Network hub, transfer method, and onboard network system

A transfer method for a network hub in an onboard network system, the onboard network system including a first network for transmission of first-type frames following a first communication protocol and including a second network for transmission of second-type frames following a second communication protocol that is different from the first communication protocol, the transfer method comprising:

• receiving a first-type frame;
• selecting a transfer destination by a processor, by determining whether or not the first-type frame received in the receiving includes first information that is a base for a second-type frame that is to be transmitted to the second network, and selecting a port for sending a frame based on the first-type frame according to a determination result of the determining;
• and
• transmitting the frame based on the first-type frame to a wired transfer path connected to the port selected in the selecting of the transfer destination,
• wherein the frame is transmitted as the second-type frame to a first wired transmission path connected to the port selected in the selecting of the transfer destination in a first case of determining that the first-type frame received in the receiving includes the first information,
• wherein the frame is transmitted as a second first-type frame to a second wired transmission path connected to the port selected in the selecting of the transfer destination in a second case of determining that the first-type frame received in the receiving does not include the first information, and
• wherein the second-type frame includes the first information in the first-type frame.

An onboard network system including a first network for transmission of first-type frames following a first communication protocol and including a second network for transmission of second-type frames following a second communication protocol that is different from the first communication protocol, the onboard network system comprising:

• an electronic control unit connected to the first network;
• and
• a network hub connected to the first network,
• wherein the electronic control unit:
• generates a first-type frame following the first communication protocol, and
• transmits the generated first-type frame to the first network,
• wherein the electronic control unit generates the first-type frame by including first information as a base for a second-type frame to be transmitted to the second network, and second information indicating that the first-type frame includes information to be transmitted to the second network, in the first-type frame,
• wherein the network hub:
• receives the first-type frame,
• determines whether or not the received first-type frame includes the first information, and selects a port to send a frame based on the received first-type frame, in accordance with a determination result, and
• sends the frame based on the received first-type frame to a wired transmission path connected to the selected port, based on the received first-type frame,
• wherein the network hub sends the frame as the second-type frame to a first wired transmission path connected to the selected port in a first case of determining that the first-type frame received by the receiver includes the first information,
• wherein the network hub sends the frame as a second first-type frame to a second wired transmission path connected to the selected port in a second case of determining that the first-type frame received by the receiver does not include the first information, and
• wherein the second-type frame includes the first information in the first-type frame.