SmartCars and SmartRoads: Applying technology of Wireless Sensor Networks to public transportation.
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1 SmartCars and SmartRoads: Applying technology of Wireless Sensor Networks to public transportation. Thesis Proposal By Ricardo Joseph Estevez As part of the requirements for the degree of Master of Science in Computer Science University of Colorado at Colorado Springs Committee Members and Signatures: Approved by Date Advisor: Dr. Edward Chow Committee member: Dr. Terrance Boult Committee member: Dr. Sudhanshu K. Semwal Ricardo Estevez 9/21/06 Page 1 of 9
2 1 Introduction Human beings live in a world of advancing computing technology. Just as computers have entered every nook-and-cranny of our homes and workplace, so has the network. Today, a computer without a network is similar to a car without a road. We can drive around and use the functions provided in our car but without the road, how would we connect? Similarly without the network, our computers would be isolated and the dissemination of information limited. Overcoming this island of computing has led to the continuous linkage of computers to networks and the network s ubiquitous integration into our daily lives. The most famous network, which is actually a collection of interconnected networks [15] or internetwork, is the Internet. The Internet, which is the backbone of the most popular distributed system known as the World Wide Web, has closed the geographic gap among people and businesses. It serves as a medium for researching, entertainment, business transactions, and communication [14]. A computer network provides a computational need with a large number of separate but interconnected computers [21]. To be interconnected means to be able to exchange information over some connection such as copper wire, fiber optics, microwave, infrared, and communication satellites. The observation is that the connection medium is both wired and wireless. A specialized networking technology known as wireless sensor networks (WSN) is providing researchers with remote monitoring capabilities [1]. The application area of wireless sensor networks is virtually the world around us. Wireless sensors can monitor the environment and gather measurements such as temperature, light, and seismic readings. These sensing devices, called motes, can self-organize to form a wireless network enabling the transmission of their measurements to a central processing unit for aggregation, analysis, and decision-making. For example, WSN have been used to perform habitat monitoring at Great Duck Island in Maine [8]. In another example, implementing WSN allows first responders to perform risk analysis on a building structure and to track personnel once deployed into a distressed building [9][10]. The domain of public transportation can benefit from wireless sensor networks. This is a popular topic in the automotive industry. For the government, the data acquired from the wireless sensor networks could pinpoint hazards in the road related to road decay or weather conditions. For insurance companies, the data could be used to determine the cause of an accident. And for the consumer, automobile manufacturers could use the data to create safety or convenience systems. In this research, the focus is the consumer. This thesis provides analysis, simulation, and feasibility of algorithms for passive and active safety systems that are built upon an architecture that is founded heavily on the application of wireless sensor networks to automobiles and the roads they travel. Ricardo Estevez 9/21/06 Page 2 of 9
3 The rest of this paper is organized as follows. Section 2 formally states the details of the thesis. Section 3 provides background information of wireless sensor information including its constraints, hardware, and software architecture. Section 4 examines the application of wireless sensor networks to public transportation. This examination is important because it will be shown that there is a lack of focus in the area of safety systems for the consumer. Section 5 presents a high-level object-oriented design to identify actors, objects, and system boundaries. Section 6 outlines the thesis project plan and schedule. Section 7 lists the thesis project deliverables. Section 8 cites the references. 2 Thesis The technology of wireless sensor networks can be integrated into automobiles and roadways to provide the following safety systems: 1. Forward-looking traffic detection algorithm. 2. Emergency braking alert with tailgating awareness algorithm. 2.1 Thesis Objectives Identify the safety systems that can be created when wireless sensor networks enter the automobile and roadways. Identify algorithms that will use data provided by the wireless sensor network in order to make decisions that are used in the safety systems. Investigate existing hardware platforms provided by wireless sensor technology vendors such as Crossbow for compatibility with the safety systems presented in this paper [11][12][13]. Investigate how to best deploy motes such that the radio signal obstruction, propagation, and attenuation factors are addressed. Investigate the safety system s performance and scalability in varying bandwidth, which directly affects the transportation of data. Increased data flow in high traffic situations could possibly hinder bandwidth and thus the propagation of data. Identify networking algorithms to ensure the dissemination of current traffic data. Packets will likely need a priority and maturity algorithm. 2.2 Proof-of-Concept and Simulation The TinyOS, or TOSSIM, simulator will be used to test the mote system programming, deployment strategies, and safety-decision algorithms. Empirical data on traffic patterns will be incorporated as well. 3 Wireless Sensor Networks Ricardo Estevez 9/21/06 Page 3 of 9
4 A wireless sensor network is composed of the sensing devices called motes. Motes will receive and send data to a base station for aggregation so that observations and decisions can be made. Characteristics of a wireless sensor networks include the ability to make autonomous actions based on environmental observations. Motes need to be selforganizing, self-regulated, self-repairing, and programmable. The mote technology is somewhat constrained in order to provide a low-cost, reusable deployment into varying environments. For example, a mote has limitations on physical memory, computation power, bandwidth, and energy. Another constraint is size. Some motes only the size of a coin will be able to be deployed into an environment by the millions thus creating a digital skin with each sensor capable of capturing physical information about its immediate space. [7] The raw data can then be aggregated to provide data points that can be analyzed to derive a meaningful observation. 4 Public Transportation Public transportation is a domain area that many researchers are examining for the fullscale integration with wireless sensor networks. Here we examine the existing studies at research laboratories and academic institutions. One researcher, Teresa Lunt, who is the manager of the Palo Alto Research Center s computer science lab envisions a sensor network where cars can communicate with one another on the highway the Transportation Department has been interested in reducing the number of accidents by putting sensor on vehicles that could pre-deploy your airbag [or] a merge assistant that could tell you if someone s in your blind spot or around the corner, or if you re driving over the road. All these things could be enabled through sensors. [1] The CarTel project [3] at the Massachusetts Institute of Technology believes that with hundreds of millions of vehicles on the road and over a billion people using cellular phones, cars and humans may turn out to be the carriers of the world s largest and most dynamic sensor networks in the coming years. This project has designed and deployed a mobile distributed sensor computing system. The system has a three-tier architecture, thus creating a layer for the database, business logic, and client. Conceptually, the system works as follows: the client layer presents a thin-client portal where asynchronous queries can be sent to the mobile sensor nodes deployed on a vehicle. The network on which these queries travel is designed to be delay-tolerant since the sensor nodes create the mobile network. When the query reaches the mobile sensor node, it provides the query along with the parameters, such as response priority, so the data collected can travel back through the network with assigned priority and destination. Finally, the data returns and is inserted into a relational database where another client application can view statistics visually with map data. As innovative as the CarTel project is, it still lacks the investigation of safety systems that will benefit the automotive industry. Instead, the project focused usage for their system is traffic monitoring and route planning; preventive maintenance; road condition monitoring; or a proxy monitoring service for other wireless networks. Ricardo Estevez 9/21/06 Page 4 of 9
5 This thesis builds on the ideas similar to the studies at Palo Alto and MIT. Note that these areas of research have focused on efforts similar to environmental monitoring. However, this thesis focuses exclusively on the application of the wireless sensor networks and provides innovative algorithms to create new safety systems for the driver and cars. In Japan, Honda is already testing the integration of advanced safety systems into cars and roads [16]. Their prototype safety system features the capability to allow a car to send and receive signals from other cars and the road. Such signals could warn of road hazards; a red-light runner at a traffic light intersection; school zone warnings; and traffic data. The research conducted in this thesis has led to the creation of several algorithms and architecture to provide passive and active systems that will enable automobiles and drivers with traffic data. The concepts in this study are different than similar studies because of the following constraints: Build a non-proprietary system. Build an affordable system using inexpensive but reliable computing devices. Build a system that is wireless sensor network centric. Build a system that can leverage existing technologies such as GPS. In order to formally analyze the problem domain of public transportation, object-oriented analysis will be used to identify and define the objects and data. 5 High-level system design The safety systems presented in this study depends on the SmartCar and SmartRoad subsystems. SmartCar an automobile that has the capability to interpret traffic data aggregated by the WSN to make life-saving safety decisions such as accident detection and accident avoidance. A SmartCar will also be a source of data for other SmartCars to interpret. SmartRoad a city street, state highway, or national interstate that has motes deployed at mile markers, lane striping, and other static road artifacts. Both subsystems will employ a packet-relaying algorithm that will degrade old traffic data and promote for removal so that network will contain current traffic data. The figure shown below is a visual description of the high level design. Conceptually, the SmartCars will communicate to each other over the wireless sensor network passing data that will allow another SmartCar to make a decision supporting the on-board active and/or passive safety systems. The SmartRoads will relay data downstream. Ricardo Estevez 9/21/06 Page 5 of 9
6 6 Thesis Plan & Schedule Spring Semester 2006 Figure 1 - High Level System Design Objective: Completed or In Progress: Notes: Narrow thesis topic. Completed. Thesis is to focus study on the application of wireless sensor networks to public transportation. Begin preliminary research on similar work that exists Completed. See cited references. in academic community. Identify a rough draft of questions that can be solved during your thesis study. Completed. The early questions need to be evaluated for feasibility. Specifically, can computer science and a scientific method be used to answer these questions? Deliver an informal thesis Completed. Dr. Chow received my Ricardo Estevez 9/21/06 Page 6 of 9
7 proposal to graduate advisor, Dr. Edward Chow. thesis proposal at the end of the Spring semester. He provided feedback which has guided my continued research. Fall Semester 2006 Objective: Completed or In progress: Notes: Continue to research the mote hardware technology available through vendors such as Crossbow. In progress. MSP-SYS410CA is a wireless detection system that can be used for traffic pattern analysis and Construct your scientific method. Specifically, how will you test your algorithms? Complete research, simulation, and thesis report. 7 Deliverables In progress. In progress. vehicle tracking. Simulate using the TinyOS and the TinyOS Simulator (TOSSIM). These are the deliverables for the successful completion of the graduate work. At the end of the Fall Semester 2006, I will successfully complete my thesis research and deliver the following artifacts to my graduate committee: 1. Thesis report. 2. A simulator that demonstrates the concepts and algorithms of the smart car/road system. Ricardo Estevez 9/21/06 Page 7 of 9
8 8 References 1. A. Ricadela. The Emerging World Of Wireless Sensor Networks Information Week, January 20, Wireless Ad Hoc Sensor Networks. Advanced Network Technologies Division, National Institute of Standards and Technologies. 3. H. Balakrishnan, S. Madden, V. Bychkovsky, K. Chen, W. Daher, M. Goraczko, H. Hu, B. Hull, A. Miu, E. Shih. CarTel: A Mobile Sensor Computing System. Massachusetts Institute of Technology, Cambridge, Massachusetts, USA. 4. Energy Efficient Sensor Networks (EYES). Telecommunications Networks Group, Technical University of Berlin, Germany. 5. Wireless Senor Networks: a Fragmented Market with Great Potential &display=RFID. MoreRFID.com, April 14, OMNeT++ Discrete Event Simulation System G. Smit, P Havinga. Collaborative Sensor Networks. Department of Computer Science, University of Twente, Netherlands. 8. A. Mainwaring, J. Polastre, R Szewczyk, D. Culler, J. Anderson. Wireless Sensor Networks for Habitat Monitoring. In WSNA 02, Atlanta, Georgia, USA, September D. M. Doolin, N. Sitar. Wireless sensors for wildfire monitoring. Civil and Environmental Engineering, University of California, Berkeley, CA, USA. 10. C. E. Chow, G. Godavari. First Responders Sensor Network. Department of Computer Science, University of Colorado at Colorado Springs, Colorado Springs, CO, USA, Fall Crossbow MoteWorks Platform. Crossbow Technology Inc. 12. MSP410 Wireless Security System Specification Sheet. Document Part Number: Rev B. Crossbow Technology Inc. Ricardo Estevez 9/21/06 Page 8 of 9
9 13. MSP-SYS MSP Mote Developer s System Specification Sheet. Document Part Number: Rev A. Crossbow Technology Inc. 14. B. Leiner, V. G. Cerf, D. D. Clark, R. E. Kahn, L. Kleinrock, D. C. Lynch, J. Postel, L. G. Roberts, S. S. Wolff. The past and future history of the Internet. In Communications of the ACM, February A. Tanenbaum. Computer Networks. Prentice Hall PTR, Upper Saddle River, New Jersey 07458, C. Woodyard. Cars soon may talk to roads, each other. USA Today, November Ricardo Estevez 9/21/06 Page 9 of 9
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