Distributed resource scheduling in not-aligned optical cell switching

M. Rodelgo-Lacruz, C. López-Bravo, F. J. González-Castano, H. Jonathan Chao, F. Gil-Castiñeira

Research output: Contribution to journalArticle

Abstract

Most all-optical switching paradigms assume that different wavelengths are switched independently, which limits scalability. In optical cell switching (OCS), time is divided into time slots of fixed size by time-division multiplexing, and the wavelengths in a time slot are all bundled. Thus, each OCS switch (OCX) has a single switching plane and performs mere time-space switching. In OCS, each OCX requires optical slot synchronizers (OSYNs) at all inputs for the arrival slots to be aligned, so that cells can be simultaneously forwarded. In a recent OCS paradigm -not-aligned OCS-, the OSYNs and the alignment process are no longer required. Cell shifting still takes place inside the OCXs for minimizing the gaps between cells, but it is not necessary to align them to a reference time. Not-aligned OCS has clear advantages over aligned OCS: the total number of fiber delay loops (FDLs) and the hardware cost are reduced, and the number of switching operations is also lower. Moreover, cell arrival time to the switch is not critical, and the network becomes simpler and more flexible. In this paper, we propose a new distributed resource scheduling algorithm for not-aligned OCS networks, which takes connection blocking probability to reasonable values for practical loads.

Original languageEnglish (US)
Article number5439323
Pages (from-to)1201-1212
Number of pages12
JournalIEEE Transactions on Communications
Volume58
Issue number4
DOIs
StatePublished - Apr 2010

Fingerprint

Scheduling
Switches
Wavelength
Time division multiplexing
Blocking probability
Switching networks
Scheduling algorithms
Scalability
Hardware
Fibers
Costs

Keywords

  • All-optical network
  • OCS
  • Optical packet switching
  • Scheduling algorithm

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Rodelgo-Lacruz, M., López-Bravo, C., González-Castano, F. J., Chao, H. J., & Gil-Castiñeira, F. (2010). Distributed resource scheduling in not-aligned optical cell switching. IEEE Transactions on Communications, 58(4), 1201-1212. [5439323]. https://doi.org/10.1109/TCOMM.2010.04.080610

Distributed resource scheduling in not-aligned optical cell switching. / Rodelgo-Lacruz, M.; López-Bravo, C.; González-Castano, F. J.; Chao, H. Jonathan; Gil-Castiñeira, F.

In: IEEE Transactions on Communications, Vol. 58, No. 4, 5439323, 04.2010, p. 1201-1212.

Research output: Contribution to journalArticle

Rodelgo-Lacruz, M, López-Bravo, C, González-Castano, FJ, Chao, HJ & Gil-Castiñeira, F 2010, 'Distributed resource scheduling in not-aligned optical cell switching', IEEE Transactions on Communications, vol. 58, no. 4, 5439323, pp. 1201-1212. https://doi.org/10.1109/TCOMM.2010.04.080610
Rodelgo-Lacruz M, López-Bravo C, González-Castano FJ, Chao HJ, Gil-Castiñeira F. Distributed resource scheduling in not-aligned optical cell switching. IEEE Transactions on Communications. 2010 Apr;58(4):1201-1212. 5439323. https://doi.org/10.1109/TCOMM.2010.04.080610
Rodelgo-Lacruz, M. ; López-Bravo, C. ; González-Castano, F. J. ; Chao, H. Jonathan ; Gil-Castiñeira, F. / Distributed resource scheduling in not-aligned optical cell switching. In: IEEE Transactions on Communications. 2010 ; Vol. 58, No. 4. pp. 1201-1212.
@article{7baa77fa4de54d24b6623410a5372566,
title = "Distributed resource scheduling in not-aligned optical cell switching",
abstract = "Most all-optical switching paradigms assume that different wavelengths are switched independently, which limits scalability. In optical cell switching (OCS), time is divided into time slots of fixed size by time-division multiplexing, and the wavelengths in a time slot are all bundled. Thus, each OCS switch (OCX) has a single switching plane and performs mere time-space switching. In OCS, each OCX requires optical slot synchronizers (OSYNs) at all inputs for the arrival slots to be aligned, so that cells can be simultaneously forwarded. In a recent OCS paradigm -not-aligned OCS-, the OSYNs and the alignment process are no longer required. Cell shifting still takes place inside the OCXs for minimizing the gaps between cells, but it is not necessary to align them to a reference time. Not-aligned OCS has clear advantages over aligned OCS: the total number of fiber delay loops (FDLs) and the hardware cost are reduced, and the number of switching operations is also lower. Moreover, cell arrival time to the switch is not critical, and the network becomes simpler and more flexible. In this paper, we propose a new distributed resource scheduling algorithm for not-aligned OCS networks, which takes connection blocking probability to reasonable values for practical loads.",
keywords = "All-optical network, OCS, Optical packet switching, Scheduling algorithm",
author = "M. Rodelgo-Lacruz and C. L{\'o}pez-Bravo and Gonz{\'a}lez-Castano, {F. J.} and Chao, {H. Jonathan} and F. Gil-Casti{\~n}eira",
year = "2010",
month = "4",
doi = "10.1109/TCOMM.2010.04.080610",
language = "English (US)",
volume = "58",
pages = "1201--1212",
journal = "IEEE Transactions on Communications",
issn = "0090-6778",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "4",

}

TY - JOUR

T1 - Distributed resource scheduling in not-aligned optical cell switching

AU - Rodelgo-Lacruz, M.

AU - López-Bravo, C.

AU - González-Castano, F. J.

AU - Chao, H. Jonathan

AU - Gil-Castiñeira, F.

PY - 2010/4

Y1 - 2010/4

N2 - Most all-optical switching paradigms assume that different wavelengths are switched independently, which limits scalability. In optical cell switching (OCS), time is divided into time slots of fixed size by time-division multiplexing, and the wavelengths in a time slot are all bundled. Thus, each OCS switch (OCX) has a single switching plane and performs mere time-space switching. In OCS, each OCX requires optical slot synchronizers (OSYNs) at all inputs for the arrival slots to be aligned, so that cells can be simultaneously forwarded. In a recent OCS paradigm -not-aligned OCS-, the OSYNs and the alignment process are no longer required. Cell shifting still takes place inside the OCXs for minimizing the gaps between cells, but it is not necessary to align them to a reference time. Not-aligned OCS has clear advantages over aligned OCS: the total number of fiber delay loops (FDLs) and the hardware cost are reduced, and the number of switching operations is also lower. Moreover, cell arrival time to the switch is not critical, and the network becomes simpler and more flexible. In this paper, we propose a new distributed resource scheduling algorithm for not-aligned OCS networks, which takes connection blocking probability to reasonable values for practical loads.

AB - Most all-optical switching paradigms assume that different wavelengths are switched independently, which limits scalability. In optical cell switching (OCS), time is divided into time slots of fixed size by time-division multiplexing, and the wavelengths in a time slot are all bundled. Thus, each OCS switch (OCX) has a single switching plane and performs mere time-space switching. In OCS, each OCX requires optical slot synchronizers (OSYNs) at all inputs for the arrival slots to be aligned, so that cells can be simultaneously forwarded. In a recent OCS paradigm -not-aligned OCS-, the OSYNs and the alignment process are no longer required. Cell shifting still takes place inside the OCXs for minimizing the gaps between cells, but it is not necessary to align them to a reference time. Not-aligned OCS has clear advantages over aligned OCS: the total number of fiber delay loops (FDLs) and the hardware cost are reduced, and the number of switching operations is also lower. Moreover, cell arrival time to the switch is not critical, and the network becomes simpler and more flexible. In this paper, we propose a new distributed resource scheduling algorithm for not-aligned OCS networks, which takes connection blocking probability to reasonable values for practical loads.

KW - All-optical network

KW - OCS

KW - Optical packet switching

KW - Scheduling algorithm

UR - http://www.scopus.com/inward/record.url?scp=77950608130&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77950608130&partnerID=8YFLogxK

U2 - 10.1109/TCOMM.2010.04.080610

DO - 10.1109/TCOMM.2010.04.080610

M3 - Article

VL - 58

SP - 1201

EP - 1212

JO - IEEE Transactions on Communications

JF - IEEE Transactions on Communications

SN - 0090-6778

IS - 4

M1 - 5439323

ER -