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Asante, Michael. "Mobile IP convergence to empower multimedia traffic anywhere". Thesis, University of Reading, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.493931.
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The mobile workforce needs the ability to communicate with customers, partners, and fellow workers anywhere, anytime and get access to relevant business applications and tools to carry out business effectively and with this the Transmission Control Protocol / Internet Protocol (TCP/IP) plays a major part. The TCP/IP which forms the main platform for networking and how data packets are handled by the Internet fits well within the OSI model which consists of the physical layer, data link layer, network layer, transport layer, session layer, presentation layer and the application layer.
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Herzhoff, Jan Dirk. "Unfolding the convergence paradox : the case of mobile voice-over-IP in the UK". Thesis, London School of Economics and Political Science (University of London), 2010. http://etheses.lse.ac.uk/2390/.
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The notion of digital and in particular Information and Communication Technology (ICT) convergence has, over the past 40 years, been in the centre of many technological discourses in different functional systems of society: from the economic and mass media to the legal and political systems. Recently, a new convergence discourse has emerged around next-generation wireless infrastructures and services. One manifestation can be seen in discussion of the mobile Internet, and in particular of new converging services connecting mobile telephony networks to the Internet. Contrary to the prominence of the topic in other domains, the Information Systems community has relegated the notion of ICT convergence to the sidelines. Only recently have there been calls to include convergence as one of the drivers for the design of new mobile infrastructures and services. However, a systematic analysis of the idea of ICT convergence is still missing. Thus, based on an extensive literature review, this dissertation aims firstly to understand if there is space for a more theoretical development of this concept in the information infrastructure literature. Secondly, it provides an initial conceptual clarification of the ICT convergence discourse. Thirdly, it suggests a systems-theoretical unfolding of the identified core distinction between convergence and divergence, namely the convergence paradox. Finally, the role of technology in these discourses is examined. This dissertation analyses the notion of convergence and provides a systems-theoretical understanding of its dynamics from a second-order cybernetics perspective. The theoretical framework of this study is based on Niklas Luhmann's Theory of Social Systems. More specifically, it uses analytical strategies based on the work by Nils A. Andersen to understand the characteristics of convergence, eventually to unfold the convergence paradox. The empirical study investigates the convergence discourses around mobile Voice-over-IP in the UK from 2000-2009. The corpus of data encompasses 39 semi-structured interviews with telecommunications experts in the field of mobile VoIP, a wide range of documents, and direct observations from practitioners' conferences. The empirical study has been part of the EPSRC / Mobile VCE Core-5 Flexible Networks Project. This dissertation contributes to the broad multi-disciplinary literature of studies dealing with the phenomenon of ICT convergence, more specifically to that on information infrastructures. It develops a conceptual clarification of the notion of convergence. The findings of this dissertation suggest seeing convergence as a difference-reduction programme. This conceptualisation has the following consequences. Firstly, it suggests that convergence is observer-dependent. Secondly, it suggests that its counter-concept is not divergence or fragmentation but rather the maintenance of difference, i.e. control. Thirdly, it suggests that convergence has to deal with the typical unintended consequences inherent in difference-reduction programmes. Furthermore, while ICT convergence treated as difference-reduction programme challenges the existing identity of the infrastructure, the primary role of control is to maintain this difference. The dynamics between these two operations seem to lead to the emergence of further fragmentation.
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Suikki, R. (Raija). "Changing business environment—effects of continuous innovations and disruptive technologies". Doctoral thesis, University of Oulu, 2007. http://urn.fi/urn:isbn:9789514283437.
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Abstract
Today's turbulent business environment, which is characterised by uncertainty and inability to predict the future, is extremely challenging. Mobile and Internet Protocol (IP) convergence, which brings together technologies and services from the mobile and Internet domains, has been identified as a discontinuity in the mobile telecommunications business. Additionally, new disruptive technologies are introduced together with new, complex products.
This research addresses the approach that, along with introducing disruptive technologies in the mobile and IP convergence era, a new operational mode is needed in the new product development (NPD) process. This study approaches the operational mode from five perspectives: business environment, competence development, process renewal, running technology pilots, and product reliability.
The research on the business environment area proposes two frameworks: one for building and describing and another for evaluating business models. The study on competence development arrives at the conclusion to propose a project management competence development framework. The third research perspective suggests that, when the business environment is changing, and disruptive technologies and continuous innovations create new kinds of products, it is likely that processes need renewal. Running technology pilots to involve customers early enough in new product development is proposed in the fourth research area. Finally, the fifth research topic proposes that it is essential for companies to be able to estimate the reliability of their products during the product development phase.
It is concluded that the new operational mode when introducing disruptive technologies requires reconsidering business models, special attention to competence development, process renewal, customer involvement in new product development, and requires a means to guarantee software reliability.
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Pérez, Costa Xavier. "Toward All-IP networks : IP and wireless networks convergence". Doctoral thesis, Universitat Politècnica de Catalunya, 2005. http://hdl.handle.net/10803/7051.
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In this thesis the state of the art for IP networks and the two most predominant wireless access networks, UMTS and Wireless LANs, has been reviewed with respect to the enhancements required toward the objective of supporting services across different network technologies in a seamless manner. Three main areas of research were identified as key in the path toward All-IP networks: i) IP-based mobility management, ii) IP-based UMTS Radio Access Networks and iii) QoS for Wireless LANs.Future All-IP networks require of an IP-based mobility management protocol to support mobility across heterogeneous networks. Several protocols are being proposed in the IETF for this purpose with Mobile IPv6, Hierarchical Mobile IPv6 and Fast Handovers for Mobile IPv6 being the ones with a higher acceptance. Our contribution in this area has been the thorough study of the performance enhancements provided by each protocol and their associated costs in realistic scenarios to support the design process of Mobile IPv6-based networks where the suitability of the different options has to be evaluated. In addition, we proposed a combination of Hierarchical Mobile IPv6 and Fast Handovers for Mobile IPv6, based on the description provided in the Hierarchical Mobile IPv6 draft, that aims to outperform both proposals by adding the advantages of each of them.
During the evaluation of the IP-based mobility management protocols, the mobility model influence over the performance results led to an additional line of study where the main characteristics of the Random Waypoint mobility model were analyzed. The random waypoint model is a commonly used mobility model for simulations of wireless communication networks. We gave a formal description of this model in terms of a discrete- time stochastic process which provides a deep understanding on the characteristics of the mobility created by its usage. The results of our work are of practical value for performance analysis of communication networks to avoid misinterpretation of simulation results.
UMTS networks being deployed today based on the Release'99 specifications use ATM transport in the Radio Access Network (RAN). The specifications for future releases include options to support IP transport in the RAN, however, several challenges are introduced with regard to a significant increase in the transport protocol overhead and the provision of QoS guarantees. These challenges have to be addressed to ensure an efficient usage of the scarce RAN resources. Our work focused first in reducing the resources needed in the air interface for the expected most relevant application in future 3G networks, Voice over IP (VoIP). We designed a radio access bearer for VoIP when Robust Header Compression (RoHC) is used that reduces in about 50% the resources required in the air interface. Then, a multiplexing scheme for the reduction of the overhead in the wired part of the RAN that allows QoS differentiated scheduling was described and evaluated. The results showed an increase in the efficiency of the RAN resources usage between 100% and 260%, in our scenarios, when combined with RoHC. Finally, we proposed and evaluated a QoS differentiated scheduling mechanism based on Earliest-Deadline-First that fulfills the RAN specific synchronization requirements while providing the QoS differentiation required by the applications.
The IEEE 802.11 standard presents relevant defficiencies in order to support applications with QoS requirements. The integration of the Wireless LAN technology in future All-IP networks heavily depends on the success of the upcoming 802.11e standard which extends the 802.11MAC layer to provide QoS guarantees. With our work in this area we contributed to the 802.11e research standardization effort and designed three extensions of the 802.11 MAC layer to provide delay guarantees (DIME-EF) and bandwidth guarantees, absolute (ARME) or relative (DWFQ).
Moreover, we analyzed the implications of introducing Wireless LAN capabilities in battery limited mobile devices as for example cellular phones. Based on the significant impact observed of the 802.11 power save mode over the 802.11e QoS mechanisms we designed and evaluated a solution that provides a soft upper bound of the data frames downlink delay according to the downlink frame interarrival time while minimizing the battery consumption. Part of this work has been used for the design and configuration of the NEC 3G/WLAN mobile terminal N900iL.
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Abad, Caballero Israel Manuel. "Secure Mobile Voice over IP". Thesis, KTH, Mikroelektronik och Informationsteknik, IMIT, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-93113.
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Voice over IP (VoIP) can be defined as the ability to make phone calls and to send faxes (i.e., to do everything we can do today with the Public Switched Telephone Network, PSTN) over IP−based data networks with a suitable quality of service and potentially a superior cost/benefit ratio. There is a desire to provide (VoIP) with the suitable security without effecting the performance of this technology. This becomes even more important when VoIP utilizes wireless technologies as the data networks (such as Wireless Local Area Networks, WLAN), given the bandwidth and other constraints of wireless environments, and the data processing costs of the security mechanisms. As for many other (secure) applications, we should consider the security in Mobile VoIP as a chain, where every link, from the secure establishment to the secure termination of a call, must be secure in order to maintain the security of the entire process. This document presents a solution to these issues, providing a secure model for Mobile VoIP that minimizes the processing costs and the bandwidth consumption. This is mainly achieved by making use of high− throughput, low packet expansion security protocols (such as the Secure Real−Time Protocol, SRTP); and high−speed encryption algorithms (such as the Advanced Encryption Standard, AES). In the thesis I describe in detail the problem and its alternative solutions. I also describe in detail the selected solution and the protocols and mechanisms this solution utilizes, such as the Transport Layer Security (TLS) for securing the Session Initiation Protocol (SIP), the Real−Time Protocol (RTP) profile Secure Real−Time Protocol (SRTP) for securing the media data transport , and the Multimedia Internet KEYing (MIKEY) as the key−management protocol. Moreover, an implementation of SRTP, called MINIsrtp, is also provided. The oral presentation will provide an overview of these topics, with an in depth examination of those parts which were the most significant or unexpectedly difficult. Regarding my implementation, evaluation, and testing of the model, this project in mainly focused on the security for the media stream (SRTP). However, thorough theoretical work has also been performed and will be presented, which includes other aspects, such as the establishment and termination of the call (using SIP) and the key−management protocol (MIKEY).Voice over IP (VoIP) kan defineras som förmågan att göra ett telefonsamtal och att skicka fax (eller att göraallting som man idag kan göra över det publika telefonnätet) över ett IP−baserat nätverk med en passande kvalitet och till lägre kostnad, alternativt större nytta. VoIP måste tillhandahållas med nödvändiga säkerhetstjänster utan att teknikens prestanta påverkas. Detta blir allt viktigare när VoIP används över trådlösa länktekniker (såsom trådlösa lokala nätverk, WLAN), givet dessa länkars begränsade bandbredd och den bearbetningkraft som krävs för att exekvera säkerhetsmekanismerna. Vi måste tänka på VoIPs säkerhet likt en kedja där inte någon länk, från säker uppkoppling till säker nedkoppling, får fallera för att erhålla en säker process. I detta dokument presenteras en lösning på detta problem och innefattar en säker modell för Mobile VoIP som minimerar bearbetningskostnaderna och bandbreddsutnyttjandet. Detta erhålls huvudsakligen genom utnyttjande av säkerhetsprotokoll med hög genomströmning och låg paketexpansion, såsom "Secure Real− time Protocol" (SRTP), och av krypteringsprotokoll med hög hastighet, såsom "Advanced Encryption Standard" (AES). I detta dokument beskriver jag problemet och dess alternativa lösningar. Jag beskriver också den valda lösningen och dess protokoll och mekanismer mer detaljerat, till exempel "Transport Layer Security" (TLS) för att säkra "Session Initiation Protocol" (SIP), SRTP för att skydda transporten av data och "Multimedia Internet KEYing" (MIKEY) för nyckelhantering. En implementation av SRTP, kallad MINIsrtp, finns också beskriven. Beträffande praktiskt arbete och tester av lösningsmodellen har detta projekt fokuserats på skyddandet av datatransporten (SRTP), dess implementation och prestanda. Emellertid har en grundlig teoretisk undersökning genomförts, vilken innefattar andra aspekter såsom telefonsamtalets uppkoppling och nedkoppling (med hjälp av SIP) och valet av passande nyckelhanteringsprotokoll (MIKEY) för att stödja SRTP.
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Falade, Olumuyiwa, e Marcellus Botsio. "Mobile IP Handover for WLAN". Thesis, Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-4903.
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The past few years have seen great increases in the use of portable devices like laptops, palmtops, etc. This has also led to the dramatic increase demand on wireless local area networks (WLAN) due to the flexibility and ease of use that it offers. Mobile IP and handover are important issues to be considered as these devices move within and between different networks and still have to maintain connectivity. It is, therefore, imperative to ensure seamless mobile IP handover for these devices as they move about.
In this thesis we undertake a survey to describe the real processes involved in mobile IP handover in WLAN environment for different scenarios. Our work also identifies individual sources of delay during the handoff process, the sum total of which makes up the total latency. Other factors that could militate against the aim of having a seamless handoff in an inter-subnet network roaming were also considered as well as some proposed solutions. These factors are security, packet loss and triangle routing.
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Sargeant, Anthony. "Performance evaluation of mobile IP /". Leeds : University of Leeds, School of Computer Studies, 2008. http://www.comp.leeds.ac.uk/fyproj/reports/0708/Sargeant.pdf.
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Raška, Martin. "Mobile IP v sítích MANET". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-218096.
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This thesis discuss about the problem with mobility of stations in IP networks, concretely protocol Mobile IP and about the problems with this protocol in MANET networks, with the scope on Motorola MESH. First part is about design integration of protocol Mobile IP in this networks with usage Tropos 5210 MetroMesh routers and Cisco components (router, switch) to design and configure wireless MESH network, than connect this network with Cisco components and try to implement Mobile IP into this network. Second part is about design and configure wireless network from Cisco Wireless Access Points and about succesfully implementation of Mobile IP protocol into this network. In the last part is some tests of the function and quality of this topology.
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Alkhawaja, Abdel Rahman, e Hatem Sheibani. "Security issues with Mobile IP". Thesis, Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-14582.
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With a rapid growth in wireless technology in recent years, Mobile IP has become very important for consumers and businesses by providing mobility based on IP addresses using several applications, which keep the employees connected with each others with critical information. In mobile IP the node can change its location by maintaining the same IP address and keep connected to the internet, which solves the issue of terminating the communication once it moves. Since Mobile IP uses open airwaves as a transmission medium, it is subject to the many security threats that are routed in mobile IP network .Protecting mobile IP from threats and attacks is one of the most challenging task now days. IPSec is a standard security protocol solution for TCP/IP network that provides security through Authentication, Encryption and data integrity services. Mobile IP data traffic can be secured by combining with IP Security (IPSec) protocol. This thesis describes Mobile IP operations, security threats, different existing methods for securing mobile IP and then IPSec standard, how it works and why IPSec is the best solution. This thesis also describes how to combine IPSec with a mobile IP to provide a solution called (SecMIP) that protects the mobile device’s communication from any threats. Finally it describes Mobile IPv6, binding update and associated security concern.
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Hobaya, Fabrice. "Convergence vers IP des systèmes de télécommunication par satellite". Thesis, Toulouse, INPT, 2011. http://www.theses.fr/2011INPT0072/document.
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Dans un contexte de convergence vers IP du monde des télécommunications, les systèmes de communication par satellite se doivent de suivre la tendance pour rester compétitifs et s'intégrer efficacement au monde Internet. Après avoir rappelé les enjeux d'une convergence dans les systèmes satellite et dressé un panorama des architectures de convergence envisageables, nous avons identifié les limites des systèmes actuels en termes de convergence vers IP. Notre choix se porte alors sur l'architecture IP/GSE pour la voie aller. Nous spécifions ensuite le protocole d'encapsulation GSE-Alt, inspiré de GSE mais adapté à la voie retour. Le déploiement de nouveaux services et l'évolution de services existants sont assurés et rendus plus aisés grâce à la couche IP. Les couches GSE et GSE-Alt optimisent le transport d'IP. Pour offrir un support de communication répondant à la diversité des exigences de qualité des services applicatif, nous définissons ensuite plusieurs mécanismes autorisant la mise en cohérence du traitement de la qualité de service (QoS) aux différents niveaux protocolaires dans les systèmes de communication par satellite. Enfin, pour permettre une interconnexion et une intégration du monde satellite au monde Internet, nous étudions les besoins en termes de déploiement du routage IP. Nous définissons alors une architecture permettant au satellite de réaliser de la commutation de niveau IP. Cette convergence vers un système « tout IP » du segment de communication par satellite est le fondement nécessaire à son insertion transparente au reste du monde des télécommunicationsThe world of telecommunications converging towards IP, the telecommunication satellite systems have to follow the trend to stay competitive and to be integrated to the Internet world. We first remind the issues of convergence in satellite communications, then we list the different convergence architectures conceivable in satellite systems and describe the limits of current systems in term of IP convergence. Our choice is devoted to the IP/GSE architecture for the forward link. Then, we specify the GSE-Alt protocol, inspired from GSE but adapted to the return link. The deployment of new services and the evolution of existing services are possible and made easier thanks to the IP layer. Both layers GSE and GSE-Alt optimize the transport of the IP packets. In order to propose a communication support allowing various quality of service (QoS) needs, we specify several mechanisms allowing a great coherence of the quality of service treatments at the different protocol levels. Finally, to allow an interconnection and an integration of the satellite world to the Internet world, we study the requirements in term of IP routing deployment. Therefore, we specify an architecture allowing the satellite to make the switching at the IP level. This convergence of the satellite towards an "all IP" system is the base required to its transparent insertion to the rest of the telecommunication world
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Ha, Kiryong. "System Infrastructure for Mobile-Cloud Convergence". Research Showcase @ CMU, 2016. http://repository.cmu.edu/dissertations/704.
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The convergence of mobile computing and cloud computing enables new mobile applications that are both resource-intensive and interactive. For these applications, end-to-end network bandwidth and latency matter greatly when cloud resources are used to augment the computational power and battery life of a mobile device. This dissertation designs and implements a new architectural element called a cloudlet, that arises from the convergence of mobile computing and cloud computing. Cloudlets represent the middle tier of a 3-tier hierarchy, mobile device — cloudlet—cloud, to achieve the right balance between cloud consolidation and network responsiveness. We first present quantitative evidence that shows cloud location can affect the performance of mobile applications and cloud consolidation. We then describe an architectural solution using cloudlets that are a seamless extension of todays cloud computing infrastructure. Finally, we define minimal functionalities that cloudlets must offer above/beyond standard cloud computing, and address corresponding technical challenges.
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Salpietro, Rosario. "Un'analisi sperimentale di soluzioni Mobile IP". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amslaurea.unibo.it/1927/.
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Lee, Kwan Hong 1977. "IMPROMPTU : audio applications for mobile IP". Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/61853.
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Thesis (S.M.)--Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2001.Includes bibliographical references (p. 89-94).
IMPROMPTU is an Internet Protocol (IP) based audio platform for mobile communications and networked audio applications. IMPROMPTU supports multiple audio applications on a mobile device communicating over the IP network. The audio user interface on the IMPROMPTU client provides speech interfaces to switch applications and control each application with unique vocabulary and grammar along with providing auditory feedback during the usage of the applications. The alerting model is based on the applications competing to attract user's attention. Various audio applications with different characteristics have been implemented, including radio, MP3 player, and baby monitor. Although IMPROMPTU supports conventional voice telephony services, it does so with increased negotiation between calling parties through more flexible call control. The system architecture is composed of distributed services and applications managed by the Application Manager.
Kwan Hong Lee.
S.M.
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Shankaran, Rajan, University of Western Sydney, of Science Technology and Environment College e School of Computing and Information Technology. "Security issues in mobile IP and mobile ad hoc networks". THESIS_CSTE_CIT_Shankaran_R.xml, 2004. http://handle.uws.edu.au:8081/1959.7/585.
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The need for information anywhere and at any time has been the driving force for the increasing growth in mobile networks and devices. The field of mobile computing is the merger of advances in computing and communications with the aim of providing seamless and ubiquitous computing environment for mobile users. Whereas notebook computers and personal digital assistants (PDAs) are self-contained, networked computing constitutes a new paradigm of computing that is revolutionizing the way computers are used. Mobile networking greatly enhances the utility of carrying a computing device. It provides mobile users with versatile communication to other people and expedient notification of important events, yet with much more flexibility than cellular telephones and pagers. It also permits continuous access to services and resources of the traditional land-based wired networks. This combination of networking and mobility will engender new applications and services, such as collaborative software to support impromptu meetings, electronic bulletin boards that adapt to the contents according to the participants present, self adjusting lighting and heating, and navigation software to guide users in unfamiliar places and tours. To support mobility in the Internet, the Internet Protocol (IP) has been extended to support mobility. Also at the same time, there is also a growing trend for these IP based networks to operate in an infrastructureless environment called mobile ad-hoc networks. However, the proliferation of such mobile networks depends on a multitude of factors, with trustworthiness being one of the primary challenges to be met. The objective of this dissertation is to address the issues involved in the design of security services for Mobile IP and ad-hoc networks. Extensions to IP based networks (both wired and infrastructureless networks) to facilitate mobility have not been designed keeping security in mind. However adequate security features are basic requirements for the continued functioning of mobile networks. Clearly the problem is so broad that there is no way to devise a general solution We aim to address most of these wide- ranging problems and in the process initiate a practical approach to the development of an integrated security infrastructure for mobile networks. The intention is to seamlessly integrate these security services and mechanisms at the IP level within the mobile IP and ad-hoc networks. The provision of security services at the higher and lower layers and their interoperability with our proposed framework is outside the scope of this thesisDoctor of Philosophy (PhD)
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Kale, Snehal Vivek. "Comparative analysis of fixed-mobile convergence technologies". Connect to online resource, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1460861.
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Cetinbas, Emin Ilker. "Simulation Based Investigation Of Mobile Ip Improvements". Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606108/index.pdf.
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In this thesis, performances of some Mobile IP handoff schemes have been compared. The comparison has been based on simulation results. Simulation study has been carried out with a MIP model developed using OMNeT++ and available model frameworks.
The literature on Mobile IP and several improvements including handoff management schemes have been surveyed. A MIP model has been constructed and then validated with the help of some scenarios in the literature, especially the one found in [7]. The model has been then used to investigate performances of FMIP. The study also included performance of FMIP under local traffic where mobile hosts communicate with each other in the same domain.
Simulations are carried out under several scenarios involving UDP and TCP transfers. Mobile host speed and base station buffer size variables have been changed throughout the simulations.
The result show that use of L2 triggers reduces handoff latency as both FMIP Post-Reg and Pre-Reg have better performance than HMIP without L2 triggers. The results also show that FMIP Post-Reg is a good candidate for future MIP infrastructures with its low latency handoff characteristics due to bidirectional tunneling between old and new points of attachment. Moreover, the results suggest that FMIP Post-Reg is also the best handoff scheme under local traffic where mobile hosts communicate among each other in the same foreign network.
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Fieger, Andreas. "Zuverlässige Datenkommunikation für IP-basierte mobile Systeme". [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=961985925.
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Nazir, Sajid. "Multimedia communication over mobile IP wireless networks". Thesis, University of Strathclyde, 2012. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=17816.
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The use of Internet Protocol (IP) based mobile wireless transmission is increasing as novel multimedia applications are being deployed. Mobile wireless channels and IP based communications are inherently prone to errors and packet losses. Error resilience features and Forward Error Correction (FEC) at the application layer (AL) are often used to protect the video data against losses. The amount of redundancy added by the FEC attempts to counter the worst channel Signal-to-noise-ratio (SNR) but the protection generally comes at a high complexity and overhead. It is thus imperative to design FEC solutions which are adaptive to the varying wireless channel conditions, i.e., bandwidth and packet loss rate. This adaptive behaviour becomes even more important for transmission to heterogeneous receivers. Fountain codes are rateless codes which can be used to potentially generate an unlimited number of encoded packets from a limited number of source packets. The decoding is possi ble if the number of received encoded packets at the receiver is just a little more than the source packets. As each portion of encoded video data does not have equal importance for the video re-construction, this characteristic can also be advantageously exploited while designing FEC solutions by providing more protection to important portions. Random linear codes (RLC) based schemes have been compared with Raptor codes, and RLC solution is proposed for the mobile television broadcasting standards like Digital Video Broadcasting-Handheld (DVB-H) and DVB-T2 (Second Generation Terrestrial). A reliable unicast video communication solution based on Luby Transform (LT) codes is proposed by exploiting unequal error protection (UEP) for encoded video data partitioned with the Data partitioning (DP) and slicing feature of H264/AVC. A comparison of layered video data transmission with Amplify-and-Forward (AF) and Decode-and-Forward (DF) relay collaboration strategies is provided. A novel scheme for multiple description coding (MDC) has been proposed and its advantages highlighted through simulations over relay based multi hop channels, like Long Term Evolution- Advanced (LTE-A). An algorithm has been proposed which takes into account the PSNR contribution and temporal significance of each slice to prioritize H.264/AVC sliced video data. The simulation results with systematic RLC show the usefulness of the proposed scheme for applications such as video-on-demand (VoD).
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Kellil, Mounir. "Sécurité Multicast dans les environnements IP Mobile". Compiègne, 2005. http://www.theses.fr/2005COMP1579.
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Ce travail de thèse traite les problèmes de sécurité des communications multipoint (ou Multicast) en environnement IP Mobile. Il a été motivé par l'accroissement des applications de groupes telles que la vidéoconférence, la formation électronique à distance, etc. Cependant, cet accroissement a été accompagné par l'émergence des technologies sans fil (ex. IEEE 802. 11 b, UMTS, etc. ) et les standards de mobilité sur Internet (Mobile IP). Par conséquent, les communications multipoint en environnement IP mobile représentent aujourd'hui une perspective attractive profitant à la fois de l'apport du multipoint (ex. Flexibilité) et de la mobilité. Néanmoins, sécuriser les communications multipoint dans les environnements mobiles est une tâche difficile. En effet, une solution sécurisée pour un tel scénario doit répondre à la fois aux exigences des communications multipoint (ex. Flexibilité) ainsi qu'aux diverses contraintes des environnements mobiles (ex. Faibles ressources et mobilité)The present work addresses the multicast security problem in mobile IP environments. The goal behind such an interest is to efficiently secure future generations of Internet group communications (e. G. Pay-per-view applications, videoconferences, etc), where users can securely communicate together using IP multicasting while seamlessly moving from a network to another. The multicast security problem is challenging and some related topics are still largely open. Moreover, the mobile environments complicate the multicast security problem. Specifically, the mobile environments inherit the security problems of the stationary case, and raise performance and interoperability issues that should be taken into account
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Závodný, Ondřej. "Správa sítí s Mobile IP pomocí SNMP". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-218922.
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The content of this thesis is to research possibilities of using SNMP for management of Mobile IP activated entities. The first two chapters deal with theoretical analysis of Mobile IP protocol, and Simple Network Management Protocol. The Mobile IP protocol analysis focuses especially on the elements Home agent and Foreign agent. In the SNMP chapter the analysis focuses mainly on ways to exchange messages. Another part of the document is devoted to a description of laboratory networks com- posed of routers Cisco 1841 and the configuration of them. Finally is described the programmed application to manager these devices in JAVA, which is included in Annex. The program periodically sends SNMP queries and finds relationships between the Home agent and the mobile nodes, and between the foreign agent and the mobile nodes. The application has a user-friendly interface that is shown on the attached flash animation. Finally, the thesis summarizes the concepts described in previous chapters and the goals to achieve.
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Magnano, Alexander. "Predictive Mobile IP Handover for Vehicular Networks". Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34350.
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Vehicular networks are an emerging technology that offer potential for providing a variety of new services. However, extending vehicular networks to include IP connections is still problematic, due in part to the incompatibility of mobile IP handovers with the increased mobility of vehicles. The handover process, consisting of discovery, registration, and packet forwarding, has a large overhead and disrupts connectivity. With increased handover frequency and smaller access point dwell times in vehicular networks, the handover causes a large degradation in performance. This thesis proposes a predictive handover solution, using a combination of a Kalman filter and an online hidden Markov model, to minimize the effects of prediction errors and to capitalize on advanced handover registration. Extensive simulated experiments were carried out in NS-2 to study the performance of the proposed solution within a variety of traffic and network topology scenarios. Results show a significant improvement to both prediction accuracy and network performance when compared to recent proposed approaches.
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Chew, Kar Ann. "Mobility management in all-IP mobile network". Thesis, University of Surrey, 2004. http://epubs.surrey.ac.uk/842897/.
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With convergence of the Internet and mobile telecommunications, mobile networks are taking more and more IP-based protocols onboard. Mobile networks are expected to evolve and become IP-based packet data networks with various fuctionalities supported by IP-based protocols. This thesis investigates IP protocols for mobility management an all-IP mobile network. The design principles of mobility management in packet data network are first explored by studying GPRS. It is realised that GPRS is only an emulated IP network and lacks of the flexibility of IP networks. Packet scheduling techniques for enhancing mobility management performance and its implementation in GPRS are also studied. Evolution of GPRS to an all-IP based network, in which IP protocols can be used for mobility management, is subsequently proposed. Mobility management protocols in IP networks can be segregated into inter-domain (or macro) mobility, intra-domain (or micro) mobility and mobile ad hoc networking. Mobile IP is a proposal by the IETF as a solution to support mobility of IP terminal. In addition, SIP has been extended by research community to support terminal mobility. Both Mobile IP and extended SIP are compared for their ability to support mobility. It is found that Mobile IP is more suitable for supporting terminal mobility. However, Mobile IP is not sufficient for supporting intra-domain and high-speed mobility. An optimised solution therefore consists of Mobile IP and a specialised intra-domain mobility scheme. Having identified the characteristics and design principles of various existing inti-a-domain mobility protocols, a novel protocol known as Mobility-Aware Routing Protocol, MARP, is proposed. It is compared to some existing protocols and is proven to be superior in term of better handoff support, flexibility in packet routing and scalability. Mobile ad hoc networks are expected to be integral part of all-IP mobile network. Interworking of ad hoc and infrastructure-backed mobile networks enables extension of wireless networks coverage and provision of Internet access to mobile node with relaying. Key issues related to such a hybrid networking topology, in the context of ad hoc IP routing protocol and mobility management protocol, are identified. Mechanisms that allow interworking of mobility protocols and ad hoc routing protocols are designed. Interworking of both protocols significantly increases capability of ad hoc mobile nodes to interact with fixed network elements, but is at the cost of high control overhead. Effective techniques for reducing control overhead in the hybrid network is subsequently proposed.
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So, Yick Hon Joseph, e joseph so@rmit edu au. "Wireless IP Network Mobility Management: Advancing from Mobile IP to HIP-Based Network". RMIT University. Electrical and Computer Engineering, 2009. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20090507.123036.
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Wireless networking introduces a whole range of challenges to the traditional TCP/IP network. In particular, IP address the issue of overloading because IP addresses are used as a network locator and an end point identity in the different layers in an OSI model. Even though Mobile IP is widely deployed, it has significant problems relating to performance and security. The Host Identity Protocol (HIP) provides secure mobility management by solving the IP address overloading from another angle. It restructures the TCP/IP model and introduces a new layer and a new namespace. The performance of HIP has proven to be better than Mobile IP and also opens a range of new research opportunities. This dissertation proposes and analyses a new step-stone solution from the Mobile IP-based network into a HIP-based network. The main advantage of this new solution is that much less change is required to the operating system kernel of the end point compared to a full HIP implementation. The new step-stone solution allows Mobile IP to use some HIP features to provide better security and handover performance. This dissertation also proposes several new and novel HIP-based wireless communication network architectures. An HIP-based heterogeneous wireless network architecture and handover scheme has been proposed and analysed. These schemes limit the HIP signalling in the wireless network if no communication to external networks is needed. Beside the network architecture modification, the hybrid Session Initial Protocol (SIP) and HIP-based Voice over IP (VoIP) scheme is proposed and analysed. This novel scheme improves the handover latency and security. This dissertation also proposes and analyses a new and novel extension to HIP, a HIP-based micro-mobility management, micro-HIP (mHIP). mHIP provides a new secure framework for micro-mobility management. It is a more complete HIP-based micro-mobility solution than any other proposed in existing studies. mHIP improves the intra-domain handover performance, the security, and the distribution of load in the intra-domain handover signalling. The new work presented opens up a number of very interesting research opportunities.
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Phillips, Theodore. "Improved mobile IP based foreign agent selection method /". Available to subscribers only, 2009. http://proquest.umi.com/pqdweb?did=1966541911&sid=18&Fmt=2&clientId=1509&RQT=309&VName=PQD.
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Hauser, Christian. "Protecting virtual identities in mobile IP-based communication /". Stuttgart : Inst. für Kommunikationsnetze und Rechnersysteme, 2007. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=016534457&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
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Phillips, Theodore T. "IMPROVED MOBILE IP BASED FOREIGN AGENT SELECTION METHOD". OpenSIUC, 2009. https://opensiuc.lib.siu.edu/theses/129.
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Computers are becoming smaller and more mobile, as they do they are becoming relied upon more and more for critical applications. These applications require an always on high bandwidth connection from the field to the internet. It is this reason that techniques must be developed. In a system where a mobile router chooses amongst several differing types of networks, the router must be given as much information as possible so that it can make the best choice as to who it should connect to when it leaves its home network. This paper proposes that the mobile router be given a metric, called dynamic preference level, based upon the conditions of each possible next hop so that when the router needs to handoff from one access point to another it makes the best, informed, decision it can. This metric will use the amount of free bandwidth available in addition to other factors such as path loss.
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Sheng, Yingli. "Security mechanisms for next generation mobile IP networks". Thesis, University of Surrey, 2011. http://epubs.surrey.ac.uk/843409/.
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With the advent of various access technologies and increasing number of applications, a set of challenges concerning efficient delivery of ubiquitous services to heterogeneous users and devices have been posed. Mobile IP protocol can be used to enable roaming across different access technologies. One of the important challenges in Mobile IP is security. The service delivery should be secured and efficient, which implicates that security should be integrated with mobility management (MM), Quality-of-Service (QoS) to minimise the negative impact of security mechanisms. It is proposed in the thesis an architectural framework, which uses Hierarchical Mobile IPv6 (HMIPv6) protocols interworking with Authentication, Authorization, Accounting (AAA) framework. The concept of Enhanced Node (EN) is introduced in the framework. The EN is empowered with intelligence to integrate security, MM and QoS. The focal point of the work is to address security challenges based on the framework and to evaluate the impact of security mechanisms on the mobile networks in terms of extra signalling load introduced. Three security mechanisms are proposed in the thesis, according to the handover domains. For handover across two access networks, an enhanced AAA solution is proposed to provide the mobile node authenticated network access. It establishes keys between serving access network and target access network for the purpose of securing context transfer. Also keys are established between mobile node and the target access network for future use after mobile node (MN) roams to the target access network. For micro-mobility handover within one EN domain, an enhanced key management scheme is proposed to generate a bunch of handover keys for all of the access routers (AR) within one EN domain instead of generating key every single time the mobile node changes the AR in the previous mechanism. The enhanced key management scheme reduces the handover disruption time introduced by security. For fast handovers within one EN domain (micro-mobility handover) and across EN domains (macro-mobility handover), the security mechanism is proposed to secure the fast handover between ARs/enhanced nodes. The fast handover key is established between previous AR/EN and new AR/EN, thus, the fast handover registration messages between ARs/ENs can be secured. More importantly, the context transfer messages between previous EN and new EN for the purpose of prompting "smooth handover", can be protected using the fast handover keys. The performance of three proposed solutions is evaluated using analytical models. Signalling cost is the main parameter to be evaluated. Discussions on advantage and disadvantage of each proposed mechanisms are also provided at the end of chapter 4, 5 and 6 respectively.
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Dubois, Emmanuel Beylot André-Luc. "Convergence dans les réseaux satellite". Toulouse : INP Toulouse, 2009. http://ethesis.inp-toulouse.fr/archive/00000681.
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Weir, Malcolm. "TECHNOLOGY CONVERGENCE: OBSERVATIONS ON TRANSITIONAL APPROACHES FOR DATA ACQUISITION IN A TCP/IP ENVIRONMENT". International Foundation for Telemetering, 2007. http://hdl.handle.net/10150/604539.
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ITC/USA 2007 Conference Proceedings / The Forty-Third Annual International Telemetering Conference and Technical Exhibition / October 22-25, 2007 / Riviera Hotel & Convention Center, Las Vegas, NevadaThis paper discusses how IRIG 106 Chapter 10 recording techniques could be employed in a network-centric environment, while maintaining as many of the strengths of the traditional approach. In the course of that discussion, aspects of the published standard which would have to be disregarded or reinterpreted for a network-centric approach to be adopted are illustrated.
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Yin, Chunjiang. "Convergence techniques in a multi-standard mobile communication environment". Göttingen Cuvillier, 2008. http://d-nb.info/990658252/04.
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Tevemark, Jonas. "Intrusion Detection and Prevention in IP Based Mobile Networks". Thesis, Linköping University, Department of Electrical Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-12015.
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Ericsson’s Packet Radio Access Network (PRAN) is a network solution for packet transport in mobile networks, which utilizes the Internet Protocol (IP). The IP protocol offers benefits in responsiveness and performance adaptation to data bursts when compared to Asynchronous Transfer Mode (ATM), which is still often used. There are many manufacturers / operators providing IP services, which reduce costs. The IP’s use on the Internet brings greater end-user knowledge, wider user community and more programs designed for use in IP environments. Because of this, the spectrum of possible attacks against PRAN broadens. This thesis provides information on what protection an Intrusion Prevention System (IPS) can add to the current PRAN solution.
A risk analysis is performed to identify assets in and threats against PRAN, and to discover attacks that can be mitigated by the use of an IPS. Information regarding placement of an IPS in the PRAN network is given and tests of a candidate system are performed. IPS features in hardware currently used by Ericsson as well as missing features are pinpointed . Finally, requirements for an IPS intended for use in PRAN are concluded.
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Günter, Manuel. "Customer-based IP service monitoring with mobile software agents /". Basel [u.a.] : Birkhäuser, 2002. http://www.loc.gov/catdir/enhancements/fy0812/2002074391-d.html.
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Vokkaarne, Vijay. "A Fault Tolerant Mobile IP based on Ring Protocol". [Gainesville, Fla.] : University of Florida, 2002. http://purl.fcla.edu/fcla/etd/UFE1001192.
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SANTOS, LUCIANO DA SILVA. "FAULT TOLERANCE OF MOBILITY AGENTS OF PROTOCOL MOBILE IP". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2005. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=7583@1.
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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIORO crescimento da Internet, tanto do ponto de vista do número de usuários como dos serviços oferecidos, e o rápido progresso da tecnologia de comunicação sem fio, tornou possível uma demanda crescente por sistemas sem fios que permitam o acesso a Internet. Porém, um dos principais fatores desafiadores para o desenvolvimento desta nova forma de acesso é a mobilidade das estações móveis. A fim de resolver todos os problemas relacionados à introdução da mobilidade nesta nova forma de acesso, a Internet Engineering Task Force (IETF) através de pesquisas definiu o Mobile IP como o protocolo padrão para esse novo cenário. Embora este protocolo receba inúmeras contribuições que visam melhorar o seu desempenho tanto nas questões de handoff e de segurança dos registros dos usuários, este protocolo não recebe a mesma atenção para a questão da falha dos seus Agentes de Mobilidade. Estes agentes suportam as conexões das estações móveis integrando as redes sem fio com as redes IP amplamente difundida. Portanto, o objetivo desta dissertação é apresentar uma proposta de tolerância à falha dos Agentes de Mobilidade a fim de contribuir nesta linha de pesquisa.
The growth of the Internet, as much of the point of view of the number of users as of the offered services, and the fast progress of the wireless communication technology, it became possible a demand for wireless systems that allow the access the Internet. However, one of the main challenging factors for the development this new access way is the mobility of the mobile stations. In order to solve all of the problems related to the introduction of the mobility in this new access form, the Internet Engineering Task Forces (IETF) through researches it defined Mobile IP as the standard protocol for that new scenery. Although this protocol receives countless contributions that seek to improve it so much acting in the handoff subjects and of safety of the users' registrations, this protocol doesn't receive the same attention for the subject of the fault of their Mobility Agents. These agents support the connections of the mobile stations integrating the wireless networks with IP netowrks spread. Therefore, the objective of this dissertation is to present a proposal of fault tolerance of the Mobility Agents in order to contribute in this research line.
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GOSSAIN, HRISHIKESH. "A NOVEL SCHEME TO PROVIDE MULTICAST OVER MOBILE-IP". University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1046978374.
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Hasson, Albert M. "Mobile IP movement detection optimisations in 802.11 wireless LANs". Master's thesis, University of Cape Town, 2005. http://hdl.handle.net/11427/6687.
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The IEEE 802.11 standard was developed to support the establishment of highly flexible wireless local area networks (wireless LANs). However, when an 802.11 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 allows a mobile node to perform an IP handoff without breaking its active upper-layer sessions. Unfortunately, these handoffs introduce large latencies into a mobile node's traffic, during which packets are lost. As a result, the mobile node's upper-layer sessions and applications suffer significant disruptions due to this handoff latency. One of the main components of a Mobile IP handoff is the movement detection process, whereby a mobile node senses that it is attached to a new IP network. This procedure contributes significantly to the total Mobile IP handover latency and resulting disruption. This study investigates different mechanisms that aim to lower movement detection delays and thereby improve Mobile IP performance. These mechanisms are considered specifically within the context of 802.11 wireless LANs. In general, a mobile node detects attachment to a new network when a periodic IP level broadcast (advertisement) is received from that network. It will be shown that the elimination of this dependence on periodic advertisements, and the reliance instead on external information from the 802.11 link layer, results in both faster and more efficient movement detection. Furthermore, a hybrid system is proposed that incorporates several techniques to ensure that movement detection performs reliably within a variety of different network configurations. An evaluation framework is designed and implemented that supports the assessment of a wide range of movement detection mechanisms. This test bed allows Mobile IP handoffs to be analysed in detail, with specific focus on the movement detection process. The performance of several movement detection optimisations is compared using handoff latency and packet loss as metrics. The evaluation framework also supports real-time Voice over IP (VoIP) traffic. This is used to ascertain the effects that different movement detection techniques have on the output voice quality. These evaluations not only provide a quantitative performance analysis of these movement detection mechanisms, but also a qualitative assessment based on a VoIP application.
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Salvatierra, León Karen Andrea. "Implementación de mobile IP entre redes móviles y WLAN". Tesis, Universidad de Chile, 2012. http://www.repositorio.uchile.cl/handle/2250/112061.
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Ingeniera Civil ElectricistaLa evolución de las redes de comunicaciones móviles avanza hacia la unificación de un ambiente heterogéneo en el cual se interconectan entre sí redes de distintos accesos. En este escenario, la mantención de sesiones de internet de los usuarios, cuando éstos se mueven de una red a otra, emerge como uno de los principales desafíos a enfrentar. La introducción de un protocolo de movilidad en la red aparece como solución a este problema, facilitando el roaming entre redes y evitando la reconexión de las sesiones del usuario. El despliegue de redes wireless de área local (WLAN) es un económico medio para acceder a internet a diferencia de las redes celulares con soporte de redes de paquetes. Mientras que las redes WLAN poseen un ancho de banda significativamente mayor al de las redes móviles, estas redes poseen una amplia cobertura que incentiva la interconexión entre ambas tecnologías. En este trabajo se desarrolla un modelo de interconexión de redes celulares y WLANs utilizando Mobile IP. Las simulaciones se realizan en el software computacional OPNET y el soporte de movilidad se enfoca desde el nivel IP utilizando los protocolos Mobile IP en un ambiente global; y Proxy Mobile IP en un ambiente localizado, ambos en su versión IPv4. Los resultados MIP muestran una asimetría entre delays end-to-end producto del camino triangular del tráfico de datos. Esto lleva a una ineficiencia en el ruteo que afecta principalmente a aplicaciones en tiempo real. El roaming hacia la red WLAN provoca una disminución en los delays end-to-end en ambas direcciones situándose entre 56 % y 71 % cuando el estado de la red de internet tiene asociado una baja latencia. El establecimiento de sesiones TCP sube en un 7 % mientras que el control de aplicaciones de descarga FTP baja en 29 %. En el caso de PMIP, el 3-way handshake disminuye en un 14 % mientras que el control de aplicación FTP en un 41 %. Este protocolo no evidencia ineficiencia en el ruteo, tendiéndose además una disminución de delays end-to-end incluso con latencia de red de 100 ms. Lo positivo de enfocar la movilidad desde el nivel IP se encuentra en la indiferencia que supone el tipo de acceso a nivel de capa de enlace. La ventaja de PMIP sobre MIP es que no requiere de software especializado en el cliente, reduciendo así los costos de señalización en el establecimiento del servicio de movilidad. MIP por su parte, es idóneo de ser utilizado en un esquema de interconexión global, por lo que su integración con PMIP puede ser vista de manera complementaria estableciendo un esquema jerárquico con este último proveyendo movilidad a nivel local.
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Aldalaty, Khalid. "Mobile IP handover delay reduction using seamless handover architecture". Thesis, Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-6149.
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Seamless communication is becoming the main aspect for the next generation of the mobile and wireless networks. Roaming among multiple wireless access networks connected together through one IP core makes the mobility support for the internet is very critical and more important research topics nowadays. Mobile IP is one of the most successful solutions for the mobility support in the IP based networks, but it has poor performance in term of handover delay. Many improvements have been done to reduce the handover delay, which result in two new standards: the Hierarchical MIP (HMIP) and the Fast MIP (FMIP), but the delay still does not match the seamless handover requirements. Finally Seamless MIP (S-MIP) has been suggested by many work groups, which combine between an intelligent handover algorithm and a movement tracking scheme. In This thesis, we show the handover delay reduction approaches, specifically the Seamless Mobile IP. The thesis studies the effects of the S-MIP in the handover delay and the network performance as well. A simulation study takes place to compare between the standard MIP and the new suggested S-MIP protocol in term of handover delay, packet loss and bandwidth requirement. The thesis concludes with the analyzing of the simulation results, evaluating the S-MIP performance and finally gives some suggestions for the future work.0046704623257
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Chang, Chung-yen, e 張中彥. "Develop an Access Authentication Mechanism for Fixed Mobile Convergence – based on IP Multimedia Subsystem". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/78332477872891380893.
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碩士國防管理學院
國防資訊研究所
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Along with the widespread applications of tele-communication and internet systems, the integration of network and multimedia service is undergoing. How to provide an easy, secure and multi-functioned platform has been the research topic in the industry. The third Generation Partnership Project (3GPP) has proposed IP multimedia subsystem (IMS) as the means to achieve multimedia system in multi-functioned platform and satisfy the cell phone ? needs for roaming, billing, security and quality of service. IMS also provides the solutions for the next generation network (NGN) and formations of succeeding protocols. This thesis intends to develop an access authentication mechanism for Fixed Mobile Convergence (FMC) based on IP multimedia subsystem (IMS). We propose two methods: one is to integrate EAP-AKA protocol to the SIM (Subscriber Identity Module) smart card for security and authentication purposes and the other is to use the functions embedded in SIM smart card for authentication only. We try to achieve the following goals: First, transplant the authentication mechanism of internet access to the mobile phone environment. Second, simplify the access authentication and registration method for identification purpose. Third, use SIM card to complete the authorization and registration processes. In all, we hope to find a way to integrate network identification and authentication in the future.
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Ζαφειρόπουλος, Διονύσης. "Διερεύνηση παραμέτρων σύγκλισης μεταξύ δικτύων κινητής τηλεφωνίας και ασυρμάτων δικτύων δεδομένων". Thesis, 2009. http://nemertes.lis.upatras.gr/jspui/handle/10889/1799.
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Στην εν λόγω εργασία, έγινε μια προσπάθεια καταγραφής του τεχνολογικού τοπίου της τηλεπικοινωνιακής αγοράς, με έμφαση την διαλειτουργικότητα μεταξύ των Δικτύων Κινητής Τηλεφωνίας και των Ασύρματων Δικτύων Δεδομένων και των σχετικών αλλαγών που έχει επιφέρει αυτή η διαλειτουργικότητα, τόσο στις παρεχόμενες υπηρεσίες, όσο και στα εφαρμοζόμενα επιχειρηματικά μοντέλα από πλευράς εταιρειών της συγκεκριμένης αγοράς.
Στα πλαίσια αυτής της προσπάθειας, χρειάστηκε να πραγματοποιηθεί μια λεπτομερής καταγραφή των τεχνολογικών εξελίξεων, σε επίπεδο τεχνικών προδιαγραφών και προτύπων, στις παραπάνω δύο κατηγορίες δικτύων, ώστε να καταλήξουμε σε εκείνα τα πρότυπα που πλέον μπορούν να οδηγήσουν στην υλοποίηση δικτύων τα οποία θα χαρακτηρίζονται από τα παρακάτω:
• θα είναι ενοποιημένα ώστε οι διαφορετικές τεχνολογικές πλατφόρμες των εταιρειών να λειτουργούν απρόσκοπτα,
• θα χαρακτηρίζονται από χαμηλό κόστος,
• ο τελικός χρήστης θα μπορεί να είναι συνεχώς συνδεδεμένος με κάποιο δίκτυο ασύρματης πρόσβασης και να απολαμβάνει τις υπηρεσίες που επιθυμεί, οποτεδήποτε και οπουδήποτε.
Η δομή της διπλωματικής εργασίας ακολουθεί τον προαναφερθέντα τρόπο σκέψης. Στο 1ο Κεφάλαιο γίνεται μια σύντομη παρουσίαση του στόχου σε επίπεδο τεχνολογιών αλλά και υπηρεσιών, δηλαδή των αναμενόμενων αποτελεσμάτων αυτών των δικτύων νέας γενιάς, στα οποία έχουμε συνηθίσει να αναφερόμαστε ως δίκτυα 4G (4th Generation) ή δίκτυα B3G (Beyond 3G) ή τέλος ως All – IP ασύρματα δίκτυα.
Στο 2ο Κεφάλαιο, γίνεται μια λεπτομερής παρουσίαση των Δικτύων Κινητής Τηλεφωνίας από τις πρώτες τους εκδοχές (1G) έως τις πλέον σύγχρονες (3.5G) που έχουν εμφανιστεί μέχρι σήμερα. Αναλύονται τόσο οι γενιές των δικτύων όσο και τα χρησιμοποιούμενα πρότυπα, σε επίπεδο αρχιτεκτονικής όσο και σε επίπεδο πρωτοκόλλων. Στη συνέχεια του κεφαλαίου υπάρχει η τεχνική περιγραφή των επικρατέστερων δικτύων κινητής τηλεφωνίας, σήμερα, δηλαδή των GSM, GPRS και UMTS, ενώ στο τέλος του κεφαλαίου υπάρχει μια σύντομη περιγραφή της διαδικασίας intersystem handover μεταξύ των GSM και UMTS.
Στο 3ο Κεφάλαιο, περνάμε πλέον στα Ασύρματα Δίκτυα Δεδομένων. Γίνεται μια εκτενής περιγραφή των προτύπων που έχουν καθοριστεί και συγκεκριμένα στα πρότυπα IEEE 802.15 Wireless Personal Area Networks (WPANs) με κυριότερους εκφραστές τα δίκτυα βασιζόμενα σε Bluetooth και IrDA, το πρότυπο IEEE 802.11 Wireless Local Area Networks (WLANs) με σημαντικότερος εκπροσώπους τα WiFi και HyperLan/2, το πρότυπο IEEE 802.16 Wireless Metropolitan Area Networks (WMANs) ή αλλιώς γνωστότερο ως WiMAX και τέλος το πρότυπο IEEE 802.20 Wireless Wide Area Networks (WWANs) ή διαφορετικά Mobile Broadband Wireless Access (MWBA) το οποίο είναι υπό διερεύνηση ακόμα και φιλοδοξεί να αποτελέσει το ασύρματο ανάλογο της τεχνολογίας xDSL, καθώς θα προσφέρει ασύρματες ευρυζωνικές υπηρεσίες.
Στο 4ο Κεφάλαιο παρουσιάζονται μεθοδολογίες υλοποίησης του integration μεταξύ δικτύων των δύο κατηγοριών και συγκεκριμένα παραδείγματα διαλειτουργικότητας, όπως μεταξύ GPRS ή UMTS και WLANs ή μεταξύ UMTS και WiMAX. Γίνεται εκτενής συζήτηση γύρω από τα προβλήματα που θα πρέπει να αντιμετωπιστούν, όπως η εξασφάλιση ανεκτού επιπέδου QoS, οι μηχανισμοί για handover μεταξύ των δικτύων, η διαχείριση της κινητικότητας των χρηστών και των τερματικών και δίνονται παραδείγματα δημιουργίας ενοποιημένων δικτύων, τόσο με τη τεχνική της χαλαρής όσο και με την τεχνική της ισχυρής ζεύξης. Στο τελευταίο τμήμα του Κεφαλαίου, γίνεται μια εκτενής αναφορά στις αρχιτεκτονικές διασύνδεσης ετερογενών δικτύων με IP δίκτυα κορμού, τα γνωστά All – IP networks. Ιδιαίτερη έμφαση δίνεται στους μηχανισμούς πραγματοποίησης των handovers βάσει πολιτικών (policy based) και η χρήση τεχνικών για micromobility και macromobility σε σχέση με την κινητικότητα των τερματικών.
Το 5ο Κεφάλαιο αφορά τις εφαρμογές και υλοποιήσεις ασυρμάτων δικτύων δεδομένων στον Ελληνικό χώρο, στα πλαίσια του Επιχειρησιακού Προγράμματος «Κοινωνία της Πληροφορίας» και πιο συγκεκριμένα τα «Εξοπλισμός και δικτύωση σε όλες τις βαθμίδες της εκπαίδευσης», «Ασύρματα Ευρυζωνικά Δίκτυα ΟΤΑ»και «Μητροπολιτικά Ευρυζωνικά Δίκτυα Οπτικών Ινών ΟΤΑ» και ουσιαστικά αποτελούν παραδείγματα και υλοποιήσεις διασύνδεσης WiFi, WiMAX και IP backbone δικτύων όπως το ΣΥΖΕΥΞΙΣ με δυνατότητες για παροχή VoIP.In this thesis, an effort of presenting the technological landscape of the telecommunication market takes place, with focus on the interoperability between the Mobile Telephony Networks and the Wireless Data Networks and the relative changes that have evolved through this interoperability, both regarding the provided services and the applied business models by the enterprises of the specific market. Within the frames of this effort, a detailed recording of technological developments is realised, in terms of technical specifications and standards, in the two aforementioned categories of networks, so as to conclude to those standards that are utilized by the next generation networks (4G) which will be: • Networks that will be unified so as the different technological platforms will function smoothly. • Networks that will be characterized by low cost of deployment. • The end user will be continuously connected with a wireless access network, enjoying the preferred services anywhere and anytime. The master thesis structure follows the aforementioned methodology. The 1st Chapter includes a short presentation of expected results, both in terms of technologies and services for next generation networks, which we usually refer to as 4G networks (4th Generation) or B3G networks (Beyond 3G) or finally as All - IP wireless networks (AIPN). In the 2nd Chapter, a detailed presentation of Mobile Telephony Networks takes place, from their first versions (1G) until the most modern (3.5G) that have been presented up to today. The analysis includes both the various generations of networks and the used standards, in terms of modulation and multiplexing techniques. The rest of the chapter focuses on the technical description of the prevailing networks, GSM, GPRS and UMTS, while the chapter ends with a short description of intersystem handover processes between GSM and UMTS. Τhe 3rd Chapter, includes an extensive description of the Wireless Data Networks standards such as: IEEE 802.15 Wireless Personal Area Networks (WPANs) with main representatives networks based on Bluetooth and IrDA, standard IEEE 802.11 Wireless Local Area Networks (WLANs) mainly represented by WiFi and HyperLan/2, IEEE 802.16 Wireless Metropolitan Area Networks (WMANs) standard, widely known as WiMax and finally the IEEE 802.20 Wireless Wide Area Networks (WWANs) standard, namely Mobile Broadband Wireless Access (MWBA) that is still under development and aspires to constitutes the wireless version of the xDSL technology, since it aims to provide wireless broadband services. In the 4th Chapter methodologies for integrating the two types of networks, are presented along with examples of interoperability between GPRS / UMTS and WLANs or between UMTS and WiMAX. Extensive discussion around the problems that should be faced, as the guarantee of bearable QoS level, the mechanisms for handover between the networks and the management of mobility of users and terminals, is held. Moreover, examples of integrated networks with both loose and tight coupling methodologies are presented. The last section of the chapter concerns a detailed description of architectures for interconnecting heterogeneous wireless networks over IP – based backhaul networks, namely All – IP networks, with special focus on policy based handover mechanisms and techniques for managing micromobility and macromobility issues. The 5th Chapter concerns the changes taking place in the telecommunications market deriving from the technological progress in the subject of heterogeneous wireless networks interconnection. New service packets are created, as a result of new business plans that are drawn up by the big telecommunications organizations. Finally, we present the developments in the Greek market and subsidised projects from Information Society AE, via which wireless networks have been materialised, with aim to promote Broadband Services.
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Παντελής, Ιάσων-Κωνσταντίνος. "Μελέτη δικτύων επόμενης γενιάς και μοντελοποίησή τους στο περιβάλλον του OPNET". Thesis, 2011. http://nemertes.lis.upatras.gr/jspui/handle/10889/4675.
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Ο όρος ‘Δίκτυα Επόμενης Γενιάς’ αναφέρεται σε μελλοντικά δίκτυα πρωτοποριακής λογικής και δομής, προσανατολισμένα στην υποστήριξη σύγχρονων απαιτητικών εφαρμογών και στη βελτίωση της λειτουργικότητας της τερματικής συσκευής, όπως την αντιλαμβάνεται ο χρήστης.
Πολύ σημαντικά στοιχεία της νέας τηλεπικοινωνιακής πραγματικότητας που επιφέρουν τα δίκτυα αυτά, και με τα οποία σχετίζεται άμεσα η παρούσα εργασία, είναι η διάθεση προώθησης της γενικευμένης κινητικότητας των ασύρματων χρηστών και η ενθάρρυνση της σύγκλισης επιμέρους τεχνολογιών διαφορετικών δικτύων και της δημιουργίας υβριδικών ετερογενών δικτύων, με στόχο την επίτευξη καλύτερης αξιοποίησης του φάσματος και βελτίωσης των ρυθμών μετάδοσης δεδομένων.
Σκοπός της παρούσας διπλωματικής εργασίας είναι η παρουσίαση της δομής και των λειτουργιών των Δικτύων Επόμενης Γενιάς, καθώς και ορισμένων υπαρχόντων τύπων ασύρματων δικτύων, η συνεργασία των οποίων θα μπορούσε να προσφέρει τα επιθυμητά πλεονεκτήματα. Δύο τέτοια είδη δικτύων είναι το δίκτυο κινητής τηλεφωνίας UMTS και τα τοπικά δίκτυα τεχνολογίας WLAN, τα οποία εξετάζονται ενδελεχώς ως προς τα χαρακτηριστικά τους και, κυρίως, ως προς τους μηχανισμούς διευθέτησης της περιαγωγής των χρηστών. Περιλαμβάνεται επίσης μία περιγραφή της λειτουργίας του Mobile IP, πρωτοκόλλου που θεωρείται ιδιαίτερα χρήσιμο για τη διαχείριση της κινητικότητας χρηστών ανάμεσα σε περιοχές εξυπηρέτησης διαφορετικών δικτύων.
Η εργασία καταλήγει στη μοντελοποίηση των παραπάνω συστημάτων σε περιβάλλον εξομοίωσης, επιδιώκοντας την αξιολόγηση της αποτελεσματικότητας του ενδεχόμενου συνδυασμού των συστημάτων UMTS και WLAN και της χρησιμότητας του Mobile IP.
Το λογισμικό που χρησιμοποιείται γι’ αυτόν το σκοπό είναι το OPNET Modeler ®, ένα πρόγραμμα που αναδεικνύεται τα τελευταία χρόνια σε εργαλείο όλο και περισσότερο πολύτιμο, τόσο σε ερευνητικό όσο και σε επιχειρησιακό επίπεδο.The term ‘Next Generation Networks’ refers to future networks of revolutionary concept and structure, oriented to the support of demanding applications and the upgrade of the terminal device’s functionality, as perceived by the user. Some very important aspects of the new telecommunications reality that is brought on by these networks, and to which this project is directly related, is the intention of promoting generalized mobility for the wireless users and the encouragement of the convergence of distinct network technologies and of the foundation of new hybrid heterogeneous networks, in order to achieve better spectrum utilization and improvement of data transmission rates. The purpose of the current diploma thesis project is to present the structure and the functions of the Next Generation Networks, as well as of some existing types of wireless networks, the cooperation of which could provide the desirable advantages. Two such network types are the UMTS mobile telephony network and the local networks of WLAN technology, that are examined thoroughly towards their characteristics and, foremost, towards their roaming arrangement mechanisms. Also included is a description of the operation of Mobile IP, a protocol that is considered particularly convenient for the management of users’ mobility between service areas of different networks. The project concludes to the modeling of the above mentioned systems in a simulation environment, aiming to evaluate the efficiency of the prospective combination of the UMTS and WLAN systems and the utility of Mobile IP. The software used for this purpose is OPNET Modeler ®, a program that has emerged during the last years as an increasingly valuable research and business tool.
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"Toward All-IP networks : IP and wireless networks convergence". Universitat Politècnica de Catalunya, 2005. http://www.tesisenxarxa.net/TDX-0602110-133410/.
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"Improving the convergence of IP routing protocols". Université catholique de Louvain, 2007. http://edoc.bib.ucl.ac.be:81/ETD-db/collection/available/BelnUcetd-10262007-143121/.
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Wang, Jian Hui. "Security in mobile IP". Thesis, 2003. http://spectrum.library.concordia.ca/2008/1/MQ77995.pdf.
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With the rapid development of wireless networks, mobile computing has become a reality. Mobile IP provides a framework for transparent mobility based on the existing IP protocol, which allows the mobile user to use the same IP address to communicate with others, even when the mobile user changes its point of attachment to the network. However, Mobile IP is subject to a variety of security threats. Some originate from Internet Protocol (IP) vulnerabilities; some are rooted in the Mobile IP protocol itself. IPSec is an IP-layer security solution for network traffic, which provides extensive services for confidentiality, authentication, and integrity of data communication. Mobile IP data communication can be protected by integration with IPSec. This report describes the security issues in Mobile IP, what IPSec is, and how and why IPSec can solve Mobile IP security problems. This report also describes the details of SecMIP, a prototype we have created to demonstrate the integration of IPSec with Mobile IP.
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Chang, Yi-Fan, e 張誼凡. "RSVP for Mobile IP". Thesis, 1998. http://ndltd.ncl.edu.tw/handle/04545209668153824896.
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WEN, FU CHIEN, e 傅建文. "Mobile IP based Military Mobile Communication Network". Thesis, 2002. http://ndltd.ncl.edu.tw/handle/94310400047507255929.
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碩士國防管理學院
國防資訊研究所
90
Mobile IP is a router protocol standard proposed by the IETF and provides the capability of roaming in IP networks without changing any application program and IP address. Better mobile network structures had been proposed such as Cellular IP, HAWAII, TeleMIP, and TIMIP, etc. They utilize the characteristic of local management to improve the efficiency of Mobile IP. These mobile networks are built upon All-IP networks and possess merits of multimedia communication. Based on the advantage of high integration, flexibility, and performance, they are possibly adopted in the third generation mobile communication system. Therefore, utilizing military network resources and planning a core network with a mobile mechanism to enhance the military capability of mobile communication is an important issue. In this thesis, a NLMIP mobile network structure with Mobile IP function and the feature of local management is proposed. It is built upon a local network. By means of the mechanism of core network, it provides the capability of seamless mobile communication to the IP network users. The NLMIP can be used in a variety of applications such as VOIP, real time video, tele-monitoring, command transmission, GPS, etc. The NLMIP also provides a digital integrated platform for the military. It improves the problem of communication equipment shortage of the push-to-talk. The planning and operation mechanism of the NLMIP are discussed. The optimization and the application issues are also discussed to offer a reference of building a military mobile communication network.
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Jia, Wen-Kang, e 賈文康. "A Study on All-Optical IP Convergence Networks". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/37626992646150685248.
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博士國立交通大學
資訊科學與工程研究所
99
With emerging trends for ubiquitous data services, the IP-optical convergence networks are gradually becoming a preferred technology. In optical access networks, Ethernet Passive Optical Network (EPON) is becoming a major technology for pervasive access. For optimizing the performance, Chapter 2 firstly applies IEEE 802.3 frame burst mode (FBM) to the EPON downstream link and compare its performance with current techniques for various traffic patterns. Then, Chapter 3 investigates a preemptive priority transmission technique that works on MAC and PHY layer of EPONs. It effectively reduces the frame queuing delay as well as jitter, so as to enhance precise time synchronization in EPONs. Thus, the hard realtime QoS-guarantee for highly delay-sensitive services such as Circuit Emulation Services over EPON (CESoEPON) could be enhanced. In optical core networks, a major obstacle in realizing all-optical switched IP network is due to the large processing delays of optical switching nodes which still need OEO conversion at the optical header (label) processing. In Chapter 4, a novel concept: SOLOS architecture was proposed to support AOS in word and deed. Similar with GMPLS, an optical label switching based on source routing information is attached to IP packets for fast interconnection purpose. The proposed labeling scheme requires neither table lookup nor label replacing in the stateless all-optical switching node, labeled packets/bursts will be forwarded through self-routing, and the only operation in optical switching nodes is to strip off its label part which represents the output port. Thus the whole processing has been completed in the optical domain. Finally, an innovative all-optical multicasting architecture: COXcast based on unicast and eXplicit multicast (Xcast) was proposed in Chapter 5, the scheme represents the multicast tree by decoding the bitmap of its corresponding output port using a common identifier and a node-specific key, so that multicast packets can be self-routed to multiple receivers without requiring header modification, and intermediate nodes on the multicast tree will be stateless. COXcast can reduce the processing cost, protocol overhead and delivery latency. The simulation results indicated that our proposed scheme achieves a remarkable performance in scalability while simplifying the deployment and management of a large number of medium-scale multicast groups especially for multiparty conferences in AOS networks. The remarkable performance improvement of the proposed schemes and architectures are proven through both mathematical analysis and simulations. The purposes of this dissertation are to shed light on a very active field of research on next generation all-IP photonics telecommunication and Internet, as well as to make contribution on everyone’s modern style of living.
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Wu, Yi-Jung, e 巫宜融. "Route Optimization for Mobile IP with IP Header Extension". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/z239b8.
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碩士朝陽科技大學
資訊工程系碩士班
93
Due to coming of the mobile-commerce, a variety of portable electronic equipment has been produced, including PDA, notebook, and cellular phone, etc. Mobile IP has become an important protocol for providing Internet connectivity to roaming mobile hosts. However, several problems have been found in mobile IP and need to be solved. One of them is the triangle routing problem, in which all datagrams for a mobile host have to be routed first to the mobile host’s home agent and then forwarded by the home agent to the mobile host. These conventional paths are often significantly longer than optimal path. IETF (Internet Engineering Task Force) has proposed route optimization extensions in mobile IP to solve this problem. However the scheme has difficulties and is almost infeasible, because the scheme needs to implement a binding cache for all mobile hosts and correspondent nodes to solve the triangle routing problem. In this thesis, we propose a novel and simple route optimization scheme with IP header extension to solve the triangle routing problem in mobile IP, and to provide a feasible and efficient mobile IP service. Finally, we will conduct some simulation to prove that the proposed routing scheme outperforms the standard mobile IP.
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Cheng, Cyuan-Yuan, e 鄭全淵. "A Mobile TCP/IP Protocol for Mobile Computing". Thesis, 1996. http://ndltd.ncl.edu.tw/handle/89107006606730381431.
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碩士國立交通大學
資訊工程學系
84
There is a growing trend in developing the Internet (TCP/IP) application systems for it mobile computing environment. This paper describes the design of a mobile TCP/IP scheme that is compatible with the TCP/IP protocol suite and suitable for the mobile computing environment. The mobile TCP/IP scheme in this paper provides host mobility over local and wide area of the Internet network, and also proposes a two hierarchical infrastructure. In the two hierarchical infrastructure, there are two important components:region mobility gateway and mobility gateway. They can support more efficient routing scheme in mobile IP layer. and support packet error and lost recovery in mobile TCP layer. In addition, the mobility gateways are used as proxies for mobile hosts to provide transparent communication among mobile hosts. The performance analysis shows that the proposed mobile TCP/IP scheme is very effective.
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Tyan, Chyan-Chang, e 田乾昌. "Multicasting within Mobile-IP Environment". Thesis, 1997. http://ndltd.ncl.edu.tw/handle/94252015659629042915.
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碩士國立交通大學
資訊科學學系
86
Due to the popular of video conference, multicasting has become a very important function. However, the computing network does not support realmulticasting mechanism today. So the Multicast backBone (MBone) has become a virtual multicasting network that layers on top of portions of the physical Internet to support routing of IP multicast datagrams. On the other hand, people has not been constrained in a fixed place anymore for the convenience of traffic. To satisfy the mobility property, mobile environment is also urgent today. It is important to combine the multicasting with Mobile-IP environment. This thesis proposes a new method to support multicasting within Mobile-IP environment. Besides, this method also provides a better performance for such an environment.