Hello, everyone!
Today, I would like to continue on the novel features ot the IEEE 802.11aa amendment.
Stream classification service (SCS).
The SCS is a supplementary service that an Access point can give to linked stations to categorize multimedia streams based on subjective rules defined directly by the stations rather than the standard 802.1D user prioritization.
Figure 1: Prioritization of inter-AC traffics and stream classification
To accomplish this, the station seeking SCS must transmit a SCS request frame to the Access points, which includes an identification for the SCS stream as well as a descriptor for the classification model. The Access point has the option of accepting or rejecting the station's requests.
The Access point must then allocate all frames that fulfill the classification rule to a certain AC once it has been validated. Identical frames can also be allocated to the primary or secondary transmit queues when intra-access category prioritization is enabled, allowing for fine - grained prioritization.
Lastly, the SCS description has a Drop Eligibility Indicator (DEI) bit that specifies if frames from this traffic stream could be dropped if resources are insufficient. Since the maximum number of allowable retransmissions is fewer than the default, frames with the DEI bit set to one have a better likelihood of being rejected.
The IEEE 802.11aa specification does not cover how to integrate intra-AC queues and frame dropping parameters to achieve smooth deterioration of audio/video stream quality in the event of a bandwidth bottleneck.
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