BITS Faculty Publications

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Subject: search.filters.subject.Mobile Wireless Sensor Network

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    BSwarm robot — A low cost mobile wireless sensor research platform using COTS products
    (IEEE, 2015) Shenoy, Meetha V.
    MWSN is an emerging area of research and most of the work in the field of MWSN is done at the simulation level as there is hardly any cost effective hardware platform(node/mote) available for MWSN applications. To handle mobility, the MWSN node should be much more efficient than the nodes in static WSN. Moreover, a MWSN node should be capable of handling real time mobility control, path planning and navigation. The application domains of MWSN can be further expanded by incorporating swarm like intelligence in MWSN. We have developed a low cost, small form factor hardware platform which will function as a node in MWSN using custom off the shelf(COTS) products. Our mobile hardware platform, henceforth called as BSwarm robot supports self-assembly, to achieve complex tasks. The platform also support image assisted navigation and provides extensive I/O support for further feature expansion. The testbed consisting of multiple BSwarm robot can be utilized for the development and validation of algorithms/protocols related to MWSNs, distributed control of Swarm robots, real time image processing etc. BSwarm robot is a multi processor based robot designed in such a way that it can be used for applications which may demand varied degree of processing, communication and input-output capabilities. This paper also highlights major factors that can be taken into consideration while choosing the hardware platform for MWSNs so that the protocol stack development for MWSNs becomes easier.
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    Swarm-Sync: A distributed global time synchronization framework for swarm robotic systems
    (Elsevier, 2018-02) Shenoy, Meetha V.
    Time synchronization is a crucial service task in a distributed network. Although several works are reported in routing and medium access control of mobile wireless sensor networks (MWSNs), or for navigation in a collaborative swarm of robots, prior time synchronization is stated as one of the prior requirement. In this paper, we study the problem of time synchronization over a wireless network for a swarm robotic system. We propose a fully decentralized, energy efficient framework for global synchronization of swarm of robots. The major contribution of this work is in terms of proposing a scalable, topology independent, mobility-assisted time synchronization framework with resynchronization interval in the order of several minutes (tested up to 10 min) which we believe will accelerate development of swarm robotic systems and mobile wireless sensor networks for several human-friendly real-world applications. The proposed framework which implements time synchronization in two phases, (1) One-way time offset compensation and (2) Relative skew fingerprinting based frequency offset compensation, is flexible and can be tuned easily to suit several application scenarios. Another unique characteristic of the framework is that it utilizes only one-way messages for the time offset and frequency offset compensation. We also demonstrate that the protocol scales very well for multi-hop scenarios and that bounded synchronization error across the network can be achieved using the framework. Analysis on the suitability of our framework for dynamic environments is also presented. We also present a fair comparative analysis of our work with the predictive protocols based on techniques such as Linear regression, Linear prediction and Kalman filter and consensus based synchronization proposed for static networks. The results and analysis presented here are derived from the analytical and empirical study on mobile nodes/robots spread over a duration of 5 months.
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    2.5G MOBILE NETWORKS: GPRS and EDGE
    (McGraw Hill, 2008) Narang, Nishit
    his book culminates the trilogy of books written by Sumit Kasera and Nishit Narang on three key wireless technologies "2G. 2.5G and 3G Mobile Networks. Even though 2G and 2.5G technologies, as compared to 3G, are more than a decade old, the current corporate battle for 2G spectrum in India, indicates the significance and growth potential of these technologies including GSM and GPRS. 2.5G Mobile Networks is a complete coverage of GPRS and EDGE concepts presented in simple non-technical language without complex mathematics. An ideal primer for those working in or studying networking technologies, this book focuses mainly on procedures and basis of signaling exchanges. Readers will find a detailed treatment on GPRS network architecture, a healthy mix of concepts and protocols of Air Interface and Core Network, discussion on GPRS user-plane aspects with focus on user-plane protocols, important aspects of EDGE and much more. This book will be a valuable guide to both engineers as well as students working on GPRS and EDGE. It will also be a great follow up for those will knowledge on GSM and want to know more on the intermediate technologies before studying 3G UMTS.
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    DS-MMAC: dynamic schedule based MAC for mobile wireless sensor network
    (ACM Digital Library, 2016-04) Gudino, Lucy J.
    In this paper, we propose a medium access protocol for Mobile Wireless Sensor Network which uses dynamic scheduling of time slot for channel access. We have considered a mixed deployment of both mobile and static wireless sensor nodes. The static nodes, which act as cluster head, maintain a local schedule to service the mobile neighbors and also route data to the base station. The design goals of our MAC are energy efficiency, increased packet delivery and low control overhead. The request-reply mechanism for data transfer, used in our approach, plays a vital role in the handover process. Simulation results indicate that our approach performs better in terms of data rate, energy efficiency and control overhead when compared with Hybrid MAC protocol. Testbed results indicate that the proposed approach can be effectively used in WSN where topology change is frequent.
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    Energy Efficient Mobile MAC Protocol with Mobility Vector for Neighbor Selection in Wireless Sensor Networks
    (Praise Worthy Prize, 2016) Gudino, Lucy J.
    Scenarios where the sensors are mobile, introduce a new set of issues to be addressed in the design of their protocol stack. The layers that get affected the most are the Medium Access Control(MAC) and the network layer. This paper presents a multichannel mobile MAC protocol with Mobility Vector for neighbour discovery. Static nodes in the network use sleep wake pattern to conserve energy. The mobility vector information such as direction and speed, along with the nodes residual energy are used to select a neighbour that can provide maximum connection retention time. Mobility vector information is also used to wake those neighbours that are in the trajectory of the mobile node movement. The proposed multichannel protocol guarantees an interference-free communication. The proposed approach is simulated and compared against other similar MAC protocols, in terms of data-rate, control overhead and energy. Experimental results indicate that the multi-channel MAC gives better results when compared to single channel MAC protocols. Implementation of the proposed approach is tested using Berkley motes and by using custom designed mobile node.