Method of radio telecommunication and device for implementation

Details Method of radio telecommunication and device for implementation Method of radio telecommunication and device for implementation

1983-05-16

1986-04-01

Atkinson, Charles E.

Excavating

3408255, 370 85, 455 58, H04J 600, H04Q 900

Patent

active

045802661

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a method of radio telecommunication in the simplex mode or alternate duplex mode in which messages are exchanged at irregular instants between central stations and a certain number of secondary stations.
The invention also relates to a device for implementation of this method.
The methods and devices of the type contemplated are more precisely concerned with telecommunications by radiotelephone in the alternate mode and are employed mainly for establishing links between fixed central stations and a certain number of secondary stations located a board vehicles. This is the case, for example, of a network of commercial travelers who have to transmit urgent orders for products, especially fresh products, or a fleet of delivery vehicles which circuit is desired to be checked continuously. But the invention does not in any way exclude fixed secondary stations.
One of the difficulties of links of this type lies in the fact that the transmission channel is not always free, thus obliging the user to repeat his attempts, which results in a regrettable loss of time. The same difficulty arises if a central station which can be a management computer, for example, is temporarily employed for another task.
In order to facilitate the operator's work, devices have been proposed in which the message to be transmitted is stored in a memory, but that does not alter the fundamental problem of availability of the transmission channel.
Furthermore, local conditions of transmission may be poor, thus making the message unusable and obliging the user to repeat his transmission.
The same difficulties evidently affect two-way transmissions.
The object of the present invention is to provide a method and a device for telecommunication which free the user from any tedious need for waiting and repetition.
In the method contemplated by the invention, messages are exchanged at irregular instants between central stations and a certain number of secondary stations by storing in memory the message to be transmitted.
In accordance with the invention, this method is characterized in that availability of the radio channel is tested automatically and continuously and that the message is transmitted automatically when the channel is free.
Once the message has been introduced in memory, the user no longer needs to attend to his transmission. This latter takes place automatically as soon as the channel is subsequently free. As a function of the capacity of the memory, the user can even introduce a certain number of messages which will in some cases be checked on.
In a preferred embodiment of the method, the validity of the message received is checked and transmission of the message is repeated automatically if the reception is not correct.
Neither does the user need to worry about local or atmospheric conditions of transmission or to check the transmission while waiting for an acknowledgement of reception.
Preferably, the message received is stored in memory until the final receiver stage is made available.
For example, if this receiver is a large management computer occupied on a time-sharing basis, no waiting period is imposed.
In an avantageous embodiment of the method, there is added to the message at the instant of transmission a data item representing the time which has elapsed since the instant of introduction of the message.
As a complementary feature, up to the instant of reception by the final receiver stage, the data item representing the time which has elapsed since the instant of introduction of the message is updated.
Although the transmission in fact takes place in deferred time, a reconstitution of the real time is readily obtained.
In an improved embodiment of the method, after having recognized availability of the channel, transmission is retarded by a predetermined time interval corresponding to a transmission-priority hierarchy.
In accordance with a second aspect of the invention, the device for radio telecommunication in simplex mode or alternate duplex mode between central stations and a certai

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