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4.1 Support for Edge Computing in 3GPP

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In the 5G system specifications there is a set of new functionalities that serves as enablers for edge computing. These enablers are essential for integrated MEC deployments in 5G networks. This white paper is focused primarily on utilizing these edge computing enablers. The full list of enablers with brief explanations can be found in clause 5.13 of [10].

1. Local Routing and Traffic Steering: the 5G Core Network provides the means to select traffic to be routed to the applications in the local data network. A PDU Session may have multiple N6 interfaces towards the data network. The UPFs that terminate these interfaces are said to support PDU Session Anchor functionality. Traffic steering by the UPF is supported by Uplink Classifiers that operate on a set of traffic filters matching the steered traffic, see clause 5.6.4.2 of [10] or alternatively by IPv6 multi-homing, where multiple IPv6 prefixes have been associated with the PDU session in question, see clause 5.6.4.3 of [10].
2. The ability of an Application Function to influence UPF (re)selection and traffic routing directly via the Policy Control Function (PCF) or indirectly via the Network Exposure Function (NEF), depending on the operator’s policies, see clause 5.6.7 of [10].
3. The Session and Service Continuity (SSC) modes for different UE and application mobility scenarios. Description of the SSC modes 1, 2 and 3 is found in clause 5.6.9 of [10]
4. Support of Local Area Data Network (LADN) by the 5G Core Network by providing support to connect to the LADN in a certain area where the applications are deployed. The access to a LADN is only available in a specific LADN service area, defined as a set of Tracking Areas in the serving PLMN of the UE. LADN is a service provided by the serving PLMN of the UE, see section 5.6.5 of [10].