Access Traffic Steering
: The procedure that selects an access network for a new data flow and transfers the traffic of this data flow over the selected access network. Access traffic steering is applicable between 3GPP and non-3GPP accesses.
Access Traffic Switching
: The procedure that moves all traffic of an ongoing data flow from one access network to another access network in a way that maintains the continuity of the data flow. Access traffic switching is applicable between 3GPP and non-3GPP accesses.
Access Traffic Splitting
: The procedure that splits the traffic of a data flow across multiple access networks. When traffic splitting is applied to a data flow, some traffic of the data flow is transferred via one access and some other traffic of the same data flow is transferred via another access. Access traffic splitting is applicable between 3GPP and non3GPP accesses.
Multi-Access PDU Session
: A PDU session whose traffic can be sent over 3GPP access, or over non-3GPP access, or over both accesses.