![1. Traditional layered
approach cannot share
different information
among different layers
， which leads to each
layer not having
complete information.
The traditional layered
approach cannot
guarantee the
optimization of the entire
network.
2. The traditional layered
approach does not have
the ability to adapt to the
environmental change.
3. Because of the
interference between the
different users, access
conflicts, fading, and the
change of environment
in the wireless sensor
networks, traditional
layered approach for
wired networks is not
applicable to wireless
networks.
So the cross-layer can be used to
make the optimal modulation to
improve the transmission
performance, such as data rate,
energy efficiency, QoS (Quality
of Service), etc.. Sensor nodes
can be imagined as small
computers which are extremely
basic in terms of their interfaces
and their components.
They usually consist of a
processing unit with limited
computational power and
limited memory, sensors or
MEMS (including specific
conditioning circuitry), a
communication device (usually
radio transceivers or
alternatively optical), and a
power source usually in the
form of a battery. Other possible
inclusions are energy harvesting
modules,[10]
secondary ASICs,
and possibly secondary
communication interface (e.g.
RS-232 or USB).
The base stations are one
or more components of the
WSN with much more
computational, energy and
communication resources. They
act as a gateway between sensor
nodes and the end user as they
typically forward data from the
WSN on to a server. Other
special components in routing
based networks are routers,](https://image.slidesharecdn.com/e1ce3aa3-2a88-4f06-8b9c-6ced39bdca09-160920041749/85/wireless-sensor-network-ieee-7-320.jpg)
wireless sensor network ieee
- 1. wireless sensor network Shanmugapriya Arumugam Final Year MCA Student Dept. of Computer Science P.K.R Arts College for Women, Gobi. E-mail: shanmupkr@gmail.com Ms.J.Kokilavani Assistant professor Dept. of MCA Vivekanandha institute of information and management studies Tiruchengode E-mail:vanijagan2k4@gmail.com Dr. S. Jayasankari Assistant Professor Dept. of Computer Science P.K.R Arts College for Women, gobi E-mail:jai.nivi.ravi@gmail.com INTRODUCTION A wireless sensor network (WSN) (sometimes called a wireless sensor and actor network (WSAN)) are spatially distributed autonomous sensors to monitor physical or environmental conditions, such as temperature, sound, pressure, etc. and to cooperatively pass their data through the network to a main location. The more modern networks are bi-directional, also enabling control of sensor activity. The development of wireless sensor networks was motivated by military applications such as battlefield surveillance; today such networks are used in many industrial and consumer applications, such as industrial process monitoring and control, machine health monitoring, and so on. The WSN is built of "nodes" – from a few to several hundreds or even thousands, where each node is connected to one (or sometimes several) sensors. Each such sensor network node has typically several parts: a radio transceiver with an internal antenna or connection to an external antenna, a microcontroller, an electronic
- 2. circuit for interfacing with the sensors and an energy source, usually a battery or an embedded form of energy harvesting. A sensor node might vary in size from that of a shoebox down to the size of a grain of dust, although functioning "motes" of genuine microscopic dimensions have yet to be created. The cost of sensor nodes is similarly variable, ranging from a few to hundreds of dollars, depending on the complexity of the individual sensor nodes. CONTENTS • APPLICATION o PROCESS MANAGEMEN T o AREA MONITORING o HEALTH CARE MONITORING o ENVIRONMEN TAL/EARTH SENSING FOREST FIRE DETECT ION LANDSL IDE DETECT ION WATER QUALIT Y MONITO RING NATUR AL DISASTE R PREVEN TION o INDUSTRIAL MONITORING MACHIN E
- 3. HEALTH MONITO RING DATA LOGGIN G WATER/ WASTE WATER MONITO RING STRUCT URAL HEALTH MONITO RING • CHARACTERISTICS • PLATFORMS o HARDWARE o SOFTWARE OPERAT ING SYSTEM S o ONLINE COLLABORATI VE SENSOR DATA MANAGEMEN T PLATFORMS • SIMULATION OF WSNS • OTHER CONCEPTS o DISTRIBUTED SENSOR NETWORK o DATA INTEGRATION AND SENSOR WEB o IN-NETWORK PROCESSING APPLICATION PROCESS MANAGEMENT it's not working for cables or wires only sensors in management AREA MONITORING Area monitoring is a common application of WSNs. In area monitoring, the WSN is deployed over a region where some phenomenon is to be monitored. A military example
- 4. is the use of sensors detect enemy intrusion; a civilian example is the geo-fencing of gas or oil pipelines. HEALTH CARE MONITORING The medical applications can be of two types: wearable and implanted. Wearable devices are used on the body surface of a human or just at close proximity of the user. The implantable medical devices are those that are inserted inside human body. There are many other applications too e.g. body position measurement and location of the person, overall monitoring of ill patients in hospitals and at homes. Body- area networks can collect information about an individual's health, fitness, and energy expenditure. ENVIRONMENTAL/EARTH SENSING There are many applications in monitoring environmental parameters, examples of which are given below. They share the extra challenges of harsh environments and reduced power supply. AIR POLLUTION MONITORING Wireless sensor networks have been deployed in several cities (Stockholm, London and Brisbane to monitor the concentration of dangerous gases for citizens. These can take advantage of the ad hoc wireless links rather than wired installations, which also make them more mobile for testing readings in different areas. FOREST FIRE DETECTION A network of Sensor Nodes can be installed in a forest to detect when a fire has started. The nodes can be equipped with sensors to measure temperature, humidity and gases which are produced by fire in the trees or vegetation. The early detection is crucial for a successful action of the firefighters; thanks to Wireless Sensor Networks, the fire brigade will be able to know
- 5. when a fire is started and how it is spreading. LANDSLIDE DETECTION A landslide detection system makes use of a wireless sensor network to detect the slight movements of soil and changes in various parameters that may occur before or during a landslide. Through the data gathered it may be possible to know the occurrence of landslides long before it actually happens. WATER QUALITY MONITORING Water quality monitoring involves analyzing water properties in dams, rivers, lakes & oceans, as well as underground water reserves. The use of many wireless distributed sensors enables the creation of a more accurate map of the water status, and allows the permanent deployment of monitoring stations in locations of difficult access, without the need of manual data retrieval. NATURAL DISASTER PREVENTION Wireless sensor networks can effectively act to prevent the consequences of natural disasters, like floods. Wireless nodes have successfully been deployed in rivers where changes of the water levels have to be monitored in real time. INDUSTRIAL MONITORING MACHINE HEALTH MONITORING Wireless sensor networks have been developed for machinery condition-based maintenance (CBM) as they offer significant cost savings and enable new functionality. Wireless sensors can be placed in locations difficult or impossible to reach with a wired system, such as rotating machinery and untethered vehicles. DATA LOGGING Wireless sensor networks are also used for the collection of
- 6. data for monitoring of environmental information, this can be as simple as the monitoring of the temperature in a fridge to the level of water in overflow tanks in nuclear power plants. The statistical information can then be used to show how systems have been working. The advantage of WSNs over conventional loggers is the "live" data feed that is possible. WATER/WASTE WATER MONITORING Monitoring the quality and level of water includes many activities such as checking the quality of underground or surface water and ensuring a country’s water infrastructure for the benefit of both human and animal.It may be used to protect the wastage of water. STRUCTURAL HEALTH MONITORING Wireless sensor networks can be used to monitor the condition of civil infrastructure and related geo-physical processes close to real time, and over long periods through data logging, using appropriately interfaced sensors. CHARACTERISTICS The main characteristics of a WSN include: • Power consumption constraints for nodes using batteries or energy harvesting • Ability to cope with node failures (resilience) • Mobility of nodes • Heterogeneity of nodes • Scalability to large scale of deployment • Ability to withstand harsh environmental conditions • Ease of use • Cross-layer design Cross-layer is becoming an important studying area for wireless communications. In addition, the traditional layered approach presents three main problems:
- 7. 1. Traditional layered approach cannot share different information among different layers ， which leads to each layer not having complete information. The traditional layered approach cannot guarantee the optimization of the entire network. 2. The traditional layered approach does not have the ability to adapt to the environmental change. 3. Because of the interference between the different users, access conflicts, fading, and the change of environment in the wireless sensor networks, traditional layered approach for wired networks is not applicable to wireless networks. So the cross-layer can be used to make the optimal modulation to improve the transmission performance, such as data rate, energy efficiency, QoS (Quality of Service), etc.. Sensor nodes can be imagined as small computers which are extremely basic in terms of their interfaces and their components. They usually consist of a processing unit with limited computational power and limited memory, sensors or MEMS (including specific conditioning circuitry), a communication device (usually radio transceivers or alternatively optical), and a power source usually in the form of a battery. Other possible inclusions are energy harvesting modules,[10] secondary ASICs, and possibly secondary communication interface (e.g. RS-232 or USB). The base stations are one or more components of the WSN with much more computational, energy and communication resources. They act as a gateway between sensor nodes and the end user as they typically forward data from the WSN on to a server. Other special components in routing based networks are routers,
- 8. designed to compute, calculate and distribute the routing tables. PLATFORMS HARDWARE One major challenge in a WSN is to produce low cost and tiny sensor nodes. There are an increasing number of small companies producing WSN hardware and the commercial situation can be compared to home computing in the 1970s. Many of the nodes are still in the research and development stage, particularly their software. Also inherent to sensor network adoption is the use of very low power methods for radio communication and data acquisition. In many applications, a WSN communicates with a Local Area Network or Wide Area Network through a gateway. The Gateway acts as a bridge between the WSN and the other network. This enables data to be stored and processed by devices with more resources, for example, in a remotely located server. SOFTWARE Energy is the scarcest resource of WSN nodes, and it determines the lifetime of WSNs. WSNs may be deployed in large numbers in various environments, including remote and hostile regions, where ad hoc communications are a key component. For this reason, algorithms and protocols need to address the following issues: • Increased lifespan • Robustness and fault tolerance • Self-configuration Lifetime maximization: Energy/Power Consumption of the sensing device should be minimized and sensor nodes should be energy efficient since their limited energy resource determines their lifetime. To conserve power, wireless sensor nodes normally power off both the radio transmitter and the radio receiver when not in use. OPERATING SYSTEMS
- 9. Operating systems for wireless sensor network nodes are typically less complex than general-purpose operating systems. They more strongly resemble embedded systems, for two reasons. First, wireless sensor networks are typically deployed with a particular application in mind, rather than as a general platform. Second, a need for low costs and low power leads most wireless sensor nodes to have low-power microcontrollers ensuring that mechanisms such as virtual memory are either unnecessary or too expensive to implement. When an external event occurs, such as an incoming data packet or a sensor reading, TinyOS signals the appropriate event handler to handle the event. Event handlers can post tasks that are scheduled by the TinyOS kernel some time later. LiteOS is a newly developed OS for wireless sensor networks, which provides UNIX-like abstraction and support for the C programming language. Contiki is an OS which uses a simpler programming style in C while providing advances such as 6LoWPAN and Protothreads. ONLINE COLLABORATIVE SENSOR DATA MANAGEMENT PLATFORMS Online collaborative sensor data management platforms are on- line database services that allow sensor owners to register and connect their devices to feed data into an online database for storage and also allow developers to connect to the database and build their own applications based on that data. Examples include Xively and the Wikisensing platform. Such platforms simplify online collaboration between users over diverse data sets ranging from energy and environment data to that collected from transport services. Other services include allowing developers to embed real-time graphs & widgets in websites; analyse and process historical data pulled from the data feeds;
- 10. send real-time alerts from any datastream to control scripts, devices and environments. The architecture of the Wikisensing system describes the key components of such systems to include APIs and interfaces for online collaborators, a middleware containing the business logic needed for the sensor data management and processing and a storage model suitable for the efficient storage and retrieval of large volumes of data. SIMULATION OF WSNS At present, agent-based modeling and simulation is the only paradigm which allows the simulation of complex behavior in the environments of wireless sensors (such as flocking). Agent-based simulation of wireless sensor and ad hoc networks is a relatively new paradigm. Agent-based modelling was originally based on social simulation. Network simulators like OPNET, NetSim and NS2 can be used to simulate a wireless sensor network. OTHER CONCEPTS DISTRIBUTED SENSOR NETWORK If a centralised architecture is used in a sensor network and the central node fails, then the entire network will collapse, however the reliability of the sensor network can be increased by using a distributed control architecture. Distributed control is used in WSNs for the following reasons: 1. Sensor nodes are prone to failure, 2. For better collection of data, 3. To provide nodes with backup in case of failure of the central node. There is also no centralised body to allocate the resources and they have to be self organized. DATA INTEGRATION AND SENSOR WEB
- 11. The data gathered from wireless sensor networks is usually saved in the form of numerical data in a central base station. Additionally, the Open Geospatial Consortium (OGC) is specifying standards for interoperability interfaces and metadata encodings that enable real time integration of heterogeneous sensor webs into the Internet, allowing any individual to monitor or control Wireless Sensor Networks through a Web Browser. IN-NETWORK PROCESSING To reduce communication costs some algorithms remove or reduce nodes' redundant sensor information and avoid forwarding data that is of no use. As nodes can inspect the data they forward, they can measure averages or directionality for example of readings from other nodes. For example, in sensing and monitoring applications, it is generally the case that neighboring sensor nodes monitoring an environmental feature typically register similar values. This kind of data redundancy due to the spatial correlation between sensor observations inspires techniques for in- network data aggregation and mining