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On the other hand, the virtual collision probability should also enlarge with the number of AC-traffic flows and their flow rates similarly.
The 802.11e standard suggests a specific access category (AC) for video traffic and recommends priorities 4 and 5 for video.
However, there is the need to assess if using the voice AC to transfer VoIP traffic according to a realistic CODEC model is less damaging to the transfer of RT traffic.
Different contention parameters can be tuned adaptively for each access category (AC) to treat the traffic flows differently.
An obvious problem for 802.11e lies in the fact that the reserved AC queue for video traffic, i.e., AC[2], is FIFO based, and thus no room is available for further differentiation among video packets themselves based on their importance level which is inferable by a modern video coding technology from the application layer.
For the sake of comparison, all three ACs benefit from the same traffic load condition.
Avoid locations near AC vents, heaters, fireplaces, high-traffic doors, and rooms with large windows.
AC is the classification of different traffic classes in order to serve them with different requirements.
In WMNs, admission control (AC) is one of the key traffic management mechanisms that should be deployed to provide quality of service (QoS) support for real-time traffic.
We tackle this point, by proposing in this study a new Admission Control (AC) that improves the QoS of BE traffic by avoiding a strict bandwidth assignment of other traffics (rtPS and nrtPS) as is defined in major previous studies.
Figure 15 Time averaged queue length of ACs versus congestion case of cross traffic for various input rates of video source: (a) 512 kbps, and (b) 128 kbps.
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