Samsung is known on the telecommunications market mainly for the production of smartphones and chipsets for mobile devices. However, Koreans also try their best as a supplier of telecommunications equipment for mobile network operators. That is why Samsung is working on 5G technology not in the development of new smartphones, but also in base stations and core network elements. Recently, Samsung has presented the results of 5G tests on a regular train in Japan.
Samsung engineers carry out their experiments on 5G solutions together with the Japanese operator KDDI. In the first quarter of this year, KDDI and Samsung successfully tested the mobility of the 5G network using the 28 GHz band. It was a rather simplified scenario, which checked the switching of the 5G terminal located in a car moving at a speed not exceeding 60 kph. It was not much, but Samsung had to start from some level. Subsequent tests were carried out on the racetrack, where vehicles with 5G mounted roof antennas could reach speeds of 190 kph and maintain stable connectivity.
Samsung has a rather interesting application for trains equipped with 5G antennas.
The 28 GHz millimeter band will be used to provide Internet access service in the United States by one operator, but as fixed wireless service. The second scenario of using this range of radio waves in 5G systems are densely located antennas (e.g. in a shopping centre) with a small range. In contrast, Samsung and KDDI think about using 5G as an Internet connection in public transport, including fast-moving trains. However, passengers would not connect to the 5G network directly, but for example with Wi-Fi hotspots that would be connected to a 5G modem. This approach allows for installation of 5G antenna on the roof of the train, which will easily receive a strong signal even from distant base stations.
Samsung and KDDI tested this solution between October 17 and October 19 this year in the Japanese city of Saitama near Tokyo. Samsung provided all the elements of the pre-commercial 5G system, i.e. the 5G CPE type router, 5G base stations and virtualized network elements. The train moved at a speed exceeding 100 kph, and the 5G test system was located on the 1.5 km section. During the tests, the speed of 1.7 Gbps was achieved. Demonstrated system allows simultaneous download of video in 8K resolution (it is not known whether it was compressed or not) and sending 4K recordings from the camera installed on the train. This scenario of the 5G network application is quite interesting. KDDI customers will be able to enjoy the benefits of the new technology without having support devices cooperating with it.