Seminar Mobilkommunikation SS 2001

Der vorliegende Interne Bericht enthält die Beiträge des Seminars Mobilkommunikation vom Sommersemester 2001. Die Themenauswahl kann grob in folgende vier Blöcke gegliedert werden: 1. Protokolle und Konzepte zur Mikromobilitätsunterstützung, die als Erweiterung des Makromobilitätsprotokolls Mobile IP schnelle Handover innerhalb einer Domäne als Ziel haben und den Skalierbarkeitsaspekt von Mobile IP ansprechen. Insbesondere werden die Protokolle Hierarchical Mobile IPv6 und Cellular IP behandelt. 2. IP Routingalgorithmen in mobilen ad-hoc Netzen. In einer Doppelarbeit werden diverse Unicast- und Multicast Routingalgorithmen, in einer weiteren Arbeit diverse Clusteringalgorithmen behandelt. 3. Sicherheits- und Privacy Konzepte. Eine Arbeit widmet sich der Location Privacy in der Mobilkommunikation, während sich eine weitere mit dem Aufbau einer AAA-Infrastruktur in Mobile IP-Netzen befasst. 4. IP in Mobilfunknetzen. In dieser Arbeit geht es um eine IP-basierte UMTS Systemarchitektur

Building an IP-based community wireless mesh network: Assessment

Wireless mesh networks are experiencing rapid progress and inspiring numerous applica tions in different scenarios, due to features such as autoconfiguration, self healing, connec tivity coverage extension and support for dynamic topologies. These particular characteristics make wireless mesh networks an appropriate architectural basis for the design of easy to deploy community or neighbourhood networks. One of the main chal lenges in building a community network using mesh networks is the minimisation of user intervention in the IP address configuration of the network nodes. In this paper we first consider the process of building an IP based mesh network using typical residential rou ters, exploring the options for the configuration of their wireless interfaces. Then we focus on IP address autoconfiguration, identifying the specific requirements for community mesh networks and analysing the applicability of existing solutions. As a result of that analysis, we select PACMAN, an efficient distributed address autoconfiguration mechanism origi nally designed for ad hoc networks, and we perform an experimental study using off the shelf routers and assuming worst case scenarios analysing its behaviour as an IP address autoconfiguration mechanism for community wireless mesh networks. The results of the conducted assessment show that PACMAN meets all the identified requirements of the community scenario.European Community´s Seventh Framework ProgramPublicad

PACMAN: Passive Autoconfiguration for Mobile Ad hoc Networks

Mobile ad hoc networks (MANETs) enable the communication between mobile nodes via multi-hop wireless routes without depending on a communication infrastructure. In contrast to infrastructure-based networks, MANETs support autonomous and spontaneous networking and, thus, should be capable of self-organization and-configuration. This paper presents PACMAN, a novel approach for the efficient distributed address autoconfiguration of mobile ad hoc networks. Special features of PACMAN are the support for frequent network partitioning and merging, and very low protocol overhead. This is accomplished by using cross-layer information derived from ongoing routing protocol traffic. E.g., address conflicts are detected in a passive manner based on anomalies in routing protocol traffic. Furthermore, PACMAN assigns IP addresses in a way that enables their compression, which can significantly reduce the routing protocol overhead. The performance of PACMAN is analyzed in detail based on various simulation results

Passive Autoconfiguration of Mobile Ad hoc Networks

Mobile ad hoc networks (MANETs) enable communication between mobile nodes via multi-hop wireless routes without depending on an infrastructure. In contrast to infrastructurebased networks, MANETs support spontaneous networking and, thus, should be capable of self-organization and-configuration. The paper presents PACMAN, a novel approach for an efficient distributed address autoconfiguration of mobile ad hoc networks. PACMAN works almost entirely passive and thus has very low protocol overhead and high energy efficiency. This is accomplished by using cross-layer information obtained from ongoing routing-protocol traffic. A modular architecture alleviates the problem of routing protocol dependency and the application to three current routing protocols is discussed. Futhermore, PACMAN assigns IP addresses in a manner that enables the compression of IP addresses, which can reduce the routingprotocol overhead significantly

IPv6 Autoconfiguration in Large Scale Mobile Ad-Hoc Networks

Mobile ad-hoc networks are infrastructure-free, highly dynamic wireless networks, where central administration or configuration by the user is impractical. The Internet Protocol IPv6 defines mechanisms to autoconfigure interfaces of nodes in wired networks in a distributed manner. In this paper, the applicability of IPv6 Stateless Address Autoconfiguration and IPv6 Neighbor Discovery Protocol to large scale mobile ad-hoc networks is investigated. A hierarchical approach based on so-called leader nodes is proposed together with a leader election algorithm. Address autoconfiguration with IPv6 in very dynamic ad-hoc networks requires special support as, for example, outlined within this paper. Extensions to the IPv6 Neighbor Discovery Protocol are proposed to enable an efficient and scalable usage in ad-hoc networks