The Experts below are selected from a list of 4206 Experts worldwide ranked by ideXlab platform
Matthias Wählisch - One of the best experts on this subject based on the ideXlab platform.
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Fast adaptive routing supporting mobile senders in Source Specific Multicast
Telecommunication Systems, 2009Co-Authors: Thomas C. Schmidt, Matthias Wählisch, Maik WodarzAbstract:IP Multicast deployment recently progresses, but group services often remain restricted to limited domains and fail to comply with route-optimizing mobility management of the next generation Internet. Source Specific Multicast (SSM) facilitates transparent inter-domain routing and is expected to globally disseminate to many users and services. However, mobility support for Source Specific Multicast is still known to be a major open problem. In this paper, we propose the Enhanced Tree Morphing (ETM) protocol for extending SSM routing to mobile Multicast sources. The scheme dynamically adapts SSM forwarding states to sender mobility, and transforms (morphs) source Specific distribution trees into new, optimal trees rooted at a relocated source. ETM is simple, robust and secure, while it admits superior performance in packet forwarding at a low signaling overhead. Extensive evaluations based on a full protocol implementation, and simulations based on real-world topology data are performed, granting full insight into the properties of packet loss and delay stretch, protocol convergence times and router state evolution during single and rapidly repeated handovers. In a constant bit rate scenario, an ETM source handover typically leads to a slightly increasing delay of the first data packet, only. When operating on realistic network topologies, the protocol uniformly converges within less than 50 ms, thereby sustaining robustness under rapid source movement at all speeds common to our mobile world. Further optimizations are identified for FMIPv6 and for multihomed nodes.
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Towards seamless source mobility in SSM: design and evaluation of the Tree Morphing protocol
International Journal of Internet Protocol Technology, 2008Co-Authors: Olaf Christ, Thomas C. Schmidt, Matthias WählischAbstract:Multimedia networking in the near future is expected to be dominated by group applications such as IPTV. Driven by new services, Multicast at the network layer started to disseminate. Currently infotainment is expanding into the mobile world, but a standard design of mobile Multicast is still awaited. In this paper, we design and discuss the Tree Morphing (TM) protocol that adaptively manages trees to support seamless handovers for Source Specific Multicast (SSM) sources. Based on a full simulator implementation, we extensively explore its performance. By employing artificial networks, as well as real-world topologies, we analyse the handover behaviour conceptually and in realistic scenarios.
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Multicast Mobility in MIPv6: Problem Statement
2007Co-Authors: Matthias Wählisch, Thomas C. SchmidtAbstract:In this document we discuss mobility extensions to current IP layer Multicast solutions. Problems arising from mobile group communication in general, in the case of Multicast listener mobility and for mobile Any Source Multicast as well as Source Specific Multicast senders are documented. Characteristic aspects of Multicast routing and deployment issues are summarized. The principal approaches to the Multicast mobility problems are outlined subsequently.
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EUROMICRO-SEAA - A Light-Weight Implementation Scheme of the Tree Morphing Protocol for Mobile Multicast Sources
33rd EUROMICRO Conference on Software Engineering and Advanced Applications (EUROMICRO 2007), 2007Co-Authors: Olaf Christ, Thomas C. Schmidt, Matthias WählischAbstract:Multicast network services advantageously complement multimedia information and communication technologies, as they open up the realm for highly scalable multi- customer applications. Mobile environments providing shared limited bandwidth to a growing number of users will emphasize the need for Multicast support even further. The traditional Internet approach of Any Source Multicast (ASM) routing, though, remains hesitant to spread beyond limited, controlled environments. It is widely believed that simpler and more selective mechanisms for group distribution in Source Specific Multicast (SSM) will globally disseminate to many users of Multicast infrastructure and services. However, mobility support for Source Specific Multicast is still known to be a major open problem. This paper presents a light-weight, secure implementation of the Tree Morphing protocol on the IPv6 network layer. This distributed routing algorithm allows for a continuous adaptation of Multicast shortest path trees to source mobility. The approach introduced here is built upon standardized mobility signaling and includes strong authentication by means of cryptographically generated addresses. It neither requires definition of new protocol elements nor significant changes to the forwarding plane.
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A Hybrid Network Architecture for Mobile Multimedia Group Conferencing based on SIP Initiated SSM
2007 Second International Conference on Communications and Networking in China, 2007Co-Authors: Thomas C. Schmidt, Matthias Wählisch, Hans L. Cycon, Mark PalkowAbstract:There is a rising interest on SIP initiated multimedia communication. The main reason is that contrasted with H.323, SIP is an exceedingly simple protocol. Designed to be a general-purpose way to set up real-time IP based multimedia sessions between groups of participants, SIP can also be used to set up (mobile) multimedia Multicast meetings, conventionally by any source Multicast (ASM) routing. ASM however seems to be hesitant to disseminate. The simpler mechanisms for group distribution in source Specific Multicast (SSM) seems to be more acceptable to many users of Multicast infrastructure and services. SSM group session initiation up until now remains unsupported by the session initiation protocol (SIP).
Thomas C. Schmidt - One of the best experts on this subject based on the ideXlab platform.
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Fast adaptive routing supporting mobile senders in Source Specific Multicast
Telecommunication Systems, 2009Co-Authors: Thomas C. Schmidt, Matthias Wählisch, Maik WodarzAbstract:IP Multicast deployment recently progresses, but group services often remain restricted to limited domains and fail to comply with route-optimizing mobility management of the next generation Internet. Source Specific Multicast (SSM) facilitates transparent inter-domain routing and is expected to globally disseminate to many users and services. However, mobility support for Source Specific Multicast is still known to be a major open problem. In this paper, we propose the Enhanced Tree Morphing (ETM) protocol for extending SSM routing to mobile Multicast sources. The scheme dynamically adapts SSM forwarding states to sender mobility, and transforms (morphs) source Specific distribution trees into new, optimal trees rooted at a relocated source. ETM is simple, robust and secure, while it admits superior performance in packet forwarding at a low signaling overhead. Extensive evaluations based on a full protocol implementation, and simulations based on real-world topology data are performed, granting full insight into the properties of packet loss and delay stretch, protocol convergence times and router state evolution during single and rapidly repeated handovers. In a constant bit rate scenario, an ETM source handover typically leads to a slightly increasing delay of the first data packet, only. When operating on realistic network topologies, the protocol uniformly converges within less than 50 ms, thereby sustaining robustness under rapid source movement at all speeds common to our mobile world. Further optimizations are identified for FMIPv6 and for multihomed nodes.
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Towards seamless source mobility in SSM: design and evaluation of the Tree Morphing protocol
International Journal of Internet Protocol Technology, 2008Co-Authors: Olaf Christ, Thomas C. Schmidt, Matthias WählischAbstract:Multimedia networking in the near future is expected to be dominated by group applications such as IPTV. Driven by new services, Multicast at the network layer started to disseminate. Currently infotainment is expanding into the mobile world, but a standard design of mobile Multicast is still awaited. In this paper, we design and discuss the Tree Morphing (TM) protocol that adaptively manages trees to support seamless handovers for Source Specific Multicast (SSM) sources. Based on a full simulator implementation, we extensively explore its performance. By employing artificial networks, as well as real-world topologies, we analyse the handover behaviour conceptually and in realistic scenarios.
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Multicast Mobility in MIPv6: Problem Statement
2007Co-Authors: Matthias Wählisch, Thomas C. SchmidtAbstract:In this document we discuss mobility extensions to current IP layer Multicast solutions. Problems arising from mobile group communication in general, in the case of Multicast listener mobility and for mobile Any Source Multicast as well as Source Specific Multicast senders are documented. Characteristic aspects of Multicast routing and deployment issues are summarized. The principal approaches to the Multicast mobility problems are outlined subsequently.
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EUROMICRO-SEAA - A Light-Weight Implementation Scheme of the Tree Morphing Protocol for Mobile Multicast Sources
33rd EUROMICRO Conference on Software Engineering and Advanced Applications (EUROMICRO 2007), 2007Co-Authors: Olaf Christ, Thomas C. Schmidt, Matthias WählischAbstract:Multicast network services advantageously complement multimedia information and communication technologies, as they open up the realm for highly scalable multi- customer applications. Mobile environments providing shared limited bandwidth to a growing number of users will emphasize the need for Multicast support even further. The traditional Internet approach of Any Source Multicast (ASM) routing, though, remains hesitant to spread beyond limited, controlled environments. It is widely believed that simpler and more selective mechanisms for group distribution in Source Specific Multicast (SSM) will globally disseminate to many users of Multicast infrastructure and services. However, mobility support for Source Specific Multicast is still known to be a major open problem. This paper presents a light-weight, secure implementation of the Tree Morphing protocol on the IPv6 network layer. This distributed routing algorithm allows for a continuous adaptation of Multicast shortest path trees to source mobility. The approach introduced here is built upon standardized mobility signaling and includes strong authentication by means of cryptographically generated addresses. It neither requires definition of new protocol elements nor significant changes to the forwarding plane.
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A Hybrid Network Architecture for Mobile Multimedia Group Conferencing based on SIP Initiated SSM
2007 Second International Conference on Communications and Networking in China, 2007Co-Authors: Thomas C. Schmidt, Matthias Wählisch, Hans L. Cycon, Mark PalkowAbstract:There is a rising interest on SIP initiated multimedia communication. The main reason is that contrasted with H.323, SIP is an exceedingly simple protocol. Designed to be a general-purpose way to set up real-time IP based multimedia sessions between groups of participants, SIP can also be used to set up (mobile) multimedia Multicast meetings, conventionally by any source Multicast (ASM) routing. ASM however seems to be hesitant to disseminate. The simpler mechanisms for group distribution in source Specific Multicast (SSM) seems to be more acceptable to many users of Multicast infrastructure and services. SSM group session initiation up until now remains unsupported by the session initiation protocol (SIP).
Ajaz Hussain Mir - One of the best experts on this subject based on the ideXlab platform.
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performance analysis of source Specific Multicast over internet protocol version 6 with internet protocol version 4 in a test bed
Consumer Communications and Networking Conference, 2013Co-Authors: Mohammad Ahsan Chishti, Ashaq Majid Ahanger, Shaima Qureshi, Ajaz Hussain MirAbstract:Internet Protocol (IP) Multicast offers a scalable multipoint delivery necessary for multimedia communication on the Internet. Source Specific Multicast has been seen as a scalable solution for the implementation of Multicast in networks. Performance analysis of Source Specific Multicast based on various network performance metrics such as bandwidth, delay, jitter and throughput was carried out over IPv6 and IPv4 networks. IPv6 Source Specific Multicast exhibits good performance in terms of throughput than its counterpart IPv4 Source Specific Multicast. After evaluation of this improved streaming technology, it was seen that there is still scope of improvement in IPv6 SSM performance by parameters including bandwidth, delay and jitter.
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CCNC - Performance analysis of Source Specific Multicast over Internet Protocol version 6 with Internet Protocol version 4 in a test bed
2013 IEEE 10th Consumer Communications and Networking Conference (CCNC), 2013Co-Authors: Mohammad Ahsan Chishti, Ashaq Majid Ahanger, Shaima Qureshi, Ajaz Hussain MirAbstract:Internet Protocol (IP) Multicast offers a scalable multipoint delivery necessary for multimedia communication on the Internet. Source Specific Multicast has been seen as a scalable solution for the implementation of Multicast in networks. Performance analysis of Source Specific Multicast based on various network performance metrics such as bandwidth, delay, jitter and throughput was carried out over IPv6 and IPv4 networks. IPv6 Source Specific Multicast exhibits good performance in terms of throughput than its counterpart IPv4 Source Specific Multicast. After evaluation of this improved streaming technology, it was seen that there is still scope of improvement in IPv6 SSM performance by parameters including bandwidth, delay and jitter.
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Implementation of Source Specific Multicast (SSM) in a test bed over Internet Protocol version 6 (IPv6)
2008 2nd International Conference on Internet Multimedia Services Architecture and Applications, 2008Co-Authors: Mohammad Ahsan Chishti, Shaima Qureshi, Ajaz Hussain MirAbstract:Internet Protocol version 6 (IPv6) and Multicast are two technologies which are expected to gain huge significance in the future. Multicasting is a technique which allows a single transmission to be sent to multiple hosts anywhere on the Internet providing efficient delivery for streaming audio and video content and IPv6 adds a unique and much larger IP address space, provides improved security, efficient routing, support for mobile and an increased number of Multicast addresses. Source Specific Multicast (SSM) is a technique of delivering Multicast packets in which the only packets that are delivered to a receiver are those originating from a Specific source address requested by the receiver. This paper gives an approach of how to construct a source Specific Multicast test bed over Internet Protocol version 6 and various issues related to the configuration and deployment would be dealt with, in addition to the experience that we had in its implementation and testing. It would involve the fundamentals of source Specific Multicast, the preparation of a FreeBSD machine as a Multicast router, the installation of the PIM-SM daemon (pim6sd) on FreeBSD, the configuration of the network, streaming video over the SSM IPv6 network and finally discussing some issues in deploying the network.
Edmundo Monteiro - One of the best experts on this subject based on the ideXlab platform.
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evaluation of an overlay for source Specific Multicast in asymmetric routing environments
Global Communications Conference, 2007Co-Authors: Vasco Pereira, Edmundo Monteiro, Paulo MendesAbstract:Multicast routing is again gaining popularity with the development of new group services, like real-time multimedia streaming. The aim is to reach big groups of users with the quality level they expect, while using network resources in an efficient way. This is a challenge to be fulfilled as current Multicast protocols still have difficulties in dealing with basic issues like asymmetric routing. In this work we describe and evaluate an overlay that allows the use of the source-Specific Multicast standard in environments with asymmetric routing. A set of tests is made in the data and control plane, to expose the pros and cons of this new proposal.
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GLOBECOM - Evaluation of an Overlay for Source-Specific Multicast in Asymmetric Routing Environments
IEEE GLOBECOM 2007-2007 IEEE Global Telecommunications Conference, 2007Co-Authors: Vasco Pereira, Edmundo Monteiro, Paulo MendesAbstract:Multicast routing is again gaining popularity with the development of new group services, like real-time multimedia streaming. The aim is to reach big groups of users with the quality level they expect, while using network resources in an efficient way. This is a challenge to be fulfilled as current Multicast protocols still have difficulties in dealing with basic issues like asymmetric routing. In this work we describe and evaluate an overlay that allows the use of the source-Specific Multicast standard in environments with asymmetric routing. A set of tests is made in the data and control plane, to expose the pros and cons of this new proposal.
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experimental evaluation of the source Specific Multicast model in mobile environments
World of Wireless Mobile and Multimedia Networks, 2006Co-Authors: Tiago Sousa, Paulo Mendes, Edmundo MonteiroAbstract:Although the single source Multicast model is quite mature, the implementation of its protocols became available only very recently and experimental results to evaluate this model are still missing, specially in mobile environments. Hence, our goal is to experimentally evaluate the single source Multicast model against the two Multicast mobility proposals of the IETF: remote subscription and bi-directional tunneling techniques. We experimentally confirm that the group management query, in remote subscription, and the router advertisement interval, in bi-directional tunneling are unacceptably high and not adjusted for mobile environments. The handover latency of both techniques is closely related with those intervals. Other results show that both techniques have similar throughput and packet loss in home network, having the remote subscription higher throughput in remote access networks. This throughput decrease in remote access networks reveals one of the drawbacks of the bidirectional tunneling technique: the non-optimal routing. Its was also concluded that RFC 3810 is not prepared to deal with mobile environments.
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WOWMOM - Experimental evaluation of the source Specific Multicast model in mobile environments
2006 International Symposium on a World of Wireless Mobile and Multimedia Networks(WoWMoM'06), 1Co-Authors: Tiago Sousa, Paulo Mendes, Edmundo MonteiroAbstract:Although the single source Multicast model is quite mature, the implementation of its protocols became available only very recently and experimental results to evaluate this model are still missing, specially in mobile environments. Hence, our goal is to experimentally evaluate the single source Multicast model against the two Multicast mobility proposals of the IETF: remote subscription and bi-directional tunneling techniques. We experimentally confirm that the group management query, in remote subscription, and the router advertisement interval, in bi-directional tunneling are unacceptably high and not adjusted for mobile environments. The handover latency of both techniques is closely related with those intervals. Other results show that both techniques have similar throughput and packet loss in home network, having the remote subscription higher throughput in remote access networks. This throughput decrease in remote access networks reveals one of the drawbacks of the bidirectional tunneling technique: the non-optimal routing. Its was also concluded that RFC 3810 is not prepared to deal with mobile environments.
Chen Xue - One of the best experts on this subject based on the ideXlab platform.
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Source-Specific Multicast Scheme for Ethernet Switch
Computer Engineering, 2009Co-Authors: Chen XueAbstract:Aiming at the problem that Multicast data forwarding efficiency on edge network is not high enough,this paper proposes a source-Specific Multicast scheme for Ethernet switch. The Multicast data of Specific source is forwarded by snooping the IGMPv3 message. This paper describes the operation mechanism of management flow and data flow,simulates and analyzes the mechanism. Comparison results with the IGMPv2 snooping scheme show that this scheme has higher efficiency.
