Technical University of Braunschweig · Computer Science at TU BS · Operating Systems and Computer Networks


Communication and Mobility by Cellular Advanced Radio
Part of the BMBF sponsored system concept UMTSplus
COMCAR Basic Scenario The COMCAR project targets at the conception and prototypical realisation of an innovative mobile communication network, which shall satisfy the increasing demand for IP-based multimedia and telematics services especially in cars and railways. The COMCAR project is a part of UMTSplus, a new system concept sponsored by the German Ministry for Education and Research (BMB+F), which aims at "Universality and Mobility in Telecommunication Networks and Systems".

The main focus in COMCAR is on asymmetrical and interactive mobile IP-based services. Existing and upcoming elaborated radio technologies and infrastructure as GSM, UMTS, DVB-T and DAB shall be considered for integration and further optimization mainly of the downlink but also of the uplink. COMCAR investigates both the integration of an additional downlink into UMTS and the co-operation of mobile with digital broadcast (DxB) systems to enable high-quality asymmetric IP communication. Solutions for high data rate communication shall be achieved, which maintain high mobility require-ments. Since terrestrial TV goes digital there exists a certain degree of probability to allot some spec-trum in the range of 470 - 862 MHz, which is especially suited for wide-area coverage mobile commu-nication services. However, it can not be expected that this additional spectrum will be harmonised in Europe, hence methods shall be developed which allow a dynamic assignment of frequency ranges to communication services and their fair coexistence.

Here at our institute, we focus on providing IP services in mobile communication networks, namely integrating the Differentiated Services approach into 3rd generation mobile networks such as the Universal Mobile Telecommunication System (UMTS). Since the usage of adaptive applications in wireless mobile environments has a substantial benefit due to the varying resource conditions, we will analyze the effects of adaptive applications in conjunction with service differentiation.

  • J. Diederich, T. Lohmar, M. Zitterbart, R. Keller. A QoS Model for Differentiated Services in Mobile Wireless Networks, Paper Digest of the 11th IEEE Workshop on Local and Metropolitan Area Networks (LANMAN), Boulder, Colorado, U.S.A., March, 2001
  • J. Diederich, T. Lohmar, M. Zitterbart, R. Keller. On Integrating Differentiated Services and UMTS Networks, Proceedings of 25th Conference on Local Computer Networks (LCN 2000), Tampa, Florida, U.S.A., November, 2000
  • J. Diederich, T. Lohmar, M. Zitterbart, R. Keller. Traffic Phase Effects with RED and Constant Bit Rate UDP-Based Traffic, Proceedings of First COST 263 International Workshop (QofIS 2000), Berlin, Germany, September, 2000
  • J. Diederich, M. Zitterbart. An expedited forwarding with dropping PHB, Internet Draft, Work in progress, October, 1999
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