TITRE Adaptive Packet Video Streaming Over IP Networks - LaBRI

Figure 4-6: Experiment testbed
In the current testbed, we have modeled the Diffserv class by some metrics, which are
described in Table 4-2. We have define five different Diffserv QoS classes corresponding to EF
(Expedited Forwarding), AF11 (Gold Service), AF12 (Silver Service), AF13 (Bronze Service), and
finally BE (Best Effort Service). The transmitted video packets are marked according to two
scenarios. In scenario 1, the classification layer affects the relative priority score to each packet
which is mapped to the Diffserv network. In scenario 2, video stream are marked using classical
marking algorithm such as Time Sliding Window Three Color Marker (TSWTCM) [130] as
explained in details in Chapter 5.
The metrics used to setup the Diffserv domain are taken from [155] and are listed bellow:
(1) IPTD: IP packet transfer delay,
(2) IPDV: IP packet delay variation,
(3) IPLR: IP packet loss ratio,
(4) IPER: IP packet error ratio,
(5) BW: Bandwidth used.
QoS Classes
Network EF AF11 AF12 AF13 Best Effort
Performance
Parameter
IPTD 100ms 150ms 200ms 300ms Unspecified
IPDV 50ms 50ms Unspecified Unspecified Unspecified
IPLR 1*10 -3 1*10 -3 2*10 -3 3*10 -3 Unspecified
IPER 1*10 -4 Unspecified
BW 1,5Mbits 1,5Mbits 1,5Mbits 1,5Mbits 4Mbits
Table 4-2: IP Diffserv QoS class definitions
71