Section: 6.35 Service Function Chaining 6.35.2 General Requirements
Content: The following requirements apply for supporting enhancement of service function chaining for 5G networks: - The network operator shall be able to define and modify service function chaining policies for steering traffic on per application per UE basis through required service function chaining with ordered service functions to improve the user’s QoE. - Service functions chaining policies shall be able to distinguish between upstream and downstream traffic. - The coexistence of traffic with and without service function chaining shall be supported. - Service function chaining shall provide suitable means for authorized third parties to request a chain of service functions provided by the network operator based on operator’s service function chaining policies. - In case of roaming, the HPLMN shall be able to apply traffic steering policies and service function chaining polices for home routed traffic. - In case of roaming with local breakout, the HPLMN shall be able to provide the traffic steering policies and service function chaining policies to the VPLMN providing local breakout with support of service function chaining. - Service function chaining shall support deployments where the Hosted Services are provided by the operator and deployments where the Hosted Services are provided by a third party.