Study on architecture enhancements for vehicle-mounted relays
The scope of this Technical Report is to study and identify potential architecture and system level enhancements for the 5G system to support the operation of base station relays mounted on vehicles, using NR for wireless access toward the UE and for wireless access through an IAB-donor toward the 5GC, i.e. in this release only IAB type relays based on the IAB architecture and functionalities specified in TS 23.501 [2] are studied. The study addresses the service requirements documented in TS 22.261 [3] for the mobile base station relays, and focuses on the following aspects:
- efficient mobility and service continuity for UE or a group of UEs to efficiently deliver data during different mobility scenarios (including mobility of the mobile base station relays);
- provisioning, policies and mechanisms to e.g. manage relay configuration, geographic restrictions, QoS, authorization and control of UEs' access via the mobile base station relay, etc.;
- support for roaming of mobile base station relay (including the roaming of the IAB-UE and gNB-DU in IAB-node), support for regulatory requirements (e.g. emergency, priority services, public safety), and support for location services for UEs accessing a mobile base station relay.