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- Abu-Lebdeh, Mohammad, et al.
(författare)
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Cloudifying the 3GPP IP Multimedia Subsystem for 4G and Beyond : A Survey
- 2016
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Ingår i: IEEE Communications Magazine. - : IEEE conference proceedings. - 0163-6804 .- 1558-1896. ; 54:1, s. 91-97
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Tidskriftsartikel (refereegranskat)abstract
- 4G systems have been continuously evolving to cope with the emerging challenges of human-centric and M2M applications. Research has also now started on 5G systems. Scenarios have been proposed and initial requirements derived. 4G and beyond systems are expected to easily deliver a wide range of human-centric and M2M applications and services in a scalable, elastic, and cost-efficient manner. The 3GPP IMS was standardized as the service delivery platform for 3G networks. Unfortunately, it does not meet several requirements for provisioning applications and services in 4G and beyond systems. However, cloudifying it will certainly pave the way for its use as a service delivery platform for 4G and beyond. This article presents a critical overview of the architectures proposed so far for cloudifying the IMS. There are two classes of approaches; the first focuses on the whole IMS system, and the second deals with specific IMS entities. Research directions are also discussed. IMS granularity and a PaaS for the development and management of IMS functional entities are the two key directions we currently foresee.
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| 2. |
- Fu, C., et al.
(författare)
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A cross-layer architecture for signaling in multihop cellular networks
- 2008
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Ingår i: IEEE Communications Magazine. - 0163-6804 .- 1558-1896. ; 46:9, s. 174-182
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Tidskriftsartikel (refereegranskat)abstract
- Multihop cellular networks (MCNs) combine traditional single-hop cellular networks with ad hoc networks. They have emerged recently as an active research topic due to their throughput advantages and low cost. Most of the research on MCNs has been focused on lower-layer issues such as routing. Application layer issues in MCNs are seldom addressed. In this article we tackle one of these issues: signaling for conferencing. Conferencing enables a range of "killer" applications such as videoconferencing, gaming, and distance learning. Signaling is a critical component that handles session initiation, modification, and termination. We have proposed a general signaling architecture for integrated 3G/MANETs that is applicable to the specific case of MCNs. This architecture is based on application- layer clusters and faces several performance drawbacks. This article focuses on optimizing the architecture performance for the specific environment of an MCN. We first present this MCN environment and discuss conferencing scenarios. We propose an optimization architecture based on cross-layer design, which is then compared to the existing proposals, followed by a set of optimization schemes. The article also discusses initial evaluation results.
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| 3. |
- Glitho, Roch H., 1958-
(författare)
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A Mobile Agent Based Service Architecture for Internet Telephony
- 2002
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Internet Telephony defined as real time voice or multimediacommunications over packet switched networks dates back to theearly days of the Internet. ARPA's Network SecureCommunications project had implemented, as early as December1973, an infrastructure for local and transnet real time voicecommunication. Two main sets of standards have emerged: H. 323from the ITU-T and the session initiation protocol (SIP) fromthe Internet Engineering Task Force (IETF). Both includespecifications for value added services. Value added services,or more simply services, are critical to service providers'survival and success. Unfortunately, the service architecturesthat come with the ITU-T and the IETF sets of standards arerather weak. Although they are constantly evolving,alternatives and complements need to be researched. This thesiswhich is made up of a formal dissertation and 6 appendices,proposes a novel mobile agent based service architecture forInternet Telephony. The architecture addresses the issues noneof the existing architectures solves in a satisfactory manner.Furthermore it adds mobile agents to the panoply of servicecreation tools. The appendices are reprints of articlespublished in refereed magazines/journals or under considerationfor publication. The formal dissertation is a summary of thepublications. A consistent and comprehensive set ofrequirements are derived. They are TINA-C flavored, but adaptedto Internet Telephony. They are used to critically reviewrelated work and also used to motivate the use of mobile agentsas the pillars of a novel architecture. The components of thisnovel architecture are identified. The key component is themobile service agent. It acts as a folder and carriesservice(s) to which the end-user has subscribed. Mobile serviceagents need to be upgraded when new versions of service logicare available and when end-users make changes to service data.This thesis proposes a novel upgrading framework. The currentInternet infrastructure comprises a wide range of hosts. Mobileagent platforms are now available for most of thesehosts/clients including memory/processing power constrainedPDAs. Our mobile service agents need to adapt to hostvariability when roaming. A novel adaptivity framework is alsoproposed. These two frameworks are general and can be appliedto any other mobile agent which meets a basic set ofassumptions. A key advantage of a mobile agent based servicearchitecture is that it enables the developement of mobileagent based services. The thesis proposes a novel mobile agentbased multi-party session scheduler. The feasibility and theadvantages of the architecture proposed by this thesis havebeen demonstrated by a prototype on which measurements havebeen made. Future work includes the addition of a securityframework to the architecture, and refinenements to theupgrading and adaptivity frameworks. More mobile agent basedservices, especially mobile multi agent based services willalso be developed.
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| 4. |
- Karmouch, Ahmed, et al.
(författare)
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Contextware Research Challenges in Ambient Networks
- 2004
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Ingår i: IEEE MATA 2004 1st International Workshop on Mobility Aware Technologies and Applications 20-22 October 2004, Florianopolis, Brazil - www.ic.unicamp.br/mata04. - : Springer. - 3540234233
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Konferensbidrag (refereegranskat)
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| 5. |
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| 6. |
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| 7. |
- Walters, Jamie, 1982-
(författare)
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Distributed Immersive Participation : Realising Multi-Criteria Context-Centric Relationships on an Internet of Things
- 2014
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Advances in Internet-of-Things integrate sensors and actuators in everyday items or even people transforming our society at an accelerated pace. This occurs in areas such as agriculture, logistics, transport, healthcare, and smart cities and has created new ways to interact with and experience entertainment, (serious) games, education, etc. Common to these domains is the challenge to realize and maintain complex relations with any object or individual globally, with the requirement for immediacy in maintaining relations of varying complexity. Existing architectures for maintaining relations on the Internet, e.g., DNS and search engines are insufficient in meeting these challenges. Their deficiencies mandate the research presented in this dissertation enabling the maintenance of dynamic and multi-criteria relationships among entities in real-time in an Internet-of-Things while minimizing the overall cost for maintaining such context-centric relationships. A second challenge is the need to represent nearness in context-centric relationships, since solutions need to build on what is closely related.The dissertation shows that the proximity on relations can be used to bring about the scalability of maintaining relationships across the IoT. It successfully demonstrates the concept and feasibility of self-organizing context-centric overlay networks for maintaining scalable and real-time relationships between endpoints co-located with associated physical entities. This is complemented by an object model for annotating objects and their relationships as derived and defined over the underpinning context interactions. Complementing measures of nearness are added through a non-metric multi-criteria approach to evaluating the notion of context proximity. A query language and an extension to the publish-subscribe approaches achieves distributed support for discovering such relationships; locating entities relative to a defined hyper-sphere of interest. Furthermore, it introduces adaptive algorithms for maintaining such relationships at minimal overall costs. The results demonstrate the feasibility of moving towards context-centric approaches to immersion and that such approaches are realizable over vast and distributed heterogeneous collections of user and their associated context information.
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