Nader Mbarek

A user assistant for QoS negotiation in a dynamic environment using agent technology

This paper presents an assistant to help the user in negotiating the desired quality of service in a dynamic environment using the agent technology. A multi-agent system is proposed in order to solve problems and accomplish tasks in a distributed and autonomous way. This user assistant negotiates dynamically the QoS (quality of service) on the users behalf, follows the users behavior to be able to predict his future location in wireless networks, anticipate the negotiation and manage the re-negotiation. The negotiation can take place in two different manners, using agents that will reach an agreement with the best provider or using a dynamic negotiation protocol called SLN NSLP.

Autonomic Brokerage Service for an End-to-End Cloud Networking Service Level Agreement

Today, cloud networking which is the ability to connect the user with his cloud services and to interconnect these services within an inter-cloud approach, is one of the recent research areas in the cloud computing research communities. The main drawback of cloud networking consists in the lack of Quality of Service (QoS) assurance and management in conformance with a corresponding Service Level Agreement (SLA). In this paper, we propose a framework for self-establishing an end-to-end service level agreement between a Cloud Service User (CSU) and multiple Cloud Service Providers (CSPs) in a cloud networking environment using brokerage service. We focus on QoS parameters for NaaS and IaaS services. This framework ensures a self-establishing of the proposed SLA using autonomic cloud managers. Moreover, videoconferencing is a very demanding application in terms of bandwidth, delay and CPU resources that we have to guarantee. Therefore, we propose to use our cloud networking architecture and framework to provide the cloud videoconferencing application with QoS guarantee. We simulate the corresponding scenario using the CloudSim toolkit to evaluate its performance. The results reveal a high scalability, and a good video conferencing delay.

A Negotiation Protocol Using Web Services in a Self-Management Framework

Autonomic systems interaction is a challenging area of research. We describe a framework for service level negotiation within self-management systems using two kinds of interactions: vertical and horizontal. In the proposed framework, we provide autonomic systems with a new interaction capability thanks to the negotiation with their peers. The negotiation process occurs between high-level autonomic managers to guarantee an end-to-end service level for specific application traffic flows. To be in conformance with the concepts of self-aware management systems, the proposed negotiation protocol called SLNP uses the interoperable Web services technologies. We present implementation results to evaluate the SLNP negotiation time according to a specific scenario.

Performance evaluation of the HWMP proactive tree mode for IEEE 802.11s based Wireless Mesh Networks

The IEEE 802.11s standard defines a path selection algorithm, named HWMP (Hybrid Wireless Mesh Protocol) which combines on-demand path selection mode with a proactive tree building mode. The proactive tree building mode in HWMP periodically maintains the routing table according to a constant value. Varying this value will affect directly the number of messages transmission, the accuracy of the routing table and delays for path recovery. Frequent messages transmission will cause high overhead but improves the accuracy of the routing table. On the other hand, big tree updates intervals may cause long delays for path recovery in case of a broken link. In this paper we propose a performance evaluation of the HWMP proactive tree mode. Indeed, we vary the periods of messages transmitted for two different topologies of Wireless Mesh Network (WMN) functioning as a backbone based on IEEE 802.11s standard and generating the same traffic. By consequent we expect improving QoS requirement.

Priority levels based multi-hop broadcasting method for vehicular ad hoc networks

This paper deals with broadcasting problem in vehicular ad hoc networks (VANETs). This communication mode is commonly used for sending safety messages and traffic information. However, designing an efficient broadcasting protocol is hard to achieve since it has to take into account some parameters related to the network environment, for example, the network density, in order to avoid causing radio interferences. In this paper, we propose a novel Autonomic Dissemination Method (ADM) which delivers messages in accordance with given priority and density levels. The proposed approach is based on two steps: an offline optimization process and an adaptation to the network characteristics. The first step uses a genetic algorithm to find solutions that fit the network context. The second one relies on the Autonomic Computing paradigm. ADM allows each vehicle to dynamically adapt its broadcasting strategy not only with respect to the network density, but also in accordance to the priority level of the message to send. The experimental results show that ADM effectively uses the radio resources even when there are globally many messages to send simultaneously. Moreover, ADM allows to increase the message delivery ratio and to reduce the latency and radio interferences.

Broker and federation based Cloud networking architecture for IaaS and NaaS QoS guarantee

Today, the Cloud networking aspect is a critical factor for adopting the Cloud computing approach. The main drawback of Cloud networking consists in the lack of Quality of Service (QoS) guarantee and management in conformance with a corresponding Service Level Agreement (SLA). This paper presents a framework for resource allocation according to an end-to-end SLA established between a Cloud Service User (CSU) and several Cloud Service Providers (CSPs) in a Cloud networking environment. We focus on QoS parameters for Network as a Service (NaaS) and Infrastructure as a Service (IaaS) services. In addition, we propose algorithms for the best CSPs selection to allocate Virtual Machines (VMs) and network resources in inter-cloud broker and federation scenarios. Our objective is to minimize the cost while satisfying NaaS and IaaS QoS constraints. Moreover, we simulate our proposed Cloud networking architecture to provide videoconferencing and intensive computing applications with QoS guarantee. We observe that the broker architecture is the most interesting while ensuring QoS requirements.

Service Level Negotiation in Autonomous Systems Management

We propose a framework for service level negotiation in autonomous systems management. The negotiation process occurs between high-level autonomic managers to guarantee an end-to-end service level for specific application traffic flows. In the proposed framework, we provide autonomous systems with a new interaction opportunity thanks to the negotiation with their peers. To be in conformance with self-aware management systems, the proposed negotiation protocol called SLNP is used in a Web services environment

Self-establishing a Service Level Agreement within autonomic cloud networking environment

Today, cloud networking which is the ability to connect the user with his cloud services and to interconnect these services within an inter-cloud approach, is one of the recent research areas in the cloud computing research communities. The main drawback of cloud networking consists in the lack of Quality of Service (QoS) guarantee and management in conformance with a corresponding Service Level Agreement (SLA). Several research works have been proposed for the SLA establishing in cloud computing, but not in cloud networking. In this paper, we propose an architecture for self-establishing an end-to-end service level agreement between a Cloud Service User (CSU) and a Cloud Service Provider (CSP) in a cloud networking environment. We focus on QoS parameters for NaaS and IaaS services. The architecture ensures a self-establishing of the proposed SLA using autonomic cloud managers.

End-to-end service level negotiation protocol for self-management networks

We propose a framework for service level negotiation within s elf-management systems. The negotiation process occurs between high-level autonomic managers to guarantee an end-to-end service level for specific application traffic flows. In the proposed framework, we provide autonomic systems with a new interaction opportunity thanks to the negotiation with their peers. To be in conformance with the concepts of self-aware management systems, the proposed negotiation protocol called SLNP is used in a Web Services environment.RésuméNous proposons un schéma pour la négociation du niveau de service dans le cadre d’une gestion autonome des systèmes. La procédure de négociation se déroule entre des gestionnaires autonomes de haut niveau afin de garantir un niveau de service de bout en bout pour un trafic donné. Dans le schéma proposé, une nouvelle opportunité s’offre aux systèmes autonomes grâce à la possibilité de négociation des gestionnaires autonomes de haut niveau avec leurs homologues. Dans un souci de conformité avec les concepts de la gestion autonome, le protocole de négociation SLNP, que nous spécifions, est utilisé dans un environnement standardisé de technologies de Services Web.

Hybrid QoS based routing protocol for inter and intra wireless mesh infrastructure communications

Quality of service (QoS) in wireless mesh networks is an active area of research, which is driven by the increasing demand for real-time and multimedia applications, such as Voice over IP and Video on Demand. In this paper, we propose a novel QoS based routing protocol for wireless mesh infrastructure, called Hybrid QoS Mesh Routing (HQMR). It is composed of two QoS based routing sub-protocols: a reactive multi-metric routing protocol for intra-infrastructure communications and a proactive multi-tree based routing protocol for communications with external networks. The proposed routing protocol enables forwarding real-time and streaming applications with QoS guarantee in a mesh wireless environment, by assigning a specific routing path for each defined service class. To this end, three different QoS service classes are defined, depending on the applications requirements. We analyze in this paper the simulation results of different scenarios conducted on the network simulator ns-3 to demonstrate the effectiveness of the HQMR protocol and to compare it to other routing protocols while forwarding real-time applications with QoS guarantee.