FR3072845A1 - INTERCELLULAR TRANSFER MANAGEMENT OF A WIRELESS COMMUNICATIONS EQUIPMENT LOCATED IN A VEHICLE - Google Patents

Abstract

The present invention relates to a handover management method of a wireless communications equipment, located on board a vehicle and configured to receive information from a GPS location and navigation system located in the vehicle. The wireless communication equipment obtains from the GPS location and navigation system information relating to the trajectory of the vehicle; estimates the transit times of the vehicle in the cell regions served by the base stations applying for cell reselection, based on the information obtained; and decides to initiate a transfer to a target base station or to maintain the attachment to the current base station, based on the estimated durations.

Description

INTERCELLULAR TRANSFER MANAGEMENT OF EQUIPMENT

WIRELESS COMMUNICATIONS LOCATED IN A VEHICLE

FIELD OF THE INVENTION

The invention relates to the management of handovers within wireless communications systems, and more particularly to the management of transfers implemented by wireless communications equipment located in a vehicle.

BACKGROUND OF THE INVENTION

Over the past 50 years, the average temperature has risen at the fastest rate in history. Global warming occurs when air pollutants such as greenhouse gases are prevented from escaping into space, trapping heat and thereby causing the temperature to rise. In order to reduce (or at least contain) global warming and its catastrophic effect on the planet, regulators around the world have decided to impose strong limits on greenhouse gas emissions.

Automobiles are considered among the main emitters of greenhouse gases, and therefore are particularly concerned by these new legislative frameworks. As such, automakers have been asked to improve the overall energy efficiency of their new models. The reduction of vehicle mass, i.e. the reduction of the overall load of the vehicle which must be powered and accelerated while driving, and the electrification of the vehicle, have been identified as main axes when it comes to reduce greenhouse gas emissions. It is important to note that there is a direct relationship between the amount of power drained from a battery by on-board subsystems in the vehicle and the amount of

C02 released to the atmosphere.

Optimizing the energy consumption of all on-board subsystems is therefore essential, including that of subsystems connected to the wireless communications network, such as the TCU telecommunications unit (according to English “Telematics Control Unit”) based for example on a 4G / 5G modem.

The same energy efficiency objectives are shared by manufacturers of wireless communications equipment, for example smartphone-type mobile terminals incorporating a 4G / 5G modem, as well as by operators of communications networks. Thus, the energy consumption of wireless communication subsystems must be carefully managed.

The present invention aims to provide a method for managing handovers in a wireless communications network which optimizes the idle time of communications equipment.

Wireless communication systems generally deploy numerous access points, called base stations, to provide wireless connectivity to mobile communications equipment: each base station is responsible for the wireless connectivity of mobile equipment located in one or more cellular regions served.

Mobile communications equipment can move from one base station to another as it traverses the wireless communication system. For example, mobile communications equipment can connect to a new base station when it enters the radio environment of a base station whose signal strength and / or quality reaches a specific threshold.

The classic condition for launching a base station reselection is that the signal strength and / or quality from the candidate base station is stronger or better than the signal strength and / or quality from the station current base.

However, basing the base station reselection process only on power and / or quality at the target base station when the latter seems to have a stronger signal than the can lead to a number of problems, for example if signal strength values may be subject to rapid fluctuations when signals are near the threshold.

Consequently, mobile communication equipment can often be required to reselect a back-and-forth base station if the selection mechanism is based solely on the relative signal strength; this unnecessarily consumes both processing time and energy.

In addition, the strength of signals received by a particular mobile communication equipment can also vary rapidly due to movement of that equipment.

In order to optimize the energy consumption of wireless communications equipment connected to a network and located inside a vehicle, for example in an automobile, it is essential to optimize the number of cell reselection operations, and to minimize the processing time devoted by the entities of the communications system to these operations.

SUMMARY OF THE INVENTION

The invention aims to provide a method for managing a handover of wireless communications equipment located on board a vehicle, the wireless communications equipment being configured to receive information from a geolocation system and navigation located in the vehicle, and operating in a network communications system comprising a configured to support comprising plurality of communications equipment without respective cellular regions, the communications equipment without a receiving step, current, cellular;

received from a la information if an infrastructure of wire communications base stations in one or more methods being performed by wire, and comprising from a relative base station a reselection measurement step of the current base station;

signal power this power is below a predefined threshold;

an identification step, information relating to a reselection of candidate cell regions for the target cell-free communications equipment;

a cell-based value, to be selected wire as the step of obtaining, from the des by the region of the geolocation system, a trajectory and navigation, of vehicle information;

a vehicle cell regions;

a relative positions step of determining the candidates with respect to the step of estimating, in the region of information relating to positions of the trajectory of the function of the candidate cells and the trajectory of the vehicle, of the estimated durations of the passages of the vehicle in the candidate cell regions ;

• a step of selecting from the candidate cell regions, a target cell region and a target base station taking charge of the communications of this target cell region;

• a decision step comprising if the estimated duration of passage of the vehicle in the target cellular region is greater than a predetermined minimum duration, a substep for triggering the handover of the mobile communications equipment to the target base station;

otherwise, a substep of maintaining the attachment of the mobile communications equipment to the current base station.

According to preferred embodiments, the invention comprises one or more of the following characteristics which can be used separately or in partial combination with one another or in total combination with one another:

the communications system is an LTE or 5G communications system;

the method further comprises a preliminary step of entering the wireless communications equipment into an operating mode in which it is responsible for initiating the handover, and in which the information relating to a cellular reselection is received by through broadcast messages. This embodiment is particularly advantageous, because it makes it possible to evaluate whether an intercellular transfer is effective or not by the entity which is in charge of initiating it. If the transfer is not deemed to be effective, it will not be initiated, which not only minimizes the use of the resources of the mobile communications equipment, but also the use of the resources of other entities of the communications system.

the information relating to the trajectory of the vehicle includes one or more pieces of information from:

the position of the vehicle;

vehicle travel speed; vehicle traffic conditions;

a route estimate, based on a route planned in the geolocation and navigation system or deduced from the route history;

the step of obtaining information relating to the trajectory of the vehicle is carried out periodically, or as soon as the variation of at least one piece of information is greater than a predetermined value. This embodiment is particularly advantageous if the vehicle V is likely to be subject to variations in the parameters determining its trajectory, for example an automobile, which makes it possible to benefit from the days by the GPS system navigation information set in the event of variation. abrupt information, for example to recalculate

1'itinéraire.

the step of determining the positions of the candidate cell regions is carried out using data previously stored, relating to the geographic positions of the base stations.

The invention also relates to a computer program product downloadable from a communications network and / or recorded on a medium readable by a processor of a computer system, and which comprises instructions which, when executed by the processor of the computer system , entail the implementation of a method as previously described.

The invention also relates to wireless communications equipment able to be located on board a vehicle, and configured to receive information relating to a trajectory of the vehicle from a geolocation and navigation system located on board the vehicle and to operate in a communications system comprising a network infrastructure comprising a plurality of base stations configured to support communications of wireless communications equipment in one or more respective cellular regions, characterized in that it comprises:

a radio frequency transceiver configured to receive from a current base station information relating to cellular reselection;

a measurement module, configured to measure the

power a signal received since current base station and for compare that power at a threshold value predefined T - a module Identification of the cell regions candidates at to be selected through equipment

wireless communications as a target cell region, based on cell reselection information;

a module for obtaining information relating to a trajectory of the vehicle, from the geolocation and navigation system;

a module for determining the positions of the candidate cellular regions, relative to the trajectory of the vehicle;

an estimation module, as a function of the positions of the cellular regions relating to the cellular vehicle candidate station and of the trajectory information, in the regions a module of selection cell durations, estimated for the candidate passages;

among the candidate regions, a target base taking this target cell region;

target cellular region and one in charge of the communications of a decision module, configured to initiate the mobile transfer towards passage of the intercellular superior of the vehicle station in a period of time maintaining the attachment base of the target communications equipment the target estimated predetermined minimum cell region duration is and for mobile communications equipment at the current base station if the estimated duration less than or equal to the predetermined minimum duration.

East

In a preferred embodiment wireless communications mode, the equipment is configured to be integrated into the vehicle, and to receive the vehicle trajectory and integrated navigation information.

Alternatively, wire is integrated into (smartphone) being able in the vehicle, from one to one relating to the from a geolocation system to the vehicle.

be the (smartphone) understanding and navigating.

According to other wireless communications navigation do not make communications equipment without mobile communications terminal used by a user traveling mobile terminal further modes and the part of the implementation system, geolocation communications

The geolocation system and the same system equipment, but they are configured to communicate by an interface allowing the transmission of information relating to the trajectory of the vehicle from the geolocation and navigation system to the wireless communications equipment. Such a configuration can be obtained for example by using wireless communications equipment integrated into a vehicle and a geolocation and navigation system forming part of a mobile terminal such as a smartphone or a dedicated device.

Another object of the invention relates to a vehicle comprising wireless communications equipment as previously described.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 schematically represents an example of a communications system in which the invention can be implemented.

FIG. 2 schematically represents a wireless communications equipment able to implement the invention.

FIG. 3 represents an example of the trajectory of a vehicle in which is located wireless communications equipment implementing an embodiment of the invention.

FIG. 4 schematically represents the steps of a method for managing a handover, according to an embodiment of the invention.

DETAILED DESCRIPTION OF THE INVENTION

In Figure 1 is shown a communications system in which the invention can be implemented. In the illustrated embodiment, the system is of the LTE type and comprises a part of the so-called core network (LTE Core Network), a part of the so-called access network and one or more mobile wireless communication devices.

Such mobile equipment TCU (Telematics Control Unit) can be a telecommunications unit provided with an LTE modem, integrated in a vehicle V. This vehicle V is also provided with a geolocation and GPS navigation system. The integrated telecommunications unit TCU is configured to receive information from the geolocation and GPS navigation system.

Alternatively, a UE mobile equipment can be a user's mobile phone, for example a smartphone, also provided with a geolocation and GPS navigation system. The mobile phone UE has an application dedicated to the implementation of the invention, and the module in charge of wireless communications is configured to receive information from the geolocation and GPS navigation system.

In Figure 2 is shown schematically a wireless communications equipment TCU, UE capable of being located on board a vehicle V, and configured to receive information relating to a trajectory T of the vehicle V from a geolocation and GPS navigation system located on board vehicle V and for operating in a communications system comprising a network infrastructure comprising a plurality of base stations eNB j. The wireless communications equipment TCU, UE includes a processor P, memories MEMp, MEMd, for storing computer programs and data, a radio frequency RF transceiver configured to receive from a current base station eNBc, information relating to a cellular reselection Ir; a measurement module, configured to measure the power Srxlev of a signal received from the current base station eNBc and to compare this power Srxlev with a predefined threshold value Pmin; an IF interface for communication with a geolocation and GPS navigation system. The wireless communications equipment also includes specialized modules, which in certain embodiments can be implemented by electronic circuits cooperating with software modules which use the processor P and the memories MEMp, MEMd:

a module for identifying the candidate cell regions RCCj to be selected by wireless communications TCU, UE as the target cell region equipment RCt, as a function of the information relating to a cellular reselection Ir a module for obtaining the information

It relating to a trajectory T of the vehicle

V, from the geolocation and GPS navigation system;

a module for determining the positions of the candidate cellular regions RCCj, with respect to the trajectory T of the vehicle V;

a module for estimating, as a function of the positions of the candidate cellular regions RCCj and of information It relating to the trajectory T, of the estimated durations Dj of the passages of the vehicle V in the candidate cellular regions RCCj;

a module for selecting, from the candidate cell regions RCCj, a target cell region RCt and a target base station eNBt taking charge of the communications of this target cell region RCt;

a decision module, configured to trigger the handover of the mobile communications equipment TCU, UE to the target base station eNBt, if the estimated duration Dt of passage of the vehicle V in the target cellular region RCt is greater than a duration predetermined minimum

Dmin, and to maintain the attachment of the mobile communications equipment TCU, UE to the current base station eNBc if the estimated duration Dt is less than or equal to the predetermined minimum duration Dmin.

The wireless communications equipment TCU, UE, as well as other mobile terminals UEj, whether or not adapted to implement the invention, are connected to the core network via an LTE access network. This LTE access network includes base stations eNBj (abbreviation of the English terms evolved Node B). Each base station eNBj is configured to support communications from wireless communications equipment TCU, UE, UEj in one or more respective cellular regions RCj.

The LTE access network also includes an MME mobility management entity (abbreviation of English terms

Mobility Management Entity), which is the primary control node for the LTE access network.

The management entity MME processes the signaling between the mobile equipment TCU, UE, UEj and the core network (LTE Core Network). The MME management entity is also responsible for the monitoring and paging procedure, but also the management of mobility in idle mode according to English terminology) in certain cases.

Connection to the network of TCU wireless communications equipment,

EU

UEj, is done via an eNBj base station, which serves a cellular region

RC j.

When connected to the network, mobile equipment

TCU

UE, UEj receives from the MME mobility management entity a cellular list which constitutes a tracking area (or Tracking Area according to English terminology) in which the mobile equipment TCU, UE, UEj can move without having to perform a update of its location with the MME mobility management entity.

As long as a mobile wireless communications equipment TCU, UE, UEj remains within the same cellular region RCj, the communications equipment TCU, UE remains connected or attached to the charging station of the communications likely the mobile terminals located in this base eNBj, which is being carried out by cell region RCj.

During its movement, the mobile equipment may be required to change the cellular region and therefore to connect to another base station. If the new base station eNBi serves a cellular region RCi which is not part of its list TA corresponding to its current monitoring area, the mobile equipment TCU, UE, UEj must perform, in addition to the selection of the new station eNBi base, an update of its location with the MME mobility management entity.

The selection of a new base station and the possible update of the TA list is done through control messages, exchanged between the above-mentioned entities, which requires resources of time, energy and bandwidth for transmission. and processing these messages. Optimizing these exchanges by using information It relating to a trajectory T of the vehicle V can lead to significant savings in resources, as will be explained below.

In the embodiment described, that is to say in the case of an LTE system, the exchanges are carried out either on the initiative of the network, or on the initiative of the mobile equipment, depending on the state in which the mobile equipment is located. In particular, the mobility of a wireless communications equipment in standby mode is based on the measurements made by this equipment, and on its decisions consisting in carrying out a cell reselection or not. The mobility of a wireless communications device in standby mode is monitored by the management entity MME at the level of the TA lists.

Thus, when a wireless communication equipment moves away from the current base station eNBc and enters an area where the signal strength received from base stations serving the neighboring cellular regions is sufficiently strong, the equipment can trigger handover to a new target base station eNBt.

If the new target cell region RCt served by the target base station eNBt is part of the original TA list (supplied to the mobile equipment by the mobility management entity MME), no additional action by the mobile equipment is required. However, if the new RCt target cell region is not part of the original TA list, an additional procedure for updating TAU (abbreviation for English terms Tracking Area Update) is triggered by the communications equipment. wireless, to inform the network of its movement.

The wireless communications equipment TCU, UE is capable of being located on board a vehicle V in which is also located a geolocation and GPS navigation system.

The wireless communications equipment TCU, UE is configured to receive information It relating to the trajectory T of the vehicle V from the geolocation and GPS navigation system. This information It can include one or more pieces of information Ei among: the position, the speed of movement, and the traffic conditions of the vehicle, a route estimate according to a route planned in the geolocation and navigation system. GPS, or deducted from

the history of trips, and information of dated and hour. So the position future of vehicle V, and therefore of

TCU, UE communications equipment located in this vehicle, can be predicted from its current position, travel speed, anticipated route of the vehicle and traffic conditions.

As previously mentioned, in this example the wireless communication equipment implementing the invention TCU, UE, is in standby mode, during which waking phases are carried out periodically, in order to obtain from the current base station information about a possible cell reselection and deciding whether a handover should be initiated or not. During these wake-up phases, the following steps are carried out by the wireless communications equipment TCU, UE.

In a reception step E10, the wireless communications equipment TCU, UE receives from a current base station eNBc, information relating to a cellular reselection Ir, for example threshold values for the power and / or the quality of the signals received, parameters for the classification of neighboring base stations for possible handover. This information is included in messages broadcast by the current base station eNBc in "broadcast" mode.

Then, in a measurement step E20, the power Srxlev of the signal received from the current base station eNBc is measured.

If this power Srxlev is less than a predefined threshold value Pmin, an identification step E30 is executed of the candidate cell regions RCCj to be selected by the wireless communications equipment TCU, UE as the target cell region RCt. This identification is made as a function of the information relating to a cellular reselection Ir received at the step

In a step of obtaining E40, the wireless communications equipment TCU, UE, obtains from the geolocation and GPS navigation system, information lt relating to the trajectory of the vehicle V, in particular its current position, its speed of movement , and possibly the traffic conditions, as well as an estimate of the rest of its trajectory. It should be noted that this information is updated by the geolocation and GPS navigation system for its own needs, so the reuse of these results by the wireless communications equipment TCU, UE leads to an optimization of the management of the intercellular transfers. , with a minimum consumption of energy resources and processing time.

Then the wireless communications equipment TCU, UE performs a step E50 of determining the positions of the candidate cell regions RCCj identified in step E30, with respect to the path T of the vehicle V. This determination can be carried out using data previously stored, relating to the geographic positions of the eNBj base stations and the cellular regions served by these base stations.

This data can be provided by operators of telecommunications systems, for example by providing maps which can be used by the geolocation and GPS navigation system.

Alternatively, these maps can be obtained by browsing the roads to map base stations.

Starting from the geographic positions of the candidate cellular regions RCCj, and from information such as the position, the speed and the anticipated trajectory of the vehicle V, the wireless communications equipment TCU, UE performs a step E60 of estimating the durations Dj of the passages of vehicle V in candidate cell regions RCCj.

Then the TCU wireless communications equipment,

UE executes a step of selection E70, among the candidate cellular regions RCCj, of a target cellular region RCt and of a target base station eNBt taking charge of the communications of this target cellular region RCt.

The wireless communications equipment TCU, UE decides, during a decision step E80, to perform or not a handover to the target base station eNBt, as a function of the estimated duration Dt of passage of the vehicle V in the target cell region RCt, as follows:

- if this estimated duration Dt is greater than a predetermined minimum duration Dmin, a handover of the mobile communications equipment TCU, UE to the target base station eNBt is triggered by the wireless communications equipment TCU, UE, during an E100 triggering substep; it should be noted that in this case, an update of the location of the equipment is likely to be carried out with the mobility management entity MME, if the target base station eNBt and current base station eNBc do not belong to the same TA list.

- Otherwise, the mobile communications equipment TCU, UE maintains its attachment to the current base station eNBc during a holding substep E110.

The execution of this maintenance sub-step is particularly advantageous in the embodiment described, since the mobile communications equipment TCU, UE is in standby mode (or idle in English) and it is solely responsible for the decision to connect (or not) to a particular base station.

The trajectory T followed by a vehicle V provided with wireless communication equipment TCU, UE implementing an embodiment of the invention is illustrated in figure

3.

The illustrated trajectory is located in a geographic area including

- the regions cell numbered # 1.1, # 1.2, # 1.3, who make part a TA1 list corresponding to a first zoned feedback r - the regions cell numbered # 2.1, # 2.2, # 2.3, who make part a TA2 list corresponding to a second zoned feedback r - the regions cell numbered # 3.1, # 3.2, # 3.3, who make part a TA3 list corresponding to a third zoned feedback

The trajectory T crosses in order the cellular regions numbered # 1.2, # 1.3, # 2.2, # 3.1 and # 2.3, passing successively through points 1, 2, 3, 4, 5 and 6.

The management of intercellular transfers according to an embodiment of the invention will be explained and compared to a conventional management of transfers, with reference to FIG. 2 and to the table below.

It is assumed that trajectory T is also followed by conventional mobile equipment UEj. In the following of this description, the wireless communications equipment TCU, UE implementing an embodiment of the invention will be called the equipment TCU, UE, and the conventional mobile equipment UEj will be called the equipment UEj.

The behavior of the equipment UEj will not be described in detail, since it conforms to the methods well known in the field of wireless communications.

References to the process steps made in the rest of this example relate only to the TCU, UE equipment.

The table illustrates for each crossing point 1 to 6 5 the decision taken by the conventional equipment UEj and the decision taken by the equipment TCU, UE, during the execution of the decision step E80.

Management of classic intercellular transfers by UE equipment j Management of intercellular transfers by TCU equipment, UE Position Cell reselection TA update Cell reselection TA update 1 No No No No 2 No No No No 3 Yes: UEj selects the base station serving cell # 2.2 Yes, because the cell # 2.2 belongs to the list TA2 Yes: TCU, UE selects the base station serving cell # 2.2 Yes because cell # 2.2 belongs to the TA2 list 4 Yes: UEj selects the base station serving cell # 3.1 Yes, because cell 3.1 belongs to the list TA3 No: the time taken for the vehicle to pass through cell 3.1 is below the threshold. TCU, UE remains attached to the base station serving cell # 2.2 No 5 Yes: UEj selects the base station serving cell # 2.3 Yes, because cell # 2.2 belongs to the list TA2 Yes: TCU, UE select cell # 2.3 No

6 No No No No

During the passages through points 1 and 2, the equipment UEj and the equipment of TCU, UE, receive information information Ir relating to a cellular reselection from the base station serving the cellular region # 1.3. This information is sent in broadcast mode.

It is assumed that the information Ir, received in step E10 and / or the results of the measurements carried out in step E20 do not justify, according to criteria well known to those skilled in the art, an intercellular transfer. Thus, the equipment UEj and TCU, UE have a similar behavior in this case.

When passing through point 3, it is assumed that the information Ir relating to a cellular reselection, received in the reception step E10 and / or the results of the signal power measurements carried out in the measurement step E20 justify a possible handover to the base station serving cell region # 2.2, belonging to the TA2 list. The conventional equipment UEj performs this transfer, as well as the updating of its location with the mobility management entity MME, because for this case there is a change of list TA.

The equipment TCU, UE selects in the selection step E70 the base station serving the cell region # 2.2 as the target base station eNBt. Cell region # 2.2 belongs to the TA2 list. It is assumed that the duration of passage through the cell region # 2.2 estimated in step E60 is greater than the predetermined minimum duration Dmin. In this case, during the decision step E80, the triggering substep E100 of handover to the target base station is executed. Since the new cell region # 2.2 and the old cell region # 1.3 do not belong to the same TA list, an update of the location of the wireless communications equipment must

to be done with the entity of management MME mobility. In that case also the amenities UEj and TCU, EU have a behaviour similar. then of the passage by point 4, we Assumed that

Ir information relating to a cellular reselection, received at the reception step E10 and / or the results of the signal strength measurements carried out at the measurement step E20 justify a possible handover to the base station serving the cellular region # 3.1 , belonging to the TA3 list. The conventional equipment UEj performs this transfer, as well as updating its location with the entity

MME mobility management. These operations require of the time resources, energy and bandwidth for all the entities concerned, to know 1 ' UEj equipment, but also the current base stations eNBC and target eNBT, and the entity of mobility management MRS . The equipment TCU EU selected at the stage of E70 selection station of base serving the region

cell # 3.1 as a base station as an eNBt target. It is assumed that the duration of passage through cell region # 3.1 estimated in step E60 is less than the predetermined minimum duration

Dmin. In this case, during the decision step E80, the sub-step E110 of the attachment of the equipment TCU, UE to the current base station is executed and consequently no update of the location of the Wireless communications equipment is only carried out with the MME mobility management entity.

In this case, the equipment UEj and TCU, UE have a different behavior, which allows the equipment TCU, UE to avoid a consumer intercellular transfer of resources for all the entities concerned.

When passing through point 5, it is assumed that the information Ir relating to a cellular reselection, received in the reception step E10 and / or the results of the signal power measurements carried out in the measurement step E20 justify a possible handover to the base station serving cell region # 2.3, belonging to the TA2 list. The UEj equipment performs this transfer, as well as updating its location with the MME mobility management entity, because in this case there is again a change of list

YOUR.

The equipment

TCU, UE selects in the selection step E70 the base station serving the cell region # 2.3 as the target base station eNBt. It is assumed that the duration of passage through cell region # 2.3 estimated at

1'étape

E60 is greater than the predetermined minimum duration Dmin.

Thus, during the decision step executed the triggering sub-step

E100 handover to target base station.

Like the new cell region # 2.3 and

The old cell region # 2.2 belong to the same list

TA, an update of the location with the MME mobility management entity is not necessary. In this equipment UEj and TCU, UE have a different behavior, because even if the handover is carried out in

two cases, the setting up to date the location of 1'équipement near 1'entité Management of MME mobility East avoided for 1'équipement TCU EU, thanks at 1'application of process of

handover management when passing through point 4.

In a preferred embodiment of the invention, the step E40 of obtaining information It40 relating to the trajectory T of the vehicle V is executed periodically, or as soon as the variation of at least one information element Ei is greater than a predetermined value. Thanks to the presence of the geolocation and GPS navigation system on board the vehicle in which the TCU, UE wireless communications equipment is located, a pooling of resources is obtained between these two entities. Indeed, a change in traffic conditions and / or a change in the trajectory of the vehicle can thus be detected as quickly as possible, which allows a more precise estimation of the durations of passage of the vehicle in the cellular regions, and an effective decision. concerning the initiation of a handover or the maintenance of the connection to the current base station.

Of course, the present invention is not limited to the examples and to the embodiment described and shown, but it is susceptible of numerous variants accessible to a person skilled in the art.

Claims (9)

1. Method for managing a handover of wireless communications equipment (TCU, UE) located on board a vehicle (V), the wireless communications equipment (TCU, UE) being configured to receive information from a geolocation and navigation system (GPS) located in the vehicle (V), and to operate in a communications system comprising a network infrastructure comprising a plurality of base stations (eNBj) configured to support communications of wireless communications equipment (TCU, UE, UEi) in one or more respective cellular regions (RCj), the method being performed by wireless communications equipment (TCU, UE), and comprising: a step of receiving (E10), from a current base station (eNBc), information relating to a cellular reselection (Ir); a step of measuring (E20) the power (Srxlev) of a signal received from the current base station (eNBc); if this power (Srxlev) is less than a predefined threshold value (Pmin); An identification step (E30), as a function of the information relating to a cellular reselection (Ir), of the candidate cellular regions (RCCj) to be selected by the wireless communications equipment (TCU, UE) as a region target cell (RCt); • a step for obtaining (E40), from the geolocation and navigation system (GPS), information (It) relating to a trajectory (T) of the vehicle (V); • a step of determining (E50) the positions of the candidate cell regions (RCCj) with respect to • a step of estimating (E60), as a function of the positions of the candidate cell regions (RCCj) and of the vehicle information, of the vehicle passages (V) in the candidate cell regions (RCCj) • a selection step (E70) among the candidate cell regions (RCCj), of a target cell region (RCt) and of a target base station (eNBt) taking loads communications for this target cell region (RCt); if the estimated duration (Dt) of passage of the vehicle (V) in the target cellular region (RCt) is greater than a predetermined minimum duration (Dmin), a triggering sub-step (E100) of the intercellular transfer of the equipment of mobile communications (TCU, UE) to the station otherwise, a substep for maintaining (E110) the attachment of the current basic communications equipment (eNBc). 2. Method according to the preceding claim, wherein the communications system is an LTE or 5G communications system. 3. Method according to the preceding claim, further comprising a preliminary step of entering (E5) the wireless communications equipment (TCU, UE) in an operating mode in which it is responsible for initiating the handover. , and in which the information (Ir) relating to a cellular reselection is received via the broadcast messages. 4. Method according to one of the preceding claims, relating to the trajectory (T) of the vehicle (V) comprises one or more pieces of information (Ei) from: the position of the vehicle the speed of movement of the vehicle; vehicle traffic conditions; a route estimate, based on a route planned in the geolocation and navigation system (GPS) or deduced from the history of the journeys made. Method according to the preceding claim, in which the step of obtaining the vehicle (V) is carried out periodically, or as soon as the variation of at least one piece of information (Ei) is greater than a predetermined value. 6. Method according to one of the preceding claims, in which the step of determining (E50) the candidate cell regions (RCCj) is using data previously stored, positions of the done in on to the positions Computer program comprising instructions which, when executed in computer, give rise to one of the claims through a the setting 1 to 6. processor of a system implementing a method according to 8. Wireless communications equipment (EU, TCU) capable of being located on board a vehicle (V), and configured to receive information relating to a trajectory (T) of the vehicle (V) from a geolocation system and navigation system (GPS) located on board the vehicle (V) and for operating in a communications system comprising a network infrastructure comprising a plurality of base stations (eNBj) configured to support communications from wireless communications equipment ( TCU, UE, UEi) in one or more respective cellular regions (RCj), characterized in that it comprises: - a transmitter receiver (RF) of radio frequency, configured for receive from a station basic current (eNBc), of the information related to a reselection cell (Ir) r - a measurement module, configured to measure the power (Srxlev) of a signal received from the current base station (eNBc) and to compare this power (Srxlev) with a predefined threshold value (Pmin); a module for identifying the candidate cell regions (RCCj) to be selected by the wireless communications equipment (TCU, UE) as a target cell region (RCt), as a function of the information relating to a cellular reselection (Ir) ; a module for obtaining information (It) relating to a trajectory (T) of the vehicle (V), from the geolocation and navigation system (GPS); a module for determining the positions of the candidate cell regions (RCCj), relative to the trajectory (T) of the vehicle (V); an estimation module, as a function of the candidate cell regions positions relative to the candidate (RCCj) (RCCj) cell (RCt) and vehicle (V) passages in a candidate module, a selection station, and cell region information among regions (RCCj), of a target cell region responsible for communications of this target cell region (RCt); a decision module, configured to initiate the handover of 1 communications equipment the base station estimated time (Dt) of passage of the vehicle (V) in the target cellular region (RCt) is greater than a predetermined minimum duration (Dmin) , and to maintain the attachment of the current basic communications equipment (eNBc) if the estimated duration (Dt) is less than or equal to the predetermined minimum duration (Dmin). 9. Wireless communications equipment (TCU) according to the preceding claim, characterized in that it is configured to be integrated into a vehicle (V), and to receive information relating to the vehicle trajectory (V) from a geolocation system and navigation (GPS) built into the vehicle (V). 10. Wireless communications equipment (EU) according to claim 8, characterized in that it is integrated into a mobile communications terminal (smartphone) which can be used by a user traveling in the vehicle (V), the mobile terminal of communications (smartphone) also including the geolocation and navigation system (GPS). 11. Vehicle (V) comprising communications equipment (TCU) according to claim 9.