AN EFFECTIVE USAGE PARAMETER CONTROL MODEL FOR CELL POLICING IN ATM NETWORKS

The primary role of traffic control procedures is to protect the network so that it can achieve the required network performance objectives and yield a high quality of service (QoS). To guarantee the QoS, the network implements traffic control using the parameters agreed upon at the start of data transfer, thus avoiding problems with degraded QoS before they occur. This paper presents an efficient model for policing cells transmitted over ATM networks. The model was simulated by a program written in Java. From several simulation test runs and subsequent analysis, it can be deduced that the model gives a minimal cell transfer rate at a minimum intercell period, while the cell delay variation tolerance is held constant. Optimal cell loss ratio is also achieved when the minimum intercell period is held constant and the cell delay variation tolerance is high. The results show minimal cell loss ratio has been achieved and the data throughput of the model is high.

Quality of Service Aware Call Admission Control in Cell Based Multi-Service Photonic Network

The article tackles the problem of quality of service assurance in photonic networks. The idea of multi-servicephotonic network model with the coexistence of optical circuit and packet switching mechanisms and cell communication is used as a basis for service differentiation in the optical domain. Cell loss ratio as a key performance indicator determines the required optical switching mechanism. Service provisioning is performed using call admission control mechanism with real-time cell loss ratio estimation procedure. Service blocking probability calculation utilizes discrete event simulation of service provision and teardown requests applied to core network topology from COST 266 project. Three simulation scenarios are included in the analysis – pure optical packet switching network, and coexistence of optical packet and circuit switching with and without possibility of communication redirection between the switching mechanisms. Simulation scenarios are additionally altered with the cell loss ratio constraint and number of delay lines.

Approaches to Performance Analysis of Packed Switched Optical Ring

Approaches to Performance Analysis of Packed Switched Optical Ring An optical ring network employing optical packet switching is investigated. An analytical approach allowing the computation of end-to-end cell loss ratio (CLR) is proposed. The CLR dependence on topological parameters (number of stations), network parameters (number of wavelengths), and node structure (buffer capacity) is computed assuming a uniform traffic load. A discrete event simulation confirms the analytical results.