5GPPP Architecture WG has released “5G Architecture White Paper v2.0.” This paper highlights the key 5G architecture design recommendations from 5GPPP Phase 1 and provides a baseline architecture for Phases 2 and 3.
https://5g-ppp.eu/wp-content/uploads/2018/01/5G-PPP-5G-Architecture-White-Paper-Jan-2018-v2.0.pdf