FR2838011A1 - Mobile phone network (4) peer to peer message box notification system uses short range links between phones to reach outside coverage zone - Google Patents

Abstract

A mobile phone network (4) peer to peer message box notification system sends notifications with whole or summary messages from a fixed message box notification (16) transmitter (10) through mobile units (6, 7) with mutual exchange (62) and memory (38) and notification processing (54) linking them to memory (80) in mobiles (8).

Description

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  A system and method for notification of

  presence of one or more messages in at least one mailbox.

  More specifically, the system comprises: - an information transmission network capable of recording the or each message in said at least one messaging box and comprising a fixed transmitter of signal of notification of the presence of a message in a messaging box, and - at least one terminal for consulting, by a user, the notification signal emitted by the fixed transmitter so as to inform this user of

  the presence of a message in a mailbox.

  Many mobile operators today offer a messaging service such as voicemail. With this voicemail service, a sender can drop a voicemail message in a voicemail box, also known as a recipient's voicemail box. The recipient is equipped with a mobile phone. When this mobile telephone is in a coverage area of a transmitter / receiver of the telephone operator, the transmitter / receiver delivers, to this mobile telephone, a signal of notification of the presence of a message in the box. 'te vocal. The mobile phone then displays an icon indicating to the recipient that he has received a message in his voice mailbox. Then the recipient dials the phone number

  of his voice mailbox to consult the received message.

  However, if the recipient is not within a coverage area of the telephone operator, he cannot be informed of the presence of a

  message in his mailbox.

  The invention aims to remedy this drawback by proposing a system capable of notifying the presence of a message in a mailbox, even if the terminal for consulting the message is not in

  a telephone operator coverage area.

  The subject of the invention is therefore a system as described above, characterized in that the system comprises at least one mobile device forming a relay between the fixed transmitter and said at least one consultation terminal, each mobile device being equipped:

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  - an electronic memory capable of containing at least one notification signal emitted by the fixed transmitter, and - means for restoring the or each notification signal,

  contained in said memory, at each corresponding consultation terminal.

  According to other characteristics of a system according to the invention: it comprises at least two mobile devices, and these mobile devices are equipped with means for exchanging the or each notification signal contained in their respective memories, - the signal notification contains an identifier of the consultation terminal for which it is intended, and the consultation terminal only comprises means for presenting the or each notification signal intended for it, the notification signal contains a summary of the message, the signal notification contains the complete message, - each message is a voice message, - the information transmission network is capable of transporting voice messages to a recipient's mailbox and includes a fixed receiver of voice messages to be transported, the electronic memory of the mobile device is capable of containing one or more voice messages intended to be received by the e fixed receiver, and the mobile device comprises means for deferred transmission to said fixed receiver of or each voice message contained in its memory, each consultation terminal is mobile and the system comprises a mobile unit containing a consultation device mobile and a mobile device,

  - the mobile device is housed in a watch.

  The invention also relates to a method of notification of the presence of at least one message in at least one messaging box, the method comprising: - a step of transmitting a signal of notification of the presence of a message in a mailbox from a fixed transmitter on a network

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  for transmitting information capable of recording the or each message in said at least one messaging box, and - a step of consultation, by a user, of the notification signal emitted by the fixed transmitter during the step transmission from at least one consultation terminal, so as to inform this user of the presence of a message in a messaging box, characterized in that this method also comprises: - a step of recording of at least one notification signal emitted by the fixed transmitter in an electronic memory of a mobile device forming a relay between the fixed transmitter and said at least one consultation terminal, and - a step of restitution of the or each notification signal contained in the memory of the mobile device, at each terminal of

corresponding consultation.

  According to other characteristics of a method according to the invention: it comprises a step of exchanging, between at least two mobile devices, the or each notification signal contained in their respective memories, - it also comprises: - a step of receiving voice messages by a fixed receiver of an information transmission network capable of transporting voice messages to a recipient's mailbox, and - a step of deferred transmission of one or each message voice in the memory of the mobile device to the receiver

  fixed network information transmission.

  The invention also relates to a mobile device intended to be used in a system for notification of the presence of at least one message in a messaging box according to the invention, characterized in that it comprises: - an electronic memory capable of containing at least one notification signal sent by the fixed transmitter, and

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  - means of restitution of or each notification signal,

  contained in said memory, at each corresponding consultation terminal.

  The invention will be better understood on reading the description which will

  follow, given only by way of example, and made with reference to the drawings, in which: - Figure 1 is a schematic view of a first embodiment of a system according to the invention, - Figure 2 is a view of an extract from a notification table used in the system of FIG. 1, - FIG. 3 is a diagrammatic illustration of a geographical situation in which the system of FIG. 1 is implemented, - the FIG. 4 is a flow diagram of a method of notification of the presence of one or more messages in accordance with the invention, and FIG. 5 is a schematic illustration of a variant of a

  mobile device implemented in the system of FIG. 1.

  FIG. 1 represents a system 2 for notification of the presence of one or more messages in a mailbox. This system includes an information transmission network 4 capable of transmitting a notification signal of the presence of a message to mobile devices, themselves adapted to restore the notification signal received at terminals.

  for consulting the notification signal.

  Mobile devices are intended to be carried by

  users or to be integrated into a vehicle, such as a motor vehicle.

  For example, mobile devices are housed in watches or

bracelets, or key chains.

  The system 2 comprises a large number of mobile devices, similar to each other, and a large number of consultation terminals, also similar to each other. Mobile devices or cons u lt ing termi ns are similar in the sense that they are able to

  perform the same functions within the notification system described here.

  However, these mobile devices or consultation terminals are not all necessarily identical to one another. For example, they may differ in appearance or in the fact that some of them incorporate

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  additional functions unnecessary for the implementation of the notification system 2. Thus, in the same notification system, some of the mobile devices are possibly integrated into watches, while

  other mobile devices are in the form of a keychain.

  By way of illustration, the system 2 will be described here in the particular case where it only comprises two mobile devices 6, 7 each integrated into a watch, and only one consultation terminal 8 integrated into a mobile telephone. The information transmission network 4 comprises several fixed transmitters / receivers capable of exchanging information with the mobile devices 6, 7 when the latter are in their coverage area. In particular, the transmitters are capable of transmitting to the mobile devices 6, 7 signals for notification of the presence of a message in a messaging box. The receivers are, in turn, suitable for receiving

  voice messages transmitted by mobile devices 6, 7.

  Here, by way of example, the network 4 is a mobile telephone network.

  In FIG. 1, only a transmitter 10 and a receiver 12 of the network 4 have been shown. The transmitter 10 is associated with means 14 for storing information forming a messaging box. These means 14 are intended to contain a notification table 16. This notification table contains the list of notification signals to be transmitted to mobile devices 6 via the transmitter 10. This table 16 will be described in more detail in

look at figure 2.

  The receiver 12 is capable of receiving voice messages transmitted by the mobile devices 6, 7, these received voice messages being intended for

  be transmitted, via the network 4, to a recipient.

  By way of example, these voice messages are recorded here, by the network 4, in a voice box 18 intended to be consulted by the recipient.

messages.

  Here, the transmitter 10, respectively the receiver 12, is a radio transmitter, respectively a radio receiver, having a limited range defining a coverage area. The transmitter 10 and the receiver 12 are here located close to each other so as to define the same coverage area 20 (FIG. 3) inside which the mobile devices 6 are able to

  communicate with the transceiver 10,12.

  The example notification table 16 shown in FIG. 2 has four columns 22 to 25 and rows on each of which is recorded a notification signal. Column 22 is intended to contain the identity of the recipient of the notification signal. This column contains, for example, a number of

  telephone of a consultation terminal, such as the consultation terminal 8.

  Column 23 shows the date on which the notification signal

was created.

  Column 24 contains a summary of the content of the message,

  presented in alphanumeric characters.

  Column 25 includes a sound file containing the voice message to be transmitted. By way of illustration, only one line 27 containing data has been shown. The dotted lines drawn on the other lines indicate that only part of the notification table 16 has been represented in this illustration. Line 27 includes, in column 22, the telephone number of the consultation terminal 8, in column 23, the date of creation of this notification signal, in column 24, the text "Memo" and in the

  column 113, a sound file called "MS.WAV".

  The mobile devices 6 and 7 are similar, thus, only the mobile device 6 will be described in detail and only as regards the functions

  used in the system according to the invention.

  The mobile device 6 comprises a radio receiver 30, a radio transmitter 32, a short distance receiver 34, a short distance transmitter 36 and

a memory 38.

  The receiver 30 and the transmitter 32 are capable of establishing radio links 40, 42 for transmitting information, respectively with the transmitter 10 and the receiver 12, when the mobile device 6 is located in the

coverage area 20.

  The short distance receiver 34 and the short distance transmitter 36 are capable of establishing radio links 44, 46 for transmitting information, respectively with a short distance transmitter 48 and a short distance receiver 50, of the consultation terminal 8. These transmitters 36, 48 and these receivers 34, 50 are, for example, compliant with the Bluetooth standard. The information transmission links 44, 46 are established only when

  the mobile device 6 is near the consultation terminal 8.

  The device 6 also includes recording means 52 and restitution means 54 connected respectively to the receiver 30 and to

The transmitter 36.

  The recording means 52 are intended to record in the memory 38 the notification table 16 received via the transmitter 10

and receiver 30.

  The restitution means 54 are suitable for transmitting, via the emitter 36, the notification table 16 contained in the

  memory 38 at the consultation terminal 8.

  In order to be able to also transport voice messages from the consultation terminal 8 to the receiver 12, the mobile device 6 includes means 56 for recording voice messages and means 58 for transmitting recorded voice messages, deferred to the

receiver 12.

  These voice messages transported from the terminal 8 to the receiver 10 often, but not only, form responses to a voice message previously received by the terminal 8. In order to distinguish these voice messages from those contained in the notification signals, these messages

  will be called "voice responses" in the remainder of the description.

  The recording means 56 are associated with the receiver 34 and with the memory 38 so as to record the voice responses transmitted, by the

  consultation terminal 8, in memory 38.

  The transmission means 58 are associated with the transmitter 32 and with the memory 38, so as to transfer the voice responses recorded in the

  memory 38, via the transmitter 32, to the receiver 12.

  The recording means 52 and the transmission means 58 are capable of being activated automatically when the mobile device is

  in the coverage area 20 and that the radio links 40 and 42 are established.

  The restitution means 54 and the means 56 for recording voice messages are suitable for being activated automatically when the mobile device 6 is close to the consultation terminal 8 and the

  radio links 44 and 46 are established.

  Finally, the moblie device 6 includes means 60 for updating the notification table contained in the memory 38 and means 62

  exchange of notification tables.

  The updating means 60 are able to manage the content of the notification tab contained in the memory 38 so as to optimize the available storage space. For example, these updating means 60 erase the oldest redundant information and notification signals to free up space in the memory 38 for storing

new notification signals.

  The updating means 60 are suitable for being activated automatically on each reception, through the receiver 30 or through the receiver 34, of new notification signals to

save to memory 38.

  The exchange means 62 are suitable for managing the exchange of notification signals between the mobile device 6 and a similar mobile device, such as the mobile device 7. For this purpose, the exchange means 62 are associated with the memory 38 and to the transmitter so as to establish a radio link 64 for transmitting notification signals, contained in the memory 38, to the mobile device 7. The exchange means 62 are also associated with the receiver 34 to establish a link radio 66 for receiving the notification signals contained in the memory of the mobile device 7. The exchange means 62 are suitable for being activated automatically when the mobile devices 6 and 7 are close to each other and preferably

  less than 10 meters from each other.

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  These means 62 are also suitable for exchanging, between mobile devices 6 and 7, the voice responses contained in their memories

  respective via these same radio links 64 and 66.

  The means 60 and 62 are produced in a conventional manner by a person skilled in the art, for example, using programmable microcontrollers. The

  material structure of these means will therefore not be described here in more detail.

  The consultation terminal 8 comprises a memory 80 associated with means 82 for presenting notification signals and with means 84

  acquisition of a voice response.

  The memory 80 is able to contain notification signals received via the receiver 50, voice responses intended to be sent via the transmitter 48 and a unique identifier of the consultation terminal 8. For this purpose, the memory 80 is connected to the transmitter 48 and to the receiver 50. The identifier of the consultation terminal 8 is. through

  for example, the telephone number of this terminal.

  The means 82 for presenting the notification signals recorded in the memory 80 here include, by way of example, a loudspeaker 94 intended to listen to the voice message contained in the notification signal, a screen 96 intended to display the summary of the signal notification and a light-emitting diode 98 for indicating the presence of a notification signal. Activation of speaker 94 and screen 96 is controlled by

  the user of the terminal 8 via a keyboard 100.

  The presentation means 82 are adapted to compare the identifier of the terminal 8 with the identifier contained in each notification signal to allow consultation of a notification signal only in the event of a match between the identifier of the terminal 8 and the identifier

  contained in the notification signal stored in memory 80.

  The means 84 are able to digitize a voice response and record it in the memory 80. To this end, they include in particular a microphone 106 and a button 108 for activating the recording of a

  voice response in memory 80.

  The operation of the system 2 will now be described with reference to FIG. 4 and in the particular case of the geographical location

shown in Figure 3.

  FIG. 3 represents three sites 120, 122 and 124 distant from each other

  S from others. Site 120 includes the fixed transmitter 10 and the fixed receiver 12.

  The site 122 is a point of exchange for the notification signals between the mobile device 6 and the mobile device 7. A dotted line represents an exchange area 126 inside which the mobile devices 6 and 7 must be located. so that the exchange of notification signals can take place between these two mobile devices. Site 122 is located outside the areas of

network coverage 4.

  Site 124 is a consultation point. It includes the consultation terminal 8. A dotted line around the site 124 defines a consultation zone 128 inside which the mobile device 7 and the consultation terminal 8 must be located so that the latter receives the signals of notification. An arrow 130, oriented in both directions, connects the interior of the coverage area 120 to the interior of the exchange area 126. This arrow represents the back and forth movement of the mobile device 6 between the area of

  cover 20 and the exchange area 126.

  An arrow 132, oriented in both directions, connects the interior of the exchange area 126 to the interior of the consultation area 128. This arrow 132 represents the back and forth movement of the mobile device 7 between

  inside the exchange area 126 and inside the consultation area 128.

  When the mobile device 6 is in the coverage area 20, a step 150 of information exchange, between the mobile device 6 and the network 4 is automatically performed. This step 150 mainly comprises an operation 152 for transmitting the voice responses contained in the memory 38, an operation 154 for recording, in the memory 38, new notification signals and an operation 156 for managing the

memory 38.

  During operation 152, the voice responses contained in the memory 38 are transmitted to the receiver 12 via the radio link 42. Once these voice responses are received by the receiver 12, the network 4 transmits and stores them, for example, in the recipient's voicemail 18. During operation 154, the mobile device 6 establishes the radio link 40 with the transmitter 10. Next, the recording means 52 record the notification table 16 transmitted by the transmitter 10 in the memory 38. The recordings of this notification table 16 are added

  to the notification table already contained in memory 38.

  Then, during operation 156, the updating means 60 determine the redundant information and erase it, so as to

  minimize the space occupied by the notification table in memory 38.

  At the end of step 150, a first operator carries out a step of transporting the mobile device 6 from the coverage area 120 to

  inside the trading area 126.

  When the mobile device 6 and the mobile device 7 are both present in the exchange zone 126, a step 162 of exchange

  between mobile devices 6 and 7 is automatically performed.

  This step 162 mainly comprises three operations 164, 166 and 168.

  During operation 164, the notification signals contained in the memory 38 of the mobile device 6 are transmitted to the mobile device 7 and vice versa via the radio links 64 and 66. At the end of this exchange of signals from notification, each of the mobile devices registers

  in its own memory the new notification signals received.

  Then, during operation 166, each of the mobile devices

  performs a memory management operation, similar to operation 156.

  During operation 168, the voice responses contained in the mobile device 6 are transmitted to the mobile device 7 and vice-versa via these same radio links 64 and 66. The new voice responses received are recorded in the respective memories of

each of the mobile devices.

  At the end of this step 162, the first operator proceeds to a step 169 of transporting the mobile device 6 from site 122 to site 120, while a second operator proceeds to a step 170 of transporting the

  mobile device 7 from site 122 to site 124.

  At the end of step 169, the method therefore returns to step 150.

  When the mobile device 7 arrives in the consultation area 128 of the site 124, a step 171 of exchanging information between the mobile device 7 and the consultation terminal 8 is automatically performed. During this step 170, an operation 172 for restoring the notification signals contained in the memory of the mobile device 7 to the consultation terminal 8 is executed. During this operation 172, the mobile device 7 transmits, via its short distance transmitter, the notification signals contained in its memory to the receiver 50 of the terminal 8. Then,

  the terminal 8 records, in its memory 80, these notification signals.

  During this step 171, the terminal 8 also performs an operation 174 for transmitting the voice responses contained in its memory 80 to the mobile device 7. This mobile device 7 then records

  in its own memory the voice responses received.

  Then, still during this step 171, the mobile device 7 proceeds to an operation 176 for managing its memory. Operation 176 is

similar to operation 156.

  At the end of this step 171, the second operator proceeds to a step 178 of transporting the mobile device 7 from site 124 to site 122, while a third operator proceeds to a step 180 of using the

terminal 8.

  This step 180 comprises an operation 182 of presenting, to the third operator, notification signals and an operation 184

  recording new voice responses in memory 80.

  During operation 182, the presentation means 82 determine, by comparing the identifier of each of the notification signals received with the identifier of the terminal 8, which are the notification signals intended for this terminal. If notification signals are intended for the terminal 8, the presentation means 82 activate the light-emitting diode 98, thereby indicating that voice messages are present in the mailbox of the operator of the terminal 8. In the mode embodiment described here, this operator also has the possibility of commanding, using the keyboard 100, the display on the screen 96, of a summary on each of the messages received in his mailbox. It also has, in the embodiment described here, the possibility

  S to listen to the voice message itself through speaker 94.

  Then, during operation 184, the third operator activates the means 84 for acquiring a voice response by pressing the button 108 and pronounces a voice response near the microphone 106. The voice response has been spoken is then in stored in memory 80 and will be donated

  transmitted to the mobile device 7 during the next step 171.

  Thus, the system 2 described here makes it possible to transmit to a consultation terminal situated outside a coverage area of a telecommunications network a notification signal indicating that a message has been received

in his mailbox.

  In addition, in the particular case of the system 2 described here, the consultation terminal 8 receives voice messages without being in an area of

  coverage of the information transmission network 4.

  Finally, this system 2 also has the advantage that a voice response can be transmitted, from the consultation terminal 8, without the latter being in a coverage area of the communication network.

transmission of information 4.

  FIG. 5 represents a variant of the system 2 in which the mobile device 6 and the consultation terminal 8 are integrated into the same mobile telephone 200. This mobile telephone 200 is suitable for performing all the conventional functions of a mobile telephone in addition to the functions of the mobile device 6 and of the consultation terminal 8. For this purpose, the mobile telephone 200 comprises the same elements as the mobile device 6 and that of the consultation terminal 8. However, the pairs of short-distance transmitters / receivers 36 and 34 and 50 and 48 being redundant, only the short-range transmitters 36 and 34 are retained. Similarly, memories 80 and

  38 are replaced by a single common memory 202.

  This mobile phone 200 therefore combines the functions of a device

  mobile and a consultation terminal in a single mobile device.

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  Thus, the example of operation of the system for notification of the presence of one or more messages in a mailbox described with reference to FIG. 3 can be produced identically by replacing the mobile device 6, the mobile device 7 and the consultation terminal 8 respectively by a first, a second and a third mobile telephone similar to the mobile telephone 200. Thus, in this variant, only one type of apparatus is used as well for propagating notification signals only to consult them. Of course, the various embodiments of the mobile device and of the consultation terminal described here can be combined in the same notification system. For example, such a notification system simultaneously comprises mobile devices integrated in watches, in

  key fobs and in mobile telephones, such as the 200 mobile phone.

  The system 2 has been described here in the particular case where the notification signals also include the voice message itself. However, as a variant, the notification signals include, for example, only the identifier of the recipient's consultation terminal. Thus, in this variant, the consultation terminal only informs the operator that a voice message has been received in the mailbox. The operator must then move to a coverage area of the information transmission network 4 to receive the messages. Advantageously, in this variant, the notification table comprising only, for each notification signal, the recipient's identifier, is transmitted in the form of a

  SMS message (Short Message Service).

  In another variant, the mobile device is adapted to transmit, to the consultation terminal, only the notification signals corresponding to the unique identifier of this consultation terminal. In this variant, the operation 164 of exchanging the notification signals is first preceded by an operation of transmitting the identifier of the consultation terminal to the mobile device and of selection, by this mobile device, of the single signals notification to be transmitted comprising an identifier corresponding to the identifier received from the consultation terminal. Thus, in this variant, the presentation means of the consultation terminal display

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  all notification signals received. Indeed, in this variant, the memory 80 of the consultation terminal only includes notification signals intended for this consultation terminal and it is therefore no longer necessary to select, from the notification signals received, those which are intended for this purpose. terminal. This variant offers better protection of the confidentiality of the notification signals since, on the one hand, the mobile device alone is not capable of presenting the notification signals and, on the other hand, the consultation terminal receives only signals from

  notification intended for him.

  System 2 has been described in the particular case where the messages are voice messages. However, in a variant, these messages are only formed of alphanumeric characters intended to be displayed on

a screen.

  In a very simplified variant of the system 2, the mobile device 6 does not include means for exchanging notification signals with other mobile devices. Thus, in this variant, the notification signals cannot propagate step by step through the intermediary

of multiple mobile devices.

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Claims (13)

  1. System for notification of the presence of at least one message in at least one messaging box, the system comprising: - a network (4) for transmitting information capable of recording the or each message in said at least one messaging box and comprising a fixed transmitter (10) for signaling the notification of the presence of a message in a messaging box, and - at least one consultation terminal (8), by a user, of the notification signal emitted by the fixed transmitter (10) so as to inform this user of the presence of a message in a mailbox, characterized in that the system comprises at least one mobile device (6, 7) forming a relay between the fixed transmitter and said at least one consultation terminal, each mobile device (6,7) being equipped with: - an electronic memory (38) capable of containing at least one notification signal emitted by the transmitter fixed (10), and - means (54) for restoring the or each if general notification, contained in said memory (38), at each terminal of corresponding consultation (8).   2. System according to claim 1, characterized in that it comprises at least two mobile devices (6, 7), and in that these mobile devices (6, 7) are equipped with means (62) for exchanging the or of each signal from   notification contained in their respective memories (38).   3. System according to any one of the preceding claims,   characterized in that the notification signal contains an identifier of the consultation terminal for which it is intended, and in that the consultation terminal (8) only comprises means (82) for presenting the or   of each notification signal intended for it.   4. System according to any one of the preceding claims,   characterized in that the notification signal contains a summary of the message.   5. System according to any one of the preceding claims,   characterized in that the notification signal contains the complete message.   6. System according to any one of the preceding claims,   characterized in that each message is a voice message. 283801 1   7. System according to claim 6, characterized in that the information transmission network (4) is capable of transporting voice messages to a recipient's mailbox (18) and includes a fixed receiver ( 12) of voice messages to be transported, in that the electronic memory (38) of the mobile device (6, 7) is capable of containing one or more voice messages intended to be received by the fixed receiver (12), and in that the mobile device (6, 7) comprises means (58) for deferred transmission to said fixed receiver (12) of or each voice message contained in its memory (38).   8. System according to any one of the preceding claims,   characterized in that each consultation terminal (8) is mobile and in that the system comprises a mobile box containing a device for   mobile consultation and a mobile device.   9. System according to any one of the preceding claims,   characterized in that the mobile device is housed in a watch.   10. A method of notification of the presence of at least one message in at least one mailbox, the method comprising: a step of transmitting a signal of notification of the presence of a message in a messaging box from a fixed transmitter (10) of an information transmission network (4) capable of recording the or each message in said at least one messaging box, and - a step (180) of consultation, by a user, of the notification signal transmitted by the fixed transmitter (12) during the step of transmission from at least one consultation terminal (8), so as to inform this user of the presence of a message in a mailbox, characterized in that this method further comprises: - a step (154) of recording at least one notification signal sent by the transmitter fixed (10) in an electronic memory (38) of a mobile device (6, 7) forming a relay between the fixed transmitter (10) and said at m oins a consultation terminal (8), and - a step (172) of restitution of or each notification signal contained in the memory (38) of the mobile device (6, 7), at each   corresponding consultation terminal (8). 283801 1   11. Method according to claim 10, characterized in that it comprises a step (164) of exchange between at least two mobile devices (6, 7), of or each notification signal contained in their respective memories.   S 12. Method according to claim 10 or 11, characterized in that it comprises: - a step of receiving voice messages by a fixed receiver (12) of a network (4) for transmitting information capable of transporting the messages voice to the mailbox (18) of a recipient, and - a step (152) of delayed transmission of one or each voice message contained in the memory (38) of the mobile device (6, 7 ) to the   fixed receiver (12) of the information transmission network (4).   13. Mobile device (6, 7) intended to be used in a system for notification of the presence of at least one message in a mailbox   according to any one of claims 1 to 9, characterized in that it   comprises: - an electronic memory (38) capable of containing at least one notification signal emitted by the fixed transmitter (10), and - means (54) for restoring the or each notification signal, contained in said memory ( 38), at each terminal of