An example of the usage of wireless LAN technologyfor multimedia: see Berlin live!

TKN - Telecommunication Networks Group TU-Berlin
Head of Group: Prof. Adam Wolisz Faculty of Electrical Engineering and Computer Science


    The objective of WIGWAM is the design of a complete system for wireless communication with a maximum transmission data rate of 1 Gbit/s. The targeted spectrum is the 5 GHz band and the extension bands 17, 24, and 60 GHz. Depending on the mobility of the user, the data rate should be scalable. Besides typical application areas, i.e. "hot-spots" and home/office scenarios, WIGWAM covers the toppic of providing high data rates for high mobility application scenarios. The Telecomunicaiton Network Group (TKN) of TU Berlin is involved in the sub-project "Radio Links With Highest Data Rates on Fast Altering Radio Channels Based on WLAN Principles" in which it contributes the support for fast and seamless handover.
  2. TCP/IP over Air
    In a joint project with Siemens AG ICM, we are investigating how future air interfaces can match the requirements of different types of applications. Specifically, we are interested in the characterization of traffic loads generated by various kinds of applications as well as in the possibility that are offered by suitably adapting MAC and link-layer protocols to the variability of a wireless channel.
  3. EYES
    The European EYES project is researching the potential of so-called sensor networks. These networks consist of spontaneously organized networks of very small, simple nodes that perform sensor or actuators duties. In this context, we are specifically investigating the problem of distributed algorithms (e.g., consensus or converge-cast) in such environments, as well as the question of supporting semantic addressing ("Give me the temperature from any sensor in the living room") in the transport, network, link- and MAC-layer. Key constraints in such networks are energy supply and energy efficiency and the need to do with minimum amounts of computational resources.

    Information on the EYES project can be found on the official EYES web page.

  4. DISCOURSE (intern)
    The DISCOURSE project (Distributed, Collaborative University Research and Study Environment) is a joint project of four Berlin-area universities and Microsoft Research. The main goal is to develop concepts for distributed environments, integrating small endsystems, ad-hoc collaborations and backend infrastructure systems like file systems in an elegant, seamless fashion. Our main focus in this project is the problem of setting up ad-hoc networks and integrating such ad-hoc networks into existing middleware environments, where specific attention has to be paid to security concerns.
  5. Capacity and Energy Efficiency of Cellular Networks (HyperNET/IBMS2)
    In cellular Networks the capacity is limited by Interference of multiple mobiles at one base station. This project deals with the reduction of radiated power by using the other mobiles in the net as a relay station.
  6. Flexinet
    The development of the internet is influenced by new technologies and applications but the protocols that carry the data  are not often changed even with new media. The Flexinet Project deals with the programming of the nodes to achieve a better performance in active networks.
  7. Transinet
    This project deals with the broadband architecture of the future internet. The main topics are: network and node architecture, traffic aggregation, QoS, switching technologies, interconnection between fixed and mobile network.
  8. Wireless TCP
    The wireless access to the internet is more and more important. Unfortunately some research has shown that the common protocols TCP and UDP do not cooperate with the radio link protocol and the performance is low. There are two approaches to solve this problem: One approach tries to solve the problem by the usage of a modified radio link protocol, the other approach uses a converting node that uses a special protocol to encapsulate the IP-data on the radio link.
  9. Adaptive Data-Link to optimise Interactive Voice over Wireless, Local Networks
    Users demand for a high quality wireless Internet. However, the wireless access is the
    bottleneck in the world-wide communication systems, since wireless links often have small
    capacity and a temporally varying channel quality. Thus, optimising the transmission
    performance of wireless Internet is promising.
  10. Leveraging channel predictions for OFDM
    Short-term predictions about the channel quality of an OFDM permit to improve the efficiency of resource usage. As an example, consider a cellular system that uses OFDM in the downlink. Usually, the various OFDM sub-carriers' quality varies both over time and over mutliple users. If this quality is known in advance, various scheduling techniques can be used to, e.g., maximize the available throughput for all users. It is the goal of this project to investigate algorithms to support such prediction-based sub-carrier scheduling as well as develop architectures, mechanisms, and protocols to implement this concept in real systems.
  11. Proxy-based congestion and flow control
    In mixed wired / wireless networks, the efficient support of large-scale traffic streams is of pivotal importance. An important aspect is congestion and flow control, where the traditional end-to-end paradigm is increasingly questioned. More and more, proxy- or middlebox-based approaches are gaining popularity. In this project, we investigate the use of congestion control proxies that work by exploiting joint congestion control information of multiple traffic streams.
  12. SeQoMo
    SeQoMo (Security, QoS and Mobility) is funded by Siemens AG. The focus of this project is to investigate the suitability of IP-based networks for support of mobility under the perspective of advanced mobility mechanisms, security, and Quality of Service (QoS).
    The investigation of mobility mechanisms has resulted in the development of the MOMBASA architecture and software environment that enables the use of multicast for mobility support. The QoS support rests upon the concept of a binding update which is conditionalized upon the availability of sufficient resources in a new path during a handover. The security part has focused on authentication, authorization and denial of service protection in mobile, IP-based networks.
    Integrating these three components into an overall secure, QoS-capable mobility architecture based upon IP protocols is the ultimate goal of this project.
  13. Autarke verteilte Mikrosysteme
    The project "Autarke verteilte Mikrosysteme (AVM)" (self-sufficient distributed microsystems) is a collaborative project funded by the German government (BMBF) and deals with the design of small sensor and actuator devices and their networking into a distributed system. The interest of our group is on energy-efficient MAC, routing, and transport mechanisms, taking into account the specific design goals (e.g., simple smart antennas) of the hardware components to be developed in this project.
  14. The Miniwatt project
    The Miniwatt project is a joint effort of several German universities and companies, funded by the German government. Its goal is to investigate and develop mechanisms to reduce the electro-magnetic exposure that is caused by wireless mobile communication. The activities at the TKN TUB group are focused on exploiting (ad hoc) multi-hop communication principles to reduce transmission power as a means to reduce electro-magnetic exposure immitted power and / or energy. The constraint is that multi-hop communication should not reduce the end-to-end capacity of a network.


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