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Distributed Network Protocol (DNP 3.0) is a reliable and an efficient open standard SCADA communication protocol predominantly used in the Energy Sector in USA. Due to its exhaustive specification and complex implementation it becomes essential to perform vulnerability analysis. The paper highlights attack surface specific to function codes present in Data Link and Application layer of the protocol...
In IPv6 Over Low Power Wireless Personal Area Networks (6L0WPAN) the network reliability, availability and lifespan depends on the energy consumed by the wireless sensor motes as well as the network as a whole. In order to improve the aforementioned parameters the energy consumption must be kept at minimum. The mote and network level energy consumption is evaluated, analyzed for real and emulated...
Machine to Machine (M2M) communication is about devices connected to each other, communicating with each other and accessible by different users simultaneously. Since many devices are interconnected, there arises concern pertaining to security of data access and control access of devices. This access cannot be given to an unauthorized person, hence security measures are important in M2M. Centre for...
Radio frequency fingerprinting, based on Wi-Fi signals is a popular approach for indoor localization. Recently a few works have explored applicability of machine learning techniques to this problem. However, the challenging task of accurately finding the position depends on prior efforts of fingerprinting. Another challenge is that, distance sensitivity of signal strength depends on proximity to the...
Offloading or cyber foraging is a technique to overcome resource constraints of mobile devices by migrating heavy computation to remote more resourceful surrogates (such as PDAs, desktop PCs). Many research works have been done so far on the architecture of offloading systems, what to offload (partitioning of offloadable code) and when to offload (based on energy constraint, execution time). However,...
Mobile devices play a vital role for handling emergency situations. During emergency, it is very difficult to collect necessary information from the mobile devices if there is unavailability of networks. In this work, an Energy Efficient Emergency Management System named as E3M has been proposed. E3M supports peer-to-peer communication between mobile devices if a mobile device does not find any suitable...
Vehicular ad-hoc networks (VANETs) play a vital role in enabling intelligent transport services (ITS). The state of art dedicated short range communication (DSRC), which is envisioned to facilitate the communication in VANETs, requires dedicated hardware. This hinders the penetration of ITS especially in developing countries. This paper studies the suitability of Wi-Fi Direct (WD), which is readily...
In this paper, we investigate resource optimization for energy-efficient data transmissions in a multi-cell massive multiple-input multiple-output (MIMO) system with zero-forcing (ZF) detectors. We optimize the number of active antennas per BS so as to maximize the energy efficiency (EE) of uplink data transmissions. To model the bit-per-joule EE objective, we consider throughput rate and power expenditure...
Data collection is very basic application of Wireless Sensor Networks. Sensor nodes are deployed in region to be observed. They sense quantity of interest. It may be temperature, pressure, humidity, solar radiation and so on. The sensed readings are transferred to a central node known as sink or base station. Often networks are heterogeneous in nature i.e. more than one types of sensors are deployed...
A number of governmental and non-governmental bodies are visiting the rural parts of India on a regular basis to provide quality health care facilities. But due to the remoteness of the areas, the follow up of patients has become a major challenge. In this work we propose an Internet of things based patient health monitoring system as a solution to afore mentioned problem. The system monitors vital...
Flexible spectrum ROADMs facilitate networks to support channels operating at heterogeneous line rates by allocating spectral resources in a dynamic and flexible manner leading to better Spectral Efficiency. In a realistic network, traffic scenario is very dynamic in nature leading to continuous tear down of existing demands and set up of new demands. This dynamic tear down and set up process leads...
A vehicular delay tolerant network (VDTN) is a special type of delay tolerant network (DTN), in which vehicles act as mobile nodes that are carriers of the message. It is characterized by the absence of an end-to-end connectivity between the nodes residing at the extreme ends. The routing in VDTN is critical as nodes are not connected permanently and the goal is to complete the message delivery successfully...
In this article, we have proposed a novel rectangular microstrip slot antenna with frequency reconfigurable characteristics for wireless applications. With the aid of two switches the reconfigurable characteristic of antenna is achieved thus enabling it to work in multiple modes. By making these switches ON and OFF, the antenna's frequency of operation can be varied. The antenna has a single band...
Recent Data center network topologies put forward multiple paths between the end hosts to provide high bisection bandwidth. For the sake of efficient utilization of multiple paths many load balancing techniques are proposed in the literature. These load balancing proposals mainly deal with distribution of traffic among multiple paths. While balancing the traffic among multiple paths, few proposals...
In this paper, a method of improving data rate in avionics systems is proposed which incorporates OFDM transmission technology for high data rate communication. An FPGA-based hardware test bed is developed which uses OFDM physical layer over MIL-STD-1553B communication in RF wireless systems. Finally, a prototype test system is developed using three nodes to emulate Wireless Avionics Intra-Communications...
A novel design and analysis of circular microstrip antenna loaded with a key-shaped slot is presented. The introduction of key-shaped slot in the microstrip patch excites the additional modes which are orthogonal to each other, thus demonstrating multi-band dual polarized antenna characteristics. Also the next higher order modes manifest the broadband antenna response. For the optimization of the...
We investigate the planning of virtual optical bus (VOB) networks-as a packet-oriented all-optical solution for transport networks-under changing traffic conditions. The planning of a VOB network consists of grouping all edge-to-edge flows in the network into clusters called VOBs, and that has to be done with the objective of minimizing packet collision rate in the optical network. With the dynamic...
In this paper, we study path selection criteria in cluster-based multi-hop cooperative networks with decode-and-forward relays over Rayleigh fading channels. The hop-by-hop path selection criterion, in which routing is done based on local channel state information, loses diversity gain due to lack of relay selection in the last hop. To overcome this issue, we study an improved path selection strategy,...
Queue management in Named Data Networks (NDN) has gained a lot of attention recently. Unlike the traditional IP architecture, the transport mechanism in NDN is intricate and comprises of in-network caching of data packets at routers. Hence, the most effective avoidance of congestion can occur at the routers itself. In this paper, we make two contributions: first, we propose a back pressure based congestion...
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