Dr. Sc. Jose Miguel Costa Requena

To my personal Web page

My history

I graduated as M.Sc.(Eng.) from the Polytechnic University of Valencia (UPV) -SPAIN- on March 1999

I have been working:


Construction Department of UPV

Research Assistant


Telecommunication Projects Department

System Planning Researcher 


Laboratory of Telecommunications Department


My interest areas

Background of the IPANA project

The wide and ever-growing usage of Internet and the birth of new Internet applications ( e.g. telephony and video conference ) requires a smooth transition to network components providing both the old and new services. This has caused development of new label swapping  protocols for Internet routing, to make it possible to use  broadband technologies like the ATM in the transmission level.

Several solutions to do this task have been suggested by different parties e.g. Classical IP over ATM, ATM Forum LAN Emulation and ATM Forum Multiprotocol Over ATM (MPOA).

IPSILON Inc. introduced in the spring of 1996 the concept of IP switching, where the functionality of internet routers and ATM switches was combined.

After Ipsilon Inc. have several other parties proposed  their own versions including CISCO's Tag Switching, IBM's Aggregate Route-Based IP Switching (ARIS), Juha Heinänen's Switching IP Through ATM (SITA), Toshiba's Cell Switch Router (CSR) and the MPLS-workgroup's Multiprotocol Label Swapping (MPLS).  As the latest one is there now coming Augmented IP Protocol (AIRP). All of those technologies are usually called the IP swapping, and their basic technical ideas are also compared.

The basic idea behind the IP switching is to reduce the workload of the router by switching long-lived data flows, containing relatively large amounts of data, to separate ATM-connections. This concept is rather simple, but  contains also several challenging issues to be solved, e.g. Quality of Service, CAC and resource allocation.  Especially in my topic, implementation and optimization  of a large IP switched network opens a huge problem area.

Research done in theIPANA project

A lot of preliminary studies, theses and articles have been made in the IPANA project before I come to it, and I may refer to the respective pages and articles of my colleagues.

We also have in our lab a non-working research network, which is implemented by using  IPSILON technology. There are also multimedia traffic sources and the measurement equipment's available in the research network.

I have been working unto now with my Master Thesis  "An Implementation of the Server Cache Synchronisation Protocol (SCSP)"


My Master Thesis is titled "An Implementation of the Server Cache Synchronisation Protocol (SCSP) "

Initially, the SCSP algorithm establishes the data synchronisation among a set of server entities of a particular protocol which are bound to a Server Group (SG). After that it maintains an actively mirroring state of any change in every cache information that form the SG.

The program implemented is based on an object-oriented software environment. This leads to a modular implementation. Different processes take place between each "Local Server" (LS) and its "Direct Connected Server" (DCS). The protocol code (which is written in C++) facilitates an easy translation to new communication architectures and services in a rapidly changing scenario. In that way the platform-dependence was minimised using the software functions provided by Free Software Foundation, GNU". UNIX, is the operating system chosen for the software development. UNIX provides enough speed to the protocol performance in those situations where the data replication is important for the system which is using the SCSP.

The basic structures used by the program were developed following the Management Information Base (MIB) specifications. The purpose is to permit later interactions with an SNMP agent, which checks the correct functioning of the protocol.

The most important application of this software package is focused in the IP Telephony and the new emerging directory services. For those services it is necessary to manage large amounts of information that is stored in distributed databases that need to be efficiently updated and replicated.



·  Implementation of the Internet Call Waiting Service using SIP Raimo Kantola, Jose Costa and Inmaculada Espigares. Pdf

·  A Scalability Analysis of the Server Cache Synchronization Protocol (SCSP) Raimo Katola, Jose Costa and Julio Yebebnes. Pdf

·  Security and auto-congiguration of Location Servers for IP Telephony Raimo Kantola, Jose Costa and Ignacio Gonzalez Olias. Pdf

·  Scalability Analysis of ENUM for IP Telephony Routing Raimo Kantola, Jose Costa and Xiaoling Zhen.


Abstracts of following papers are stored with other papers from this project.

Full papers are either in PostScript or PDF form.



·  R Kantola and J M Costa Requena: "The Server Cache Synchronization Protocol - a component for Directory Enabled Networks", accepted to SPIE VVD'99 Presentation slides

I. Espigares, R Kantola and J M Costa Requena: "New tools for Programming IP Telephony services", The first IP Telephony Workshop, Berlin, April 2000. Conference

R Kantola, J M Costa Requena and Nicklas Beijar:"An Architecture for an SCN/IP Telephony routing testbed", presented at The first IP Telephony Workshop, Berlin, April 2000. Conference

R Kantola, J M Costa Requena and Nicklas Beijar:"A Common Numbering Infrastructure for IN and IP Telephony", presented at IN2000, Cape Town, South Africa, May 2000. Conference

R Kantola, J M Costa Requena and Nicklas Beijar:"SIP 200 beyond H.323" Paris, 08.05.200- 12.05.200. Paper

H Tang and J Costa Requena: "Serving Spatial Location over Internet". Proceedings of the ACM 2nd International Conference on Mobile Data Management, Springer, pp.246-251, Jan. 2001.

J Costa Requena and I Espigares: "Security concerns in 3G networks", The Internet and Multimedia Systems and Applications (IMSA2001). proceedings of the IASTED International Conference, pp 91-95, August 2001. Conference

J Costa Requena and I Espigares: "Identifying security gaps in 3G", Paris IPSEC, October 2001. Conference

J Costa Requena and H Tang:"Enable SIP with Spatial Location for Emergency Call Services",IEEE ICCCN2001, October 2001. Conference


R Kantola, Jose Costa Requena, Nicklas Beijar: "Interoperable routing for IN and IP Telephony", Computer Networks Journal.

J Costa Requena and H Tang:"Application of Spatial Location Information to SIP", The Journal of Networks, Software and Applications. Issue

IETF Drafts

"Spatial Location Protocol Requirements", Draft(expired)

"Basic SloP Architecture Proposal" , Draft(expired)

"Target Naming Scheme", Draft(expired)

"Mapping of Basic and Digest Authentication to DIAMETER AAA Messages", Draft



Actual Research in our Laboratory is focused in the Interoperability between GSTN and IP

·  Gateway Location Protocol or Telephony Routing over IP implementation using Python and MySQL. Raimo Kantola,Jose Costa and Juho Haapala. Presentation slides

·  Implementation of new services using SIP and XML. Raimo Kantola, Jose Costa and Inmaculada Espigares.

·  Interoperability between GSTN and IP. Implementation of the Number Portability Routing Protocol. Raimo Katola, Jose Costa and Nicklas Beijar.

In the case you would like to get more information about my study,  or you have any comments or questions to it, please
send me  a message.  I would be very grateful.

Tämän sivun sisällöstä vastaavat webmaster@keskus.hut.fi, Jose M Costa  

Sivua on viimeksi päivitetty 01.10.1998 13:30
URL: http://keskus.hut.fi/tutkimus/ipana/pers/jose.shtml
[TKK | Teletekniikka


=>Anna palautetta!