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1
Kalaglarski, Boris Iv, and Geronimo Emilio Di. "IMS Interworking." Thesis, KTH, Kommunikationssystem, CoS, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-91992.
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The goal of this project was to analyze the IP Multimedia Subsystem (IMS) with respect to the interworking functionality between two or more IMS domains belonging to different operators. The thesis presents an overview of IMS, its purpose, the circumstances and the environment in which it has evolved, and a look into some of the challenges that lie ahead. Through careful examination of the history of the mobile communications and of IMS itself, the thesis attempts to give the reader a full and comprehendible understanding of what IMS is, what its purpose is, and why it came into existence. The thesis considers the different models of IMS interworking, as they are currently envisioned by the standardisation bodies and the telecom industry. This analysis aims to identify some of the problematic aspects of the IMS Interworking and to suggest concrete areas for further investigation, which will contribute to the future successful IMS development and deployment. The report looks into such aspects of IMS interworking as the DNS, different models for ENUM DNS resolution; security issues and technical challenges of security with respect to the network as a whole and some of the IMS network elements in particular, such as the DNS. This thesis also presents the findings of the authors, regarding the challenges of interworking between networks built to support different versions of the IP protocol. The thesis focuses on the areas of interest, mentioned above, as these have been identified as being of particular significance in connection with the further development of the IMS architecture.<br>Målet med denna uppsats var att analysera IP Multimedia Subsystem (IMS) med fokus på samverkan mellan två eller flera IMS domäner som tillhör olika operatörer. Examensjobbet beskriver en övergripande bild av IMS, dess målsättning, förhållanderna och miljön som den har utvecklats i och några utav utmaningarna som ligger framöver. Uppsatsen försöker med hjälp av bakgrundsfakta om mobiltelefonins historia ge läsarna förståelse om vad IMS är, syftet med det och varför det existerar. Uppsatsen beskriver olika samverkningsmodeller av IMS som grundar sig i modeller från de olika standardiseringsorganen samt från telecomindustrin. Målet med denna analys är att identifiera några problemaspekter samt presentera konkreta områden att fortsätta arbeta på gällande IMS och dess gällande samverkan mellan olika operatörer. Detta kan bidra till fortsatt framgång med utvecklingen samt utspridningen av IMS. Uppsatsen tar upp samverkningsproblem med IMS så som DNS, olika uppslagsmetoder av ENUM DNS, säkerhetsfrågor och säkerhetstekniska utmaningar med fokus på nätverket samt några IMS nätverkselement som DNS:en. Uppsatsen lägger också fram författarnas slutsatser gällande samverkan av de olika nätverken med olika versioner av IP protokollet. Examensjobbet fokuserar på de olika områderna som är ovan nämnda, då de har blivit identiferade med speciell betydelse för att kunna fortsätta att framgångsrikt utveckla IMS arkitekturen.
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Patel, Sanjiv Purushottamdas. "Multimedia fax-MIME interworking." Thesis, University of Ottawa (Canada), 1994. http://hdl.handle.net/10393/9702.
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In this thesis, the architecture of an application-level Internet-fax gateway to facilitate multimedia messaging and to extend Internet services to the home or office is presented. We propose the use of the latest developments in the facsimile and Internet worlds, notably BFT support for Group3 protocols and MIME, for the exchange of multimedia messages (documents) between both environments as well as providing Internet e-mail, file transfer and Internet news services to fax users. Such services would be of most benefit to Internet novices and those users who do not have access to Internet via dialup/SLIP or Freenet facilities. The gateway services would allow a smooth transition into the widespread proliferation of multimedia communications. Implementation of such a gateway would make multimedia at home a very practical reality. A remote printer server, whose functionality is a subset of the proposed multimedia fax-Internet gateway was configured and setup at the MCRLab. This server became operational on February 3, 1994 and covers the local calling areas of the Ottawa/Hull region. This exercise gave us better insight into the practical aspects of the Internet Remote Printing Experiment. Further, a demo for inbound multimedia messaging was developed using the Binary File Transfer extensions to CCITT Group3 facsimile. This prototype serves as a proof of concept for the proposed gateway services.
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Chang, Jing. "Transformation approaches to protocol interworking /." The Ohio State University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487759914757829.
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Gould, C. Brit (Christopher Britton). "Interworking public and private ATM networks." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/38797.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.<br>Includes bibliographical references (p. 125-128).<br>by C. Brit Gould.<br>M.Eng.
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Kraus, Edwin. "Interworking methodologies for DCOM and CORBA." [Johnson City, Tenn. : East Tennessee State University], 2003. http://etd-submit.etsu.edu/etd/theses/available/etd-1104103-205221/unrestricted/KrausE110503b.pdf.
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Thesis (M.S.)--East Tennessee State University, 2003.<br>Title from electronic submission form. ETSU ETD database URN: etd-1104103-205221. Includes bibliographical references. Also available via Internet at the UMI web site.
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Hayton, Richard. "An open architecture for secure interworking services." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313860.
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Munir, Arslan. "Analysis of interworking architectures for IP multimedia subsystem." Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/32112.
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The future fourth generation wireless heterogeneous networks aim to integrate various
wireless access technologies and to support the IMS (IP multimedia subsystem) sessions.
In the first part of this thesis, we propose the Loosely Coupled Satellite-Cellular-
WiMax-WLAN (LCSCW2) and the Tightly Coupled Satellite-Cellular-WiMax-WLAN
(TCSCW2) interworking architectures. The LCSCW2 and TCSCW2 architectures use
the loosely coupling and tightly coupling approach respectively and both of them integrate
the satellite networks, 3rd generation (3G) wireless networks, worldwide interoperability
for microwave access (WiMax), and wireless local area networks (WLANs). They can
support IMS sessions and provide global coverage. The LCSCW2 architecture facilitates
independent deployment and traffic engineering of various access networks. The TC-SCW2 aims to guarantee quality of service (QoS). We also propose an analytical model
to determine the associate cost for the signaling and data traffic for inter-system communication
in the LCSCW2 and TCSCW2 architectures. The cost analysis includes the
transmission, processing, and queueing costs at various entities. Numerical results are
presented for different arrival rates and session lengths. In the second part of this thesis,
the signaling flows for IMS registration, IMS session establishment and IMS session re-establishment procedure after undergoing a vertical handoff in a 4 G environment are
analyzed. Signaling delays are calculated for IMS signaling taking into account transmission,
processing and queueing delays at network entities. The proposed analysis of
the IMS signaling flows is independent of a particular access network technology and
interworking architecture and can be applied to any of the access network technology
and 4G interworking architecture.<br>Applied Science, Faculty of<br>Electrical and Computer Engineering, Department of<br>Graduate
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Akhtar, Nadeem. "Routing and interworking protocols for next generation wireless networks." Thesis, University of Surrey, 2007. http://epubs.surrey.ac.uk/2243/.
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Siebert, Matthias. "Interworking of wireless and mobile networks based on location information /." Aachen : Mainz, 2006. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=016147498&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
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Munasinghe, Kumudu S. "A Unified Mobility Management Architecture for Interworked Heterogeneous Mobile Networks." School of Electrical and Information Engineering, 2009. http://hdl.handle.net/2123/4063.
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Doctor of Philosophy (Ph.D.)<br>The buzzword of this decade has been convergence: the convergence of telecommunications, Internet, entertainment, and information technologies for the seamless provisioning of multimedia services across different network types. Thus the future Next Generation Mobile Network (NGMN) can be envisioned as a group of co-existing heterogeneous mobile data networking technologies sharing a common Internet Protocol (IP) based backbone. In such all-IP based heterogeneous networking environments, ongoing sessions from roaming users are subjected to frequent vertical handoffs across network boundaries. Therefore, ensuring uninterrupted service continuity during session handoffs requires successful mobility and session management mechanisms to be implemented in these participating access networks. Therefore, it is essential for a common interworking framework to be in place for ensuring seamless service continuity over dissimilar networks to enable a potential user to freely roam from one network to another. For the best of our knowledge, the need for a suitable unified mobility and session management framework for the NGMN has not been successfully addressed as yet. This can be seen as the primary motivation of this research. Therefore, the key objectives of this thesis can be stated as: To propose a mobility-aware novel architecture for interworking between heterogeneous mobile data networks To propose a framework for facilitating unified real-time session management (inclusive of session establishment and seamless session handoff) across these different networks. In order to achieve the above goals, an interworking architecture is designed by incorporating the IP Multimedia Subsystem (IMS) as the coupling mediator between dissipate mobile data networking technologies. Subsequently, two different mobility management frameworks are proposed and implemented over the initial interworking architectural design. The first mobility management framework is fully handled by the IMS at the Application Layer. This framework is primarily dependant on the IMS’s default session management protocol, which is the Session Initiation Protocol (SIP). The second framework is a combined method based on SIP and the Mobile IP (MIP) protocols, which is essentially operated at the Network Layer. An analytical model is derived for evaluating the proposed scheme for analyzing the network Quality of Service (QoS) metrics and measures involved in session mobility management for the proposed mobility management frameworks. More precisely, these analyzed QoS metrics include vertical handoff delay, transient packet loss, jitter, and signaling overhead/cost. The results of the QoS analysis indicates that a MIP-SIP based mobility management framework performs better than its predecessor, the Pure-SIP based mobility management method. Also, the analysis results indicate that the QoS performances for the investigated parameters are within acceptable levels for real-time VoIP conversations. An OPNET based simulation platform is also used for modeling the proposed mobility management frameworks. All simulated scenarios prove to be capable of performing successful VoIP session handoffs between dissimilar networks whilst maintaining acceptable QoS levels. Lastly, based on the findings, the contributions made by this thesis can be summarized as: The development of a novel framework for interworked heterogeneous mobile data networks in a NGMN environment. The final design conveniently enables 3G cellular technologies (such as the Universal Mobile Telecommunications Systems (UMTS) or Code Division Multiple Access 2000 (CDMA2000) type systems), Wireless Local Area Networking (WLAN) technologies, and Wireless Metropolitan Area Networking (WMAN) technologies (e.g., Broadband Wireless Access (BWA) systems such as WiMAX) to interwork under a common signaling platform. The introduction of a novel unified/centralized mobility and session management platform by exploiting the IMS as a universal coupling mediator for real-time session negotiation and management. This enables a roaming user to seamlessly handoff sessions between different heterogeneous networks. As secondary outcomes of this thesis, an analytical framework and an OPNET simulation framework are developed for analyzing vertical handoff performance. This OPNET simulation platform is suitable for commercial use.
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Munasinghe, Kumudu S. "A Unified Mobility Management Architecture for Interworked Heterogeneous Mobile Networks." Thesis, The University of Sydney, 2008. http://hdl.handle.net/2123/4063.
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The buzzword of this decade has been convergence: the convergence of telecommunications, Internet, entertainment, and information technologies for the seamless provisioning of multimedia services across different network types. Thus the future Next Generation Mobile Network (NGMN) can be envisioned as a group of co-existing heterogeneous mobile data networking technologies sharing a common Internet Protocol (IP) based backbone. In such all-IP based heterogeneous networking environments, ongoing sessions from roaming users are subjected to frequent vertical handoffs across network boundaries. Therefore, ensuring uninterrupted service continuity during session handoffs requires successful mobility and session management mechanisms to be implemented in these participating access networks. Therefore, it is essential for a common interworking framework to be in place for ensuring seamless service continuity over dissimilar networks to enable a potential user to freely roam from one network to another. For the best of our knowledge, the need for a suitable unified mobility and session management framework for the NGMN has not been successfully addressed as yet. This can be seen as the primary motivation of this research. Therefore, the key objectives of this thesis can be stated as: To propose a mobility-aware novel architecture for interworking between heterogeneous mobile data networks To propose a framework for facilitating unified real-time session management (inclusive of session establishment and seamless session handoff) across these different networks. In order to achieve the above goals, an interworking architecture is designed by incorporating the IP Multimedia Subsystem (IMS) as the coupling mediator between dissipate mobile data networking technologies. Subsequently, two different mobility management frameworks are proposed and implemented over the initial interworking architectural design. The first mobility management framework is fully handled by the IMS at the Application Layer. This framework is primarily dependant on the IMS’s default session management protocol, which is the Session Initiation Protocol (SIP). The second framework is a combined method based on SIP and the Mobile IP (MIP) protocols, which is essentially operated at the Network Layer. An analytical model is derived for evaluating the proposed scheme for analyzing the network Quality of Service (QoS) metrics and measures involved in session mobility management for the proposed mobility management frameworks. More precisely, these analyzed QoS metrics include vertical handoff delay, transient packet loss, jitter, and signaling overhead/cost. The results of the QoS analysis indicates that a MIP-SIP based mobility management framework performs better than its predecessor, the Pure-SIP based mobility management method. Also, the analysis results indicate that the QoS performances for the investigated parameters are within acceptable levels for real-time VoIP conversations. An OPNET based simulation platform is also used for modeling the proposed mobility management frameworks. All simulated scenarios prove to be capable of performing successful VoIP session handoffs between dissimilar networks whilst maintaining acceptable QoS levels. Lastly, based on the findings, the contributions made by this thesis can be summarized as: The development of a novel framework for interworked heterogeneous mobile data networks in a NGMN environment. The final design conveniently enables 3G cellular technologies (such as the Universal Mobile Telecommunications Systems (UMTS) or Code Division Multiple Access 2000 (CDMA2000) type systems), Wireless Local Area Networking (WLAN) technologies, and Wireless Metropolitan Area Networking (WMAN) technologies (e.g., Broadband Wireless Access (BWA) systems such as WiMAX) to interwork under a common signaling platform. The introduction of a novel unified/centralized mobility and session management platform by exploiting the IMS as a universal coupling mediator for real-time session negotiation and management. This enables a roaming user to seamlessly handoff sessions between different heterogeneous networks. As secondary outcomes of this thesis, an analytical framework and an OPNET simulation framework are developed for analyzing vertical handoff performance. This OPNET simulation platform is suitable for commercial use.
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Stipidis, Elias. "ATM networks : traffic control, interworking with CAN, and end station NIC architecture." Thesis, University of Sussex, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263208.
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Ransbottom, J. Scot. "Mobile Wireless System Interworking with 3G and Packet Aggregation for Wireless LAN." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/27122.
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This research considered the efficient transmission of data within a wireless local area network (WLAN) system. A simulation model was developed to study the performance of our protocol, AGG-MAC (aggregated medium access control). AGG-MAC is a simple and elegant medium access control (MAC) protocol designed to improve performance by transmitting a maximal quantity of data with minimal overhead. Our enhancement to IEEE 802.11, AGG-MAC yields dramatic improvements in both local and global throughput. It furthermore reduces jitter in support of real time communications requirements such as voice over IP (VoIP). In support of heterogeneous roaming between Third Generation (3G) Wideband CDMA (WCDMA), specifically Universal Mobile Telecommunications System (UMTS) and WLAN systems, we constructed a simulation environment which allowed the evaluation of AGG-MAC in such a system. We further demonstrated the suitability of AGG-MAC throughout a range of infrastructure and ad hoc based WLAN scenarios. The AGG-MAC protocol enhancement provides significant performance improvements across a range of wireless applications, while interoperating with standard IEEE 802.11 stations. Performance is commensurate to original WLAN MAC performance for applications that do not benefit from packet level aggregation.
<P>
The key contributions of this research were two-fold. First was the development of an OPNET simulation environment suitable for evaluation of future protocols supporting tightly coupled, heterogeneous WLAN and 3G systems. Secondly was the implementation and testing of the AGG-MAC protocol which aggregates suboptimal size packets together into a single frame, thereby amortizing the overhead.<br>Ph. D.
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Doble, James Carleton University Dissertation Engineering Electrical. "Distribution of protocol functions in an interworking-based ISDN switching node implementation." Ottawa, 1988.
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Mann, Tracy L. "A Network System Level Simulator for Investigating the Interworking of Wireless LAN and 3G Mobile Systems." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/31868.
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Recent research supports the eventual convergence of wireless LAN (WLAN) and cellular systems in order to achieve the IMT-2000 (3G) requirement for 2 Mbps indoor capacities. The WLAN access point can be enhanced to either incorporate or supplant the transmission and packet data capabilities in the cellular network. This research used OPNETâ ¢ to design, implement, and test a network system level simulation environment to allow investigators to study the issues and trade-offs for interworking the infrastructure-based WLAN technologies into 3G mobile subscriber cellular systems. The specific contribution of this research was to augment the current OPNETâ ¢ model library by creating an enhanced user equipment node (UW) and an enhanced WLAN access point node (UWLAN_AP).
The UW was augmented with the capability to selectively gain network access through either a UMTS Node-B or through a 3G-aware WLAN access point. The UWLAN_AP was made 3G-aware by augmenting it with the capability to process UMTS control messages in order to build an access control table to support UMTS authentication and access control. Together, the UW and UWLAN_AP create a simulation framework for interworking the WLAN technology into UMTS as an alternate radio access network for supporting â hot spots.â This research is the foundation to allow investigators to identify signaling and data transfer mechanisms that leverage the capabilities of WLAN while supporting cellular service provisioning and accountability requirements for current and future systems.<br>Master of Science
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Valdenebro, González Fernando. "Energy-efficient enhancements for IEEE 802.11 WLANs : On the way to enable Cellular/Wi-Fi networks interworking." Thesis, KTH, Radio Systems Laboratory (RS Lab), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-142357.
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Globally, the number of mobile broadband subscriptions is growing and the amount of mobile data traffic is expected to continue to grow rapidly. In the next five years the number of smartphone subscriptions is expected to more than double, while the amount of mobile traffic per active subscription per month of these subscribers is expected to nearly quadruple. As a consequence, mobile network operators (MNOs) aim to increase radio network capacity and coverage through heterogeneous deployments. In such heterogeneous networks, wireless local area networks (WLANs) are integrated with wireless wide area networks (WWANs), and there exist a tight interaction between them. The almost-ubiquitous support for IEEE802.11 WLANs (usually referred to as Wi-Fi®) makes this radio access technology a potential integrated component of near-future mobile broadband. With Wi-Fi completely integrated into mobile access, MNOs would optimize user experience and use of resources by controlling device’s choice of connectivity. In addition to guaranteeing the best user experience, optimal use of access networks should care about energy-efficiency in order to extend device’s battery life. However, the performance of Wi-Fi is far from meet neither energy-efficiency nor quality of service (QoS) user’s requirements. This radio access technology employs an energy-consuming medium access control (MAC) protocol that wastes both bandwidth and device’s energy resources. Therefore, enhanced MAC protocols, cleverly combined with standardized power saving mechanisms such as automatic power save delivery (APSD), would improve both energy-efficiency and QoS in order to enhance WLANs performance and meet user’s expectations. In addition, current WLAN discovery mechanisms neither meet requirements of the integrated scenario. Handover operations must be improved in terms of energy efficiency and latency. Consequently, enhanced handover schemes should reduce overall device’s energy consumption during the process, and enable seamless handover between Wi-Fi APs and between cellular/Wi-Fi networks. During this thesis project, the main challenges of Wi-Fi towards its integration into mobile access broadband have been analyzed. Consequently, a solution has been designed in order to address the identified challenges, which have been introduced in the previous paragraphs. The solution consists of enhancements for IEEE 802.11 WLANs based on current standards that achieve energy-efficiency and QoS, and facilitate Wi-Fi/cellular networks interworking. Finally, a custom-designed simulator has been used to evaluate the proposed solution.<br>Globalt sett är antalet mobila bredbandsabonnemang ökar och mängden av mobil datatrafik förväntas fortsätta att växa snabbt. Under de kommande fem åren kommer antalet smartphone-abonnemang väntas mer än fördubblas, medan mängden av mobiltrafiken per aktiv prenumeration per månad för dessa abonnenter väntas nästan fyrdubbla. Som en följd av mobiloperatörer som mål att öka sin radio nätkapacitet och täckning genom heterogena distributioner. I sådana heterogena nätverk, är trådlösa lokala nätverk (WLAN) integrerad med trådlösa WAN-nätverk (WWAN), och det finns en tät interaktion mellan dem. För att möta denna efterfrågan ämnar operatörer av mobila nätverk att öka kapacitet och täckning genom att bygga ut heterogena nätverk. I sådana heterogena nätverk integreras trådlösa lokala nätverk (WLAN) med nätverk med större yttäckning (cellulära nät) med täta interaktioner mellan de olika näten. Det mycket utbredda stödet för IEEE 802.11-standarden (ofta kallad för Wi-Fi®) för WLAN gör denna radioaccessteknik till en potentiell integrerad komponent för mobilt bredband i den nära framtiden. Med Wi-Fi som en integrerad i det mobila accessnätet kan mobilnätsoperatörer optimera användarupplevelsen och resursanvädningen genom att styra de mobila enheternas val av uppkoppling. Förutom att garantera den bästa användarupplevelsen så bör valet av accessnät ta hänsyn till energieffektiviteten för att förlänga batteridrifttiden för den mobila enheten. Wi-Fi är dock långt ifrån att uppfylla användarnas krav på energieffektivitet och tjänstekvalitet, eftersom denna radioaccessteknik använder ett mediumaccessprotokoll (MAC) som varken använder bandbredd eller batterienergi effektivt. Därför kan förbättrade MAC-protokoll kombinerade med standardiserade energibesparingslösningar såsom automatic power save delivery (APSD) ge bättre energieffektivitet och tjänstekvalitet, och därmed förbättra WLANs möjligheter att möta användarnas förväntningar. Dessutom har nuvarande nätverksidentifieringsmekanismer i WLAN svårt att uppfylla kraven i ett scenario med integrerade nätverk, eftersom den nuvarande sökmetoden är långsam och använder mycket energi. En förbättrad lösning bör minska energikonsumtionen under hela processen, och möjliggöra avbrottsfri övergång mellan Wi-Fi accessnoder och mellan cellulära och Wi-Fi-nätverk. Under detta examensarbete har de största utmaningarna för Wi-Fi under integrationen med mobil bredbandsaccess analyserats. En lösning har utvecklats för att lösa de identifierade problemen som beskrivits ovan. Lösningen består av förbättringar av IEEE 802.11 accessnät, som bygger vidare på existerande standardens energieffektivitets- och tjänstekvalitetslösningar och underlättar samverkan mellan Wi-Fi och cellulära nätverk. Slutligen har en egenutvecklad simulator använts för att utvärdera den föreslagna lösningen.
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Ali, Yahiya Tara. "Approches inter-couches pour l'allocation de ressources dans les réseaux WiMAX mobiles." Paris 6, 2008. http://www.theses.fr/2008PA066101.
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Les progrès récents des techniques de communication et des réseaux sans fil ont permis le déploiement réussi de plusieurs systèmes tels que Bluetooth, Wifi, GSM/UMTS ou encore DVB-S. L’émergence de la technique WiMAX mobile IEEE 802. 16e vise à compléter cette panoplie. Par conséquent, l’interopérabilité de l’ensemble de ces solutions permettra d’offrir à un nœud mobile équipé de plusieurs cartes réseau une couverture universelle (on parle d’ubiquité) et l’accès à une large palette d’applications à bande passante variable et QoS garantie. Néanmoins, l’intégration de réseaux hétérogènes pose de nombreux défis en particulier en ce qui concerne la coordination des mécanismes de qualité de service et les stratégies d’adaptation de contenus. Cela est particulièrement dû au découpage des systèmes traditionnels en couches dans lesquels de nombreux niveaux sont découplés et sont supposés être aussi indépendants que possible. Ces séparations en nombreux niveaux rendent problématiques dans la pratique l’intégration de services variés dans des réseaux hétérogènes. Dans ces réseaux, le trafic est protéiforme avec des paramètres de qualité de service distincts, les canaux de communications et les conditions environnementales peuvent énormément fluctuer à des échelles de temps très courtes, et le déplacement même des utilisateurs peut être très imprévisible. L’ensemble de ces fluctuations impose le déploiement de protocoles adaptatifs. Cela pousse à mettre en place des solutions inter-couches ou cross-layer où des niveaux non adjacents peuvent communiquer pour essayer d’exploiter au mieux cette dynamicité. Dans cette thèse, nous nous sommes tout d’abord focalisés sur l’allocation de ressources et sur l’ordonnancement dans les réseaux WiMAX mobiles en utilisant des techniques d’optimisation conjointe de niveau couche physique et couche accès (MAC). Au travers de notre solution qui permet de tenir compte du niveau de satisfaction des nœuds mobiles pour un niveau d’allocation donné, nous proposons un cadre cross-layer pour l’allocation des ressources dans un réseau WiMAX mobile reposant sur l’OFDMA. Nous proposons alors une technique d’ordonnancement intitulée CACBQ qui tiendra simultanément compte de la qualité du support et de l’état des files d’attente. Cette technique permet d’améliorer l’efficacité spectrale tout en respectant la qualité de service attendue par les applications. Par ailleurs, nous introduisons un cadre cross-layer pour l’intégration des réseaux Wifi et WiMAX mobiles. Nous avons pris essentiellement en considération les problèmes liés à l’adaptation des protocoles, la mise en correspondance des services, le provisionnement pour la QoS et l’allocation des ressources. Nous proposons un schéma de gestion des ressources qui inclut l’ordonnancement de trafic et l’admission de connexion en se fondant sur l’utilisation courante de la ressource radio et qui contrôle la quantité de ressources utilisées par les stations mobiles qui ont été déplacées du réseau WiMAX vers le réseau Wifi.
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Chen, Liang. "Survey of Mobile Communication Systems and Handover." Thesis, Linköping University, Department of Electrical Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-12002.
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<p>After more than two decades’ development, modern mobile cellular networks now have almost approached to the commercial level of fourth generation communication networks. For each of the mobile solutions, there are special attributes but also similarities compared to the other competitive solutions. We can also find relationships between the old generation solutions and the inheritors or innovations.</p><p>During the communicating session using any kind of existing mobile handset, the handover procedure is a very important one that may effect connection quality and also the phone call continuity. Nowadays, the mobile cellular networks have a trend to interact with LAN networks. They will co-exist and work together to support higher data rate over a wider coverage. Seamless handover proposals like Unlicensed Mobile Access (UMA) can support the heterogeneous handover between Global System for Mobile Communications (GSM) and Wireless (Wi-Fi) Network. Several Media Independent Handover (MIH) proposals can handle the vertical handover in the hybrid mobile data network environment such like between wireless local area network (WLAN) and Universal Mobile Telecommunications System (UMTS) by different solutions.</p>
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Peyman, Talebifard. "Integration of heterogeneous wireless access networks with IP multimedia subsystem." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/2893.
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Next generation heterogeneous wireless networks are expected to interwork with Internet Protocol (IP)-based infrastructures. Conventional network services operate like silos in that a specific set of services are offered over a specific type of access network. As access networks evolve to provide IP-based packet access, it becomes attractive to break these “service silos” by offering a converged set of IP-based services to users who may access these services using a number of alternative access networks. This trend has started with third generation cellular mobile networks, which have standardized on the use of the IP Multimedia Subsystem (IMS) to manage user access to a wide variety of multimedia services over the mobile Internet, while facilitating interworking of heterogeneous wireless and landline access networks.
The future users of communication systems will subscribe to both IP-based and Circuit Switched (CS) based services and in the foreseeable future a single database that handles user profiles across all domains will be required. Home Subscriber Server (HSS) as an evolved version of Home Location Register (HLR) is one of the key components of IMS. In deploying HSS as a central repository database, in a fully overlapped heterogeneous network setting, changes of access mode are very frequent and conveying this information to HSS imposes excessive signaling load and delay. In our proposed scheme we introduce an Interface Agent (IA) for each location area that caches the location and information about the access mode through which a user can be reached. This method results in significant amount of savings in signaling cost and better delay performance.
The existing call delivery approaches in cellular networks may not be well suited for future communication systems because they suffer from unnecessary usage of network resources for call attempts that may fail which adds to excessive signaling delays and queuing costs. Reducing the number of queries and retrievals from the database will have a significant impact on the network performance. We present a new scheme based on Reverse Virtual Call setup (RVC) as a solution to the call delivery problem in heterogeneous wireless networks and evaluate the performance of this framework.
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Hsieh, Hung-Yun. "Addressing Network Heterogeneity and Bandwidth Scarcity in Future Wireless Data Networks." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5063.
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To provide mobile hosts with seamless and broadband wireless Internet access, two fundamental problems that need to be tackled in wireless networking are transparently supporting host mobility and effectively utilizing wireless bandwidth. The increasing heterogeneity of wireless networks and the proliferation of wireless devices, however, severely expose the limitations of the paradigms adopted by existing solutions. In this work, we explore new research directions for addressing network heterogeneity and bandwidth scarcity in future wireless data networks. In addressing network heterogeneity, we motivate a transport layer solution for transparent mobility support across heterogeneous wireless networks. We establish parallelism and transpositionality as two fundamental principles to be incorporated in designing such a transport layer solution. In addressing bandwidth scarcity, we motivate a cooperative wireless network model for scalable bandwidth utilization with wireless user population. We establish base station assistance and multi-homed peer relay as two fundamental principles to be incorporated in designing such a cooperative wireless network model. We present instantiations based on the established principles respectively, and demonstrate their performance and functionality gains through theoretic analysis, packet simulation, and testbed emulation.
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Kassar-Ben, Jemaa Meriem. "Gestion du handover vertical dans les réseaux sans fil hétérogènes." Paris 6, 2009. http://www.theses.fr/2009PA066742.
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Cette thèse se base sur le besoin pour un utilisateur mobile d'accéder à ses services IP en tout lieu, à tout moment et de la meilleure manière possible (ABC, Always Best Connected). Elle étudie une architecture d'Interworking 3G/UMTS-WLAN en couplage loose pour faire coopérer des réseaux sans fil hétérogènes. Cette architecture, prouvée par sa faisabilité et sa simplicité, se base sur le protocole Mobile IP afin de gérer la mobilité des utilisateurs pour une continuité de service. Cette thèse propose un schéma de gestion du handover contrôlé par le mobile que nous intégrons à l'architecture d'Interworking dans un contexte multi-opérateurs en collaboration, répondant aux besoins des utilisateurs mobiles d'une part, et assurant la continuité de service d'autre part. Ce schéma, efficace et intelligent, collecte les informations nécessaires, décide du besoin d'initier le handover en temps opportun à l’aide d’un système de logique floue, choisit le réseau le plus approprié parmi les réseaux d'accès hétérogènes disponibles à l’aide d’un processus AHP (Analytic Hierarchy Process). Pour une solution de type seamless, la procédure d'exécution du handover, basée sur une combinaison Mobile IP-AAA, est préparée grâce à la stratégie élaborée de la décision du handover au niveau du terminal mobile
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Ylianttila, M. (Mika). "Vertical handoff and mobility — system architecture and transition analysis." Doctoral thesis, University of Oulu, 2005. http://urn.fi/urn:isbn:9514276922.
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Abstract
The contemporary information age is equipped with rich and affordable telecommunication services. In the future, people have even more flexibility when true wireless Internet and real-time multimedia are provided seamlessly over heterogeneous wireless networks. Optimally combining the capacity and services of the current and emerging networks requires a holistic view of mobility, resource and service management. This thesis contributes to the research and development of these hybrid systems with three main contributions.
Firstly, a system architecture for vertical handoff in location-aware heterogeneous wireless networks is proposed. The proposed architecture enables the mobile node to prepare for approaching vertical handoffs and wake-up a hotspot interface. The needed communication procedures are discussed, and inter-related issues of mobility and geolocation information are considered in proportion to usability, advantages and limitations.
Secondly, a framework for the analysis of vertical handoff algorithm sensitivity to various mobility parameters including velocity, handoff delay and dwell time is introduced. Handoff smoothing with a dwell-timer is analyzed as one potential scheme for optimizing vertical handoff locally. It is compared to a power based algorithm to find out its sensitivity to the changes in effective data rates, velocity of the terminal and the amount of handoff delay. The analysis focuses on the transition region, having case studies on both moving-in and moving-out scenarios. An optimal value for dwell-timer is found through simulations, showing a performance gain over power based algorithm as a function of mean throughput. The analysis is extended also to a multiple network scenario.
Thirdly, experimental results on the behaviour of protocols used in wireless IP networks are presented. Prototype systems demonstrate results of using Mobile IP with a fuzzy logic algorithm for vertical handoff in a heterogeneous network environment and the role of IPv6 when using a voice application in a wireless LAN environment. Latest contributions include developing plug-and-play middleware functionalities for Symbian mobile devices, extending the use of the earlier results to state-of-the-art mobile devices.
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Smith, Glenn. "Conciliation : the adaptation of independently developed software components." Thesis, Queensland University of Technology, 1999.
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Yang, Chih-Hao, and 楊志豪. "WiMAX and HSDPA Interworking Mechanism." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/28405408995588668196.
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碩士<br>國立臺灣科技大學<br>電子工程系<br>96<br>This thesis presented a set of comprehensive interworking mechanisms between WiMAX (World Interoperability for Microwave Access) and HSDPA (High Speed Downlink Packet Access) to fulfill the integration and development of latest wireless broadband data service. The proposed interworking mechanisms comprise: WiMAX-HSDPA interworking architecture, QoS (Quality of Service) guarantee mechanism, as well as handover trigger module (HTM).
This thesis first introduced an interworking architecture which complied with both HSDPA and WiMAX standards. Based on this architecture, we recommended a QoS guarantee mechanism i.e. “WiMAX-HSDPA service aware QoS mapping” (WHSAQM) to assure the QoS continuity between these two networks during handover. Furthermore, the HTM which consists of network connection management, pre-registration, signal monitoring and handover trigger mechanisms support to reply the network and radio channel status promptly to minimize the potential service degradation and handover interruption. Eventually, field tests are performed to verify the key performance indicators (KPIs) of services and the feasibility of the recommended mechanisms.
After verification in the field test, all the services can be seamlessly handover between these two networks, and the QoS requirement of services can be guaranteed. While the WiMAX spectrum had just been released by some countries, this thesis provides a feasible interworking solution for those existing cellular operators or green-field operators who have plans to implement the WiMAX and HSDPA in the future.
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Lee, Ji-Huang, and 李吉晃. "VoIP Interworking and Supplementary Services." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/58235609850467515137.
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碩士<br>國立交通大學<br>資訊工程系<br>90<br>As the widespread of the Internet, utilizing the Internet as a bearer to transport voice traffic becomes more and more popular. Internet telephony offers a number of advantages over the traditional circuit-switching network, such as lower cost, easy to implement services, integration of voice and data applications. There are several Voice over Internet Protocol (VoIP) standards proposed, including H.323 proposed by International Telecommunication Union (ITU), Session Initiation Protocol (SIP) proposed by Internet Engineering Task Force (IETF), Media Gateway Control Protocol (MGCP), and MEGACO proposed by IETF and ITU. These approaches have their own advantages and limitations. It is critical to provide a mechanism to enable communication between different protocols and networks.
In this thesis, we propose an interworking architecture. The interworking function is a collection of finite state machines in a call agent, and it can convert the signaling of different protocols. To balance the load of call agents, SIP is used as the signaling protocol between call agents. We also propose a mechanism to provide supplementary services. We implement the design on a VoIP platform to demonstrate the feasibility of the architecture.
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"Interworking Methodologies for DCOM and CORBA." East Tennessee State University, 2003. http://etd-submit.etsu.edu/etd/theses/available/etd-1104103-205221/.
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Tsou, Yi Ting, and 鄒禕庭. "A Study of Interworking 3G/WLAN Authentication." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/14625322366533692163.
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碩士<br>長庚大學<br>資訊管理學研究所<br>97<br>With the constant improvement of internet technology, people have higher and higher expectations for internet and the mobile devices. PDA phone is often used to check e-mail and to download music and video. A great amount of packets transmitting on the internet when using these internet and mobile devices, therefore an uninterrupted high speed and a secure mechanism are necessary to satisfy the users.
The thesis proposes a study focusing on the integration of 3rd generation (3G) and Wireless Local Area Network (WLAN) authentication mechanisms, indicates 3G as Universal Mobile Telecommunications System (UMTS), and uses EAP-TTLS to protect user’s International Mobile Subscriber Identity (IMSI) in cipher text. In addition, the thesis uses Inter Access Point Protocol (IAPP) and pre-registration mechanism to improve the seamlessly handoff between old Access Point (AP) and new AP, to prevent the lost of users’ information and AP’s malicious invasion, and to decrease the whole handoff time. Lastly, the thesis also takes the mobile equipment’s computation ability into consideration to analyze the efficiency, including the computation times and execution time. The proposed method emphasizes the authentication, transmission security and fast handoff between APs to let users enjoy the convenience of 3G and WLAN.
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Lu, Rui-Hong, and 呂瑞鴻. "LAN and Frame Relay Interworking Unit Design." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/50812718312709758126.
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碩士<br>國立中正大學<br>電機工程學系<br>85<br>Abstract Ethernet is a very popular local area network with
large installation base, however two remote LANs can not
communicate with each other due to long distance.Communication
between LANs must go through the wide area network(WAN), and
interwoking unit(IWU) is required to interconnect LAN with WAN.
In WAN, Frame Relay is a commonly used protocol operating up to
the sublayer of data link layer in OSI reference model.The
protocol overhead of frame relay is low, and higher throughput
than traditional X.25 protocol can be achieved. The
transmission rate for the designed Frame Relay interworking unit
is set at 64kbps, which is a fractional T1 rate. Higher rate
can also be implemented in the future. The interwoking
unit is implemented by an embedded microprocessor, MOTOROLA
MC68302. It provides a serial communication channel to transfer
frame relay data frame in HDLC mode. The LAN controller is a
DP83934 SONIC(System Oriented Network Interface Controller) from
National semiconductor , Inc ,, it handles the Ethernet LAN
functions and supports bridge applications. This thesis
concentrates on the firmware of LAN driver, and data transfer
between Frame relay LAPD module and LAN module.
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Qin, Jingsheng. "Interworking of TCAP/SS7 and TCP/IP networks." 2002. http://hdl.handle.net/1993/19707.
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Yen, Ka-Chin, and 嚴克勤. "Transparent Bridging Support for Bluetooth-IP Service Interworking." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/03609787977378629426.
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碩士<br>國立東華大學<br>資訊工程學系<br>90<br>In recent years, the wireless communications have become a focus of much research and development. Many wireless network technologies have been developed such as the IEEE 802.11 series and the Bluetooth. The Bluetooth technology is based on the ad-hoc network architecture. The Bluetooth network is formed spontaneously without any pre-configuration. Two Bluetooth devices can establish a connection to build a small network named Piconet. A Piconet has maximum eight devices including one “Master” and seven “Slave”. The “Master” device has the ability to control and coordinate the operations of the Piconet.
In the current network world, the IP-based network as the Ethernet has become the most popular network style. Most services are developed very completely over the Internet. To let Bluetooth device retrieve the services of the Internet, a Bluetooth-IP gateway is needed because of the isolation of a Piconet. The Bluetooth specification has defined the LAN access profile and the PAN profile. The LAN access profile using the IETF Point-to-Point Protocol (PPP) and the PAN profile using the Bluetoooth Network Encapsulation Protocol (BNEP).
A PC-based transparent gateway for interconnecting Bluetooth Piconet and IP local area networks (LAN) was designed in our research. The essential function of this designed Bluetooth-IP gateway is to achieve a seamless integration among home appliances, networking elements and multi-systems using the Address Resolution Protocol (ARP) and connection management scheme. The key techniques developed, as well as the performance analysis in terms of queue length, loss rate, throughput and transmission delay are explored in this research.
In the Queue Length analysis, The Gateway queue length is in the direct proportion with the size of the traffic flow. In the Loss Rate analysis, the Loss rate decreases when the Gateway queue length increasing, but it becomes stable when the Gateway queue length reaches the specified value. In the Throughput analysis, the Gateway queue length has no effect to the throughput of the gateway. In the Delay analysis, the Delay increases when the Gateway queue length increasing, but it becomes stable when the Gateway queue length reaches the specified value. Moreover, the implementation issues are also discussed in the thesis. We believed that the gateway has solved the problem of the interconnection of Bluetooth Piconet and LAN.
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Yeh, I.-Chin, and 葉一均. "The Mobility Management and Interworking of VoIP Protocols." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/50137318119760051252.
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碩士<br>國立交通大學<br>資訊工程系<br>89<br>IP telephony provides new service for real-time data/voice communication on the Internet, which lowers the cost and potentially offers more convenience to the users. A number of VoIP protocols have been developed to harvest the advantages. One of the main issues of the IP telephony is how to integrate the VoIP protocols.
VoIP standards for Internet telephone calls include H.323, SIP and MGCP. MGCP provides an interface between the PSTN and the Internet. An interworking function between MGCP and other VoIP protocols can lead to the interworking between the VoIP protocols and the PSTN. Moreover, the interworking between SIP and H.323 is also proposed to allow SIP user agent to call H.323 terminals, and vice versa. The integration of these interworking functionalities leads to a converged network of the Internet, PSTN, and even the cellular phone network.
In this thesis, we present an architecture for the converged network. The architecture MGCP-SIP interworking function, SIP-H.323 interworking function, and an hierarchical user location database to support user mobility across various VoIP domains. Wherever a user moves, others can communicate with the user using the user’s public ID. We also describe how the handoff can be performed across the different domain networks using two methods, “call join” and “call transfer”. In this situation, we assume that the mobile terminal has the functionality that can change into other protocols.
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YU, Sheng-Wang, and 余聲旺. "Research on Interworking of High Speed Heterogeneous Networks." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/46540704237593339741.
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博士<br>國立台灣工業技術學院<br>電機工程技術研究所<br>85<br>High speed communication networks are strongly demanded. Among
these networks, Frame relay and Asynchronous Transfer Mode (ATM)
networks are the two most respected, high speed networks. The
interworking between these two networks is foreseen in the near
future. In the heterogeneous network interworking environment,
an interworking unit (IWU) is generally interposed between these
networks to perform the essential protocol conversions. The
architectural issues, channel multiplexing schemes and data
processing issues of IWU are identified and addressed. The data
processing issues, including frame processing schemes, frame
shaping schemes, and cell processing schemes, are evaluated via
simulation experiments. Furthermore, Connectionless (CL) data
service is expected to be one of the most important applications
for FR/ATM interworking, but current interworking protocol
structure can not be employed to provide CL service in an
economical fashion. We propose an enhanced protocol stack on IWU
and a communication structure. In this way, FR can interoperate
with the CLS network overlaid on the ATM network, reducing the
logical channel consumption. The future prospective VPN should
provide flexibility, scalability, mobility, and cost-efficiency.
To provide emerging VPN service in the interworking environment,
we address the addressing, routing, and multicasting issues and
propose the server-integrated solution for VPN construction. For
providing SVC service over VPN, we propose the address mapping
schemes, which ensures a direct cut-through connection to be
setup. Compared with the original VPN service, not only our
proposed VPN can reduce the required channel numbers and
simplify network management, but also it produces the cost-
effective benefit.
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Lin, Chia-Hsing, and 林嘉興. "Analysis of Interworking Unit between LAN and ATM." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/62761520327098989820.
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Kuo, Bo-Lin, and 郭柏琳. "The Design and Implement of Heterogeneous VoIP Interworking System." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/31248097408041030972.
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碩士<br>國立雲林科技大學<br>資訊管理系碩士班<br>94<br>Recently, according to great progressing of the information technology on Internet, so people can communication with everyone by various technologies. The technologies include e-mail, instant message, VoIP.
There are many communication protocols used for VoIP, and different VoIP protocols can’t communicate with each other. Therefore, if we want to set a phone call with another user who is use a different VoIP protocol, we must be install the application which is the same as the Callee. MSN and Yahoo jointly announced that they are setting up interoperability between their previously separate MSN Messenger and Yahoo Messenger global instant messaging communities and instant voice communities. Logging on to either MSN Messenger or Yahoo Messenger will enable a user to engage in IM sessions with registered users of both communities. The VoIP interworking has became a trend, so it’s important to make all the VoIP applications can communicate with each other. Now the most popular VoIP application is SIP and Skype. Therefore, this research will propose an intermediate concept of VoIP interworking system and to implement this system to make SIP and Skype can communicate with each other.
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Chiu, Yi-Chia, and 邱怡嘉. "Interworking Design and Analysis of VPLS Interconnecting SPB Networks." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/41377452038521368939.
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碩士<br>國立中正大學<br>通訊工程研究所<br>102<br>The new generation of data center is confronted with the growing numbers of virtual servers, services virtualization, mobility of virtual machine, and management issues. Data centers that adopt traditional LAN or WAN design face challenges like insufficient numbers of VLAN, limited transmission distance, etc.
Shortest Path Bridging (SPB) is the IEEE-sanctioned large-scale layer 2 network technology, which is suitable for next generation cloud data center. This thesis proposes two methods, that allow SPBM（SPB MAC-in-MAC) services to penetrate VPLS Core Network. The first method allows MPLS-encapsulated SPBM data frames to maintain B-MAC, B-VID and I-SID fields in its header. The second method allows MPLS-encapsulated SPBM data frames to keep B-MAC field, while stripping off the B-VID, and I-SID fields. The difference between these two methods is the higher data plane overhead but easier design of control plane in the first method than that in the second method. The two proposed methods to interconnect VPLS and SPB enable SPBM services to penetratie VPLS Core Network. Each participating SPBM network segment owns complete topology information. Each SPBM segment knows members of supported service instances (I-SID), the B-VIDs an I-SID uses and members’s backbone network B-MAC address, B-MAC.
The benefits of the proposed methods include: enabling load balancing and traffic engineering over the entire interconnected network through the use of multiple equal cost tree（ECT) routing, allowing an single I-SID to use multiple B-VIDs, multi-path selection inside the MPLS core network, using MAC-in-MAC to reduce MAC learning table size, increased mobility of virtual machines（VM Mobility).
Key words ： SPB, data plane, control plane, I-SID member, VPLS, ECMT, VM mobility.
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Jang, Chang-Bu, and 簡千卜. "A Secure Authentication Policy for UMTS and WLAN Interworking." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/76021941740968499210.
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碩士<br>國立中興大學<br>電機工程學系<br>93<br>We propose a security authentication policy, Dynamic Session Key Policy (DSKP), for a secure handoff between the UMTS and IEEE 802.11 WLAN. This policy is founded and improved from DKEP (Dynamic Key Exchange Protocol). It redeems the confidentiality of the communication association using the asymmetric and symmetric encryption. The exposed data in DSKP are fixed and useless for the enemy. The one time password system is used for the key exchange of the sessions. The transition of the communication states in DSKP are seamless and cannot be personated. From the security analysis using the security requirements of the 3G mobile communication system and the security claims of the IEEE 802.11 WLAN, DSKP can avoid possible attack in wireless circumstance. DSKP is also compared with the EAP-SIM and EAP-AKA, which are used commonly as the authentication protocol in the present WLAN. From our analysis, DSKP gets better security grades.
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Wong, Terrence Sui Wing. "An ATM-based interworking architecture for wireless personal communications." Thesis, 1996. http://hdl.handle.net/2429/5759.
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The growing demand for mobile communication services as well as technological
advances drive the new generation of Personal Communication Networks (PCNs). New or modified
networks and communication protocols are required to support associated Personal communication
Services (PCS).
An ATM-based architecture has been proposed to support future PCS. The network would
provide improved PCS performance for applications such as hand-off and call set up. CDMA
technology is assumed as the air interface, with a bandwidth in each cell site of 2.5 MHz and a
sectorization antenna with 3 sectors/cell. The PCS radio cell coverage size varies depending on
geographic location; radii of 275 m and 981 m are proposed for microcells in metropolitan and
urban areas, respectively. The topology of the proposed network is a star configuration which connects
the base stations (BS) to the mobile switching centre (MSC). The proposed network which
interconnects 16 switching centers can support up to 3.0 million potential PCS users with a coverage
of 600 Km2 in metropolitan area.
Strategies such as fast hand-off routing and signalling schemes are presented based on the
virtual connection tree concept. Radio cells with a 50 percent overlapping area for improving
hand-off performance are considered. Radio cell radii are calculated in different environments
with various market penetrations. Cell site overload probability for voice and data users within a
connection tree region is studied. Network performance in terms of end-to-end delay, cell delay
variation, and buffer occupancy are investigated in depth.
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Chen, Chi-Chung, and 陳啟中. "A Fast Authentication Mechanism for WiFi-WiMAX Interworking System." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/28352776648395096496.
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碩士<br>國立交通大學<br>資訊學院碩士在職專班資訊組<br>99<br>Several solutions in the literature have been proposed to reduce the lengthy inter-system handover delay due to a full EAP authentication. In this thesis, a fast authentication mechanism (FAM) is proposed for the WiFi-WiMAX interworking system to support both target prediction hit and prediction miss handling. As a result, the full EAP authentication procedure is not required during handover execution.
In addition, WiFi to WiMAX handover will also be able to support WiMAX handover optimization mechanism. If the prediction misses, a localized authentication executes during WiMAX to WiFi handover. So FAM provides a better real-time QoS support in WiFi-WiMAX interworking system.
Furthermore, this thesis discusses the security aspect to evaluate the proposed mechanism can not only achieve fast handoff but also ensure security. Finally, this thesis using the Network Simulation2 to experiment and analysis, after comparison with other mechanism this thesis proves that the design mechanism to obtain the best average handoff latency time.
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Wang, Ligang. "Modelling and verification of interworking between SIP and H.323." Thesis, 2002. http://spectrum.library.concordia.ca/1727/1/MQ68484.pdf.
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Various standards organizations have considered signaling for voice and video over IP from different approaches. There are currently two standards for signaling and control of Internet telephone calls, namely ITU-T Recommendation H.323 and the IETF Session Initiation Protocol (SIP). H.323 is an umbrella standard that provides a well-defined system architecture and implementation guidelines that cover the entire call set-up, call control, and the media used in the call. SIP is a text-based protocol that was designed to work hand in hand with other core Internet protocols such as HTTP. Both protocols provide comparable functionality using different mechanisms and provide similar quality of service. While SIP is more flexible and scalable, H.323 offers better network management and interoperability. Although there are numerous industry debates about the merits of the two protocols, the truth is that both of them, along with other complementary protocols, are necessary to provide universal access and to support IP-based enhanced services. Both protocols have been widely deployed, so interworking between SIP and H.323 is essential to ensure full end-to-end connectivity. Because of the inherent differences between H.323 and SIP, accommodation must be made to allow interworking between the two protocols. In this thesis, a new system model is established for simulating and verifying interworking between SIP and H.323. Five main components of this system are modelled by SDL/MSC: H.323 endpoint, H.323 gatekeeper, SIP-H.323 interworking facility, SIP server, SIP endpoint. Two configurations have been used in this model. One is that both protocols work within the same administrative domain, the other one is that both protocols are operating in separate administrative domains. Using a series of scenarios, it has been shown that the model meets the functional specifications outlined in SIP-H323-Interworking specification documents.
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Yu, Ming-Hsien, and 游明憲. "An Adaptive Mobility Management Scheme for Heterogeneous Wireless Networks Interworking." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/04183450190690223522.
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碩士<br>輔仁大學<br>資訊工程學系<br>94<br>A heterogeneous wireless network is made up by variety of property wireless networks, include wide and local area, high and low mobility, and different bandwidth support. More and more researches try to achieve seamless vertical handoff between WWAN and WLAN in accordance with all layers. It is anticipated that the future wireless mobile Internet will be a pluralistic wireless environment. Majority traditional location management schemes are based on paging mobile terminal within each domain area. These schemes generate unnecessary signaling overheads. In homogeneous wireless network, handoffs are always triggered at “handoff boundary” by detecting signaling strength. Whereas in the heterogeneous wireless network, the number of handoff triggers should be considered.
In this thesis, we proposed an adaptive mobility management scheme to decrease paging signaling and resource reservation. The adaptive principles are divided into two parts. First principle: the mobile terminal location update is based on the movement speed, and this information will pass to the system for dynamic management. The second principle: the required bandwidth of application is considered on selecting the most suitable wireless network dynamically. The application type consideration can also avoid handoff failures.
Through the experimental result, our proposed scheme is much more efficient than static scheme in most cases. In average cases, the signaling overheads are reduced up to 40%, and the paging delay are lower. Furthermore, the proposed scheme offers the better handoff trigger condition and timing to avoid handoff failures.
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Liu, Wei-Ting, and 劉威廷. "A Study of Mobility Management for 3G/UMTS-WLAN Interworking." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/69154436385719527308.
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碩士<br>朝陽科技大學<br>網路與通訊研究所<br>93<br>The mobile communication technology becomes more and more popular in the recently years. The 3G (Third generation) mobile communication system has large coverage, high speed mobility, completed subscriber management (billing system) and nearly universal roaming. On the other hand, the wireless local area network (WLAN) provides a solution for the internet access which has small coverage, low speed mobility and high data transmission rates. Some researches point out that integrates those two wireless technologies will get advantage since their characteristics are complementary under some conditions. 3GPP proposed some specifications of 3G/UMTS-WLAN interworking which give an approach for a flexible, scalable, and general way of the 3G/UMTS-WLAN interworking. However, the research of 3G/UMTS-WLAN interworking specifications still in process of more requirement such as service continuity, seamless handoff, efficient mobility management (MM) and so on. Meanwhile, the original MM method in IP (Internet Protocol) protocol will become more important since the IP-based core network is required in the next-generation (NG) heterogeneous wireless network system.
As the above reasons, this study focus on the 3G/UMTS-WLAN interworking architecture and use it as the start of the NG all-IP-based heterogeneous networks. In this study, we will review the Mobile IP protocol, present MM scheme and the other important issues such as registration procedure, security, network architecture design…etc. Furthermore, we will propose a mobility management architecture including localized fast re-authentication and handoff procedure for the 3G/UMTS-WLAN interworking. Our proposed architecture uses pre-register conception joins forces with localized fast re-authentication. Therefore, our proposed architecture improves the efficiency of 3G/UMTS-WLAN interworking mobility management and solves some problems under particular conditions.
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wu, Gen-nan, and 吳建男. "The Implementation of Enhanced Global Authentication on 3G-WLAN Interworking." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/12504020501833555223.
Full textAbstract:
碩士<br>中原大學<br>電機工程研究所<br>93<br>Abstract
In this thesis, we propose a new global authentication protocol based on integration of 3G-WLAN interworking. Integrating 3G and WLAN network may offer subscribers high-speed wireless data service and wider service area. For integrating two heterogeneous networks, this type of 3G-WLAN globoid authentication protocol is applied on the behalf of X.509 and EAP-TLS and SIP advantage. This protocol will implement an enhanced global authentication on 3G-WLAN inter-working by client getting digital certificate from one 3G-HSS.
The main idea of the 3G-WLAN globoid authentications is described as follows. First, RADIUS servers ascertain and pass client’s acknowledged data to the 3G-HSS. Then, the mutual authentication is done between client and 3G-HSS. Finally, the 3G-HSS notifies RADIUS server a acknowledge message when authentication succeed.
The contributions of this article are shown below.
(1) Combine X.509 and EAP-TLS and SIP to achieve 3G-WLAN inter-working cross-realm authentication.
(2) Make more secure environment than EAP or X.509 on WLAN.
(3) Retrench client and server memories.
(4) Fourthly, reduce time waste when certificate repeats applying and making.
Applying this type of 3G-WLAN globoid authentication method, we believe that it will help the integrating 3G and WLAN network to provide high-speed wireless data service and wide service area
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Shih, Fu-Jen, and 施富仁. "Interworking of Bluetooth Cordless Phone with Public Switched Telephone Network." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/82605304070568351629.
Full textAbstract:
碩士<br>國立中正大學<br>電機工程研究所<br>90<br>As the technology keeps evolving, the advent of wireless communication has extended from traditional LAN to PAN (Personal Area Network). The Bluetooth technology was developed following this trend. Bluetooth has the key characteristics such as low power consumption, low cost, and short-range radio transmission. Bluetooth is also the first technology that combines communication, information, and consumer products together. Since the support for audio applications is one of the key characteristics of the Bluetooth technology, we develop the Bluetooth phone gateway system based on the Cordless Telephony Profile in the Bluetooth specification.
In the thesis, we describe the software and hardware prototype of the Bluetooth phone gateway. The software includes SDP, TCS Binary and Application that confirm to the Cordless Telephony Profile. The hardware includes telephone button emulator, On hook/Off hook emulator, voice transmission circuit and ring detection circuit. We have successfully tested and verified the Bluetooth cordless phone function. The system can be used in the office/home to replace the traditional turn-key system.
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Yang, Ya-Wen, and 楊雅雯. "The Study on Authentication Protocol for WLAN and 3G/UMTS Interworking." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/y382s4.
Full textAbstract:
碩士<br>朝陽科技大學<br>網路與通訊研究所<br>93<br>The third-generation (3G) mobile communication systems provide great coverage, completed subscriber management and nearly universal roaming. Nevertheless, 3G systems are subject to the low data rates (2Mbps highest for WCDMA). WLAN (Wireless Local Area Network) provides hot spot coverage with high data rates (reaches 54Mbps while 802.11 a/g), but is subject to short range (reaches 100m the furthest) and lacking a roaming and mobility support. From users’ point of view, the Integration of WLAN and 3G systems will provide a convenient and attractive way for user to access network. The users are able to access 3G mobile network while high speed traveling or access WLAN while moving slowly or entering a specific area. However, while integrating WLAN and 3G, there are still some problems should be concerned in terms of authentication and security, such as authentication efficiency, user identity privacy (anonymity) and repudiation problem.
In this thesis, we focus on the UMTS (Universal Mobile Telecommunications System). First, we review the authentication scheme for 3G/UMTS and WLAN and 3G/UMTS interworking which are specified by 3GPP (3rd Generation Partnership Project); moreover, we propose a robust localized authentication protocol with non-repudiation service for integrating WLAN and 3G/UMTS network. The localized re-authentication protocol can shorten the authentication time delay. On the other hand, with the non-repudiation service, the assumption that subscriber has to fully trust 3G home operator can be deleted, and the trust management among the independent WLAN operator, 3G visited operator, and 3G home operator can be eliminated. In other words, our proposed protocol provides legal evidences to prevent the 3G home operator from overcharging the subscribers, and also prevent the WLAN operator and 3G visited operator from overcharging the 3G home operator; furthermore, we also solve some user identity privacy problems in 3GPP authentication mechanism.
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Chen, Wen-Hao, and 陳文豪. "Performance Investigation of Interworking Gateway in an All-IP Service Environment." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/88300224414272181667.
Full textAbstract:
碩士<br>國立東華大學<br>資訊工程學系<br>92<br>Improvements of interoperability interface IP and dual mobility function must be explored to move toward full IP and seamless multimedia applications. An All-IPv6 service architecture that comprises cellular systems and Wireless LAN networks was constructed. A GPRS/WLAN interworking gateway with an IPv6 facility was designed and its performance was investigated, in terms of queue length, system throughput, loss rate and delay. The results of the simulation of a 1Mbps WLAN & 144kbps GPRS interworking system imply that (1) the queue length is directly proportional to the traffic load. The length increases to 100 packets at 61 seconds and rate of the increase is around 50% per 30 seconds. (2) If the size of the queue is increased to 100 packets, then the loss rate declines to 0.017. A longer queue corresponds to a lower loss rate. (3) The size of the queue does not influence the system throughput. (4) The average delay is approximately 0.83second/bit, when the queue size is 100 packets. The delay doubles as the queue size doubles.
Keywords: All IPv6, Wireless LAN, GPRS System, Interworking Gateway
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Tseng, Ching-Chi, and 曾清奇. "Interworking of Powerline Home Automation Network with Public Switched Telephone Network." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/52621341430822515536.
Full textAbstract:
碩士<br>國立中正大學<br>電機工程研究所<br>91<br>In general houses nowadays, there are some power and telephone infrastructures already installed. In order to minimize cost, we can have power-lines and phone-lines as the transmission medium in the Home Automation Network. In this thesis, we will integrate mainly the power-line media with telephones and PCs to construct a whole control system.
First, this thesis is to apply the low-cost 8-bit micro-controller to design and implement the power-line distributed system architecture. Then, we complete the telephone adapter circuit design and link the design up with the power-line control system. User can monitor and control home appliances via voice response by telephone, no matter where they are. To be used more conveniently, the system has several user interfaces including keyboard on the telephone adapter and telephone or PC remote control. The communication between transmitters and receivers is to send and to receive signals over the power-line wiring. By this method, we can implement the ideal of home automation.
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Cheng, Yu-Wei, and 鄭育維. "Interworking Design and Analysis of VPLS Interconnecting TRILL Data Center Networks." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/74647995961594784008.
Full textAbstract:
碩士<br>國立中正大學<br>通訊工程研究所<br>103<br>The IETF has proposed the TRILL (Transparent Interconnection of Lots of Links) protocol, which is suitable for building a large-scale layer 2 network. It can effectively improve issues in data center networks, such as the growing numbers of virtual servers, mobility of virtual machines, and insufficient numbers of VLAN.
In order to provide customers VPN service or more resouces, this thesis proposes a method that allows VPLS core network to interconnect TRILL data centers. PE (Provider Edge) devices exchange nickname informations with each other by using LDP (Label Distribution Protocol). It can decrease the amount of control plane packets traversing the core network.
There are many advantages in our method. PEs don’t need to learn customers’ MAC addresses. All RBridges are eligible to be a tree root while calculating distribution trees. When data packets pass through core network, PEs don’t need to modify fields in the TRILL header. Our method supports multi-homing and provides load balancing between customers. In the last chapter, we analyze and compare our method with two drafts in IETF.
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YANG, QING-YU, and 楊慶裕. "Formal specification and validation of interworking between ISDN and SS#7." Thesis, 1990. http://ndltd.ncl.edu.tw/handle/19944406871161224921.
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Wang, Shih-Wen, and 王世文. "A Mobile IPv6 based Fast Handoff Scheme for 3G-WLAN Interworking." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/81880136383756765030.
Full textAbstract:
碩士<br>朝陽科技大學<br>資訊管理系碩士班<br>95<br>Abstract
In the sixth release, 3GPP presents the 3G-WLAN interworking approach which specifies the possibility and the scalability to integrate with WLAN. In this thesis, we propose a fast handoff scheme for the interworking architecture based on Mobile IPv6 and use buffering mechanism to reduce handoff delay and packets loss. Firstly, we review the 3GPP integration architecture, access point name mechanism and Mobile IPv6 approach. Then we introduce the fast handoff scheme for 3G-WLAN interworking architecture and the message flows in detail. Lastly, we show the analysis and numerical result of the proposed scheme.
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Kamath, N., and Bheemarjuna Reddy Tamma. "IP Flow Mobility based Offload in LTE Wi-Fi Interworking Scenario." Thesis, 2014. http://raiith.iith.ac.in/971/1/CS11M02.pdf.
Full textAbstract:
Mobile data traffic has seen an exponential growth in the past few years with the trend expected
to continue. LTE as a standalone cellular network is unable to keep pace with the increasing
traffic demands. In the meanwhile, wireless LAN has proven itself as an economical wireless access
technology. 3GPP has thus been encouraged to standardize the integration of Wi-Fi networks with
LTE. This opens up numerous opportunities to study data offloading and mobility management
protocols. One of the newer offloading technique is known as IP Flow Mobility, where individual
IP flows are migrated from one network to the other without affecting other flows belonging to the
same IP session. In this thesis work, a framework has been developed on ns-3 which supports flow
mobility between LTE and Wi-Fi. This framework is based on PMIPv6.
This flow mobility framework provides an opportunity to implement various algorithms to decide
which network is used to serve which flows while trying maintain a balance between bandwidth
utilization and user satisfaction. One such algorithm has been proposed here for a network consisting
of LTE and Wi-Fi. This algorithm calculates a quality value for each flow on the network using
parameters like flow type, SNR, velocity of the user, etc and tries to offload these flows onto either
network based on the flow’s quality value.
A simple simulation is carried out which validates the implementation of the framework, where
a TCP flow is migrated to a Wi-Fi network from the LTE network based on the SNR of the Wi-Fi
network. It also shows how the velocity of a UE affects the percentage of offload which can be
achieved and how the flow’s performance is affected by the offload.