) and the integration of these networks with the Internet. Das BMBF Projekt IPonAir befasste sich mit der Integration von unterschiedlichen Mobilfunksystemen und dem Internet. Dieser Artikel gibt einen kurzen Überblick über einige der im Projekt erzielten Ergebnisse im Bereich der mobilen Ad-hoc-Netze und der Anbindung dieser Netze an das Internet.

IPonAir – Drahtloses Internet der nächsten Generation

Das BMB+F Projekt ‚IPonAir – Drahtloses Internet der nächsten Generation‘ [1] hat im Oktober 2001 begonnen. Koordiniert wird das Projekt von Prof. Dr. M. Zitterbart vom Institut für Telematik der Universität Karlsruhe (TH). Partner aus der Industrie sind Alcatel, Ericsson Eurolab Deutschland GmbH Aachen, T-Systems Nova, Lucent, NEC Europe Ltd., Nokia sowie Siemens. Als Hochschulen sind die Universitäten Karlsruhe (Koordination), Aachen, Berlin, München, Bonn, Bremen, Essen, Kassel, Frankfurt und die FH Friedberg vertreten. Dieser Artikel gibt einen Überblick über einige der im Rahmen des Projektes durchgeführten Arbeiten zu mobilen Ad-hoc-Netzen.