Abstract
Burst contention occurs when attempting to transmit several optical bursts at the time into the same core router output port. This is a shortcoming of the Optical Burst Switching (OBS) networks and for this reason it has been challenging to implement the OBS mode into the transport networks so far. This problem can be solved applying various contention resolution strategies at core nodes (fiber delay lines, wavelength conversion or deflection routing). The following question arises: how does data transmission through the OBS network quality depend on using such strategy combination in the core node? For these reasons an analytical model has been created to find out what impact a joint application of various contention resolution strategies has on the data transmission quality. An algorithm has been proposed for the burst service in the OBS core router when a contention arises. The authors suggest applying burst segmentation only for the lower priority bursts, reducing the lower priority data losses in the case of mixed priority burst incoming flow. Every additional burst collision resolution strategy increases the time spent at the node however, so it is highly important to determine by means of simulations the optimal amount of resources needed at the core node. DOI: http://dx.doi.org/10.5755/j01.eee.20.6.7288
Highlights
Optical bursts are transmitted directly through the bufferless optical wavelength division multiplexing (WDM) network, with exception of using of buffers in the network edge routers [1]
A solution has been proposed to reduce the burst losses in case of burst contention in highly loaded Optical Burst Switching (OBS) network core nodes
An analytical model has been created for the OBS core node to find out what impact has an application of various contention resolution strategies on the data transmission quality
Summary
Optical bursts are transmitted directly through the bufferless optical wavelength division multiplexing (WDM) network, with exception of using of buffers in the network edge routers [1]. Bursts can be lost at a single or few OBS network core nodes in the case of contention, even when network is low loaded because of the lack of one way signalling adaptation and general scheduling [1], [3]–[6]. One can solve this problem in changing configuration parameters of edge and core routers, for example the burst length or interval of bursts assembly and bursts scheduling. A number of comprehensive reviews of different contention resolution techniques for optical burst switched network have been presented [1], [10], [11]
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