The SaMOG Gateway supports DSCP marking on the uplink and downlink data packets. Service providers can use this feature to prioritize traffic across intermediate routers and deliver QoS services to subscribers. In an ePDG and SaMOG cascading network architecture for a Voice over WiFi (VoWiFi) over WLAN access, the SaMOG Gateway performs DSCP marking and prioritization to VoWiFi traffic using the Flow-based Local Breakout (LBO).
DSCP marking is supported on the EoGRE, PMIPv6, and L3-IP network access types, and GTP-U (GGSN-GTPv1 and PGW-GTPv2) and GRE (PMIPv6-based S2a) S2a-U variants on the network side. SaMOG can perform DSCP marking on IPv4, IPv6, and dual PDNs.
Relationship to Other Features
Flow-based Local Breakout
In an ePDG cascading architecture with SaMOG for VoWiFi over trusted WLAN access, DSCP marking in the SaMOG Flow-based LBO model ensures that the desired DSCP marking is performed by ePDG in the downlink packets towards the TWAN in the access network.
The QCI-QoS-Map table will be restored for the recreated session after session recovery. DSCP values are applied to the consecutive traffic based on the QCI-QoS mapping table configuration during the time of session recovery.
DSCP marking will not be performed to the traffic redirected to the web portal during the pre-authentication phase. The traffic from the UE session in this phase is intended for session establishment and authorization, and has no QCI value. DSCP marking will be performed on the subscriber traffic during the TAL phase.
During reauthorization, if the QCI value is modified for the subscriber call, the new QCI’s DSCP value will be applied.