Relay apparatus

1. A relay apparatus provided to a vehicle, performing first data communication with a first communication apparatus arranged outside the vehicle, and performing at least second data communication with a plurality of second communication apparatuses provided to the vehicle, the first communication apparatus performing the first data communication, and the plurality of second communication apparatuses performing the first data communication and the second data communication, the relay apparatus comprising:

a permission determination portion determining whether first data communication between the first communication apparatus and a target second communication apparatus is permitted on a basis of predetermined authorization information included in a first communication frame used in a first communication protocol, wherein the permission determination portion receives the first communication frame from the first communication apparatus through a connection switch portion, the connection switch portion is connected with the first communication apparatus and the plurality of second communication apparatuses and determines a connection destination according to a control signal, and the connection destination performs the first data communication with the first communication apparatus; and

an initiation switch portion outputting to the connection switch portion, the control signal designating the target second communication apparatus as the connection destination of the first communication apparatus when the permission determination portion permits the first data communication between the first communication apparatus and the target second communication apparatus,

wherein:

the first data communication is performed according to the first communication protocol;

the second data communication is performed according to a second communication protocol;

the plurality of second communication apparatuses include the target second communication apparatus;

the plurality of second communication apparatuses perform the second data communication using a common communication channel in common with the plurality of second communication apparatuses; and

a total amount of the first data communication per unit time is greater than a total amount of the second data communication per unit time.

2. The relay apparatus according to claim 1 , further comprising:

a termination detection portion detecting a termination of the first data communication, which is permitted by the permission determination portion; and

a termination switch portion outputting to the connection switch portion, the control signal designating the relay apparatus as the connection destination of the first communication apparatus when the termination detection portion detects the termination of the first data communication.

3. The relay apparatus according to claim 2 , wherein:

the termination detection portion detects the termination of the first data communication on a basis of a termination signal that the target second communication apparatus transmits by using the second data communication.

4. The relay apparatus according to claim 3 , wherein:

when the first data communication between the target second communication apparatus and the first communication apparatus is terminated, the termination detection portion receives the termination signal from the target second communication apparatus.

5. The relay apparatus according to claim 3 , wherein:

the termination detection portion receives the termination signal from the target second communication apparatus when the target second communication apparatus determines whether the target second communication apparatus permits the first data communication with the first communication apparatus on a basis of the authorization information, and when the target second communication apparatus does not permit the first data communication with the first communication apparatus; and

the first communication frame transmitted from the first communication apparatus includes the authorization information.

6. The relay apparatus according to claim 1 , wherein:

the first communication frame transmitted from the first communication apparatus includes, as the authorization information, function information that shows a function of the target second communication apparatus.

7. The relay apparatus according to claim 1 , further comprising:

a wakeup portion waking up according to a wakeup signal that is transmitted from the first communication apparatus; and

a target wakeup portion, by the second data communication, waking up the target second communication apparatus that is in a sleep status, when the relay apparatus wakes up.

8. The relay apparatus according to claim 1 , wherein:

the first data communication includes Ethernet communication.

9. A relay system comprising:

a relay apparatus provided to a vehicle, performing first data communication with a first communication apparatus arranged outside the vehicle, and performing at least second data communication with a plurality of second communication apparatuses provided to the vehicle, the first communication apparatus performing the first data communication, and the plurality of second communication apparatuses performing the first data communication and the second data communication; and

a connection switch portion that is connected with the first communication apparatus and the plurality of second communication apparatuses and determines a connection destination according to a control signal, wherein the connection destination performs the first data communication with the first communication apparatus,

wherein:

the relay apparatus includes:

a permission determination portion determining whether first data communication between the first communication apparatus and a target second communication apparatus is permitted on a basis of predetermined authorization information included in a first communication frame used in a first communication protocol, the permission determination portion receiving, through the connection switch portion, the first communication frame from the first communication apparatus, and

an initiation switch portion outputting to the connection switch portion, the control signal designating the target second communication apparatus as the connection destination of the first communication apparatus when the permission determination portion permits the first data communication between the first communication apparatus and the target second communication apparatus;

the first data communication is performed according to the first communication protocol;

the second data communication is performed according to a second communication protocol;

the plurality of second communication apparatuses include the target second communication apparatus;

the plurality of second communication apparatuses perform the second data communication using a common communication channel in common with the plurality of second communication apparatuses; and

a total amount of the first data communication per unit time is greater than a total amount of the second data communication per unit time.

10. The relay apparatus according to claim 9 , further comprising:

a termination detection portion detecting a termination of the first data communication, which is permitted by the permission determination portion.

11. The relay apparatus according to claim 10 , further comprising:

a termination switch portion outputting to the connection switch portion, the control signal designating the relay apparatus as the connection destination of the first communication apparatus when the termination detection portion detects the termination of the first data communication.