## 5 Testbed Demonstration Setup
### Mobile Edge Node Demo: Connectivity on the Move  
The second over-the-air demonstration showed 5G connectivity \"on the move\" with a SATCOM-equipped van. This scenario could be envisioned as a use case for _Comms on the Move_ in a disaster relief situation or in areas where the terrestrial backhaul infrastructure has been damaged or is still too expensive to deploy. Possible applications are eHealth, rapid emergency response, and temporary deployments for public events. _Comms on the Move_ have to manage an unstable backhaul where communication may be blocked for variable duration's of time due to shadowing. The van can be used to set up a standalone cell wherever a LoS connection to a satellite is available. In the case of a connection to a MNO network, the data traffic can be backhauled on top of this terrestrial network, as shown in Figure 14.  
To demonstrate the showcase, an Accelleran E1011 eNB was deployed in the van with a Satcom on the Move (SOTM) terminal from the Munich Center for Space Communications, a major research facility for satellite communications located at the Bundeswehr University Munich (UniBw) in Neubiberg, Germany [31]. During the testbed demonstration, the LTE band 43 (3.6 GHz to 3.8 GHz) was assigned from the German regulatory agency for test purposes. For the UE, the Essential PH-1 smartphone was selected because it phone is one of the few devices that supports LTE band 43. The edge node was running on a Lenovo ThinkPad X240 with Ubuntu 16.04. In addition, two Huawei E3372 Mobile Broadband LTE modems were connected with the edge node via USB to backhaul data traffic if the satellite backhaul was unavailable. In case a LoS connection to the satellite, the SOTM terminal on top of the van was utilized. This SOTM antenna features multiple on-board tracking sensors, enabling accurate tracking, short initial acquisition and instantaneous re-acquisition. The transmitting and receiving Earth station was a 4.6 m offset Gregorian antenna. Specifically, during the over-the-air tests, the satellite backhaul was implemented through geostationary satellite capacity provided through UniBw in the Ku-band. A small satellite bandwidth of 200 kHz was allocated to the forward link carrier and 200 kHz bandwidth was allocated to the return link carrier. For the uplink of the forward link, a center frequency of 14.34 GHz was assigned by the operator. This frequency has been converted to 11.54 GHz downlink frequency. The SATCOM modem in Munich was configured to provide access to the central node in Berlin with Public IP over the Internet. The edge node was connected through an OpenVPN connection to the central node in Berlin, which includes the main core network functions. In the case both backhauls are available, the edge node could split user plane and control plane separately to send the data to the central node over different physical paths. Figure 13: Showcase of the seamless satellite integrationFigure 14: 5G connectivity on the move demo: SATis5 testbed demo architecture (Setup 2). Figure 15: 5G connectivity on the move demo: hardware setup of the SATis5 testbed. (**a**) SATCOM Van; (**b**) Mobile base station deployment showcase; (**c**) 4.6 m Earth station antenna; (**d**) SOTM antenna. A testbed demonstration architecture with edge node capabilities has been developed, to demonstrate the benefits of satellite technologies in a 5G environment, as shown in Figure 15. During this scenario, the SOTM vehicle was parked in Berlin, Germany (\(52.53^{\circ}N\)\(13.32^{\circ}E\)). Line-of-sight to the satellite was given. Shadowing of the SATCOM link occurred occasionally through passing high-build vehicles such as trucks, delivery vans and buses. In the case of shadowing the reconnecting of to UE to the core network took a few seconds (hold mode of the antenna) or less than one minute (search mode of the antenna), depending on the length of the previous shadowing period. The specific processes for service deactivation, handover and tracking updates worked as expected.