Mobility on Junos Multi-Access User Plane

Junos OS introduced Junos Multi-Access User Plane supporting a combined SGW-U/PGW-U (SAEGW-U) on routers in accordance with 3GPP Release 14 CUPS architecture. This provided high-throughput 4G and 5G fixed-wireless access service with support for 5G non-stand-alone (NSA) mode. Junos OS introduce support for running on devices as either a standalone SGW-U or a standalone PGW-U or a combined SAEGW-U to provide high-throughput 4G and 5G mobility service (relocation of a UE to a new eNodeB, new SGW-U, or new SAEGW-U). This includes support for GTP-U based S5-U and S8-U interfaces, to provide links between SGW-U and PGW-U devices, and tunnel relay functionality to forward user plane traffic between S1-U and S5-U/S8-U interfaces or between S5-U/S8-U and SGi interfaces respectively. We support the following mobility scenarios:

• Handover with eNodeB and no SGW change
• Handover with SGW change (direct forwarding)
• Handover with SGW change (indirect forwarding)