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This paper addresses the problem of controlling the performance of optical burst switching (OBS) networks in presence of non-stationary traffic demands. We propose a joint burst admission control and forwarding mechanism that operates in core nodes. This mechanism dynamically adapts its behaviour according to the feedback messages received from other nodes. By not forwarding certain bursts not complying...
To meet the demanded bandwidth requirements of future optical communication networks, more dynamism, scalability and automatism will need to be provided, which will require, as well, new control plane designs to respond to network changes very rapidly. In this work, we propose the use of an ant colony optimization (ACO) algorithm to support the routing and wavelength assignment in wavelength continuity...
In this paper, a new MAC protocol for OBS networks is introduced, described and evaluated. Into operation, DAOBS avoids burst collisions in the core of the network by controlling the way OBS nodes access the optical channel. Assuming no wavelength conversion capabilities in the network, DAOBS is assessed and compared to standard deflection routing through simulations. From the results, DAOBS offers...
The prospects of optical burst switching (OBS) as a cost-effective optical networking paradigm depend both on the complexity of the network nodes deployed and on the network performance attained. Contention resolution devices, namely wavelength converters and fibre delay line (FDL) buffers, and the size of the optical space switch matrix determine, to a large extent, the complexity of the core nodes...
The emerging high bandwidth and on-demand user applications require improvements in capacity, configurability and resiliency in next generation optical access networks to incrementally expand on the basis of customers requirements. New architectures and technologies are needed to achieve also scalability and active traffic adaptation. In this article an all-optical merger of access and metro networks...
This article addresses the dynamic provisioning of optical connections within a GMPLS-enabled translucent wavelength switched optical network with sparse 3R regenerators. To this end, an OSNR-based IRWA algorithm computes routes that aim at satisfying both restrictions: the wavelength continuity constraint and adequate end-to-end optical signal quality. If either constraint cannot be satisfied, the...
Optical burst switching and packet switching require the adoption of suitable contention resolution mechanisms at the optical nodes due to multiple packets/bursts attempting to access the shared output channel at the same time. Contentions can be solved by exploiting the space, wavelength and time domain. The many alternatives possible call for suitable scheduling policy aiming at an optimal system...
Optical burst switching (OBS) provides statistical time multiplexing in the optical domain. A key feature to core networks, it is problematic for access lines. Scarce resources per customer require collision avoidance in the uplink respectively pre-planned scheduling. The just-enough-time (JET) one-way signalling scheme provides neither option. To achieve end-to-end burst switching, solutions for...
This paper introduces a new strategy to provide QoS in IP/OBS networks, using routing with prioritization based on statistics (RPBS). This proposal uses the feedback scheme in optical networks to provide statistical knowledge with the objective of finding a suitable route for reach each destination from a specific source node, with more chance of success. This yields a twofold outcome. First, the...
In this paper, we investigate the effect of grooming segment-based traffic on statistical multiplexing gain using simplified edge-node models of optical burst switching (OBS) networks. The objective is to multiplex different bursts on the same output wavelength in order to optimize the bandwidth utilization on the optical fiber. We introduce a particular structure of the burst header packet (BHP)...
Optical burst switching (OBS) was proposed as an alternative optical switching paradigm, in order to overcome the limitations of optical circuit and optical packet switching paradigms. In OBS networks, resource reservation protocol plays a key role for better resource allocation along the path from source to destination data transmission. In this paper, we focus and consider some of the relevant one-way...
This paper investigates an optical burst switching (OBS) based Grid architecture, where Grid traffic is assumed to co-exist with IP/10GE traffic. In Grid networks, the address of the handling resource is of less significance as different resources can process the job. Therefore anycast routing is implemented to route the Grid job bursts. This implies that Grid jobs are assembled in separate bursts...
In this paper, we present a survey comparing different deflection routing based techniques applied to optical burst switching (OBS) networks. For such study we consider the E-OBS architecture proposed in which is an advantageous solution for OBS networks since routing decision can be taken freely inside the network without constraints on the length of the path. Under this environment, several effective...
In this paper, we investigate experimentally the impact of optical amplifiers, namely Erbium Doped Fiber Amplifiers (EDFA) on Optical Burst Switching (OBS) networks, operating at 2.5 Gb/s (typical bit rate for current passive optical networks - PON). Bursts with 212 - 1 and 216 - 1 pseudo random binary sequence (PRBS) were studied, with different idle times (from 2 mus to 80 mus). The use of traffic...
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