  Satellite networks play an indispensable role in providing global Internet
access and electronic connectivity. To achieve such a global communications,
provisioning of quality of service (QoS) within the advanced satellite systems
is the main requirement. One of the key mechanisms of implementing the quality
of service is traffic management. Traffic management becomes a crucial factor
in the case of satellite network because of the limited availability of their
resources. Currently, Internet Protocol (IP) only has minimal traffic
management capabilities and provides best effort services. In this paper, we
present broadband satellite network QoS model and simulated performance
results. In particular, we discuss the TCP flow aggregates performance for
their good behavior in the presence of competing UDP flow aggregates in the
same assured forwarding. We identify several factors that affect the
performance in the mixed environments and quantify their effects using a full
factorial design of experiment methodology.
