TKN EDCA Model for ns-2 Sven Wiethoelter, Marc Emmelmann ...
TKN EDCA Model for ns-2 Sven Wiethoelter, Marc Emmelmann ...
TKN EDCA Model for ns-2 Sven Wiethoelter, Marc Emmelmann ...
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
TU Berlin<br />
Throughput of all statio<strong>ns</strong> [Mbps]<br />
Delay [s]<br />
2.0<br />
1.5<br />
1.0<br />
0.5<br />
AC1: 128kbps, 80B MSDUs<br />
AC2: 160kbps, 200B MSDUs<br />
AC3: 160kbps, 200B MSDUs<br />
0.0<br />
0 2 4 6 8 10 12 14<br />
Number of statio<strong>ns</strong><br />
0.20<br />
0.15<br />
0.10<br />
0.05<br />
0.00<br />
(a) <strong>EDCA</strong><br />
Throughput of all statio<strong>ns</strong> [Mbps]<br />
2.0<br />
1.5<br />
1.0<br />
0.5<br />
AC1: 128kbps, 80B MSDUs<br />
AC2: 160kbps, 200B MSDUs<br />
AC3: 160kbps, 200B MSDUs<br />
0.0<br />
0 2 4 6 8 10 12 14<br />
Number of statio<strong>ns</strong><br />
(b) EDCF<br />
Figure 5.1: Accumulated MAC layer throughput of all statio<strong>ns</strong><br />
AC1: 128kbps, 80B MSDUs<br />
AC2: 160kbps, 200B MSDUs<br />
AC3: 160kbps, 200B MSDUs<br />
5 6 7 8 9 10 11 12 13 14 15<br />
Number of statio<strong>ns</strong><br />
(a) <strong>EDCA</strong><br />
Delay [s]<br />
0.20<br />
0.15<br />
0.10<br />
0.05<br />
0.00<br />
AC1: 128kbps, 80B MSDUs<br />
AC2: 160kbps, 200B MSDUs<br />
AC3: 160kbps, 200B MSDUs<br />
Figure 5.2: Access delay <strong>for</strong> each AC<br />
5 6 7 8 9 10 11 12 13 14 15<br />
Number of statio<strong>ns</strong><br />
(b) EDCF<br />
<strong>for</strong> medium access, (re)tra<strong>ns</strong>missio<strong>ns</strong>, as well as ACK reception <strong>for</strong> each AC. We investigated<br />
both metrics <strong>for</strong> the novel <strong>EDCA</strong> as well as the EDCF model with <strong>ns</strong>-2.28.<br />
The Akaroa tool [4] was used <strong>for</strong> evaluation of results, run-length control, as well as<br />
parallelized simulation ru<strong>ns</strong> with the MRIP (Multiple Replicatio<strong>ns</strong> in Parallel) capability.<br />
The simulation process terminates, if the mean value reaches a confidence level of 95percent<br />
and has a relative error below 5percent.<br />
For each simulation run, the number of contending statio<strong>ns</strong> was increased by one. Figure<br />
5.1(b) shows the total throughput <strong>for</strong> EDCF. The high-priority flows are not affected,<br />
i.e., throughput is not decreased even <strong>for</strong> the highest number of 15 statio<strong>ns</strong> tra<strong>ns</strong>mitting<br />
Copyright at Technical University<br />
Berlin. All Rights reserved.<br />
<strong>TKN</strong>-06-003 Page 12