Abstract: A gateway that is mounted on a vehicle, includes: a communication unit that can communicate with an external device through other gateway capable of communicating with the external device outside the vehicle, wherein said other gateway includes a switch unit that executes relay processing of relaying communication data and a processing unit that controls the relay processing of the switch unit, wherein said communication unit can relay communication data received from said switch unit to a device inside said vehicle, said gateway further including: a control unit that determines abnormality in said other gateway and if it is determined that said abnormality occurs, controls relay processing of said other gateway.

Abstract: A switch device for relaying flow data in an in-vehicle network, being equipped with an acquiring section for acquiring correspondence information indicating at least a correspondence relationship among a transmission destination IP address, a transmission source IP address, transmission destination port information, transmission source port information and a transmission destination MAC address and a relay section for acquiring the transmission destination MAC address from the correspondence information on the basis of the transmission destination IP address, the transmission source IP address, the transmission destination port information and the transmission source port information included in a frame that is received by the switch device and constitutes the flow data and for performing transmission processing to transmit the frame including the acquired transmission destination MAC address.

Abstract: An in-vehicle communication system is an in-vehicle communication system to be mounted on a vehicle, and includes: a gateway performing relay processing involving communication protocol conversion; and one or a plurality of switching devices performing relay processing not involving the communication protocol conversion, the gateway or the switching device manages data update of a target device mounted on the vehicle, the gateway receives update data for the target device from an external device disposed outside the vehicle, transmits, to the switching device connected thereunder, the update data for the target device, which is connected to the switching device, not holding the update data at least after completing the update, and holds the update data for the target device, which is connected thereto, also after completing the update not through the switching device.

Abstract: A switch device being equipped with an acquisition section for acquiring environmental information indicating the surrounding environment of a vehicle provided with a plurality of function sections; a switching section for performing relay processing for relaying communication data from at least one of the function sections to at least one of the other function sections; and a setting section for setting the priority level of the communication data in the relay processing on the basis of the environmental information acquired by the acquisition section.

Abstract: An on-vehicle communication system mounted on a vehicle comprises a first switching device, a second switching device and a third switching device each including a first communication port and a second communication port. The first communication port and the second communication port of the first switching device are respectively connected to the first communication port of the second switching device and the first communication port of the third switching device, and the second communication port of the second switching device and the second communication port of the third switching device are connected to each other. Each of the first switching device, the second switching device and the third switching device measures a reception signal quality for the first communication port of the device itself and a reception signal quality for the second communication port of the device itself.

Abstract: A switching device is a switching device mounted on a vehicle and includes a plurality of communication ports connectable to cables for Ethernet communication, a circuit operated by using power supplied via each of the communication ports, an acquisition unit that acquires a measurement result for noise of the power supplied via each of the communication ports, and a determination unit that performs determination processing for determining whether or not power to be supplied via a corresponding one of the communication ports is to be output to the circuit based on the measurement result for noise acquired by the acquisition unit.

Abstract: Downlink is achieved by point-to-multipoint communication. There is provided a radio communication system 1 that provides information to a mobile terminal 3 via a radio communication device 2 that performs radio communication with the mobile terminal 3. The mobile terminal 3 is capable of receiving first downlink information that has been transmitted by point-to-multipoint radio communication receivable by a plurality of the mobile terminals 3, and capable of receiving second downlink information that has been transmitted by point-to-point communication. The mobile terminal 3 is capable of transmitting uplink information by point-to-point radio communication. The first downlink information and the second downlink information are formed such that information to be used in the mobile terminal 3 is obtained when the mobile terminal 3 performs information processing by using both the first downlink information and the second downlink information.

Abstract: Downlink is achieved by point-to-multipoint communication. There is provided a radio communication system 1 that provides information to a mobile terminal 3 via a radio communication device 2 that performs radio communication with the mobile terminal 3. The mobile terminal 3 is capable of receiving first downlink information that has been transmitted by point-to-multipoint radio communication receivable by a plurality of the mobile terminals 3, and capable of receiving second downlink information that has been transmitted by point-to-point communication. The mobile terminal 3 is capable of transmitting uplink information by point-to-point radio communication. The first downlink information and the second downlink information are formed such that information to be used in the mobile terminal 3 is obtained when the mobile terminal 3 performs information processing by using both the first downlink information and the second downlink information.