Section: 6.42.1 Description
Content: The requirements below refer to a “mobile base station relay”, which is a mobile base station acting as a relay between a UE and the 5G network, i.e. providing a NR access link to UEs and connected wirelessly (using NR) through a donor NG-RAN to the 5G Core. Such mobile base station relay is assumed to be mounted on a moving vehicle and serve UEs that can be located inside or outside the vehicle (or entering/leaving the vehicle). NOTE: The radio link used between a mobile base station relay and served UEs, as well as between mobile base station relay and donor RAN, is assumed to be NR-Uu; in that regard, it should be clear that a mobile base station relay is different than a UE relay (which uses instead a PC5-based link to provide indirect connection to remote UEs). Few main underlying assumptions are: - requirements cover single-hop relay scenarios as baseline (multi-hop is not precluded); - legacy UEs are supported; - other stage-1 requirements (e.g. on wireless self-backhaul), as well as existing stage-2/3 functionalities and architecture options (e.g. IAB) do not assume or address full relay mobility (e.g. relays on board of moving vehicles), thus cannot cover the requirements below, which are intended to be specific to mobile base station relays; - the identified requirements do not intend to imply or exclude specific network/relay architectures and topology solutions (e.g. could be IAB based, or others); - the MNO managing mobile base station relays, and the RAN/5GC they connect to, can be a PLMN or an NPN operator.