cabins

High-speed rail is going through a phase of maturity where the differential is no longer so much speed, but rather productivity and comfort. In short: it wants to become a fully fledged alternative to flying in the business segment. While Spain is consolidated as the second country in the world in high-speed network and leader in technological interoperability, Japan (which was a pioneer with the Shinkansen in 1964) wants to regain its hegemony with deep digitalization. JR Central, the rail operator of the Tokaido Shinkansen, has announced which will equip the next premium suites of its famous bullet trains with windows with integrated 5G antennas and active ambient noise cancellation without the need for headphones. The news. The improvements are not cosmetic, but a serious commitment to transform the premium car into a work or rest environment comparable to a private office. 5G antennas on the glass. The technology is provided by AGCa Japanese company that weaves conductive microfibers into the glass to form an antenna that is connected to the on-board Wi-Fi router. While conventional systems bounce the 5G signal inside the train before reaching the router, antennas integrated into the glass keep direct line of sight with outside base stations. That is, a more stable Wi-Fi with a stronger signal. Integrated ANC. The system is called Personalized Sound Zone (PSZ) and has been developed by NTT. Its operation is like that of headphones with active cancellation: it detects the waveform of the ambient sound and from there, projects its inversion to cancel it. The main difference is that you don’t need to cover your ear: it uses a combination of microphones, speakers and spatially optimized low-latency processing. Why is it important. JR Central’s bullet train reaches speeds of up to 285 km/h, meaning it passes mobile network base stations so quickly that it often needs to reconnect to another radio. This phenomenon is known as handover and degrades the quality of the connection: it is the Achilles heel of connectivity in high-speed trains around the world. Yes, those internet outages also happen on the AVE. Finding a solution in windows is technically elegant and scalable. From the point of view of the premium segment, the robust connectivity and acoustic isolation without headphones places it in direct competition with the business class flight on routes within the country. Of course, in the absence of the price. For now, JR Central has only confirmed which will be more expensive than tickets for first-class Shinkansen Green Car seats, which already cost 40% more than a standard unreserved ticket. An example: standard ticket from Tokyo station to Kyoto (2 hours and 15 minutes) costs 13,320 yen and 18,840 yen for the Green Car, that is, 71 and 100 euros respectively. Context. The Tokaido Shinkansen is the busiest high-speed line in the world. Private compartments disappeared from the line in 2003 with the withdrawal of the Series 100 double-decker trains, which included private cabins. This new initiative means the return to the format in style two decades later. Regarding glass antenna technology, the collaboration between AGC, NTT Docomo and Ericsson has been going on since 2018. In fact, in 2019 this conglomerate of companies reached the world’s first 5G communication using an integrated fused silica glass antenna to transmit and receive 28 GHz signals, with average download speeds of 1.3 Gbps and maximum download speeds of 3.8 Gbps in a range of 100 meters. What JR Central is now announcing is the first commercial application in high-speed trains. And in Spain? In connectivity, there is a technological and approach gap. The AVE has Wi-Fi since December 2016 thanks to a system of outdoor 4G-LTE antennas combined with satellite, routers, servers and access points. That is, like what JR Central has just overcome: capturing the signal from outside and redistributing it inside. AGC’s solution for the Shinkansen eliminates this weak point by maintaining direct line of sight with the base stations, something especially critical at high speed. Of course, while PlayRenfe is universal for all travelers, the Shinkansen Wi-Fi will be in the luxury suites. Yes, but. The deployment is very limited: in the initial phase only a couple of suites will be installed in six trains, so coverage is residual against the park of operational units total and JR Central has not made public a roadmap for the expansion of these technologies. On the other hand, NTT’s noise cancellation technology applied to a train poses its own structural challenges, ranging from noise variations at 285 km/h to pressure changes in tunnels. It will be necessary to check the real effectiveness of the system under these conditions. In Xataka | There was a day when Japan was the leading high-speed country. It has been surpassed by China, a victim of its own country In Xataka | In 2015, Japan showed the world a train capable of reaching 600 km/h. Ten years later we still don’t know anything about him Cover | Fikri Rasyid