Architectural and mobility management designs in internet-based infrastructure wireless mesh networks

Wireless mesh networks (WMNs) have recently emerged to be a cost-effective solution to support large-scale wireless Internet access. They have numerous ap- plications, such as broadband Internet access, building automation, and intelligent transportation systems. One research challenge for Internet-based WMNs is to design efficient mobility management techniques for mobile users to achieve seamless roam- ing. Mobility management includes handoff management and location management. The objective of this research is to design new handoff and location management techniques for Internet-based infrastructure WMNs. Handoff management enables a wireless network to maintain active connections as mobile users move into new service areas. Previous solutions on handoff manage- ment in infrastructure WMNs mainly focus on intra-gateway mobility. New handoff issues involved in inter-gateway mobility in WMNs have not been properly addressed. Hence, a new architectural design is proposed to facilitate inter-gateway handoff man- agement in infrastructure WMNs. The proposed architecture is designed to specifi- cally address the special handoff design challenges in Internet-based WMNs. It can facilitate parallel executions of handoffs from multiple layers, in conjunction with a data caching mechanism which guarantees minimum packet loss during handoffs. Based on the proposed architecture, a Quality of Service (QoS) handoff mechanism is also proposed to achieve QoS requirements for both handoff and existing traffic before and after handoffs in the inter-gateway WMN environment. Location management in wireless networks serves the purpose of tracking mobile users and locating them prior to establishing new communications. Existing location management solutions proposed for single-hop wireless networks cannot be directly applied to Internet-based WMNs. Hence, a dynamic location management framework in Internet-based WMNs is proposed that can guarantee the location management performance and also minimize the protocol overhead. In addition, a novel resilient location area design in Internet-based WMNs is also proposed. The formation of the location areas can adapt to the changes of both paging load and service load so that the tradeoff between paging overhead and mobile device power consumption can be balanced, and at the same time, the required QoS performance of existing traffic is maintained. Therefore, together with the proposed handoff management design, efficient mobility management can be realized in Internet-based infrastructure WMNs

Verteilt organisierte Mehrteilnehmer-Videokonferenzen für geschlossene Gruppen im Internet

Videokonferenzen gelten als eine populäre Anwendung in modernen Netzwerken. Trotz langjähriger Erfahrungen gehören sie nicht zu den alltäglich genutzten Diensten. Videokonferenzdienste im Internet unterstützen meist offene Konferenzgruppen. Jedoch haben die Mehrzahl der alltäglichen Beratungen einen geschlossenen Charakter. Systeme, die geschlossene Gruppen unterstützen, basieren meist auf spezieller Studiotechnik. Desktop-Systeme lassen nur ein begrenztes Leistungsangebot zu. Besonders beim Aufbau von Mehrteilnehmer-Gruppen ist es schwierig, eine gute Dienstgüte bereitzustellen. Deshalb haben Systeme für geschlossene Gruppen bisher keine breite Anwendung gefunden. Die vorliegende Arbeit untersucht zwei Anätze zur Gestaltungsprinzipien von geschlossenen Mehrteilnehmer-Videokonferenzsystemen. Der Erste untersucht den Aufbau von globalen Konferenzen über den Verbund lokaler Systeme. Der Zweite, ein Peer-to-Peer-Konzept, untersucht die Unterstützung von geschlossenen Gruppen im Internet.Video conferences are considered as attractive applications in high-speed networks. But they are not broadly used. Most existing video conference systems support open group conferences for public events. However, most everyday consultations have a closed character. Systems supporting closed groups are quite expensive and mostly based on special hardware. The performance of desktop systems is limited. In particular, there are difficulties in establishing multi party video conferences with sufficient QoS. This Ph.D. thesis investigates the design principles of closed multi party video conference systems for global public networks. Two approaches are described. The first approach investigates a global video conferencing service that interconnects local systems over long distances. The second one, a Peer-to-Peer approach, deals with the design of closed multiparty conferences in the Internet. In this context the problem of ensuring the QoS of the transport of real time traffic is discussed

Immersive interconnected virtual and augmented reality : a 5G and IoT perspective

Despite remarkable advances, current augmented and virtual reality (AR/VR) applications are a largely individual and local experience. Interconnected AR/VR, where participants can virtually interact across vast distances, remains a distant dream. The great barrier that stands between current technology and such applications is the stringent end-to-end latency requirement, which should not exceed 20 ms in order to avoid motion sickness and other discomforts. Bringing AR/VR to the next level to enable immersive interconnected AR/VR will require significant advances towards 5G ultra-reliable low-latency communication (URLLC) and a Tactile Internet of Things (IoT). In this article, we articulate the technical challenges to enable a future AR/VR end-to-end architecture, that combines 5G URLLC and Tactile IoT technology to support this next generation of interconnected AR/VR applications. Through the use of IoT sensors and actuators, AR/VR applications will be aware of the environmental and user context, supporting human-centric adaptations of the application logic, and lifelike interactions with the virtual environment. We present potential use cases and the required technological building blocks. For each of them, we delve into the current state of the art and challenges that need to be addressed before the dream of remote AR/VR interaction can become reality

Potentzia domeinuko NOMA 5G sareetarako eta haratago

Tesis inglés 268 p. -- Tesis euskera 274 p.During the last decade, the amount of data carried over wireless networks has grown exponentially. Several reasons have led to this situation, but the most influential ones are the massive deployment of devices connected to the network and the constant evolution in the services offered. In this context, 5G targets the correct implementation of every application integrated into the use cases. Nevertheless, the biggest challenge to make ITU-R defined cases (eMBB, URLLC and mMTC) a reality is the improvement in spectral efficiency. Therefore, in this thesis, a combination of two mechanisms is proposed to improve spectral efficiency: Non-Orthogonal Multiple Access (NOMA) techniques and Radio Resource Management (RRM) schemes. Specifically, NOMA transmits simultaneously several layered data flows so that the whole bandwidth is used throughout the entire time to deliver more than one service simultaneously. Then, RRM schemes provide efficient management and distribution of radio resources among network users. Although NOMA techniques and RRM schemes can be very advantageous in all use cases, this thesis focuses on making contributions in eMBB and URLLC environments and proposing solutions to communications that are expected to be relevant in 6G

Management qualitätsbasierter Gruppenkommunikation im Internet

Zugangs- und Nutzungskontrolle bei Unicast bedarf allein der Überwachung am Netzeingang. Diese Arbeit entwirft das Verfahren DSMC (Diffserv Multicast), das die für Multicast zusätzlich benötigte Kontrolle im Netzinneren ergänzt. Es erweitert die Paketweiterleitung (MFC) der Router nur gering und ohne Eingriff in das Multicastrouting, unterstützt so alle Multicastroutingprotokolle des Internets und bietet eine skalierbare Signalisierung zur Steuerung durch zentrales Dienstgütemanagement

IP Mobile Multicast over Next Generation Satellite Networks. Design and Evaluation of a Seamless Mobility Framework for IP Multicast Communications over a Multi-beam Geostationary Satellite Network

The inherent broadcast nature of satellites, their global coverage and direct access to a large number of subscribers give satellites unrivalled advantages in supporting IP multicast applications. A new generation of satellite systems that support regenerative on-board processors and multiple spot beam technology have opened new possibilities of implementing IP multicast communication over satellites. These new features enable satellites to make efficient use of their allocated bandwidth resources and provide cost effective network services but equally, create new challenges for mobile satellite terminals. IP mobility support in general and IP mobile multicast support in particular on mobile satellite terminals like the ones mounted on continental flights, maritime vessels, etc., still remain big challenges that have received very little attention from the research community. Up till now, there are no proposed mechanisms to support IP multicast for mobile receivers/sources in multi-beam satellite networks in open literature. This study explores the suitability of IP multicast mobility support schemes defined for terrestrial networks in a satellite environment and proposes novel schemes based on the concepts of Home and Remote subscription-based approaches, multiple interface and PMIPv6 protocol. Detailed analysis and comparison of results obtained from the proposed schemes, Mobile IP (MIP) Home and Remote subscription-based approaches (for terrestrial networks) when implemented on a reference multi-beam satellite network are presented. From these results, the proposed schemes outperform the MIP Home and Remote subscription-based approaches in terms of gateway handover latency, number of multicast packets lost and signalling cost over the satellite air interface