Developing a Component-based Simulator for Wireless Sensor Network

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A Project for the course "Technologies of Information Systems"

A Project for the course "Technologies of Information Systems"

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  • 1. Developing a Component-based Component- Simulator for Wireless Sensor Network Project for the course: Technologies of Information System Under the supervision of: Prof. Fabio A. Schreiber Students: Adnan Faisal (709399) Lucky Meherunnesa (709400) Sk. Md. Munir Hassan(709529) Sk Md M i H (709529) Date: 28 01 08 D t 28-01-08
  • 2. Flow of the presentation 2 •Introduction •The Simulator Architecture The •The Design Document •Future works uue o s •Application demonstration Corbetta Simone – Giuseppe Landolfi
  • 3. 3 Introduction I t d ti Corbetta Simone – Giuseppe Landolfi
  • 4. Introduction 4 •In this project we intended to develop a WSN simulator focusing on component based architecture in which every component has input and output interface through which a component can take input or give output to the outside world. •We take a step to develop a wireless sensor network simulator as the improved version of the previously developed simulators which would pave the way for the wide acceptance and deployment of se so e o s sensor networks. •This simulator has been developed in such a way so that it can support or work with different kinds of wireless nodes. •Another additional feature of our simulator is that it can take the definition of a wireless node as a system parameter at runtime, as a result the simulator is not restricted to a single type of node. Corbetta Simone – Giuseppe Landolfi
  • 5. WSN and its Simulator 5 •Wireless Sensor Networks (WSNs) consist of small nodes with sensing, computation, and wireless communications capabilities. •Networking together hundreds or thousands of cheap micro sensor nodes allow users to accurately monitor a remote environment by intelligently combining the data from the individual nodes. •Sensor networks can be used for various app ca o a eas (e g , health, military, home). Se so e o s ca o a ous application areas (e.g., ea , a y, o e) •The challenge of developing, debugging, and evaluating complex sensor network applications demand a new set of tools to aid programmers. Simulators have been developed to fulfill these demands and have been the subject of intense research in the p j past decade. Corbetta Simone – Giuseppe Landolfi
  • 6. The need of another WSN Simulator 6 •By studying some simulation of sensor networks developed in the previous researches such as TOSSIM, ATEMU and AVRORA we have found a few deficiencies. •TOSSIM provides a high degree of accuracy but its compilation loses fine grained timing. Also, TOSSIM can simulate only TinyOS programs. •ATEMU was the first a d, u U as e s and, until now, o y instruction-level s u a o that cou d s u a e se so network o , only s uc o e e simulator a could simulate sensor e o programs with accuracy down to the clock cycle of each individual node. The cycle-by-cycle implementation strategy achieves synchronization for free but scales poorly. •AVRORA outperforms ATEMU in terms of raw p p performance when run on a state-of-the-art Java virtual machine, scales to more nodes, and scales well over number of processors available to the simulator. One limitation of AVRORA is that it does not model clock drift, a phenomenon where nodes may run at slightly different clock frequencies over time due to manufacturing tolerances, temperature, and battery p performance. Corbetta Simone – Giuseppe Landolfi
  • 7. 7 The Si l t Th Simulator Architecture Corbetta Simone – Giuseppe Landolfi
  • 8. Simulator Top View 8 SIMULATOR MODEL Environment WORLD Aggregation APPLICATION  SIMULATOR NODE •World: Describes the world of the sensors. Tells where is water, tree etc. A sensor node may query the world for different information such as temperature, sound, vibration, pressure, motion or pollutants, at different locations. •Application Simulator: The application simulator is the place where the queries are processed. •Node: Node refers to a y se so node. We have de e oped our s u a o in suc a way so that it ca ode ode e e s o any sensor ode e a e developed ou simulator such ay a can support or work with different kinds of wireless nodes. Corbetta Simone – Giuseppe Landolfi
  • 9. The Meta Model 9 n COMPONENT EXECUTE INTERFACES STATELESS STATEFUL INPUT OUTPUT •A component based model. •A component can be either stateless (e.g., query executor) or stateful (e.g., battery). •One component (for example, node) can be composed of one or more other components (for example, radio component, battery model component etc.) Corbetta Simone – Giuseppe Landolfi
  • 10. Node Architecture 10 •The node is composed of several SOFTWARE NODE components. •The components of a node are - APPLICATION  Radio, Network communication, SOFTWARE Application software, Sensor Board, Software and battery model. •The radio model has the responsibility to communicate with NETWORK  the components which are both COMMUNICATION BATTERY MODEL internal and external to the node. •The network model knows the physical position of each of the nodes Input present in the system RADIO •The incoming queries (for example, Output SENSOR BOARD the current temperature in the node) are processed in the application software model. •The battery model mainly deals with the power consumption and NETWORK  WORLD  power state of the node. MODEL MODEL •The sensor board senses temperature etc. from the outside world. Corbetta Simone – Giuseppe Landolfi
  • 11. Base station – Node Relationship 11 Base Station Node n Node 1 ... Node 2 Node 3 •A base station is a node which has more processing power and battery power than all other nodes. •All the nodes in a sensor network are assigned to exactly one base station to which all other nodes are connected directly. •Any query at first comes to the base station. Any •The base station dispatches the query to the nodes. •The results of the queries from the nodes are sent back to the base station. q Corbetta Simone – Giuseppe Landolfi
  • 12. Query decomposer – Node Relationship 12 QUERY  NODE DECOMPOSER QUERY AGGREGATOR RADIO  Query  MODEL Manager SENSOR  NETWORK MODEL BOARD POWER  CONSUMPTION  CONSUMPTION (STATEFUL) WORLD  DEPLOY MODEL •At first a query comes to the Query Decomposer. The query decomposer receives an aggregated query like “Get the average temperature of all the nodes . Get nodes”. •This aggregated query has to be decomposed and sent to each of the nodes of the network. The query decomposer gets the topology of the network from the Network Model. •Then the query decomposer sends the decomposed query to each of the nodes •The results of the query from each of the node are sent back to the Aggregator. •The aggregator aggregates all the results of the decomposed queries and provides the final result of the aggregated query. Corbetta Simone – Giuseppe Landolfi
  • 13. Network as a series of components 13 Node2 Node1 Node3 Node5 World Node4 •All nodes might not be directly connected to each other (this may be due the range limitation of a node), but all the nodes must be connected to the world model. •The world model is connected with the Network model. Therefore, if a node is required to know information about the physical position of other nodes, it can get the information from the world model as well. Corbetta Simone – Giuseppe Landolfi
  • 14. Addressing and routing of nodes 14 •If a node falls in the covering region of other node, they will be considered as connected. NODE SENSOR •In the simpler version, this version connection will be of no use but in the later versions, where a routing APPLICATION algorithm for the nodes is to be implemented, implemented these inter- inter RADIO connections of the nodes will become useful. •The nodes are connected to NODE NODE each other using the radio model. SENSOR SENSOR This is quite obvious, as we consider the radio model as the interface for both input and output APPLICATION APPLICATION of a node. RADIO RADIO WORLD Corbetta Simone – Giuseppe Landolfi
  • 15. Node creation at run time 15 Base Station Parametric node RADIO RADIO FACTORY •The factory component can create nodes (parametric nodes) at run time. •This information of creating a node is immediately sent to the base station. •This is because, the base station has to be connected with this newly created node with the help of the radio component as soon as possible. Corbetta Simone – Giuseppe Landolfi
  • 16. 16 Design Di Document Corbetta Simone – Giuseppe Landolfi
  • 17. Design Document 17 •The classes of our wireless sensor network simulator can be divided into two major packages. •The first package contains the classes related to the Node Model. The •The second package contains the classes related to the Application Simulator. •The application s u a o uses the node model to c ea e nodes a d s u a es the world o the se so s e app ca o simulator e ode ode o create odes and simulates e o d of e sensors. Corbetta Simone – Giuseppe Landolfi
  • 18. Classes of the Node Model 18 Corbetta Simone – Giuseppe Landolfi
  • 19. Class relationships for the Node 19 Model •When two classes interact with each other, other they do not interact with each other directly. •We introduce another set of classes (in fact, they are java interfaces, not complete classes). classes) •These association classes/interfaces are introduced to make the relationship and communication among the classes more flexible. flexible Corbetta Simone – Giuseppe Landolfi
  • 20. The factory class 20 •The factory class has the responsibility to create nodes at run time. •Initial version of the simulator will contain only one type of node, which does not necessarily require the Factory class. But, later versions will need the factory classes to create nodes of different types at runtime. Corbetta Simone – Giuseppe Landolfi
  • 21. Sequence diagram – setting the 21 temperature of a node p Corbetta Simone – Giuseppe Landolfi
  • 22. Sequence diagram – getting the 22 temperature of a node p Corbetta Simone – Giuseppe Landolfi
  • 23. Sequence diagram – setting the 23 charge of a node g Corbetta Simone – Giuseppe Landolfi
  • 24. Sequence diagram – getting the 24 charge of a node g Corbetta Simone – Giuseppe Landolfi
  • 25. The Application Architecture – 25 High level view Corbetta Simone – Giuseppe Landolfi
  • 26. The Application Architecture – 26 High level view •Model description builder: Can take a model as input and then builds the initial model. This model should contain the description of the nodes to be made. •Simulator description: Contains the built- model of the sensor network classes which has been created by the MDB. •Management: This component will be used to manage the application. (e.g., to start/stop simulation etc.) •Simulation performer: The simulation performer performs every step of the simulator – processing input and sending to the output interface. To process the input, it must interact with the Simulator Description. Corbetta Simone – Giuseppe Landolfi
  • 27. The Application Architecture – 27 Class level view Corbetta Simone – Giuseppe Landolfi
  • 28. The Application Architecture – 28 The implemented Class level view Corbetta Simone – Giuseppe Landolfi
  • 29. Control flow of the simulator 29 Corbetta Simone – Giuseppe Landolfi
  • 30. Future works 30 •The current version implements only one kind of nodes. It can be extended to different kinds of nodes. •The current implementation does not make use of the world model. The world model here we use is a dummy world model. •A new battery model may be considered to take into account the real battery's discharge behavior. In real life, when a battery stands idle after a discharge, certain chemical and physical changes take place which can result in voltage recovery. •Other models that we might plan to have as part of our future work include better sensor channel models such as seismic models for generating ground vibrations, fire models, lighting and temperature models and mobility models. Corbetta Simone – Giuseppe Landolfi
  • 31. 31 Thank you! Corbetta Simone – Giuseppe Landolfi