Transmission of data over a low-bandwidth communication channel
Disclosed herein are various systems and methods that may improve the transmission of data over low-bandwidth communication channels in an electric power delivery system. Devices communicating across a low-bandwidth communication channel may implement several approaches, according to various embodiments disclosed herein, to reduce the data transmitted across the low-bandwidth communication channel and to prioritize the transmission of time-sensitive and/or more important information with respect to other data. Various embodiments disclosed herein may inspect packets to be transmitted across a low-bandwidth communication channel in order to identify high priority data. High priority data may be time-sensitive information, and accordingly, transmission of such data may be prioritized over other data in order to reduce transmission latency of the higher priority data.
1. A method for transmitting a stream of message over a communication channel between stations in an electric power delivery system, comprising:
receiving a first message stream according to a first communications protocol, the message stream comprising a first plurality of individual data packets;
parsing each message of the first message stream;
identifying higher priority data and lower priority data contained within each data packet;
generating a second message stream comprising a second plurality of packets according to a second communications protocol in which the higher priority data is prioritized over the lower priority data;
transmitting the second message stream over a communication channel; and
generating a third message stream comprising a third plurality of packets by reformatting the second message stream according to the first communications protocol.
2. The method of claim 1 , wherein transmitting the second message stream comprises transmitting the second message stream using a network radio.
3. The method of claim 1 , wherein generating the third message stream comprises ordering packets in the third message stream to reduce transmission latency of the higher priority data.
4. The method of claim 1 , further comprising:
generating an abbreviated representation of a time stamp associated with a data value comprised within the first message stream;
transmitting the abbreviated representation of the time stamp in the second data stream; and
regenerating the time stamp comprised within the first message stream.
5. The method of claim 4 , further comprising inserting into the third message stream a regenerated heartbeat signal based upon a heartbeat signal in the first message stream.
6. The method of claim 4 , further comprising incrementing a sequence number in the third message stream based upon an abbreviated representation of the sequence number transmitted in the second message stream.
7. The method of claim 6 , further comprising periodically transmitting the sequence number in the second message stream.
8. The method of claim 1 , further comprising
generating an abbreviated representation of a static data value comprised within the first message stream;
transmitting the abbreviated representation of the static data value in the second message stream;
regenerating the static data value in the third message stream based upon the abbreviated representation.
9. The method of claim 1 , wherein the higher priority data comprises one of a Boolean payload and a data state change indicator.
10. The method of claim 1 , wherein the lower priority data comprises one of an analog payload, an origin MAC address, a destination MAC address, a VLAN tag, and a priority tag, an Ethertype field, and a reserved field.