Title:		Traffic Control and QoS Management In the Internet
======

Speaker:	Hui Zhang, Carnegie Mellon University
========

Abstract
========

Due to the success of Internet, we see two important trends: first, the
Internet is involving into a global and commercial communication
infrastructure, second, the Internet technology is now the technical
basis for not only the Internet but also for most data communication
networks, both public and private.

These new developments are stretching the limits of the original design
of TCP/IP along all possible dimensions. In particular, the best-effort
service model and the end-system-only (cooperating TCP sources) traffic
management scheme are no longer adequate.  New service models and 
sophisticated resource management algorithms and protocols have been 
developed.  In this tutorial, we will give an overview of the service models, 
algorithms, and protocols that have been developed in recent years to cope 
with emerging applications, and new business and administrative requirements. 
Throughout the tutorial, we will discuss the architectural implications of 
the new algorithms/protocols/service models, including their impact on the 
following important goals for Internet: scalability, robustness, heterogeneity.



Outline
=======

      Introduction
          o IP protocol and service model 
          o traffic control in today's Internet
          o limitations of existing model and algorithm

      Techniques to improve best-effort service
          o new TCP algorithms
              -- SACK, Vegas
              -- Jenny Ho's algorithm
              -- techniques to avoid timeout triggered retransmission
                    (Berkeley, Harvard work)
              -- techniques to improve TCP performance in wireless
networks
          o new router mechanisms
              -- buffer management: RED, FRED
              -- queueing scheduling discipline: Fair Queueing
              -- interaction between scheduling and buffer management
              -- congestion notification bit
                      
      Integrated Services
          o Intserv model: guaranteed, controlled load
          o Reservation protocol: RSVP
          o Scheduling algorithms 
              -- Weighted Fair Queueing and its variants
              -- Rate-controlled Service Disciplines
          o Admission control algorithms
              -- analysis based admission control
              -- measurement based admission control
          o Link sharing service and algorithms
              -- Class Based Queueing (CBQ)
              -- Hierarchical Fair Queueing
          o QoS routing

       Differential Services
          o Differential service models
          o Sender vs. receiver payment
          o Router mechanisms and behaviors
          o Provisioning algorithms
          o relationship between diffserv and intserv
          o end-to-end traffic management and diffserv
      
       
      Discussion
          o Adaptive applications and network resource management
          o Design alternatives and future directions


Biography of Speaker
=====================

Hui Zhang is an assistant professor at the School of Computer Science 
of Carnegie Mellon University. He received his Ph.D. degree in Computer 
Science from the University of California at Berkeley. Before joining
the faculty at CMU in 1995, he spent one year at the Lawrence Berkeley
National Laboratory as a Post Doctoral Fellow. 

Professor Hui Zhang has conducted research in the area of resource
management algorithms and protocols for wide-area internetworks for the 
last 8 years. His research includes scheduling, traffic characterization, 
admission control, routing, congestion control, reliable multicasting
algorithms, and real-time protocols. Professor Zhang received the National 
Science Foundation CAREER Award in 1996.

=============================== END =====================================