Multiple communication protocol coexistence

An over the air (OTA) operation method, the method comprising:

• receiving an OTA request from an original equipment manager (OEM);
• and
• sending a controller area network (CAN) message based on the received OTA request across a CAN bus to one or more systems of a vehicle,
• wherein while a vehicle ignition is on, only classic CAN messages are used to operate the one or more systems of the vehicle, and wherein the CAN message is a classic CAN message for operating a transmission control unit (TCU) connected to the CAN bus;
• wherein while the vehicle ignition is off, only CAN flexible-data (FD) messages are used to reprogram the one or more systems of the vehicle, and wherein the CAN message is a CAN FD message for reprogramming the TCU connected to the CAN bus;
• and
• reprogramming the TCU by using the CAN FD message.

An over the air (OTA) reprogramming system of a vehicle, the OTA reprogramming system comprising:

• an OTA manager configured to:
• receive an OTA request from an original equipment manufacturer (OEM);
• send a controller area network (CAN) message based on the received OTA request across a CAN bus to one or more systems of the vehicle,
• wherein while a vehicle ignition is on, only classic CAN messages are used to operate the one or more systems of the vehicle, and the CAN message is a classic CAN message;
• wherein while the vehicle ignition is off, only CAN flexible-data (FD) messages are used to reprogram the one or more systems of the vehicle, and wherein the CAN message is a CAN FD message;
• and
• a transmission control unit (TCU) on the CAN bus configured to receive the CAN message and (i) use the classic CAN message to operate the TCU while the vehicle ignition is on, and (ii) use the CAN FD message to reprogram the TCU while the vehicle ignition is off;
• and
• wherein the OTA manager is further configured to reprogram the TCU by using the CAN FD message.