Section: 6.50 Traffic steering and switching over two 3GPP access networks 6.50.2.1 General
Content: Subject to HPLMN policy and network control, the 5G system shall be able to support mechanisms to enable traffic steering and/or switching of a DualSteer device’s user data (for different services) across two 3GPP access networks belonging to the same PLMN (either HPLMN or VPLMN), assuming data anchoring in the HPLMN and non-simultaneous transmission over the two networks. Subject to HPLMN policy and network control, the 5G system may be able to support mechanisms to enable traffic steering and/or switching with simultaneous transmission of a DualSteer device’s user data (for different services) across two 3GPP access networks belonging to the same PLMN (either HPLMN or VPLMN), assuming data anchoring in the HPLMN. Subject to HPLMN policy and network control, the 5G system shall be able to support mechanisms to enable traffic steering and/or switching of a DualSteer device’s user data (for different services) across two 3GPP access networks belonging to two PLMNs, assuming a business/roaming agreement between PLMN operators (if different), data anchoring in the HPLMN and non-simultaneous transmission over the two networks. Subject to HPLMN policy and network control, the 5G system may be able to support mechanisms to enable traffic steering and/or switching with simultaneous transmission of a DualSteer device’s user data (for different services) across two 3GPP access networks belonging to two PLMNs, assuming a business/roaming agreement between PLMN operators (if different) and HPLMN data anchoring. NOTE 1: Inter-PLMN requirements can apply also to PLMN-NPN scenarios assuming a PLMN-integrated NPN (NPN hosted by a PLMN or offered as a slice of a PLMN). For traffic steering and/or switching of user data across two 3GPP access networks, the 5G system shall be able to allow a HPLMN to provide policies and criteria for a DualSteer device to connect to an additional PLMN/NPN, or an additional RAT within the same PLMN. NOTE 2: The above requirements assume configuration of traffic policies, under HPLMN control or negotiated between the HPLMN and other network operators, considering e.g., user subscription, application/traffic type, service preference, QoS requirements, location, time, UE capabilities, mobility, connectivity conditions. For any particular service, at any given time, the DualSteer device shall transmit all traffic of that service using only a single 3GPP access network.