The Experts below are selected from a list of 8100 Experts worldwide ranked by ideXlab platform

Luca Foschini - One of the best experts on this subject based on the ideXlab platform.

  • IMS-Compliant management of vertical handoffs for mobile Multimedia Session continuity
    IEEE Communications Magazine, 2010
    Co-Authors: Paolo Bellavista, Antonio Corradi, Luca Foschini
    Abstract:

    The recent advances in wireless client devices and the crucial role of Multimedia communications in our society have motivated relevant standardization efforts, such as the IP Multimedia subsystem, to support Session control, mobility, and interoperability in all-IP next-generation networks. IMS has already driven the design of commercial mobile Multimedia, but exhibits limited support for service continuity during handoffs. In particular, it omits advanced techniques to reduce/eliminate handoff delays, especially during vertical handoffs (i.e., change of the wireless technology employed by a client to access the wired Internet, e.g., from UMTS to WiFi). We propose an original solution for Session continuity based on the primary design guideline of cleanly and effectively separating the signaling plane (for Session reconfiguration via SIP) from the media delivery plane (data transmission and related handoff management operations). Our optimized handoff management techniques exploit terminal-based decentralized predictions to minimize service-level handoff delays. Different from other recent related work, our proposal fully complies with the standard IMS infrastructure and works at the application level. The reported experimental results point out that our solution, available as an open source tool for the IMS community, reduces playout interruption times relevantly by introducing a limited and scalable signaling overhead.

Tasos Dagiuklas - One of the best experts on this subject based on the ideXlab platform.

  • A middleware architecture supporting seamless and secure Multimedia services across an intertechnology radio access network
    IEEE Wireless Communications, 2009
    Co-Authors: Jonathan Rodriguez, M. Tsagaropoulos, Stavros Kotsopoulos, Ilias Politis, Tasos Dagiuklas
    Abstract:

    This article presents a middleware architecture to support Multimedia services across intertechnology radio access networks in a secure and seamless manner. The proposed architecture uses the media-independent handover framework, where the handover decision function is based on triggering/collecting statistics from the physical, network, and application layers so that an ongoing Multimedia Session (video) can be transferred seamlessly and securely (using context transfer) across intertechnology radio access networks. Simulation results show that when a vertical handover is based on the proposed MIH framework (including the context transfer of AAA information), handover latency is reduced by 38 percent during WiFi to UMTS handover and 20 percent during UMTS to WiFi handover compared to a non-MIH-based handover scheme.

  • On the enhancement of mobility and Multimedia communications in heterogeneous RANs
    International Journal of Internet Protocol Technology, 2008
    Co-Authors: M. Georgiades, Klaus Moessner, Tasos Dagiuklas
    Abstract:

    Ambient Networks (AN) aim to embrace the heterogeneity arising from different network technologies such that it appears homogeneous to the potential users at the level of network service provisioning. This paper focuses on the employment of a State Transfer Module (STM) in AN for enhancing mobility and minimising the impact of Multimedia service discrepancy (e.g., security, Session continuity) by supporting the transfer of authentication and authorisation states upon handoff as well as supporting Multimedia Session continuation while the users roam and handoff across heterogeneous wireless networks.

  • IWCMC - Middlebox context transfer for Multimedia Session support in all-IP networks
    Proceeding of the 2006 international conference on Communications and mobile computing - IWCMC '06, 2006
    Co-Authors: M. Georgiades, Tasos Dagiuklas, Rahim Tafazolli
    Abstract:

    This paper describes a mechanism of forwarding secure state information associated to communication Sessions, between middleboxes belonging to different Radio Access Networks (RANs). The transfer of state information among RANs could support service integrity and continuity by maintaining a mobile user's Multimedia Sessions which may otherwise be dropped and also minimize security vulnerabilities. The paper demonstrates how the context transfer protocol could be employed for this purpose to forward certain security information from the old to the new middlebox to support Multimedia Session maintenance during mobility and also at the same time notify the previous middlebox to close unnecessary open ports for improved security and resolve vulnerability. A number of test scenarios are used to demonstrate how middleboxes could intervene with Multimedia Sessions during mobility and show how context transfer can provide a solution for improving the performance in the Multimedia Session re-establishment as well as enhancing middlebox security.

Paolo Bellavista - One of the best experts on this subject based on the ideXlab platform.

  • IMS-Compliant management of vertical handoffs for mobile Multimedia Session continuity
    IEEE Communications Magazine, 2010
    Co-Authors: Paolo Bellavista, Antonio Corradi, Luca Foschini
    Abstract:

    The recent advances in wireless client devices and the crucial role of Multimedia communications in our society have motivated relevant standardization efforts, such as the IP Multimedia subsystem, to support Session control, mobility, and interoperability in all-IP next-generation networks. IMS has already driven the design of commercial mobile Multimedia, but exhibits limited support for service continuity during handoffs. In particular, it omits advanced techniques to reduce/eliminate handoff delays, especially during vertical handoffs (i.e., change of the wireless technology employed by a client to access the wired Internet, e.g., from UMTS to WiFi). We propose an original solution for Session continuity based on the primary design guideline of cleanly and effectively separating the signaling plane (for Session reconfiguration via SIP) from the media delivery plane (data transmission and related handoff management operations). Our optimized handoff management techniques exploit terminal-based decentralized predictions to minimize service-level handoff delays. Different from other recent related work, our proposal fully complies with the standard IMS infrastructure and works at the application level. The reported experimental results point out that our solution, available as an open source tool for the IMS community, reduces playout interruption times relevantly by introducing a limited and scalable signaling overhead.

Henning Schulzrinne - One of the best experts on this subject based on the ideXlab platform.

  • Mechanisms for Media Source Selection in the Session Description Protocol (SDP)
    2012
    Co-Authors: Henning Schulzrinne, Jonathan Lennox
    Abstract:

    Source-Specific Media Attributes in the Session Description Protocol (SDP) provide a declarative mechanism by which endpoints can describe Real-Time Transport Protocol (RTP) sources within a media stream. This document extends that mechanism by defining mechanisms by which participants in a Multimedia Session can request specific sources from a remote party.

  • A Framework for the Usage of Internet Media Guides (IMGs)
    2006
    Co-Authors: Yuji Nomura, Henning Schulzrinne, Hitoshi Asaeda, Rod Walsh
    Abstract:

    This document defines a framework for the delivery of Internet Media Guides (IMGs). An IMG is a structured collection of Multimedia Session descriptions expressed using the Session Description Protocol (SDP), SDPng, or some similar Session description format. This document describes a generalized model for IMG delivery mechanisms, the use of existing protocols, and the need for additional work to create an IMG delivery infrastructure. This memo provides information for the Internet community.

  • An Offer/Answer Model with Session Description Protocol (SDP)
    2002
    Co-Authors: Jonathan Rosenberg, Henning Schulzrinne
    Abstract:

    This document defines a mechanism by which two entities can make use of the Session Description Protocol (SDP) to arrive at a common view of a Multimedia Session between them. In the model, one participant offers the other a description of the desired Session from their perspective, and the other participant answers with the desired Session from their perspective. This offer/answer model is most useful in unicast Sessions where information from both participants is needed for the complete view of the Session. The offer/answer model is used by protocols like the Session Initiation Protocol (SIP).

  • An Offer/Answer Model with SDP
    2001
    Co-Authors: Jonathan Rosenberg, Henning Schulzrinne
    Abstract:

    This document defines a mechanism by which two entities can make use of SDP arrive at a common view of a Multimedia Session between them. In the model, one participant offers the other a description of the desired Session from their perspective, and the other participant answers with the desired Session from their perspective. This offer/answer model is most useful in unicast Sessions where information from both participants is needed for the complete view of the Session. The offer/answer model is used by protocols like SIP.

  • A comprehensive Multimedia control architecture for the Internet
    Proceedings of 7th International Workshop on Network and Operating System Support for Digital Audio and Video (NOSSDAV '97), 1
    Co-Authors: Henning Schulzrinne
    Abstract:

    The Internet and intranets have been used to deliver continuous media, both stored and live, for a number of years. Most of the attention has focused on providing guaranteed quality of service (RSVP) and end-to-end data transport (RTP), with every application using its own control protocol. The author describe a control architecture that offers most standard advanced telephony features and integrates stored and conference Multimedia. The protocol re-uses much of the "infrastructure" of HTTP, including its security and proxy mechanisms. The architecture is instantiated by two related, but independent protocols: the Session Initiation Protocol (SIP) for inviting participants to a Multimedia Session and the Real-Time Stream Protocol (RTSP) to control playback and recording for stored continuous media.

Antonio Corradi - One of the best experts on this subject based on the ideXlab platform.

  • IMS-Compliant management of vertical handoffs for mobile Multimedia Session continuity
    IEEE Communications Magazine, 2010
    Co-Authors: Paolo Bellavista, Antonio Corradi, Luca Foschini
    Abstract:

    The recent advances in wireless client devices and the crucial role of Multimedia communications in our society have motivated relevant standardization efforts, such as the IP Multimedia subsystem, to support Session control, mobility, and interoperability in all-IP next-generation networks. IMS has already driven the design of commercial mobile Multimedia, but exhibits limited support for service continuity during handoffs. In particular, it omits advanced techniques to reduce/eliminate handoff delays, especially during vertical handoffs (i.e., change of the wireless technology employed by a client to access the wired Internet, e.g., from UMTS to WiFi). We propose an original solution for Session continuity based on the primary design guideline of cleanly and effectively separating the signaling plane (for Session reconfiguration via SIP) from the media delivery plane (data transmission and related handoff management operations). Our optimized handoff management techniques exploit terminal-based decentralized predictions to minimize service-level handoff delays. Different from other recent related work, our proposal fully complies with the standard IMS infrastructure and works at the application level. The reported experimental results point out that our solution, available as an open source tool for the IMS community, reduces playout interruption times relevantly by introducing a limited and scalable signaling overhead.