Title:
無線通信ネットワークシステムの同期方法
Document Type and Number:
Japanese Patent JP5922902
Kind Code:
B2
Abstract:
Mobile radio sets are installed on front and rear parts of a mobile body, one of fixed radio sets is set as a synchronization base station, and the other radio sets including the mobile radio sets are set as synchronization packet relay stations. Each of the relay stations in a synchronization acquiring mode makes a transition to a ground synchronization maintaining mode higher in synchronization accuracy when receiving a synchronization packet without the intervention of the mobile radio sets, or makes a transition to an on-vehicle synchronization maintaining mode lower in synchronization accuracy when receiving a synchronization packet with the intervention of the mobile radio sets, and the relay station in the on-vehicle synchronization maintaining mode makes a transition to the ground synchronization maintaining mode when receiving a synchronization packet from a relay station in the ground synchronization maintaining mode.
Inventors:
Yamaguchi Eiji
Hiromi Saito
Otsuka Yuhei
Toshito Shirai
Hiromi Saito
Otsuka Yuhei
Toshito Shirai
Application Number:
JP2011218180A
Publication Date:
May 24, 2016
Filing Date:
September 30, 2011
Export Citation:
Assignee:
Nippon Signal Co., Ltd.
International Classes:
H04W56/00; H04W4/04
Domestic Patent References:
| JP2000102063A | ||||
| JP2008062874A | ||||
| JP2009225135A | ||||
| JP2010171509A | ||||
| JP2009194855A |
Foreign References:
| WO2005081558A1 |
Attorney, Agent or Firm:
Moriaki Ogawa
Haruyuki Nishiyama
Shoichi Okuyama
Tomijio Sasashima
Haruyuki Nishiyama
Shoichi Okuyama
Tomijio Sasashima