FR2976438A1 - MODULAR DEVICE FOR WIRELESS DATA TRANSMISSION - Google Patents

Abstract

The invention relates to a device (10) for the wireless transmission of data, comprising: - a router (11), - at least one radio (12), associated with said router (11), - an autonomous source of power supply. energy (13), capable of supplying at least the router (11) and the radio (12), and - a first housing (1). It is essentially characterized in that it further comprises: - a second housing (2), in that - the router (11), said radio (12) and said power source (13) are distributed between the first (1) and the second housing (2), and in that - the first housing (1) and the second housing (2) are removably attachable to each other.

Description

i MODULAR DEVICE FOR WIRELESS DATA TRANSMISSION.

The present invention relates to the field of wireless data transmission.

It finds particular application in temporary networks, including meshed wireless networks, called mesh or Wimesh networks, in which all radio communication nodes are connected from near to near without a central hierarchy, and more particularly wireless networks. High Speed.

Originally from the military field, these networks now find applications that are also civil, for example, for services adapted to the market for regional security and video surveillance, thanks to broadband, to radio and mobile network deployments, easy and fast.

More precisely, the invention relates, according to a first of its objects, to a device for the wireless transmission of data, comprising: a router, at least one radio, associated with said router, an autonomous source of power supply, capable of power at least the router and the radio, and a first housing. Such a device is known to those skilled in the art, for example by devices in which the transmission part (router & radio (s)) and the power supply part (battery) are integrated in the same integrated Pelicase case or case. (trademark). However, this type of device has the disadvantage of being relatively heavy, unwieldy, and difficult to evolve. The present invention aims to overcome these disadvantages by providing an adaptable modular solution.

With this objective in view, the device according to the invention, furthermore in accordance with the preamble cited above, is essentially characterized in that it further comprises: at least one second housing, in that the router, said radio, and said power source are distributed between the first and the second housing, and in that the first housing and the second housing are removably attachable to each other.

The modularity of the invention allows that any other boxes, each incorporating one or more modules (transmission, batteries, etc.), can also be assembled to one of the first two housings in a modular and removable manner.

It is thus possible to add complementary functional modules (power supply adaptation module for specific sensors / video cameras, module of another energy source - for example a solar energy source, module adaptation to another energy source, other transmission modules, location module, network data storage module, relating to the (x) sensor (s), ...) as described later.

Thanks to this feature of modularity, the device is particularly manageable and much easier to deploy. The same individual 30 may for example carry in each hand a respective housing, which allows to better distribute the load compared to the integrated bag type solutions and also facilitates its handling. 3 Thanks to this modular feature, it is very easy to replace a faulty, worn or discharged power supply without dismantling the whole system: it is enough to disassemble only the box (or module) including the faulty battery. Reciprocally the device is also designed to allow the addition of additional battery modules chaining, allowing an increase in autonomy for a given system, as described later. Thanks to this modular feature, the device allows to functionally evolve separately each of the housings; it is possible for example to develop separately the transmission part or the supply part.

Thus, the device is adaptable for example by adaptation of the power supply to the consumption of the device and / or by adaptation of the type of sensors to the use of the device; for example optical cameras, IR, vibration sensors, etc. One can for example increase or decrease easily and quickly the autonomy of a device according to the invention, by choosing an adequate number of battery modules.

In one embodiment, the device further comprises a removable attachment system of the first housing and / or the second housing to a support, the removable attachment system comprising: a flexible and reusable removable attachment means capable of exert a force of friction on the support. Thanks to this feature, the device is very quick to install / uninstall including on different types of media.

In one embodiment, the removable attachment system 30 comprises: a first fastening element and a second fastening element, the first fastening element being integral with the first or the second case, the second fastening element being removably attachable to said support, the first and second attachment members being detachably attachable to each other.

With this feature, it is very easy and light to hang on the support first the second fastener and then to hang a box on the second fastener. It is then possible to hang another housing on the housing already in place or on a support (the same support or another), and this for a plurality of boxes, then to connect to an electrical network and possibly a data network the boxes between them. In one embodiment, the removable attachment system comprises friction elements, which can exert on the support a friction force greater than the force due to the weight of the housing, when the housing is hooked to the support.

With this feature, it is possible to assemble or plug a plurality of boxes between them without risk of falling from the device.

20 The removable hanging system makes it possible to install and uninstall a device very quickly. For example a device can be assembled / disassembled in less than 5 minutes by one person, by hand and without tools.

In one embodiment, the first housing and the second housing (and / or the first attachment member and the second attachment member) are removably attachable to one another by magnetization, at least one said first housing (respectively first fixing element) and second housing (respectively second fixing element) comprising at least one magnet. Thanks to this feature, it is possible to assemble two boxes or two fasteners relatively coarsely with one another, ie with an approximate relative angular position, which allows for example a very fast deployment. .

In one embodiment, it is possible to obtain a device equipped with at least two handles, each handle being located for example on a respective face of the device and arranged at 90 °.

In one embodiment, the device comprises a foot through which the first housing and the second housing are hookable to each other. That is to say, the attachment system of the first housing with the second housing includes a foot, so that the foot and the attachment system of the two boxes are secured.

With this feature, the modular device remains compact.

In one embodiment, the foot includes a recess for gripping the device when the first housing and the second housing are hooked to each other. Thanks to this feature, the device is very handy, the recess can be used as a carrying handle or maintenance during installation / installation.

The device may include a power output. In one embodiment, a sensor of the device is connected to this power output, the router being configured to control power and power consumption of said sensor. In particular, it is possible to provide at least one sensor connected to a power output and a data network output of the router, the router being configured to control the power supply and the energy consumption of said sensor as well as the data exchanges between the router and the sensor, the power output and the data network output can be the same (POE for Anglicism Power Over Ethernet). Thanks to this characteristic, the device can control its overall consumption and better manage it.

The device may comprise other housings with complementary functional modules, hookable together, to said first housing / second housing and / or a support (possibly common).

We can therefore provide at least a third housing. In one embodiment, the third housing is hookable to said first / second housing and comprises either an autonomous source of power supply capable of supplying at least said router, or a specific module. By specific module, for example means an adaptation module 15 of the power supply for specific sensors / video cameras, an adaptation module to another energy source, a transmission module, etc.).

It is thus possible to provide a plurality of boxes, at least one of which is capable of being hooked to a support, said boxes being assembled in pairs in a detachable manner, connected to an electrical network and possibly to a data network, so that that one of said boxes comprises an autonomous source of power supply, capable of supplying at least the router and the radio.

In particular, it is possible to provide a device comprising a plurality of batteries connected in electrical network and in data network between them and to the router, in which each battery has a respective address.

The chaining of the batteries to each other makes it possible to increase the autonomy of the device in a modular manner. It transfers energy from more charged batteries to other, less charged batteries. The respective address allows the router a dialogue with each battery and thus the management of the overall and specific power supply of each battery (for example on the current consumption, the remaining charge, the temperature, etc.) by software dedicated. The invention makes it possible to intelligently manage the chaining of batteries. The address of each battery allows the router a dialogue with each battery and thus the management of the overall and specific power supply of each battery by software via the common router to which they are connected.

In one embodiment, the device further includes a remote control configured to control the start / stop of the router. Thanks to this characteristic, the consumption of the device is limited and controlled remotely, which can be particularly useful in surveillance applications, for example when the sensor is a camera.

In one embodiment, the device comprises a first light source, whose operating ignition frequency indicates whether the battery is on and / or charging and / or in use, as well as its battery level. charge.

Thanks to this characteristic, the device is compact and consumes less than those using a vumeter.

Similarly, in one embodiment, the device comprises a second light source, whose operating ignition frequency depends on the power of the signal received by a given radio.

According to another of its objects, the invention relates to a system for the wireless transmission of data comprising a plurality of devices according to the invention, in which at least two devices are capable of communicating with each other in a network (R).

Thanks to this feature, the device can be implemented in a network in particular meshed and deployed on any type of terrain. In one embodiment, the system further comprises one or more gateways for connecting the network (R) formed by said plurality of devices, capable of communicating with each other, to one or more other infrastructure networks (operated or private). ) or access (W). By access network is meant at least one sensor, for example a presence sensor (IR, laser), radar, sound sensor (screams, detonation ...) connected to a clean gateway, and using a particular frequency.

In one embodiment, the system includes a frequency scanner, allowing autonomic network configuration for optimized performance. Indeed, thanks to this characteristic, the system can adapt itself and allow an optimized data transmission.

Thanks to the invention, it is possible to implement wireless networks with high performance and reliability (high resilience) both fixed and mobile, immediately deployed, temporarily and possibly urgently.

In one embodiment, two radio deployments measured radio speeds of up to 300 Mbit / s (150 Mbit / s useful) for each of the two radios, for a total of 600 Mbit / s radio (300Mbit / s). s useful).

Other characteristics and advantages of the present invention will appear more clearly on reading the following description given by way of illustrative and nonlimiting example and with reference to the appended figures in which: FIG. 1 illustrates an embodiment of the device according to the invention before assembly of two boxes on either side of a foot, - Figure 2A illustrates an embodiment of the device according to the invention wherein said device is hung directly around a support, - FIG. 2B illustrates an embodiment of the device according to the invention in which said device is hooked to a support by means of a first fastening element and a second fastening element which can be attached to one another. other, - Figure 3A illustrates an embodiment of a mechanical coupling of two boxes together, - Figure 3B illustrates an embodiment of a magnetic latching of two boxes between them, - Figure 4A illustrates an embodiment of the attachment of three boxes together, - Figure 4B illustrates an embodiment of the attachment of three boxes to a same support, - Figure 4C illustrates an embodiment of the attachment of two boxes together and to the same support, - Figure 4D illustrates an embodiment of the attachment of several boxes chained together and hung on the same support. FIG. 5 illustrates an embodiment of the system according to the invention, FIG. 6 illustrates an embodiment of the device according to the invention comprising a camera-type sensor, FIG. 7 illustrates an embodiment of the device. according to the invention hooked on a support by means of a second fixing element, and 20 - FIG. 8 illustrates an embodiment of the device according to the invention in which each box comprises a respective handle, positioned in planes. different.

There is provided here a device for the realization of an ad hoc network of wireless data transmission.

An embodiment of the device 10 for the wireless transmission of data in a network is illustrated in FIG. 1. It comprises a router 11, ensuring the routing of the data packets in the network. Advantageously, the router 11 may include a POE socket for "Power Over Ethernet" (or IEEE 802.3af standard) which makes it possible to pass a supply voltage in addition to the data. The router 11 comprises a processor (not illustrated) which executes, in particular, the routing and detection programs of the network topology. In one embodiment for dissipating the heat of this processor, the housing has, on the outside, fins 19 for discharging the internal heat. To further increase the efficiency of these fins, the processor is pressed on the inner part of the case using insulating thermal paste. This makes it possible to use the entire surface of the housing to evacuate heat and therefore a maximum of fin. This makes it possible not to implement a fan. The housings 1, 2 are intended for outdoor operation and have been tested at temperatures down to -30 ° C.

The data is sent / received by at least one radio 12, associated with said router 11, and which allows the transfer of the data streams on at least one radio frequency. For brevity will be heard later by "the radio" 15 a set of at least one radio 12, 12 '.

There is also provided at least one autonomous power supply source 13 capable of supplying at least the router 11 and the radio 12, for example rechargeable batteries. For example Lithium Iron (LiFePO4) batteries are provided, which do not present a risk of explosion, while providing a good power / size / weight compromise. The power supply source can also be a source of solar energy 131, or wind power. For the sake of brevity, any source of independent power supply will be assimilated to electric batteries 13. The router 11, the radio 12 and the power source 13 are distributed between a first housing 1 and a second housing 2, c that is, the router 11, the radio 12 and the power source 13 are not all arranged in one and the same housing. For example the first housing 1 contains the router 11 and the radio 12; and the second housing 2 contains the power source 13.

Preferably, the housing comprising the router is placed high for better data transmission. 2976438 It can be provided that the boxes 1, 2, or other boxes (third housing 3 for example) are substantially identical to each other. They include, for example, orifices for the passage of LEDs (as described later). The orifices not used in some cases are closed by means of sealed plugs 32. This makes it possible to reduce the costs by using standard boxes, and also makes it possible to have a device 10 that is substantially symmetrical with respect to the stand 21 when it comprises two boxes (battery 13 and router 11, battery 13 and battery 13). which allows for example to have a second type of "cases" io extra only composed of one or two power supply modules (no transmission part).

It can be provided that the housings 1, 2 are connectable to a support 20, preferably common, without the boxes 1, 2 necessarily being in contact with each other.

Assembly of boxes between them It is possible that the boxes 1, 2, 3, 4, 5 are assembled on one of their faces so as to be adjacent, in contact, two by two. Two boxes can be removably connectable to each other, directly or indirectly. The device 10 may comprise a plurality of boxes 1, 2, 3, 4 assembled in pairs, for example by being clipped in pairs. For example, the housing 1 and the housing 2, the housing 1 and the housing 3, the housing 2 and the housing 3, or the housing 1 and the housing 2 and the housing 3 (FIG. 4A) can be assembled, or the housings 1, 2, 3, 4, 5 (Figure 4D).

The assembled boxes are temporarily secured, for example for a transport phase and / or for the use of the device. For the deployment, ie the on-site installation of the network, it is possible to install and assemble the boxes one by one, which is lighter and more manageable. Advantageously, the boxes are not required to be assembled together for the operation of the network, they can be positioned at a distance from each other as long as they are connected two by two (electrical connection, possibly connection of data,...). It can thus be provided that the boxes are assembled to a support 20, preferably common, without the boxes necessarily being in contact with each other.

According to a variant, the first housing 1 and the second housing 2 are removably connectable to one another by a mechanical force, thanks to a specific shape on one of the housings cooperating with a complementary specific shape on the housing. other boxes. Such specific shapes are, for example, of the tenon / mortise type. It is also possible to provide a projecting piece 15 (for example of the hook or pin type) on one of the boxes that can be inserted into a cavity (for example a chute) or a corresponding ring 14 on the other housing. In one embodiment, steel pegs (for example four) are provided arranged on one side of a housing and secured to it, which can be slid into cutouts of another housing, the shape of each Cutting marries that of a respective pawn. In one embodiment, the cuts are made in a catch (for example U-shaped, the base of the U is fixed on the housing and the other two faces have cutouts, and for example stainless steel) secured to the housing or directly in this and are disposed on one face of said housing. Thus, the boxes are directly assembled to each other. This variant allows for example to plug a housing into (or on) another housing.

The specific shape may be integrated in the shape of the housing, for example by molding a protruding part and / or a cavity during manufacture of the housing.

The specific shape can also be added to the housing, for example by joining (for example by screwing) an intermediate piece to one of the 30 boxes. For example, a surface of a housing may be integral with an intermediate piece having a projection, and / or a part having a cavity; a surface of another housing having an intermediate part 13 of complementary shape. Thus, the boxes are indirectly assembled to each other.

It is also possible to provide an intermediate variant consisting in integrating a specific shape in the form of a housing cooperating with a complementary shape of an intermediate piece integral with the other housing.

The boxes can thus be hung to each other removably. The advantage of these variants lies in the speed of implementation compared to solutions consisting for example of screwing / bolting two boxes to each other in which the boxes are attached to each other irremovably. According to a variant, the first housing 1 and the second housing 2 can be assembled to one another by a magnetic force, in this case at least one magnet. At least one of the first housing and the second housing comprises for example at least one magnet 16 and the other of the second housing and the first housing 20 respectively comprises a magnetizable part 17, for example at least one other magnet whose polarity is inverted, and / or a magnetizable metal element (for example a metal foil, possibly magnetized). The magnetizable piece 17 may be distinct from the foot 21 or the foot 21 may constitute said magnetizable piece 17. The magnetic variant makes it possible to arrange one of the boxes relatively to the other in a possibly relatively coarse manner (compared with the variant where the boxes are plugged in), which allows a very fast deployment of the device in the field. In the case where the first housing 1 and the second housing 2 are removably connectable to each other by means of a magnetizable metal part 17, this metal part is preferably secured to the housing 14. one of the boxes, for example by screwing / bolting. The other housing comprises at least one magnet whose intensity of the magnetic field allows the boxes to be integral with each other when the magnet is in contact with the metal part (the force exerted by the magnetic field is greater than the weight exerted by the other housing). It can also be provided that the magnetizable metal part 17 is detachably connectable to each housing by magnetic force, each housing comprising respective magnets 16.

Foot The device 10 preferably comprises a foot 21 secured to one of the boxes and for positioning said housing or the device on a substantially horizontal surface (floor, table, etc.).

As seen above, the foot 21 may be a separate element of the magnetizable metal part 17. In one embodiment, the foot 21 and the magnetizable metal part 17 may be a single element, which makes it possible to 10 more compact device.

The foot 21 has for example a shape comprising a flat plate contiguous to the surface of one of the boxes. It advantageously has a shape of L or T, so that one of the branches of L or T is a foot member on which the assembled device or at least the housing integral with the metal part can be placed.

In addition, it can be advantageously provided that the foot 21 comprises a recess 211 acting as a handle, allowing the gripping and handling of the housing whose foot 21 is secured, or the device 10 as a whole when said housing is hooked to another housing. Modularity 15 Thus, it is expected that each housing 1, 2, 3 is a module, so that the device is modular, which facilitates its handling, so the deployment of the network.

The assembled device therefore comprises a plurality of boxes or modules, so that a third box 3 may be provided, for example comprising other batteries, removably assembled to one of the boxes 1, 2 as previously described.

The assembled device 10 is in the form of a unitary assembly whose housings 1, 2, 3 are integral with each other.

The unitary unit in the form of a "suitcase" comprises at least one handle for carrying / handling the assembly on one side of the assembly. There may be a handle 212 on one side, or a handle 212 on one side and another handle 212 'on another side, or a handle on each side, which facilitates the maintenance during the installation of the device. It is thus possible to obtain a device 10 equipped with 1, 2 or 3 handles, each handle being located on a respective face of the device. It can be provided that the handles 211, 212 and 212 'are integral with the same housing or integral with a respective housing and for example arranged at 90 ° two by two (Figure 7). As seen above one of the handles can be integrated in the foot 21 through the recess 211.

Antennas Provision may be made for each housing comprising radio modules, comprising at least one antenna 22A, 22B. In one embodiment, for a housing with two radios 12, 12 ', two radio connectors may be provided for compliance with the 802.11 standard. not. The device comprises four omnidirectional dual-band antennas (2.4GHz / 5dBi 5GHz / 7dBi), not shown, two radio antennas. Of the 25 16 single polarized antennas (one connector per antenna) can be connected, but do not provide optimal performance. Dual polarized antennas (two connectors per antenna) are also compatible and provide good performance. Other types of antennas (sectoral, directives, panels, waveguides, etc.) can be provided, directly screwed to the housing comprising the radio, or connected to it by antenna cables, in the extent that the antenna connectors are standard for example type-N. The radio engineering rules for a guarantee of good performance require, in a 5GHz transmission embodiment, to ensure a gap of several tens of centimeters, vertically, between two antennas transmitting in the same frequency band. , on pain of reduced performance, especially 15 in relaying. Consequently, in cases where the overall height of the device is less than several tens of centimeters, provision may be made to install extensions integral with the housing (for example solid coaxial cables) in case of insufficient performance noted.

20 Nocking a box to a rack

It is expected that the modular device 10 through at least one housing 1, 2, 3, 4, 5 is removably attachable to a support 20 by a removable attachment system. Preferably, the support 20 allows attachment of the device 10 in height relative to the ground, which facilitates radio transmissions and can prevent vandalism.

Preferably, the support 20 is non-planar, for example such as a mast, a pylon, a lamppost, a tree trunk, a grid, a balcony, etc. around which a modular device 10 is hooked by a housing for example by means of a fastening means 31 belt type described below. A support whose cross section is generally circular (or polyhedral for some street lamps for example) is in this practice of use.

The attachment system is at least partially integral with a housing 1, 2, 3, 4, 5 and comprises a removable hooking means 31.

The removable attachment means 31 is preferably flexible and reusable, or even elastic, and comprises for example at least one belt or strap, for example a ratchet strap, for example fabric or elastomer. Such a fastening means is simple and light, which allows a fast and solid attachment of the device (or at least the housing) to a support 20, for example a pole or a public lighting pole, but also the removal of the device and the reuse of the attachment means.

The removable hooking means 31 can be secured to the housing 1, 2, 3 (FIG. 2A), which makes it possible to hook said housing directly to said support 20.

In another embodiment, the fastening system further comprises a first fastening element 321 and a second fastening element 322. The first fastening element 321 is integral with the casing 1, 2, 3. The second fastening element 321 is secured to the casing 1, 2, 3. 322 fastener can be removably assembled to said support 20, for example according to one of the attachment variants of a housing 1, 2, 3 to the support 20. The first 321 and second 322 fastening element can be assembled from Removable way to one another, for example according to one of the variants of attachment of two boxes between them. For example, it is possible for the second fastening element 322 to comprise a flexible and reusable removable fastening means 31 as mentioned above. Thanks to this characteristic, it is easy to adapt a specific fixation without necessarily modifying the boxes themselves. Preferably, the removable attachment system comprises friction elements capable of exerting on the support 20 a friction force greater than the force due to the weight of the housing when the housing is hooked to the support.

For example one can provide at least one strap 31, for example elastomer. It can also be provided that the second fastening element 322 comprises teeth D (preferably of metal) distributed in a form generally conforming to the shape of the support.

In operation, when the housing comprising the battery is assembled to another housing (comprising, for example, a router, a GPS module 23 or the like), the housing that does not include the battery is preferably fixed to the support 20 and the housing including the battery last. This allows when the battery 13 is to be replaced to be able to easily and quickly disassemble only the housing comprising the used battery, without disassembling the entire assembled device.

Electrical / network and power connectors

Two boxes are electrically connectable to each other by an electric cable 18 for electrically connecting the router 11 and the battery 13 and any equipment annexed to the housing comprising the battery 13 or another housing. The interconnection cable 18 between two boxes, for example about twenty centimeters long, advantageously serves for the power supply 25 and the data transmission between the router 11 and the battery 13.

At the level of the power cables, at least one of the following cables can be provided: - A not shown power cable, one of the sides of which can connect to a housing (including the batteries or the router), and the other side can connect via a power supply to a cigarette lighter 12V socket, preferably at least 1 meter long, 19 - An unillustrated cable whose one of the sides is likely to connect to a box (including batteries or router), and the other side is bare, allowing the user to adapt to the power of a sensor of his choice (IP camera for example), preferably at least 1 meter long, s - An unillustrated cable whose one side is likely to connect to a housing (including batteries or router), and the other side is likely to connect via a power supply to a power outlet (240V / 220 V / 110V), to charge the battery and / or operate the device without discharging the battery. It is also possible that the device is equipped with at least: a socket, for example RJ-45, to connect a set of at least one IP camera or other IP sensors, four 12V sockets. Two jacks are dedicated to connect the housing 15 comprising the router 11 to the housing comprising the battery 13. A socket is dedicated at the output to the power supply of an external sensor, for example an IP camera. A fourth power socket, input or output, allows chaining to other battery modules, or input power of the device on external 12V, or finally the input connection of the device of a power supply 220V 20 / 12V for charging the battery 13. These two input power supplies allow for example to charge the battery without disconnecting or shut down the system.

In one embodiment, the router consumes peak 10 watts when operating at full rate with 2 transmit radios. Preferably, a battery of 12Ah / 12.8V characteristics is therefore provided so as to obtain a minimum autonomy of more than 12 hours (router alone, that is to say excluding sensor supply). If a sensor 33 (camera or other) is powered by the battery, the autonomy is a function of the power consumed by this sensor. A feature of the device is that when it comprises a plurality of batteries chained to each other, each battery has a respective address, which allows the router to dialogue with each battery and thus the management of the software power supply via the device. common router to which they are connected.

Network There is provided a system for wireless data transmission comprising a plurality of devices 10 according to one of the preceding variants, wherein at least two devices are capable of communicating with one another.

In operation, provision is made for the creation of a meshed wireless R network in which each device 10 is a node of the network.

Thanks to such a mesh typology: the network R is auto-configured: the nodes are recognized and connect instantly to each other, in "ad-hoc" mode, forming a fully decentralized mesh architecture, the network R auto-cicatrizes : in the event of a link break or equipment failure, the network is automatically reconfigured by the routing protocol, allowing the streams to pass through another path, the network R can bypass geographical obstacles: in a embodiment in which a relay is provided on two radios, the rate is maintained by changing frequency at each jump, which makes it possible to easily bypass the obstacles, because there is no master base station to be located on a geographical point in height.

It can be provided that the system comprises one or more gateway modules (not shown), to one or more infrastructure or access networks, for wired or wireless connection of the local mesh network R formed by the plurality of devices. to one or more other networks W.

Data transmission In one embodiment, the data transmission between several devices 10 in the network R is done by the wireless standard radio protocol according to the IEEE 802.11n standard, and the routing of the flows is assured at the IP level by the OLSR standard mesh routing protocol. The IP flows of any sensors (IP camera or other) input are transmitted via a port for example RJ-45 present on each device.

In one embodiment, each box equipped with a router 11 has two radios, allowing the relaying of the fluxes on two distinct radio frequencies f1, f2. This makes it possible not to lose the bit rate with each radio jump, and to maintain a stable and high bandwidth from end to end. In the case of the 802.11n protocol, each physical radio card has two standard N-type connectors (ie four connectors per unit device), allowing the connection of any type of antenna, directly or via a coaxial antenna cable. The radio cards are preferably dual-band: they allow to transmit on all channels unlicensed frequencies in the 2.4GHz and 5GHz bands. The choice of the authorized channels by country or geographical zone as well as the passage from one channel to another is done by simple software configuration.

It is also possible by simple software configuration to activate the mesh routing on one or both radios or disable it on these radios that become WiFi access points.

The transmission power of a device 10 is calculated by adding the output power of the radio chipset and the gain of the antenna connected to the connector. These two parameters are expressed in decibels and modulables; in a software way for the first (choice of the transmission power at the card output via a human-machine interface) and hardware for the second (connection of an antenna with greater or lesser gain).

In one embodiment, the radio cards allow an adjustable output power by software configuration up to 21 dBm, ie 130 mW and the default antennas are dual-band with a gain of 7 dBi in 5GHz. Thus, at 22 maximum transmission power, a device 10 emits at 28 dB, or 0.63 Watts approximately. It is quite possible to have omnidirectional antennas with higher gain (10 or 13 dBi for example), but this affects the size of these antennas.

On the other hand, the choice of antennas being flexible, more directive antennas can be used. For example, coupled to dual polarized panel antennas at 19 dBi gain, the maximum power emitted by a device 10 is 40 dB, or 10 Watts. With this type of antenna, it is possible to guarantee a stable useful transmission at 150 Mbit / s between two points of view located at more than 1 km from one another.

For this purpose, it is appropriate to be in "line of sight" at these frequencies there (i.e. 15 without obstacles and sufficiently high so as not to disturb the Fresnel ellipse). For example, in the 5GHz frequency band, the height of the Fresnel lobe is 1 meter for a link of 100 meters, and 3.5 meters for a link of 1 kilometer.

It is possible by simple configuration to choose the frequency of each of the radios separately, on 19 channels in 5GHz without overlap or 13 channels in 2.4GHz.

It is also possible to replace the radio chipset with another one in 25 new frequency ranges

In one embodiment, the housing comprising the router 11 comprises two radios 12, 12 '. Router 11 can configure each radio to listen to its environment (Beacon at 802.11 level). Thus, the router 11 can detect all the other wireless networks (Wifi or others) and the power of each of them. It performs this operation for example on the whole band 2.4Ghz and 5Ghz, which takes a few seconds and allows to establish a 23 map of the best frequencies to use. Then the card is reprogrammed with its original settings.

LED To deploy the mesh network R in the field, it should be ensured that the radio links are correctly established between the devices 10. For this purpose, it is possible to provide several luminous visual indicators (not shown) per device 10, preferably light-emitting diodes (LEDs), each of which performs its own function. A removable cover can be provided to cover the LEDs so that they are not visible when they are covered by the cover. Preferably, at least three LEDs are provided. A first LED (located on the housing comprising the router) makes it possible to indicate the powering up of the router 11, for example by a continuous or flashing ignition. - A second LED (preferably located on the housing including the battery) to indicate the state of charge the battery. Preferably, the ignition frequency (number of flashes per selected time unit) is a function of the level of charge. For example, it can be provided that: - a continuous ignition corresponds to a charging rate equal to 100%, - 4 flashes correspond to a charge rate of more than 75%, - 3 flashes correspond to a charging rate of 50% at 75%, - 2 flashes correspond to a charge rate of 25% to 50%, - 1 flash corresponds to a charge rate lower than 25%. If the battery is charging on the mains, another frequency or other lighting color can be provided. In the event of an abnormality of the battery, it is also possible to provide a corresponding ignition frequency, for example a rapid flashing all the time. Thanks to this characteristic, it is possible to provide only one LED to define the state of charge, whereas according to the prior art, there are generally several LEDs whose number of lit LEDs corresponds to the level of charge 30 (vumeter). ). This optimizes manufacturing costs and consumption. - A third LED (located on the housing including the router) to indicate the reception status of the radio. If the device comprises several radios, a respective LED is provided by radio. The ignition frequency (number of flashes per selected time unit) of each LED is a function of the reception / transmission level. For example, it can be predicted that: an unlit LED means that no WiMesh radio link is established, a flashing LED indicates that a link is established, but not strong enough to obtain maximum performance (received signal strength less than a threshold, in this case 30 dB or -65 dBm), an increasingly fast flashing, proportional to the power of the received signal, an LED lit continuously once the received power is greater than a threshold in this case 30 dB (-65 dBm), indicating that the link WiMesh is perfectly established.

Thanks to these bright visual indicators, the installation and validation of the operation can be performed very easily by a non-technical operator.

Antitheft Preferably, an antitheft device is provided, for example a cable for securing the attachment of the boxes to each other and / or securing the attachment of a housing 1, 2, 3 to at least the support 20.

Remote control Turning the router on and off can be remote controlled remotely to save battery power. A remotely controlled circuit breaker system (preferably radiofrequency) allows the activation of the transmission part (router 11) remotely. In one embodiment, the remote control function is performed through an operated or professional network, which allows a greater distance between the user and the device 10.

It is also possible to provide remote activation of a router 11 from a command / control station in a software way, provided that the router 11 is in permanent standby when it is idle.

"Internal" and chained communication

The router 11 comprises a processor, radio cards and a communication bus with the battery 13, for example a bus according to the RS485 protocol or the like. Thus, the router 11 can interrogate the battery 13 on its state (for example on the current consumption, the remaining charge, the temperature, etc.).

On this principle, the router 11 can also interrogate several chained feeds 13. The battery module, that is to say the housing comprising the battery 13, can go up, via the transmission module, that is to say the box comprising the router 11, information on the remaining battery life of the battery. battery 13, which makes it possible to provide for the replacement of said battery module in an anticipated manner. The power supply and the energy consumption of each element of a device 10 (sensor, radio 12, battery 13) can be controlled by the router 11. The router 11 can thus determine the overall consumption of the device 10.

A transmission protocol based on the Internet Protocol (IP) standard advantageously enables the transport or repatriation in the network R of multimedia video, voice and data streams for various types of applications, for example such as video surveillance. It also allows the connection of different IP cameras or IP encoders connected to analog cameras. The current expansion of IP technology, a standard for digital convergence, has many advantages (very high speed transmission systems, high interoperability, new megapixel cameras, etc.). Thus, the proposed device 10 allows the operation of any IP sensor (camera 33, encoder, recorder, etc.), regardless of the manufacturer, from the moment this sensor uses a TCP / IP or UDP / IP network protocol and its IP address (+ gateway) is configurable. Each IP sensor is connected to the router 11 on a power output thereof. The supply of each IP sensor is managed by the router 11 and provided by a single box comprising a battery 13 or a set of boxes each comprising a battery and connected to the router 11 (Figure 4A, 4B) by chaining. i0 Alarm system Moreover, it is possible to provide an integrated alarm system in at least one of the boxes 1, 2, 3. For example, the alarm system comprises an accelerometer whose measurement made by the latter. This is compared to a threshold value and triggers an alarm based on the result of the comparison. With this feature, users can be warned of an attempted or stolen operation or vandalism.

Location 20 Location information of the devices can be transmitted by the transmission network (R). Location information may be determined for example by network devices (R) at least one of which comprises a GPS module, by triangulation or otherwise. In one embodiment, the transmission of the location information is transmitted by an operated or professional network.

Claims (16)

REVENDICATIONS1. Apparatus (10) for wireless data transmission, comprising: - a router (11), - at least one radio (12), associated with said router (11), - an autonomous power supply source (13), capable of supplying at least the router (11) and the radio (12), - a first housing (1), characterized in that it further comprises: - a second housing (2), in that - the router (11), said radio (12) and said power source (13) are distributed between the first (1) and the second housing (2), and in that - the first housing (1) and the second housing (2) are removably attachable to each other. 2. Device (10) according to claim 1, further comprising a removable attachment system of the first (1) and / or the second housing (2) to a support (20), comprising: - a hooking means flexible and reusable removable member (31) capable of exerting a frictional force on the support (20). Device (10) according to claim 2, wherein the removable attachment system comprises: - a first fastening element (321) and - a second fastening element (322), the first fastening element (321) being secured to the first (1) or second (2) housing, the second securing member (322) being removably attachable to said support (20), the first (321) and second (322) securing members being removably connectable to each other. 4. Device (10) according to claim 2 or 3, wherein the removable attachment system comprises friction elements (31, D), capable of exerting on the support (20) a friction force greater than the force due to the weight of the housing (1, 2) when the housing is hooked to the support (20). 5. Device (10) according to any one of the preceding claims, wherein the first housing (1) and the second housing (2) are removably connectable to each other by magnetization, at least one said first (1) and second housing (2) including at least one magnet (16). 6. Device (10) according to any one of the preceding claims, further comprising a foot (21) through which the first housing (1) and the second housing (2) are hookable to each other . 7. Device (10) according to claim 6, wherein the foot (21) comprises a recess (211) for gripping the device (10). The apparatus (10) of any preceding claim, further comprising at least one sensor (33) coupled to a power output and a data network output of the router (11), wherein the router (11) ) is configured to control the power supply and power consumption of said sensor (33) as well as the data exchange between the router and the sensor (33), the power output and the data network output being able to be the same ( POE). 9. Device (10) according to any one of the preceding claims, further comprising at least a third housing (3), hookable to said first (1) / second housing (2) and comprising either an autonomous power supply source. energy (13, 131) capable of supplying at least said router (11), ie a specific module. 10. Device (10) according to claim 9, comprising a plurality of boxes (1, 2, 3, 4, 5), at least one of which is capable of being hooked to a support (20), said boxes ( 1, 2, 3, 4, 5) being connected in pairs in a detachable manner, connected to an electrical network and possibly to a data network, so that one of said boxes (1, 2, 3, 4, 5) comprises a autonomous power supply source (13, 131) capable of supplying at least the router (11) and the radio (12). 11. Device (10) according to claim 10, comprising a plurality of batteries (13) connected in electrical network and in data network between them and the router (11), wherein each battery has a respective address. The apparatus (10) of any preceding claim, further comprising a remote control configured to control the start / stop of the router (11). Apparatus (10) according to any one of the preceding claims, comprising a first light source, whose operating ignition frequency indicates whether the battery (13) is on and / or charging and / or usage rate, as well as its charge level. Apparatus (10) according to any one of the preceding claims, further comprising a second light source, whose operating ignition frequency depends on the power of the signal received by a given radio (12). A system for wireless data transmission comprising a plurality of devices (10) according to any one of the preceding claims, wherein at least two devices (10) are capable of communicating with each other in a network (R). The system of claim 15, further comprising at least one of the following: at least one gateway for connecting the network (R) formed by said plurality of devices (10), capable of communicating between them, to one or more other infrastructure or access networks (W), - a frequency scanner, - an alarm system integrated in at least one of the boxes - a system for transmitting information from location of the devices.