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Method for distributing path delay data over connection-oriented communication network, corresponding device, and machine-readable medium

A path-delay, connection-oriented technology, applied in the direction of data exchange network, electromagnetic network arrangement, multiplexing communication, etc., can solve problems such as large amounts of data, achieve the effects of improving accuracy, minimizing message processing, and improving performance

Inactive Publication Date: 2018-07-13
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This can be data intensive and can cause scalability issues

Method used

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  • Method for distributing path delay data over connection-oriented communication network, corresponding device, and machine-readable medium
  • Method for distributing path delay data over connection-oriented communication network, corresponding device, and machine-readable medium
  • Method for distributing path delay data over connection-oriented communication network, corresponding device, and machine-readable medium

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Embodiment Construction

[0052] figure 1 A system in which embodiments of the invention may be used is shown. The first node 1 has a clock providing an accurate timing reference. The first node 1 has access to a source of accurate timing information, such as a Global Positioning System (GPS) receiver. The second node 2 has a local clock that is synchronized with the clock of the first node 1 . The timing information carried in the packets 8 sent between the first node 1 and the second node 2 allows the second node 2 to synchronize the local clock at the second node 2 with the clock at the first node 1 . A packet network 3 , such as an Ethernet network, connects the first node 1 and the second node 2 . Timing information may include timestamps. For at least a part of the path between the first node 1 and the second node 2 the packets are transmitted over a connection-oriented network 4 . An Optical Transport Network (OTN) will be described as an example of a connection-oriented network. The clock...

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Abstract

The connection-oriented communication network (4) comprises a plurality of interconnected nodes (N1‑N4, 11‑13). Service paths (N1‑N2‑N3‑N4) may be established on the network (4). The path delay data of the traffic path is obtained by using control plane signaling messages between nodes of the traffic path (eg Resource Reservation Protocol-Service Engineering RSVP-TE signaling message). The path delay data may be path delay asymmetry data indicative of an asymmetry in path delay between a forward transfer direction and a reverse transfer direction of the traffic path. Each intermediate node (N2, N3, N4) along the traffic path may form a signaling message for forwarding to a downstream node containing one or more values ​​of the path delay caused by that node, or the accumulated path delay value . Path delays may arise from one or more of mapping delays, forward error correction (FEC) coding, and propagation delays.

Description

technical field [0001] This invention relates to obtaining and distributing path delay data in a connection-oriented communication network, such as an optical communication network. Background technique [0002] There are several applications that require accurate frequency and / or time synchronization references for proper operation. In the case of frequency synchronization, conventional solutions have obtained synchronization from a synchronized stream of data, such as is the case in Time Division Multiplexing (TDM) based networks. [0003] Migration of networks from TDM to packet-based technologies such as Ethernet requires a different approach to synchronization. One way to perform synchronization over a packet-based network is to send packets over the network that carry timestamp information. The timestamp is generated by a master (server) accessing an accurate reference such as the Global Positioning System (GPS). It is possible to provide time synchronization betwee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J3/06H04L12/26
CPCH04J3/0647H04L43/0858H04L43/0864H04B10/27H04J14/08H04L45/12
Inventor E.杜蒂S.鲁菲尼R.策卡特利
Owner TELEFON AB LM ERICSSON (PUBL)
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