New QoS Features Added to the Wi-Fi QoS Management Program
The Wi-Fi Alliance announced today, Thursday, 21 October 2022 new QoS features added to the Wi-Fi QoS Management program:
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The new features bring added granularity to help deliver consistent QoS treatments in Wi-Fi networks.
The New Features Are:
Stream Classification Service (SCS)
That is similar to MSCS (from the previous release) whereas with MSCS the AP implicitly derives QoS rules by monitoring the corresponding uplink IP flows, with SCS the request from the STA explicitly provides the AP with the IP classifier and User Priority for each downlink IP flow.
Since SCS allows a rule classifier to be defined based on parameters in protocol/extension headers (in addition to IP tuple parameters), it can support use cases such as QoS differentiation in Wi-Fi access to 3GPP 5G core networks, where IPsec with multiple child SAs is used between the client device and the N3IWF or TNGF gateway
The DSCP Policy
This feature enables an AP to request a client device to apply DSCP marking to specific uplink traffic flows, which are identified by a classifier based on IP tuple, port range, and/or destination domain name. The DSCP Policy feature can be used in conjunction with QoS Map, where the former specifies the DSCP marking rules and the latter provides the mapping from DSCP marking to User Priority
The Features in Wi-Fi QoS Management are:
Mirrored Stream Classification Service (MSCS):
enables a client device to request the AP to apply specific QoS treatment of downlink IP data flows using QoS mirroring
Stream Classification Service (SCS):
enables a client device to request the AP to apply specific QoS treatment of downlink IP data flows using IP classifiers
Differentiated Service Code Point (DSCP) mapping:
adopted a default mapping to align QoS treatment across Wi-Fi and wired networks;
added QoS Map feature enables network managers to configure specific DSCP to QoS mapping tables for APs and client devices
DSCP Policy:
enable the network to request a client device to apply DSCP marking policies to uplink IP data flows
