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SE Dienste u. Anwendungen i.d.Telekommunikation u.Informationstechnologie - Wireless Internet Access Network

Dienste u. Anwendungen i.d.Telekommunikation u.Informationstechnologie - Wireless Internet Access Network

Semester: Wintersemester 05/06
Art: SE
LV-Nr.: 0435 L 707
Zeit: wöchentlich, Mi 16-18.00
Raum: FR 0003
Bemerkung Vertiefungsveranstaltung im Hauptstudium (KI, BKS, WI)


Future telecom operators currently face another evolution, next generation networks are around the corner and operators are preparing themselves for this new wave. Multiple wireless access networks will represent the next generation Internet access networks. Today, many countries are deploying wireless access networks based on 802.11 (WiFi) and 802.16 (WiMax) technology. In contrast to wired networks, wireless access networks promise a fast deployable and cost-efficient solution, and together with current cellular systems, they promise high speed access to all kind of service.

This model poses many challenges related to the coexistence of such a variety of technologies and service deployment. There are many issues to be solved by the research community in other to enable high speed mobile access to services. The objective of this seminar is to outline and review some of these challenges presenting the cutting edge solutions and discussing with experts. In particular we will focus on the access, protocols for wireless access networks between layer 2 (MAC) and layer 4 (TCP), network integration, mobile services deployment, service-oriented architecture, and integration strategies (more detail description of the topics is included below.)

Lernziele und Vorgehensweise

After studying the influential papers on a relevant topic in depth, the student will have a well-founded knowledge on a technology that will shape the future of our society. Second, the sum of all presentations will allow the student to have a good overview of the relevant topics in future telecom operators. Third, discussing and defending his work in front of an audience will train the student to quickly react to comments and criticism. Students who successfully complete the seminar will be well prepared for further research activities (some opportunities may be offered).

During the semester, each student has three tasks to complete:

  • Write a scientific report about a the topic (list, see below) of up to 10 pages. The report is primarily based on the provided papers. However, the student is expected to rely on other sources of information and include his/her own ideas and opinions. The report must provide an overview of the topic and its challenges, state-of-the-art solutions and the contribution of this paper advocates. The report must clearly describe why the topic is significant and how it influences the research community, plus a personal judgment on how this work may be extended or improved. Moreover, a critical reflection of the paper must reveal the negative points of the paper, such as what is missing and what the weaknesses of the analysis.
  • Prepare a presentation of 30 minutes to be held in front of the class. The presentation shall cover all parts of the scientific report.
  • Read the papers assigned to another group for critical review. During the presentation of the other group, critical questions about the presentation shall be asked. The objective here is to open the focus beyond the assigned topic to a neighboring topic and review it critically.

Report and presentation can be made in English (preferred) or German (restrictions may apply though)

Themen - Topics

Interested students can sign up for the topic of their choice. For each topic, we will provide between 1 and 3 influential research papers presented at major conferences and publications. However, we encourage students to propose new topics that fall within the scope of this seminar. Moreover, most topics can be split into multiple topics if several students are interested in the same topic.

  • Future telecom operators
    Pablo Vidales; Pablo.Vidalestelekom.de

    Next generation telecom operators will own multiple independent networks, based on different wire and wireless technologies, which will collaborate to offer a ubiquitous services and connectivity provisioning system. This introductory topic will cover the most important issues related to the support and deployment of such operator model such as integration strategy, technical challenges, planning, and rules for network co-existence, and service provisioning.
  • Fairness and performance in mesh networks
    Roger Karrer; Roger.Karrertelekom.de

    The whole is more than the sum of its parts – and so is a mesh network that forwards data along a multihop wireless backhaul network more than an aggregation of hot spots. In particular, the end-to-end performance and fairness exhibit a behavior that significantly differs from the behavior in a wireline network. This topic will outline the behavior, exploit the reasons for the behavior and discuss solutions.
  • TCP over multihop high-speed networks
    Roger Karrer; Roger.Karrertelekom.de

    TCP has been shown to have a dismal performance over a multihop wireless network due to contention experienced at the MAC layer and due to the inherent assumption that loss only occurs due to congestion in the network. This topic will review these assumptions and give an overview of current proposals to fix TCP in multihop wireless networks.
  • DDoS in wireless access networks
    Roger Karrer; Roger.Karrertelekom.de

    Distributed denial of service attacks (DDoS) are increasingly threatening the Internet. While solutions are currently developed and deployed to defy these attacks in wireline networks, we are still largely unaware of the threats that are particular to wireless access networks. This topic will focus on attacks onto the wireless infrastructure and review the proposed solutions to defy these attacks.
  • Service Orientation as the key to success for the future telecom operators
    Marcin Solarski; Marcin.Solarskitelekom.de

    Service-Orientated Approaches and Web Service Technologies have proved their advantages in a smooth, easy and rapid integration of service and business processes in the IT solution for the enterprise market. The telecommunication industry is learning from the success story and bringing theses concepts into their business operations and structures. The work here presents an overview on the telecom operator related standardization efforts and studies the profits and traps of using the concepts of Service and Process Oriented Architectures for automating the operation of the telecom operators.
  • Grand challenges in Autonomic Communications
    Marcin Solarski; Marcin.Solarskitelekom.de
    Pablo Vidales; Pablo.Vidalestelekom.de

    Inspired by IBM’s vision on autonomic computing, many networking researcher have mapped these concepts onto the networking research area. This talk presents the foundations of the autonomic communication and studies selected research projects based on this vision. The state-of-the-art overview is followed with a comparative analysis of the approaches.
  • Self-healing networks
    Marcin Solarski; Marcin.Solarskitelekom.de

    One of the properties of autonomic networks is the ability to recover from unexpected failures occurring to the hardware, including network nodes or links, and to software running on the nodes. Traditional means to make the network continuously available used hardware redundancy and reactive handling the network failures. In this presentation, the state of the art on network resilience is followed by a systematic analysis of research approaches in the autonomic communication community. The approaches are classified and described in detail and studied with regard to their applicability.
  • Mobility management in B3G systems
    Pablo Vidales; Pablo.Vidalestelekom.de

    Next generation networks will be conformed by co-existent independent networks, integrated to provide a ubiquitous access platform to the Internet. To receive such a “combined” high-speed wireless access to the Internet many obstacles need to be overcome. One of these issues is mobility management in such models. This topic will cover different mobility schemes (e.g., terminal mobility in homogenous and heterogeneous environments, network mobility, etc) and will introduce the main standards and ongoing proposal for mobility management (SIP, HIP, MIP, etc). To conclude it will unveil the open issues in this area and plausible solutions been studied in the community.
  • Probabilistic Routing
    Martin Roth; Martin.Roth02telekom.de

    Deterministic routing solutions have been applied to wired networks since the first days of ARPANET. Recent research in highly dynamic networks, such as mesh networks, points to the use of probabilistic routing to reduce the ephemeral effects of the networking environment. Paths are repeatedly tested for their utility, and packets are more likely to be sent over better paths. This approach is often said to be inspired by a social insect metaphor, known as Swarm Intelligence. We will explore protocols in addition to some of the underlying mathematics.
  • Data consistency: Singing the same tune
    Sachin Agarwal; Sachin.Agarwaltelekom.de

    The convergence of heterogeneous computing platforms, mobile devices, and services makes it important to provide a unified and consistent data view to end users. This requires that data remain synchronized even as independent edits happen to distributed data on different (possibly disconnected) devices at different times. We look under the hood of network applications to understand data synchronization algorithms: the issues of balancing data consistency requirements with bandwidth constraints, scalability of data synchronization algorithms in large networks, tradeoffs of various approaches, and the future of ubiquitous networks that provide guarantees on serving synchronized and consistent data to end users.
  • Location Based Services
    Sudha Krishnamurthy; Sudha.Krishnamurthytelekom.de

    Location-based services (LBS) are an emerging technology that combine hardware devices and wireless communication networks with geographic information and software applications to provide a broad spectrum of location-related guidance for users. There is a currently a huge market for such services, which is turning out to be a promising source of revenue for telecom operators and service providers. Developing such services involves several research challenges, such as how to determine location with the required accuracy and utilize the real-time data in the appropriate spatial and temporal context. We will study some of the existing literature and explore some of the open issues involved in developing LBS.


  • Abgeschlossenes Vordiplom in Informatik oder einer verwandten Studienrichtung