Direct encapsulation of sensor data over ethernet
A sensor bridge, for use in an Ethernet network in a vehicle, includes a sensor interface, a mapper and a communication processor. The sensor interface is configured to receive sensor data from a sensor installed in the vehicle. The mapper is configured to form mapped sensor data by applying to the sensor data a direct mapping that maps specified parts of the sensor data to corresponding bit positions in one or more Ethernet packets. The communication processor is configured to generate the one or more Ethernet packets including the mapped sensor data, and to transmit the one or more Ethernet packets over the Ethernet network.
1 . A sensor bridge for use in an Ethernet network in a vehicle, the sensor bridge comprising:
a sensor interface, configured to receive sensor data from a sensor installed in the vehicle;
a mapper, configured to:
hold a direct mapping that maps specified parts of the sensor data to corresponding bit positions in one or more Ethernet packets; and
populate a memory buffer with the received sensor data in accordance with the direct mapping, wherein the memory buffer is preconfigured according to a format of the Ethernet packets and has respective memory locations designated to buffer the specified parts of the sensor data; and
a communication processor, configured to generate the one or more Ethernet packets comprising the sensor data buffered in the memory buffer, and to transmit the one or more Ethernet packets over the Ethernet network.
2 . The sensor bridge according to claim 1 , wherein the mapper is further configured to add to the mapped sensor data, at specified positions, routing information for routing the one or more Ethernet packets in the Ethernet network.
3 . The sensor bridge according to claim 1 , wherein the mapper is further configured to add to the mapped sensor data, at specified positions, Operations, Administration and Management (OAM) information for transmission in the one or more Ethernet packets.
4 . The sensor bridge according to claim 1 , wherein the mapper is configured to map the sensor data with a latency that does not exceed one microsecond.
5 . A method for transmitting sensor data in an Ethernet network in a vehicle, the method comprising:
receiving sensor data from a sensor installed in the vehicle;
holding a direct mapping that maps specified parts of the sensor data to corresponding bit positions in one or more Ethernet packets;
populating a memory buffer with the received sensor data in accordance with the direct mapping, wherein the memory buffer is preconfigured according to a format of the Ethernet packets and has respective memory locations designated to buffer the specified parts of the sensor data; and
generating the one or more Ethernet packets comprising the sensor data buffered in the memory buffer, and transmitting the one or more Ethernet packets over the Ethernet network.
6 . The method according to claim 5 , wherein applying the direct mapping further comprises adding to the mapped sensor data, at specified positions, routing information for routing the one or more Ethernet packets in the Ethernet network.
7 . The method according to claim 5 , wherein applying the direct mapping further comprises adding to the mapped sensor data, at specified positions, Operations, Administration and Management (OAM) information for transmission in the one or more Ethernet packets.
8 . The method according to claim 5 , wherein applying the direct mapping comprises mapping the sensor data with a latency that does not exceed one microsecond.