1. 3GPP. System Architecture for the 5G System (Release 15). TS 23.501.
2. 3GPP. Procedures for the 5G System (Release 15). TS 23.502.
3. 3GPP. Policy and Charging Control Framework for the 5G System (Release 15). TR 23.503.
4. 3GPP. Study on Access Traffic Steering, Switch and Splitting support in the 5G system architecture (Release 15). TR 23.793.
5. BBF. Hybrid Access Broadband Network Architecture. TR-348.