Transmission system and coding communication method for a transmission system

• US 6,639,520 B2
• Filed: 12/21/2001
• Issued: 10/28/2003
• Est. Priority Date: 07/25/1996
• Status: Expired due to Fees

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Yoshida, Takashi, Nomura, Noboru, Kane, Joji
• Primary Examiner(s): SWARTHOUT, BRENT
• Application Number:
  US10/037,968
• Publication Number:
  US 20020121990A1
• Time in Patent Office: 676 Days
• Field of Search: 340/905, 340/928, 340/933, 340/932, 340/435, 340/903, 340/994, 455/517, 701/117, 235/384
• US Class Current: 340/905
• CPC Class Codes: G01S 1/68 Marker, boundary, call-sign, or like beacons transmitting signals not carrying directional information
• CPC Class Codes: G01S 13/74 Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
• CPC Class Codes: G01S 13/825 with exchange of information between interrogator and responder
• CPC Class Codes: G08G 1/096725 where the received information generates an automatic action on the vehicle control
• CPC Class Codes: G08G 1/09675 where a selection from the received information takes place in the vehicle
• CPC Class Codes: G08G 1/096775 where the origin of the information is a central station

Abstract

The conventional combination cannot realize an efficient road traffic system as a whole. A transmission system has a plurality of modules installed at different positions along a predetermined road. Each of the plurality of the modules includes a receiving section for receiving an input signal and a transmission section for transmitting an output signal on the basis of the input signal according to a predetermined radio scheme. Each of the plurality of the modules receives and transmits a signal, whereby the whole or part of the information contained in the signal is transmitted along the whole or part of the predetermined road. This transmission system can construct an efficient integrated road traffic system as a whole.

Claims

1. A transmission system far use along a predetermined route comprising:

a plurality of modules installed at different positions along the predetermined route, each of the plurality of modules including;

i) receiving means of receiving an input signal having a radio carrier frequency containing information, and

ii) transmission means of transmitting an output signal based on said input signal;

said output signal of a respective module including a first transmission signal which is transmitted to a first adjacent module on one side of the respective module, and a second transmission signal which is transmitted to a second adjacent module on another side of the respective module,

the first and second transmission signals of the respective module both having the same radio carrier frequency, and both having a radio carrier frequency different from a radio carrier frequency of said input signal, thereby to reduce interference among the plurality of modules; and

said output signal from each of the plurality of modules including at least a portion of the information contained in said input signal, and said output signal transmitted along at least a portion of said predetermined route;

wherein the respective module is at a single location along the predetermined route and receives from/transmits to a mobile unit from the single location, and

the mobile unit communicates with only one respective module at one time.

2. The transmission system of claim 1 wherein said input signal of the respective module includes a first reception signal, which is received from the first adjacent module, and a second reception signal, which is received from the second adjacent module, and

the first reception signal having a radio carrier frequency different from the radio carrier frequency of the first transmission signal and the second reception signal having a radio carrier frequency different from the radio carrier frequency of the second transmission signal.

3. A transmission system for use along a predetermined route comprising;

a plurality of modules installed at different positions along the predetermined route, each of the plurality of modules including;

a receiver and a transmitter for communications between (a) a respective module and a first adjacent module on one side of the respective module, and (b) the respective module and a second adjacent module on another side of the respective module;

the respective module receiving a radio carrier frequency, f1, from the first adjacent module and transmitting a radio carrier frequency, f2, to the first adjacent module; and

the respective module receiving a radio carrier frequency, f3, from the second adjacent module and transmitting a radio carrier frequency, f2, to the second adjacent module;

wherein the frequency f2 transmitted to the first adjacent module and the frequency f2 transmitted to the second adjacent module are the same, and the frequencies f1, f2 and f3 are different from each other;

wherein the respective module is at a single location along the predetermined route and receives from/transmits to a mobile unit trom the single location, and

the mobile unit communicates with only one respective module at one time.