In-vehicle communication system

An in-vehicle communication system, comprising

• a plurality of distribution apparatuses;
• and
• a plurality of onboard apparatuses that are connected to the plurality of distribution apparatuses and receive data distributed from the plurality of distribution apparatuses,
• wherein
• each distribution apparatus comprises:
• a storage section that stores data;
• a distribution section that distributes data to an onboard apparatus;
• a transmission section that transmits data to another distribution apparatus;
• a receiving section that receives data from another distribution apparatus;
• a decision section that performs a decision whether there is data to be distributed on the storage section or not;
• a readout section that reads out data from the storage section on the basis of the decision performed by the decision section;
• and
• a request section that requests a data transmission to another distribution apparatus on the basis of the decision performed by the decision section,
• the readout section reads out the data to be distributed, when the decision section has decided that there is data to be distributed on the storage section,
• the request section requests a data transmission of the data to be distributed to another distribution apparatus storing the data to be distributed, when the decision section has decided that there is not data to be distributed on the storage section, and
• the distribution section distributes data being read out by the readout section and/or data received by the receiving section.

An in-vehicle communication system, comprising:

• a plurality of distribution apparatuses;
• and
• a plurality of onboard apparatuses that are connected to the plurality of distribution apparatuses and receive data distributed from the plurality of distribution apparatuses,
• wherein
• each distribution apparatus comprises:
• a storage section that stores data;
• a distribution section that distributes data to another distribution apparatus or an onboard apparatus;
• a receiving section that receives data from another distribution apparatus;
• a distribution information storage section that stores, in association with each other, data identification information for identifying data, destination information for representing a destination to which the data identified by the data identification information is distributed, and additional information for representing additional data to be added onto the data identified by the data identification information when the data identified by the data identification information is distributed;
• an addition section that adds additional data having been stored by the storage section to the data received by the receiving section, on the basis of storage contents of the distribution information storage section;
• and
• an identification section that identifies a destination to which the data received by the receiving section is distributed, and
• the distribution section distributes the data received by the receiving section with the additional data added by the addition section to the destination identified by the identification section.