Gjergji Mino

Goodput and PDR analysis of AODV, OLSR and DYMO protocols for vehicular networks using CAVENET

A Vehicular Ad-Hoc Network (VANET) is a form of Mobile Ad-Hoc Network (MANET), which enables communication between vehicles and nearby roadside infrastructure through a wireless sensing device installed in vehicles. In VANETs and MANETs, the topology of network changes very often, therefore implementation of efficient routing protocols is very important problem. In VANETs, the mobility pattern of nodes is restricted along roads and is affected by movement of neighbour nodes. In this paper, we present a simulation system for VANET called CAVENET. In CAVENET, the mobility patterns of nodes are generated by one-dimensional cellular automaton. We implemented three routing protocols on CAVENET (AODV, OLSR and DYMO) and investigated their performance. We considered as evaluation metrics for simulation goodput and Packet Delivery Ratio (PDR). The simulation results have shown that DYMO protocol has better performance than AODV and OLSR protocols.

A Fuzzy-Based CAC Scheme for Cellular Networks Considering Security

Call Admission Control (CAC) is one of the resource management functions, which regulates network access to ensure QoS provisioning. However, the decision for CAC is very challenging issue due to user mobility, limited radio spectrum, and multimedia traffic characteristics. In this paper, we propose a new CAC scheme which considers for acceptance decision except other parameters also the security. We call the proposed system FACS-S (Fuzzy Admission Control - with Security). We evaluated by simulations the performance of proposed system and show that the FACS-S has a good behavior.

FBMIS: A Fuzzy-Based Multi-interface System for Cellular and Ad Hoc Networks

Several solutions have been proposed for improving the Quality of Service (QoS) in wireless cellular networks, such as Call Admission Control (CAC) and handover strategies. However, none of them considers the usage of different interfaces for different conditions. In this work, apart from using only Base Stations (BSs) as an important device of cellular networks, we propose a multi-interface approach in order to avoid BS overloads and improve the QoS of wireless communications. We propose a system, where each node is equipped with two interfaces: the traditional cellular network interface and Mobile Ad hoc Networks (MANET) interface. The main difficulty for this system is how to choose the right interface in order to guarantee a minimal usage of network resources and at the same time keeping the communication performance in a satisfactory level. For this purpose, in this paper we propose a Fuzzy-Based Multi-Interface System (FBMIS), where each node is able to switch from cellular to Ad hoc and vice versa. We consider three input parameters and one output parameter. From the simulation results, our system shows a good performance.

A CAC Scheme Based on Fuzzy Logic for Cellular Networks Considering Security and Priority Parameters

Call Admission Control (CAC) is one of the resource management functions, which regulates network access to ensure QoS provisioning. However, the decision for CAC is very challenging issue due to user mobility, limited radio spectrum, and multimedia traffic characteristics. In this paper, we propose a new CAC scheme which considers for acceptance decision except other parameters also the security and priority. We call the proposed system FACS-SP (Fuzzy Admission Control - with Security and Priority). We evaluated by simulations the performance of proposed system and show that the FACS-SP has a good behavior.

Performance Evaluation of Wireless Sensor Networks for Mobile Sink Considering Consumed Energy Metric

Sensor networks are a sensing, computing and communication infrastructure that are able to observe and respond to phenomena in the natural environment and in our physical and cyber infrastructure. The sensors themselves can range from small passive micro-sensors to larger scale, controllable weather-sensing platforms. To reduce the consumed energy of a large scale sensor network, we consider a mobile sink node in the observing area. In this work, we investigate how the sensor network performs in the case when the sink node moves. We compare the simulation results for two cases: when the sink node is mobile and stationary considering lattice and random topologies using AODV protocol. The simulation results have shown that for the case of mobile sink, the consumed energy is better than the stationary sink (about half of stationary sink in lattice topology). Also for mobile sink, the consumed energy of lattice topology is better than random topology.

VANET Simulators: A Survey on Mobility and Routing Protocols

Vehicular Ad-hoc Networks (VANETs) are an instance of Ad-hoc networks, which are general-purpose distributed wireless networks interconnected without the need of any centralized infrastructure. VANETs are expected to be massively deployed in upcoming vehicles, because their use can improve the safety of driving and makes new forms of inter-vehicle communications possible as well. The simulation of VANETs requires two different components: a vehicular traffic simulator, capable to provide an accurate mobility model for the nodes of a VANET, and a network simulator, for simulating the behavior of a wireless network. In this paper, we provide a survey of mobility models proposed for VANETs. We analyze challenges and future perspectives of VANET simulators and current routing solutions for VANET.

A Fuzzy-Based Call Admission Control Scheme for Wireless Cellular Networks Considering Priority of On-going Connections

The mobile cellular systems are expected to support multiple services with guaranteed Quality of Service (QoS).But, the ability of wireless systems to accommodate expected growth of traffic load and broadband services is limited by available radio frequency spectrum. Call Admission Control (CAC) is one of the resource management functions, which regulates network access to ensure QoS provisioning. However, the decision for CAC is very challenging issue due to user mobility, limited radio spectrum, and multimedia traffic characteristics. In our previous work, we proposed a fuzzy-based CAC system and compared the performance of the proposed system with Shadow Cluster Concept (SCC). In this work, we extend our work by considering the priority of the on-going connections. We evaluate by simulations the performance of the proposed system and compare its performance with our previous work. The performance evaluation shows that the proposed system has a good behavior in keeping the QoS of on-going connections.

Performance evaluation of a fuzzy-based CAC scheme for wireless cellular networks: a case study considering priority of on-going connections

The mobile cellular systems are expected to support multiple services with guaranteed Quality of Service (QoS). But, the ability of wireless systems to accommodate expected growth of traffic load and broadband services is limited by available radio frequency spectrum. Call Admission Control (CAC) is one of the resource management functions, which regulates network access to ensure QoS provisioning. However, the decision for CAC is very challenging issue due to user mobility, limited radio spectrum, and multimedia traffic characteristics. In our previous work, we proposed a fuzzy-based CAC system and compared the performance of the proposed system with Shadow Cluster Concept (SCC). In this work, we extend our work by considering the priority of the on-going connections. We evaluate by simulations the performance of the proposed system and compare its performance with our previous work. The performance evaluation shows that the proposed system has a good behaviour in keeping the QoS of on-going connections.

Implementation of CAVENET and its usage for performance evaluation of AODV, OLSR and DYMO protocols in vehicular networks

Vehicle Ad-hoc Network (VANET) is a kind of Mobile Ad-hoc Network (MANET) that establishes wireless connection between cars. In VANETs and MANETs, the topology of the network changes very often, therefore implementation of efficient routing protocols is very important problem. In MANETs, the Random Waypoint (RW) model is used as a simulation model for generating node mobility pattern. On the other hand, in VANETs, the mobility patterns of nodes is restricted along the roads, and is affected by the movement of neighbour nodes. In this paper, we present a simulation system for VANET called CAVENET (Cellular Automaton based VEhicular NETwork). In CAVENET, the mobility patterns of nodes are generated by an 1-dimensional cellular automata. We improved CAVENET and implemented some routing protocols. We investigated the performance of the implemented routing protocols by CAVENET. The simulation results have shown that DYMO protocol has better performance than AODV and OLSR protocols.

Implementation and performance evaluation of two fuzzy-based handover systems for wireless cellular networks

Wireless mobile networks and devices are becoming increasingly popular to provide users the access anytime and anywhere. We are witnessing now an unprecedented demand for wireless networks to support both data and real-time multimedia traffic. The wireless mobile systems are based on cellular approach and the area is covered by cells that overlap each other. In mobile cellular systems the handover is a very important process. Many handover algorithms are proposed in the literature. However, to make a better handover and keep the QoS in wireless networks is very difficult task. For this reason, new intelligent algorithms should be implemented to deal with this problem. In this paper, we carried out a comparison study of two handover systems based on fuzzy logic. We implement two Fuzzy-Based Handover Systems (FBHS) called FBHS1 and FBHS2. The performance evaluation via simulations shows that FBHS2 has better behavior than FBHS1 and can avoid ping-pong effect in all simulation cases.