Priya Ranjan

Ant-based adaptive message forwarding scheme for challenged networks with sparse connectivity

We propose a new class of message routing schemes for mobile wireless networks with intermittent network connectivity. The proposed schemes are based on swarm intelligence (SI) and exploit the statistical properties of time-varying network connectivity for opportunistic message forwarding. We also consider a special form of our proposed schemes which can be viewed as a marriage between the SI and the backpressure algorithm and investigate its stability. We demonstrate that there is a fundamental trade-off between the adaptation rate and the stability region of the proposed scheme.

Global stability conditions for rate control with arbitrary communication delays

We analyze the optimization framework for the rate allocation problem proposed by Kelly and investigate the stability of the system with arbitrary fixed communication delays between network elements. We show that there is an underlying discrete time system arising from a natural market structure. The stability of this market equilibrium is directly related to the stability of the rate control system. We first present general stability conditions of the system with arbitrary delays, and then apply these results to establish the stability of the system with a family of popular utility and resource price functions of interest to us.

Nonlinear instabilities of D2TCP-II

In the era of heavy-duty transmission control protocols (TCP), adapted for extremely hi-bandwidth datacenters; the fundamental question of stable interaction with either proposed/customized active queue management(AQM) or popularly discussed Random Early Detection (RED) remains a hotly debated issue. While there are claims of “oscillation” only dynamical behavior, there are equally large number of claims which demonstrate the chaotic nature of different flavors of TCP and their AQM interaction. In this work, we provide a sound and analytical mathematical model of DTCP/D2TCP and study their interaction with threshold based packet marking policy. Our work shows that for a simple scenario this interaction is chaotic in nature and has large variability in dynamical behavior over orders of magnitude changes in parameter range as demonstrated by bifurcation diagrams. We conclude with numerical simulation evidence that chaotic behavior of protocols is inherent in their design which they inherit from their early vanilla TCP days, and it has serious implications for data-center throughput, load batching and collapse in Incast kind of scenario.

Towards a new low cost, simple implementation using embedded system wireless networking for UAVs

This work focuses on the development of relatively simple, low cost, autonomous and feasible wireless sensor network and related embedded system combination to be integrated with AMATEUR UAV and unmanned ground vehicle (UGV) management system both at inter and intra level communication and networking for different modules and different vehicles. What we describe here is our progress in a ongoing live project. We also make fresh implementable proposals to integrate autonomous Amateur UAV and share plans to implement it for vehicle management system using intelligent communication and networked system approach. We envision the capability of modern sensing network where communication between different sensors and embedded system combination enable user to have a closer view over larger area and provide potent capability of acting autonomously.

Towards Greener & Safer Mines with Wireless Sensor Networks

Miniaturized sensors and networking are technical proven concepts. Both the technologies are proven and various components e.g., sensors, controls, etc. are commercially available. Technology scene in above areas presents enormous possibilities for developing innovative applications for real life situations. Mining operations in many countries have lot of scope for improving environmental and safety measures. Efforts have been made to develop a system to efficiently monitor a particular environment by deploying a wireless sensor network using commercially available components. Wireless Sensor Network has been integrated with telecom network through a gateway using a suitable topology which can be selected at the application layer. The developed system demonstrates a way to connect wireless sensor network to external network which enables the distant administrator to access real time data and act expediently from long-distance to improve the environmental situation or prevent a disaster. Potentially, it can be used to avoid the awful situations leading to terrible environment in underground mines.

EMEEDP: Enhanced Multi-hop Energy Efficient Distributed Protocol for Heterogeneous Wireless Sensor Network

In WSN (Wireless Sensor Network) every sensor node sensed the data and transmits it to the CH (Cluster head) or BS (Base Station). Sensors are randomly deployed in unreachable areas, where battery replacement or battery charge is not possible. For this reason, Energy conservation is the important design goal while developing a routing and distributed protocol to increase the lifetime of WSN. In this paper, an enhanced energy efficient distributed protocol for heterogeneous WSN has been reported. Proposed paper considers energy heterogeneous WSN to increase the lifetime of the network. An algorithm is proposed in the form of flow chart and based on various clustering equation proved that the proposed work accomplishes longer lifetime with improved QOS parameters. A WSN implemented and tested using Raspberry Pi devices as a base station, temperature sensors as a node and xively.com as a cloud. Users use data for decision purpose or business purposes from xively.com using internet.