21,015 research outputs found
Multicast-Based Mobile Ipv6 Join/Leave Mechanism Software
Increasing demand for mobility in the Internet has created the need for a routing
protocol that allows a host to roam in the network. Mobile IP is a solution that enables
an IP host to leave its home link while transparently maintaining all of its present
connections and remaining reachable to the rest of the Internet.
The Internet Engineering Task Force (IETF) has standardized Mobile IPv4. Mobile IPv6
is a work in progress in the IETF, offering support for IPv6 mobile nodes. Although it is
not yet standardized, every IPv6 node is required to implement Mobile IPv6, which
means that mobility must be widely supported.
IP-multicast provides efficient algorithms for multiple packet delivery. It also provides
location-independent group addressing. The receiver-initiated approach for IP-multicast
enables new receivers to join to a nearby branch of an already established multicast tree.
Hence, IP-multicast provides a scalable infrastructure for efficient, location-independent,
packet delivery.The recent advances in wireless communication technology and the growth of the
Internet have paved the way for wireless networking and IP mobility. Unlike
conventional wired networks, wireless networks possess different channel characteristics
and mobility dynamics that render network design and analysis more cha1lenging.
Performance during handoff where the mobile moves from one cell, or coverage area, to
another is a significant factor in evaluating wireless networks
Distributed All-IP Mobility Management Architecture Supported by the NDN Overlay
Two of the most promising candidate solutions for realizing the next-generation all-IP mobile networks are Mobile IPv6 (MIPv6), which is the host-based and global mobility supporting protocol, and Proxy MIPv6 (PMIPv6), which is the network-based and localized mobility supporting protocol. However, the unprecedented growth of mobile Internet traffic has resulted in the development of distributed mobility management (DMM) architecture by the Internet engineering task force DMM working group. The extension of the basic MIPv6 and PMIPv6 to support their distributed and scalable deployment in the future is one of the major goals of the DMM working group. We propose an all-IP-based mobility management architecture that leverages the concept of Named Data Networking (NDN), which is a distributed content management and addressing architecture. In the proposed solution, mobility support services are distributed among multiple anchor points at the edge of the network, thereby enabling a flat architecture that exploits name-based routing in NDN. Our approach overcomes some of the major limitations of centralized IP mobility management solutions, by extending existing routing protocol and mobility management architecture, to distribute the mobility management function of anchor points in the IP network and optimize the transmission path of mobile traffic
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Ubiquitous Internet in an integrated satellite-terrestrial environment: The SUITED solution
yesThe current Internet architecture appears to
not be particularly suited to addressing the
emerging needs of new classes of users who wish
to gain access to multimedia services made available
by ISPs, regardless of their location, while
in motion and with a guaranteed level of quality.
One of the main objectives of so-called nextgeneration
systems is to overcome the limitations
of today¿s available Internet by adopting an
approach based on the integration of different
mobile and fixed networks. The SUITED project
moves in this direction since it aims at contributing
to the design and deployment of the global
mobile broadband system (GMBS), a unique
satellite/terrestrial infrastructure ensuring
nomadic users access to Internet services with a
negotiated QoS. A description of the main features
of the GMBS architecture, characterized
by the integration of a multisegment access network
with a federated ISP network is given in
this article. The GMBS multimode terminal is
schematically described, and an overview of the
so-called QoS-aware mobility management
scheme, devised for such a heterogeneous scenario,is provided
Delivering Live Multimedia Streams to Mobile Hosts in a Wireless Internet with Multiple Content Aggregators
We consider the distribution of channels of live multimedia content (e.g., radio or TV broadcasts) via multiple content aggregators. In our work, an aggregator receives channels from content sources and redistributes them to a potentially large number of mobile hosts. Each aggregator can offer a channel in various configurations to cater for different wireless links, mobile hosts, and user preferences. As a result, a mobile host can generally choose from different configurations of the same channel offered by multiple alternative aggregators, which may be available through different interfaces (e.g., in a hotspot). A mobile host may need to handoff to another aggregator once it receives a channel. To prevent service disruption, a mobile host may for instance need to handoff to another aggregator when it leaves the subnets that make up its current aggregator�s service area (e.g., a hotspot or a cellular network).\ud
In this paper, we present the design of a system that enables (multi-homed) mobile hosts to seamlessly handoff from one aggregator to another so that they can continue to receive a channel wherever they go. We concentrate on handoffs between aggregators as a result of a mobile host crossing a subnet boundary. As part of the system, we discuss a lightweight application-level protocol that enables mobile hosts to select the aggregator that provides the �best� configuration of a channel. The protocol comes into play when a mobile host begins to receive a channel and when it crosses a subnet boundary while receiving the channel. We show how our protocol can be implemented using the standard IETF session control and description protocols SIP and SDP. The implementation combines SIP and SDP�s offer-answer model in a novel way
Scalable Support for Globally Moving Networks
This paper proposes a scalable solution for the support for globally moving networks. It is basically oriented to airborne mobile networks built in commercial aircrafts in order to provide Internet access to the passengers. As opposed to currently used solutions, the proposed solution has no impact in the global routing tables while it provides optimized paths between the mobile network and the rest of the Internet The proposed solution is an extension to the IETF standard network mobility support protocol and relies on the communication through multiple geographically distributed Home Agents in order to avoid panoramic routing imposed by single anchor points as in the case of a single Home Agent. The proposed solution includes a mechanism to select the best Home Agent to route new communications through.This project has been supported by Optinet project TIC-2003-09042-C03-01 and IMPROVISA project.Publicad
Transparent and scalable client-side server selection using netlets
Replication of web content in the Internet has been found to improve service response time, performance and reliability offered by web services. When working with such distributed server systems, the location of servers with respect to client nodes is found to affect service response time perceived by clients in addition to server load conditions. This is due to the characteristics of the network path segments through which client requests get routed. Hence, a number of researchers have advocated making server selection decisions at the client-side of the network. In this paper, we present a transparent approach for client-side server selection in the Internet using Netlet services. Netlets are autonomous, nomadic mobile software components which persist and roam in the network independently, providing predefined network services. In this application, Netlet based services embedded with intelligence to support server selection are deployed by servers close to potential client communities to setup dynamic service decision points within the network. An anycast address is used to identify available distributed decision points in the network. Each service decision point transparently directs client requests to the best performing server based on its in-built intelligence supported by real-time measurements from probes sent by the Netlet to each server. It is shown that the resulting system provides a client-side server selection solution which is server-customisable, scalable and fault transparent
Efficient Batch Update of Unique Identifiers in a Distributed Hash Table for Resources in a Mobile Host
Resources in a distributed system can be identified using identifiers based
on random numbers. When using a distributed hash table to resolve such
identifiers to network locations, the straightforward approach is to store the
network location directly in the hash table entry associated with an
identifier. When a mobile host contains a large number of resources, this
requires that all of the associated hash table entries must be updated when its
network address changes.
We propose an alternative approach where we store a host identifier in the
entry associated with a resource identifier and the actual network address of
the host in a separate host entry. This can drastically reduce the time
required for updating the distributed hash table when a mobile host changes its
network address. We also investigate under which circumstances our approach
should or should not be used. We evaluate and confirm the usefulness of our
approach with experiments run on top of OpenDHT.Comment: To be presented at the 2010 International Workshop on Cloud
Computing, Applications and Technologie
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