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Congestion control in optical burst exchange network

A technology for optical burst switching and networking, which is applied in data switching networks, selection devices for multiplexing systems, digital transmission systems, etc.

Inactive Publication Date: 2004-07-28
ALCATEL LUCENT SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, such queues do not exist in the optical field, therefore, it is not trivial for those skilled in the art to implement the RED algorithm based on the queue length

Method used

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  • Congestion control in optical burst exchange network
  • Congestion control in optical burst exchange network
  • Congestion control in optical burst exchange network

Examples

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Embodiment Construction

[0044] figure 2 A block diagram of the core router CORE is depicted. The core router CORE includes the following functional blocks:

[0045] - Optical switching matrix OSW, which consists of a wavelength / space switching structure;

[0046] -Switching control unit SCU, responsible for processing BHP and configuring optical switching matrix OSW accordingly;

[0047] - Fiber delay lines FDL, each of which is a multiple of a delay unit DU;

[0048] - input fiber delay line IFDL, providing a time budget for compensation for the processing latency of the BHP in the switching control unit SCU;

[0049] - channel adaptation units IMAP and OMAP, providing adaptation functions between the internode transport domain and the internal node channel domain;

[0050] -Optical / electrical converter O / E and electro-optical converter E / O.

[0051] The core router CORE can transmit from any input fiber IF 1 ~IF N Any data burst of any data channel is switched to any output fiber OF 1 ~of ...

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Abstract

The present invention proposes a method to control congestion in an Optical Burst Switched (OBS) network. The method consists in dropping probabilistically a data burst based on an average delay applied to a set of data bursts. Data bursts start being preventively dropped when the average delay goes beyond a pre-determined threshold. <??>At the edge of the OBS network, one may further segregate data packets into 2 distinct flows, depending on whether or not they convey congestion responsive traffic, each flow being next aggregated into distinct data bursts. The content type of a data burst is indicated in some field of the burst header packet (BHP), allowing the core routers downwards to selectively drop data bursts.

Description

technical field [0001] The invention relates to a method for controlling traffic congestion in an optical burst switching network, and a core router of the optical burst switching network and an edge router of the optical burst switching network for realizing the method. Background technique [0002] In IEEE Journal vol.18 in October, 2000, the article titled "Control Architecture in Optical Burst-Switched WDMNetworks" published in the communication field of NO.10 describes the optical burst switching (Optical Burst Switching, OBS) The basic concepts are given, and the overall architecture of core routers and edge routers in the OBS network is given. [0003] The rapid development of the Internet urgently requires higher transmission capacity and high-speed Internet Protocol (IP) routers with unprecedented speed. Moreover, the emergence of Dense Wavelength Division Multiplexing (D-WDM) technology has greatly improved the transmission capacity of optical fibers. In this tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L47/32H04Q11/00
CPCH04Q2011/0064H04L47/10H04Q2011/0084H04L47/283H04Q11/0066H04L47/32H04L47/43
Inventor F·波普G·H·M·珀蒂K·J·F·E·莱文斯
Owner ALCATEL LUCENT SAS
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