Title:
OPTICAL WIRELESS COMMUNICATION SYSTEM, WIRELESS TRANSMISSION/RECEPTION DEVICE, AND OPTICAL WIRELESS COMMUNICATION METHOD
Document Type and Number:
WIPO Patent Application WO/2020/129791
Kind Code:
A1
Abstract:
According to the present invention, a wireless transmitter/receiver generates first signals for reporting timing of time slots allocated to respective radio station devices. A conversion unit converts the first signals into optical signals. A plurality of antenna units convert the first signals from the optical signals into electric signals and wirelessly transmit the first signals. The ratio station devices transmit second signals at the timing reported using the first signals. The plurality of antenna units convert, into optical signals, the second signals wirelessly received from the respective radio station devices. The conversion unit converts the second signals from the optical signals into electric signals. The wireless transmitter/receiver calculates, for each of the radio station devices, transmission delay using a difference between the receipt time of a second signal and the receipt time of a signal transmitted at timing allocated to the radio station device when it is assumed that there is no transmission delay. On the basis of the transmission delay at each of the radio station devices, the wireless transmitter/receiver determines guard time between the time slots allocated to the radio station devices.
Inventors:
OTSUKI NOBUAKI (JP)
SUGA MIZUKI (JP)
ITO KOTA (JP)
KITA NAOKI (JP)
SUGA MIZUKI (JP)
ITO KOTA (JP)
KITA NAOKI (JP)
Application Number:
PCT/JP2019/048622
Publication Date:
June 25, 2020
Filing Date:
December 12, 2019
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
H04J3/00; H04B10/2575; H04B10/272; H04W16/26
Foreign References:
| US20180076914A1 | 2018-03-15 | |||
| JP2004502390A | 2004-01-22 |
Other References:
UZAWA, HIROYUKI ET AL.: "Practical mobile-DBA scheme considering data arrival period for 5G mobile fronthaul with TDM-PON", EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC, 2017, XP033336204, ISBN: 978-1-5386-5624-2
Attorney, Agent or Firm:
SHIGA INTERNATIONAL PATENT OFFICE (JP)
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