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15th April 201924th URSI-C Chair
Makoto Taromaru

Activity Report of URSI-C Committee

Since the 24th committee started, we have held scientific workshops four times as thefollowings.

- The 1st scientific workshop of the 24th URSI-C in Japan-1. Session title: “Wireless Access TechnologiesTowards the 5th Generation Mobile
Communication”
2. Convener: Prof. Satoshi Denno (Okayama University)
3. Date/time: 14:00 - 17:00, June 29th, 2018
4. Venue: 16th Building, Yagami Campus (Yokohama city, Kanagawa pref.)5. Registration fee: Free
6. Listed attendees: 28 persons
7. Local arrangement: Prof. Yukitoshi Sanada (Keio University)
8. Presentations: 14:00 - 14:10 Opening Remarks
Prof. Makoto Taromaru, Chair, Commission C of URSI-JNC (Fukuoka Univ.) 14:10 - 14:50 "Docomo's 5G Trial for 5G Realization"
Dr. Satoshi Suyama (NTT Docomo）
 14:50 - 15:30 "Advancement of Non-Linear Precoding Technology for Multi-User
MIMO Systems"
Dr. Manabu Mikami (Softbank) 15:30 - 15:40 Coffee Break (10 min.) 15:40 - 16:20 "Indoor and Outdoor Field Experimental Results of Low-SHF-Band
Multi-UserC-RAN Massive MIMO Systems for 5G"
Mr. Kenichiro Yamazaki (NEC), et al.
 16:20 - 17:00 "Standardization activities for high speed train scenarios in 3GPP 5G
NR"Dr. Fumihiro Hasegawa (Mitsubishi Electric), et al.
 17:00 Closing
9. Reception: held from 17:30 to 19:30 at Yagami faculty lounge, Yagami Campus
Keio University, Yokohama. The number of attendees was 14 persons.
10. The Steering committee meeting took place from 11:30 to 12:00 on June 29th, 2018.

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11. Concluding Remarks
There are 5 requirements for the 5th generation mobile communication (5G) such as"Massive connection", "Low cost and low power consumption", "Low latency", "Hightransmission speed", "High capacity". We listened to the talk mainly on research anddevelopment for the latter three requirements.
The convener has used mobile phones since the second generation systems waslaunched and it is felt that the LTE is enough high from the viewpoint of transmission
speed. Actually, the presentation by the researcher of NTT Docomo impressed me that
more high speed and low latency wireless networks are truly needed in some businessscenes. In addition, such high speed wireless networks are made possible by someemerging technologies such as precoding that have been investigated intensively. The 5G
testbed based on such emerging technologies and the measurement campaign results withthe testbed make me feel sure that the 5G will be really commercialized in 2020. The 5G
network will be spreading over the world, for instance, receivers on high speed trains,which is very impressive.

資料6-C- The 2nd scientific workshop of the 24th URSI-C in Japan 1.
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Session title: "OAM radio transmission technologies"
Convener: Yasunori Suzuki (NTT DOCOMO, INC.)
Date/time: 14:00 - 17:00, October 12th, 2018
Venue: Setsunan University, Neyagawa-shi, Osaka Pref.
Registration fee: Free
Listed attendees: 22 persons
Local arrangement: Prof. Shoichi Narahashi (Setsunan University)
Presentations:
14:10 - 14:20 Opening Remarks
Prof. Makoto Taromaru, Chair, Commission C of URSI-JNC (Fukuoka University) 14:20 - 15:10 "Analog OAM Multiplexing and Related Technologies"
Prof. Atsushi Sanada (Osaka University) 15:10 - 16:00 "Development of Millimeter-wave OAM Mode Multiplexing System
for High Capacity Backhaul"
Mr. Eisaku Sasaki (NEC) 16:00 - 16:10 Coffee Break 16:10 - 17:00 "An experiment of 100 Gbps wireless transmission using OAMMIMO multiplexing technology using 28 GHz frequency band"
Dr. Doohwan Lee (NTT Network Innovation Laboratories) 17:00Closing
9. Reception:
It held from 17:30 to 19:30 at Kogannko restaurant in Neyagawa-shi, Osaka pref.
The number of attendees was 14 persons.
10. The steering committee meeting:
It took place from 13:00 to 13:30 on October 12th, 2018, at Setsunan University.
11. Concluding Remarks
OAM (Orbital Angular Momentum) method is expected to be applicable for new
radio transmission technology for beyond fifth-generation mobile communications
system. This workshop was aimed to present and discuss OAM radio transmission
technologies by the presenters. We deeply discussed on wide aspects of thetechnological subjects, bottlenecks, solutions and practical timelines in relation to thepresentations given by three renowned leading researchers and questions, anddeepened common understanding of future prospects.

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Prof. Atushi Sanada (Osaka University) presented the analog OAM radiotransmission technology which includes the experimental result of the radiotransmission in the center frequency of 10 GHz and the bandwidth of 2 GHz. He alsopresented the principle of the analog OAM radio transmission technology.
Mr. Eisaku Sasaki (NEC) presented the development of millimeter-wave OAM
mode multiplexing system. He provided the experimental results of the development
system in 5GHz and E bands, while he also presented the technical solution for
degrading the performance of the development system.
Dr. Doohwam Lee (NTT Network Innovation Laboratories) presented theexperimental results of 100 Gbps radio transmission technology which employ theOAM-MIMO multiplexing technology at 28 GHz band.
This workshop had a great merit for contributing to the research and developmentof the OAM radio transmission technology on the future ultrahigh-speed wirelesscommunications towards beyond 6G on the way via post 5G followed by the next
generation 6G. This workshop gave us very useful opportunity to understand the stateof-the-art research and development situation and to share common recognitions
about technical issues and future outlooks against the independent future image ofeach participant envisioned. Convener: Prof. Satoshi Nishimori, Niigata University資料6-C- The 3rd scientific workshop of the 24th URSI-C in Japan 1. Session title: "Millimeter / Terahertz Wave Devices and Circuits their Applications
for Ultra-High Speed Wireless Communication Systems"
2. Convener: Prof. Taiichi Otsuji (Tohoku University)
3. Date/time: 13:30 - 17:20, December 14th, 2018
4. Venue: Room "Hourai", Hotel Ryokusui-Tei in Akiu-Onsen (Sendai, Miyagi pref.)5. Registration fee: Free
6. Listed attendees: 18 persons
7. Local arrangement: Prof. Taiichi Otsuji (Tohoku University)
8. Presentations: 13:30 - 13:40 Opening Remarks
Prof. Makoto Taromaru, Chair, Commission C of URSI-JNC (Fukuoka University) 13:40 - 14:30 "Advances in terahertz wireless communication technology utilizing
resonant-tunneling diodes"
Prof. Safumi Suzuki (Tokyo Institute of Technology), et al.
 14:30 - 15:20 "Cutting-edge LSI technology for 300-GHz band ultra-high speed
wireless communications"
Prof. Minoru Fujishima, member of the URSI-JNC-C (Hiroshima University) 15:20 - 15:40 Coffee Break (10 min.) 15:40 - 16:30 "Advances in Ga2O3 power devices"Dr. Masataka Higashiwaki (NICT), et al.
 16:30 - 17:20 "Advances in terahertz lasers and amplifiers utilizing graphene as again medium"
Prof. Taiichi Otsuji, member of the URSI-JNC-C (Tohoku University) 17:20
Closing
9. Reception:
It held from 18:30 to 20:30 at Room Rindou, Hotel Ryokusui-Tei in Akiu-Onsen,
Senda city, Miyagi pref. The number of attendees was 13 persons.
10. The Steering committee meeting:
It took place from 8:30 to 9:15 on December 15th, 2018, at Room 713, Hotel
Ryokusui-Tei in Akiu-Onsen.
11. Concluding Remarks
Terahertz electromagnetic waves, situated in between radio waves and light waves,are expected to be applicable in various industrial applications. In particular, research資料6-Cand development are accelerating in recent years as a frequency resource
indispensable for realizing ultrahigh-speed wireless communication systems.
This workshop was aimed to present and discuss cutting-edge millimeter- andterahertz-wave devices/circuits technologies and their applications to ultrahigh-speed
wireless communication systems by researchers who are active at the forefront of awide range of materials, devices, circuits, and systems research and development,
attracting 18 participants. We deeply discussed on wide aspects of the technologicalsubjects, bottlenecks, solutions and practical timelines in relation to the presentations
given by four renowned leading researchers and questions, and deepened common
understanding of future prospects.
Dr. Safumi Suzuki (Tokyo Inst. of Tech.) presented the experimental works for
300-GHz band 20-Gbit/s class sub-terahertz wave radio transmission experimentusing resonant tunnel diodes as sub-terahertz oscillator/detector devices andaddressed the prospect for 100-Gbit/s class wireless communications.
Dr. Minoru Fujishima (Hiroshima Univ.) reported on advanced technology andfuture prospect of a front-end transceiver circuit for 300-GHz band radio
communication by using complete silicon CMOS IC technology.
Dr. Masataka Higashiwaki (NICT) presented advances in Ga2O3 power devices
including the presenter's pioneering crystal growth technology of Ga2O3 as a nextgeneration high-power high-speed transistor material and the current status and future
prospect of application of Ga2O3 to the transistor devices.
Dr. Taiichi Otsuji (Tohoku Univ.) reported the discovery and development statusof a new terahertz laser/amplifier devices using graphene, a carbon-atomic monolayermaterial, as a gain medium. In response to these state-of-the-art research anddevelopment works leading the world, the attendees stimulated discussions deeply on
issues to be coped with, benchmarking with existing/alternative technologies, as well
as future prospect.
Now ITU-T is working in active to extend the frequency allocation beyond thepresent upper limit at 275 GHz up to 3000 GHz, being scheduled for the next fiscal
year. In this situation, This workshop had a great merit for contributing to thematerialization of the technology roadmap on the future ultrahigh-speed wirelesscommunications towards beyond 6G on the way via post 5G followed by the next
generation 6G. This workshop gave us very useful opportunity to understand the stateof-the-art research and development situation and to share common recognitions
about technical issues and future outlooks against the independent future image ofeach participant envisioned.Session title: "OAM radio transmission technologies"資料6-C資料6-C- The 4th scientific workshop of the 24th URSI-C in Japan 1. Session title: "Wireless Access Technologies Beyond the 5th Generation MobileCommunications"
2. Convener: Prof. Satoshi Denno, Okayama University.
3. Date/time: 13:20 - 17:30, March 1st, 2019
4. Venue: Room "the meeting room in the KKR Kinosaki-Genbu", Kinosaki-cho,Toyooka, Hyogo
5. Registration fee: Free
6. Listed attendees: 19 persons
7. Local arrangement: Prof. Hidekazu Murata, Kyoto University.
8. Presentations: 13:20 - 13:30 Opening Remarks
Prof. Makoto Taromaru, Chair, Commission C of URSI-JNC (Fukuoka University) 13:30 - 14:15 "IoT standardization activity in 3GPP"
Mr. Satoshi Nagata (NTT DOCOMO, Inc. ) 14:15 - 15:00 "NICT's R&D toward the 5G Era and Experimental Demonstration
for Massive MTC"
Dr. Kentaro Ishizu (NICT) 15:00 - 15:45 "5G URLLC field trials as an application to truck platooning"
Dr. Hitoshi Yoshino (Softbank Corp. ) 15:45 - 16:00 Coffee Break (15 min.) 16:00 - 16:45 "Cellular V2X Evolution for Autonomous Driving Era"
Mr. Shinpei Yasukawa (NTT DOCOMO, Inc.) 16:45 - 17:30 "Edge Computing for connected cars"
Mr. Takeshi Kitahara (KDDI Research, Inc.) 17:30 Closing
9. Reception:
Held from 18:30 to 20:30 at the restaurant in the Kinosaki-Genbu. The number ofattendees is 17 persons.
10. The night session:
21:00～17:30 "On recent receiver system architecture of USRP: The SDR platforms
becoming analog-rich"Prof. Makoto Taromaru (Fukuoka University)資料6-C

11. The Steering committee meeting took place at the meeting room in the KKR
Kinosaki-Genbu, from 8:30 to 9:30 on March 2nd, 2019.
12. Concluding Remarks
There are 5 requirements for the 5th generation mobile communication (5G) suchas "Massive connection", "Low cost and low power consumption", "Low latency","High transmission speed", "High capacity". Because we discussed the latter 2 issues
at the URSI-C technical meeting held on June 29th, 2018, we had a meeting to discuss
about the former three issues, and the technical trend and perspective of the beyond
5th generation cellular communication systems.
The five researchers working on such issues were invited to talk about cutting edge
technologies and standardization activities for the IoT network with the 5th generation
cellular systems and the beyond 5th generation cellular systems.
Although business models of the IoT have not been established well, wirelessassisted car driving, one of the applications of the IoT, was introduced as one of thevery promising applications.
The techniques to implement the wireless assisted car driving have been discussed
in the third Generation Partnership Project (3GPP) where standardization of the 5th
generation cellular system is discussed, and the 5G Automotive Association (5GAA)
where the requirement for the wireless car driving is discussed. Although there arestill some important issues left, definitely those techniques are interesting.