I am a Research Staff Member in the Internet Infrastructure and Computing Utilities department, IBM TJ Watson Research Center, Hawthorne.

Contact : arup@us.ibm.com

Phone : +1 914 784 7481 / sip:arup@research.ibm.com

I have been working in the area of SIP / IMS / Converged Communications [link] since 2002 and initiated much of SIP research at Watson through corporate technology team studies and early research projects. I am one of the focal points for SIP technology within the company and have active ongoing collaborations with the Integrated Communications service product line in Global Technology Services (GTS), Software group (Datapower, Presence Server), Server group (BladeCenter/ Telco servers) and ISS (Internet Security Systems).

Some of they key research projects that I have led include :

1. Large-scale Federated Presence - Scalability, Aggregation and Application-enablement : A first-of-a-kind Research project to start end of 2007 jointly with IBM India Research. [link]
2. Reference architecture for Enterprise Converged Communications for Services division
   - Security requirements and solution designs (2007)
3. SIP Server Enhancements (2005 - 2006) [link]
   - Session Border Controller Scalability
   - Programmable SIP Message Classification engine - this design / implementation is being incorporated into DataPower appliance
4. Enabling SIP applications (2003) - multi-player gaming, click-to-call, ad-hoc conferencing, community web-browsing. [link]

My university collaborations on converged communications include Georgia Tech (GTISC) on

- Dynamic State Management in SIP Servers [link]and

- Reputation schemes for Distributed Presence(with Prof M. Ahamad and Vijay Balasubramaniyan), and

with Prof Tom LaPorta at Penn State on Overload Control in IMS using our in-kernel SIP message classification.

My work also includes mobile / wireless networking [link] especially in cross-layer (layer2 and 3) wireless mesh network architectures. I hold a Visiting Professor position at the Wireless Information Networks Lab (WINLAB), Rutgers University and represented IBM Research in a $5.45 million, 4-year NSF testbed project for next-generation wireless networks and applications (ORBIT).

I have been involved with Services division over past many years, helping them with key consulting engagements as well as reference architectures for converged communications. In 2007, I am working with a cross-division team comprising of Internet Security Systems (ISS) and GTS among others, for a comprehensive technology document on security in converged communications. I am responsible for the Advanced Networking micropractice for On-Demand Innovation Services (ODIS) , for leveraging research expertise in services engagements [link].

I am active in the professional community, having given tutorials on both SIP/VoIP as well as mobile wireless networking in conferences such as ACM Multimedia 2005 and ACM Mobicom 1997. I will be speaking at panel in Voicecon 2007, titled "Software-based architecture and Unified Communications". I have been issued ten patents and have a number of conference/journal publications these areas. For conferences and workshops, I have organized, see here .

Further information on my work : SIP/ VoIP / IM / Presence , Mobile/wireless networking , MPLS , IPv6 , Content Distribution Networks (CDNs) , Web Switching

Education and Previous Employment

I received my B.Tech (Hons) in in Computer Science and Engineering from Indian Institute of Technology (IIT), Kharagpur in 1987. During my final year, I worked on Heuristic Algorithms in Artificial Intelligence applied to the 15-puzzle (paper) and Pattern recognition (paper).

 

I received my Phd in Computer Science from Rutgers University in Jan '95 in the area of mobile networking, under the supervision on Prof. B. R. Badrinath. I also worked with Prof. Tomasz Imielienski during my Phd.

PhD Thesis : Structuring Distributed Algorithms and Services in Networks with Mobile Hosts (Abstract) (Thesis)

I was briefly a Postdoctoral Research Associate between Feb-May 1995, at WINLAB (Wireless Information Networks Laboratory), Rutgers University. During this time, I worked on extending network-layer multicast protocols to wireless mobile hosts in the Internet [paper].

 

I joined NEC C&C Research Laboratories in Princeton, NJ as a Research Staff Member in May 95 in the Systems Architecture Department. I was responsible for the networking architecture for one of the first mobile broadband wireless system [papers] and also on Multi-Protocol Label Switching (MPLS) [papers]. I also took our work to the standards bodies such as the MPLS working group in the IETF and the wireless ATM group in the ATM Forum. I also worked on providing Quality of Service in mobile networks (MRSVP). Details of the work I did at NEC are available here.

 

I have been with IBM Research since Jan 2000. My work at IBM Research encompasses three areas : (a) SIP (Session Initiation Protocol) / VoIP / IM / Presence (b) Mobile Wireless Networking and (c) Various projects related to Internet Infrastructure.