Vehicle-mounted millimeter-wave communication device and communication method

1. A vehicle-mounted millimeter-wave communication device mounted on a vehicle and performing communication while temporally changing a communication direction by using an antenna unit capable of changing directivity,

the device comprising:

an acquisition unit configured to acquire a relay request that requests relay of communication from a first communication partner;

a detection unit configured to detect directions of the first communication partner and a second communication partner that are viewed from the vehicle; and

a communication control unit configured to perform control such that, in a case where the relay request is received from the first communication partner and it is possible to communicate with the second communication partner, communication, in which a communication time longer than a communication time set for another direction is set for each of the directions of the first communication partner and the second communication partner, is performed, and communication between the first communication partner and the second communication partner is relayed.

2. The vehicle-mounted millimeter-wave communication device according to claim 1 ,

wherein the first communication partner is a mobile communication device, and

wherein the second communication partner is a roadside communication device.

3. The vehicle-mounted millimeter-wave communication device according to claim 1 , wherein the communication control unit performs control such that, in the case where the relay request is received from the first communication partner and it is possible to communicate with the second communication partner, communication, in which a long communication time is set for each of the directions of the first communication partner and the second communication partner, and communication, in which communication times that are equal to each other are set for all directions, are performed alternately.

4. The vehicle-mounted millimeter-wave communication device according to claim 1 , wherein the detection unit detects a direction of a communication partner, based on a communication direction when communication by millimeter wave communication is established.

5. The vehicle-mounted millimeter-wave communication device according to claim 1 , wherein the detection unit detects a direction of a communication partner, based on position information of the communication partner received through communication.

6. The vehicle-mounted millimeter-wave communication device according to claim 1 , wherein the detection unit detects the directions of the first communication partner and the second communication partner, based on sensor information obtained from a sensor mounted on the vehicle.

7. The vehicle-mounted millimeter-wave communication device according to claim 1 ,

wherein the second communication partner is the roadside communication device, and

wherein the detection unit detects the direction of the roadside communication device, based on pre-stored installation information including an installation position and a communication direction of the roadside communication device.

8. The vehicle-mounted millimeter-wave communication device according to claim 1 , further comprising:

an antenna unit having a plurality of fixed antennas directed in different directions,

wherein the communication control unit changes, when the plurality of fixed antennas are switchably used, a setting of the communication time of each direction by adjusting a selection time period.

9. The vehicle-mounted millimeter-wave communication device according to claim 1 , further comprising:

an antenna unit having a rotary antenna,

wherein the communication control unit changes a setting of the communication time of each direction by adjusting a rotation speed of the rotary antenna.

10. The vehicle-mounted millimeter-wave communication device according to claim 1 , wherein the second communication partner is the roadside communication device,

the vehicle-mounted millimeter-wave communication device further comprising:

a communication volume storage unit configured to store a volume of the relayed communication between the first communication partner and the second communication partner; and

a transmission unit configured to transmit the volume of the relayed communication to a server device that grants a reward in accordance with the volume of the relayed communication.

11. A millimeter wave communication system comprising:

the vehicle-mounted millimeter-wave communication device according to claim 10 ; and

a server device,

wherein the server device includes a reward grant unit configured to grant a reward to a user of the vehicle-mounted millimeter-wave communication device in accordance with a volume of relayed communication received from the vehicle-mounted millimeter-wave communication device.

12. A communication control method in a vehicle-mounted millimeter-wave communication device mounted on a vehicle and performing communication while temporally changing a communication direction by using an antenna unit capable of changing directivity,

the method comprising:

acquiring a relay request that requests relay of communication from a first communication partner;

detecting directions of the first communication partner and a second communication partner that are viewed from the vehicle; and

performing control such that, in a case where the relay request is received from the first communication partner and it is possible to communicate with the second communication partner, communication, in which a communication time longer than a communication time set for another direction is set for each of the directions of the first communication partner and the second communication partner, is performed, and communication between the first communication partner and the second communication partner is relayed.

13. A non-transitory computer-readable medium storing a program for causing a computer to execute the steps of the method according to claim 12 .