The impact of burstification on TCP throughput in optical burst switching networks

We focus on the optimal size a data burst (DB) should have in an Optical Burst Switching (OBS) network in the single wavelength link case. The optimality is understood in the sense of maximizing throughput under the assumption the traffic is TCP controlled. In such networks, packets are assembled into bursts containing several IP packets (burstification). A trade-off takes place between large and small DBs. The former leads to a degradation of throughput due to loss synchronization, a well known problem in TCP controlled traffic, whereas, the latter leads to overhead due to the guard-band intervals. To address the optimal DBs size problem, we use an estimate of throughput obtained through individual TCP connections sharing a common router. The effect on synchronization is thus taken into account. A classical optimization technique is then applied to the resulting goodput formula to determine, the optimal size. Besides, we also examine Fiber Delay Lines (FDL) modeling aspects.

[1]  Marco Listanti,et al.  Impact of segments aggregation on TCP Reno flows in optical burst switching networks , 2002, Proceedings.Twenty-First Annual Joint Conference of the IEEE Computer and Communications Societies.

[2]  Koenraad Laevens,et al.  Quality-of-service differentiation and fairness in optical burst-switched networks , 2002, SPIE ITCom.

[3]  François Baccelli,et al.  AIMD, fairness and fractal scaling of TCP traffic , 2002, Proceedings.Twenty-First Annual Joint Conference of the IEEE Computer and Communications Societies.

[4]  Dohy Hong,et al.  Many TCP User Asymptotic Analysis of the AIMD Model , 2001 .

[5]  Nasir Ghani,et al.  Opticomm 2002: Optical Networking and Communications , 2002 .

[6]  F. Baccelli,et al.  Interaction of TCP flows as billiards , 2003, IEEE INFOCOM 2003. Twenty-second Annual Joint Conference of the IEEE Computer and Communications Societies (IEEE Cat. No.03CH37428).

[7]  Yijun Xiong,et al.  Control architecture in optical burst-switched WDM networks , 2000, IEEE Journal on Selected Areas in Communications.

[8]  Franco Callegati,et al.  Optical buffers for variable length packets , 2000, IEEE Communications Letters.

[9]  François Baccelli,et al.  Flow level simulation of large IP networks , 2003, IEEE INFOCOM 2003. Twenty-second Annual Joint Conference of the IEEE Computer and Communications Societies (IEEE Cat. No.03CH37428).

[10]  Koenraad Laevens,et al.  Segmentation overhead in optical burst switching , 2002, SPIE ITCom.