1. Bernhard Walke, Peter Sievering 1 MESA Ad-Hoc Session, Copenhagen, Sept. 27, 2002 Research Interests in Mobile Broadband Ad-Hoc Networks Bernhard Walke, Peter Sievering Aachen University RWTH, www.comnets.rwth-aachen.de CONTACT: Prof. Dr.-Ing. Bernhard Walke Kopernikusstrasse 16, 52074 Aachen, Germany E-mail: Walke@ComNets.RWTH-Aachen.deWalke@ComNets.RWTH-Aachen.de Phone: +49 241 80 27910, Fax: +49 241 80 22242

2. Bernhard Walke, Peter Sievering 2 ComNets Research Group  38 scientific assistants (fully employed)  40 to 50 students assistants (part time jobs)  35 master theses in 2001  > 45 scientific publications per year  600 – 800 ComNets paper downloads per month  Partner in currently 7 European Research Projects: VIRTUOS, FUTURE, DRIVE/OVERDRIVE, IPonAir, STRIKE, SAILOR, WWRI Chair of Communication Networks (ComNets) Prof. Dr.-Ing. Bernhard Walke Faculty: Electrical & Information Engineering Aachen University (RWTH), Germany Chair WG 4: New Radio Technologies In: Wireless World Research Forum (WWRF)

3. Bernhard Walke, Peter Sievering 3 Areas of Interest to contribute (1) MESA goals:  Connectivity irrespective of time and place, incl. operation in areas where public telecommunication infrastructure has been partially destroyed or is overloaded  High level of mobility  “Always best connected” Proposed research contributions 1. Ad hoc multihop wireless broadband system design 2. Integration of broadband wireless networks into terrestrial cellular radio networks 3. Integration of broadband wireless networks into satellite systems

4. Bernhard Walke, Peter Sievering 4 Areas of Interest to contribute (2) 4. System Comparison/Evaluation based on Tools and Scenarios  ComNets has its own unique tools for system level performance evaluation.  The most important system level simulators are  GPRSim: GPRS/EDGE systems  URIS: UMTS radio interface protocol simulator  MOSS: Mobile satellite systems  TETRIS: TETRA radio interface protocol simulator  WARP2: IEEE 802.11a/b/e and HiperLAN/2 protocols  W-CHAMBSim: ComNets Broadband WLAN designed for MESA  GOOSE: Combined link and system level simulator for GSM/(E)GPRS, TETRA, UMTS, WLAN Envisaged effort: 4 man-years per year over project duration

5. Bernhard Walke, Peter Sievering 5 System Level Simulation Environment Protocols formally specified in SDL Y X SPEET Class Library ADTs - Random Generator - Statistical Evaluation - Simulation Parameter - other SDL2SPEETCL SPEET = SDL Performance Evaluation Environment and Tools

6. Bernhard Walke, Peter Sievering 6 Example Analysis: One Hop Scenario Ethernet  MPEG download video stream (5 Mb/s), the packet sizes are read from the trace file.  One duplex N-ISDN connection (64 kb/s)  Eight terminals exchanging Ethernet packets in a circular way, the Ethernet packet sizes are read from the trace file. Date rates are varied to model different loads.  The transmission rates of HiperLAN/2, IEEE 802.11a and W-CHAMB are 27 Mb/s, 24Mb/s and 24Mb/s, respectively  PCF is used in IEEE 802.11a to serve the MPEG and N-ISDN services. RTS/CTS threshold of DCF is 500 bytes. Ethernet N-ISDN MPEG Fixed core network AP

7. Bernhard Walke, Peter Sievering 7 One Hop Traffic Performance Results  W-CHAMB is able to guarantee QoS for N-ISDN and MPEG services without a central control.  H/2 has the best traffic performance in this one hop scenario.  IEEE 802.11a can support QoS for real time traffic with its PCF that functions only in a fully connected network.  The prioritized services N-ISDN and MPEG are served completely under the all load conditions.  The maximum throughput of W- CHAMB for the Ethernet service is a little lower than that of H/2, but significantly higher than that of IEEE 802.11a.

8. Bernhard Walke, Peter Sievering 8 Some Published Work on MESA Related Subjects m M. Lott, B. Walke: Performance Analysis of a Wireless Ad hoc Network with QoS Support, Telecommunication Systems, Vol. 16, 2001 m B. Walke, B. Xu: A New Air Interface Concept for Wireless Multimedia Communications beyond the 3rd Generation, In Proc. IEEE WPMC, Aalborg, Sept. 2001 m B. Walke, B. Xu: On the MAC Performance of Self-organizing Broadband Multihop Multimedia Wireless, In Proc. IEEE VTC, Atlantic City, Oct. 2001 m B. Walke, B. Xu: Design Issues of Self-organizing Broadband Wireless Networks, Computer Networks, Vol. 21, 2001 m B. Xu, B. Walke: W-CHAMB: A Wireless Channel Oriented Ad-hoc Multihop Broadband Network - Comparison with IEEE 802.11, In Proc. European Wireless, Munich, Oct. 1999 m M. Lott: Random Access for Wireless Ad hoc Broadband Networks, In Proc. European Wireless, Munich, Oct. 1999 m M. Lott, B. Walke: Performance of the Wireless Ad hoc Network W-CHAMB, In Proc. European Wireless, Munich, Oct. 1999 m B. Xu, B. Walke: Connection Control and Mobility Management in an Ad- hoc Wireless ATM Multihop LAN, In Proc. PIMRC'99, Osaka, Sept. 1999 m M. Lott, B. Walke: Performance analysis of a Wireless Ad hoc Network with QoS Support, In Proc. SPECTS '99, Chicago, July 1999