Title:
サーバ、通信端末装置、移動体、ＩｏＴ機器、通信システム、情報を提供する方法及びプログラム
Document Type and Number:
Japanese Patent JP6900446
Kind Code:
B2
Abstract:
To inhibit interference of radio frames even when time reference signal sources to be used for synchronization setting for transmission/reception times of the radio frames are different among a plurality of communication terminals communicating via radio with each other by using a direct radio communication scheme between short range devices.SOLUTION: A communication terminal is capable of using a first synchronization scheme in which a transmission/reception time of a radio frame is determined and set according to a time reference of communication via a base station in a mobile communication network and a second synchronization scheme in which a transmission/reception time of a radio frame is determined and set according to a time reference obtained by a GNSS receiver. The method comprises: receiving, from the communication terminal, information of a time difference between a transmission/reception time of a radio frame when the first synchronization scheme is selected and a transmission/reception time of the radio frame when the second synchronization scheme is selected; storing the information of the time difference and cell identification information associating both; and transmitting, to a communication terminal communicating via a direct radio communication scheme, information of a time difference corresponding to a cell serving the communication terminal.SELECTED DRAWING: Figure 1
Inventors:
Kenichi Ebisawa
Keisuke Asakura
Hiroaki Kawamura
Nao Ogura
Jun Kasami
Hiroshi Otake
Tomoro Watanabe
Keisuke Asakura
Hiroaki Kawamura
Nao Ogura
Jun Kasami
Hiroshi Otake
Tomoro Watanabe
Application Number:
JP2019190410A
Publication Date:
July 07, 2021
Filing Date:
October 17, 2019
Export Citation:
Assignee:
Softbank Corp.
International Classes:
H04W56/00; H04L7/00; H04W4/40; H04W4/70; H04W8/02
Domestic Patent References:
| JP2013500640A | ||||
| JP2019029716A | ||||
| JP2017092652A | ||||
| JP2018026625A |
Foreign References:
| WO2019030935A1 | ||||
| US20190116571 | ||||
| US20190289561 |
Attorney, Agent or Firm:
Toshi Kuroda
Nakamura Hiromichi
Nakamura Hiromichi