Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"Voice-over-IP (VoIP)"”.
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Design and evaluation of real-time Voice-Over-IP (VOIP) systems with high perceptual conversational quality
… focuses on the fundamental understanding of multiple quality aspects perceived and their trade-offs in the design of run-time control schemes that adapt to changing network conditions and expectations of the users of a system. One of the main contributions of this thesis is the use of adaptively …
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User generated content for IMS-based IPTV
… devices which are capable of performing multiple tasks. Due to this, services such as Voice over IP (VoIP), presence, social networks, instant messaging (IM) and Internet Protocol television (IPTV) to mention but a few, started to emerge...This thesis proposed a framework that will offer …
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Multimedia session continuity in the IP multimedia subsystem : investigation and testbed implementation
The advent of Internet Protocol (IP) based rich multimedia services and applications has seen rapid growth and adoption in recent years, with an equally increasing user base. Voice over IP (VoIP) and IP Television (IPTV) are key examples of services that are blurring the lines between traditional …
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Secure Voice over IP conferencing with decentralized group encryption
… the development of an end-to-end secure Voice over IP (VoIP) conference system. We are particularly interested in challenges associated with deploying such a system in ad-hoc networks containing low bandwidth and/or high latency data links. End-to-end security is handled by the …
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Evaluating Standard and Custom Applications in IPv6 Within a Simulation Framework
Internet Protocol version 6 (IPv6) is being adopted in networks around the world as the Internet Protocol version 4 (IPv4) addressing space reaches its maximum capacity. Although there are IPv6 applications being developed, there are not many production IPv6 networks in place in which these …
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Handoff management in the mobile wireless Internet
… handoff events. Real-time applications (e.g., Voice-Over-IP (VoIP), Video-Ondemand, and streaming) require little or no service disruptions during handoff because of their nature of being mostly delay-sensitive applications. The network must, therefore, offer minimal handoff delays, minimal …
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Coolhunting and Coolfarming : harnessing the power of collaborative innovation networks using social network analysis
Email, Instant Messaging, Voice Over IP (VOIP) and other means of online communication have become so ubiquitous today that we rarely take a moment to acknowledge how the internet has changed and redefined the ways in which we communicate and collaborate with fellow human beings. The internet has …
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Mobile Wireless System Interworking with 3G and Packet Aggregation for Wireless LAN
… a maximal quantity of data with minimal overhead. Our enhancement to IEEE 802.11, AGG-MAC yields dramatic improvements in both local and global throughput. It furthermore reduces jitter in support of real time communications requirements such as voice over IP (VoIP). In support of …
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Effective identities for trusted interactions in converged telecommunication systems
… communicate through landlines, mobile phones and Voice over IP (VoIP) phones. Unfortunately this convergence has resulted in easy manipulation of caller identity, resulting in both VoIP spam and Caller ID spoofing. In this dissertation, we introduce the notion of effective identity which is a …
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Improving the Quality of Real Time Media Applications through Sending the Best Packet Next
… packet and used in conjunction with the Round Trip Time (RTT) to determine whether packets are sent, and in which order that they are sent. For example, it has been shown that audio is more important to users than video in video conferencing. SBPN could be considered to be Quality of Service …
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Telemedicine Quality Improvement Study
… roots back to the early 1900s. The creation of Voice Over IP (VoIP) and synchronous communication allows individuals at two or more locations to communicate live in real-time, this is the margin that we use to develop and refine telemedicine technology at a reasonable cost. Success is measured …
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Design and Evaluation of Distributed Algorithms for Placement of Network Services
… as data caches for websites, servers for multiplayer games and relay nodes for Voice over IP: VoIP) conversations. While much research has focused on the design of such services, little attention has been focused on their actual placement. This placement can impact the quality of the service, …
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Aggregated service consolidation by multi-server virtualization
… process during the migration of a VM running a Voice over IP (VoIP) service from a source to target host residing on the same Local Area Network. The proposed design framework focused on modifying the pre-copy algorithm which is in charge of performing the live migration. The modifications …
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A two-layered mobility support architecture : fast mobile IPv6 and session initiation protocol
… objective of the study is to minimize the handover latency and packet lossduring any ongoing real-time communication by inter/intra domain mobility.Mobile IP (MIP) is a well-known network layer protocol that can support transparentmacromobility, and variants of the protocol such as Fast …
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The role of attention-deficit/hyperactivity disorder and parental misperceptions in risk for child physical abuse
Voice over IP (VoIP) is a key enabling technology for the migration of circuit-switched PSTN architectures to packet-based IP networks. However, this migration is successful only if the present problems in IP networks are addressed before deploying VoIP infrastructure on a large scale. One of the …
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System and Methods for Detecting Unwanted Voice Calls
Voice over IP (VoIP) is a key enabling technology for the migration of circuit-switched PSTN architectures to packet-based IP networks. However, this migration is successful only if the present problems in IP networks are addressed before deploying VoIP infrastructure on a large scale. One of the …
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Service oriented networking for multimedia applications in broadband wireless networks
… applications in broadband wireless networks. Moreover, the existing "access-oriented" networking solutions are not able to fully address all the issues of supporting various applications with different quality of service requirements. Thus, "service-oriented" networking has been recently proposed …
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Mobile IP movement detection optimisations in 802.11 wireless LANs
… mobile node moves from a wireless LAN on one IP network to a wireless LAN on a different network, an IP layer handoff occurs. During the handoff, the mobile node's IP settings must be updated in order to re-establish its IP connectivity at the new point of attachment. The Mobile IP protocol …
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Assessment of Voice Over IP as a solution for Voice over ADSL
Voice over DSL (VoDSL) is a technology that enables the transport of data and multiple voice calls over a single copper-pair. VoDSL employs packet voice technology instead of the traditional circuit switched voice. Voice over ATM (VoATM) and Voice over IP (VoIP) are the two main alternatives for …
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Virtualization of multicast services in WiMAX networks
… the interchange of service delivery between multiple networks with one shareable network infrastructure. Also, it should ensure efficient use of network resources and guarantee users' demands of Quality of Service (QoS). Thus, the design of virtualization of multicast service framework is a …
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