Vehicle Certificate Application Method, Vehicle-Mounted Device, and Roadside Unit

A method implemented by a roadside unit (RSU), the method comprising:

• receiving, from a vehicle-mounted device when a universal mobile telecommunications system (UMTS) air (Uu) interface of the vehicle-mounted device is unavailable or a signal quality of the Uu interface is lower than a threshold, a certificate proxy application message comprising certificate application information of a vehicle in which the vehicle-mounted device is mounted;
• sending, to a third-party authority, certificate application information for generating an identity certificate;
• receiving, from the third-party authority, the identity certificate;
• and
• sending, to the vehicle-mounted device, a certificate proxy application response comprising the identity certificate.

A vehicle-mounted device comprising:

• a memory configured to store instructions;
• and
• a processor coupled to the memory and configured to execute the instructions to cause the vehicle-mounted device to:
• determine that a universal mobile telecommunications system (UMTS) air (Uu) interface of the vehicle-mounted device is unavailable or signal quality of the Uu interface is lower than a threshold;
• send, to a roadside unit (RSU) in response to determining that the Uu interface of the vehicle-mounted device is unavailable or the signal quality of the Uu interface is lower than the threshold, a certificate proxy application message comprising certificate application information of a vehicle in which the vehicle-mounted device is mounted;
• and
• receive, from the RSU, a certificate proxy application response comprising an identity certificate of the vehicle based on the certificate application information.

A roadside unit (RSU) comprising:

• a memory configured to store instructions;
• and
• a processor coupled to the memory and configured to execute the instructions to cause the RSU to:
• receive, from a vehicle-mounted device when a universal mobile telecommunications system (UMTS) air (Uu) interface of the vehicle-mounted device is unavailable or signal quality of the Uu interface is lower than a threshold, a certificate proxy application message comprising certificate application information of a vehicle in which the vehicle-mounted device is mounted;
• send, to a third-party authority, a certificate application information for generating an identity certificate;
• receive, from the third-party authority, the identity certificate;
• and
• send, to the vehicle-mounted device, a certificate proxy application response comprising the identity certificate.