Transmission base for a radio telephonic communication arrangement.

This invention relates to a transmission base for a radiotelephone communication device.

Radiotelephone communication devices are known which include a plurality of fixedly deployed transmission bases, connected to a telephone network and intended to provide a radio connection with a series of mobile stations, moving within the territory covered by the communication device. radiotelephone · In known devices, a transmission base includes at least one radio signal receiving antenna; a receiving coupling member 16 connected to the receiving antenna; a series of receptor organs attached to the receiving coupling organ; a series of numerical treatment units, each connected to a receiving organ, a line of a telephone network and a management unit; a series of emitting organs, each connected to a numerical treatment unit; an issuing coupling body linked to the issuing bodies; and a transmitting antenna connected to the broadcasting organ.

Moreover, it is known that in order to ensure transmission security between the transmission base and the mobile stations, whatever radio obstacles exist between the emission base and the mobile stations, such as unfavorable terrain configurations or certain constructions. which form a radio station, it is desirable to make a frequency hopping emission, each frequency being affected differently by radio obstacles. In order to be able to make frequency hops with the existing transmission bases, the structure of which was recalled above, it is necessary that the emitting coupling member be a wideband organ, which operates in a hybrid mode. - Such coupling members have the drawback of dragging power losses as a function of the number of stages of the transmission base, It is therefore necessary to provide a very large initial power for transmission bases which must simultaneously transmit a large number of communications.

113

OE-442 cas 2 GF-AG

<img file="PT94343B_D0001.tif" />

To reduce the required power while ensuring frequency hopping, it has been envisaged to regroup the receptor organs and the transmitting organs into common modules, coupled with a coupling operating in a cavity mode. Such a device always requires the construction of an extremely complex switching matrix to ensure the connection between the sending and receiving modules on the one hand and the numerical treatment units on the other.

An object of the present invention is to provide a relatively simple frame transmission base which can easily function in connection with the broadband or cavity type coupling member.

In order to realize this object, it is proposed according to the invention, a transmission base for a radioelectric communication device, said transmission base including at least one radio signal receiving antenna; a receiving coupling member connected to the ant in the receiver; a series of receiving organs connected to the receiving coupling organ; a series of numerical handling units, each connected to a receiving organ, a line of a telephone network and a management unit; a series of emitters connected to the numerical treatment units; an emitting coupling member connected to the emitting members; and an emitting antenna connected to the emitting coupling member; wherein the numerical treatment units are 1.1 connected to the emitting organs by a series of connecting lines, each connecting line being connected to a numerical treatment unit on the one hand and to the parallel connecting emitting organs on the other hand , and in which each sender includes a switching organ that commands the communication of the sender, associated with one of the connecting lines.

According to the embodiment of the invention, in which the emission coupling and the cavity type organ is located. of each emitting organ adapted to transmit a signal at a fixed frequency, each switching organ includes means for detecting transmission messages from one of the units.

OS-442 cas 2 GF-AG

<img file="PT94343B_D0002.tif" />

numerical processing facilities containing data to be transmitted at the frequency of the transmitting organ, to which the switching organ is associated and ensuring the communication of the sending organ, related to the corresponding connection line.

According to an advantageous embodiment of the invention, in which the emission coupling and the cavity type coupling organ and in which the permanent emission is to be ensured with a beacon frequency, the emitter member associated with the beacon frequency ensures an emission. useful each time data to be transmitted at the beacon frequency is displayed on a connecting line, and an insert emission when no data to be transmitted at the beacon frequency is present on one of the connecting lines.

According to an embodiment of the invention, in which the emitting coupling member is of the hybrid type, each switching member assures a permanent connection with one of the connection lines.

According to an advantageous embodiment of the invention in which broadcasts are made at a frequency greater than the number of numerical treatment units, the coupling member in emission is of the hybrid type, and must be ensured a permanent emission at a frequency of the transmission base includes a beacon issuing body, in addition to the issuing bodies associated with the numerical processing units, the beacon emitting member, associated with a switching organ including means for detecting transmission messages from the set of numerical processing units and commanding an insertion emission with the beacon frequency, when none of the other emitting organs emits signal at beacon frequency ·

Other features and advantages of the invention will be emphasized by reading the following description of a preferred, non-limiting embodiment of the invention in connection with the accompanying single figure which schematically depicts the structure of a base. transmission according to the invention ·

113

OE-442 cas 2GF-AG

Referring to the figure, the transmission base according to the Invention includes a radio signal receiving antenna 1; a receiving coupling member 2 attached to the receiving antenna; a series of receiving organs 3 connected to the receiving coupling organ ·

In one embodiment, the number of receiving organs has been limited to three, but this number may, of course, be increased by the number of communications to be transmitted to the base.

Each of the receiving organs 3 is connected to a numerical treatment unit 4, itself associated with a line 5 of a telephone network and a common management unit 6. 0 receiving coupling organ 2 operates in hybrid mode and any of the receiving organs are listening at all times to a radio station whose carrier frequency is communicated to it by the numerical treatment unit to which it is associated as a function of control signals sent by the handling unit, in which the frequency hopping rules were introduced, during the transmission base start-up. at the time of carrying out the amplification and numerical conversion of the received radio signals. While the numerical handling units ensure the decoding of the transmission over the telephone network of received numerical signals which reassemble several telephone communications themselves according to the rules of time multiplexing themselves known.

Moreover, each of the numerical processing units 4 is connected to a line of a series of connecting lines 7, arranged in parallel to send transmission messages to the sending organs 8. Each transmission message includes data to be transmitted, an indication of the frequency at which this data is to be transmitted and, in this case, other information such as the transmitting power. · The sending agencies 8 are each connected to all the lines. according to parallel connections via switchgear 9

115

OE-442 cas 2 GF-AG

-or which are used to control the communication of the associated transmitting organ with one of the connecting lines 7 · The sending organs 8 are connected to a coupling organ 10, which is itself associated with a transmitting antenna 11 ·

In the preferred embodiment of the invention, the emitting coupling member 10 is of the cavity type, that is, each emitter member 8 associated with the coupling member 10 is adapted to transmit a signal with a fixed frequency. In this case, the number of transmitters 8 and the number of fixed frequencies in which it is intended to be emitted.

In particular, although the number of transmitters 8 represented has been limited to four, for the sake of simplicity of figure, this number may be increased or reduced depending on the number of fixed frequencies to be used, the minimum number being always Equal to the number of numerical handling units · Incidentally, handling unit 6 ensures a synchronization of numerical handling units 4, so that at each Instance a single numerical processing unit sends a transmission message containing a given broadcasting frequency. Frequency hops are performed in a stepwise manner by each numerical processing unit according to pre-defined rules. management unit when performing the Installation · In this embodiment, each switching member includes transmission message detection means from the naked handling units. to determine which of the numerical treatment units to be connected to the transmitter 8 to which the switchgear is associated · Each time a switchgear 9 detects which data should be transmitted at the frequency of the switchgear. to which it is associated, the switchgear assures the connection with the corresponding connecting line. data processing and transmits the modulated signal corresponding to the transmitting antenna 11, which then ensures a useful modulated broadcast.

In the event that a permanent emission with a marking frequency is to be ensured, this frequency shall be

113

ΟΕ-442 cas 2 GF-AG

<img file="PT94343B_D0003.tif" />

<img file="PT94343B_D0004.tif" />

As an accessory for mobile stations, even in the absence of data transmission, one of the transmitters 8 is, of course, regulated in the beacon frequency, and this transmitter ensures a useful broadcast whenever a transmission message containing the data, which shall be transmitted at the beacon frequency, is on a connecting line and an insertion emission when none is modulated at all, which must be transmitted at the beacon frequency is present in one of the lines. Connection lines · Depending on a decision made during the elaboration of each provision, the insertion emission and an unmodulated emission, with the beacon frequency or a modulated emission according to the rules specific to the provision ·

Since in the preferred embodiment the drive base according to the invention is used with the cavity-type coupling member to reduce the power required for its operation, the drive base according to the invention , can easily be adapted for operation with a hybrid emission coupling member 10 · In this case, each switching element 9 is controlled to ensure a permanent connection with one of the connecting lines 7 and the transmission base then functions in the same way as the traditional transmission bases whose structure was recalled at the beginning of this description. In this case, the number of emitters 8 may be limited to the number of numerical treatment units 4. Whenever the number of frequencies to which emissions are made exceeds the number of numerical treatment units, or where a permanent emission on a beacon frequency is desired, it is advantageously provided that inserting body 8, in addition to the sending units associated with the numerical processing units · the corutation 9 associated with the inserting sending unit then includes means for detecting the transmission message from the set of numerical processing units to command an insert emission with the beacon frequency, when none of the other transmitters emit a signal at the beacon frequency.

113

OE-442 cas 2 GP-AG

<img file="PT94343B_D0005.tif" />

In this case, the transmission base according to the invention still has an advantage over conventional transmission bases or a complete line comprising a receiving organ, a numerical treatment unit and an emitting organ having to be associated. The frequency of beaconing. Of course, the invention is not limited to the described embodiment and embodiments may be made without departing from the scope of the invention.

In particular, although in the described embodiment a telephone line 5 'associated with each numerical treatment unit 4 had been represented, the same telephone line po. be associated with several treatment units, depending on the respective capacities of the telephone line and the numerical treatment units ·