Iftikhar Ahmad | Mirpur University of Science and Technology (MUST) (original) (raw)

Papers by Iftikhar Ahmad

Paper

properly cited. Vehicular Ad Hoc Networks (VANETs) are rapidly gaining attention due to the diver... more properly cited. Vehicular Ad Hoc Networks (VANETs) are rapidly gaining attention due to the diversity of services that they can potentially offer. However, VANET communication is vulnerable to numerous security threats such as Distributed Denial of Service (DDoS) attacks. Dealing with these attacks in VANET is a challenging problem. Most of the existing DDoS detection techniques suffer from poor accuracy and high computational overhead. To cope with these problems, we present a novel Multivariant Stream Analysis (MVSA) approach. The proposed MVSA approach maintains the multiple stages for detection DDoS attack in network. The Multivariant Stream Analysis gives unique result based on the Vehicle-to-Vehicle communication through Road Side Unit. The approach observes the traffic in different situations and time frames and maintains different rules for various traffic classes in various time windows. The performance of the MVSA is evaluated using an NS2 simulator. Simulation results demonstrate the effectiveness and efficiency of the MVSA regarding detection accuracy and reducing the impact on VANET communication.

ABSTACT Real time applications are getting increasing popularity in almost all kinds of networks,... more ABSTACT Real time applications are getting increasing popularity in almost all kinds of networks, including MANETs. The support for these applications on best effort network, like IPN, requires the development of protocols that can guarantee a certain level of Quality of Service (QoS). This paper is concerned with a routing protocol for MANETs that provides QoS guarantees using the Time Slot Bandwidth Reservation (TSBR) method. This technique reserves larger bandwidth for real time data thus reducing the queuing delay. In this paper, we propose enhancement in the popular AODV routing protocol to provide QoS support for real time traffic in MANETs. The simulation results show the performance advantages achieved using the proposed protocol over the basic AODV.

Cognitive radio based inter vehicle communication system was proposed by the researchers in 2010.... more Cognitive radio based inter vehicle communication system was proposed by the researchers in 2010. They have proposed cognitive radio site (CR-Site) inside the vehicle to solve the problems associated with the single radio access technologies (GSM/GPRS, CDMA, Wi-Fi) based IVC systems. Our main work is regarding the introduction of multi-homing module in CR-Site. After receiving quality of service (QoS) parameters from application cognitive system monitor (CSM) initiates white space optimization module to optimize the white spaces package according to the requested QoS parameters. GA optimizes the white spaces and sends them into the optimized white spaces pool. On the reception of admission acceptance, application sends the data for transmission to the scheduler via CSM. Scheduler initiates its sub module devisor to divide the data into the packets according to the smallest bandwidth in the optimized whitespace package. Then these packets are sent using multi white spaces in parallel fashion. Simulation and analytical experiments reveal that using multi-homing heavy files (videos and text) can be transmitted in less time as compared to the non multi-homed single RAT (GSM or CDMA or LTE) based V2V communication systems.

The technologies like Wi-Fi, Blue tooth, WiMax etc. have made Mobile Ad hoc Networks common in ou... more The technologies like Wi-Fi, Blue tooth, WiMax etc. have made Mobile Ad hoc Networks common in our Real life. Multi-media applications need to be supported on MANET. A certain level of QoS (Quality of Service) support is essential for Real time data. Our proposed protocol provides the required QoS without having negative impact on Best Effort data traffic. An efficient rout discovery mechanism for AODV routing protocol as well as transmission technique for real time data are proposed. This technique gives more transmission opportunities to real time data traffic results in decreasing transmission delay and increasing throughput. A modified version of the popular AODV routing protocol to provide QoS guarantee for real time traffic in MANETs is proposed. The simulation shows better performance results for proposed protocol over the basic AODV. .

MANET is a temporary connection of mobile nodes via wireless links having no centralized base sta... more MANET is a temporary connection of mobile nodes via wireless links having no centralized base station. We developed a protocol with an enhanced route discovery mechanism that avoids the pre-transmission delay. When a source node wants to communicate with another node, it broadcast RREQ. EAODV give priority to the source node of real time transmission. When RREQ packet send to neighbor node, for real time transmission it accept route request on priority basis and the drop ratio of packets decreased, then throughput increases by receiving more packets at destination and delivery ratio also increased through these QOS improved.

— Excessive load on the MANET is the main reason for link breakage and performance degradation. A... more — Excessive load on the MANET is the main reason for link breakage and performance degradation. A congested node in the network dies more quickly than other nodes. A good load balancing technique share the traffic load evenly among all the nodes those can take part in transmission. Transferring of load from congested nodes to less busy nodes and involvement of other nodes in transmission that can take part in route can improve the overall network life. We proposed a load balancing scheme for AODV that improves overall network life, throughput and reduce average end to end delay.

—Mobile ad hoc network is wireless network of mobile nodes, with no centralized management and co... more —Mobile ad hoc network is wireless network of mobile nodes, with no centralized management and control. We proposed a protocol with an enhanced route discovery mechanism that avoids the congestion in the route. Our proposed protocol selects route on the basis of traffic load on the node and resets path as the topology changes. Instead of transmitting entire data through one route, new efficient paths are discovered from time to time during transmission. This is an efficient technique for transmissions that requires a link for longer period of time.

—MANET is defined as a collection of mobile nodes with no central management, running on batterie... more —MANET is defined as a collection of mobile nodes with no central management, running on batteries and changing topology. The aim of this paper is to make the existing AODV routing protocol efficient by with an enhanced route discovery mechanism which reduces transmission delay that is caused due to path instability. When a source node want to communicate with another node it broadcast RREQ.In EAODV RREQ message afield is reserved for obtaining the node remaining energy and that route will be selected which has greater average remaining energy. This will reduce transmission delay and increase throughput. We implement proposed solution in NS2.

A mobile ad hoc network (MANET) is a wireless, dynamic, infrastructure-less, self-organized, mult... more A mobile ad hoc network (MANET) is a wireless, dynamic, infrastructure-less, self-organized, multi-hop, and decentralized network. Each node in MANET can act as a router as well as a work station. Many routing protocols have been developed to increase the efficiency of MANET. The primary objective of this paper is a detailed QoS comparison of reactive (AODV), proactive (DSDV), and hybrid (ZRP) routing protocols of MANET in order to find which routing protocol works best in a particular network scenario. The analysis was made for TCP-based traffic patterns. The performance differentials were analyzed on the basis of normalized routing overhead, packet loss, packet delivery ratio, control packets, end-to-end delay, packet received, and packet sent with a variation of nodes density and mobility. The results were obtained using the NS-2 simulator.

Vehicular cloud computing is envisioned to deliver services that provide traffic safety and effic... more Vehicular cloud computing is envisioned to deliver services that provide traffic safety and efficiency to vehicles. Vehicular cloud computing has great potential to change the contemporary vehicular communication paradigm. Explicitly, the underutilized resources of vehicles can be shared with other vehicles to manage traffic during congestion. These resources include but are not limited to storage, computing power, and Internet connectivity. This study reviews current traffic management systems to analyze the role and significance of vehicular cloud computing in road traffic management. First, an abstraction of the vehicular cloud infrastructure in an urban scenario is presented to explore the vehicular cloud computing process. A taxonomy of vehicular clouds that defines the cloud formation, integration types, and services is presented. A taxonomy of vehicular cloud services is also provided to explore the object types involved and their positions within the vehicular cloud. A comparison of the current state-of-the-art traffic management systems is performed in terms of parameters, such as vehicular ad hoc network infrastructure, Internet dependency, cloud management, scal-ability, traffic flow control, and emerging services. Potential future challenges and emerging technologies, such as the Internet of vehicles and its incorporation in traffic congestion control, are also discussed. Vehicular cloud computing is envisioned to have a substantial role in the development of smart traffic management solutions and in emerging Internet of vehicles.

Paper