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Method and apparatus for optimizing packet timing transport

A technology of timing grouping and data grouping, applied in the field of networking, can solve the problems of transparent clock security, unacceptable use of transparent clocks, etc., to eliminate asymmetry, reduce complex and high-cost parts, and ensure quality.

Active Publication Date: 2012-07-18
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] In particular, transparent clocks can also lead to security issues because packets are modified even if they are not terminated in network nodes, which usually means that the use of transparent clocks in telecom applications is unacceptable

Method used

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  • Method and apparatus for optimizing packet timing transport
  • Method and apparatus for optimizing packet timing transport
  • Method and apparatus for optimizing packet timing transport

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Embodiment Construction

[0059] An embodiment of the present invention will now be described with reference to the accompanying drawings, in which the same or similar parts or steps are provided with the same or similar reference numerals.

[0060] The following description is applicable to either time (phase) synchronization applications or frequency synchronization applications (or both).

[0061] In the case of time (phase) synchronization, a basic assumption is that the master-to-slave delay is the same as the slave-to-master delay.

[0062] This means that any asymmetry in the packet network can significantly affect the performance of the delivered time synchronization reference.

[0063] Frequency synchronization applications are only sensitive to timing packet jitter (where jitter can only be in the direction from frequency master to slave if a unidirectional approach is used, or in both directions if a bidirectional approach is used), whereas Time synchronization always depends on the packet ...

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PUM

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Abstract

There is provided a method of optimising timing packet transport in a network node, the method comprising using a locally available stable frequency reference at the network node to provide a pre-determined network node transit time for timing packets in at least one direction into or out of the network node. There is also provided a network node comprising a locally available stable frequency reference and circuitry adapted to apply a pre-determined network node transit time, L, to all timing packets transiting the network node in at least one direction into or out of a network node dependent on the locally available stable frequency reference.

Description

technical field [0001] In general, the present invention relates to networking, and in particular, the present invention relates to an improved packet timing transmission mechanism. Background technique [0002] There are many network applications that require accurate frequency and / or time synchronization references for proper operation, eg mobile communication technologies such as Global System for Mobile Communications (GSM), Wideband Code Division Multiple Access (WCDMA) and Long Term Evolution (LTE). [0003] A traditional timing solution is to have network nodes synchronize their local clocks from the synchronized data streams used to connect the network nodes together, as for example in the case of Time Division Multiplexing (TDM) based networks, but the network never The transition from TDM to cheaper packet-based technologies such as Ethernet requires a different approach. In such packet-based networks, data from a first end node to a second end node (for example, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06
CPCH04J3/0673H04J3/0664H04J3/0697
Inventor S・鲁菲尼O・托斯卡诺R・菲奥罗内
Owner TELEFON AB LM ERICSSON (PUBL)
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