EP0240051A1
Expired / Lapsed
EP
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Radio communication system provided with beacon transmitters
Assignee: Koninklijke PTT Nederland NV
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Filing: 1987-03-06
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Granted: —
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Expires: 2007-03-06
Abstract
Abstract Radio communication system for speech or data communications between a mobile transceiver (3) disposed in a means of transport (1) and fixed transceivers (4) located along the road (2) on which the means of transport moves and connected to the control centres (5, 7) beloning to the several road sections (A, B). A beacon transmitter (8) transmitting a signal with parameters in an encoded form is disposed at a point where the one road section ends and the next one begins. The parameters can relate to channel frequencies and addressing and identification codes applicable to the road section entered by the means of transport. In the mobile transceiver the beacon transmitter signal is encoded and the mobile transceiver set in conformity with the received parameters. For the sake of the possibility that the means of transport can pass along the beacon transmitter in two opposite directions, the parameters of both the one and the other road section at the border of which the beacon transmitter is located, are transmitted. When passing along the beacon transmitter, the mobile transceiver compares all the received parameters with those to which it is set at that moment and after that it changes its setting in conformity with the parameters deviating from the actual setting. In addition to the setting parameters the beacon transmitter can also transmit complementary system data, such as a beacon transmitter identification code and a beacon transmitter condition parameter, which complementary system data can be transmitted to the fixed transceivers and to the associated control centre via the mobile transceiver.
Inventors
- 👤 Johannes Victorius Elsendoorn
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 05:26
CPC Classifications
B; B61; B61L; B61L27/00; B61L27/70; B61L3/00; B61L3/02; B61L3/08; B61L3/12; B61L3/125; G; G08; G08G; G08G1/00; G08G1/123; H; H04; H04W; H04W84/00; H04W84/005
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
214 words
Radio communication system for establishing and maintaining radio speech or data communications between on the one hand a mobile transceiver disposed in a means of transport which follows an, at least partly, predetermined road, and on the other hand fixed transceivers, located along road sections forming the pre- determined road, which fixed transceivers are in communication with a control centre belonging to a road section, which mobile transceiver comprises receiving means and processing means for receiving respectively processing system signals, a fixed beacon transmitter being disposed near a point where a first road section ends and a next one begins, which beacon transmitter transmits a system control signal, and the processing means setting the mobile transceiver on reception of the system control signal received via the receiving means during the time when the beacon transmitter was passed along, characterized in that the system control signal transmitted by the beacon transmitter (8) comprises parameters in an encoded form for the sake of the establishment and maintenance of communications between the mobile transceiver (3) and the fixed transceivers (6) and their associated control centre (7) within the next road section (B), and in that said processing means (13) set the mobile transceiver (3) in conformity with the received parameters on reception of the system control signal.
Claim 2
Dependent Claim
214 words
Radio communication system for establishing and maintaining radio speech or data communications between on the one hand a mobile transceiver disposed in a means of transport which follows an, at least partly, predetermined road, and on the other hand fixed transceivers, located along road sections forming the pre- determined road, which fixed transceivers are in communication with a control centre belonging to a road section, which mobile transceiver comprises receiving means and processing means for receiving respectively processing system signals, a fixed beacon transmitter being disposed near a point where a first road section ends and a next one begins, which beacon transmitter transmits a system control signal, and the processing means setting the mobile transceiver on reception of the system control signal received via the receiving means during the time when the beacon transmitter was passed along, characterized in that the system control signal transmitted by the beacon transmitter (8) comprises parameters in an encoded form for the sake of the establishment and maintenance of communications between the mobile transceiver (3) and the fixed transceivers (6) and their associated control centre (7) within the next road section (B), and in that said processing means (13) set the mobile transceiver (3) in conformity with the received parameters on reception of the system control signal.
Claim 3
Dependent Claim
103 words
Radio communication system in accordance with claim 1, characterized in that the system control signal transmitted by the beacon transmitter (8) moreover comprises parameters, in an encoded form, for the sake of the establishment and maintenance of communications between the mobile transceiver (3) and the fixed transceivers (4) and their associated control centre(5) within the first road section (A), said processing means (13) comparing the received parameters, on reception of the system control signal, with the parameters set at that moment in the mobile transceiver (3), and setting the mobile transceiver (3) in conformity with the parameters deviating from the actually set parameters.
Claim 4
Dependent Claim
37 words
Radio communication system in accordance with claim 1 or 2, characterized in that at least part of the parameters relates to the channel frequencies of the fixed transceivers (4 respectively 6) and of the mobile transceiver (3).
Claim 5
Dependent Claim
44 words
Radio communication system in accordance with claim 1 or 2, characterized in that at least part of the parameters relates to addressing and/or identification codes to be transmitted along with message signals between the mobile transceiver (3) and the fixed transceivers (4 respectively 6).
Claim 6
Dependent Claim
36 words
Radio communication system in accordance with claim 1, characterized in that the system control signal transmitted by the beacon transmitter (8) forms part of a system signal which further comprises complementary data in an encoded form.
Claim 7
Dependent Claim
59 words
Radio communication system in accordance with claim 5, characterized in that the complementary system data or at least part of them are conditionally or unconditionally transmitted, either in a modified or in an unmodified form, to the control centre (5 respectively 7) by the processing means (13) via the mobile transceiver (3) and the fixed transceivers (4 respectively 6).
Claim 8
Dependent Claim
24 words
Radio communication system in accordance with claim 6, characterized in that the complementary system data comprise an identification code of the beacon transmitter (8).
Claim 9
Dependent Claim
37 words
Radio communication system in accordance with claim 7, characterized in that the mobile transceiver (3) transmits the identification code of the beacon transmitter (8) with the addition of an identification code of the means of transport (1).
Claim 10
Dependent Claim
32 words
Radio communication system in accordance with claim 6 or 7, characterized in that the complementary system data comprise one or more condition parameters concerning the condition of the beacon transmitter (8) itself.
Claim 11
Dependent Claim
30 words
Radio communication system in accordance with claim 9, characterized in that the processing means (13) transmit the condition parameters to the control centre (5 respectively 7) dependent on their value.
Claim 12
Dependent Claim
62 words
Radio communication system in accordance with claim 9, characterized in that the beacon transmitter (8) comprises a first transmitter (20) and a second transmitter (21), the first transmitter transmitting a code signal comprising first condition parameters concerning the condition of the second transmitter, and the second transmitter transmitting a code signal comprising second condition parameters concerning the condition of the first transmitter.
Claim 13
Dependent Claim
74 words
Radio communication system in accordance with claim 10, characterized in that the beacon transmitter (8) comprises a first transmitter (20) and a second transmitter (21), which transmit by turns, the mobile transceiver (3) transmitting an alarm signal in the case of an insufficient signal strength of one of the two transmitters, which alarm signal is transmitted to the associated control centre (5, 7) by means of reception by the relevant fixed transceivers (4, 6).
Claim 14
Dependent Claim
115 words
Radio communication system in accordance with claim 1, the fixed transceivers and the beacon transmitter transmitting at different channel frequencies, and the mobile transceiver comprising scanning and selecting means for scanning receive channels and selecting and switching through the channel with the greatest signal strength, characterized in that said scanning and selecting means scan the channels used by the transmitters of the fixed transceivers (4 respectively 6) within the relevant road section (A respectively B) as well as the channels to be used by the beacon transmitter (8), said scanning and selecting means transmitting the beacon transmitter signal to the processing means (13) of the mobile transceiver (3) after selection of a beacon transmitter channel.
References Cited (Backward Citations)
GB1355803A
Cited
DE2222110A1
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DE2143474A1
Cited
FR2207279A2
Cited
DE2644206A1
Cited
NL8005861A
Cited
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