Wireless communication network system synchronization method
First Claim
1. A synchronization method for a wireless communication network system, the wireless communication network system comprising:
- mobile radio sets that are installed on front and rear parts of a mobile body moving along a predetermined route in a manner to be communicable with each other; and
a plurality of fixed radio sets spatially separated and installed along the predetermined 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 plurality of fixed radio sets are time-synchronized in a communicable manner to perform communication, the synchronization method for the wireless communication network system comprising;
sequentially relaying and transmitting a synchronization information by the plurality of fixed radio sets; and
relaying the synchronization information between fixed radio sets by the mobile radio sets installed on the front and rear parts of the mobile body when the mobile body exists between the fixed radio sets, wherein;
at least one of the plurality of fixed radio sets is set as a base station for transmitting a synchronization packet as the synchronization information, and other fixed radio sets and the mobile radio sets are set as relay stations for relaying the synchronization packet transmitted from the base station, andthe other fixed radio sets do not adopt a synchronization packet relayed with intervention of the mobile radio sets while a synchronization packet relayed without intervention of the mobile radio sets is being received and adopted periodically.
1 Assignment
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Accused Products
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.
9 Citations
16 Claims
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1. A synchronization method for a wireless communication network system, the wireless communication network system comprising:
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mobile radio sets that are installed on front and rear parts of a mobile body moving along a predetermined route in a manner to be communicable with each other; and a plurality of fixed radio sets spatially separated and installed along the predetermined 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 plurality of fixed radio sets are time-synchronized in a communicable manner to perform communication, the synchronization method for the wireless communication network system comprising; sequentially relaying and transmitting a synchronization information by the plurality of fixed radio sets; and relaying the synchronization information between fixed radio sets by the mobile radio sets installed on the front and rear parts of the mobile body when the mobile body exists between the fixed radio sets, wherein; at least one of the plurality of fixed radio sets is set as a base station for transmitting a synchronization packet as the synchronization information, and other fixed radio sets and the mobile radio sets are set as relay stations for relaying the synchronization packet transmitted from the base station, and the other fixed radio sets do not adopt a synchronization packet relayed with intervention of the mobile radio sets while a synchronization packet relayed without intervention of the mobile radio sets is being received and adopted periodically. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A synchronization method for a wireless communication network system, the wireless communication network system comprising:
mobile radio sets that are mounted on a mobile body moving along a predetermined route, and a plurality of fixed radio sets spatially separated and installed along the predetermined 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 the synchronization method for the wireless communication network system comprising; sequentially relaying and transmitting synchronization information by the plurality of fixed radio sets, wherein; at least one of the plurality of fixed radio sets is set as a base station for transmitting a synchronization packet as synchronization information, and other fixed radio sets are set as relay stations for relaying the synchronization packet transmitted from the base station, each of the relay stations makes a transition to a synchronization acquiring mode that is a state of waiting for reception of a synchronization packet in response to application of power, a relay station that made the transition to the synchronization acquiring mode makes a transition to a synchronization maintaining mode when receiving a synchronization packet, so that the relay station can transmit the synchronization packet during a preset own synchronization packet transmission allocation period, and the relay station in the synchronization maintaining mode makes a transition to the synchronization acquiring mode when a state without reception of any synchronization packet exceeds a preset limited time of synchronization information update. - View Dependent Claims (11, 12, 13, 14, 15, 16)
Specification