IPLOOK LOGO
IPLOOK-LOGO

How does the 5G roaming process ork?

Table of Contents

8ed640f5f6

5G (NR) Roaming: Definition and Complete Implementation Process

5G (NR) roaming refers to a terminal (UE) that moves from its Home Public Land Mobile Network (HPLMN) to a Visited PLMN (VPLMN) and continues accessing 5G services through other operator‘s network.

5G (NR) roaming process works as below:

5G Roaming System Architecture

  1. UE powers on and searches for a signal.
  2. UE selects the VPLMN based on roaming agreements.
  3. UE sends an attach request to VPLMN through the RAN.
  4. AMF in VPLMN sends an authentication request to HPLMN.
  5. AUSF and UDM in HPLMN authenticate UE.
  6. Home Security Edge Protection Proxy (hSEPP) ensures secure communication with VPLMN.
  7. Visited SEPP (vSEPP) receives an authentication response, ensuring secure inter-network communication.
  8. AMF and SMF in VPLMN establish sessions for the UE.
  9. NSSF selects the appropriate network slice.
  10. PCF manages session application policies and billing rules.
  11. Data is routed via UPF, which in VPLMN routes data from the UE directly to the data network (DN), enabling local breakout.
  12. UE accesses the internet through the DN.

Click to explore more 5G features of IPLOOK’s 5GC here.