in this paper, new features of satellite configuration, such as ip network  based infrastructure and separated signaling and media  are considered to propose a variety of satellite configurations in different orbits. because of their  different altitude in space such as low earth orbit(leo) and geostationary orbit (geo). a test bed used to test call setup delay in a one space link to process th...

Based on queuing theory we develop analytical approximations for the average packet transfer time of a store-and-forward and a cutthrough buffer insertion ring with two client traffic priorities. These types of rings are architectural alternatives for resilient packet rings (RPR) which transport data (e.g., IP) packets over optical media. We use the approximations for a delay comparison of both...

This paper introduces a new packet scheduling algorithm for multi-media traffic. The proposed modified priority queuing (MPQ) packet scheduling algorithm, realizing the high priority traffic service employs exponential distributions with the higher averages respectively, secures the reduction in the mean waiting time regarding the high priority traffic sensitive to delay. Thus, we could meet th...

Quality of Service (QoS) techniques are applied in IP networks to utilize available network resources in the most efficient manner to minimize delays and delay variations (jitters) in network traffic having multiple type of services. Multimedia services may include voice, video and database. Researchers have done considerable work on queuing disciplines to analyze and improve QoS performance in...

In order to promote public transport many municipalities use traffic signal control with a priority for buses or trams. In this paper, we address the problem of finding optimal passive transit signal priority settings. Building on a cyclically time-expanded network model for the combined traffic assignment traffic signal coordination problem, we introduce a suitable queuing model and several mo...

Based on the Extended Colored Stochastic Petri Nets (ECSPN), the workflow system was modeled and simulated. To improve described capacity of the traditional Petri nets, a model of the extended colored stochastic Petri nets is proposed, and then an instance is given to explain how to model workflow system with priority queuing and multi-instances. Through analysis of the simulation data of the m...

The analysis of a preemptive priority queuing system with K ( ≥ 2 ) classes of jobs is undertaken. The system consists of a single processor representing a model of discrete dynamic scheduling problems associated with M k / Gk / 1 / ∞ endogenous priority queues. The processor schedules jobs which arrive according to a Markov arrival process. The process of service is arbitrary. With each job ar...

Regarding the fact that getting a suitable combination of the human resources and service stations is one of the important issues in the most service and manufacturing environments, In this paper, we have studied the two models of planning queuing systems and its effect on the cost of the each system by using two fuzzy queuing models of M/M/1 and M/E2/1. In the first section, we have compar...