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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
321

Improving mobile IP handover latency on end-to -end TCP in UMTS/WCDMA networks

Lau, Chee Kong, Electrical Engineering & Telecommunications, Faculty of Engineering, UNSW January 2006 (has links)
Due to terminal mobility and change of service area, efficient IP mobility support is an important aspect in UMTS networks in order to provide mobile users negligible packet loss rate and low handover latency, and thus some level of guaranteed quality-ofservice (QoS) to support real-time applications. 3G/UMTS has been specified and implemented as an end-to-end mobile communications system. The underlying WCDMA access systems manage radio access handover (layer 1) and provide linklayer mobility (layer 2) in terms of connection setup and resource management. For the UMTS nodes to have seamless connectivity with the Internet, the UMTS core networks need to be able to support continuous and no network service session handover (layer 3 and above). A long IP handover latency results in high packet loss rate and severely degrades its end-to-end transport level performance. Network-layer handover latency has therefore been regarded as one of the fundamental limitations in IP-based UMTS networks. Therefore, it is crucial to provide efficient network-layer mobility management in UMTS/WCDMA networks for seamless end-to-end TCP connection with the global Internet. Mobility of UMTS nodes necessitates extra functionalities such as user location tracking, address registration and handover related mechanisms. The challenge to provide seamless mobility in UMTS requires localised location management and efficient IP handover management. Mobile IPv6 protocol offers a better mobility support as the extended IPv6 features with mobility mechanism are integrated to the mobile nodes. To mitigate the effect of lengthy IP handover latency, two well-known handover reducing mechanisms based on Mobile IPv6 support have been proposed in the literature. They are designed with hierarchical network management and address pre-configuration mechanism. Hierarchical management aims to reduce the network registration time, and fast-handover attempts to minimise the address resolution delay. S-MIP (Seamless Mobile IP) integrates the key benefits of the above IP mobility mechanisms coupled with local retransmission scheme to achieve packet lossless and extremely low handover latency, operating in WLAN environments. In this thesis, we explore the possible Mobile IP solutions and various IP handover optimisation schemes in IPv6 to provide seamless mobility in UMTS with the global Internet. It aims at developing an optimised handover scheme that encompasses the packet lossless and extremely low handover latency scheme in S-MIP, and applying it into the UMTS/WCDMA packet data domain. Therefore, the hybrid UMTS-SMIP architecture is able to meet the requirements of delay sensitive real-time applications requiring strict delay bound, packet lossless and low handover latency performance for end-to-end TCP connection during a UMTS IP-based handover. The overall seamless handover architecture in UMTS facilitates integrated, scalable and flexible global IP handover solution enabling new services, assuring service quality and meeting the user???s expectations in future all-IP UMTS deployment. The viability of the seamless mobility scheme in UMTS is reflected through and validated in our design model, network protocol implementation, and service architecture. We illustrate the performance gained in QoS parameters, as a result of converged UMTS-SMIP framework compared to other Mobile IPv6 variants. The simulation results show such a viable and promising seamless handover scheme in UMTS on IP handover latency reduction on its end-to-end TCP connection.
322

The evolution of global intellectual property instruments into trade related intellectual property rights (TRIPS) and its ineffective enforcement in developing world: a case study

Nasir, Saeed January 2008 (has links)
This thesis aims to critically evaluate global intellectual property instruments with detailed analysis of the Agreement on Trade-Related Intellectual Aspects of Property Rights (the TRIPS Agreement) provisions in order to investigate the enforcement issues, confronted by the Developing Countries due to fragile legal infrastructure. These intellectual property laws are evolutionary and designed to protect and honour human intellectual creations since BC 400 which recognized them distinct from divine inspirations. Italian Renaissance witnessed the systematic recognition of human skill, craft, innovation and invention. Venetian Government institutionalized it by awarding patents and copyrights to skilled workers and publishers. Its primary purpose was to protect the trade and secondary was to foster intellectual creativity through reward and recognition. These rewards and recognitions, known as Intellectual Property Rights (IPRs), developed with each new invention and creation. Industrial Revolution accelerated it and developed nations entered into international conventions to protect their nationals and their interests across the borders. In 1995, the Agreement on Trade-Related Aspects of Intellectual Property Rights (the TRIPS Agreement) accommodated all the previous (IPRs) instruments and its enforcement linked with global trade. It was a dilemma for developing nations who were desirous to participate in global trading system for their economic development but could not administer (IPRs) regimes on their land due to fragile and static infrastructure. All assistance from developed countries during the transitional period could not address the problems due to alien prescriptions, applied to counter problems in the developed World. Developing Nations need innovative, flexible and indigenous approach to administer the TRIPS Agreement. A case study of Pakistan judicial environment to address the TRIPS enforcement issue has been conducted. The methodological approach of this thesis is the interpretive paradigm of the qualitative research tradition. This interpretive paradigm or framework is applied through the two methodologies of hermeneutics and case study.
323

Formal specification of the TCP service and verification of TCP connection management

Han, Bing January 2004 (has links)
Using the approach of Coloured Petri nets (CPNs) and automata theory, this thesis shows how to formalise the service provided by the Transmission Control Protocol (TCP) and verify TCP Connection Management, an essential part of TCP. Most of the previous work on modelling and analysing TCP Connection Management is based on early versions of TCP, which are different from the current TCP specification. Also the scope is mainly confined to the connection establishment procedure, while the release procedure is either simplified or omitted from investigation. This thesis extends prior work by verifying a detailed model of TCP Connection Management. In defining the TCP service, the set of service primitives and their sequencing constraints are specified at each service access point. / thesis (PhDComputerSystemsEng)--University of South Australia, 2004.
324

Congestion control for multicast /

Ngo, Van Ngoc. January 2005 (has links)
Thesis (M.Sc.)--York University, 2005. Graduate Programme in Computer Science and Engineering. / Typescript. Includes bibliographical references (leaves 139-145). Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss &rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:MR11871
325

Internet protocol geolocation

Roehl, John M. January 1900 (has links)
Thesis (M.S.)--Air Force Institute of Technology, 2007. / AFIT/GIR/ENV/07-M15. Title from title page of PDF document (viewed on: Nov. 28, 2007). "March 2007." Includes bibliographical references (leaves 170-174).
326

Quantification, characterisation and impact evaluation of mobile IPv6 hand off times

Banh, Mai. January 2007 (has links)
Thesis (MEng) - Swinburne University of Technology, Centre for Advanced Internet Architectures, 2005. / [A thesis submitted in total fulfillment of the requirements of for the degree of ] Masters of Engineering by Research, Centre for Advanced Internet Architectures (CAIA), Faculty of Information and Communication Technologies, Swinburne University of Technology, 2005. Typescript. Bibliography p. 153-159.
327

Implementation of location detection, home agent discovery and registration of mobile IPv6 /

Xu, Yang, January 1900 (has links)
Thesis (M.C.S.)--Carleton University, 2001. / Includes bibliographical references (p. 77-79). Also available in electronic format on the Internet.
328

TCP over mobile ad-hoc access networks /

Moustafa, Ahmed January 1900 (has links)
Thesis (M.C.S.) - Carleton University, 2003. / Includes bibliographical references (p. 121-124). Also available in electronic format on the Internet.
329

TCP/IP networks with ECN over AQM /

Arora, Rakesh M. January 1900 (has links)
Thesis (M. Eng.)--Carleton University, 2003. / Includes bibliographical references (p. 99-101). Also available in electronic format on the Internet.
330

Transport layer fairness and congestion control in wireless ad hoc access networks /

Zhang, Hao, January 1900 (has links)
Thesis (M.App.Sc.) - Carleton University, 2006. / Includes bibliographical references (p. 106-110). Also available in electronic format on the Internet.

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