Transmission of data over a low-bandwidth communication channel

• US 9,363,200 B2
• Filed: 02/18/2014
• Issued: 06/07/2016
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: Schweitzer Engineering Laboratories, Incorporated
• Original Assignee: Schweitzer Engineering Laboratories, Incorporated
• Inventors: Kasztenny, Bogdan Z., Tibbals, Timothy P., Dolezilek, David J., Day, Benjamin S., Bradetich, Ryan, Bennett, Jerry J., Achanta, Shankar V.
• Primary Examiner(s): HA, DAC V
• Application Number:
  US14/763,474
• Publication Number:
  US 20150358253A1
• Time in Patent Office: 840 Days
• US Class Current: 1/1
• CPC Class Codes: H04B 3/54 Systems for transmission via power distribution lines
• CPC Class Codes: H04L 43/106 using time related information in packets, e.g. by adding timestamps
• CPC Class Codes: H04L 45/30 Routing of multiclass traffic
• CPC Class Codes: H04L 47/2475 for supporting traffic characterised by the type of applications
• CPC Class Codes: H04L 47/805 QOS or priority aware
• CPC Class Codes: H04L 69/08 Protocols for interworking; Protocol conversion
• CPC Class Codes: H04L 69/18 Multiprotocol handlers, e.g. single devices capable of handling multiple protocols
• CPC Class Codes: H04W 28/02 Traffic management, e.g. flow control or congestion control
• CPC Class Codes: H04W 72/00 Local resource management

Abstract

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.

Claims

1. A system configured to transmit a stream of message over a communication channel in an electric power delivery system, the system comprising:

a communications interface configured to receive a first message stream according to the first communications protocol, the message stream comprising a first plurality of individual data packets;

a packet parsing system configured to parse each message of the first message stream and to identify higher priority data and lower priority data contained within each data packet; and

a protocol translation system configured to generate a second message stream comprising a second plurality of packets according to a second format in which higher priority data is prioritized over the lower priority data;

wherein the second message stream is transmitted over the communication channel via the communications interface.

2. The system of claim 1, wherein the communications interface comprises a radio transmitter configured to transmit the second message stream.

3. The system of claim 1, further comprising a static data module configured to identify a static data value comprised within the first message stream and to generate an abbreviated representation of static data to be transmitted in the second message stream.

4. The system of claim 1, further comprising a time module configured to identify a time stamp comprised within the first message stream and to generate an abbreviated representation of the time stamp to be transmitted in the second message stream.

5. The system of claim 4, wherein the abbreviated representation comprises an increment of time elapsed from a previously transmitted time value.

6. The system of claim 1, wherein the second plurality of packets second message stream is ordered to reduce transmission latency of the higher priority data.

7. The system of claim 1, wherein the first communications protocol comprises GOOSE protocol.

8. The system of claim 7, wherein the higher priority data comprises a Boolean payload.

9. The system of claim 7, wherein the higher priority data comprises an indication of a data state change.

10. The system of claim 9, 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.

11. The system of claim 1, wherein the first communications interface comprises a first communication port and a second communication port, the first communication port configured to receive the first message stream, and the second communication port configured to transmit the second message stream.

12. The system of claim 11, wherein the second communication port comprises a network radio.

13. The system of claim 12, wherein the system further comprises one of an analog contact input/output port and a binary contact input/output port.

14. The system of claim 13, wherein the protocol translation system is further configured to receive a signal via one of the analog contact input/out port and the binary contact input/output port and to insert into the second message stream at least one packet representing the signal.

15. A system configured to transmit a stream of message over a communication channel between stations in an electric power delivery system, comprising:

a first device configured to communicate according to a first protocol and a second protocol, the first device comprising;

a first communications interface configured to receive a first message stream according to the first communications protocol, the message stream comprising a first plurality of individual data packets;

a first packet parsing system configured to parse each message of the first message stream and to identify higher priority data and lower priority data contained within each data packet;

a first protocol translation system configured to generate a second message stream comprising a second plurality of packets according to a second format in which higher priority data is prioritized over the lower priority data;

wherein the second message stream is transmitted over the communication channel via the first communications interface;

a second device configured to communicate according to the first protocol and the second protocol, the second device comprising;

a second communications interface configured to receive the second message stream; and

a second protocol translation system configured to generate a third message stream comprising a third plurality of packets by reformatting the second message stream according to the first protocol.