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the mapping between the EXP field and DSCP of each packet on the entire network.
F. Overview
In the remainder of this section, we shall deal in details with the overview of what we
will deal with in the report. In the next section, we formulate our problem statement
based on the background that we have prepared in this section. Then in the section to follow
we study in detail the approach to our problem statement. In later section, we discuss
future work and conclusion, followed by reference section.
II . PROBLEM STATEMENT
A. Problem Formulation
With the rise of the internet and its success, the distributed systems in heterogenous
environments have become a norm. These distributed applications are usually built over
distributed middleware that makes the task of the programmer quite easy. This
middleware handles the complexity that orginates from the distributed and heterogenous
nature on behalf of the programmer and makes the application easier to implement and
allow them to inter-operate.
There are few applications which work sufficiently well in present networking
and operating platforms. But, there are enough applications which need to specify
their QoS requirements to the underlying network and recieve it. Best-effort networking
platforms are not sufficient for them. Thus, applications that require a certain level of QoS
must be able to specify their requirements in a clear and accurate manner by using QoS
parameters. The values of these parameters reflect the requirements of the application.
These parameters can be stored as a pre-defined user profile or can be obtained through
direct interaction with the user.
The acheivement of desired QoS is done by resource reser-vation of the underlying
networks and systems which include bandwidth, processing time, memory, hardware
etc. Such mechanism to reserve resources at the network level is done by different
resource reservation protocols like RSVP, Diff-Serv. But, the middleware needs to handle
the complexity of mapping the application level specification and requirement to
the underlying network QoS specification. These middlewares refered to as QoS
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