Resolving the fairness issue in bus-based optical access networks

Bouabdallah, Nizar; Dotaro, Emmanuel; Ciavaglia, Laurent; Sauze, Nicolas Le; Pujolle, Guy

doi:10.1109/mcom.2004.1362545

Cited by 17 publications

(20 citation statements)

References 11 publications

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“…We showed in [4] that even if the traffic sourced by upstream nodes, which is regulated by the TB shaper, does not violate the negotiated throughput, it causes unacceptable packet delay to downstream nodes sharing the same channel. Certainly, thanks to TB algorithm the free bandwidth (stated in bit/s) allocated to each node is theoretically sufficient to handle its traffic.…”

Section: The Proposed Protocol: Tcardmentioning

confidence: 97%

“…However, as demonstrated in [4], this same mechanism presents several limitations when dealing with the fairness problem in the case of asynchronous transmission.…”

Section: The Proposed Protocol: Tcardmentioning

confidence: 99%

“…Indeed, we noticed that sharing the common bandwidth fairly but arbitrarily among bus nodes, like in slotted WDM ring, doesn't resolve the fairness problem within asynchronous system. In this regard, we demonstrated in [4] the inherent limitations of the token bucket access rate-based algorithm once applied to asynchronous transmission bus-based networks.…”

Section: Introductionmentioning

confidence: 99%

“…The proposed solution, the so-called TCARD (Traffic Control Architecture using Remote Descriptors) and presented briefly in [4], is based on a preventive mechanism when granting access to the resource, i.e. free bandwidth is reserved by each node according to the traffic requirements of its downstream partners.…”

Section: Introductionmentioning

confidence: 99%

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Efficient Bandwidth Sharing in Bus-Based Optical Access Networks

Beylot

Bouabdallah

Pujolle

2005

NETWORKING 2005. Networking Technologies, Services, and Protocols; Performance of Computer and Communication Networks; Mobile A

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Abstract. Packet-based optical access ring is becoming a promising solution in metropolitan networks. Its performance depends mainly on how optical resource sharing takes place among the different competing access nodes. In such a network fairness issues are likely to arise between upstream and downstream nodes competing to access a common data channel. This paper provides a new protocol called TCARD (Traffic Control Architecture using Remote Descriptors), based on a preventive reservation scheme, to alleviate the fairness problems. The reservation process consists in forcing the upstream nodes to ensure enough available bandwidth for downstream nodes' transmission purpose. Moreover, we develop analytical models in order to assess the access delay when TCARD is enabled. The analytical and simulation results show how the proposed solution alleviates the performance degradation and the resource sub-utilization while achieving fairness among bus nodes.

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Section: The Proposed Protocol: Tcardmentioning

confidence: 97%

“…However, as demonstrated in [4], this same mechanism presents several limitations when dealing with the fairness problem in the case of asynchronous transmission.…”

Section: The Proposed Protocol: Tcardmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Efficient Bandwidth Sharing in Bus-Based Optical Access Networks

Beylot

Bouabdallah

Pujolle

2005

NETWORKING 2005. Networking Technologies, Services, and Protocols; Performance of Computer and Communication Networks; Mobile A

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“…In [13, 14, 15 and 16], authors have presented performance analysis of OPS bus-based networks employing optical CSMA/CA protocol (e.g., the DBORN architecture [2]). Using Jaiswal's [17] and Takagi's [18] results on M/G/1 priority queues, the authors derive mean packet delay at each node for both slotted [13,14,15] and unslotted [14,15,16] modes, which support both fixed and variable length packets. In particular, both [15] and [16] use the same approach to derive the upper and lower bounds of the packet delay at downstream nodes on the unslotted bus-based network.…”

Section: Introductionmentioning

confidence: 99%

A Conditional Probability Approach to Performance Analysis of Optical Unslotted Bus-Based Networks

Brandwajn¹,

Nguyễn²,

Atmaca³

2009

Current Research Progress of Optical Networks

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This paper presents a novel approach to the performance analysis of optical packet switching bus-based networks with unslotted Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) protocol. Because of the interdependence among bus nodes, an accurate performance analysis of such networks has been an open question for a long time. We model the bus as a multiple-priority M/G/1 queuing system with preemptive-repeat-identical (PRI) service discipline. To solve this model, we use a recurrent level-by-level analysis technique where the interference from higher levels (upstream nodes) is taken into account in terms of reappearance and disappearance rates for the server. The key features of this method are as follows. First, it specifically accounts for the distribution of voids seen by a node (via the number of attempts before a successful transmission) as a function of the node's position and offered network load. Second, it approximately computes the queue-length distribution at each node, and thus provides a tool for buffer size selection so as to meet a loss rate criterion. A comparison of our approximate model solution with network simulations indicates that our model generally offers good accuracy in assessing the performance of the network, including in terms of the queue-length distribution. Occasionally, the results of our model may deviate from simulation results. A discussion of the causes of such deviations, most likely to occur when nodes are close to saturation, offers additional insight into the properties of the bus-based network and its approximate solution.

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