Javier Gomez-Castellanos

Dept. of Electrical Engineering, Columbia University, 
500 W. 120th Str., Mail Code 4712, Box  #G-1
New York, NY, 10027-6699 
Fax: (212) 932-9421 , Tel: (212) 854-0609
E-mail: javierg@comet.columbia.edu , Web: http://comet.columbia.edu/~javierg

Areas of Interest

 Projects that demand a combination of analytic skills and systems experience including wireless/mobile ad hoc networking, network performance and provisioning.

Education

 Ph.D. Candidate, Dept. of Electrical Engineering, Columbia University, 1996-present. (Graduation expected 2002).

M.S. Dept. of Electrical Engineering, Columbia University, 1994-1996. 

B.A.Sc., School of Engineering  (Electrical Engineering), National Autonomous University of Mexico (UNAM), Mexico, 1988-1994.

Industrial 
Experience 

 - Position: Summer Intern, Pervasive Security and Networking Group
IBM T. J. Watson Research Center, Hawthorne, NY,     March 01 - August 01
Mentor: Dr. Mahmoud Naghshineh and Dr. C. Bisdikian
Activities:
         - Research on on-demand wireless internet provisioning. 

- Position: Summer Intern,  Pervasive Security and Networking Group
IBM T. J. Watson Research Center, Hawthorne, NY,     May 00 - Sept. 00
Mentor: Dr. M. Naghshineh and Dr. C. Bisdikian
Activities:
         - Research on power-aware design in wireless and ad hoc networks and bluetooth-based networking. 

- Position: Summer Intern, Pervasive Security and Networking Group
IBM T. J. Watson Research Center, Hawthorne, NY,     May 99 - Sept. 99
Mentor: Dr. M. Naghshineh
Activities:
         - Research on power-aware design in wireless cellular and ad hoc networks. Bluetooth network support and applications. 

Ph.D. Research
Summary 

 A systems approach to quality of service (QoS) in wireless IP cellular and wireless ad hoc networks. My thesis Our addresses a number of mechanisms that operate over different time scales to provide enhanced quality of service to mobile users. I have:  i) studied power aware design in ad hoc networks, developed a power-aware routing protocol suitable for operation in single hop topologies, (e.g., sensor networks, WLANs, etc.) as well as plug-in power-saving modules for multihop networks (e.g., MANET); and ii) investigated transmission power control tradeoffs on physical connectivity, network capacity,  network connectivity, and  QoS in wireless ad hoc networks. A combination of simulation, analysis and the development of a novel experimental  wireless testbed provides an evaluation of the proposed algorithms. 

Research Experience 

 Graduate Research Assistant, COMET Group, Dept. of Electrical Engineering, Columbia University, 1996-present.
Doctoral thesis research in the area of QoS provisioning in wireless and ad hoc networks, power-aware routing design in ad hoc networks, network performance and network scaling in ad hoc networks under the supervision of Professor Andrew T. Campbell. 

Research Activities 

 Presentations and system demonstration at international conferences and workshops; 
Reviewer for IEEE JSAC, INFOCOM, MOBICOM, ACM MONET, WINET, etc.

Teaching Experience 

 Graduate Research Assistant, COMET Group, Columbia University, 1996 - present.

Supervised independent research projects for Master level students; managed project development of Cellular IP v1.0 test-bed. 

Teaching Assistant for the graduate class EE E6901: Topics in Electrical and Computer Engineering , Dept. of Electrical Engineering, Columbia University, 1998 (with Professor Dr. Mahmoud Naghshineh). 

Teaching Assistant for the graduate class EE E6968: Topics in Telecommunication Networks, Dept. of Electrical Engineering, Columbia University, 1999 (with Professor Dr. Thomas LaPorta).

Software Release 

 [S1] Cellular IP: Linux and FreeBSD source code distribution for Cellular IP version 1.0, November 1999. http://www.comet.columbia.edu/cellularip,  1600 downloads to date.

[S2] CIMS: The Columbia IP Micro-mobility software.  NS-2 Source Code Distribution for Cellular IP, Hawaii and Hierarchical Mobile IP, April 2001. http://www.comet.columbia.edu/micrimobilty,  700 downloads to date

[S3] MOBIWARE: a CORBA-based programmable mobile network, 1996-1998; http://www.comet.columbia.edu/mobiware, 1100 downloads to date

[S4] PMIP: ns-2 Paging extensions of Mobile IP. http://www.comet.columbia.edu/pmip 

Journals Publications 

 [J1] J. Gomez-Castellanos, A. T. Campbell, M. Naghshineh, C. Bisdikian "PARO: Supporting Transmission Power Control for Routing in Wireless Ad Hoc Networks,"  ACM/Baltzer Journal on Mobile Networks (MONET) 2002. 

[J2] A. T. Campbell, Gomez, J., Kim, S., Turanyi, Z., Wan, C-Y. and A, Valko "Experiences with Cellular IP", Journal of High Speed Networks (JHSN), Special issue on multimedia in wired and wireless environment, invited paper,  2002.

[J3] A. T. Campbell, Gomez, J., Kim, S., Turanyi, Z., Wan, C-Y. and A, Valko "A Comparison of IP Micro-Mobility Protocols", IEEE Wireless Communications Magazine, Vol. 9, No. 1, February 2002.

[J4] X. Zhang, J.  Gomez-Castellanos, and A. T. Campbell, "Design and Performance of Mobile IP Paging,"  ACM Mobile Networks and Applications (MONET), Special issue on Modeling Analysis and Simulation of Wireless and Mobile Systems, Vol. 7, No. 2, March 2002.

[J5] Andrew T. Campbell, Javier Gomez-Castellanos, "IP Micro Mobility Protocols", ACM SIGMOBILE Mobile Computing and Communications Review, October 2000, Vol. 4, No. 4, pp 45-54.

[J6] Javier Gomez-Castellanos, Andrew T. Campbell, "Supporting Application and Channel Dependent Quality of Service in Wireless Networks", ACM/Baltzer Journal on Wireless Networks (WINET), 2002

[J7] Andrew T. Campbell, Javier Gomez, SanghyoKim, Zoltan Turanyi, Chieh-Yih Wan, and Andras G. Valko, "Design, Implementation, and Evaluation of Cellular IP", IEEE Personal Communications, Special Issue on IP-based Mobile Telecommunications Networks, pp. 42-49, August 2000. 

Journals under Submission 

 [J8]  J. Gomez-Castellanos, A. T. Campbell, "Transmission Power Scaling in Wireless Ad hoc Networks,", under submission. 

Conference Publications 

 [C1] Javier Gomez, Andrew T. Campbell, Mahmoud Naghshineh and Chatschik Bisdikian, "PARO: Power-Aware Routing Optimization for Wireless ad hoc Networks",  IEEE 9th International Conference on Network Protocols (ICNP'01), Riverside, California. November 2001.

[C2] X. Zhang, J. Gomez-Castellanos, and A. Campbell, "P-MIP: Paging in Mobile IP,", ACM Fourth International Workshop on Wireless Mobile Multimedia (WOWMOM'01), Rome, Italy, July 2001. 

[C3] Javier Gomez, Andrew T. Campbell, "Power-Aware Routing Optimization for Wireless ad hoc Networks", High Speed Networks Workshop (HSN'2001), Balatonfured, Hungary, June 2001. 

[C4] Javier Gomez, Andrew T. Campbell, "A Channel Predictor for Wireless Packet Networks", IEEE International Conference on Multimedia and Expo (ICME 2000), New York, NY July-August 2000. 

[C5] Javier Gomez, Andrew T. Campbell, "Building a Cellular IP Testbed", IP Based Cellular Network Conference (IPCN 2000), Paris, France, May 2000. 

[C6] Javier Gomez, Andrew T. Campbell, Mahmoud Naghshineh, Chatschik Bisdikian "Power-aware Routing in Wireless Packet Networks", Sixth IEEE International Workshop on Mobile Multimedia Communications (MoMuC'99), San Diego, California, November 1999. 

[C7] S. Kim, C-Y. Wan, W. B. Paul, T. Sawada, A. T. Campbell, J. Gomez, A. G. Valko, "A Cellular IP Demonstrator", Sixth IEEE International Workshop on Mobile Multimedia Communications (MoMuC'99), San Diego, California, November 1999. 

[C8] J. Gomez, A. T. Campbell and H. Morikawa, "The Havana Framework for Supporting Application and Channel Dependent QOS in Wireless Networks" , IEEE 7th International Conference on Network Protocols (ICNP'99), November 1999, Toronto, Canada. 

[C9] Andrew T. Campbell, Javier Gomez, Andras G. Valko, "An Overview of Cellular IP", IEEE Wireless Communications and Networking Conference (WCNC'99), New Orleans, September 1999.

[C10] A. G. Valko, J. Gomez, S. Kim, A. T. Campbell, "On the Analysis of Cellular IP Access Networks", IFIP Sixth International Workshop on Protocols for High Speed Networks (PfHSN'99), Salem Massachusetts, August 1999.

[C11] J. Gomez, A. T. Campbell, "Integrated QOS for Wireless Packet Networks", Mobile Multimedia Communication - Systems and Networks, Dagstuhl, Germany, May 1999. 

[C12] J. Gomez, A. T. Campbell, "Supporting Adaptive-QOS over Multiple Time Scales in Wireless Networks", DIMACS Workshop on Mobile Networks and Computing, Piscataway, NJ, March 1999. 

[C13] J. Gomez, A. T. Campbell and H. Morikawa, "A Systems Approach to Prediction, Compensation and Adaptation in Wireless Networks",  ACM First International Workshop on Wireless Mobile Multimedia (WOWMOM '98), Dallas, Texas, October 1998. 

[C14] A. G. Valko, A. T. Campbell, J. Gomez, "Cellular IP - A Local Mobility Protocol," IEEE 13th Annual Computer Communications Workshop, Oxford, Mississippi, , October 1998. 

[C15] J. Gomez, M. Naghshineh, "Link error impact on MPEG video over Wireless Broadband Networks", Proc. of IFIP Fifth International Workshop on Quality of Service (IWQOS'97), New York, USA. May 21-23 1997. 

Internet Drafts

 [D1] J. Gomez-Castellanos, A. Campbell, M. Naghshineh, C. Bisdikian, "PARO: A Power-Aware Routing Optimization Scheme for Mobile Ad hoc Networks," draft-gomez-paro-manet-00.txt , Internet Draft, IETF, March 2001.

[D2] X. Zhang, J. Gomez-Castellanos, A. Campbell,K. Sawada, and M. Barry, "P-MIP: Minimal Paging Extensions for Mobile IP,"draft-zhang-pmip-00.txt , Internet Draft, IETF, July 2000.

[D3] A. T. Campbell, S. Kim, J. Gomez, C-Y. Wan, Z. Turanyi, A. Valko, "draft-ietf-mobileip-cellularip-00.tx", IETF mobile IP Working Group Document, December 1999. 

[D4] A. T. Cambell, S. Kim, J. Gomez, C-Y. Wan, Z. Turanyi, A. Valko, "Cellular IP Performance", draft-gomez-cellularip-perf-00.txt, October 1999. Slides of the presentation at 46rd IETF, Mobile IP Working Group, Washington, DC, November 1999

[D5] A. Campbell, J. Gomez, C-Y. Wan, Z. Turanyi, A. Valko, "Cellular IP," Internet Draft, draft-valko-cellularip-01.txt, October 1999.

[D6] A. G. Valko, A. T. Campbell, J. Gomez, "Cellular IP", Internet Draft, draft-valko-cellularip-00.txt, November 1998.  presentation at 43rd IETF, Mobile IP Working Group, Orlando, December 1998.
Research Contributions IP Micromobility Protocols
Played a leading role  in the development of IP micromobility protocols. Contributed to a number of major projects at Columbia University: 

Cellular IP:
Played a key role in the development of Cellular IP [J2] [J7]. Cellular IP supports fast handoff and IP paging capabilities.  Designed, implemented and evaluated the first Cellular IP implementation at Columbia. Key designer for base station code. Released software code [S1] and presented Internet Draft at the 46th IETF  Mobile IP Working Group [D4].

CIMS:
Developed NS-2 implementation of Cellular IP. Lead team  that developed the Columbia IP micro-mobility  software release (CIMS).  CIMS included models and source code for various micro-mobility protocols including Hawaii, Cellular IP, and  Hierarchical Mobile IP. Presented an evaluation of the CIMS system in a recent paper [J3].

IP Paging:
Mobile IP supports registration but not paging. Mobile IP support for paging is important to improve the salability of Mobile IP networks. Co-designed with X. Zhang the first mobile IP extended IP paging system implementation. Evaluated the system in [J4] and released software to the public [S3]. 

Wireless Ad Hoc and Sensor Networks 
Played a leading role  in the development of a number of projects in the area of wireless ad hoc and sensor networks.

PARO:
Lead  researcher in the PARO project at Columbia University [J1].  PARO is a power-aware routing optimization protocol that helps to minimize the transmission power needed to forward packets between wireless devices in ad hoc networks. Using PARO, one or more intermediate nodes called ``redirectors'' elect to forward packets on behalf of source-destination pairs, thus, reducing the aggregate transmission power consumed by wireless devices.  PARO is applicable to a number of networking environments including sensor  networks, home networks and mobile ad hoc networks. PARO can also interoperate with standard MANET protocols as a power-optimization plug-in. Presented the PARO Internet Draft at the 50th IETF meeting of the mobile ad hoc networks (MANET ) Working Group [D1].

HAVANA:
Lead architect behind the HAVANA project at Columbia University. This project studied  mechanisms to support integrated adaptive-QOS that responds to wireless channel impairments over multiple time scales at the flow/session level. At the packet transmission time scale, a channel predictor determines whether to transmit a packet or not depending on the state of the wireless channel [J6]. At the packet scheduling time scale, a compensator credits and compensates flows that experience bad link quality. Over even longer time scales an adaptor regulates flows taking into account the ability of wireless applications to adapt to changes in available bandwidth and channel conditions.

Scalability in Ad Hoc Networks:
Currently studying the main transmission power control tradeoffs on physical connectivity, network capacity,  network connectivity, and  QoS for ad hoc networks using mathematical tools [J8]. 

Programmable Mobile Networks

Mobiware: 
Contributed to the Mobiware project at Columbia University. Developed the Window's link  layer API to provide signal and QoS measurements. This API can trigger link handoff and QoS  handoff using Corba-based software in mobiware. Mobiware is based on a methodology of open programmability for the introduction, control and management of new adaptive mobile services in mobile networks [S2]. 
Software and Systems Background Extensive experience with the UNIX, Windows, MS-DOS operating systems using the following computer languages: C, C++, JAVA, PASCAL, and HTML. Hands on experience with B-ISDN, ATM, TCP/IP, CGI, Servlets and socket programming, knowledge of the ns simulator.
Languages Fluent English and Spanish

References 

 Dr. Andrew T. Campbell
(Doctoral Research Adviser) 
campbell@comet.columbia.edu, +1 212 854-3109
Associate Professor, Dept. of Electrical Engineering, Columbia University, 
1312 Mudd Building, 530 W. 120th Street, New York, NY 10027

Dr. Mahmoud Naghshineh
mahmoud@us.ibm.com,  + 1 914 784-6231
IBM T. J. Watson Research Center
3S-B58
19 Skyline Drive
Hawthorne, NY 10532, USA3-D46

Dr. Chatschik Bisdikiian
bisdikian@us.ibm.com,+ 1 914 784-7439
IBM T. J. Watson Research Center
3S-B34
19 Skyline Drive
Hawthorne, NY 10532, USA

Dr. Mischa Schwartz
schwartz@ee.columbia.edu, +1 212 854-3125
Professor Emeritus, Dept. of Electrical Engineering, Columbia University, 
1312 Mudd Building, 530 W. 120th Street, New York, NY10027