Effective burst preemption in OBS network

Klinkowski, Mirosław; Careglio, Davide; Morató, D.; Sole-Pareta, J.

doi:10.1109/hpsr.2006.1709737

Cited by 7 publications

(7 citation statements)

References 12 publications

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“…To eliminate this effect, in [39] we proposed the Preemption Window (PW) mechanism, which expands look-ahead processing window techniques to the burst preemption context [38]. In this paper, we show that the E-OBS architecture facilitates the support to the PW mechanism.…”

Section: A Principle Of Operationmentioning

confidence: 98%

Performance Overview of the Offset Time Emulated OBS Network Architecture

Klinkowski

Careglio

Sole-Pareta

et al. 2009

J. Lightwave Technol.

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Abstract-Optical burst switching (OBS) control architecture considers two different models for the management of the offset time in the network. The conventional OBS (C-OBS) introduces the offset time in soft-way by delaying the transmission of the burst relative to its control packet in the edge node. Another idea for an OBS architecture (E-OBS) comes from optical packet switching world and it intends to emulate offset time by means of an additional fiber delay unit introduced in the data path at the input port of the nodes. Although C-OBS has attracted lots of attention, in this paper we highlight that it possesses many difficulties that can be entirely removed in E-OBS. Issues such as unfairness in resource reservation, efficiency and complexity of burst scheduling, difficulty with alternative and backup routing, and quality of service (QoS) provisioning are studied. Moreover, E-OBS facilitates the application of several enhanced mechanisms. As an example, in this paper we analyze a QoS application based on a preemption window mechanism, which expands look-ahead processing window technique to the burst preemption context. Results show that this mechanism can achieve the performance of the conventional preemption scheme while avoiding the well-known problem of phantom burst generation.Index Terms-Network architecture, offset time provisioning, optical burst switching (OBS), quality of service (QoS) provisioning.

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Section: A Principle Of Operationmentioning

confidence: 98%

Performance Overview of the Offset Time Emulated OBS Network Architecture

Klinkowski

Careglio

Sole-Pareta

et al. 2009

J. Lightwave Technol.

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“…Cho and Un [16] proposed an M/G/1 channel preemption model given that the service times and the preemption overhead are known. Recently, various channel preemption models were studied in mobile ad hoc networks and optical networks [17][18][19]. As to the works on vertical handoffs, Janise McNair and Fang Zhu [20] were the first to claim that new vertical handoff techniques are needed to manage user mobility in a 4G multi-network environment.…”

Section: Introductionmentioning

confidence: 99%

A channel preemption model for vertical handoff in a WLAN-embedded cellular network

Sheu

Wei

2009

Wireless Netw

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In this paper, a channel preemption model for vertical handoff in a WLAN-embedded cellular network is presented. In a heterogeneous networking environment, since many wireless LANs may be deployed within the coverage of a cellular network, horizontal handoffs among neighboring WLANs and vertical handoffs between a WLAN and the cellular network could occur frequently. Performance in terms of blocking probability of the cellular network can be seriously degraded if the channels are not appropriately allocated. The novelty of this paper is right in that a newly initiated mobile node (MN) outside the WLAN coverage can preempt the channels occupied by an MN inside the WLAN coverage when the cellular channels are completely used up. The channel preempted MN is forced to switch its network access to a WLAN. This proposed channel preemption scheme can effectively reduce the blocking probability while not disrupting any of the existing connections within WLANs. For the purpose of performance evaluation, we build a three-dimension Markov chains to analyze the proposed channel preemption mechanism. We derive the equations of move-in and moveout mobility rates based on the node speed and residence times, respectively. The network performance in terms of the number of active WLAN users, the channel utilization and the channel blocking probability of a cellular network, the preemption probability, and the preempted probability of an MN are calculated. From the analytical results, we observe the performance improvements by varying the node speed and the ratio of WLAN coverage.

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“…In [2] we proposed the Preemption Window (PW) technique which enhances the E-OBS architecture for QoS support. We proved that the problem of phantom bursts is overtaken using such technique while maintaining the same good performance as for the classical burst preemption.…”

Section: Introductionmentioning

confidence: 99%

“…The general drawback of any burst preemptionbased mechanism is that, in case of successful preemption, either the resources reserved for the preempted bursts on outgoing path are wasted or an additional signaling procedure should be carried out in order to release them. In order to avoid wasted resources reservation, in [2] we proposed the Preemption Window (PW) mechanism which enhances the E-OBS for efficient QoS support. In this paper we evaluate exhaustively the performance of the resulting architecture showing all its advantageous with respect to other solutions.…”

mentioning

confidence: 99%

Preemption window mechanism for efficient QoS support in E-OBS network architecture

Careglio

Klinkowski

Sole-Pareta

2008

2008 5th International Conference on Broadband Communications, Networks and Systems

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Abstract-This paper focuses on the problem of quality of service (QoS) provisioning in optical burst switching (OBS) networks. OBS is a promising photonic network technology aiming at efficient transport of IP traffic by means of statistical multiplexing. The lack of optical memories, however, makes this operation quite complicated. Problems such as unfairness in access to the shared transmission resources, facility in adopting alternative and backup routing, scheduling complexity and so on arise in the conventional OBS architecture. In [1] we proposed the offset-time emulated OBS (E-OBS) architecture, which overcomes all these drawbacks by means of distributed provisioning of the offset time in core nodes. Nonetheless it is still difficult to guarantee a certain level of service quality. Burst preemption mechanism, which, alongside with offset-time differentiation, was proven to be the most effective technique for QoS provisioning in OBS networks. The general drawback of any burst preemptionbased mechanism is that, in case of successful preemption, either the resources reserved for the preempted bursts on outgoing path are wasted or an additional signaling procedure should be carried out in order to release them. In order to avoid wasted resources reservation, in [2] we proposed the Preemption Window (PW) mechanism which enhances the E-OBS for efficient QoS support. In this paper we evaluate exhaustively the performance of the resulting architecture showing all its advantageous with respect to other solutions.

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Effective burst preemption in OBS network

Cited by 7 publications

References 12 publications

Performance Overview of the Offset Time Emulated OBS Network Architecture

Performance Overview of the Offset Time Emulated OBS Network Architecture

A channel preemption model for vertical handoff in a WLAN-embedded cellular network

Preemption window mechanism for efficient QoS support in E-OBS network architecture

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