Dynamic burst length controlling algorithm-based loss differentiation in OBS networks through shared FDL buffers

Abstract

The FDL buffers can have only discrete delay values. Because of this discontinuity, in order to construct the FDL buffers, some parameters such as the offered load, the average data burst length, and the basic delay unit, of which the length of each FDL is consecutive multiples, should be considered. This means that if one or more parameters change, new FDL buffers are required. So, even when one or more parameters change, in order to minimize the effect of the change, a new service differentiation algorithm dynamically controlling data burst length based on a shared-type feedforward FDL architecture is proposed in this paper. Various results show that the algorithm improves fairness between classes and significantly reduces the fluctuation of the number of delay lines for each class.

An approach of data analysis to improve scheduling efficiency in optical burst switched networks

“…An FDL is simply one or more optical fibers used to delay bursts for a fixed and predetermined period of time. Depending on how it is connected to the switching fabric, two different FDL architectures are distinguished: feed‐forward and feedback 21 . In the feed‐forward architecture, each FDL is reserved for one output port (link) and is not shared with other output ports (Figure 7A).…”

“…Depending on how it is connected to the switching fabric, two different FDL architectures are distinguished: feedforward and feedback. 21 In the feed-forward architecture, each FDL is reserved for one output port (link) and is not shared with other output ports (Figure 7A). Therefore, to be able to delay with different delay levels, one FDL bank needs to be used for each output port.…”

A mechanism of QoS differentiation based on offset time and adjusted burst length in OBS networks

“…Regarding the QoS aware scheduling, the proposal in [15] is a combination algorithm that latest available unscheduled channel (LAUC) [16] is called for scheduling the high priority burst in order to keep a low complexity, whereas first fit unscheduled channel with void filling (FFUC-VF) [16] is employed for scheduling the low priority burst in order to exploit idle voids and get a reasonable complexity. The QoS aware contention resolution is probably the most interesting with the proposals based on fiber delay lines (FDLs) [17], deflection routing [18], or a combination of FDLs and deflection routing. In this paper, we focus on the mechanisms of QoS differentiation based on offset time, burst length or both offset time and burst length at ingress nodes.…”