Abstract
The Traffic Flow Description (TFD) option of the IP
protocol is an experimental option, designed by the Authors and
described by the IETF’s Internet Draft. This option was intended
for signalling for QoS purposes. Knowledge about forthcoming
traffic (such as the amount of data that will be transferred in
a given period of time) is conveyed in the fields of the option
between end-systems. TFD-capable routers on a path (or a
multicast tree) between the sender and receiver(s) are able to read
this information, process it and use it for bandwidth allocation. If
the time horizons are short enough, bandwidth allocation will be
performed dynamically. In the paper a performance evaluation
of an HD video transmission QoS assured with the use of the
TFD option is presented. The analysis was made for a variable
number of video streams and a variable number of TCP flows
that compete with the videos for the bandwidth of the shared
link. Results show that the dynamic bandwidth allocation using
the TFD option better assures the QoS of HD video than the
classic solution, based on the RSVP protocol.
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