WO2013186500A1

WO2013186500A1 - Method for sharing antennae, in particular between different communication modules of a communication gateway

Info

Publication number: WO2013186500A1
Application number: PCT/FR2013/051391
Authority: WO
Inventors: Mehdi MOULINE; Jean-Marc Bernex; Ahmed KASTTET; Pierre FOJCIK; Joffrey MAUCOURT; Fath BENMAMAR
Original assignee: Homerider Systems
Priority date: 2012-06-14
Filing date: 2013-06-14
Publication date: 2013-12-19
Also published as: FR2992135A1; FR2992135B1

Abstract

The subject matter of the invention is a method for sharing antennae (40, 42), the use of two antennae (40, 42) for receiving, and optionally also for transmitting, being shared between a plurality of different communication modules (38-1, 38-2, etc.), each communication module (38-1, 38- 2, etc.) being capable of communicating independently on a specific short-range network different from that of another communication module (38-1, 38-2, etc.), the method being characterised in that the sharing of antennae is controlled by a management module (50) carrying out a multiplexing logic function on the two antennae (40, 42). The invention also covers a communication gateway in which the use of two antennae (40, 42) for receiving, and optionally also for transmitting, is shared between a plurality of different communication modules (38-1, 38-2, etc.), using the method of sharing according to the invention.

Description

METHOD OF SHARING ANTENNAS NOTABLY BETWEEN DIFFERENT MODULES OF COMMUNICATION OF A COMMUNICATION GATEWAY

The present invention relates to a communication gateway.

By definition, a communication gateway serves to link different networks because using different frequency bands and / or using different communication protocols.

In an application targeted by the present invention, a communication gateway is used to connect a local area network of measurement devices equipped with low-power and low-range communication means to central information processing systems. central offices being connected to this gateway by a wide area network.

Local measuring devices can be metering devices for electricity consumption, gas, or water equipping particular dwellings in a given geographical area, different dwellings in a collective dwelling, or even different sectors of an industrial site.

These local measurement devices can also be intelligent sensors, making it possible to carry out different readings in relation or not with the measurements of a counting device, such as information relating to the atmospheric conditions: temperature, pressure, etc., or information relating to noise or different pollutions.

There are now on the market a number of counting devices and communicating sensors for remote information retrieval.

Due to certain regulations, these communicating devices use frequency bands dedicated to low-power, short-range radio installations. However, since they are designed by different manufacturers, these communicating devices are often incompatible.

The incompatibility of these different devices is due to the fact that their means of communication use different frequency bands, among those allowed, and / or different communication protocols.

Also, it is necessary to use different communication gateways to be able to collect information from different incompatible measurement devices and disseminated over a geographical area to be covered. This multiplication of the communication gateways results in a multiplication of the communication antennas present in the same geographical area, both to receive the information from the different communicating measuring devices, and to retransmit this information to the central processing systems in the case where the latter link is not f ilaire.

This increase in the number of gateways in the same geographical area is not in the sense of a saving of frequency bands used by communicating measuring devices, which are also used by many other communicating devices. Also, the increase in the number of gateways used for remote information recording contributes to increasing the risks of interference and interference with other communicating devices located in the same geographical area.

In addition, the resulting increase in the number of antennas goes against regulations that tend to limit the number of antennas, especially in urban areas.

Also, to avoid these problems and to use only one communication gateway in a geographical area to cover, a current solution is to limit the use of communicating devices from the same manufacturer.

This is precisely what is currently proposed by some manufacturers: the implementation of a completely developed solution managed by them and encompassing a network of communicating measuring devices, a communication gateway and a data processing system. 'information.

These complete solutions prevent any competition and therefore result in additional costs for the purchase or maintenance of the customers.

In addition, in some contexts, it may be impossible to impose the deployment of such a complete solution, especially with end users wishing to equip themselves at a lower cost or according to their own criteria.

On the other hand, the deployment of a complete solution does not generally offer any possibility of adaptability to the existing one in the case where certain users are already equipped with communicating devices capable of transmitting the desired information but incompatible with the gateway. the deployed solution.

From a general point of view, the frequency bands that can be used by remote data collection systems comprising a network of communicating devices and at least one communication gateway are limited by national or international regulations, for example standards . These regulations are based on the frequency band itself, but also on the duty cycle by time slot, the power of the transmitters, and the type of modulation.

Despite the restrictions imposed by these regulations, the authorized frequency bands are becoming more and more charged, and the growing number of communicating devices is causing collisions on the shared frequency bands.

In addition, some communicating devices and communication bridges do not meet established standards and behave like disrupters, either because they were manufactured without respect for the standards or because they are defective.

Thus, remote data collection systems must accommodate various temporary or background noise disturbances from authorized frequency bands.

In addition, limited transmission ranges of certain communicating devices or limited sensitivities in reception of the communication gateways can also disturb remote data collection.

All these disturbances in the authorized frequency bands give rise to decreases in the traffic of data collected by radio frequencies and more generally to a drop in the quality of the data collection by radiofrequencies.

For example, it is known that, in the presence of disturbances generating a rise in the noise floor, the reception level N of the messages transmitted by radio frequencies tends to rise and the reception rate T of the messages decreases.

This phenomenon is illustrated by the different curves (corresponding to different polling dates) represented in FIG. 6 and showing that in the absence of disturbances, the reception level N of the messages starts at -122 dBm and the reception rate T is high, and in the presence of disturbances, the reception level N rises to -112 dBm while the reception rate T is low.

Of course, companies operating remote radio data collection systems seek to avoid decreases in data traffic due to radio frequency disturbances, these decreases in traffic being detrimental to the quality of the service rendered and degrading the satisfaction of their customers.

The present invention aims to overcome the disadvantages of the prior art.

For this purpose, the subject of the invention is an antenna sharing method, the use in reception, and possibly also in transmission, of two antennas being shared between a plurality of different communication modules, each communication module being capable of to autonomously communicate on a specific short-range network and different from that of another communication module, the method being characterized in that the sharing of antennas is controlled by a management module providing a logic multiplexing function on both antennas.

The invention also covers a communication gateway in which the use in reception, and possibly also in transmission, of two antennas is shared between a plurality of different communication modules using this sharing method.

Advantageously, the present invention proposes in addition to integrate a spectral analysis functionality to the communication gateway.

For this purpose, one of the internal communication modules of the gateway is used as a spectral analysis module making it possible to observe the power of the radio frequency signals received via the reception / transmission means.

The spectral analysis functionality thus integrated into the communication gateway will make it possible to observe and characterize the disturbances of the frequency bands used to communicate with communicating measuring devices, and to consider local or global solutions to improve the quality. remote data collection by the gateway.

Other features and advantages will become apparent from the following description of the invention, a description given by way of example only, with reference to the appended drawings in which: FIG. 1 schematically represents a data collection implemented at the using a communication gateway according to the invention,

FIG. 2 schematically represents message communications using a communication gateway according to the invention,

FIG. 3 diagrammatically represents the internal design of a communication gateway according to the invention,

FIG. 4 diagrammatically represents the means for implementing an antenna multiplexing of a communication gateway according to the invention,

FIG. 5 diagrammatically shows the management of an antenna multiplexing of a communication gateway according to the invention,

FIG. 6 is a graph illustrating the variations in the level of reception of messages transmitted by radio frequencies and the rate of reception of messages in the presence of disturbances causing a rise in the noise floor in a frequency band used by the communication means on the networks. short range of a communication gateway according to the invention,

FIG. 7 is a graph illustrating a spectral analysis of a frequency band that can be performed by the spectral analysis module fitted to a communication gateway according to the invention, FIG. 8 is a graph illustrating sudden increases in the noise floor in a frequency band used by the communication means on the short-range networks of a communication gateway according to the invention, and

FIG. 9 is a graph illustrating a rise in the noise floor as a function of time over a long period of time in a frequency band used by the communication means on the short-range networks of a communication gateway according to the invention.

As illustrated in FIG. 1, the communication gateway 10 according to the invention is intended to connect different communicating measuring devices 12 to a centralized information processing system 14 for performing remote information collection.

As specified in the preamble of the application, depending on the application aimed at, the different measuring devices 12 may be metering devices 16 for electricity consumption, gas or water equipping particular dwellings 20 in a given geographical area, different dwellings in a collective dwelling, or even different sectors of an industrial site, or, these different measuring devices 12 can also be intelligent sensors 18, making it possible to carry out different measurements in relation or not with the measurements of a device counting 16, such as information relating to atmospheric conditions: temperature, pressure, information relating to noise or different pollution, etc. In the configuration provided by the invention, the gateway 10 communicates with each measuring device 12 via a short-range network 22, and with each processing system 14 via an extended network 24.

By extended network 24, the invention means the Internet network.

Preferably, the communication gateway 10 comprises wireless connection means 26 to such an extended network 24.

These wireless connection means 26 may use the standard SM, PRS, ED6E, UMTS, HSDPA, LTE, LTE-Advanced or other.

These wireless connection means 26 take the form of an external antenna 28 and a communication module 30 dedicated to the communication over the wide area network 24.

Alternatively or in addition, the communication gateway 10 may comprise connection means 26 to an extended network 24.

Through its connection means 26 to an extended network 24, the gateway can communicate with different processing systems (14-1,14-2, ...).

Indeed, according to different variants and as illustrated in FIG. 2, a processing system (14-1, 14-3) can be dedicated to the processing of the information collected from the various measuring devices (12-1, 12-4). a single network (22-1,22-4), or a single system of Processing 14-2 can process the information collected from the various measuring devices (12-2,12-3) of different networks (22-2,22-3).

By short-range network 22, the invention is intended to mean a low power network operating on the frequency bands at 433 MHz, 868 MHz or 915 MHz, or any other frequency band authorized for application to the collection of data in a zone. inhabited or industrial.

Each measuring apparatus 12 comprises its own communication means 32 on a short-range network 22, in order to transmit the readings made by its measurement means, and the gateway 10 also comprises communication means 34 dedicated to communication with different apparatuses. measuring 12 on different networks 22 at short range.

Indeed, and as illustrated in FIG. 2, the purpose of the gateway 10 according to the invention is to enable the collection of information coming from heterogeneous measuring devices (12-1, 12-2, ...) as communicating on short-range (22-1,22-2, ...) networks that are different and incompatible.

The incompatibility between these different short-range networks is due to the fact that they use different frequency bands, among those allowed, and / or that they operate according to different communication protocols.

In order to be able to communicate with heterogeneous measuring devices (12-1, 12-2, ...), the communication means 34 of the gateway 10 comprise reception / transmission means 36 and a plurality of internal communication modules ( 38-1,38-2, ...) different, each internal communication module (38-1,38-2, ...) being able to communicate autonomously on a network (22-1,22-2 , ...) at short range specific and different from that of another internal communication module (38-1,38-2, ...).

More specifically, each internal communication module (38-1,38-2, ...) is capable of operating autonomously on a given frequency band and according to a specific protocol.

In a preferred embodiment, substantially corresponding to the diversity of measuring devices 12 on the market, the communication means 34 of the gateway 10 comprise eight internal communication modules (38-1,38-2,38-3,38 -4,38-5,38-6,38-7,38-8) and sharing the use of the receiving / transmitting means 36, as shown schematically in FIG. 3.

In order to be able to adapt the gateway to its environment or to upgrade its capabilities, the internal communication modules 38 take the form of electronic cards removably mounted in the gateway 10 via slots.

Preferably, the communications between the measuring devices (12-1, 12-2, ...) and the gateway 10, and therefore its internal communication modules (38-1, 38-2, ...), are bidirectional. This bi-directionality is useful for the short-range operation of the network (22-1,22-2, ...), for example for synchronization, setting, operation and safety, or when an actuator is coupled to the measuring device.

According to the invention, messages [(Μ1, Μ, ...), (Μ2, Μ2 ', ...), (Μ3, Μ3', ...), (Μ4, Μ4 ', ...) , ...] transferred, in one direction or the other, between the different measuring devices (12-1, 12-2, ...) and the gateway 10 go directly from these measuring devices to the gateway, or indirectly via another measuring device or repeater.

Advantageously, the communications between the gateway 10 and the processing systems (14-1, 14-2, ...) are also bidirectional.

This bidirectionality makes it possible to retransmit instructions to the gateway 10, to carry out updates, to make a remote control for its maintenance, etc.

Coupled with bidirectionality networks (22-1,22-2, ...) at short range, the bidirectionality between the gateway 10 and the processing systems (14-1,14-2, ...) can transfer , in one direction or the other, messages [(Μ1, Μ, ...), (Μ2, Μ2 ', ...), (Μ3, Μ3', ...), (Μ4, Μ4 ') , ...), ...] between one or more predetermined measuring devices (12-1, 12-2, ...) and one or more processing systems (14-1, 14-2, ... ) predetermined.

The gateway 10 according to the invention comprises processing means 44, namely a main processor, managing the operation of its various components, including that of the connection means 26 to an extended network 24 for communication with the processing systems. (14-1, 14-2, ...), and that of the communication means 34 for communication with the measuring devices (12-1, 12-2, ...).

These processing means 44 also manage the operation of other components 46 necessary for the operation of the gateway 10, namely: a random access memory, a read-only memory, a clock, communication ports, different communication channels, a power supply, LEDs, various buttons, as well as other components 48 less essential such atmospheric sensors or other.

According to the invention, the processing means 44 communicate with the internal communication modules (38-1, 38-2, ...) by the use of a single communication channel 45, preferably a synchronous serial bus multiplexed at high speed, with addressing.

Thus, all the communication modules (38-1, 38-2, ...) have access to the same communication channel 45 for transferring the messages to the processing systems (14-1, 14-2, ... ). In this communication, the processing means are the master entity, the communication modules (38-1,38-2, ...) being slaves.

In more detail, the messages [(Μ1, ΜΓ, ...), (Μ2, Μ2 ', ...), (Μ3, Μ3', ...), (Μ4, Μ4 ', ...), ...] coming from the internal communication modules (38-1,38-2, ...) are multiplexed on the communication channel 45 to be stored in a memory 47 of the processing means 44 of the gateway 10 before being retransmitted to the processing system (14-1,14-2, ...) of destination.

If the processing means 44 are unavailable, the internal communication modules 38-1, 38-2,. allowing them to store a minimum of messages [(Μ1, Μ, ...), (Μ2, Μ2 ', ...), (Μ3, Μ3', ...), (Μ4, Μ4 ', ... ), ...] to avoid losing data. Once available, the processing means 44 will receive the messages waiting to empty the buffer memory (49-1,49-2, ...) of each of the internal communication modules (38-1,38-2 ...).

Next, the invention provides that the communications between the gateway 10 and the processing systems (14-1, 14-2, ...) are performed in packets.

Thus, messages [(Μ1, ΜΓ, ...), (Μ2, Μ2 ', ...), (Μ3, Μ3', ...), (Μ4, Μ4 ', ...), .. .] transmitted by different measuring devices (12-1,12-2, ...) and belonging to the same family, ie being intended for the same treatment system (14-1,14- 2, ...), are stored, encapsulated, and concatenated in packets (P1, P2, ...) by the gateway 10.

Advantageously, the packets (P1, P2, ...) thus created may be compressed and encrypted by the gateway 10 before transmission to a predetermined processing system (14-1, 14-2, ...). In addition, messages [(Μ1, Μ, ...), (Μ2, Μ2 ', ...), (Μ3, Μ3', ...), (Μ4, Μ4 ', ...) ,. ..] issued by a processing system (14-1,14-2, ...) to one or more measuring devices (12-1,12-2, ...) can be encapsulated, then conctenated in packets (P1, P2, ...), and optionally compressed and encrypted, before transmission to the gateway 10.

In order to limit the number of antennas of the gateway 10, the reception / transmission means 36 take the form of two antennas (40, 42), preferably external, whose use in reception, and possibly also in transmission, is shared in the internal communication modules (38-1,38-2, ...).

This limitation of the number of antennas and their shared use are made possible in the intended application because the measuring devices transmit (12-1, 12-2, ...) messages at reduced occurrence.

According to the invention, the use of the antennas (40, 42) is shared by means of a sharing method using multiplexing and defining the method of sharing the antenna resources.

For this purpose, the communication means 34 of the gateway 10 comprise a management module 50 of the operation, and in particular the multiplexing, antennas (40,42).

The processing means 44 supervise the operation of the management module 50 of the operation of the antennas (40, 42).

Each antenna (40, 42) of the reception / transmission means 36 is amplified in reception, as in transmission, by means of amplifiers (40 ', 42') arranged at the base of these antennas (40, 42). This amplification in foot allows to reduce the power consumption of the internal communication modules (38-1,38-2, ...), to compensate the losses in the different electrical connections, and especially those due to the multiplexing, and to ensure better signal quality.

The operation of these amplifiers (40 ', 42') is also managed by the management module 50 of the operation of the antennas (40,42).

Thus, switching between the operation of transmitting or receiving, or stopping, antennas (40,42) is performed directly by the power supply of the amplifiers (40 ', 42') managed by the management module 50.

As shown in FIG. 4 for a single antenna 40, and in order to perform the multiplexing of the antennas, each antenna (40, 42) is connected to all the internal communication modules (38-1, 38-2, .. .) by a network (52,52 ') of dividers / combiners (54,54', ...) of power.

Of course, each amplifier (40 ', 42') is interposed between the antenna (40,42) and the network (52,52 ') of dividers / combiners 54 corresponding.

In the preferred embodiment in which the communication means 34 of the gateway 10 comprise eight internal communication modules (38-1,38-2, ...), for each antenna (40,42), and ranging from an antenna (40,42) to the modules (38-1,38-2, ...), the network (52,52 ') comprises a first divider / combiner 54 connected to two dividers / combiners 54' each connected to two dividers / combiners 54 ", the last four dividers / combiners 54" being each connected to two internal communication modules (38-1,38-2, ...).

In order to select the use of one of the two antennas (40,42), a switch (56-1,56-2, ...) is interposed between each internal communication module (38-1,38-2, ...) and the two networks (52,52 ') of divisors / combiners (54,54', ...) to which it is connected.

The operation of the switches (56-1, 56-2, ...) is also controlled by the management module 50 in order to operate the selection of antennas (40, 42) defined by the antenna sharing method according to the invention.

According to the invention, the sharing of antennas is controlled by the management module 50 which provides the multiplexing logic function on the two antennas (40,42).

This management module 50 may take the form of a programmable logic circuit or a dedicated processor, the choice of technology depending on the switching time required for the intended application and the number of communication modules (38-1). , 38-2, ...) to manage.

In the antenna sharing method according to the invention, each internal communication module (38-1,38-2, ...) requests the management module 50 to transmit or receive on the first antenna 40 or on the second antenna 42 via logic signals.

As illustrated in FIG. 5, each communication module (38-1, 38-2, ...) has two request signals: an antenna signal (ANT-1, ANT-2, ...) corresponding to the antenna choice, and a direction signal (DIR-1, DIR-2, ...) corresponding to the direction of transmission or reception depending on whether the module wants to transmit or receive.

The management module 50 receives as input the request signals (ANT-1, ANT-2, ...) and (DIR-1, DIR-2, ...) coming from the communication modules (38-1,38 -2, ...) and decides according to preestablished rules which communication module (38-1,38-2, ...) is allowed to be connected to which antenna (40,42).

According to a first rule of the sharing method according to the invention, the management module 50 authorizes the transmission of data to a single communication module (38-1,38-2, ...) at a time.

This transmission authorization is transmitted to the module (38-1,38-2, ...) selected via an authorization signal (EDIR-1, EDIR-2, ...).

According to a second rule of the sharing method, the first communication module (38-1,38- 2, ...) that requests the transmission access blocks the request of the other modules (38-1,38-2, ... ) who must wait until the end of the current program.

For this purpose, when a communication module (38-1,38-2, ...) transmits, the management module 50 transmits an RXTX control signal to all the other modules (38-1,38-2, ...) indicating that an emission is in progress and that any action on the antenna (40,42) used in transmission is suspended.

Also, when a communication module (38-1,38-2, ...) transmits by a first antenna (40,42), the management module 50 routes the other communication modules (38-1,38- 2, ...), especially in reception, to the second antenna (40,42).

In the case where several communication modules (38-1,38-2, ...) request to transmit, a priority law is applied.

According to this priority law, equivalent to a logical priority encoding, when at least one direction signal (DIR-1, DIR-2, ...) is activated, the management module 50 checks the signals (DIR-1, DIR-2, ...) from first to last, and gives priority to the corresponding communication module (38-1,38-2, ...) in that order.

Also, once the authorized emission to a module (38-1,38-2, ...) on an antenna, it keeps it until the end of the transmission, and the transmission requests of others modules on this antenna remain blocked until the end of transmission.

The highest priority communication module (38-1,38-2, ...) is only authorized by the management module 50 to be transmitted.

However, given the reaction time of the electronic components of the gateway 10 and the low occurrence of the messages passing over the short-range networks in the targeted application, the priority law only applies in the exceptional cases of simultaneity of the request. .

More generally, and according to a third rule of the sharing method, when a communication module (38-1,38-2, ...) is informed that a transmission is in progress, it does not ask transmit at the same time. This prevents the management module 50 handling requests unnecessarily.

According to a fourth rule of the sharing method according to the invention, when all the communication modules (38-1,38-2, ...) are in reception, which is the general case, each communication module (38- 1.38-2, ...) is connected by the management module 50 to the antenna (40.42) of its choice.

Thus, the communication modules (38-1,38-2, ...) can freely switch from one antenna (40,42) to another to increase the chances of receiving messages.

For the same purpose, it can be expected to equip the gateway 10 according to the invention with antennas (40,42) with different characteristics or differently oriented. According to a fifth rule of the sharing method according to the invention, it is expected to count the cumulative emission time of each communication module (38-1,38-2, ...).

The transmission time of each communication module (38-1,38-2, ...) is controlled in order to obtain an equitable sharing of the antennas (40,42) and to avoid any risk of transmission blocking. Also, a communication module (38-1,38-2, ...) can be prohibited from sending, if:

it does not finish sending its message at the end of a time set as a parameter in the management module 50,

it exceeds a maximum time of use of the antennas (40, 42) in transmission per time slot, or

- more generally, if the module does not comply with predefined criteria for the use of transmit antennas, such as a transmission rate predefined by a standard, such as EC7003 "Duty Cycle Categories" recommendation, on a frequency band during a time slot of one hour.

Of course, if its transmission request is canceled, after a certain waiting time, or once the internal communication module prohibits transmission meets new criteria, it can again be authorized to transmit.

In order to connect each communication module (38-1,38-2, ...) to the antenna (40,42) chosen from the preceding rules, the management module 50 controls the operation of the switches (56-1). , 56-2, ...) and antenna amplifiers (40 ', 42').

The management module 50 controls the switches (56-1,56-2, ...) using a control signal (CTRL-1, CTRL-2, ...) and a signal of reverse control (CTRL-l ', CTRL-2', ...).

In addition, the management module 50 controls the mode of operation: transmission, reception or stop of the amplifiers (40 ', 42') by their power supply, the amplifiers (40 ', 42') receiving different supply potentials (V1, V2, V3) which put them out of service (VI, for example OV), in reception (V2, for example 3V) or in transmission (V3, for example 5V). For this purpose, the management module 50 uses three signals controlling the operation of the power supplies of the amplifiers (40 ', 42'): first power supply signals VA and VB serving respectively to put the power supply of the power supply on or off. 40 'of the antenna 40 and the amplifier 42' of the antenna 42, and the control signal XTX for controlling the supply potential (V1, V2, V3) of each amplifier (40 ', 42 ').

In addition to controlling the correct sharing of the antennas (40,42), the management module 50 reports to the processing means 44 of the gateway 10 the information on the operation of the multiplexing. Thus, the processing means 44 can know which is the communication module (38-1,38-2, ...) in transmission and prevent any case of malfunction.

By means of a synchronous channel 58, the processing means 44 can communicate with the management module 50 and know its state, anchor tests, reload the software of the management module 50 or send information relating to the use limits in transmission. .

In addition to the internal communication modules (38-1,38-2, ...), the gateway 10 may include external modules (60-1,60-2, ...) of communication to extend its communication capabilities on networks (22-1,22-2, ...) at short range.

These external modules (60-1,60-2, ...) communication are connected to the gateway 10 via external ports 62, including USB type. The use of these external modules (60-1,60-2, ...) communication for the transmission of messages is managed by the processing means 44.

In addition, the communication gateway 10 can also integrate a spectral analysis function in order to observe the frequency bands used to communicate with the communicating measuring instruments, the objectives of this observation being to characterize the disturbances of these frequency bands. , and apply local or global solutions to improve the quality of remote data collection.

For the integration of this spectral analysis function, one of the internal communication modules (38-1,38-2, ...) is used as a spectral analysis module 64 for observing the power of the radiofrequency signals. received via the receiving / transmitting means 36 of the gateway 10, as illustrated in FIGS. 1, 3 and 4.

In order to be used as a spectral analysis module 64, the selected internal communication module (38-1, 38-2, ...) is put into service thanks to a specific parameterization adapting its operation to the implementation. of this spectral analysis function.

According to the invention, the spectral analysis module 64 and the other internal communication modules (38-1,38-2, ...) share the use of the reception / transmission means 36 formed by the two antennas ( 40,42).

In the case where the gateway 10 also includes external modules (60-1,60-2, ...) communication to extend its communication capabilities on networks (22-1,22-2, ...) to short range, the spectral analysis module 64 and these external modules (60-1,60-2, ...) of communication also share the use of the reception / transmission means 36 formed by the two antennas (40, 42).

Optionally, one of the external communication modules (60-1,60-2, ...) is used as a spectral analysis module (64) in place of an internal module (38-1,38). 2, ...), as shown in Figure 3.

As it takes the form of one of the internal (38-1,38-2, ...) or external (60-1,60-2, ...) communication modules, the spectral analysis module 64 uses the same radiofrequency signals as the other modules.

Indeed, the spectral analysis module 64 is connected to the antennas (40,42) by the same networks (52,52 ') of dividers / combiners (54,54', ...) of power that the other modules of communication.

In addition, the operation of the spectral analysis module 64 is supervised by the same processing means 44 which manage the operation of the other components of the gateway 10 including the other communication modules.

And, the sharing of the antenna resources (40,42) by multiplexing between the spectral analysis module 64 and the other communication modules is also controlled by the management module 50 of the communication means 34.

Consequently, the spectral analysis module 64 follows the same rules for sharing the antenna resources as the other communication modules, with the only difference that the spectral analysis module 64 only functions in reception and does not need to be connected. access to transmit antennas (40,42) like the other communication modules.

In addition, the spectral analysis module 64 is programmed to operate on an antenna (40,42) for each measurement cycle, the choice of antenna being modifiable by command: either one or the other, or the two in the middle.

Advantageously, during each measurement cycle performed by the spectral analysis module 64, information identifying the antenna (40, 42) used is associated with the measurements made.

Instead of collecting messages [(Μ1, Μ, ...), (Μ2, Μ2 ', ...), (Μ3, Μ3', ...), (Μ4, Μ4 ', ...), ...] transmitted by the different measuring devices (12-1, 12-2, ...) like the other communication modules of the gateway 10, the spectral analysis module 64 performs power measurements of the radiofrequency signals. sequences picked up by one of the antennas (40,42).

In more detail, the spectral analysis module 64 measures the power of the radiofrequency signals picked up by one of the antennas (40, 42) in each frequency band (B1, B2, ...) used by the various modules of the spectrum. internal communications (38-1,38-2, ...) and external (60-1,60-2, ...) communication means 34 of the bridge. Advantageously, the spectral analysis module 64 measures all the radio frequency signals present in the frequency bands used by the various internal (38-1,38-2, ...) and external (60-1,60-2, ...).

In a preferred embodiment, the spectral analysis module 64 performs the power measurements of the radiofrequency signals by scanning each frequency band (BF1, BF2, ...) in frequency steps, for example in steps of 0.1 MHz. .

The graph in FIG. 7 illustrates a spectral analysis that can be performed by the spectral analysis module 64 in a frequency band (BF1, BF2,...) Ranging between 863 MHz and 873 MHz and in steps of 0.1. MHz.

The power measurements accumulated by the spectral analysis module 64 for one minute are displayed in the form of two curves (C1, C2) indicating the power P of the radio frequency signals, in decibels (dBm) and respectively in average value and in value. maximum, for each frequency step f of 0.1 MHz.

Advantageously, the difference between the average curve C1 and the maximum curve C2 provides statistical information on the duration of the disturbances: a small difference signifying a long disturbance, and a large difference being characteristic of a short disturbance. According to the invention, the frequential measurement scan is repeated by the spectral analysis module 64 for each frequency band used by the communication means 34 according to a time interval shorter than the transmission duration of the messages [(Μ1 , ΜΓ, ...), (Μ2, Μ2 ', ...), (Μ3, Μ3', ...), (Μ4, Μ4 ', ...), ...] exchanged between the devices of measurement 12 and the communication means 34 of the gateway 10.

As for example by means of the average curves C1 and maximum C2, by means of the power measurements of the radiofrequency signals that it carries out, the spectral analysis module 64 enables the gateway 10 to collect statistical information (IS1, IS2 , ...) on the use of each frequency band (BF1, BF2, ...) used by the communication means 34.

By statistical information (IS1, IS2, ...), the invention hears the raw or pre-analyzed results of the power measurements made by the spectral analysis module 64 in the different frequency bands (BF1, BF2, .. .).

Advantageously, the statistical information (IS1, IS2, etc.) also contains the identification of the antenna (40, 42) used for each power measurement cycle performed by the spectral analysis module 64.

This statistical information (IS1, IS2, ...) on the use of each frequency band (BF1, BF2, ...) are stored by the gateway 10 before being exploited locally by the gateway 10 and its means of 44, or before being transmitted to a remote system, such as a processing system (14-1,14-2, ...), which will exploit them. Like the messages [(Μ1, Μ, ...), (Μ2, Μ2 ', ...), (Μ3, Μ3', ...), (Μ4, Μ4 ', ...), ... ], this statistical information (IS1, IS2, ...) can be stored in a memory 47 of the processing means 44 of the gateway 10 before being exploited by these processing means 44, or before being retransmitted to the remote system , such a treatment system (14-1,14-2, ...), which will exploit them.

Advantageously, the internal (38-1,38-2, ...) or external (60-1,60-2, ...) communication module used as spectral analysis module 64 has a buffer memory ( 49-1,49-2, ...) allowing it to store a minimum of statistical information (IS1, IS2, ...), for example in order to wait for the availability of the processing means 44 or the retransmission of statistical information (IS1, IS2, ...) to a remote system.

Each statistical information (IS1, IS2, ...) can be transmitted for operation to the processing system (14-1, 14-2, ...) in relation with the internal module (s) (38). -1,38-2, ...) or external (60-1,60-2, ...) communication working on the frequency band (BF1, BF2, ...) concerned.

Alternatively or in addition, and as illustrated in FIG. 2, statistical information (IS1, IS2, ...) relating to a frequency band (BF1, BF2,...) Can be retransmitted to a supervision system 66 used to remotely supervise the communications between the gateway 10 and the different measuring devices 12 via the short-range network 22 concerned.

For transmission to a processing system (14-1, 14-2, ...) or to a supervision system 66 of a short-range network 22, the statistical information (IS1, IS2, ... ) relating to each frequency band (BF1, BF2, ...) can be stored, encapsulated, then concaed into packets (P1, P2, ...) individually, with several, or with the messages [(M1, M1 ', ...), (M2, M2', ...), (M3, M3 ', ...), (M4, M4', ...), ...] harvested by the other modules Communication.

In a preferred operating mode, the statistical information (IS1, IS2, ...) relating to each frequency band (BF1, BF2, ...) is transmitted to a processing center or to a supervision system 66 at regular intervals. , for example every minute.

Locally by the gateway 10 or remotely by a processing system (14-1,14-2, ...) or a supervision system 66, the exploitation of the statistical information (IS1, IS2, ...) collected by the spectral analysis module 64 makes it possible to identify disturbances such as a rise in ambient noise, permanent or temporary, in one of the frequency bands (BF1, BF2,...) used by the communication means 34 of the gateway 10 , and / or as an overload of use of one of these frequency bands (BF1, BF2, ...) used by the communication means 34.

In the event of identification of a rise in ambient noise and / or an overload in the frequency bands (BF1, BF2, ...) used by the communication means 34 of the gateway 10, corrective actions on the use of the frequency bands (BF1, BF2, ...) by the communication means 34 are \ ancées to overcome the disturbance (s) detected (s), and to restore the quality data collection carried out on short-range networks. The corrective actions on the use of the frequency bands (BF1, BF2, ...) are anchored by the gateway 10 or from a processing system center (14-1, 14-2,. supervision system 66.

The response time between the detection of a rise in ambient noise and / or overload and the initiation of a corrective action depends on the service rendered.

For example, in the case of the meter reading of consumption meters, the response time will be less than the week.

In other cases, this response time may be lower, the speed of the intervention, and for example decision making of a supervision system 66, depending on the urgency of the information collected and the frequency these information statements.

Generally, if the expected response time is short, the gateway 10 will be programmed to \ anchor the corrective action, and if the expected response time is longer, the corrective action will be initiated from a processing system (14-1). , 14-2, ...) or a supervision system 66.

Preferably, the supervisory system 66 knowing the structure of the wide area network 24 connecting it to the gateway 10 and that of the different networks 22 at short range, this monitoring system 66 uses the results of the spectral analysis to make the decisions relating to the corrective actions to \ anchor.

According to a first example, in the case of a geographical area covered by different communication gateways 10, the supervision system 66 can envisage, permanently or temporarily, a routing of the statistical information (IS1, IS2,. another communication gateway 10 that a gateway 10 is located in a busy area, in order to avoid losing information.

According to another example, the supervision system 66 can decide on a reprogramming of different communicating measuring devices 12, the reprogramming being transmitted back to the devices 12 concerned via the communication gateway 10.

However, in any case, the operator of a short-range network 22 seeks to detect the problem before having an impact on the data collection.

A temporary rise in ambient noise is generally due to an intentional or occasional disturbance in the frequency band (BF1, BF2, ...) considered.

As illustrated in FIG. 8, in a frequency band (BF1, BF2, ...) considered, an intentional or occasional disturbance causes sudden increases (1, 2, 3, 4, ...) of the noise floor B , measured by the spectral analysis module 64, which are repeated over time t. Also, in order to identify the presence of one or more disturbers in the frequency band (BF1, BF2, ...) considered, the statistical information (IS1, IS2, ...) collected by the module of Spectral analysis 64 are used to count the number of sudden increases (R1, R2, R3, R4, ...) of signal higher than a predetermined threshold SI, lasting for a duration greater than a detection time D, and reproducing after a delay less than a no detection period N.

When the counting of these sudden increases (R1, R2, R3, R4, ...) of signal in the frequency band (BF1, BF2, ...) considered has made it possible to identify a disrupter, a warning signal is created.

According to the mode of operation chosen, the alert signal relating to the identification of a disturbance in a determined frequency band (BF1, BF2, ...) is directly processed by the gateway 10 or retransmitted to a processing system ( 14-1, 14-2, ...) or a supervision system 66.

For example, in the case of a transmitter identified as parasitic in the reception area of the gateway 10, an emitter being considered as parasitic as soon as it raises the reception threshold of the gateway 10 and it does not does not respect the duty cycle for each time slot and the transmission power allowed in one of the frequency bands (BF1, BF2, ...), a corrective action is to track the parasitic transmitter to stop its program.

Most often, the elimination of the parasitic transmitter from the reception area of the gateway 10 is obtained by a physical deletion of this transmitter.

From the point of view of the gateway 10, an overload of use of one of the frequency bands (BF1, BF2, ...) used by the communication means 34 corresponds to a level of noise floor lying above the radio frequency sensitivity of the communication module of the gateway 10 working in the frequency band (BF1, BF2, ...) considered, or a significant activity due to a large data traffic in the frequency band (BF1, BF2 , ...) considered.

As illustrated by FIG. 9 representing in time the mean level of detected signal S and the average MS of this signal with respect to noise floor B, a noise floor B that is too high or an excessive activity in the frequency band ( BF1, BF2, ...), result in a rise of the noise floor B over a long duration and in a radio frequency sensitivity likely to hinder the reception of messages [(Μ1, ΜΓ, ...), (Μ2, Μ2 ', ...), (Μ3, Μ3', ...), (Μ4, Μ4 ', ...), ...] by the communication means 34.

In order to identify a noise floor that is too high or too much activity in the frequency band (BF1, BF2, ...) considered, the statistical information (IS1, IS2, ...) collected by the analysis module 64 are used to analyze the noise floor B measured by the spectral analysis module 64 by means of a running average over a period of time. DD detection sufficiently long in time t for carrying out a significant analysis, and for example greater than two hours.

Indeed, the data transmission by the communicating measuring devices 12 is generally evenly distributed over twenty-four hours, and the loss of traffic due to the ambient noise generated by certain parasitic emitters is detectable only by an observation on twenty-four hours. four hours.

However, some parasitic transmitters

20 to 50% less nominal traffic than for one or two hours at most, knowing that a nominal 50% drop in traffic for one hour represents about 2% of overall loss if the changeover period of the information is 24 hours.

Of course, such temporary decreases in traffic can be offset by a redundancy of the messages transmitted by the communicating measuring devices 12, but only within a certain limit, variable as the case may be, in order to avoid creating new disturbances.

The distinction between a noise floor that is too high or an activity that is too important in the frequency band (BF1, BF2, ...) considered is performed by correlating the reception rate T of the messages [(Μ1, Μ, ...) , (Μ2, Μ2 ', ...), (Μ3, Μ3', ...), (Μ4, Μ4 ', ...), ...] exchanged in † the communication means 34 of the gateway 10 and the measuring devices 12 with the noise floor B measured by the spectral analysis module 64 in the frequency band (BF1, BF2, ...) considered. If the reception rate T is low, the disturbance is attributable to the traffic of other transmitters: it is an external saturation.

If the reception rate T is high, the disturbance is attributable to the traffic on the frequency band (BF1, BF2, ...) considered itself, and therefore on the corresponding short-range network 22: it is a self- saturation related to the number of collisions between the messages [(Μ1, Μ, ...), (Μ2, Μ2 ', ...), (Μ3, Μ3', ...), (Μ4, Μ4 ', .. .), ...] exchanged in the communication means 34 of the gateway 10 and the measuring devices 12.

For example, in the case of external saturation, a rise of 6 dB of the noise floor B is equivalent to a loss of 50 to 75% of the data transmitted by the messages [(Μ1, Μ, ... ), (Μ2, Μ2 ', ...), (Μ3, Μ3', ...), (Μ4, Μ4 ', ...), ...] exchanged in the means of communication 34 of the gateway 10 and measuring devices 12.

In the case of a self-saturation of a frequency band, a corrective action to deal with such long-term disturbances may consist in limiting the sensitivity of the reception means of the communication modules of the gateway 10, and consequently its range of action. Alternatively, another corrective action to overcome such long-term disturbances may be to reduce the power of the transmitting means of the communication modules of the gateway 10 and measuring devices 12.

Or, another corrective action may consist in reprogramming the operation of the transmission means of the communication modules of the gateway 10 and the measuring devices 12 on other frequency channels, or on other frequency bands.

In any case, and although either of these corrective actions has been initiated, the number of gateways 10 must be adapted to the population of measuring devices 12 in the area to be covered. When the sliding average analysis of the noise floor B measured by the spectral analysis module 64 in the frequency band (BF1, BF2, ...) considered has made it possible to identify a noise floor that is too high or an activity too important in the frequency band (BF1, BF2, ...) considered, an alert signal is created.

Depending on the procedure chosen, the warning signal relating to the identification of a floor of too high noise or excessive activity in the frequency band (BF1, BF2, ...) considered is directly processed by the gateway 10 or retransmitted to a processing system (14- 1, 14-2, ...) or a supervision system 66.

In a general manner, in the present invention, and whatever the disturbances detected in the frequency bands (BF1, BF2, ...) used by the communication means 34 of the gateway 10, the statistical information (IS1, IS2, ...) are used to improve the use of the frequency bands (BF1, BF2, ...).

For example, the use of the frequency bands (BF1, BF2, ...) can be improved by modifying the communication protocols between the gateway 10 and the different measuring devices 12 on the networks 22 at short range.

In another example, the different measuring devices 12 and the communication modules of the gateway 10 can be reprogrammed so as to use another type of modulation less sensitive to the type of disturbance generated.

Advantageously, the statistical information (IS1, IS2, ...) collected by the spectral analysis module 64 is used by a processing system (14-1, 14-2, ...) or a supervision system 66 for to remotely diagnose the operation, and in particular the sharing, of the communication means 34 of the gateway 10, as well as the operation of the other internal modules (38-1, 38-2, ...), and possibly external modules (60 -1,60-2, ...), of the gateway 10 which are not used as spectral analysis module 64.

Claims

An antenna sharing method (40,42), the use in reception, and possibly also in transmission, of two antennas (40,42) being shared between a plurality of communication modules (38-1,38). 2, ...) different, each communication module (38-1,38- 2, ...) being able to communicate autonomously on a network (22-1,22-2, ...) short specific scope and different from that of another communication module (38-1,38-2, ...), the method being characterized in that the sharing of antennas is controlled by a management module (50) providing a logic multiplexing function on both antennas (40,42).

An antenna sharing method (40,42) according to claim 1, wherein each internal communication module (38-1,38-2, ...) requesting the management module (50) to transmit or receive receiving on the first antenna (40) or the second antenna (42) via logic signals, each communication module (38-1,38-2, ...) having two request signals: a signal antenna (ANT-1, ANT-2, ...) corresponding to the choice of antenna, and a direction signal (DIR-1, DIR-2, ...) corresponding to the transmission or reception direction depending on whether the module wishes to transmit or receive, the management module (50) receives as input the request signals (ANT-1, ANT-2, ...) and (DIR-1, DIR-2, ...) coming from the modules communication device (38-1,38-2, ...) and decides according to preestablished rules which communication module (38-1,38-2, ...) is allowed to be connected to which antenna (40, 42).

An antenna sharing method (40, 42) according to claim 2, wherein the management module (50) allows the transmission of data to a single communication module (38-138-2, .. .) at the same time, this transmission authorization being transmitted to the selected module (38-1,38-2, ...) via an authorization signal (EDIR-1, EDIR-2,. ..).

An antenna sharing method (40,42) as claimed in claim 2 or claim 3, wherein the first communication module (38-1,38-2, ...) requesting broadcast access blocks the request. other modules (38-1,38-2, ...) which must wait for the end of the current transmission, the management module (50) transmitting, when a communication module (38-1,38- 2, ...) transmits a control signal (RXTX) to all the other modules (38-1,38-2, ...) indicating that a transmission is in progress and that any action on the antenna (40,42) used in transmission is suspended.

An antenna sharing method (40,42) according to one of claims 2 to 4, wherein, in the case where several communication modules (38-1,38-2, ...) request to transmit , a priority law is applied, the highest priority communication module (38-1,38-2, ...) being alone authorized by the management module (50) to be transmitted.

An antenna sharing method (40,42) according to one of claims 2 to 5, wherein, when a communication module (38-1,38-2, ...) is informed that a emission is in progress, it does not ask to transmit at the same time.

An antenna sharing method (40,42) according to one of claims 2 to 6, wherein when all the communication modules (38-1,38-2, ...) are in reception, each module communication (38-1,38-2, ...) is connected by the management module (50) to the antenna (40,42) of his choice.

An antenna sharing method (40,42) according to one of claims 2 to 7, wherein it is expected to count the cumulative transmission time of each communication module (38-1,38-2, ...), the transmission time of each communication module (38-1,38-2, ...) being controlled in order to obtain an equitable sharing of the antennas (40,42) and to avoid any risk blocking transmission.

9. An antenna sharing method (40,42) according to one of claims 2 to 8, wherein a communication module (38-1,38-2, ...) can be prohibited transmission, if :

it does not finish sending its message at the end of a time set as a parameter in the management module (50),

it exceeds a maximum time of use of the antennas (40,42) in emission per time slot, or

if the module does not meet predetermined criteria for the use of transmit antennas.

An antenna sharing method (40,42) according to one of claims 2 to 9, wherein, each antenna (40,42) being connected to all the internal communication modules (38-1,38-2). , ...) by a network (52, 52 ') of dividers / combiners (54, 54', ...) of power, a switch (56-1, 56-2, ...) being interposed between each internal communication module (38- 1.38-2, ...) and the two networks (52, 52 ') of dividers / combiners (54.54', ...) to which it is connected, and each antenna ( 40,42) being amplified in reception as in transmission by amplifiers (40 ', 42') arranged at the base of these antennas (40,42), the management module (50) controls the operation of the switches (56-1). , 56-2, ...) and antenna amplifiers (40 ', 42') for connecting each communication module (38-1,38-2, ...) to the antenna (40 , 42) selected, the management module (50) controlling the switches (56-1,56-2, ...) by means of a control signal (CTRL-1, CTRL-2, ... ) and a sign reverse control al (CTRL-l ', CTRL-2', ...), and the management module (50) controlling the mode of operation: transmission, reception or stop of the amplifiers (40 ', 42') by their power supply.

An antenna sharing method (40,42) according to claim 10, wherein the amplifiers (40 ', 42') receive different supply potentials (V1, V2, V3) which disable them (VI, for example OV), in reception (V2, for example 3V) or in transmission (V3, for example 5V), the management module (50) using three signals controlling the operation of the power supplies of the amplifiers (40 ', 42'): first power supply signals (VA) and (VB) respectively for switching on or off the power supply of the amplifier (40 ') of the antenna (40) and the amplifier (42') of the antenna (42), and a control signal (XTX) for controlling the supply potential (V1, V2, V3) of each amplifier (40 ', 42').

12. Communication gateway (10) in which the use in reception, and possibly also in transmission, of two antennas (40,42) is shared between a plurality of communication modules (38-1,38-2, .. .) different by the sharing method according to one of claims 1 to 11.