Communications: electrical – Traffic control indicator – Combined
Patent
1994-03-22
1995-06-13
Crosland, Donnie L.
Communications: electrical
Traffic control indicator
Combined
340933, 340937, 34082554, 342 42, 342456, 235384, 364436, G08G 100
Patent
active
054247276
ABSTRACT:
A two-way packet radio-based electronic toll collection system is to be installed on a highway and includes a main communication tower for transmitting continuously downlink communication packets that contain information regarding available uplink communication channels, and an in-vehicle unit installed in each vehicle passing along the highway to receive the downlink communication packets. The in-vehicle unit is capable of selecting one of the available uplink communication channels. The in-vehicle unit and the main communication tower exchange toll collecting and payment information wirelessly via the available uplink communication channel selected by the in-vehicle unit and a downlink communication channel corresponding thereto. When collision occurs along the packets transmitted by a number of in-vehicle units, a retransmission scheme is applied for each in-vehicle unit to guarantee successful communication between the tower and the in-vehicle unit.
REFERENCES:
patent: 5101200 (1992-03-01), Swett
patent: 5289183 (1994-02-01), Hassett et al.
patent: 5307349 (1994-04-01), Shloss et al.
patent: 5351052 (1994-09-01), D'Hont et al.
Best Network Systems, Inc.
Crosland Donnie L.
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