Research Interests:

• Modeling and analysis of mobile, wireless, ad hoc and sensor networks; pervasive computing
• Integrated network infrastructure design and performance enhancement across network layers, applications and heterogeneous networks
• Network and mobility management, QoS, signaling and control
• Adaptive network services, multimedia services and protocols over wired and wireless networks
• Peer-to-peer networks; application and service support over Internet and wireless data networks

Projects:

My Recent Projects at Bell Labs

My Past Projects at Columbia:

• RNAP: A Resource Negotiation and Pricing Protocol
 
• IP Multicast Fault Tolerance
 
• Measurement and Analysis of LDAP Performance

Journal/Book Publications

• S. Kasera, R. Ramjee, S. Thuel, X. Wang, ``Congestion Control Policies for IP-based CDMA Radio Access Network,'' submitted to IEEE Transactions on Mobile Computing
• X. Wang, H. Schulzrinne,  ``An Integrated Resource Negotiation, Pricing, and QoS Adaptation Framework for Multimedia Applications,'' In IEEE Journal on Selected Areas in Communications (JSAC) , vol. 18, 2000. Special Issue on Internet QoS.
• X. Wang, H. Schulzrinne,  ``Comparison of Adaptive Internet Multimedia Applications,'' In IEICE Transactions on Communications , Vol. E82-B, No. 6, pp. 806--818, June 1999.
• X. Wang, I. Stavrakakis,  ``Study of Scheduling for Group-based Quality of Service Delivery,'' In Third Volume on Performance Modeling and Evaluation of ATM Networks, D. Kouvatsos, Champman & Hall, Chap. 5, pp. 362--379, 1997.
• X. Wang, L. Zhang, ``A High-Quality Medium-Rate Speech Vector Quantizer,'' In Journal of Beijing University of Posts & Telecommunications, Vol. 15, No 1, 1992.

Conference Publications

• S. Kasera, R. Ramjee, S. Thuel, X. Wang, ``Congestion Control Policies for IP-based CDMA Radio Access Network,'' In Proceeding of INFOCOM'2003 , San Francisco, March 2003.
• G. Gopalakrishnan, S. Kasear, C. Loader, X. Wang ``Robust Router Overload Control Using Acceptance and Departure Rate Measures,'' to appear in 18th International Teletraffic Congress (ITC-18), Berlin, Germany, Aug. 2003.
• X. Wang, H. Schulzrinne, ``Auction or Tatonnement - Finding Congestion Prices for Adaptive Applications,'' short paper in 10th International Conference on Network Protocols (ICNP'2002), Paris, France, Nov. 2002.
• X. Wang, H. Schulzrinne,  ``Pricing Network Resources for Adaptive Applications in a Differentiated Services Network,'' In Proceeding of INFOCOM'2001 , Anchorage, Alaska, Apr. 2001.
• X. Wang, H. Schulzrinne, D. kandlur, D. Verma,   ``Measurement and Analysis of LDAP Performance,'' In International Conference on Measurement and Modeling of Computer Systems (SIGMETRICS'2000), Santa Clara, CA, pp. 156--165, Jun. 2000.
• X. Wang, C. Yu, H. Schulzrinne, P. Stirpe, W. Wu   ``IP Multicast Fault Recovery in PIM over OSPF,'' In 8th International Conference on Network Protocols (ICNP'2000), Osaka, Japan, Nov. 2000. Also appears as short paper in International Conference on Measurement and Modeling of Computer Systems (SIGMETRICS'2000), Santa Clara, CA, Jun. 2000.
• M. Chan, Y. J.Lin, X. Wang, "On Reducing QoS Data Exchange in Monitoring Flows with Service Level Agreements,'' In 8th International Conference on Network Protocols (ICNP'2000), Osaka, Japan, Nov. 2000.
• X. Wang, H. Schulzrinne,  ``Performance Study of Congestion Price based Adaptive Service,'' In Proc. International Workshop on Network and Operating System Support for Digital Audio and Video (NOSSDAV'00), Chapel Hill, NC., pp. 1--10, Jun. 2000.
• X. Wang, H. Schulzrinne,  ``Adaptive Reservation: A New Framework for Multimedia Adaptation,'' In IEEE International Conference on Multimedia and Expo. (ICME'2000) , (New York City, New York), July, 2000.
• X. Wang, H. Schulzrinne,  ``RNAP: A Resource Negotiation and Pricing Protocol,'' In Proc. International Workshop on Network and Operating System Support for Digital Audio and Video (NOSSDAV'99), (Basking Ridge, New Jersey), pp. 77--93, Jun. 1999.
• X. Wang , I. Stavrakakis,  ``An Efficient VBR Traffic Scheduling Policy using Dynamic Bandwidth Allocation,'' In 4th IFIP Workshop on Performance Modeling and Evaluation of ATM Networks, July 8-10, 1996, W. Yorkshire, U.K.
• X. Wang, J. Zhang, W. Zhu, ``64 Kb/s Motion Videophone Hardware System Design,'' In The 6th National Conference on Speech and Image Communications, Beijing, China, 1993.
• X. Wang, J. Li, W. Zhu, J. Zhang, ``Using TMS 320C25 to Realize 64Kb/s Motion Videophone Decoder,'' In The 6th National United Conference on Multimedia Communications, Beijing, China, 1993.

Paper under Submission

• X. Wang, R. Ramjee, ``A Predictive and Adaptive Resource Management Scheme for CDMA Downlink Data and Voice,'' to be submitted.

Workshop Publications and Presentations

• X. Wang, H. Schulzrinne, ``Resource Negotiation and Pricing in Diffserv for Adaptive Multimedia Applications,'', In First NY Metro Area Networking Workshop, IBM T. J Watson Research Center, Hawthorne, New York, Mar 2001
• X. Wang, H. Schulzrinne, ``RNAP: A Framework for Congestion-Based Pricing and Charging for Adaptive Multimedia Applications,''First International Workshop Quality of future Internet Services (QofIS'2000), Berlin, Germany, Sep. 2000
• X. Wang, H. Schulzrinne, ``Resource Negotiation and Pricing Protocol,'' In Internet2 Network Research Workshop, Chicago, June 2000.
• X. Wang, ``VBR Video Traffic Modeling for Multiplexing in ATM Networks,'' In Northeastern University CDSP Workshop, Henderson House, Weston, MA, 1995.

Technical Report:

• X. Wang, H. Schulzrinne, ``A Framework for Resource Negotiation and Pricing in the Internet,'' Columbia Technical Report. CUCS-008-00, Apr. 2000.
• X. Wang, H. Schulzrinne, ``Incentive-Compatible Adaptation of Internet Real-Time Multimedia,'' Columbia Technical Report. CUCS-009-00, Apr. 2000.
• X. Wang, H. Schulzrinne, ``Performance Study of Congestion Price based Adaptive Service,'' Columbia Technical Report. CUCS-010-00, Apr. 2000.

Invited Talks:

• X. Wang, H. Schulzrinne, "An Integrated Resource Negotiation, Pricing, and Quality of Service Framework for Adaptive Multimedia Applications," Sun Microsystems, San Jose, CA., Aug. 2000.
• X. Wang, H. Schulzrinne, "Measurement and Analysis of LDAP Performance," Sun Microsystems, San Jose, CA, Aug. 2000.
• X. Wang, H. Schulzrinne, "Resource Negotiation, Pricing, and Quality of Service for Adaptive Multimedia Applications," Sprint Advanced Technology Labs, Burlingame, California, Feb. 2001
• X. Wang, H. Schulzrinne, "Integrated Resource Negotiation, Pricing, and Quality of Service for Adaptive Multimedia Applications," PacketVideo, Rochelle Park, New Jersey, Mar. 2001

Last Updated: 11/02