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IEEE/ICACT20210169 Question.4 Questioner: kawano.masahiro959@mail.kyutech.jp 2021-02-09 오후 7:09:20	IEEE/ICACT20210169 Answer.4 Answer by Auhor yfujii@kke.co.jp 2021-02-09 오후 7:09:20
Thank you for your very interesting presentation. My name is Kawano, and I am a student at Kyushu Institute of Technology. I have two questions on page 13 of the slide. In ComRU, it is considered necessary to synchronize the LO of multiple RUs, the transmission start timing, and other clocks. Q1. How do you achieve these synchronizations in your experiments this time? Q2. Do you have any ideas for achieving synchronization when you put this experimental system to practical use? Thank you.	Thank you for your questions, Mr. Kawano. Q1 In this experiment, multiple RUs were synchronized using a common LO. Q2 Synchronizing RUs that are physically located far apart is a particularly challenging task in mmWave, and one of the major research topics for the next research year. Even though it is difficult to achieve permanent synchronization without a common LO, we believe that it is possible to synchronize them for a very short time period by making the best use of 5G UL and DL synchronization signals.

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