EP4559278A1 - Procédé et dispositif de redéploiement automatique de la couverture géographique d'un réseau de télécommunication sans fil - Google Patents
Procédé et dispositif de redéploiement automatique de la couverture géographique d'un réseau de télécommunication sans filInfo
- Publication number
- EP4559278A1 EP4559278A1 EP23741737.3A EP23741737A EP4559278A1 EP 4559278 A1 EP4559278 A1 EP 4559278A1 EP 23741737 A EP23741737 A EP 23741737A EP 4559278 A1 EP4559278 A1 EP 4559278A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wireless
- base station
- mobile
- vmssf
- vehicle equipped
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/18—Network planning tools
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/18502—Airborne stations
- H04B7/18504—Aircraft used as relay or high altitude atmospheric platform
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/40—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks using virtualisation of network functions or resources, e.g. SDN or NFV entities
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
- H04L43/0811—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking connectivity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15507—Relay station based processing for cell extension or control of coverage area
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/44—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/005—Moving wireless networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
Definitions
- the invention is in the technical field of telecommunications networks, and relates more particularly to a method for automatically redeploying the geographic coverage of a wireless telecommunications network interconnecting a set of mobile wireless equipment to a base back.
- the technical problem addressed by the present invention is that of the loss or degradation of the quality of wireless connectivity between a set of mobile wireless equipment (EM) and a rear base (BA). , during the geographical movement of these EM over time. Indeed, each of these EMs moving geographically over time, some may leave the wireless coverage area offered by the network as initially deployed, then losing connectivity with the BA.
- EM mobile wireless equipment
- BA rear base
- the local density of EMs can also vary over time, and can trigger an overload of certain parts of the wireless network, and therefore a potential degradation of the quality of service (QoS). for certain EMs, or on the contrary may reveal geographical areas covered by the wireless network when no EMs are present in this area, thus making the network coverage inappropriate with regard to the needs of the EMs.
- QoS quality of service
- the process is based on a set of Robotic Communication Relays Autonomous (RCRA) capable of moving autonomously along the trajectory followed by the VM and capable of forming a linear mesh / multi-hop wireless communication network between the VM and the rear base (along the trajectory of the VM).
- RCRA Robotic Communication Relays Autonomous
- the method makes it possible to automatically control the positioning of each of the RCRAs along the trajectory of the VM, as well as the addition if necessary of a new RCRA, so as to preserve wireless connectivity between the VM and the BA , and to ensure that it is of sufficient quality to bidirectionally transport the data required (by the mission of the VM) between the VM and the BA despite the movement of the VM.
- This process allows the VM to remain connected to the BA even in the event of loss of direct wireless connectivity between the VM and the BA (for example at the limit of radio signal coverage), via the automatic deployment of RCRAs to preserve this connectivity. Thanks to this process, the VM can travel greater distances or penetrate more hostile environments (e.g.
- This process also includes a fallback mode allowing, when the VM turns back along its initial trajectory, an automatic fallback of the RCRAs along this same trajectory and a progressive dismantling of the mesh / multi-hop network formed by the RCRAs via the withdrawal of the RCRAs of the mesh network once they are no longer necessary to preserve quality connectivity between the VM and the BA.
- the present invention responds to this need by proposing a solution making it possible to automatically redeploy the geographical coverage of a wireless telecommunications network serving a set of mobile equipment connected to a rear base.
- An object of the present invention is a method for automatically redeploying the geographical coverage of a wireless telecommunications network interconnecting a set of wireless mobile equipment (EM) to a rear base (BA).
- EM wireless mobile equipment
- BA rear base
- the method of the invention makes it possible to automatically redeploy (i.e. without human intervention) the geographical coverage of a wireless telecommunications network, with a view to maintaining quality connectivity at all times between each of the mobile devices and a rear base despite the geographical movement of this mobile equipment over time.
- the method of the invention also makes it possible to maintain quality connectivity between the different mobile equipment of the same assembly despite their movements, by routing communications via the rear base.
- the method of the invention also makes it possible, despite the movements of the mobile equipment, to maintain quality connectivity between each of the mobile equipment of the same set and a rear network, that is to say a third-party network connected to a rear base, by routing communications via the rear base.
- the solution is based on an innovative network architecture consisting of a set of mobile vehicles equipped with a wireless base station (VMSSF) responsible for providing wireless network coverage to the various mobile equipment (EM) , each of the VMSSF being connected to the BA via a wireless link, either directly, either through one or more mobile wireless relays, these relays being able to move autonomously to maintain connectivity between a VMSSF and the BA at all times.
- VMSSF wireless base station
- EM mobile equipment
- the method of the invention is based on a set of mobile vehicles each equipped with a wireless base station and noted (VMSSF), each mobile vehicle of this type being in charge of provide wireless network coverage to a set of mobile equipment, each of the VMSSF being connected to a common rear base via a wireless link, either directly or through one or more mobile wireless relays ( RCRA).
- VMSSF wireless base station and noted
- RCRA mobile wireless relays
- the RCRA relays are able to move autonomously to maintain connectivity at all times between a VMSSF mobile vehicle and the rear base according to a method described in the aforementioned patent application.
- the method of the present invention makes it possible to automatically determine whether the deployment of a VMSSF is required in a given area, to define the position where to deploy this VMSSF and to manage the automatic deployment of the VMSSF at this position in view. to provide wireless network connectivity in this area or to improve connectivity in this area.
- the method of the invention also makes it possible to automatically determine that a VMSSF is no longer useful in a given zone and therefore to manage its repatriation to the rear base, with a view to a possible future redeployment to another geographical area.
- the method also makes it possible to trigger a possible repatriation of a VMSSF already deployed, thus freeing up new resources, to allow the deployment of a VMSSF in a new targeted area.
- the invention implements a method based on the use of a single movable rear base in order to maintain the wireless network connectivity between mobile equipment and the backend network despite moving mobile equipment over long distances.
- the invention implements a method based on the use of two mobile rear bases in order to maintain connectivity of the wireless network between the mobile equipment and the rear network despite the movement mobile equipment over long distances.
- the areas of industrial application of the invention are multiple.
- the invention is applicable in all scenarios where wireless network coverage must be provided to a set of mobile equipment moving in an environment, potentially over long distances, and where a fixed communications infrastructure usable by the mobile equipment does not exist.
- the invention responds to this need by making it possible to automatically deploy (without human intervention) temporary network coverage in the environment where the mobile equipment operates, this network coverage itself being self-reconfigurable in order to offer at all times the network connectivity required by mobile equipment while minimizing the necessary resources.
- the network coverage thus provided by the solution therefore has the characteristic of being itself mobile, and with variable coverage/extent/geometry.
- Security missions such as the surveillance of an area (border, etc.) by a set of mobile responders.
- Industrial missions such as for example providing temporary wireless network coverage with self-reconfigurable coverage on a construction site (e.g. constantly evolving definition) or for the dismantling of a critical installation (nuclear site).
- a method for automatically redeploying the geographical coverage of a wireless telecommunications network interconnecting a plurality of wireless mobile equipment at a common rear base comprising steps consists in :
- each mobile vehicle equipped with a wireless base station being connected to said rear base via a wireless link, and being positioned at a geographical position offering wireless network coverage over said sub-zone to a set of mobile wireless equipment;
- the method can operate according to alternative or combined embodiments.
- the step of determining the loss or degradation of quality of wireless network connectivity between a set of mobile wireless equipment and the rear base comprises steps consisting of monitoring in a manner continues (a) attaching the mobile equipment of each set of mobile equipment to the mobile vehicle equipped with a wireless base station to which the set is attached, (b) locating each of the mobile equipment and (c) the risk of overloading the wireless cells of mobile vehicles equipped with a wireless base station.
- the step of monitoring the parameter (a) of attachment of mobile equipment consists of detecting when mobile equipment is no longer under the wireless network coverage of any equipped mobile vehicle. of a deployed wireless base station, and reconfiguring the wireless network.
- the step of reconfiguring the wireless network comprises steps consisting of:
- the step of monitoring the parameter (a) of attachment of mobile equipment consists of detecting when a mobile vehicle equipped with a wireless base station is not used, and of reconfiguring the wireless network.
- the step of reconfiguring the wireless network comprises steps consisting of:
- the step of monitoring the parameter (c) of risk of wireless cell overload consists of determining the location of the mobile vehicle equipped with a wireless base station having issued a notification risk of overload, and to reconfigure the wireless network.
- the step of reconfiguring the wireless network comprises steps consisting of: - define a geographical position near the location of the mobile vehicle equipped with a wireless base station having issued a notification of risk of overload, to deploy a new mobile vehicle equipped with a wireless base station;
- the method may further comprise steps consisting of determining that a mobile vehicle equipped with a wireless base station is no longer useful in a given area and repatriating it to the rear base.
- the method may further comprise steps consisting of determining a new geographical position for the rear base and moving said rear base to the new geographical position.
- the method may further comprise steps consisting of determining a geographical position for a second rear base, moving said second rear base towards the geographical position, deploying a new wireless network interconnecting the plurality of wireless mobile equipment wire to said second rear base.
- the invention also relates to a device comprising means for implementing the steps of the method of the invention.
- the mobile vehicle equipped with a wireless base station is a land or air or amphibious or aquatic vehicle, said vehicle being remotely piloted or self-piloted (without human intervention).
- the wireless communication network is implemented according to an SDN “Software Defined Networking” oriented architecture comprising an SDN controller having a North Interface and a South Interface, placed in place at a central system (at a rear base or a server connected to the rear network).
- the SDN controller is able to control via its South Interface the configurations of SDN equipment made up of the rear base(s), the mobile vehicle(s) and all of the relays, and able to implement in the form of an SDN Service via its North Interface the steps of the method of the invention.
- the invention also relates to a computer program product which comprises code instructions making it possible to carry out the steps of the method of the invention, when the program is executed on a computer.
- FIG. 1 illustrates an application environment of the invention, implementing several mobile vehicles equipped with a wireless base station (VMSSF) connected to a rear base (BA), offering wireless network coverage to a plurality mobile wireless equipment (EM);
- VMSSF wireless base station
- BA rear base
- EM mobile wireless equipment
- FIG. 2 is a flowchart of the steps carried out for an initial deployment of a wireless network in the context of the invention
- FIG. 3 is a flowchart of the general steps carried out to trigger the automatic redeployment of the wireless network in the context of the invention
- FIG. 4 is a flowchart of the steps carried out to trigger the automatic redeployment of the wireless network in one embodiment
- FIG. 5 is a flowchart of the steps carried out to trigger the automatic redeployment of the wireless network in one embodiment
- FIG. 6 is a flowchart of the steps carried out to trigger the automatic redeployment of the wireless network in one embodiment
- FIG. 7 is a flowchart of the steps carried out by the method of the invention in an embodiment with movement of a rear base
- FIG. 8 is a flowchart of the steps carried out by the method of the invention in another embodiment with movement of two rear bases;
- FIG. 1 illustrates an environment 100 making it possible to implement the invention, on the example of three mobile vehicles equipped with a wireless base station (VMSSF: 104-1, 104-2, 104-3 ) connected to the same rear base (BA: 102), either directly or via autonomous robotic communication relays (RCRA: 108).
- VMSSF wireless base station
- Each mobile vehicle equipped with a wireless base station (VMSSF) provides wireless network coverage to a plurality or set of mobile wireless equipment (EM: 106-1, 106-2, 106-3) .
- EM mobile wireless equipment
- a mobile vehicle equipped with a wireless base station is characterized by the following elements:
- a VMSSF is a vehicle remotely operated automatically (i.e. without human intervention) from the rear base (BA), or from a server located in a rear network 110 connected to the BA.
- the VMSSF can thus be automatically repositioned at a given geographic point, for example by indicating the geographic coordinates of this targeted point or even indicating a trajectory to follow.
- a VMSSF is equipped with a wireless base station allowing it to provide wireless network connectivity in a geographical area close to its location.
- Any type of wireless transmission technology can be used for this wireless network coverage offered by the VMSSF, such as for example radio transmissions in any type of RF band (WiFi, 4G, 5G, etc.), transmissions on the visible part of the electromagnetic spectrum (for example LiFi transmissions) or even acoustic transmissions (underwater).
- a VMSSF (as well as the rear base) can be configured to implement a method making it possible to establish and maintain a quality wireless link between the BA and the VMSSF when connectivity direct wireless between the two can no longer be assured.
- This process which may for example be in accordance with that described in the Applicant's aforementioned patent application, then makes it possible to maintain connectivity between the VMSSF and the BA through one or more mobile wireless relays (RCRA) able to move autonomously along the trajectory of the VMSSF.
- RCRA mobile wireless relays
- any type of wireless transmission technology can be used between the VMSSF and the BA such as for example radio transmissions in any type of RF band (for example an ad-hoc WiFi transmission), transmissions on the visible part of the electromagnetic spectrum (for example LiFi transmissions) or even acoustic transmissions (for example underwater).
- radio transmissions in any type of RF band for example an ad-hoc WiFi transmission
- transmissions on the visible part of the electromagnetic spectrum for example LiFi transmissions
- acoustic transmissions for example underwater.
- the implementation of such a method remains optional in the sense that it is not necessary as long as the VMSSF and the BA remain connected to each other via a wireless connection.
- -direct wire offering sufficient range to cover their relative distances.
- a rear base can take different forms such as for example:
- a fixed or mobile server for example deployed in a vehicle of any type (a truck for example).
- the BA can be connected to a rear network via any type of transmission technology (for example via a satellite link).
- the BA is typically associated with a “storage area” that can accommodate a set of VMSSF for their future deployment in the field to deploy the wireless network.
- the BA can be positioned on a truck (as illustrated in Figure 1) and the storage area can be a platform/trailer associated with the truck.
- VMSSFs are stored in the storage area, the wireless cells associated with these VMSSFs are deactivated.
- the same storage area can accommodate VMSSF and RCRAs.
- FIG. 2 is a flowchart of the steps 200 carried out for an initial deployment of a wireless communication network in the context of the invention.
- the wireless network is deployed to cover a predefined initial geographic area, according to the steps consisting of:
- Step 202 Define an initial geographical area in which the wireless network must be deployed in such a way that all of the EMs which must be served by the wireless network are initially located in this geographical area. It is then assumed that the initial locations of each of the EMs are known.
- Step 204 Partition the initial geographical area into multiple sub-areas, each geographic sub-area being to be covered by a separate VMSSF.
- the size of each sub-zone can be defined on the basis of the maximum radio range achievable by the wireless base station with which the VMSSF is equipped, taking into account the wireless propagation conditions specific to the targeted sub-zone.
- Step 206 Define the location of each of the VMSSF in charge of a sub-zone. Typically this location can be defined for example as the central point of the sub-zone in the hypothesis where the VMSSF is equipped with a wireless base station ensuring omnidirectional coverage (by being equipped with an omnidirectional transmitter/receiver per example).
- Step 208 Define the parameters of the wireless cells offered by each of the VMSSF (for example the frequency band) in particular with a view to avoiding and minimizing interference with the VMSSF of neighboring sub-zones, for example by allocating disjoint frequency bands to VMSSFs covering neighboring sub-areas, but potentially slightly overlapping each other in order to ensure continuity of wireless coverage in the area.
- the parameters of the wireless cells offered by each of the VMSSF for example the frequency band
- Step 210 Deploy each of the VMSSF at its location thus defined. This step can be carried out according to the method described in the aforementioned patent application of the Applicant in order to maintain the connectivity of the VMSSF with the BA.
- Step 212 Configure the parameters thus defined of the wireless cells of each of the deployed VMSSF and activate the wireless cell of each of them, from so as to activate the coverage of the wireless network in the sub-zone of each VMSSF.
- Step 214 Continuously monitor/monitor (a) the attachment of the EMs to each of the different VMSSF deployed, (b) the location of each of the EMs and (c) notifications of risk of overload of cells without VMSSF thread.
- the attachment of an EM to a VMSSF can be easily detected thanks to the protocol / nominal operation of the wireless technology. wire used for the link between the EM and the VMSSF.
- the VMSSF can then easily send this attachment information to the system in charge of centralizing this information for all of the EMs (and the different VMSSF) and in charge of carrying out this process.
- An example of a procedure for attaching a mobile terminal to an access point of a wireless network is that of WiFi networks.
- the methods described can be implemented at the rear base or at the level of equipment located in the rear network (for example a server).
- each EM Once connected to a VMSSF, each EM which can determine its location at any time during its movement, can report this location information to the system in charge of centralizing this information for all the EMs and in charge of carrying out the present process.
- Each EM can be equipped with a location system allowing it to know its position at any time in the environment in which it operates.
- Any type of location system can be used such as for example (i) satellite location systems (GPS, Galileo, Glonass), (ii) location systems via a radio infrastructure deployed on the ground such as for example an infrastructure UWB (“Ultra Wide Band”) localization systems, (iii) vision localization systems using one or more cameras, in particular via SLAM (“Simultaneous Localization And Mapping”) techniques, or even (iv) hybrid systems mixing several localization techniques such as satellite systems, SLAM, or systems using other types of sensors (inertial units, compasses, accelerometers, odometers, etc.).
- the surveillance/monitoring state 214 of the different parameters (a) of attachment of the EMs, (b) of the location of the EMs, (c) of overload of the wireless cells of the VMSSF, allows when it is detected that this is necessary, to automatically redeploy the wireless network according to the redeployment method of the invention.
- the automatic redeployment of the wireless communication network can be triggered according to different situations which can be detected, and which are described with reference to Figures 3 to 6.
- Figure 3 is a flowchart of the steps which make it possible, from the continuous monitoring 214 of the aforementioned parameters (a), (b), (c), to detect different situations to trigger the automatic redeployment of the wireless network. in the context of the invention.
- a first situation linked to the monitoring of parameter (a) of attachment of EMs consists of determining 302 when an EM is no longer under the coverage of any VMSSF currently deployed in the global coverage area of the network without -thread.
- the method makes it possible to launch an automatic reconfiguration of the wireless network 304.
- Monitoring of the EM location parameter (b) is used to determine the location of the new VMSSF to be deployed near the location where the EM, now disconnected, had left the area covered by the wireless network.
- the network reconfiguration is described in detail with reference to Figure 4.
- a second situation is linked to the monitoring of the EM attachment parameter (a), and consists of determining 306 if a VMSSF is not used, ie if the wireless cell of a VMSSF is not used.
- the method makes it possible to launch an automatic reconfiguration of the wireless network 308.
- the reconfiguration of the network is described in detail with reference to Figure 5.
- a third situation is linked to the monitoring of the parameter (c) of risk of overload of the wireless cells of the VMSSF, and consists of determining 310 if the wireless cell of a VMSSF is at risk of overload. When this situation is identified, the method makes it possible to launch an automatic reconfiguration of the wireless network 312.
- the reconfiguration of the network is described in detail with reference to Figure 6.
- Figure 4 is a flowchart of the steps carried out to trigger the automatic redeployment of the wireless network in the case where it is determined that an EM is no longer under network coverage of any of the VMSSF currently deployed, and is therefore outside the overall area covered by the wireless network provided by all the deployed VMSSF. The process then makes it possible to organize the deployment of a VMSSF in support of the EM identified as no longer under network coverage.
- the EM may be required to leave the sub-zone covered by the VMSSF to which it was initially attached. It can then enter a neighboring sub-zone and attach to the new VMSSF serving this sub-zone, and thus maintain its connectivity.
- the initial VMSSF notifies the central system in charge of carrying out the process of the detachment of the EM (once out of coverage) and the new VMSSF in turn notifies the central system of the attachment of this EM to this new VMSSF , thus confirming to the central system that the EM is still attached to the wireless network.
- the central system can detect that the EM is no longer under coverage and that a redeployment of the wireless network is necessary in order to allow the EM to find cover.
- Step 402 Determine the last known location of the EM currently disconnected from the wireless network.
- Step 404 Define a new geographical sub-zone (outside the global geographical zone currently covered by the wireless network) near the last known location of the EM.
- Step 406 Check that there remain sufficient resources to serve this new sub-zone, that is to say that there remains at least one VMSSF available and not deployed (and if necessary that there remains enough RCRA to cover the distance between the BA and this new sub-zone). If there are not enough resources remaining, then the process is stopped and the network is not redeployed 420.
- Step 408 Define the location of the new VMSSF in charge of this new subzone. Typically this location can be defined as the central point of the sub-zone assuming that the VMSSF is equipped with a wireless base station ensuring omnidirectional coverage. The method then makes it possible to define the parameters of the wireless cell offered by this new VMSSF (the frequency band for example) in particular with a view to avoiding or minimizing interference with the VMSSF of neighboring sub-zones.
- Step 410 Deploy the new VMSSF at the location which has been defined for it (using if necessary the deployment method described in the aforementioned patent application of the Applicant, in order to maintain the connectivity of the VMSSF with over there).
- the method also makes it possible to configure the defined parameters of the wireless cell of the new deployed VMSSF and activate its wireless cell, so as to activate the coverage of the wireless network in the sub-zone of each VMSSF.
- Step 412 Determine whether the EM (which was until now disconnected) is attached to the new VMSSF thus deployed.
- Step 414 If the EM attaches to the new VMSSF, and thus regains its connectivity, the central system is then notified by the new VMSSF that the EM is once again attached to the wireless network, and the central system can also obtain the location information of the EM again. The deployment of the wireless network wire was successfully completed, allowing the EM to regain network coverage.
- Step 416 If the EM does not rejoin (for example after a predefined time), then the central system can proceed to repatriate the VMSSF which had been deployed in the new sub-zone.
- Step 418 The process loops back to step 404 to define a new sub-zone where to redeploy the VMSSF, and attempt to reattach the EM. If after several unsuccessful attempts (configurable parameter), the EM has still not been found or has not been attached, the search process is stopped and the network has ultimately not been redeployed.
- the method described for managing the first situation also advantageously makes it possible to respond to a situation where a given VMSSF becomes faulty or inoperative such that it can no longer offer wireless network coverage (c This is the case during a breakdown, destruction, etc. of the VMSSF).
- the central system determines in fact that the MS which were previously covered by said VMSSF are now not covered, and it can then proceed with the redeployment of the wireless network in this area (thus allowing the faulty VMSSF to be replaced by a new VMSSF).
- the central system always continuously monitors the attachments of the EMs to the different VMSSF deployed as well as the location of each of the EMs, but in addition it also collects additional speed and orientation information in real time. /direction of each MS.
- the central system integrates a trajectory prediction module for each of the EMs, which makes it possible (on a regular basis) to predict the future trajectory of a given EM, taking into account its past trajectory, its speed, its orientation/direction as well as as possibly additional information relating to the terrain (such as for example the presence of a road on which the EM is traveling).
- the central system can then determine (regularly) (1) the instant T where said EM risks leaving the coverage area and (2) the last predicted location L of the EM when it will lose/leave this network coverage (corresponding to the point of intersection between the predicted trajectory for the EM and the perimeter of the network coverage area).
- the central system can then monitor this time indication T, and decide to deploy (in advance) an extension of the network coverage (via the deployment of a VMSSF) in a new sub-zone located near the point L (point exit of the EM from the coverage area) as soon as T is less than a reference value Tref, the latter being able for example to correspond to the time necessary (estimated by the central system) to deploy the extension of the network coverage in the new defined subzone.
- a reference value Tref the latter being able for example to correspond to the time necessary (estimated by the central system) to deploy the extension of the network coverage in the new defined subzone.
- the central system can then send an alert to said EM indicating the risk that it will lose connectivity within a time period T if it continues its trajectory beyond location L, so as to encourage it if possible to revise its trajectory.
- FIG. 5 is a flowchart of the steps carried out to trigger (308) the automatic redeployment of the wireless network in the case where it is determined (306) that a wireless cell of a VMSFF is not used and then organize the repatriation of the VMSFF.
- VMSSF finds itself without any EM attached to it (in the case for example where all the EMs have migrated to other sub-zones).
- the central system can then decide (for example after a certain configurable time) to repatriate the unused VMSSF in order to recover resources (the VMSSF and the possibly associated RCRAs) with a view to future redeployment to new substations. -areas.
- the method in one embodiment carries out steps consisting of:
- Step 502 Deactivate the wireless cell of the VMSSF, and reset the parameters of this wireless cell.
- Step 504 Repatriate the VMSSF by telling it to automatically return to the storage area.
- Figure 6 is a flowchart of the steps carried out to trigger the automatic redeployment of the wireless network in the case where it is determined that a wireless cell of a VMSSF is at risk of overload, and to organize the deployment an additional VMSSF in support.
- a VMSSF can then find itself in a situation where its wireless cell risks being overloaded due to a number of EMs to be served exceeding the capacities of the cell, then requiring the deployment of an additional VMSSF nearby to bring additional resources into the sub-zone. [0113] The central system then proceeds according to the following steps to ensure this redeployment:
- Step 602 After having detected for a VMSSF that it is at risk of overload when a new ME attempts to attach to it while a number of connected MEs is already at the maximum compared to the configuration of the VMSSF to support a maximum number of MEs connected simultaneously, the VMSSF can then refuse the attachment of this new ME (so as not to penalize the quality of the connectivity of the other MEs) and notify the central system of the risk of overload .
- the VMSSF can accept the attachment of this new EM but by only allocating radio resources to it to the extent that this does not disrupt the communications from other MS in the sub-zone (the new MS then has a connection in degraded mode).
- the VMSSF can then notify the central system of the risk of overload and the implementation of this degraded mode for said new EM.
- the central system can then send an alert message to the EM to (a) notify it of its placement in degraded mode and (b) recommend a direction to follow in order to reach a nearby sub-zone likely to offer a better connection (to a VMSSF that has not yet reached its maximum number of connected MEs).
- Step 604 After receiving an overload notification, the method makes it possible to determine the location of the VMSSF (denoted VMSSF 1) which issued the notification.
- Step 606 The method makes it possible to define the position of the new VMSSF (denoted VMSSF 2) which must be deployed near VMSSF 1 in order to increase the network resources offered to the MEs present in the sub-zone of VMSSF 1 and which is currently at risk of overload.
- the location of VMSSF 2 can for example be defined in such a way that it is as close as possible to VMSSF 1 while ensuring that any risk of collision between the two VMSSF is avoided.
- Step 608 The method makes it possible to verify that there remain sufficient resources to deploy the new VMSSF 2 at this new location, that is to say that there remains at least one VMSSF available, not deployed in the zone storage, and where applicable that there remains sufficient RCRA to cover the distance between the BA and this new location. If there are not enough resources remaining, then the process is stopped 610 and the network is not redeployed.
- the VMSSF can then activate degraded mode for said new ME while notifying the central system.
- the central system can then send an alert message to the EM to (a) notify it of its placement in degraded mode and (b) recommend a direction to follow in order to reach a nearby sub-zone likely to offer a better connection (to a VMSSF that has not yet reached its maximum number of connected MEs).
- Step 612 Define the parameters of the wireless cell offered by the new VMSSF 2 (the frequency band for example) in particular with a view to avoiding and minimizing interference with the VMSSF 1 and the VMSSF of the sub- neighboring areas.
- Step 614 Deploy the new VMSSF 2 at its defined location (using RCRAs if necessary in order to maintain the connectivity of the VMSSF 2 with the BA).
- Step 616 Configure the defined parameters of the wireless cell of the new VMSSF 2 deployed and activate its wireless cell, so as to activate the additional coverage of the wireless network offered by the new VMSSF 2 in the sub - area served jointly by the two VMSSF (VMSSF 1, VMSSF 2).
- the EM which is at the origin of the risk of overload is thus able to detect the complementary wireless cell provided by the new VMSSF 2 and to connect to it, so as to have a quality connection to the network wireless.
- the central system in the hypothesis where the new EM causing the risk of overload would have previously been placed in degraded mode with the VMSSF 1, the central system as soon as the new VMSSF 2 is deployed, can notify said new EM of the deployment of the new VMSSF 2 and instruct it to connect to its wireless cell in order to quickly recover a quality connection to the wireless network.
- the general principle of the third situation is that the determination of a risk of overloading a wireless cell is based on exceeding a maximum number of EMs that can be connected simultaneously to the same cell without -thread.
- This approach although simple to implement and reasonably realistic, can nevertheless sometimes result in the emission of an inconsiderate overload alert at the level of the central system (and the non-admission of the new EM, or its putting into mode degraded).
- a variant of realization consists of taking into account in a more detailed manner the network resources actually available at the level of this cell allowing that the new ME can be admitted into the cell without risk of disrupting the quality of communications of the other MEs attached to this same cell.
- the determination of a risk of overloading a wireless cell of a VMSSF is based (1) on the needs in terms of Quality of Service (QoS) of the different MEs and (2) on the all wireless resources available at the cell level (without taking into account a maximum number of EM per cell). If the QoS requirements of a new ME entering a sub-zone can be met by the wireless cell, this new ME can be admitted and attached to the cell, and if this is not the case then it is not allowed (or only allowed in degraded mode with a reduced allocated QoS level and therefore a reduced service) and an overload risk alert is then transmitted to the central unit so that it can proceed with the deployment of a Additional VMSSF in the subzone.
- QoS Quality of Service
- the central system knowing the location and trajectory information of the EMs, can anticipate the upcoming movement of an EM between a first zone covered by a first VMSSF and a second area covered by a second VMSSF. It can therefore determine in advance whether or not this movement presents a risk of overload at the level of the second VMSSF. If the risk of overload is confirmed, then the central system can proceed, always in advance, to the deployment of an additional VMSSF in the future destination zone of the EM and thus make available (in advance) more resources in this zone so as to serve this additional EM as soon as it arrives without any overload. The new EM is then supported by the new VMSSF just deployed.
- the relative priority of the EMs is taken into account.
- different priorities can be allocated to the different EMs, the priority corresponding to the level of criticality of the network connectivity from the point of view of the operational functioning of the EM (i.e. of its ability to carry out its mission).
- the central system can decide to repatriate the VMSSF serving EM2 (while indicating to EM2 its future loss of connectivity and inviting it to move to a nearby sub-zone), in order to recover sufficient resources to cover EM1.
- the central system will evaluate the resources (in particular the number of RCRAs) available with this repatriation in order to ensure that they will be sufficient to redeploy the network at the level of EM1. If this is not the case then the central system will have to identify other potentially usable resources (for example another EM with lower priority and alone under another VMSSF) in order to be able to proceed with the redeployment.
- a variant of the invention makes it possible to take into account the relative priority of the EMs for the management of attachments to the wireless cell of a VMSSF, and for the implementation of the degraded mode for an EM.
- the central system can then take these priorities into account to offer network connectivity as a priority to the high priority EMs over the others.
- a high priority EM enters under the coverage of a wireless cell and the central system detects a risk of overload, it can then give network access to this new high priority EM and reject ( or switch to degraded mode) another EM of this same cell having a lower priority.
- two alternative embodiments of the method of automatic redeployment of the wireless network according to the invention make it possible to ensure the continuity of wireless network connectivity for all mobile equipment even when they move so far from the rear base that the latter no longer has sufficient resources (VMSSF and RCRA) to serve them.
- the method is based on a mobile rear base (and its storage area), and makes it possible to minimize the necessary resources with the disadvantage of introducing a temporary interruption of network connectivity, the time to relocate the rear base.
- the method is based on the joint use of two mobile rear bases (and their storage area). This variant requires more resources but offers the advantage of being able to avoid temporary interruption of network coverage for mobile equipment.
- Figure 7 is a flowchart of the steps 700 carried out by the method of the invention in the embodiment with movement of a single rear base.
- the method makes it possible to determine that there will be a shortage of resources (VMSSF and/or RCRA) to serve the E.M.
- This determination can for example be made on the basis of knowledge (by the central system) of the mission of the EMs, for example when the trajectory of the different EMs is known a priori such as in the case of a convoy of EMs having to move from an initial location to a final location.
- the central system is configured to determine from which point in the EM trajectory (denoted location L1) it will enter a situation of shortage of resources to preserve quality connectivity between the MS and the BA.
- the central system determines that the EMs are approaching this location L1 (or that the convoy will reach it within a time limit T1), it can determine that it will soon run out of resources and then proceed with the redeployment of the wireless network, as shown in the following steps.
- the central system is also configured to also define a zone Z1 near L1, then decide to proceed with the redeployment of the wireless network (according to the following steps) as soon as the EMs have reached this zone Z1.
- the steps for redeployment, while the central system continuously monitors 704 the different parameters (a) of attachment of the EMs to each of the different deployed VMSSFs, (b) of location of each of the EMs and (c) notifications of risk of overloading VMSSF wireless cells, consist of:
- Step 706 Determine when all the EMs have reached the zone Z1 near the location L1 which has been determined.
- Step 708 Alert all EMs that the network is going to be redeployed and that this redeployment will involve a temporary loss of network coverage.
- the central system can indicate the duration of this interruption (duration corresponding to the time to finalize the redeployment of the wireless network).
- Step 710 Proceed to shut down the wireless network, by deactivating the wireless cells of the VMSSF.
- Step 712 Store in memory the information concerning the last location of the VMSSF and the last configuration of each of the wireless cells (for example their frequency band).
- Step 714 Proceed to repatriate all of the VMSSF (and associated RCRAs) to the storage area.
- Step 716 Determine whether a new location closer to the previously determined location L1 exists for the BA (corresponding to a destination making it possible to reduce the average distance between the EMs and the BA significantly).
- Step 718 Proceed with moving the BA (and its storage area) to the new location.
- the movement of the BA can be carried out, for example, automatically, remotely controlled by the central system.
- Step 720 Once the BA has arrived at its new location, the process makes it possible to redeploy the network in the same location and according to the same configuration (kept in memory by the central system) as that which was set up before temporary deactivation of the wireless network.
- the central system thus redeploys the VMSSF to the same locations as previously and resets the configurations of the different radio cells of these VMSSF.
- Figure 8 is a flowchart of the steps carried out by the method of the invention in the embodiment with movement of two rear bases.
- This method is an alternative to that of Figure 7 and offers the advantage of being able to avoid the temporary interruption of network coverage for the EMs while the BA reaches its new location. For this it relies on the joint use of two mobile BAs (BA1 and BA2) each associated with its equally mobile storage area.
- an initial step 802 while the wireless network is already deployed to serve the different EMs, relying on a first BA called BA1, the method makes it possible to determine that there will be a shortage of resources (VMSFF and/or RCRA) to serve MS.
- This determination can for example be made on the basis of knowledge (by the central system) of the mission of the EMs, for example when the trajectory of the different EMs is known a priori such as in the case of a convoy of EMs ahead move from an initial location to a final location.
- the central system is configured to determine from which point in the EM trajectory (denoted location L1) it will enter a situation of shortage of resources to preserve quality connectivity between the MS and the BA.
- the central system determines that the EMs are approaching this location L1 (or that the convoy will reach it within a time limit T1), it can determine that it will soon run out of resources and then proceed with the redeployment of the wireless network, as shown in the following steps.
- the parameter T1 can be chosen in such a way that the delay T1 is slightly greater than the time necessary to deploy the second BA (denoted BA2) at its new location.
- the central system is also configured to also define a zone Z1 near L1, then decide to proceed with the redeployment of the wireless network (according to the following steps) as soon as the EMs have reached this zone Z1 (for example Z1 is chosen such that when the EMs are all in zone Z1 then they are likely to reach point L1 in a time slightly longer than T1).
- the steps for redeployment, while the central system 804 continuously monitors the different parameters (a) of attachment of the EMs to each of the different deployed VMSSFs, (b) of location of each of the EMs and (c) notifications of risk of overloading VMSSF wireless cells, consist of:
- Step 806 Determine when all the EMs have reached the zone Z1 near the location L1 which has been determined.
- Step 808 Determine a new location for the second rear base BA2, sufficiently close to L1, such that the resources (VMSSF and RCRA) of this BA2 are largely sufficient to cover all of the EMs at their current positions respective. For example, assuming that BA1 and BA2 have the same amount of resources, the central system can determine this new location of the BA2 such that it is closer than that of BA1 in relation to the location L1 previously determined (that is to say a destination making it possible to reduce the average distance between the EMs and the BA2 , in comparison with that between the EM and the BA1).
- Step 810 Proceed with moving the second BA2 (and its storage zone) to this new location of BA2.
- the movement of the BA2 can be carried out, for example, automatically, remotely controlled by the central system.
- Step 812 Determine the location of each of the new VMSSFs (associated with BA2) which must be deployed near each of the VMSSFs of BA1 currently serving the EMs.
- the central system can for example define the location of a VMSSF 2 (associated with the BA2) in such a way that the VMSSF 2 is as close as possible to the VMSSF 1 (associated with the BA1) while taking care to avoid any risk of collision between the two VMSSF.
- Step 814 Determine the configurations of the wireless cells of each of the VMSSF of the BA2 in an identical manner to the wireless cells of the corresponding VMSSF of the BA1: thus the VMSSF 2 (associated with the BA2) covering the same sub -zone that VMSSF 1 (associated with BA1) will have the same wireless cell configuration.
- Step 816 Once the BA2 has arrived at its new location, proceed with the deployment of the new wireless network offered by the BA2 (that is to say with the deployment of the corresponding VMSSF) without however yet activating the cells without -wire of this network (i.e. without activating radio coverage).
- Step 818 Once the VMSSF of the new wireless network associated with the BA2 have been set up, proceed jointly with the deactivation of the wireless cells of the first network associated with the BA1 and with the activation of the wireless cells. wire of the second network associated with BA2.
- the central system via the VMSSF of BA2, can issue a network connection request to all the EMs.
- the central system can also collect and store in memory the network context of the wireless cells of the old network (associated with the BA1) before its deactivation and push this network context to the new ones. wireless cells (associated with BA2) so as to allow automatic and transparent attachment of the EMs to the new network, without any particular action by the EMs.
- Step 820 Repatriate all of the VMSSF (and RCRA) from the old network associated with BA1 to the storage area of BA1.
- FIGS 9a to 9i illustrate different examples of implementation of the method of the invention.
- the examples are based on a scenario in which a convoy of 4 vehicles is moving along a road, the vehicles of this convoy having to be interconnected with each other as well as connected to a rear network thanks to a wireless network. dynamically redeployable wire according to the methods of the present invention.
- BA1 and BA2 are available, both connected to the rear network.
- Each of the BAs has 3 VMSSF.
- BA1 also has 12 RCRAs;
- BA2 has a little more RCRA, for example 14 RCRA.
- the convoy starts from its starting point; it is served by BA1 and a wireless network made up of 2 VMSSF (VMSSF1 and VMSSF2) and 4 associated RCRAs, this network having been set up according to the initial deployment process of the wireless network (figure 2).
- the wireless network associated with BA2 is activated at the same time as the network associated with BA1 is deactivated, thus allowing the vehicles in the convoy to maintain network connectivity but now via the new network offered by BA2.
- the invention is implemented via an oriented network management (SDN) architecture for “Software Defined Networking”.
- SDN oriented network management
- This architecture is based on an SDN controller set up at the central system level (at the level of a BA or a server connected to the rear network) and capable of controlling, via its "Southern Interface", the configurations of a set of SDN equipment (the BAs, the RCRAs and the VMSSFs).
- SDN oriented network management
- This architecture is based on an SDN controller set up at the central system level (at the level of a BA or a server connected to the rear network) and capable of controlling, via its "Southern Interface", the configurations of a set of SDN equipment (the BAs, the RCRAs and the VMSSFs).
- the methods described previously with reference to Figures 2 to 8 can be implemented in the form of an SDN Service (at the level of the central system) interfacing with the SDN Controller via its North Interface, way to control the configurations of the different SDN equipment reachable
- This SDN service is thus in charge of 1) managing the initial deployment of the wireless network and 2) detecting that a reconfiguration of the geographic deployment of the wireless network is necessary and then piloting this reconfiguration (via the implementation in place of reconfigurations on the BAs, RCRAs and VMSSFs concerned) thus taking charge in particular of the control of the geographical relocations of the VMSSFs. (and the RCRAs associated with them).
- the different methods of the invention can be implemented (in the form of a computer program/software) at the level of a central system.
- the central system can be located at this rear base or at a server connected to the rear network (the rear base itself being connected to this rear network).
- the central system can also be located at one of these mobile rear bases or at a server connected to the rear network.
- Variant 1 Anticipate the loss of coverage of mobile equipment.
- Variant 2 Taking into account the needs in terms of Quality of Service of mobile equipment in determining a risk of overloading a wireless cell of a mobile vehicle equipped with a wireless base station.
- Variant 3 Taking into account the relative priority of mobile equipment in the redeployment of the wireless network in the event of insufficient resources in the storage area.
- Variant 4 Taking into account the relative priority of mobile equipment for the management of attachments to the wireless cell of a mobile vehicle equipped with a wireless base station, and for the implementation of degraded mode for mobile equipment.
- Variant 5 Anticipation of a risk of overloading a wireless cell of a mobile vehicle equipped with a wireless base station.
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Abstract
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Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2207559A FR3138260B1 (fr) | 2022-07-22 | 2022-07-22 | Procédé et dispositif de redéploiement automatique de la couverture géographique d’un réseau de télécommunication sans fil |
| PCT/EP2023/070278 WO2024018052A1 (fr) | 2022-07-22 | 2023-07-21 | Procédé et dispositif de redéploiement automatique de la couverture géographique d'un réseau de télécommunication sans fil |
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| Publication Number | Publication Date |
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| EP4559278A1 true EP4559278A1 (fr) | 2025-05-28 |
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| EP23741737.3A Withdrawn EP4559278A1 (fr) | 2022-07-22 | 2023-07-21 | Procédé et dispositif de redéploiement automatique de la couverture géographique d'un réseau de télécommunication sans fil |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20250260999A1 (fr) |
| EP (1) | EP4559278A1 (fr) |
| FR (1) | FR3138260B1 (fr) |
| WO (1) | WO2024018052A1 (fr) |
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| KR101779200B1 (ko) * | 2011-12-23 | 2017-09-15 | 한국전자통신연구원 | 무선 통신 시스템에서 이동식 액세스 포인트를 기반으로 한 통신 방법 및 장치 |
| ES2788054T3 (es) * | 2014-03-18 | 2020-10-20 | Ericsson Telefon Ab L M | Provisión de cobertura para una red de comunicación inalámbrica mediante el uso de estaciones de base móviles instaladas en robots o drones |
| EP2938117B1 (fr) * | 2014-04-24 | 2017-12-27 | Alcatel Lucent | Ajustement de la position gépgraphique d'une station de base drone |
| US9363690B1 (en) * | 2015-07-10 | 2016-06-07 | Cisco Technology, Inc. | Closed-loop optimization of a wireless network using an autonomous vehicle |
| US10207590B2 (en) * | 2015-10-15 | 2019-02-19 | T-Mobile Usa, Inc. | Dynamic wireless communications network with a plurality of aerial drones |
| WO2017080600A1 (fr) * | 2015-11-12 | 2017-05-18 | Sony Mobile Communications Inc. | Procédé de positionnement dynamique pour des cellules mobiles |
| US9918234B2 (en) * | 2016-03-07 | 2018-03-13 | At&T Intellectual Property I, L.P. | Supplementing network coverage with a fleet of autonomous drones |
| US9948380B1 (en) * | 2016-03-30 | 2018-04-17 | X Development Llc | Network capacity management |
| FR3117727B1 (fr) | 2020-12-14 | 2025-02-21 | Commissariat Energie Atomique | Procédé et dispositif de déploiement automatique d’un réseau de communication |
| CA3157996A1 (fr) * | 2021-05-10 | 2022-11-10 | Accenture Global Solutions Limited | Systemes et methodes pour des reseaux cellulaires portatifs |
| US11758417B2 (en) * | 2021-10-14 | 2023-09-12 | Dish Wireless L.L.C. | Methods and systems for providing autonomous wireless coverage |
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2022
- 2022-07-22 FR FR2207559A patent/FR3138260B1/fr active Active
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2023
- 2023-07-21 EP EP23741737.3A patent/EP4559278A1/fr not_active Withdrawn
- 2023-07-21 WO PCT/EP2023/070278 patent/WO2024018052A1/fr not_active Ceased
- 2023-07-21 US US18/996,393 patent/US20250260999A1/en not_active Abandoned
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| Publication number | Publication date |
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| FR3138260A1 (fr) | 2024-01-26 |
| US20250260999A1 (en) | 2025-08-14 |
| FR3138260B1 (fr) | 2025-01-10 |
| WO2024018052A1 (fr) | 2024-01-25 |
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