IEEE International Conference on Communications, 1997
We consider a model for communications network design that includes the optimal location of switc... more We consider a model for communications network design that includes the optimal location of switches (of which there are several types) and the design of the access and backbone networks. The model is of the integer programming variety, and in order to find its solution, we propose a greedy heuristic that yields a good starting solution and a more sophisticated
ABSTRACT In this paper, for the purpose of service differentiation in opportunistic spectrum acce... more ABSTRACT In this paper, for the purpose of service differentiation in opportunistic spectrum access (OSA) enabled networks, we take different priority queueing disciplines into account as decision variables in a dynamic optimization model. The objective is to optimize, after the departure of each packet, a weighted utility function of the performance of different classes of cognitive radio traffic by dynamically deciding the priority queueing discipline. A dynamic programming (DP) model, which takes into account the channel availability and channel handover recovery periods of the OSA network, is provided for two classes of traffic to solve this problem. Simulation results are presented.
There have been two major algorithmic philosophies for finding the best way to reserve and schedu... more There have been two major algorithmic philosophies for finding the best way to reserve and schedule a burst in optical burst switching (OBS). One such method, called Horizon, proposes to assign the reservation at the end of the reservation list, at the earliest convenience. Another method, called JET (just enough time) consists in exploring the reservation list for the scheduled
The topic of this paper is the evaluation of QoS parameters in live Pre-Wimax environments. The m... more The topic of this paper is the evaluation of QoS parameters in live Pre-Wimax environments. The main contribution is the validation of an analytical delay-jitter behavior model. These models can be used in optimization algorithms in order to provide opportunistic and reliable all-IP networks. It allows understanding the impact of the jitter constraints on the throughput and packet loss in
2012 IEEE International Conference on Communications (ICC), 2012
Abstract We propose a multi-period model to minimize the energy consumption of IP networks while ... more Abstract We propose a multi-period model to minimize the energy consumption of IP networks while guaranteeing the satisfaction of all the traffic demands. Energy savings are achieved by putting into sleep mode cards and chassis. The multi-period optimization is constrained by inter-period limitations necessary to guarantee the stability of the networks. Both exact and heuristic solutions are proposed. Results show that up to 50% of the energy savings can be achieved for realistic test scenarios in networks operated with flow-based ...
ABSTRACT This paper is concerned with a new type of congestion control method that we call antici... more ABSTRACT This paper is concerned with a new type of congestion control method that we call anticipative congestion control, which exploits probabilistic information available at a network node about congestion at other nodes. Motivated by the Internet flows behaving according to the Transmission Control Protocol, we consider a flow with time-varying input stream. We design a Markov decision process model for flow admission control and characterize the Whittle index in a closed form. This index measures the efficiency of flow data transmission at a router. We prove that such an index policy is optimal and that it further implies optimality of threshold policies. We apply the results to obtain an expression of the index for a single-bottleneck flow under several types of fairness criteria.
IEEE International Conference on Communications, 1997
We consider a model for communications network design that includes the optimal location of switc... more We consider a model for communications network design that includes the optimal location of switches (of which there are several types) and the design of the access and backbone networks. The model is of the integer programming variety, and in order to find its solution, we propose a greedy heuristic that yields a good starting solution and a more sophisticated
ABSTRACT In this paper, for the purpose of service differentiation in opportunistic spectrum acce... more ABSTRACT In this paper, for the purpose of service differentiation in opportunistic spectrum access (OSA) enabled networks, we take different priority queueing disciplines into account as decision variables in a dynamic optimization model. The objective is to optimize, after the departure of each packet, a weighted utility function of the performance of different classes of cognitive radio traffic by dynamically deciding the priority queueing discipline. A dynamic programming (DP) model, which takes into account the channel availability and channel handover recovery periods of the OSA network, is provided for two classes of traffic to solve this problem. Simulation results are presented.
There have been two major algorithmic philosophies for finding the best way to reserve and schedu... more There have been two major algorithmic philosophies for finding the best way to reserve and schedule a burst in optical burst switching (OBS). One such method, called Horizon, proposes to assign the reservation at the end of the reservation list, at the earliest convenience. Another method, called JET (just enough time) consists in exploring the reservation list for the scheduled
The topic of this paper is the evaluation of QoS parameters in live Pre-Wimax environments. The m... more The topic of this paper is the evaluation of QoS parameters in live Pre-Wimax environments. The main contribution is the validation of an analytical delay-jitter behavior model. These models can be used in optimization algorithms in order to provide opportunistic and reliable all-IP networks. It allows understanding the impact of the jitter constraints on the throughput and packet loss in
2012 IEEE International Conference on Communications (ICC), 2012
Abstract We propose a multi-period model to minimize the energy consumption of IP networks while ... more Abstract We propose a multi-period model to minimize the energy consumption of IP networks while guaranteeing the satisfaction of all the traffic demands. Energy savings are achieved by putting into sleep mode cards and chassis. The multi-period optimization is constrained by inter-period limitations necessary to guarantee the stability of the networks. Both exact and heuristic solutions are proposed. Results show that up to 50% of the energy savings can be achieved for realistic test scenarios in networks operated with flow-based ...
ABSTRACT This paper is concerned with a new type of congestion control method that we call antici... more ABSTRACT This paper is concerned with a new type of congestion control method that we call anticipative congestion control, which exploits probabilistic information available at a network node about congestion at other nodes. Motivated by the Internet flows behaving according to the Transmission Control Protocol, we consider a flow with time-varying input stream. We design a Markov decision process model for flow admission control and characterize the Whittle index in a closed form. This index measures the efficiency of flow data transmission at a router. We prove that such an index policy is optimal and that it further implies optimality of threshold policies. We apply the results to obtain an expression of the index for a single-bottleneck flow under several types of fairness criteria.
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