Geofence-based V2X certificate downloading method and system

Abstract

The invention provides a V2X certificate downloading method and system for a vehicle, and the method comprises the steps: determining the current position of the vehicle in response to a V2X certificate downloading request; detecting, based on the determined location, whether the vehicle is outside a geo-fence or will be driven away from the geo-fence for a predetermined period of time, the geo-fence indicating a signaled area; and determining whether to start downloading the V2X certificate or to delay downloading the V2X certificate based on a result of the detection. In addition, the invention also provides a vehicle supporting the V2X certificate downloading function based on the geo-fence.

Description

Technical Field

[0001] The present invention relates to the field of Internet of Vehicles, and more specifically, to a V2X certificate downloading method and system based on geo-fencing. Background Art

[0002] At present, with the rapid development of autonomous driving, V2X communication will play an increasingly important role. Autonomous vehicles can realize various autonomous driving functions based on V2X information. Therefore, the security requirements of V2X communication are obvious. Attackers using fake messages may cause vehicles to misjudge, thus affecting the vehicle's autonomous driving function, which will pose a serious threat to the safety of the vehicle.

[0003] At present, in order to ensure the security of V2X communication, it is necessary to confirm that the message comes from a legitimate sending device and that the message has not been modified during transmission. Currently, digital certificates provided by a security system based on a public key infrastructure (PKI) and digital signature technology are used to prevent illegal vehicles from sending false messages. The authenticity of the message can be protected based on digital certificate technology, and the use of digital certificates and digital signature technology based on an asymmetric encryption system can counter attacks such as forgery, tampering, and replay of messages transmitted on direct ports.

[0004] However, currently when downloading a digital certificate (for example, when downloading a Pseudonymous Certificate (PC) from a Pseudonymous Certificate Authority (PCA)), the certificate download may fail due to a download time limit (for example, in an area with poor signal), which means that even if the vehicle fails to download the certificate, the certificate may not be downloaded again if the download limit has been reached.

[0005] Therefore, in order to improve the success rate of V2X certificate downloading and further improve the security of V2X communication, it is expected to provide a V2X certificate downloading solution based on geo-fencing. Summary of the invention

[0006] This Summary is provided to introduce some concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

[0007] According to a first aspect of the present invention, there is provided a V2X certificate downloading method for a vehicle, the method comprising: determining a current location of the vehicle in response to a download request for a V2X certificate; detecting whether the vehicle is outside a geofence or will leave the geofence within a predetermined time period based on the determined location, the geofence indicating an area with good signals; and determining whether to start downloading the V2X certificate or postpone downloading the V2X certificate based on a result of the detection.

[0008] Therefore, the present invention determines whether to pause or start / continue downloading based on detecting whether the vehicle is about to leave a geographic fence area with good signals, thereby improving the download success rate and further improving the security of V2X message communication.

[0009] According to one embodiment of the present invention, determining whether to start downloading the V2X certificate or to postpone downloading the V2X certificate based on the result of the detection further includes: starting downloading the V2X certificate when the result of the detection indicates that the vehicle will remain within the geofence within the predetermined time period; and postponing downloading the V2X certificate when the result of the detection indicates that the vehicle is outside the geofence or will leave the geofence within the predetermined time period, until downloading the V2X certificate is started when it is detected that the vehicle is within the geofence.

[0010] According to a further embodiment of the present invention, the geo-fence includes open areas and excludes the following areas: tunnels, underground parking lots, high-rise buildings or urban canyons.

[0011] According to a further embodiment of the present invention, the predetermined time period is preset based on an expected download time of the V2X certificate.

[0012] According to a further embodiment of the present invention, the detection of whether the vehicle will leave the geo-fence within the predetermined time period is based on the current vehicle speed and the distance to the geo-fence boundary to be reached.

[0013] According to a further embodiment of the present invention, the method further includes: after starting to download the V2X certificate, if it is detected that the vehicle leaves the geofence, postponing the downloading until it is detected that the vehicle is within the geofence again and then continuing to download the V2X certificate.

[0014] According to a further embodiment of the present invention, the method further includes: when determining to postpone downloading the V2X certificate, estimating a postponement time based on a current vehicle speed and a distance from a geofence boundary to be departed; and detecting again whether the vehicle is within the geofence after the postponement time.

[0015] According to a second aspect of the present invention, a V2X certificate downloading system for a vehicle is provided, the system comprising: a vehicle positioning device for determining the current location of the vehicle in response to a download request for a V2X certificate; a geo-fence detection device for detecting, based on the determined location, whether the vehicle is outside the geo-fence or will leave the geo-fence within a predetermined time period, the geo-fence indicating an area with good signals; and a certificate downloading device for determining, based on a result of the detection, whether to start downloading the V2X certificate or to postpone downloading the V2X certificate.

[0016] According to one embodiment of the present invention, the certificate downloading device is further configured to: start downloading the V2X certificate when the result of the detection indicates that the vehicle will remain within the geofence within the predetermined time period; and postpone downloading the V2X certificate when the result of the detection indicates that the vehicle is outside the geofence or will leave the geofence within the predetermined time period, until the vehicle is detected to be within the geofence.

[0017] According to a further embodiment of the present invention, the predetermined time period is preset based on an expected download time of the V2X certificate.

[0018] According to a further embodiment of the present invention, the detection of whether the vehicle will leave the geo-fence within the predetermined time period is based on the current vehicle speed and the distance to the geo-fence boundary to be reached.

[0019] According to a further embodiment of the present invention, the certificate downloading device is further configured to: after starting to download the V2X certificate, if it is detected that the vehicle leaves the geofence, postpone the downloading until it is detected that the vehicle is within the geofence again, and then continue to download the V2X certificate.

[0020] According to a further embodiment of the present invention, the certificate downloading device is further configured to estimate the postponement time based on the current vehicle speed and the distance to the geofence boundary to be departed when determining to postpone the downloading of the V2X certificate; and the geofence detection device is further configured to detect again whether the vehicle is within the geofence after the postponement time.

[0021] According to a third aspect of the present invention, a vehicle supporting V2X certificate download is provided, the vehicle comprising: a positioning system, the positioning system being configured to provide positioning data about the current location of the vehicle; an on-board unit, the on-board unit being configured to download the V2X certificate from a back end; and a V2X certificate download system as described in any one of the preceding aspects.

[0022] According to a fourth aspect of the present invention, there is provided a computer-readable storage medium storing instructions, which, when executed, causes a machine to perform a method as described in any one of the above aspects.

[0023] These and other features and advantages will become apparent by reading the following detailed description and by reference to the associated drawings.It is to be understood that the foregoing general description and the following detailed description are illustrative only and are not restrictive of the aspects of what is claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to understand the manner in which the above features of the present invention are used in detail, the above briefly summarized contents can be described in more detail with reference to various embodiments, some of which are shown in the accompanying drawings. However, it should be noted that the accompanying drawings only show some typical aspects of the present invention and should not be considered to limit its scope, because the description may allow for other equally effective aspects.

[0025] Figure 1 An example of V2X certificate downloading in the prior art is shown.

[0026] Figure 2 A schematic diagram of the architecture of a V2X certificate download system based on geo-fence according to an embodiment of the present invention is shown.

[0027] Figure 3 A schematic diagram of a V2X certificate download scenario based on geo-fence according to an embodiment of the present invention is shown.

[0028] Figure 4 A schematic flow chart of a V2X certificate downloading method based on geo-fence according to an embodiment of the present invention is shown.

[0029] Figure 5 An exemplary vehicle supporting geo-fence based V2X certificate download according to one embodiment of the present invention is shown.

[0030] Figure 6 A schematic diagram of the architecture of a V2X certificate download system based on geo-fence according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0031] The present invention is described in detail below in conjunction with the accompanying drawings, and the features of the present invention will be further apparent in the following specific description. The term "vehicle" used throughout the specification refers to any type of automobile, including but not limited to cars, vans, trucks, buses, etc. For simplicity, the present invention is described with respect to "automobile". The term "A or B" used in the specification means "A and B" and "A or B", and does not mean that A and B are exclusive, unless otherwise specified.

[0032] Figure 1 An example of V2X certificate downloading in the prior art is shown 100. In V2X communications (e.g., V2V, V2P, and V2I communications), it is necessary to take measures to ensure the integrity and authenticity of broadcast messages, authenticate the source of messages, ensure the legitimacy of messages, and ensure that message transmissions can resist attacks such as forgery, tampering, and replay.

[0033] like Figure 1 As shown in the figure, the digital signature technology that ensures the communication security between the terminals of the Internet of Vehicles is implemented by the digital certificate distributed to the vehicle by the security authentication platform of the PKI CA mechanism. The vehicle with V2X function submits the registration application to the V2X security authentication platform by providing the initial trust credentials. After the registration application is verified, the V2X security authentication platform issues a registration certificate (EC) to the vehicle as the identification of the vehicle's V2X communication, in which the certification authority (AAA) can accept the request of the vehicle terminal and perform the corresponding authentication and signing. The vehicle periodically submits EC to the V2X security authentication platform to apply for a pseudonym certificate (PC) for signing the V2X message. The application is confirmed by the registration authority (RA) and the certificate is issued by the pseudonym certificate authority (PCA), in which the registration certificate authority (ECA) issues the EC certificate and the PCA issues the PC certificate. The institutional certificates of ECA and PCA are issued by a unified superior CA (intermediate CA (ICA), in which ICA mainly realizes the connection with the root CA upward).

[0034] In addition, the trust between different V2X CAs can be achieved by using a commonly trusted root CA or a distributed V2X CA authentication method using a certificate trust list (CTL).

[0035] However, in the case of downloading these V2X certificates (e.g., pseudonym certificates, certificate trust lists), if the vehicle is currently in an area with poor signal (e.g., a tunnel, underground parking garage, etc.), a download failure is likely to occur, which may result in the inability to download the V2X certificate when the download time is limited due to security, thereby causing subsequent V2X communication problems.

[0036] Therefore, in order to solve the above problems, Figure 2 FIG. 4 shows a schematic diagram of the architecture of a V2X certificate downloading system 200 based on geo-fence according to an embodiment of the present invention.

[0037] Geofencing refers to the use of the Global Positioning System (GPS) satellite network and / or local radio frequency identifiers (e.g., Wi-Fi nodes) to create a virtual boundary around a location, which can then be paired with a hardware / software application that responds to the boundary in some way as indicated by program parameters. In this application, in order to avoid the problem of download failure in areas with poor signals, it is considered to create a geofence based on areas with good signals, where the download operation of the V2X certificate is performed only within the geofence.

[0038] like Figure 2 As shown, the V2X certificate downloading system 200 may include at least a vehicle positioning device 202 , a geo-fence detection device 204 , and a certificate downloading device 206 .

[0039] The vehicle positioning device 202 can determine the current location of the vehicle in response to the download request of the V2X certificate.

[0040] In one embodiment, the download request for the V2X certificate may be initiated by the vehicle to the PKI backend periodically, or may be actively pushed by the PKI backend periodically or based on the busyness of the server.

[0041] The geo-fence detection device 204 can detect whether the vehicle is outside the geo-fence or will leave the geo-fence within a predetermined time period based on the determined location, and the geo-fence indicates a good signal area.

[0042] In one embodiment, a geofence (e.g., an unobstructed elevated road, a city expressway, or other area with good signal) can be created based on map information obtained through the Internet, and a determination can be made as to whether the current location of the vehicle is within the virtual boundary of the geofence, thereby detecting whether the vehicle is currently within the geofence.

[0043] In one embodiment, the geo-fence may be open area and does not include areas such as tunnels, underground parking lots, high-rise buildings, or urban canyons.

[0044] In one embodiment, the detection of whether the vehicle will leave the geofence within the predetermined time period may be based on the current vehicle speed and the distance to the geofence boundary to be reached. For example, if the product of the current vehicle speed and the predetermined time period is greater than the distance to the geofence boundary to be reached, the vehicle is likely to leave the geofence within the predetermined time period, and the subsequent download operation may be considered to be postponed.

[0045] In one embodiment, the predetermined time period may be preset based on the expected download time of the requested V2X certificate, thereby avoiding the problem of download interruption caused by downloading already started when the vehicle is about to leave an area with good signals.

[0046] The certificate downloading device 206 may determine whether to start downloading the V2X certificate or postpone downloading the V2X certificate based on the detection result.

[0047] In one embodiment, the certificate downloading device 206 may start downloading the V2X certificate when the detection result indicates that the vehicle will remain within the geofence within a predetermined time period, and may postpone downloading the V2X certificate when the detection result indicates that the vehicle is outside the geofence or will leave the geofence within a predetermined time period until the vehicle is detected within the geofence.

[0048] In another embodiment, after the download of the V2X certificate has begun, if it is detected that the vehicle leaves the geofence, the download is postponed until the vehicle is detected to be within the geofence again, and then the download of the V2X certificate is continued.

[0049] In one embodiment, when determining to postpone downloading the V2X certificate, the certificate downloading device 206 may estimate the postponement time based on the current vehicle speed and the distance to the geofence boundary to be driven away, and the geofence detection device 204 may detect again whether the vehicle is in the geofence after the postponement time. In this way, it is possible to estimate when the vehicle is in the geofence again by estimating the postponement time, so as to know when the detection operation can be performed again.

[0050] Therefore, by combining geo-fencing technology to determine when to download the V2X certificate, the download success rate can be significantly improved, thereby further improving the security of V2X message communications.

[0051] Those skilled in the art will appreciate that the V2X certificate downloading system of the present invention may be implemented in hardware or software, and the modules may be merged or combined in any appropriate manner.

[0052] Figure 3 A schematic diagram of a V2X certificate downloading scenario 300 based on geo-fence according to an embodiment of the present invention is shown.

[0053] like Figure 3 As shown, area 1 is an urban canyon area with a length of about 3 km, area 2 is a tunnel area with a length of about 10 km, and area 3 is a high-rise building area with a length of about 3 km. In these areas, the signal may be poor, and the download of the V2X certificate may fail when the vehicle is traveling in these areas (for example, due to the download limit being reached).

[0054] For example, the vehicle periodically (e.g., regularly at 4 a.m. every day) requests a V2X certificate (e.g., a pseudonym certificate) from the PKI backend, and in response to the above request (e.g., when the regular download time is reached), the current location of the vehicle is first determined.

[0055] It can then be detected based on the determined location that the vehicle is about to enter area 1 (i.e., the urban canyon area), which means that the vehicle is about to leave the geofence (which indicates an area with good signals) within a predetermined time period, and the above-mentioned predetermined time period can be preset based on the expected download time of the V2X certificate.

[0056] The download of the V2X certificate can then be paused / postponed based on the result of the above detection (i.e., the vehicle is about to leave the area with good signal), and the download will not start until the vehicle is detected to be within the geofence again.

[0057] In addition, the vehicle can also estimate the delay time based on the current vehicle speed and the distance to the boundary of the geofence to be left, and re-detect whether the vehicle is in the geofence after the delay time. For example, if the length of area 1 is 3km and the current vehicle speed is 60km / h, the estimated delay time is about 3min. Then, it can re-detect whether the vehicle is in the geofence after 3min, and send a download request to the PKI backend to start downloading the V2X certificate when it is determined that the vehicle is in the geofence, or start downloading the V2X certificate in response to a push request from the PKI backend. Figure 3 In the example of , after the vehicle is detected leaving area 1 (i.e., after entering the geo-fence), the V2X certificate can be downloaded in response to a push request from the PKI backend.

[0058] Similarly, when it is detected that the vehicle is about to enter area 2 (i.e., the tunnel area), the download of the V2X certificate can be postponed until the vehicle leaves area 2. In addition, the delay time can be estimated based on the current vehicle speed and the distance to the boundary of the geofence to be left, and the vehicle is detected again after the delay time to see if it is in the geofence. For example, if the length of area 2 is 10 km and the current vehicle speed is 60 km / h, the delay time is estimated to be about 10 minutes. Then, it can be detected again after 10 minutes whether the vehicle is in the geofence, and the download of the V2X certificate can be started or continued when it is determined that the vehicle is in the geofence.

[0059] Similarly, when it is detected that the vehicle is about to enter area 3 (i.e., the high-rise building area), the downloading of the V2X certificate can be postponed until the vehicle leaves area 3.

[0060] Of course, there are any other scenarios for downloading V2X certificates in conjunction with geo-fencing.

[0061] Figure 4 A schematic flow chart of a V2X certificate downloading method 400 based on geo-fence according to an embodiment of the present invention is shown.

[0062] The method 400 begins at step 402 , where the vehicle positioning device 202 may determine the current location of the vehicle in response to a request to download a V2X certificate.

[0063] In one embodiment, in the case where the vehicle periodically (regularly at download time) requests the V2X certificate from the PKI backend, the vehicle positioning device 202 may determine the current location of the vehicle before downloading the V2X certificate at the download time.

[0064] In step 404 , the geo-fence detection device 204 may detect whether the vehicle is outside the geo-fence or will leave the geo-fence within a predetermined time period based on the determined location, the geo-fence indicating a good signal area (ie, a good network connection area).

[0065] In one embodiment, the geo-fence may include open areas and exclude the following areas: tunnels, underground parking lots, high-rise buildings, or urban canyons.

[0066] In one embodiment, the geofence detection device 204 may start downloading the V2X certificate when the detection result indicates that the vehicle will remain within the geofence within a predetermined time period, and postpone downloading the V2X certificate when the detection result indicates that the vehicle is outside the geofence or will leave the geofence within a predetermined time period until the vehicle is detected within the geofence.

[0067] In one embodiment, the predetermined time period may be preset based on an expected download time of the V2X certificate.

[0068] In one embodiment, the detection of whether the vehicle will leave the geo-fence within a predetermined time period may be based on the current vehicle speed and the distance to the geo-fence boundary that will be reached.

[0069] In step 406 , the certificate downloading device 206 may determine whether to start downloading the V2X certificate or postpone downloading the V2X certificate based on the result of the detection.

[0070] In one embodiment, after starting to download the V2X certificate, if it is detected that the vehicle leaves the geofence, the download can be postponed until the vehicle is detected to be within the geofence again, and then the download of the V2X certificate is continued.

[0071] In one embodiment, when it is determined to postpone downloading the V2X certificate, the postponement time may be estimated based on the current vehicle speed and the distance to the geofence boundary to be left, and whether the vehicle is within the geofence may be detected again after the postponement time.

[0072] Therefore, by combining geo-fencing to determine whether the vehicle is in an area with good signal (good network connection) and downloading only when the vehicle is in an area with good signal, the download success rate can be significantly improved, thereby further improving the security of V2X communications.

[0073] Figure 5 An exemplary vehicle 500 supporting geo-fence based V2X certificate download according to one embodiment of the present invention is shown.

[0074] The vehicle 500 may include a positioning system 502, which may be configured to provide positioning data regarding the current location of the vehicle 500. In one embodiment, the positioning system 502 may be implemented as an onboard GPS.

[0075] Additionally, the vehicle 500 may further include an on-board unit (OBU), which may be configured to be in communication with a backend PKI and download the V2X certificate from the backend PKI (eg, downloading the PC from the PCA).

[0076] In addition, the vehicle 500 may also include the above-mentioned V2X certificate download system 200, which can support various functions described in this document, including: determining the current location of the vehicle in response to a request to download the V2X certificate; detecting whether the vehicle is outside a geofence or will leave the geofence within a predetermined time period based on the determined location, and the geofence indicates an area with good signals; and determining whether to start downloading the V2X certificate or postpone downloading the V2X certificate based on the detection result.

[0077] Figure 6 A schematic diagram of the architecture of a geo-fence-based V2X certificate downloading system 600 according to an embodiment of the present invention is shown.

[0078] like Figure 6 As shown in , the system 600 may include a memory 602 and at least one processor 604. The memory 602 may include RAM, ROM, or a combination thereof. The memory 602 may store computer executable instructions, which, when executed by at least one processor 604, cause the at least one processor 604 to perform various functions described herein, including: determining the current location of the vehicle in response to a download request for a V2X certificate; detecting whether the vehicle is outside a geofence or will leave the geofence within a predetermined time period based on the determined location, the geofence indicating a good signal area; and determining whether to start downloading the V2X certificate or postpone downloading the V2X certificate based on the result of the detection.

[0079] In some cases, memory 602 may include, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices. Processor 604 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, discrete gate or transistor logic components, discrete hardware components, or any combination thereof).

[0080] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted by a computer-readable medium as one or more instructions or codes. Other examples and implementations fall within the scope of the present disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination thereof. Features that implement the functions may also be physically located in various locations, including being distributed so that parts of the functions are implemented at different physical locations.

[0081] What has been described above includes examples of various aspects of the claimed subject matter. Of course, it is not possible to describe every conceivable combination of components or methods for the purpose of describing the claimed subject matter, but one of ordinary skill in the art will recognize that many further combinations and permutations of the claimed subject matter are possible. Thus, the disclosed subject matter is intended to encompass all such alterations, modifications, and variations that fall within the spirit and scope of the appended claims.

Claims

1. A method for downloading a V2X certificate for a vehicle, the method comprising: In response to the download request of the V2X certificate, determining the current location of the vehicle; detecting whether the vehicle is outside a geofence or will leave the geofence within a predetermined time period based on the determined location, the geofence indicating a good signal area; as well as Based on the result of the detection, it is determined whether to start downloading the V2X certificate or to postpone downloading the V2X certificate.

2. The method according to claim 1, characterized in that Determining whether to start downloading the V2X certificate or postpone downloading the V2X certificate based on the result of the detection further includes: In case the result of the detection indicates that the vehicle will remain within the geofence within the predetermined time period, starting to download the V2X certificate; and When the result of the detection indicates that the vehicle is outside the geofence or will leave the geofence within the predetermined time period, downloading of the V2X certificate is postponed until the vehicle is detected to be within the geofence.

3. The method according to claim 1, characterized in that The geo-fence includes open areas and excludes the following areas: tunnels, underground parking lots, high-rise buildings, or urban canyons.

4. The method according to claim 1, characterized in that The predetermined time period is preset based on an expected download time of the V2X certificate.

5. The method according to claim 1, characterized in that The detection of whether the vehicle will leave the geo-fence within the predetermined time period is based on the current vehicle speed and the distance to the geo-fence boundary to be reached.

6. The method according to claim 1, characterized in that The method further comprises: After starting to download the V2X certificate, if it is detected that the vehicle leaves the geofence, the download is postponed until it is detected that the vehicle is within the geofence again, and then the download of the V2X certificate is continued.

7. The method according to claim 1, characterized in that The method further comprises: When determining to postpone downloading the V2X certificate, estimating a postponement time based on a current vehicle speed and a distance to a geo-fence boundary that is about to be departed; and After the delay time, it is detected again whether the vehicle is within the geo-fence.

8. A V2X certificate downloading system for a vehicle, the system comprising: A vehicle positioning device, configured to determine a current location of the vehicle in response to a download request of a V2X certificate; a geo-fence detection device for detecting whether the vehicle is outside a geo-fence or will leave the geo-fence within a predetermined time period based on the determined position, the geo-fence indicating a good signal area; as well as The certificate downloading device is used to determine whether to start downloading the V2X certificate or postpone downloading the V2X certificate based on the result of the detection.

9. The system according to claim 8, characterized in that The certificate downloading device is further configured to: In a case where the result of the detection indicates that the vehicle will remain within the geofence within the predetermined time period, starting to download the V2X certificate; and When the result of the detection indicates that the vehicle is outside the geofence or will leave the geofence within the predetermined time period, downloading of the V2X certificate is postponed until the vehicle is detected to be within the geofence.

10. The system according to claim 8, characterized in that The predetermined time period is preset based on an expected download time of the V2X certificate.

11. The system according to claim 8, characterized in that The detection of whether the vehicle will leave the geo-fence within the predetermined time period is based on the current vehicle speed and the distance to the geo-fence boundary to be reached.

12. The system of claim 8, wherein: The certificate downloading device is further configured to: After starting to download the V2X certificate, if it is detected that the vehicle leaves the geofence, the download is postponed until it is detected that the vehicle is within the geofence again, and then the download of the V2X certificate is continued.

13. The system of claim 8, wherein: The certificate downloading device is further configured to estimate a deferral time based on a current vehicle speed and a distance to a geo-fence boundary to be departed when determining to defer downloading of the V2X certificate; and The geofence detection device is further configured to detect again whether the vehicle is within the geofence after the delay time.

14. A vehicle supporting V2X certificate downloading, the vehicle comprising: a positioning system configured to provide positioning data regarding a current location of the vehicle; An on-board unit, the on-board unit being configured to download a V2X certificate from a backend; as well as A V2X certificate downloading system as claimed in any one of claims 8 to 13.

15. A computer-readable storage medium storing instructions, which, when executed, cause a vehicle to perform the method according to any one of claims 1 to 7.

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