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or nrtPS etc. which is associated to the specific
healthcare application. Thus, this simulation ap-
proach means that the ES required for delivery
of a data flow generated from a defined object
with specific behaviour would get appropriate
scheduling service as an individual stream with
QoS-based application requirements.
In the first scenario we establish 3 connections
with different service classes, as indicated in Table
1. We narrowed the system available resources
from the Total bandwidth BDW =4 Mb to BDW=
3Mb, aiming to estimate the overall throughput
and compare per connection behaviour in the hard
channel conditions.
As depicted from the Figure 3, the overall
throughput has similar indicators for the edged
total bandwidth, despite the fact, that system
capacity of 3Mb is able to offer slightly less avail-
able resources for the required distribution of 3,02
Mb total load with 3 concurrent active connections
for UGS, rtPS and BE respectively. However, we
can point out some higher throughput deviations
for the BDW=3MB resulted from a lack of avail-
able spectrum in comparison with test figures for
BDW=4Mb settings.
The experimental findings just confirm the
predictable expectations that extra system capac-
ity ensure required throughput for each connection.
Thus, 1-2% spectrum starvation is not able to
seriously affect common system performance.
Per-connection throughput for UGS and rtPS
connections demonstrates comparative stability
during the whole simulation, but BE throughput
has dropped to just 40% down for the narrowed
system bandwidth of 3Mb, as illustrated in Figure
4. These results confirm the WRR scheduling
behaviour, so in bandwidth starvation the sched-
uler first services connections with higher prior-
ity- UGS and rtPS, then, rest of resources would
be allocated to lower prioritised BE connection.
The next set of tests was aimed at relative
comparison of system summary and connection-
oriented throughput parameters under scenario
Table 1. Test parameters for the 1st Scenario
Service Class
Packet size, Byte
Data rate, Mbps
UGS
200
2
rtPS
150
1
Be
40
0,02
Figure 3. System overall throughput comparison for variable bandwidth
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