WO2016001316A1

WO2016001316A1 - Method of transferring a sensor measuring data-related communication between two access nodes of a communication network

Info

Publication number: WO2016001316A1
Application number: PCT/EP2015/065009
Authority: WO
Inventors: Michal Krzysztof SZCZERBAK
Original assignee: Predicsis
Priority date: 2014-07-03
Filing date: 2015-07-01
Publication date: 2016-01-07
Also published as: FR3023442B1; FR3023442A1

Abstract

The invention relates to a transfer method for transferring a data communication from a first radio communication link (L1), between a measuring sensor (40) and a first node (10) giving access to a communication network (5), to a second communication link (L2), between the measuring sensor (40) and a second node (20) giving access to the communication network (5), the data relating to measurements carried out by the sensor (40). The method is characterized in that the first access node (10) and the second access node (20) are linked to a management server (30) via the communication network (5) and the method comprises a receiving step, in which the management server (30) receives an information message sent by the first access node (10), the information message comprising information concerning the state of the first access node (10) and/or a data communication transfer request, and a step in which the management server (30) sends to the second access node (20) a request for communication to be established with the measuring sensor (40), following the information message received.

Description

METHOD FOR TRANSFERRING COMMUNICATION RELATING TO SENSOR MEASUREMENT DATA BETWEEN TWO ACCESS NODES OF A COMMUNICATION NETWORK

TECHNICAL FIELD AND OBJECT OF THE INVENTION

The present invention relates to the field of the Internet of Things and more particularly concerns a method and a server for managing a communication between a measurement sensor and an access node to a communication network as well as a sensor of measure and an access node.

The invention enables the transfer of a data communication, transmitted by a measurement sensor, from a first node to a second access node to a communication network. STATE OF THE ART

In the field of communication networks, it is known to use so-called "connected" measurement sensors, also called "connected objects", which transmit signals on a radio communication link destined for one or more communication nodes. access to a communication network such as, for example, the Internet.

These sensors can be fixed or mobile and are configured to measure values of one or more parameters such as, for example, a user's heart rate or blood pressure, a temperature, a humidity level, etc. signals are transmitted over a radio communication link using such a protocol known Bluetooth ^® kind, WiFi, Zigbee ... and include application data on the measures they have taken.

For example, a connected object may be a so-called "smart" watch, a bracelet, a camera, a heart rate monitor, a smartphone, a tablet, a management module of a household appliance, etc. Similarly, an access node may be, for example, a user equipment of smartphone, computer, tablet or any other device adapted to communicate with a sensor connected in the purpose of receiving signals from it, comprising application data relating to measurements made by said sensor to perform a service.

For this purpose, the sensor and the access node first establish a radio communication link in a known manner during a so-called "discovery" stage and then, once connected, the sensor sends the data to the access node on said radio communication link. An access node that receives these signals can transfer, via the communication network, the application data they contain to an operating server of the service associated with the data, which can then store them and / or exploit them in the context said service. In a variant, the access node can store and / or exploit the application data itself as part of a service. This type of system is known in the Internet of Things. For example, there is known a medical service for analyzing the heart rate of a user. The user wears a sensor that measures his heart rate and transmits it on a Bluetooth * type radio communication link to his smartphone. The application relating to the service is either installed on the smartphone or on an operating server connected to the smartphone via a communication network. In the first case, the application analyzes the data locally on the smartphone. In the second case, the smartphone transfers the data to the operating server which analyzes them. When the application detects an abnormality in the user's heart rate measurements, the smartphone (in the first case) or the application server (in the second case) triggers an alert with the help that may occur.

In this type of system, a problem arises when the power supply reserve of a first access node, which is in communication with a measurement sensor on a first radio communication link, decreases below one. predetermined threshold or that the signal strength used by a first access node to communicate data, received from a measurement sensor on a first radio communication link, through a communication network decreases below a threshold predetermined or even when a first access node leaves the radio coverage of a measurement sensor from which it receives data on a first radio communication link. In this case, it is desirable or necessary to establish a communication on a second radio communication link with a second access node so that the sensor can continue to transmit its application data. Of known manner, this mechanism is called a communication (handover) in English language.

An existing solution, described in patent application US 2010/0285807 A1, makes it possible to carry out the transfer of a data communication, sent by a sensor to a first access node, to a second access node. This solution, however, has many disadvantages.

First, this solution requires the simultaneous presence of the first access node and the second access node to perform the transfer of the communication. Then, in this solution, the access nodes can only receive and possibly transfer the data but can not improve the use that is made of it. In addition, it is necessary that all the access nodes of the network monitor the first radio communication link to be able to establish a second radio communication link with the sensor if necessary, which requires a high electrical energy consumption and present therefore a significant disadvantage. In addition, the communication transfer described in this solution requires a constant exchange of information between the first access node, the second access node and the sensor, which leads to a significant consumption of resources, particularly energy, of the part of the sensor and the access nodes involved in this transfer. Finally, this existing solution does not allow the same access node to manage data communication transfers from sensors of different types such as, for example, mobile sensors carried by a user and fixed sensors located in a house. or in a motor vehicle.

The invention therefore aims at solving at least partially these disadvantages by proposing a simple, reliable and efficient solution for carrying out a data communication transfer, sent by a connected sensor, from a first access node to a second node. access to a communication network.

GENERAL PRESENTATION OF THE INVENTION

For this purpose, the subject of the invention is a method for transferring a data communication of a first radio communication link, between a measurement sensor and a first node of access to a communication network, to a second radio communication link, between said measurement sensor and a second access node to said communication network, the data relating to measurements made by the sensor, said method being remarkable in that, the first access node and the second access node being connected to a management server via the communication network, the method comprises the steps of:

receiving, by said management server, an information message sent by the first access node, said information message comprising information on the state of said first access node and / or a transfer request; data communication, and

sending, by the management server, to the second access node a request to establish a communication with the measurement sensor following the received information message. By the term "information on the state of the first access node" is meant information on the quality of the signal received from the network by said first access node (particularly when the first access node connects to the network on the network). a radio communication link) and / or information on the level of charge of the power supply of the first access node and / or information on the presence of the first access node in the radio coverage of a radio sensor. measured.

The information message can be sent periodically, for example a few tenths of seconds or a few seconds, especially when it comprises information on the state of the first access node, or aperiodically, especially when the message of information includes a request to transfer the data communication.

The communication transfer is thus advantageously managed remotely by a management server connected to both the first access node and the second access node by the communication network. It is therefore not necessary to have the simultaneous and continuous presence of the first access node and the second access node during the transfer of communication since the latter is managed remotely by the management server. In addition, for the same reason, it is also not necessary for all nodes of access to the communication network to monitor the emissions of the measurement sensor in order to be able to establishing the second radio communication link with said sensor, thereby reducing the power consumption of the access nodes. In addition, the use of a communication transfer management server makes it possible to avoid the constant exchange of information between the access nodes and the measurement sensor, which makes it possible to reduce the consumption of resources, in particular in electrical energy, from the sensor and the access nodes involved in the transfer. In addition, the access nodes can update the service configuration parameters using the data received from a measurement sensor, which improves the communication transfer. In addition, the access nodes have no particular knowledge of having the measurement sensor to know a service using the data sent by said sensor. Finally, the method according to the invention makes it possible to manage data transfers coming from sensors of different types such as, for example, mobile sensors and fixed sensors.

The data received from the measurement sensor by the first access node or the second access node is exploited by a service application that can be installed either locally on said first access node and / or said second access node. either on the management server or on a remote operating server connected to the communication network. More preferably, the method comprises, prior to the step of reception by the management server of an information message comprising a transfer request, the steps, performed by the first access node, of:

detection of a crossing of a threshold of a transfer parameter of a communication, and

sending to the management server an information message comprising a transfer request following the detected crossing.

The transfer parameter may be, for example, the power of the signal received from the communication network by the first node, in particular when the first access node connects to the network over a radio communication link, or the signal power. received on the first radio communication link, or even the first access node comprising a battery pack, the amount of electrical energy stored in said battery pack. Information on the quality of the signal received from the network by the first access node can enable the management server to decide on a transfer of communication to the second access node when the quality of the signal received by the latter is better than that of the first access node, even if the quality of the signal received by the first node is sufficient to continue the communication, ie without crossing a threshold of a transfer parameter of the communication has been detected by the first access node.

Similarly, the management server can decide to transfer the communication to the second access node when it has not received any information messages from the first access node for some time, for example when periodic information messages are no longer sent by the first access node. This makes it possible to transfer the communication to the second access node, for example, when the first access is no longer connected to the communication network or when the first access node has gone off because its battery is discharged. or when the first access node is malicious and does not transfer the data to the management server or the service operating server.

According to one aspect of the invention, the method comprises, after the step of sending a request for establishment of a communication by the management server, the steps, performed by the second access node, of :

- reception of said request for establishment of a communication,

- establishing a communication with the measurement sensor on a second radio communication link, and

receiving, on said second radio communication link, signals comprising data relating to measurements made by the measurement sensor.

Advantageously, the method comprises a step performed by the second access node, for example periodically, sending to the management server an information message comprising information on the state of said second access node.

This information message may include information on the quality of the signal received from the network by said second access node (particularly when the second access node connects to the network over a radio communication link) and / or information the charge level of its power supply and / or information on its presence in the radio coverage of a measurement sensor. Thus, when several second access nodes are available, the management server can choose the one with the best signal quality to transfer the communication.

Advantageously, the method comprises, prior to the step of establishing a communication by the second access node, a step of sending by the measurement sensor, to the second access node, a message of notification authorizing or not the establishment of a communication on the second radio communication link with said second access node.

When the data is encrypted and the measurement sensor authorizes the establishment of communication with the second access node, the notification message may include a decryption key of the data. This decryption key may advantageously be stored by the second access node for later use.

The invention also relates to a sensor for measuring a plurality of values of at least one parameter, said sensor being configured to establish with a first access node to a communication network, on a first radio communication link, a communicating data relating to parameter values measured by the sensor and for establishing with a second access node to said communication network, on a second radio communication link, a data communication relating to parameter values measured by the sensor .

Among these so-called "connected" measuring sensors, there may be mentioned as an example, a smart watch in English language, a pedometer, a heart rate monitor, a management module for household electrical equipment, a mobile telephone, in particular a smartphone, a personal digital assistant (PDA), etc. Such sensors can, for example, be worn by a user or installed in a house or in a motor vehicle according to their function . The first radio communication link and the second radio communication link can be, for example, communication links such as Bluetooth ^® radio, WiFi, ZigBee, etc. .. known to the skilled person. According to one characteristic of the invention, the sensor is configured to communicate to the first access node a notification message authorizing or not the establishment of a communication on the first radio communication link with said first access node. According to another characteristic of the invention, the sensor is configured to communicate to the second access node a notification message authorizing or not the establishment of a communication on the second radio communication link with said second access node. Preferably, the measurement sensor is configured to periodically transmit a signal comprising an address (Uniform Resource Identifier or URI in English) allowing an access node to register with the management server.

The invention also relates to a first access node to a communication network, said first access node being remarkable in that it is configured for:

to establish, on a first radio communication link, a communication with a measurement sensor,

detecting a crossing of a threshold of a transfer parameter of said communication, and

- Send to a management server, via the communication network, an information message comprising a request to transfer the communication following the crossing detected. Preferably, the first access node is configured to send to the management server, preferably periodically, an information message comprising information on the state of said first access node, for example, information on the quality of the access node. signal received from the communication network by said first access node (particularly when the first access node connects to the network over a link of radio communication) and / or information on the level of charge of its power supply and / or information on its presence in the radio coverage of a measurement sensor. Advantageously, the first access node is configured to send a service request or a service update to the management server 30 or to an operating server of the service that exploits the data sent by the measurement sensor 40 in order to provide continuity of service when transferring a call to the second access node.

The first access node may further update the configuration parameters of a service using data received from the measurement sensor when this service is installed on said first access node, thereby improving the transfer of data. communication to a second access node as presented below.

According to a characteristic of the invention, the first access node can add information to the data received from the sensor before transferring it to the management server or to an operating server of the service via the communication network. For example, the first access node may add date, time, information measured by other sensors, service information, etc.

Preferably, the first access node is a user equipment.

According to one characteristic of the invention, the first access node is fixed or mobile.

The first access node may for example be a smartphone type phone, a touch pad, a box for connection to an IP network ("Internet box" in English), an on-board computer of a vehicle, etc. The invention also relates to a second access node to a communication network, said second access node being remarkable in that it is configured to:

- Receive from a management server, via the communication network, a request to establish a communication with a measurement sensor, previously established on a first radio communication link with a first access node to said communication network,

- establishing a communication with said sensor on a second radio communication link, and

receiving, on said second radio communication link, signals comprising data relating to measurements made by said measurement sensor.

According to a characteristic of the invention, the second access node is configured to send to the management server, preferably periodically, a quality message comprising information on the quality of the signal received from the communication network by said second node. access (in particular when the second access node connects to the network over a radio communication link) and / or information on the level of charge of its power supply and / or information on its presence in the radio coverage of a measuring sensor.

Advantageously, the second access node is configured to receive from said measurement sensor a notification message authorizing or not the establishment of a communication on the second radio communication link with said second access node.

The second access node may further update the configuration parameters of a service using data received from the measurement sensor, thereby improving the transfer of communication from a first access node as presented. previously.

According to a characteristic of the invention, the second access node can add information to the data received from the sensor before transferring it to the management server or to an operating server of the service via the communication network. For example, the second access node may add date, time, information measured by other sensors, service information, etc.

Preferably, the second access node is a user equipment.

According to one characteristic of the invention, the second access node is fixed or mobile. The second access node may for example be a smartphone-type phone, a touch pad, an IP network connection box ("Internet box" in English), an on-board computer of a vehicle, etc.

The invention thus also relates to a management server for transferring a data communication of a first radio communication link, between a measurement sensor and a first access node to a communication network, to a second link radio communication between said measurement sensor and a second access node to said communication network, the data being relating to measurements made by the sensor, the management server being remarkable in that, the management server being connected to the first access node and the second access node via the communication network, the management server is configured to:

receiving, from the first access node, an information message comprising information on the state of said first access node and / or a transfer request of the data communication, and

sending, to the second access node, a request to establish a data communication with the measurement sensor following the received information message.

Preferably, the management server is configured to receive, from the second access node, an information message comprising information on the state of said second access node. Thus, for example, when the management server receives, from the first access node, an information message comprising information on the quality of the signal received from the communication network by the first access node and the second node. access, an information message comprising information on the quality of the signal received from the communication network by said second access node, the management server can decide on a transfer of the call to the second access node when the quality of the signal received by the latter is better than the quality of the signal received by the first access node, even if the quality of the signal received by the first access node is sufficient to continue the communication (ie without a crossing of a threshold of a transfer parameter of the communication has been detected by the first access node). In addition, in the case where several second nodes are available to receive the transfer of the communication, the information messages sent to the management server by said second access nodes can be used by the management server to select the second node. who will receive the transfer of the communication.

The information message may also include information on the fixed or mobile nature of the access node. For example, the management server can use this information to prioritize forwarding a call to a fixed rather than mobile access node to save the latter's battery.

According to one aspect of the invention, the management server is configured to send an end-of-service request to the first access node 10 so that it terminates the service, preferably when the communication transfer has been made to the second access node.

The invention also relates to a system comprising at least one measuring sensor as presented above, a communication network, a management server as presented above, a first access node to the communication network as presented above and a second communication network access node as presented above, the management server being connected to the first access node and the second access node by said communication network.

The invention also relates to a data carrier for a computer program comprising instructions for implementing the method according to the invention when the program is executed by at least one processor.

Other features and advantages of the invention will become apparent from the following description given with reference to the appended figures given by way of non-limiting examples and in which identical references are given to similar objects.

DESCRIPTION OF THE FIGURES Figure 1 schematically illustrates an embodiment of the system according to the invention.

FIG. 2 illustrates the system of FIG. 1 when the measurement sensor is in communication with the first access node on the first radio communication link.

Figure 3 illustrates the system of Figure 1 subsequent to a transfer of communication to the second access node on the second radio communication link.

FIG. 4 illustrates a sequence diagram of one embodiment of the method according to the invention. DETAILED DESCRIPTION OF THE INVENTION

Description of an embodiment of the system according to the invention

The system 1 illustrated in FIG. 1 makes it possible to transfer a data communication of a first radio communication link L1 between a measurement sensor 40 and a first access node 10 to a communication network 5, towards a second radio communication link L2, between said measurement sensor 40 and a second access node 20 to said communication network 5.

I. System 1

In the embodiment illustrated in FIG. 1, the system 1 according to the invention thus comprises a communication network 5, a first access node 10 to the communication network 5, a second communication network access node 20 5, a management server 30 connected to the first access node 10 and the second access node 20 by said communication network 5 and a sensor 40 for measuring a plurality of values of at least one parameter. For the sake of clarity, only a communication network 5, a first access node 10, a second access node 20, a management server 30 and a measurement sensor 40 have been represented but it goes without saying that the system according to the invention may comprise more than one communication network 5, a first access node 10, a second access node 20, a management server 30 and a measurement sensor 40 .

A) Communication network 5

The communication network 5 connects the first access node 10, the second access node 20 and the management server 30. This communication network can be of any type, wired and / or wireless. This communication network 5 may comprise a plurality of interconnected subnetworks such as, for example, 2G, 3G, 4G networks, WLAN, LAN, the Internet network, etc. B) First access node 10

The first access node 10 is a fixed or mobile equipment allowing access to the communication network 5. More preferably, the first access node 10 is a user equipment, for example of smartphone or tablet type.

The first access node 10 is configured to:

- detecting the presence of the measuring sensor 40 in its radio coverage, e.g. using a Bluetooth ^® protocol, WiFi or Zigbee ...,

sending data associated with a service and received from the measurement sensor 40 to the management server 30 or to an operating server of the service via the communication network 5.

According to the invention, the first access node 10 is configured to:

to establish, on the first radio communication link L1, a communication with the measurement sensor 40,

detecting a crossing of a threshold of a transfer parameter of said communication, and - Send to the management server 30, via the communication network 5, an information message comprising a call transfer request established on the first link L1 radio communication following crossing detected. The first access node 10 is further configured to send to the management server 30, preferably periodically, an information message comprising information on the state of said first access node 10 such as, for example, information on the quality of the signal received from the communication network 5 by said first access node 10 and / or information on the level of charge of its power supply and / or information on its presence in the radio coverage of the measurement sensor 40 .

The first access node 10 is also configured to send a service request or update of a service to the management server 30 or to an operating server of the service that exploits the data sent by the measurement sensor 40 in order to ensure continuity of service when transferring a call to the second access node 20.

The first access node 10 can also add information to the data received from the sensor 40 before transferring it to the management server 30 or to an operating server of the service via the communication network 5. For example, the first node access 10 can add date, time, information measured by other sensors, service information etc. C) Second access node 20

The second access node 20 is a fixed or mobile equipment allowing access to the communication network 5. More preferably, the second access node 20 is a user equipment, for example of the smartphone or tablet type.

The second access node 20 is configured to:

- detecting the presence of the measuring sensor 40 in its radio coverage, for example, Bluetooth ^®, WiFi or Zigbee ..., sending data associated with a service and received from the measurement sensor 40 to the management server 30 or to an operating server of the service via the communication network 5.

According to the invention, the second access node 20 is configured to:

- Receive from the management server 30 via the communication network 5 a request to establish a communication with the measurement sensor 40, said communication being previously established on the first radio communication link L1 with the first access node 10 ,

to establish a communication with the measurement sensor 40 on a second radio communication link L2, and

receiving, on said second radio communication link L2, signals comprising data relating to measurements made by the measurement sensor 40.

The second access node 20 is further configured to receive from the measurement sensor 40 a notification message authorizing or not the establishment of a data communication with said second access node 20 on the second L2 radio communication link. .

The second access node 20 is also configured to send a service request or update of a service to the management server 30 or to an operating server of the service that exploits the data sent by the measurement sensor 40 in order to ensure continuity of service when transferring a call from the first access node 10.

The second access node 20 is further configured to send to the management server 30, preferably periodically, an information message comprising information on the state of said second access node 20 such as, for example, the quality. the signal received from the communication network 5 by said second access node 20 and / or information on the level of charge of its power supply and / or information on its presence in the radio coverage of the measurement sensor 40.

The second access node 20 can also add information to the data received from the sensor 40 before transferring it to the management server 20 or to a server 5. For example, the second access node may add date, time, information measured by other sensors, service information, etc. D) Server management 30

The management server 30 makes it possible to transfer a data communication from the first radio communication link L1 to the second radio communication link. For this purpose and according to the invention, the management server 30 is configured to:

receiving, from the first access node 10, an information message comprising information on the state of said first access node and / or a transfer request of the data communication, and

sending, to the second access node 20, a request for establishing a data communication with the measurement sensor 40 following the received information message.

The management server is also configured to receive, from the second access node, an information message comprising information on the state of said second access node.

The management server 30 is further configured to receive from the second access node 20 an information message comprising information on the state of said second access node 20 such as, for example, the quality of the signal received from the network. of communication 5 by said second access node 20.

Thus, for example, when the management server 30 receives, from the first access node 10, an information message comprising information on the quality of the signal received from the communication network 5 by said first access node 10 and, of the second access node 20, an information message comprising information on the quality of the signal received from the communication network 5 by said second access node 20, the management server 30 can decide on a transfer of the communication to the second access node 20 when the quality of the signal received by the latter is better than the quality of the signal received by the first access node 10, even when the quality of the received signal by the first access node 10 is sufficient to continue the communication (ie without crossing a threshold of a transfer parameter of the communication has been detected by the first access node). In addition, in the case where several second nodes 20 are available to receive the transfer of the communication, the information messages sent to the management server 30 by said second access nodes can be used by the management server 30 to choose the second access node 20 which will receive the transfer of the communication.

E) Measuring sensor 40

The sensor 40 makes it possible to measure a plurality of values of at least one parameter and to send data relating to these measurements in signals destined for the first access node 10 on the first radio communication link L1 and the second access node 20 on the second radio communication link L2.

For this purpose, the measurement sensor 40 is configured to establish such data communication:

with the first access node on the first radio communication link L1, and with the second access node on the second radio communication link L2.

The sensor sensor 40 called "connected sensor" may, for example, be a smart watch (English smart watch), a pedometer, a heart rate monitor, a management module of a household electrical appliance, a mobile phone, including a smartphone, a personal digital assistant (PDA), etc.

The first radio communication link and the second radio communication link can be, for example, communication links such as Bluetooth ^® radio, WiFi, ZigBee, etc. .. known to the skilled person.

In this example, the sensor is further configured to communicate: at the first access node 10, a notification message authorizing or not the management server 30 establishing a call on the first radio communication link L1 with said first access node 10,

- At the second access node 20 a notification message authorizing or not the establishment of a communication on the second radio communication link L2 with said second access node 20.

Furthermore, the measurement sensor 40 is configured to periodically transmit a signal comprising an address (Uniform Resource Identifier or URI in English) allowing an access node to register with the management server 30 so that it know him.

Finally, it should be noted that the exchange of data and information on the various links and communication networks can be encrypted and / or secured.

II. Implementation of the invention

One embodiment of the invention will now be described with reference to FIGS. 1 to 4. Firstly, with reference to FIG. 4, when the first access node 10 is in the radio coverage of the sensor 40, a discovery procedure (discovery in English) is performed in a step S1 between the first access node and the measurement sensor 40 to establish a communication on the first radio communication link L1.

Such a discovery procedure, known to those skilled in the art, is performed automatically as soon as the first access node 10 and the measurement sensor 40 are in the radio coverage of one another. This procedure may for example consist of a device called "master" (for example an access node) to periodically send notifications of its presence to other devices called "slaves" (for example a measurement sensor) which monitor periodically and respond, if necessary, by sending their identification parameters. This discovery procedure is performed at the so-called physical low layers of the radio protocol used on the first radio communication link L1. Once the discovery procedure has been completed, the measurement sensor 40 and the first access node 10 exchange data at the high layers of the radio protocol used on the first radio communication link L1, for example data encapsulated in packets. IP well known to those skilled in the art.

At this stage, the measurement sensor 40 can send, to the first access node 10, a notification message indicating whether the measurement sensor 40 authorizes or not the establishment of a data communication with said first access node. 10 on the first Ll radio communication link. In case of authorization and when the data sent by the measurement sensor 40 is encrypted, the notification message may include a decryption key of the data.

Once authorized, if necessary, the first access node 10 receives, in a step S2, on the first radio communication link L1 (as illustrated in FIG. 2), a signal emitted by the measurement sensor 40 comprising data relating to to measurements that the sensor 40 has made such as, for example, values of heart rate, blood pressure, sensor displacement speed, etc. In this example, the first access node 10 sends, in a step S3, via the communication network 5, the data received from the measurement sensor 40 to the management server 30 if it manages the service or, if the management server 30 does not manage the service, to an operating server of the service (not shown) Alternatively, if the service is installed on the first access node 10, the latter can directly process the data received from the sensor 40 to perform the service.

During the data communication by the measurement sensor 40 to the first access node 10, the first access node 10 regularly checks, in a step S4, the value of one or more communication transfer parameters.

For example, the first access node 10 can check the power of the signal received from the measurement sensor 40, the power of the signal received from an antenna (not shown) of connection to the communication network 5 (when the first access node 10 is mobile, for example smartphone type) or even its battery charge level. Thus, when the first access node 10 detects that the value of one of these parameters exceeds a predetermined threshold, for example when the power of the signal received from the measurement sensor 40 decreases below a predetermined power threshold it is necessary to transfer the communication to another communication network access node 5, in this case to the second access node 20, to ensure the continuity of the transmission of the data sent by the sensor 40 to the management server 30.

To do this and according to the invention, the first access node 10 sends to the management server 30, in a step S5a, an information message comprising a communication transfer request. The management server 30 receives this information message in a step S5b.

Alternatively or in addition, the first access node 10 can send, preferably periodically, the values of the transfer parameters or other information on its state to the management server 30 in an information message so that it decides whether or not to transfer communication, even in the absence of a transfer request.

Thus, when the quality of the signal received from the network 5 by the first access node 10 is less good than the quality of the signal received from the network 5 by the second access node 20, the management server 30 may decide to transfer the communication to the second access node 20 without the first access node 10 having sent a communication transfer request in an information message to the management server 30. When the management server 30 decides that a transfer is necessary, either because the first access node 10 can no longer provide communication on the first link of radio communication 10, or because the second access node 20 has a higher quality to ensure communication, the management server 30 sends, in a step S6a, a request to establish a communication to the second node 20, which receives it in a step S6b, so that the second access node 20 establishes a communication on the second radio communication link L2 with the measurement sensor 40 to collect the data sent by the measurement sensor 40 instead of the first access node 10.

The second access node 20 is previously registered with the management server 30. This recording can be done as soon as the second access node 20 enters the radio coverage of the measurement sensor 40 and periodically and as long as the second node 20 is in the radio coverage of the sensor 40, the second access node 20 can send to the management server 30 an information message including information on its status such as, for example, information on the quality of the signal it receives from the communication network 5, for example the power of the received signal.

Thus, when several second access nodes 20 are available with a received signal quality of the satisfactory network 5, the management server 30 can select the second access node which will establish a second radio communication link L2 with the measurement sensor. 40, for example the one receiving the most powerful signal of the communication network 5.

When receiving the request to set up a communication from the management server 30, the second access node 20 triggers, in a step S7, a discovery procedure (as described above) with the measurement sensor 40 in order to establish a data communication on the second radio communication link L2. As a variant, the discovery procedure can be advantageously performed before the reception of the establishment request by the second access node 20, for example as soon as the second access node 20 enters the radio coverage of the sensor 40, in order to reduce the call setup time. At this point, the second access node 20 may send a service request or a service update request to the management server 30 or to an operating server of the service that exploits the data of the sensor 40. The request service provides service data allowing the second access node 20 to start the service, even before the transfer of communication, to ensure the continuity of said service. Similarly, the service update request makes it possible to update the service when it is installed locally on the second access node 20 in order to ensure the continuity of the service.

Similarly, the measurement sensor 40 can send a notification message to the second access node 20 indicating whether the measurement sensor 40 allows or not the establishment of a data communication with said second access node 20 on the second radio communication link L2. In case of authorization and when the data sent by the measurement sensor 40 is encrypted, the notification message may include a decryption key of the data.

Once communication is established, as illustrated in FIG. 3, the second access node 20 receives on the second radio communication link L2, in a step S8, a signal transmitted by the measurement sensor 40 comprising data relating to measurements that the sensor 40 has made.

Once communication is established, the management server 30 can send in a step S9 an end of service request to the first access node 10 so that it terminates the service since the transfer of communication has been achieved.

The second access node 20 sends, in a step S10, via the communication network 5, the data received from the measurement sensor 40 to the management server 30 if it manages the service or, if it is not the server management system 30 which manages the service, to a server operating the service (not shown). Alternatively, if the service is installed on the second access node 20, the latter can directly process the data received from the sensor 40 to perform the service. It will be noted that step S10 can also be performed before step S9 or that steps S9 and S10 can also be performed concomitantly.

I II. Examples of application a) Part 1

A user is equipped with a sensor 40 for measuring his heart rate, muscle contractions and his electrodermal activity.

The user has subscribed to a medical service for detecting abnormalities such as, for example, epileptic seizures. The user therefore wants a continuity of this service while maintaining a low life, that is to say for example to leave his home easily and safely.

When the user is at home, the data is transferred, on a first radio communication link L1, to a first access node 10 presented in this example in the form of a fixed device for accessing the Internet 5 ("Internet box" in English) to save the batteries of other first mobile access nodes.

The first access node 10 can extract remarkable characteristics of these data and enrich them, for example, with indications of dates, time of place (GPS coordinates for example) etc.

When the user leaves his home by taking away his smartphone, the first access node 10 detects a weakening of the signal received from the measurement sensor 40 and sends to the management server 30, via the communication network 5, a request for transfer of the Communication. The management server 30 also detects the presence of a second access node 20 near the measurement sensor 40, this second access node 20 being the smartphone of the user who has been previously identified with the server. management 30. When it receives the transfer request from the data communication of the first access node 10, the management server 30 sends, to the second access node 20, a request to establish a data communication with the measuring sensor 40.

The smartphone then establishes a communication with the measurement sensor 40 on a second L2 radio communication link in order to receive the measurement data from the sensor 40. The smartphone, which includes an accelerometer, can extract remarkable characteristics of these data and enrich them. , for example, with measurements of its accelerometer. b) Part 2

Still in reference to this same user and to the same service, a data communication is carried out between its measurement sensor 40 and a first access node 10 presented in this example in the form of a smartphone. When the user enters his vehicle, the on-board computer, which is already known to the management server 30, sends a presence message of the sensor 40 in its network coverage to the management server 30.

The management server 30 then decides to transfer the call to a second radio communication link L2 between the sensor 40 and the second access node 20 constituted by the on-board computer.

The on-board computer can enrich the data of the sensor 40 with measurements made on board the vehicle such as, for example, the speed of the vehicle, its GPS position, etc. c) Part 3 When the user leaves his vehicle to enter the home of a friend, the communication is similarly transferred from the on-board computer to the smartphone of the user. d) Part 4

When the charge level of the smartphone's battery falls below a predetermined threshold, the smartphone sends a communication transfer request to the management server 30 which then sees no second access node 20 available.

When the smartphone battery is discharged, the smartphone turns off and the service is interrupted. The user then wants to use the touch pad of his friend. The touch pad receives the U RI sent periodically by the measurement sensor 40 and installs the service, preferably after the user has provided an identifier and a password.

The service is then installed and then started on the touch pad that sends the management server 30 a presence message of the sensor 40 in its radio coverage. The management server 30 then sends a communication transfer request to the touch pad which then establishes the data communication with the sensor 40 on a second L2 communication link to ensure continuity of service. In the case where no second access node 20 is available to ensure the continuity of the service and if the measurement sensor 40 is configured to communicate with the communication network 5, the communication can be transferred to a link of radio communication (not shown) between the sensor 40 and the communication network 5 to a server operating the service. e) Part 5 When the user enters his home (the service having been continued in the meantime on the return journey similarly to the outward journey), his smartphone transmitting data to the measurement sensor and periodically sending informational messages on the its state, the management server 30 detects the Internet box home and decides to transfer the measurement sensor 30 communication to the Internet box, the latter being fixed and to preserve the battery of the user's smartphone.

The method according to the invention thus makes it possible to easily, quickly and efficiently carry out the transfer of a data communication sent by a measurement sensor 40 to an access node to a communication network of a first radio communication link L1. to a second radio communication link L2.

Finally, it should be noted that the present invention is not limited to the examples described above and is capable of numerous variants accessible to those skilled in the art. In particular, the number of access nodes 10, 20, management servers 30 and measurement sensors 40, as well as the nature and type of the links and the communication network as shown in the figures so as to illustrate a embodiment of the invention, can not be interpreted as limiting.

Claims

A method of transferring data communication from a first radio communication link (L1) between a measurement sensor (40) and a first access node (10) to a communication network (5), a second radio communication link (L2) between said measurement sensor (40) and a second access node (20) to said communication network (5), the data relating to measurements made by the sensor (40); ), said method being characterized in that, the first access node (10) and the second access node (20) being connected to a management server (30) via the communication network (5), the method includes the steps of:

- receiving (S6b), by said management server (30), an information message sent by the first access node (10), said information message comprising information on the state of said first node, access (10) and / or a transfer request of the data communication, and

sending (S7a), by the management server (30), to the second access node (20) of a request for establishing a communication with the measurement sensor (40) following the information message received .

2. Method according to claim 1, characterized in that it comprises, prior to the step of receiving (S6b) by the management server (30) an information message comprising a transfer request, the steps, performed by the first access node (10), of:

detection (S5) of a crossing of a threshold of a transfer parameter of a communication, and

sending (S6a) to the management server (30) an information message comprising a transfer request following the detected crossing.

3. Method according to one of the preceding claims, characterized in that it comprises, after the step of sending (S7a) a request for establishment of a communication by the management server (30), the steps, performed by the second access node (20), of:

reception (S7b) of said request for establishing a communication,

establishing (S8) a communication with the measurement sensor (40) on a second radio communication link (L2), and - receiving (S10), on said second radio communication link (L2), signals comprising data relating to measurements made by the measuring sensor (40).

4. Method according to one of the preceding claims, characterized in that it comprises, prior to the establishment step (S8) of a communication, a sending step (S2a) by the measuring sensor (40). ), at the second access node (20), a notification message authorizing or not the establishment of a communication on the second radio communication link (L2) with said second access node (20).

A measurement sensor (40) of a plurality of values of at least one parameter, said sensor (40) being configured to establish with a first access node (10) to a communication network (5), on a first radio communication link (L1), a data communication relating to parameter values measured by the sensor (40) and for establishing with a second access node (20) to said communication network (5), on a second radio communication link (L2), a data communication relating to parameter values measured by the sensor (40), the sensor (40) being further configured to periodically transmit a signal comprising an address enabling a node of access to register with the management server.

6. Sensor (40) according to the preceding claim, characterized in that it is configured to communicate to the second access node (20) a notification message authorizing or not the establishment of a communication on the second communication link radio (L2) with said second access node (20).

7. First access node (10) to a communication network (5), said first access node (10) being characterized in that it is configured to:

establishing, on a first radio communication link (L1), communication with a measurement sensor (40),

- Send to a management server (30), via the communication network (5), a request to transfer the communication following the crossing detected.

8. Second access node (20) to a communication network (5), said second access node (20) being characterized in that it is configured to:

- Receive from a management server (30), via the communication network (5), a request for establishing a communication with a measurement sensor (40), previously established on a first radio communication link (Ll). ) with a first access node to said communication network (5),

- establishing a communication with said measuring sensor (40) on a second radio communication link (L2), and

receiving, on said second radio communication link (L2), signals comprising data relating to measurements made by said measurement sensor (40).

A management server (30) for transferring data communication from a first radio communication link (L1) between a measurement sensor (40) and a first access node (10) to a network communication device (5) to a second radio communication link (L2) between said measurement sensor (40) and a second access node (20) in said communication network (5), the data relating to measurements performed by the sensor (40), the management server (30) being characterized in that, the management server (30) being connected to the first access node (10) and the second access node (20) via the communication network (5), the management server (30) is configured to:

receiving, from the first access node (10), an information message comprising information on the state of said first access node (10) and / or a transfer request of the data communication, and

sending, to the second access node (20), a request to establish a data communication with the measurement sensor (40) following the received information message.

10. System (1) comprising at least one measuring sensor (40) according to one of claims 5 and 6, a communication network (5), a management server (30) according to the preceding claim, a first node of access (10) to the communication network (5) according to claim 7 and a second access node (20) to the communication network (5) according to claim 8, the management server (30) being connected to the first node access (10) and the second access node (20) by said communication network (5).