A preemption window mechanism based on priority in E-OBS networks
-
1.
School of College of Information Science and Engineering, Henan University of Technology, Zhengzhou 450001, China
-
Corresponding author:
WANG Bo-yun, guanaihonghust@yahoo.com.cn
;
-
Received Date:
2010-07-26
Accepted Date:
2010-09-01
-
Abstract
In order to reduce burst loss probability and guarantee the quality of service (QoS) of optical burst switching(OBS)networks efficiently,a preemption window mechanism based on priority in emulated-OBS networks was proposed,in which a preemption window was set in the control channel of the emulated-OBS core routers to determine whether or not to allow high-priority bursts to preempt low-priority bursts.When competition occurs,the system estimates whether the arrival time of high-priority bursts corresponding to control bursts meets the preemption condition.If the preemption condition is satisfied,highpriority bursts are allowed to preempt low-priority bursts.Otherwise,preemption is not allowed.The theoretical analysis and the simulation experiment of this mechanism were carried out,and a series of data how the loss probability of the different priority bursts changing with the preemption window time in the different channel systems were obtained.Simulation results show that the mechanism can efficiently reduce the burst loss probability of high-priority bursts,and the burst loss probability of the highpriority bursts is much less than that of the low-priority bursts.The QoS of OBS networks is guaranteed by this mechanism. Hence,the scheme can efficiently improve the performance of OBS networks.
-
-
References
|
[1]
|
GNAUCK A,CHARLET G,TRAN P,et al.25.6Tbit/s C +L-band transmissum of polamation multiplexed RZ-DQPSK signals[C]//National Fiber Optic Engineers Conference 2007.Anaheim,Califomia,USA:Optical Society of America,2007:PDP19. |
|
[2]
|
QIAO C,YOO M.Optical burst switching (OBS)-a new paradigm for an optical intemet[J].Journal of High Speed Networks,1999,8(1):69-84. |
|
[3]
|
YOO M,QIAO C,DIXIT S.QoS performance of optical burst switching in IP-over-WDM networks[J].IEEE Journal on Selected Areas in Communications,2000,18(10):2062-2072. |
|
[4]
|
YOO M,QIAO C.Just enoygh time (JET):a high speed protocol for burst traffic in optical networks[J].IEEE/LEOS Technology for a Global Information Infrastructure,1997,8(11/15):26-27. |
|
[5]
|
ZHANG M,ZHANG F,WANG J,et al.Performance of priontized optical burst switching with limited fiber delay lines[J].Acta Photonica Sinica,2002,31 (10):1190-1194(in Chinese). |
|
[6]
|
HERNANDEZ J A,ARACIL J,PEDRO L D,et al.Analysis of blocking probability of data bursts with continuous-time variable offsets in single-wavelength OBS switches[J].Journal of Lightwave Technology,2008,26(12):1559-1568. |
|
[7]
|
KLINKOWSKI M,CAREGLIO D,SOLE-PARETA J,et al.Performance overview of the offset time emulated OBS network architecture[J].Journal of Lightwave Technology,2009,27(14):2751-2764. |
|
[8]
|
LIU Y,QIU Q.Research of FDL structure in OBS core node[J].Laser Technology,2005,29(6):572-578 (in Chinese). |
|
[9]
|
BI F J,ZHANG M,YE P D.A novel prioritized scheme for contention resolution in optical burst switched networks[J].Acta Photonica Sinica,2005,34(6):900-904 (in Chineae). |
|
[10]
|
HOU R,SUN J Q,DING P F.Study on a priority based contention resolution for optical burst switching networks[J].Journal of Electronics & Information Technology,2006,28(4):747-751 (in Chinese). |
-
-
Proportional views
-
Map
DownLoad: