We present a novel approach to building and deploying network protocols. The approach is based on mobile code, demand loading, and caching techniques. The architecture of our system allows new protocols to be dynamically deployed at both routers and end systems, without the need forcoordination and without unwanted interaction between co-existing protocols. In this paper, we describe our architecture and its realization in a prototype implementation. To demonstrate how to exploit our architecture, we present two simple protocols that operate within our prototype to introduce multicast and mobility services into a network that initially lacks them. 1

Abstract — Mobile IP is the current standard for supporting macromobility of mobile hosts. However, in the case of micro-mobility support, there are several competing proposals. In this paper, we present the design, implementation, and performance evaluation of HAWAII: a domain-based approach for supporting mobility. HAWAII uses specialized path setup schemes which install host-based forwarding entries in specific routers to support intra-domain micro-mobility. These path setup schemes deliver excellent performance by reducing mobility related disruption to user applications. Also, mobile hosts retain their network address while moving within the domain, simplifying QoS support. Furthermore, reliability is achieved through maintaining soft-state forwarding entries for the mobile hosts and leveraging fault detection mechanisms built in existing intradomain routing protocols. HAWAII defaults to using Mobile IP for macromobility, thus providing a comprehensive solution for mobility support in wide-area wireless networks.

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Active networks permit applications to inject programs into the nodes of local and, more importantly, wide area networks. This supports faster service innovation by making it easier to deploy new network services. In this paper, we discuss both the potential impact of active network services on applications and how such services can be built and deployed. We explore the impact by suggesting sample uses and arguing how such uses would improve application performance. We explore the design of active networks by presenting a novel architecture, ants, that adds extensibility at the network layer and allows for incremental deployment of active nodes within the Internet. In doing so, ants tackles the challenges of ensuring that the exibility o ered by active networks does not adversely impact performance orsecurity. Finally, we demonstrate how a new network service may be expressed in ants.

In recent years, several position-based routing protocols have been developed for mobile ad hoc networks. Many of these protocols assume a location service is available that provides location information on the nodes in the network. In this chapter, we survey all the proposed location information services that exist in the literature to date. We classify these location information services into three categories: proactive location database systems, proactive location dissemination systems, and reactive location systems.

In this thesis, we propose two algorithms for network load reduction in ad hoc networks. With the increasing popularity of mobile computing and Internet based client-server applications, such algorithms should become popular.

With the huge growth and the market for laptop and palmtop computer purchases, a rapid increase of mobile usage in the Internet is expected. As mobile nodes move in a wireless computer network, a mobile node must determine when to switch its link-level point of attachment to the wired network. In this paper, we present six cell switching techniques and discuss their attributes. Specifically, we present the Late, Early, and Strong cell switching techniques and three variations of them. We then investigate the performance of these six techniques to discover the best method a mobile node should use to determine when to perform its re-attachment to the wired network.

This document investigates handover in All-IP wireless networks. It works out general trends in network services and architectures of future IP-based wireless networks with an impact on handover design. The main contribution of this document is the description and comparison of the handover approaches which have been identified as state-of-the-art in the research community: IETF Mobile IPv4 [17], Extensions of IETF Mobile IP (hierarchical foreign agents [7, 8, 9], route optimization [18], flexible mobility support [33]), IETF Mobile IPv6 [11], Reverse Address Translation (RAT) [24], multicast-based handover [6, 14, 26], HAWAII [19, 20], Cellular IP [28], Mobile People Architecture [13], ICEBERG [29], Extended SIP Mobility [30]. There are two main results of the document: Foremost it is explained how the approaches solve the general mobility problem. Secondly it is stressed how the approaches meet the demands arising from new user and network requirements and technical opportunities of ...

The MOMBASA Software Environment is a toolkit that implements mobility-related functionalities complementing multicast protocols for multicast-based mobility support. The functionalities provided by the MOMBASA Software Environment include detection of link availability, registration, location update, paging, address translation, handoff initiation, handoff control, rerouting, prevention of hando oscillation and inactive handoff suppression.

In order to ensure quality of service for real-time communication in a mobile wireless Internet environment, it is essential to minimize the transient packet loss when the mobile host (MH) is moving between different cells (subnets) within a domain. A variety of network layer mobility management scheme have been proposed to provide fast handoff for multimedia streams when an MH moves within a domain. This paper introduces application layer techniques to achieve fast handoff for real-time (RTP/UDP) multimedia traffic in a SIP-based signaling environment. These techniques are based on standard SIP components such as user agents and proxies which usually participate to set up and tear down the multimedia sessions between the mobiles. Unlike network layer based techniques, they do not depend on any additional components such as home or foreign agents in the middle of the network, thus providing a network-independent solution suitable for application service providers. I.