Papers by Mohammed Sowailem
… IEEE GLOBECOM 2008 …, Jan 1, 2008
An enhanced mathematical model is introdu evaluate the performance of a core node in switched net... more An enhanced mathematical model is introdu evaluate the performance of a core node in switched network. In the proposed model, t traffic arrivals to the OBS node is approxim that the maximum allowed number of arrivals in a given time slot, is two (instead of infinity) diagram is outlined to illustrate the probl mathematical model based on the equilibriu (EPA) technique is presented. The ste throughput is derived from the model whic absence of wavelength conversion capability model is aided by a simulation work w performance of an OBS core node under t Poisson traffic arrivals (the exact case) and calc state system throughput. The results obtained f mathematical model are consistent with that o assuming Poisson traffic arrivals and this consi wide range of traffic load.
Contention resolution in optical burst switched networks using spectral-amplitude-coding optical code division multiple access
Global …, Jan 1, 2009
... scheme is characterized by the zero MAI feature when using the balanced receiver structure [4... more ... scheme is characterized by the zero MAI feature when using the balanced receiver structure [4]. Inspired by the zero MAI feature and ... Mohamed YS Sowailem, student member, IEEE, Mohamed HS Morsy, student member, IEEE, and Hossam MH Shalaby, Senior member, IEEE ...
… Technology, Journal of, Jan 1, 2009
We propose the implementation of spectral-amplitude-coding optical code division multiple access ... more We propose the implementation of spectral-amplitude-coding optical code division multiple access (SAC-OCDMA) as a contention resolution technique in optical burst switched (OBS) networks. The new system architecture is presented in details where an all-optical methodology for cancelling multiple access interference is proposed. Performance evaluation of the proposed system in both MAC and optical layers is introduced where the overall burst error rate of the system is evaluated in three cases: full, partial, and no code conversion capabilities taking into account the receiver dark current, thermal, and shot noises at the egress nodes. Our results reveal that a considerable improvement in the performance of each core node in the system is achieved by using SAC-OCDMA instead of WDM in the optical layer underneath an OBS based MAC layer. We also conclude that a slight increase in the employed number of code converters enhances the overall system performance noticeably. Finally, optimum values for the number of codes, which lead to minimum overall burst error rate, are reached at different traffic conditions.
… (ICT), Jan 1, 2010
A performance analysis of a core node in an OBS network having wavelength converters in the node ... more A performance analysis of a core node in an OBS network having wavelength converters in the node resources is presented. The analysis assumes that the wavelength converters are deployed at the input ports of the node such that the node may have variable wavelength conversion capability. This means that the node may have no, partial or full conversion capability. The no and partial wavelength conversion is imitated by modeling each output port in the node as an M/M/w/w queue with limited server accessibility. Two performance measures are derived from the model; namely, the steady state throughput and the average burst loss probability assuming Poisson traffic arrivals. In addition, a simulation work is performed in order to validate the results of our proposed model. After taking into consideration the cost of the wavelength converters, optimum values for the wavelength conversion capability in the node, which lead to minimum burst loss probability, are reached for different traffic conditions.
… (ICT), Jan 1, 2010
A mathematical model is introduced for performance evaluation of an OBS core node employing eithe... more A mathematical model is introduced for performance evaluation of an OBS core node employing either no or full wavelength conversion strategies. Furthermore, the model assumes long-range dependent (LRD) traffic arrivals to the OBS intermediate node which are accurately modeled by Pareto distribution. In our proposed model, each output port is imitated by a GI/M/w/w queue for which a single performance measure; namely the burst loss probability, is evaluated from the model equations. Also, results of this model are compared with those obtained while assuming short-range dependent (SRD) Poisson arrivals to the core node in the two cases of no and full wavelength conversion. Finally, results show that traditional Poisson traffic models yields over-optimistic performance measures in terms of lower burst loss probability when compared to the more accurate long-range dependent Pareto traffic model. This discrepancy between the two models is much clearer for light traffic scenarios due to the more significant impact of self-similarity.
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Papers by Mohammed Sowailem