SYSTEMS AND METHODS UTILIZING LARGE PACKET SIZES TO REDUCE UNPREDICTABLE NETWORK DELAY VARIATIONS FOR TIMING PACKETS

• US 20120207178A1
• Filed: 01/17/2012
• Published: 08/16/2012
• Est. Priority Date: 02/11/2011
• Status: Abandoned Application

• Current Assignee: Anue Systems Inc (Keysight Technologies, Inc.)
• Original Assignee: Anue Systems Inc (Keysight Technologies, Inc.)
• Inventors: Webb, Charles A. III
• Application Number:
  US13/352,106
• Publication Number:
  US 20120207178A1
• Time in Patent Office: Days
• US Class Current: 370/429
• CPC Class Codes: H04J 3/0658 Clock or time synchronisation among packet nodes
• CPC Class Codes: H04L 47/365 Dynamic adaptation of the packet size

Abstract

Systems and methods are disclosed for utilizing large packet sizes to reduce unpredictable network delay variations in delivering timing packets across networks for use with respect to network timing protocols. By increasing the size of the timing packets, the disclosed embodiments reduce or eliminate the blocking effect caused by size differences between timing packets and relatively large packets carried through a packet network. By reducing or eliminating this blocking effect, the disclosed embodiments provide significant advantages in reducing the complexity of implementing robust timing protocols for handling unpredictable delays in the communication of timing packets. The size of timing packets can be increased, for example, by adding fill data to timing data to form large timing packets. A variety of large packet sizes can be used for the timing packets, and timing packets can preferably be made to be equal to the maximum transmission unit (MTU) for the network.

Claims

1. A network system, comprising:

a device coupled to a network, the device comprising;

a packet interface configured to transmit network packets through a network, the network utilizing a network protocol allowing for variable packet sizes; and

a timing packet generator configured to provide a plurality of timing packets to the packet interface for transmission through the network to one or more receiving devices, the timing packet generator being configured to form the plurality of timing packets by combining timing data with additional fill data; and

one or more network nodes configured to receive and process network packets including the plurality of timing packets, the one or more network nodes being configured to store network packets before forwarding them and to complete transmission of network packets once transmission has started.

2. The network system of claim 1, wherein the additional fill data comprises data that is intended for use by a receiving device.

3. The network system of claim 1, wherein the additional fill data comprises data that will be discarded by a receiving device.

4. The network system of claim 1, wherein the plurality of timing packets have a size of between twenty-five percent to one hundred percent of a maximum packet size for the network.

5. The network system of claim 4, wherein the plurality of timing packets have a size of between ninety percent to one hundred percent of a maximum packet size for the network.

6. The network system of claim 5, wherein the plurality of timing packets have a size equal to a maximum packet size for the network.

7. The network system of claim 1, wherein the device comprises a timing master device.

8. The network system of claim 7, further comprising a timing slave device coupled to receive the plurality of timing packets through the one or more network nodes, the timing slave device comprising a timing packet interface configured to receive timing packets from the packet interface and a timing packet parser configured to receive the timing packets and to obtain timing data from the received timing packets.

9. The network system of claim 1, wherein the packet interface is further configured to receive timing packets from the network, and wherein the device further comprises a timing packet parser configured to receive timing packets from the packet interface, the timing packet parser being configured to obtain timing data from the received timing packets.

10. The network system of claim 1, wherein the network protocol comprises the Ethernet protocol.

11. The network system of claim 1, wherein the timing packet generator is configured to utilize a timing protocol comprising at least one of PTP (Precise Time Protocol) and NTP (Network Time Protocol).

12. A network device, comprising:

a packet interface configured to transmit network packets through a network, the network utilizing a protocol allowing for variable packet sizes, and the network utilizing network nodes configured to store network packets before forwarding them to receiving devices and to complete transmission of network packets once transmission has started; and

a timing packet generator configured to provide timing packets to the packet interface for transmission through the network to one or more receiving devices, the timing packet generator being configured to form timing packets by combining timing data with additional fill data.

13. The network device of claim 12, wherein the additional fill data comprises data that is intended for use by a receiving device.

14. The network device of claim 12, wherein the additional fill data comprises data that will be discarded by a receiving device.

15. The network device of claim 12, wherein the plurality of timing packets have a size of between twenty-five percent to one hundred percent of a maximum packet size for the network.

16. The network device of claim 15, wherein the plurality of timing packets have a size of between ninety percent to one hundred percent of a maximum packet size for the network.

17. The network device of claim 16, wherein the plurality of timing packets have a size equal to a maximum packet size for the network.

18. The network device of claim 12, wherein the packet interface is further configured to receive timing packets from the network, and wherein the device further comprises a timing packet parser configured to receive timing packets from the packet interface, the timing packet parser being configured to obtain timing data from the received timing packets.

19. The network device of claim 12, wherein the network protocol comprises the Ethernet protocol.

20. The network device of claim 12, wherein the timing packet generator is configured to utilize a timing protocol comprising at least one of PTP (Precise Time Protocol) and NTP (Network Time Protocol).

21. A method for network communications, comprising:

forming a plurality of timing packets by combining timing data with additional fill data; and

transmitting the plurality of timing packets through a network using one or more network nodes, the network utilizing a network protocol allowing for variable packet sizes, and the one or more network nodes being configured to store network packets before forwarding them and to complete transmission of network packets once transmission has started.

22. The method system of claim 21, further comprising using additional fill data intended for use by a receiving device.

23. The method of claim 21, further comprising additional fill data intended to be discarded by a receiving device.

24. The method of claim 21, wherein the forming step comprises forming the plurality of timing packets to have a size of between twenty-five percent to one hundred percent of a maximum packet size of the network.

25. The method of claim 21, wherein the forming step comprises forming the plurality of timing packets to have a size of between ninety percent to one hundred percent of a maximum packet size of the network.

26. The method of claim 21, wherein the forming step comprises forming the plurality of timing packets to have a size equal to a maximum packet size of the network.

27. The method of claim 21, wherein the network protocol comprises the Ethernet protocol.

28. The method of claim 21, further comprising utilizing a timing protocol comprising at least one of PTP (Precise Time Protocol) and NTP (Network Time Protocol).

29. The method of claim 21, further comprising receiving the plurality of timing packets and obtaining timing data from the plurality of timing packets.

30. The method of claim 29, further comprising performing the forming and transmitting steps using a timing master device and performing the receiving and obtaining steps using a timing slave device.

31. The method of claim 21, further comprising utilizing a fixed packet size for the plurality of timing packets.

32. The method of claim 21, further comprising utilizing a variable packet size for the plurality of timing packets.