Interworking agent adapted to interact between network and precision time protocol entities

Patent metadata

Field	Value
Publication number	US-9209921-B2
Application number	US-201113810271-A
Country	US
Kind code	B2
Filing date	Jun 29, 2011
Priority date	Jul 15, 2010
Publication date	Dec 8, 2015
Grant date	Dec 8, 2015

Abstract

The embodiments of the present invention refer to an interworking agent aimed at being installed in a network node comprising a Precision Time Protocol “PTP” module, said agent comprising:
a synchronization-side interface configured to
measure Precision Time Protocol “PTP” metrics for detecting a Precision Time Protocol “PTP” signal failure, read and modify Precision Time Protocol “PTP” parameters of the Precision Time Protocol “PTP” module,
at least one network-side interface configured to
measure network metrics for selecting the optimal path for packet synchronization signals monitor network events for detecting a network path change, read and modify
signals exchanged with a network planning entity and, signals exchanged between network nodes at the network level in order to communicate with remote interworking agents located in other network nodes.

First claim

What is claimed is:

1. Interworking agent aimed at being installed in a network node comprising a Precision Time Protocol “PTP” module, said agent comprising:
a synchronization-side interface configured to
measure Precision Time Protocol “PTP” metrics for detecting a Precision Time Protocol “PTP” signal failure,
read and modify Precision Time Protocol “PTP” parameters of the Precision Time Protocol “PTP” module,

at least one network-side interface configured to
measure network metrics for selecting an optimal path for packet synchronization signals
monitor network events for detecting a network path change,
read and modify
signals exchanged with a network planning entity and,
signals exchanged between network nodes at a network level in order to communicate with remote interworking agents located in other network nodes,

the said interworking agent also comprises communication means between the synchronization side interface and the network-side interface to inform one interface of events occurring on the other interface.

2. Interworking agent in accordance with claim 1 wherein the network planning entity is a network control plane and the signals exchanged with the network control plane comprise network control messages.

3. Interworking agent in accordance with claim 2 wherein the network control messages comprise Resource Reservation Protocol “RSVP” or its Traffic Engineering extension “RSVP-TE” signaling messages and wherein at least one field modifiable by an interworking agent network-side interface comprises a POLICY_DATA object.

4. Interworking agent in accordance with claim 2 wherein the network control messages are Label Distribution Protocol “LDP” messages and wherein at least one field modifiable by an interworking agent network-side interface comprises an added network parameter Type Length Value “TLV” as an extension of Label Distribution Protocol “LDP”.

5. Interworking agent in accordance with claim 1 wherein the network planning entity is an Operation, Administration and Maintenance “OAM” Plane and the signals exchanged with the OAM plane comprise maintenance signals transmitted at the physical level or at the layer 2 level of the Open Systems Interconnection “OSI” model.

6. Interworking agent in accordance with claim 5 wherein the OAM plane comprises an Ethernet OAM functionality as referred by the IEEE 802.1 ag or IEEE 802.3 ah or ITU-T Y.1731 Recommendations.

7. Interworking agent in accordance with claim 5 wherein the OAM plane comprises a Multiprotocol Label Switching “MPLS” OAM functionality as referred by the Request for Comments “RFC” 5860.

8. Interworking agent in accordance with claim 1 wherein the network planning entity comprises a network management plane.

9. Interworking agent in accordance with claim 1 , wherein the Precision Time Protocol “PTP” metrics comprise:
Packet Delay Variation (PDV) values and/or,
link and Network node transit delay values and delay asymmetry values and/or,
ITU-T G.781 Quality Levels of the local equipment clock and/or,
values identifying an IEEE 1588 V2 Transparent Clock, an IEEE 1588 V2 Boundary Clock or a physical layer based syntonization support such as the ITU-T synchronous Ethernet or SONET/SDH technologies.

10. Interworking agent in accordance with claim 1 , wherein the Precision Time Protocol “PTP” module comprises an IEEE 1588 V2 transparent clock or an IEEE 1588 V2 boundary clock or an IEEE 1588 V2 ordinary clock.

11. Interworking agent in accordance with claim 1 , wherein a Precision Time Protocol “PTP” signal failure corresponds to a degradation of the Precision Time Protocol “PTP” flow characteristics above a predefined threshold during a predefined observation duration so that a targeted synchronization performance cannot be achieved.

12. Network node comprising
a Precision Time Protocol “PTP” module and,
an interworking agent, said interworking agent comprising:
a synchronization-side interface configured to
measure Precision Time Protocol “PTP” metrics for detecting a Precision Time Protocol “PTP” signal failure,
read and modify Precision Time Protocol “PTP” parameters of the Precision Time Protocol “PTP” module,
at least one network-side interface configured to
measure network metrics for selecting an optimal network path for synchronization signal,
monitor network events for detecting a network path change,
read and modify
signals exchanged with a network planning entity and,
signals exchanged between network nodes at a network level in order to communicate with remote interworking agents located in other network nodes.

13. Network comprising a plurality of nodes, at least some of the said nodes comprising
a Precision Time Protocol “PTP” module and,
an interworking agent, said interworking agent comprising:
a synchronization-side interface configured to
measure Precision Time Protocol “PTP” metrics for detecting a Precision Time Protocol “PTP” signal failure,
read and modify Precision Time Protocol “PTP” parameters of the Precision Time Protocol “PTP” module,
at least one network-side interface configured to
measure network metrics for selecting an optimal network path for packet synchronization signals,
monitor network events for detecting a network path change,
read and modify
signals exchanged with a network planning entity and,
signals exchanged between network nodes at a network level in order to communicate with remote interworking agents located in other network nodes.

14. Method for reconfiguring and supporting time distribution in a network using a Precision Time Protocol “PTP” using interworking agents implemented in network nodes comprising a Precision Time Protocol “PTP module, said interworking agents comprising:
a synchronization-side interface configured to
measure Precision Time Protocol “PTP” metrics for detecting a Precision Time Protocol “PTP” signal failure,
read and modify Precision Time Protocol “PTP” parameters of the Precision Time Protocol “PTP” module,
at least one network-side interface configured to
measure network metrics for selecting an optimal path for packet synchronization signals,
monitor network events for detecting a network path change,
read and modify
signals exchanged with a network planning entity and,
signals exchanged between network nodes at a network level in order to communicate with remote interworking agents located in other network nodes
wherein,
in case of detection of a Precision Time Protocol “PTP” signal failure, signals exchanged with a network planning entity are modified to inform said network planning entity of a Precision Time Protocol “PTP” signal failure in order to trigger an automatic path change of a Precision Time Protocol “PTP” flow from a current working path to a protected path and,
in case of a detection of a path change,
signals exchanged between network nodes are modified to inform remote interworking agents located in other network nodes along a Precision Time Protocol “PTP” time distribution chain of a new Precision Time Protocol “PTP” parameters corresponding to the protected path, said new parameters being then communicated by said remote interworking agents to their local Precision Time Protocol “PTP” module.

Assignees

• Bui Dinh Thai
• Le Pallec Michel
• Ciavaglia Laurent
• Alcatel Lucent

Inventors

• Bui Dinh Thai
• Le Pallec Michel
• Ciavaglia Laurent

Classifications

• H04J3/0667

  Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays (arrangements for monitoring round trip delays in packet switching networks H04L43/0864) · CPC title

• H04J3/0697 Primary

  Synchronisation in a packet node · CPC title

• H04J3/14

  Monitoring arrangements {(for SDH/SONET rings H04J3/085)} · CPC title

• H04J2203/006

  Fault tolerance and recovery · CPC title

• H04J3/0658

  Clock or time synchronisation among packet nodes · CPC title