WIRELESS COMMUNICATION NETWORK SYSTEM SYNCHRONIZATION METHOD

摘要

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.

主权项

1. A synchronization method for a wireless communication network system provided with mobile radio sets that are mounted on a mobile body moving along a predetermined route, and a plurality of fixed radio sets that is spatially separated and installed along the route in such a manner that adjacent fixed radio sets perform wireless communication with each other to transmit information while relaying the information from a transmission source to a terminal fixed radio set, wherein the mobile radio sets and the fixed radio sets are time-synchronized in a communicable manner to perform communication,
wherein the mobile radio sets are installed on front and rear parts of the mobile body in a manner to be communicable with each other, and when the mobile body exists between fixed radio sets, synchronization information between the fixed radio sets can be relayed by the two mobile radio sets mounted on the mobile body.