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Using Fair DHTs for Location Aware Service Discovery

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The objective of this talk it is to introduce the work at UC3M NETCOM research group in location aware service discovery based on fair DHT . We have designed a system for location aware service discovery based on DHTs systems. In conjunction with UPC (Technical University of Catalonia) we created and extended our previous systems an adapted it to Mobility Scenarios and Home Agents Discovery (fP2P-HN). The lack of route optimization in Mobile IP and NEMO considerably reduces the communications performance, increased the delay and the infrastructure load. The solution at fP2P-HN allows the deploying of several Home Agents (HAs) through the Internet. A Mobile Node (MN) or a Mobile Network (NEMO) can select a closer HA to its topological position in order to reduce the delay of the paths towards its peers. fP2P-HN uses a p2p network to signal the location of the different HAs. The main advantages of the fP2P-HN over the existing ones are the scalability, the reduction of the communication delay and the load of the HAs. We have evaluated the performance of the fP2P-HN by simulation. Our results show that the fP2P-HN is scalable since the amount of signaling messages per HA does not increase, even if the number of deployed HAs increases. We also show that the average reduction of the communication’s delay compared to Mobile IP/NEMO is 23% (with a minimum deployment) and the reduction of the load at the HA is at least 54%.

Bio: Carmen Guerrero received the Telecommunication Engineering degree in 1994 from the Technical University of Madrid (UPM), Spain, and the Ph.D. in Computer Science in 1998 from the Universidade da Coruña (UDC), Spain. She is currently associate professor since 2003 at Universidad Carlos III de Madrid (UC3M), teaching computer networks courses. She has been involved in several national and international research projects related with content distribution, overlay networks, information retrieval, broadband access networks, network management and advanced network and multimedia real time systems. More details of her profile are available at: This research is supported by: CONTENT EU NoE (, BIOGRIDNET Project (, IMDEA Networks Research Institute ( and NETCOM Research Group at University Carlos III Madrid (

This talk is part of the Computer Laboratory Systems Research Group Seminar series.

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