NTT DoCoMo achieves 28GHz wireless data transmission in ultrahigh mobility environment

NTT DoCoMo says it has achieved what is believed to be the world’s first successful 28 GHz wireless data transmission between a 5G base station and a 5G mobile station in 5G field trials using a car moving at 305 KMH or about 189 MPH. The trials were conducted last month at the Japan Automobile Research Institute (JARI) using 700 megahertz of spectrum. They also included live wireless relay of 4K high-frame rate video via uplink from a 5G mobile station moving at 200 km/h, according to DoCoMo.

The speeds in the field trials are designed to be similar to speeds of high-speed railways, so it’s understandable the operator wants to make sure it works, including handoffs, at these kinds of speeds.

Working with NEC and Nippon Telegraph and Telephone Corporation (NTT), DoCoMo said the trials also achieved what are believed to be the world’s first successful 1.1 Gbps ultrahigh-speed data transmission via downlink to a 5G mobile station moving at 293 km/h. It also conducted a fast handover during communication between 5G base stations and a 5G mobile station moving at 290 KMH.

DoCoMo noted that the “world’s first” achievements are according to DoCoMo research as of April 23, 2018. Japan’s largest wireless network operator and its partners used beamforming and beam tracking to address propagation challenges in the 28 GHz band. The 5G base stations used massive-element antenna (96 elements, up to two beams), and the mobile station had massive-element antenna (64 elements, up to two beams). Sony Business Solutions provided a 4K camera for high-frame rate video, and DoCoMo’s own Dandelion racing manager provided a trial car and operated the car on the test course.

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DoCoMo’s 5G R&D objectives and “Phantom Cell” architecture:

NTT DOCOMO’s 5G related research and development will enable a wide range of capabilities such as super high data rate communications of over 10Gbps, lower latency, and simultaneous connection of a large number of terminals in order to support the future spread of M2M communications and internet of things (IoT), etc.

DOCOMO is advocating the concept of Phantom Cell architecture, which consists of a combination of a small cell using a higher frequency band and broader bandwidth and a macro cell using a conventional lower frequency band. For 5G, DOCOMO is making research and development efforts with a focus on the development of technologies that enable efficient transmission in higher frequency bands such as the beamforming technology leveraging a large array of antenna elements (Massive MIMO) as well as technologies for efficient transmission in lower frequency bands.
Toward the goal of 5G service rollout, various mobile communication technologies and schemes need to be tested, including low-latency transmission methods that meet the needs of M2M and other various applications. To this end, DOCOMO is conducting experimental trials in collaboration with world-leading vendors to confirm the feasibility of a wide range of mobile communication technologies, centering on the concepts that DOCOMO advocates.

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DoCoMo is preparing to show off its 5G technology for the Olympics in 2020.  Intel revealed earlier this year that it is collaborating with DoCoMo to develop 5G applications, like 360-degree 8K-video streams for highly immersive watching of the games.

Sports viewing

Sports viewing: Choosing any of video streams from numerous small cameras in the venue, you can enjoy vivid, powerful images from the players’ viewpoints over an omni-directional three dimensional screen.

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Earlier this year, DoCoMo completed a trial with Huawei and Tobu Railway at Tokyo Skytree Town, the commercial center in the Sumida District of Tokyo that is the home of the iconic 634-meter high television broadcasting tower and landmark. The trial focused on delivering consistent 5G system performance for enhanced mobile broadband (eMBB) applications within the complex, and was used to research radio propagation characteristics and other technical conditions for the 28 GHz band and other candidate spectrum within congested environments.

References:

https://www.nttdocomo.co.jp/english/info/media_center/pr/2018/0509_00.html

https://www.nttdocomo.co.jp/english/corporate/technology/rd/tech/5g/

https://www.nttdocomo.co.jp/english/corporate/technology/rd/tech/5g/5g_trial/index.html

https://www.fiercewireless.com/wireless/japan-s-docomo-claims-5g-first-field-trial-involving-28-ghz-and-ultra-high-mobility

 

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