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During the network migration to 5GC, it is possible for operators to deploy separate HSS and UDM/UDR in e.g. multi-vendor scenario. This document describes the scenarios of separate UDM and HSS with separate repositories and with a common repository, and provides the corresponding solutions for these scenarios.
This Technical Report describes scenarios for co-existence of subscription data pertaining to legacy system (EPS) with data pertaining to the 5G system, when the HSS+UDM defined in Rel-15 is separated and both UDM and HSS are independent, and provides solutions to support this deployment where necessary.
NOTE: The subscription data referred to by this Technical Report comprises both static as well as dynamic data, including IMS, LCS, SMS data.
This technical report includes:
diverse scenarios related to the storage of subscription data including, but not limited to, those of common repository for subscription data from EPS and 5GS, as well as separate repositories for EPS and 5GS subscription data; and
the solutions supporting relevant procedures in TS 23.502 (for e.g. authentication, mobility, handover and procedures for IMS and SMS handling in interworking between 5G system and EPS),
full Table of Contents for TR 23.973 Word version: 16.1.0