Method and apparatus for communication between a vehicle and a public land mobile network

Abstract

The invention relates to a communication method for communicating between a communication system of a vehicle (10) and a public land mobile network (100). To this end, first information is received, which characterizes the current electrical consumption of the vehicle (10); second information is received, which characterizes the amount of electrical energy (10) available in the vehicle (10), for example in the battery of the vehicle (10); and third information is received, which characterizes a target duration during which the vehicle (10) is expected to remain connected to the network (100). On the basis of the first, second and third information, the network (100) determines which energy saving mode should be assigned to the communication system of the vehicle (10) so that the vehicle can remain connected to the network (10) for the desired duration.

Description

Technical Field

[0001] The present invention relates to a method and apparatus for communicating between a vehicle and a public land mobile network, such as a 4G or 5G cellular network.

[0002] The invention also relates to a method and a device for optimizing energy consumption in order to maintain a connection between the vehicle and the network for a determined period of time. Background Art

[0003] Modern vehicles are equipped with one or more devices that need to maintain a connection to a network, such as a wireless cellular network. These devices correspond, for example, to computers (also known as UCEs ("Unité de Commande Electronique," or ECUs for "Electronic Control Unit")) or telematics control units, known as TCUs for "Telematic Control Unit." These computers, for example, are loaded with one or more software programs that are executed to ensure their functions. These software programs sometimes need to be updated, for example to improve functionality or correct errors (also known as "bugs" in IT). These computers or units can also submit information to servers, emergency services, or data centers of vehicle manufacturers or auto parts manufacturers.

[0004] These data exchanges are carried out over the air, for example, using a technology called OTA ("over-the-air" in English or "par voie aérienne" in French) to download updates. This technology, like all cellular communications, relies on one or more public land mobile networks.

[0005] The communication established between the vehicle and the network consumes energy, in particular at the location of the vehicle where the electrical energy is supplied by one or more batteries. In particular, when the vehicle is in a situation where the batteries are not being recharged, the amount of electrical energy available in the vehicle is limited.

[0006] Therefore, this can prove problematic when, for example, a vehicle is not used during an extended period and when the vehicle's battery is not rechargeable, maintaining communications between the vehicle and the network can thereby deplete the amount of energy available in the vehicle. Summary of the Invention

[0007] The object of the present invention is to optimize the communication between a vehicle and a land mobile network.

[0008] Another object of the invention is to optimize the energy consumption carried out by the vehicle while ensuring that the connection to the land mobile network is maintained.

[0009] According to a first aspect, the invention relates to a method of communication between a communication system of a vehicle and a public land mobile network, said vehicle being stationary in a cell of said network, said method being implemented by said network, said method comprising the following steps:

[0010] - receiving first information characterizing electrical consumption of the vehicle;

[0011] - receiving second information representative of the amount of power available in the vehicle;

[0012] - receiving third information representing a maintenance target for maintaining the connection between the communication system and the network for a determined period of time;

[0013] - determining at least one energy saving mode to be assigned to the communication system of the vehicle based on the first information, the second information and the third information;

[0014] - transmitting a switching instruction for switching to the at least one determined energy-saving mode to the communication system of the vehicle.

[0015] According to a variant, said determination of at least one energy saving mode comprises selecting a sleep mechanism for putting the communication system of the vehicle to sleep at regular time intervals of determined duration from a plurality of mechanisms supported by the network.

[0016] According to another variant, the plurality of mechanisms comprises:

[0017] - Energy saving mode mechanism, called PSM;

[0018] -Discontinuous reception mechanism, called DRX;

[0019] - Extended discontinuous reception mechanism, called eDRX;

[0020] -Continuous reception mechanism in connected mode, called CDRX.

[0021] According to a further variant, said determination of at least one energy saving mode comprises selecting an energy saving profile from a plurality of energy saving profiles, each of said plurality of energy saving profiles being associated with a set of applications and / or services to be maintained active and with a set of associated communication parameters comprising:

[0022] - frequency of data exchange; and / or

[0023] - Packet size.

[0024] According to an additional variant, the plurality of energy saving profiles comprises a profile in which only one or more emergency services remain active.

[0025] According to another variant, the selection of an energy saving profile depends on a virtual image of the communication system of the vehicle, the virtual image being recorded in the network.

[0026] According to a second aspect, the invention relates to an apparatus configured for a public land mobile network for communicating with a communication system of a vehicle, said apparatus comprising a memory associated with at least one processor configured to implement the steps of the method according to the first aspect of the invention.

[0027] According to a third aspect, the invention relates to a communication system comprising an apparatus according to the second aspect of the invention as described above and at least one vehicle coupled to the public land mobile network via a wireless connection.

[0028] According to a fourth aspect, the present invention relates to a computer program comprising instructions adapted to perform the steps of the method according to the first aspect of the invention, in particular when the computer program is executed by at least one processor.

[0029] Such a computer program may use any programming language and be in the form of source code, object code or an intermediate code between source code and object code, such as a partially compiled form or any other desired form.

[0030] According to a fifth aspect, the present invention relates to a computer-readable recording medium, on which a computer program is recorded, the computer program comprising instructions for executing the steps of the method according to the first aspect of the present invention.

[0031] On the one hand, the recording medium can be any entity or device capable of storing the program. For example, the medium can include a storage component (such as a ROM memory, a CD-ROM or a ROM memory of a microelectronic circuit type) or a magnetic recording component or a hard disk.

[0032] Alternatively, the recording medium may be a transmissible medium, such as an electrical or optical signal, which can be transmitted via an electrical or optical cable or by conventional radio or Hertzian radio or by a self-guided laser beam or by other means. The computer program according to the invention can in particular be downloaded from a network of the Internet type.

[0033] Alternatively, the recording medium may be an integrated circuit in which the computer program is embedded, the integrated circuit being suitable for executing the method in question or being suitable for being used in the execution of the method in question. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] By reading the following detailed description of the non-limiting embodiments of the present invention and the accompanying Figures 1 to 3 , other features and advantages of the present invention will be more apparent from the accompanying drawings:

[0035] Figure 1 schematically illustrates a communication environment between a vehicle and a public land mobile network infrastructure according to a particular embodiment of the present invention;

[0036] Figure 2 Schematically shows a method according to a particular embodiment of the present invention Figure 1 a communication device for a network;

[0037] Figure 3 A method for performing a multi-processing operation according to a particular embodiment of the present invention is shown. Figure 1 Vehicles and Figure 1 A flowchart of the different steps of a communication method for communicating between public land mobile networks. DETAILED DESCRIPTION

[0038] Now, in the following joint reference Figures 1 to 3 A communication method and a communication device for communicating between a communication system of a vehicle and a public land mobile network are described.Throughout the following description, like elements are identified with like reference numerals.

[0039] According to a non-limiting particular embodiment of the invention, a communication method for communicating between a communication system of a vehicle and a public land mobile network comprises: receiving first information representing the current electrical consumption of the vehicle; receiving second information representing the amount of charge available in the vehicle (e.g., in the battery of the vehicle); and receiving third information representing a target duration during which the vehicle wishes to remain connected to the network. Based on the first, second, and third information, the network determines which energy-saving mode should be assigned to the communication system of the vehicle so that the vehicle can remain connected to the network for the desired duration. The network then transmits to the vehicle which energy-saving mode the communication system should switch to.

[0040] The vehicle communicates information about its energy consumption, its energy resources, and its connection duration targets to the network. This communication enables the network to implement mechanisms that meet the vehicle's expectations regarding connection maintenance. This allows the energy resources available at the vehicle's location to be optimized to maintain the connection to the network.

[0041] Although the following description relates to a communication method and a communication device for communicating between a vehicle's communication system and a public land mobile network, the present invention is not limited to this embodiment. The present invention extends to a communication method and a communication device for communicating between any mobile communication device (e.g., a smartphone, a tablet, or a connected object) and any mobile network.

[0042] Figure 1 A communication environment 1 between a vehicle 10 and a public land mobile network infrastructure according to a non-limiting particular embodiment of the present invention is schematically illustrated.

[0043] Figure 1 A vehicle 10 is shown, which is parked, for example, in a parking position in a parking lot or garage and which communicates with one or more remote servers or "clouds" 100 (or "nuage" in French) via one or more communication equipment 110 of the cellular network relay antenna type, said one or more communication equipment forming part of the infrastructure of the public land mobile network. The public land mobile network advantageously corresponds to a cellular type network, for example a 3GPP network of the fourth or fifth generation ("3 rd Generation Partnership Project”, or in French “Projet departenariat de 3 ème 4G or 5G respectively).

[0044] The vehicle 10 is, for example, part of a group of vehicles 10 , 11 , 12 that have been stationary for a determined period of time, such as days, weeks or months.

[0045] Vehicle 10 includes, among other things, a communication system supplied with electrical energy by a battery of defined capacity. The communication system, for example, includes a communication device (e.g., a TCU) coupled to one or more computers of the vehicle 10's onboard system. The computer(s) may, for example, be a computer that submits data (e.g., from sensors of the vehicle 10) to one or more servers in a "cloud" 100 and / or receives data from the server(s) via a wireless connection conforming to the LTE ("Long-Term Evolution" in English, "Evolution à long terme" in French), LTE-Advanced (or LTE-avancé in French), or 3GPP 5G standards.

[0046] The quantity of electrical energy corresponds to a quantity in ampere-hours (denoted Ah, which is a unit of electrical charge, 1 Ah corresponding to the quantity of electrical energy flowing through the cross-section of a conductor through which a current having an intensity of 1 ampere flows during 1 hour). The quantity of electrical energy corresponds to a quantity in watt-hours (or kilowatt-hours, denoted kWh, 1 kWh corresponding to the quantity of energy consumed by a 1000-watt device during 1 hour). Conversion from one unit to the other is possible using, for example, the nominal voltage V at the terminals of the battery of the vehicle 10, Ah*V=>Wh.

[0047] The state of charge (called SOC (English for "State of Charge")) or depth of discharge (called DOD (English for "Depth of Discharge") of the battery means the charge level of the battery. This information is obtained, for example, with the help of a BMS system (English for "Battery Management System" or French for "Système de des batteries”) or by means of a computer for receiving battery parameters capable of establishing said SOC.

[0048] The elements forming the communication system are connected to each other via a wired network, such as CAN ("Controller Area Network" in English or "Réseau" in French). ”), CANFD (English for “Controller Area Network Flexible Data-Rate”, or French for “Réseau de à débit de données flexible”), FlexRay (according to ISO 17458 standard) or Ethernet (according to ISO / IEC 802.3 standard) type networks.

[0049] The vehicle 10 is advantageously stationary or nearly stationary in a grid with a mobile network (through which one or more communications are established). The grid corresponds to the geographical coverage area of ​​communication antennas (also called base stations, such as antenna 110) and allows radio communications to be established between the vehicle 10 and the network infrastructure of the mobile network.

[0050] According to a particular embodiment, the mobile network is a 3GPP 5G type network. According to this example, the network is divided into network slices on the basis of technologies of the SDN (Software-Defined Networking in English, or “Réseau défini de manièrelogicielle” in French) and / or NFV (Network Function Virtualization in English, or “Virtualisation de fonction réseau” in French). A network slice corresponds to a form of virtual network architecture, that is to say to a logical instance of the land mobile network. This division of the network into slices allows the creation of multiple virtual networks on a common shared physical infrastructure. Each network slice is allocated a set of resources dedicated by the operator of the network for a specific use by a given customer (for example a car manufacturer) or for a particular device (for example a communication system for a vehicle 10). This segmentation of the 3GPP 5G public land mobile network is described and defined, for example, in the specification document entitled "5G; System Architecture for the 5G System" (reference number ETSI TS 123 501, version 15.2.0, published in June 2018). According to a variant, the vehicle 10 accesses one or more slices of the network to access services associated with these network slices, the determined services being associated with the network slices. Each network slice corresponds to an end-to-end (that is, from the vehicle 10 to the physical or virtual machine) virtual network of the "cloud" 100 for providing the associated services.

[0051] In a first operation, the network (e.g., one or more servers of the "cloud" 100) receives: first information representing the current electrical consumption of the vehicle 10; second information representing the amount of electrical power available in the vehicle 10; and third information representing a target for maintaining the connection between the communication system of the vehicle 10 and the network for a determined period of time. This information is transmitted periodically or aperiodically by the vehicle 10 via a wireless connection, for example, at the request of the network or on the initiative of the communication system of the vehicle 10. The wireless connection is, for example, an OTA-type connection and complies with a wireless communication standard (e.g., LTE, LTE-Advance, or 3GPP 5G standards).

[0052] The first information corresponds to, for example, the amount of power provided by the battery at a given moment, and is obtained, for example, from a BMS system associated with the battery.

[0053] The second information corresponds, for example, to the amount of charge remaining in the battery at the moment the first information is provided, such as the state of charge SOC or depth of discharge DOD obtained, for example, from a BMS system associated with the battery.

[0054] The third information corresponds, for example, to the duration (e.g., in hours or days) during which the vehicle 10 is expected to maintain communication with the mobile network. This third information corresponds, for example, to a duration determined based on the environment and situation in which the vehicle is located. This duration is, for example, predetermined (i.e., stored in a memory of the communication system). According to a variant, this duration is a configurable parameter value, for example, a value entered by the vehicle user via a human-machine interface (IHM).

[0055] In a second operation, the network determines one or more energy saving modes to be assigned to the communication system of the vehicle 10 based on the received first information, second information, and third information.

[0056] According to a first particular embodiment, a first energy saving mode is determined, corresponding to a sleep mechanism for putting the communication system of the vehicle 10 to sleep. The mechanism assigned to the communication between the communication system of the vehicle 10 and the network is advantageously selected from a list of available mechanisms that are compatible with the communication standard of the mobile network (e.g., LTE, LTE-Advanced, or 3GPP 5G). The mechanism is selected based on parameters provided by the vehicle 10 and corresponding to the received first, second, and third information. The selected mechanism corresponds, for example, to one of the following mechanisms:

[0057] a PSM mechanism (“Power Saving Mode” in English or “Mode d'économie d'énergie” in French): this mechanism makes it possible to switch off the radio of the radio system of the vehicle 10 for an extended period; according to this mechanism, once in a dormant or standby state during a determined active time (indicated by a timer designated T3324), the radio system is to listen to the “paging” (or “télé-avertissement” in French) channel; once this timer has expired, the radio system of the vehicle 10 is no longer reachable by the network or “cloud” 100, since its radio has been deactivated for a duration corresponding to a timer designated T3412; timers T3324 and T3412 are determined, for example, by the network or “cloud” 100;

[0058] DRX mechanism (“Discontinuous Reception” in English, or “Réception discontinue” in French): this mechanism makes it possible to turn off the radio system of the vehicle 10 in order to periodically turn it on again in order to monitor the PDCCH channel (“Physical Downlink Control Channel” in English, or “canal de commande physique descendant” in French) according to a period called the DRX cycle, which corresponds to periods of sleep (“DRX sleep” in English) alternating with periods of activity (“DRX Active State” in English); the value of this DRX cycle varies between 2 ms and 640 ms, while the value of the active period varies between 1 ms and 200 ms;

[0059] - eDRX mechanism (“Extended Discontinuous Reception” in English, or “Réception discontinueétendue” in French): this mechanism corresponds to an extended mode of the DRX mechanism, that is, the periods of inactivity of the radio module can be extended relative to the inactivity periods of the DRX mechanism; according to this mechanism, the “paging” (or “télé-avertissement” in French) interval can be extended to a value between 5.12 seconds and 2621.144 seconds, that is, the radio system of the vehicle 10 can be in a dormant or standby state during the “paging” interval, the radio module of the radio system waking up at the end of each interval to listen to the PDCCH logical channel (“Physical Downlink Control Channel” in English, or “canal de commande physique descendant” in French), on which the “paging” RRC (“Radio Resource Control” in English, or “ de ressource radio”) message to inform the vehicle 10 that data is waiting to be transmitted with the vehicle’s radio system as the destination;

[0060] -CDRX mechanism ("Connected Mode Discontinuous Reception" in English, or "Réception discontinue en mode connecté" in French): This mechanism corresponds to the connected mode DRX mechanism, that is, according to this CDRX mechanism, the short DRX cycle is optional and, if this short DRX cycle is not activated, only the long DRX cycle is performed.

[0061] Of course, the sleep mechanisms in the above list are provided only as examples, and the sleep mechanism for putting the communication system of the vehicle 10 to sleep is not limited to the above examples.

[0062] The examples in the above list are mechanisms known to those skilled in the art and compliant with the LTE standard. These mechanisms are described, for example, in the book "Cellular Internet of Things: from massive deployments to critical 5G" by Olof Liberg et al.

[0063] According to a second particular embodiment, a second energy-saving mode is determined, corresponding to an energy-saving profile assigned to the communication system of vehicle 10. The assigned profile is selected, for example, from a list of determined energy-saving profiles. Each profile corresponds, for example, to a reduced list of applications or services to be maintained active and with associated communication parameters, the list being reduced the greater the energy savings to be achieved. The profile is advantageously selected based on parameters provided by vehicle 10 and corresponding to the received first, second, and third information.

[0064] As an example, the energy saving profile list includes the following profiles, but is not limited to the following profiles:

[0065] a low-consumption profile: according to which a first limited group of applications remains executed and a second limited group of services is maintained, such as location services of the vehicle 10 , “push” (or “poussé” in French) type services, emergency services (automatic alerts of safety services in the event of an accident or breakdown, for example), with associated communication parameters (such as a low frequency of data exchanges between the network and the vehicle 10 (for example only once every minute) and a reduced size of the data packets exchanged); according to a variant, the communication parameters associated with each service or application vary from one service (or application) to another;

[0066] - a very low-consumption profile: according to which the number of executed applications and maintained services is reduced compared to the low-consumption profile, the associated communication parameters being configured to reduce consumption by, for example, reducing the frequency of data exchanges (for example only every 10 minutes) and / or by reducing the size of the exchanged data packets; according to a variant, the communication parameters associated with each service or application vary from one service (or application) to another;

[0067] - Extra low consumption profile: According to this profile, applications or services related to emergency systems are maintained with an extremely low data exchange frequency (for example only once every 30 minutes) and a very small size of the data packets.

[0068] According to a variant embodiment, the profile best adapted to the vehicle's capabilities (defined by the first, second, and third information) is determined by the network based on a virtual image of the vehicle's 10 communication system, such a virtual image corresponding, for example, to the backup of applications and services provided by the vehicle 10 and the backup of the vehicle's 10 hardware and software parameters on the network slice of the "cloud" 100. According to this variant, the network or "cloud" is able to test different profiles and different associated communication parameters, which are able to respond to a request from the vehicle 10 for a duration of time to maintain communication with the network based on the power consumption information and the state of charge before determining the optimal profile.

[0069] According to the third embodiment, the network combines a sleep mechanism for putting the radio system to sleep (as described according to the first embodiment) and an energy saving profile (as described according to the second embodiment) to respond to a request from the vehicle 10 for a duration of time to maintain communication with the network based on the power consumption information and the state of charge.

[0070] According to another embodiment, the first and second information are periodically transmitted to the network so that the network can adapt the sleep mechanism and / or the energy saving profile to the actual electrical consumption of the vehicle 10 and the actual charge remaining in the battery.

[0071] In a fourth operation, the network (e.g., a server of the “cloud” 100 ) transmits a request destined for the vehicle 10 to inform the vehicle of one or more energy saving modes that have been assigned by the network to the communication system of the vehicle 10 based on the first information, the second information, and the third information.

[0072] This request or these requests are transmitted via an OTA type wireless connection implemented for receiving the first information, the second information and the third information and for exchanging data between the “cloud” 100 and the vehicle 10 .

[0073] The request includes, for example, a set of associated communication parameters associated with and defining one or more energy saving modes assigned to the vehicle 10. Application of these parameters enables the vehicle to enter the one or more energy saving modes.

[0074] According to a variant, the transmitted request or requests include an identifier for each allocated energy-saving mode, the vehicle 10 having a correspondence table (or LUT, for "Look-Up Table") in a memory (for example, in the memory of a computer of the communication system of the vehicle 10) that associates each identifier with an energy-saving mode and its associated parameters. According to this variant, the energy-saving modes that can be implemented by the communication system of the vehicle 10 are predefined and known from the vehicle 10 and the network.

[0075] According to particular embodiments, the vehicle 10 automatically exits one or more energy saving modes assigned by the network, for example, when one or more of the following conditions are met:

[0076] - The vehicle 10 moves and exits the network grid in which it is parked;

[0077] the battery of the vehicle 10 is recharged (for example after starting the thermal engine of the vehicle 10 or after connecting the battery of the vehicle 10 to a recharging terminal of a public or private electrical supply network);

[0078] - The driver takes action to deactivate one or more energy saving modes, for example via the IHM.

[0079] Figure 2 Schematically, a communication device 2 in a public land mobile network according to a non-limiting particular embodiment of the invention is shown. The device 2 corresponds, for example, to a server of a "cloud" 100 or to a device 10 carried by a vehicle for communicating with said public land mobile network.

[0080] The device 2 is designed, for example, to carry out a reference Figure 1 Operations described and / or references Figure 3The steps of the method described. Examples of such a device 2 include, but are not limited to: a server, a computer, a computing device, a loaded electronic equipment (e.g., a vehicle onboard computer), an electronic computer (e.g., a UCE), a telematics control unit TCU ("Telematic Control Unit"), a smart phone ("smartphone"), a tablet computer, and a laptop computer. The components of the device 2 may be integrated individually or in combination in a single integrated circuit, in multiple integrated circuits, and / or in discrete components. The device 2 may be implemented in the form of an electronic circuit or a software (or information) module, or in the form of a combination of an electronic circuit and a software module. According to different specific embodiments, the device 2 is communicatively connected to other devices or similar systems, for example, by means of a communication bus or via a dedicated input / output port.

[0081] Device 2 includes one (or more) processors 20 configured to execute instructions to implement the steps of the method and / or execute instructions of one or more software programs loaded into device 2. Processor 20 may include integrated memory, input / output interfaces, and various circuits known to those skilled in the art. Device 2 also includes at least one memory 21, which may correspond to, for example, volatile and / or non-volatile memory and / or include memory storage devices that may include volatile and / or non-volatile memory, such as EEPROM, ROM, PROM, RAM, DRAM, SRAM, flash memory, magnetic disk, or optical disk.

[0082] One or more loaded software information codes including instructions to be loaded and executed by the processor are stored, for example, on the first memory 21 .

[0083] According to a non-limiting particular embodiment, the device 2 comprises a block 22 of interface elements for communicating with external devices such as, for example, a remote server or the “cloud”, a vehicle's communication system, a computer, a TCU. The interface elements of the block 22 comprise one or more of the following interfaces:

[0084] - Radio frequency interface RF, which is for example or LTE ("Long-Term Evolution" in English, or "Evolution à long terme" in French), LTE-Advanced (or "LTE-avancé" in French), and 3GPP 5G types;

[0085] -Interface USB ("Universal Serial Bus" in English, or "Bus Universel en Série" in French);

[0086] -HDMI interface ("High Definition Multimedia Interface" in English, or "Interface Multimedia Haute Définition" in French).

[0087] The data are loaded towards the device 2 , for example via the interface of the block 22 , using a 4G network (or LTE Advanced according to 3GPP release 10) or a 5G network.

[0088] According to another particular embodiment, the device 2 comprises a communication interface 23 capable of establishing communication with other devices, such as a positioning system of the GPS type, a mobile communication system (GSM, GPRS, Wi-Fi, Bluetooth, LTE, LTE-V, ITS G5), or a radar of a radar system, via a communication channel 230. The communication interface 23 corresponds, for example, to a transmitter designed to transmit and receive information and / or data via the communication channel 230. The communication interface 23 corresponds, for example, to a CAN (“Controller Area Network” in English or “Réseau de ”), CAN FD (English for “Controller Area Network Flexible Data-Rate”, or French for “Réseau de à débit de données flexible”), automotive Ethernet (or in French “Ethernet automobile”), FlexRay (according to the ISO 17458 standard) or Ethernet (according to the ISO / IEC 802.3 standard) type wired networks.

[0089] According to additional particular embodiments, the apparatus 2 may provide output signals to one or more external devices (eg a display screen, one or more speakers and / or other peripheral devices) via output interfaces (not shown), respectively.

[0090] Figure 3 A flowchart showing the different steps of a communication method for communicating between a communication system of a vehicle and a public land mobile network according to a non-limiting particular embodiment of the invention. The method is advantageously implemented, for example, by Figure 2 The device 2 is implemented in a network (for example, in one or more servers).

[0091] In a first step 31 , first information is received, which is characteristic of the electrical consumption of the vehicle.

[0092] In a second step 32 , second information is received, which is representative of the amount of electrical power available in the vehicle.

[0093] In a third step 33 , third information is received, which characterizes a maintenance goal for maintaining the connection between the communication system and the network during a determined duration.

[0094] In a fourth step 34 , at least one energy saving mode to be assigned to the communication system of the vehicle is determined based on the first information, the second information and the third information.

[0095] In a fifth step 35 , a switch command for switching to the at least one determined energy-saving mode is transmitted to the communication system of the vehicle.

[0096] According to a variant, steps 31 to 35 are repeated to take into account the variations in the electrical consumption of the vehicle 10 , the demands on said electrical consumption and the evolution of the available electrical power.

[0097] Of course, the present invention is not limited to the embodiments described above, but extends to a method for managing communications between a vehicle and a network, and a device configured to implement such a method. The present invention also relates to a method for managing energy in a vehicle, and a device configured to implement such a method.

[0098] The invention also relates to a system comprising one or more vehicles, for example vehicles of the motorized type or more generally a land motorized vehicle, communicating with one or more servers or devices of the network, for example the device 2 .

Claims

1. A communication method for communicating between a communication system of a vehicle (10) and a public land mobile network (100), said vehicle (10) being stationary in a grid of said public land mobile network (100), said communication method being implemented by said public land mobile network (100), said communication method comprising the following steps: - receiving (31) first information characterizing the electrical consumption of the vehicle (10); - receiving (32) second information characterizing the amount of electricity available in the vehicle (10); - receiving (33) third information characterizing a maintenance objective for maintaining the connection between the communication system and the public land mobile network for a determined duration; - determining (34) at least one energy saving mode to be assigned to the communication system of the vehicle (10) based on the first information, the second information and the third information; - transmitting (35) a switching instruction for switching to the at least one determined energy-saving mode to the communication system of the vehicle (10), The determining of at least one energy saving mode comprises selecting an energy saving profile from a plurality of energy saving profiles, each profile of the plurality of energy saving profiles being associated with a set of applications and / or services to be maintained active and having a set of associated communication parameters, the set of associated communication parameters comprising: - frequency of data exchange; and / or - Packet size.

2. The communication method according to claim 1, wherein: The determination of at least one energy saving mode includes selecting a sleep mechanism from a plurality of mechanisms supported by the public land mobile network (100) for putting the communication system of the vehicle (10) to sleep at regular time intervals of determined duration.

3. The communication method according to claim 2, wherein: The multiple mechanisms include: - Energy saving mode mechanism, called PSM; -Discontinuous reception mechanism, called DRX; - Extended discontinuous reception mechanism, called eDRX; -Continuous reception mechanism in connected mode, called CDRX.

4. The communication method according to any one of claims 1 to 3, wherein: The plurality of energy saving profiles includes a profile in which only one or more emergency services remain active.

5. The communication method according to any one of claims 1 to 3, wherein: The selection of an energy saving profile depends on a virtual image of the communication system of the vehicle (10), the virtual image being recorded in the public land mobile network.

6. An apparatus (2) included in a public land mobile network, the apparatus (2) comprising a memory (21) associated with at least one processor (20), the at least one processor being configured to implement the steps of the communication method according to any one of claims 1 to 5.

7. A communication system comprising the apparatus according to claim 6 and at least one vehicle coupled to the public land mobile network via a wireless connection.

8. A computer program product comprising instructions adapted to perform the steps of the communication method according to any one of claims 1 to 5 when the computer program is executed by at least one processor.

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