Wireless Sensor Networks
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1 Wireless Sensor Networks Office Hours: Tuesday 3 5 Main Building, second floor Credits: 6
2 Ouline 1. WS(A)Ns Introduction 2. Applications 3. Energy Efficiency
3 Section 1 WS(A)Ns
4 Basics Wireless Sensor Network Definition A Wireless Sensor Network (WSN) in its simplest form can be defined as a network of (possibly low-size and low-complex) devices denoted as nodes that can sense the environment and communicate the information gathered from the monitored field through wireless links to a gateway, connected to other networks (e.g., Internet) I.F. Akyildiz, Su Weilian, Y. Sankarasubramaniam, E. Cayirci, "A survey on sensor networks," Communications Magazine, IEEE, vol.40, no.8, pp.102,114, Aug 2002
5 Basics Wireless Sensor Network Monitored Area other nets (e.g., Internet) gateway users Density / Number of Nodes? sensor node
6 Basics Wireless Sensor (hereafter denoted as node ) Sensor(s) A/D The sensor may measure: Energy controller Memory Temperature, Light, Acceleration, Humidity, Pollution, Magnetic fields, Seismic events, Electric current, The node RX/TX
7 Basics Wireless Sensor Nodes are devices low cost low complexity low size [low energy]
8 Basics Wireless Sensor Commercially Available Products (Samples) Compliant Clock Flash RAM Receive Sensitivity RF Power Min RF Power Max Cost Country YES 40 MHz 128K 96K -96 dbm -30 dbm +4 dbm $ 150 USA
9 Basics Wireless Sensor Commercially Available Products (Samples) Compliant Clock Flash RAM Receive Sensitivity RF Power Min RF Power Max Cost Country YES 40 MHz 256 K 8 K -97 dbm dbm $100 USA
10 Basics Wireless Sensor Commercially Available Products (Samples) Compliant Clock Flash RAM Receive Sensitivity RF Power Min RF Power Max Cost Country YES 8 MHz 48K 10K -94 dbm -24 dbm 0 dbm $ 134 USA
11 Basics transmitter receiver source TX RX sink Transmit Power transmitting antenna system receiving antenna system Received Power Power Loss (db) = Transmit Power (dbm) Received Power (dbm) GSM: Max Loss WSNs: Max Loss Max Loss (db) = Tr. Power (dbm) Rec. Sens. (dbm) Distance (m)
12 Basics Wireless Sensor Network With Single Sink other nets (e.g., Internet) users gateway sink node
13 Basics Wireless Sensor Network With Multiple Sinks other nets (e.g., Internet) gateway sink users Density / Number of Sinks? node
14 Basics Wireless Sensor Network With Actuators other nets (e.g., Internet) users gateway sink node actuator
15 Basics Wireless Sensor Network With Heterogeneous Nodes other nets (e.g., Internet) users gateway sink node actuator
16 Basics Wireless Sensor Network With Heterogeneous Nodes A network of nodes that cooperatively sense the environment and may control it, enabling interaction between People (the users) and the Environment. other nets (e.g., Internet) users gateway sink node actuator
17 Basics Wireless Sensor Network With Multiple Gateways other nets (e.g., Internet) users sink / gateway node actuator
18 Basics Wireless Sensor Network With Mobile Gateways other nets (e.g., Internet) users sink / gateway node actuator
19 Basics Wireless Sensor Network With Mobile Gateways Carried by People Moving in the Environment Network Opportunism other nets (e.g., Internet) users sink / gateway node actuator
20 Basics Wireless Sensor Network With Mobile Nodes Vehicular Sensor Networks other nets (e.g., Internet) users sink / gateway node actuator
21 Basics Wireless Sensor Network With Mobile Nodes And Mobile Gateways Vehicular Sensor Networks other nets (e.g., Internet) users sink / gateway node actuator
22 Basics Nodes are low cost low complexity low size [low energy] Short Transmission Ranges WSNs are (possibly) large unplanned self-organising Multi-Hop Transmission Very Complex Unpredictable Topologies
23 Basics What is a Wireless Sensor Network? Wireless sensors (hereafter, nodes) are deployed in a given area, or volume (generically denoted as monitored space). They are connected through a self-organised wireless network. Nodes can either be aware of their location or not. In many cases, they are stationary. Nevertheless, applications with mobile sensors are becoming increasingly interesting. In many cases each node is equipped with a battery that normally is not replaced during network lifetime: energy efficiency is a primary issue in these cases. The network can be homogeneous (if all nodes have equal characteristics) or heterogeneous. One or more monitoring stations (denoted as sinks) are located inside or outside the monitored space and collect the information.
24 All nodes can behave like receive-and-forward devices (multi-hop routing is used); however, nodes can perform distributed and/or collaborative signal processing in order to reduce the amount of information to be transmitted. Scalability (with respect to network size, or monitored space size) is a fundamental characteristic. The sinks then transmit the result of their monitoring to external entities by means of a separate network (through a gateway). Sink(s) can trigger nodes. Alternatively, nodes autonomously transmit the data they sense (i.e. the report) periodically or when an event is detected. When nodes are triggered, they can be selectively addressed (i.e. the sensed space is generally a subset of the monitored space). According to node density and transmission range, the network can be fully connected or not. Coverage of the sensor network depends on the sensing range of nodes. Coverage and connectivity are closely related features and very relevant aspects.
25 Basics Wireless Sensor Network Why? Number of scientific publications First releases of commercial products based on standards Proprietary solutions available Releases of commercial products based on stable standards today Large-scale networks deployment years
26 Basics Wireless Sensor Network Why?
27 Basics Wireless Sensor Network
28 Summing-Up Self- Everything (Organisation, Maintenance, Healing, ) No centralised control No planning Comm. Protocols No need for human control Energy Efficiency Network Lifetime can be the primary performance metric Comm. Protocols & HW Scalability All protocols must work whatever the size of the network Comm. Protocols Connectivity and Coverage The information must be detected and forwarded to sinks Network Topology Other aspects: Security, Reliability
29 Summing-Up Self- Everything Comm. Protocols Energy Efficiency Comm. Protocols Scalability Comm. Protocols Connectivity and Coverage Topologies Other aspects: Security, Reliability Syllabus 1.Applications 2.PHY Protocols 3.MAC Protocols 4.NET Protocols 5.Energy Efficiency 6.Time Synchronization 7.Localization 8.Case Studies
30 Section 2 Applications Examples Taxonomy Requirement Types
31 Protocols Stack Energy Efficiency Application Layer Network Layer Localization MAC Layer Time Synchronization PHY Layer
32 Applications: Examples Environmental monitoring Healthcare Mood based services Positioning and tracking Entertainment Logistics Transportation Home and office Industrial
33 Applications: Examples Environmental monitoring Healthcare Mood based services Human Positioning and tracking Entertainment Logistics Machine Transportation Home and office Industrial
34 Applications: Examples
35 Applications: Connected Home & Business
36 Applications: Connected Energy
37 Applications: Connected Cities
38 Applications: Connected Health
39 Applications: Taxonomy Type of Reporting Event Detection Event Triggered Reporting or Estimation of Spatial (and Temporal) Random Processes Loose Periodic Reporting
40 Applications: Taxonomy Type of Reporting Event Detection Req.s on delay or Estimation of Spatial (and Temporal) Random Processes Req.s on data losses
41 Applications: Taxonomy Event Detection The density of nodes must ensure: - The event is detected with given probability; coverage, related to sensing range of nodes and event type distributed localisation algorithms - The report can be received by the sink(s) with given probability; connectivity, related to transmission range of nodes communication protocols The sampling frequency must ensure: - The event is detected with given probability; responsiveness, related to event type - The report timely reaches the sink(s) communication protocols Both the density of nodes and sampling frequency are application-dependent.
42 Applications: Taxonomy Estimation of Random Processes (optional) TRIGGER Packets from sink(s) T R Round time Reports from nodes
43 Applications: Taxonomy Estimation of Random Processes The density of nodes must ensure: - The process is accurately estimated; data processing, related to process type - The samples can be received by the sink(s) with given probability; connectivity, related to transmission range of nodes communication protocols The sampling frequency must ensure: - The process evolution is tracked; responsiveness, related to process type light x Both the density of nodes and sampling frequency are application-dependent. x
44 Applications: Taxonomy Estimation of Random Processes The density of nodes must ensure: - The process is accurately estimated; data processing, related to process type - The samples can be received by the sink(s) with given probability; connectivity, related to transmission range of nodes communication protocols The sampling frequency must ensure: - The process evolution is tracked; responsiveness, related to process type light T R t Both the density of nodes and sampling frequency are application-dependent.
45 Applications: Requirement Types Event Detection Probability of false alarm Probability of missed detection Localisation precision Latency Network lifetime < < < m < s > months - years Estimation of Random Processes Sampling frequency Network lifetime see later > months - years The different types of requirements make protocols very application-dependent.
46 Applications: Requirement Types - Examples Requirements for sampling frequency ( round interval) Magnetometers 25 Hz bandwidth High bandwidth optical magnetometers 10 khz bandwidth Accelerometers samples at 48 KHz Some applications (e.g pollution control) require few samples per day T R might range from 10-5 to seconds. Very different values of the round interval, depending on specific application.
47 Summing-Up Very wide ranges of node densities, sampling frequencies, QoS requirements, make the design of wireless sensor networks extremely application-dependent. As a consequence, all protocols must be very flexible and adaptive to the different user requirements.
48 Summing-Up Syllabus 1.Applications Event Detection Estimation of Random Processes 2.PHY Protocols 3.MAC Protocols 4.NET Protocols 5.Energy Efficiency Smart city Smart body Smart buildings 6.Time Synchronization 7.Localization 8.Case Studies
49 Section 3 Energy Efficiency Where is the energy spent? When is the energy spent? Activity factor
50 Protocols Stack Energy Efficiency Localiz. Application Layer Network Layer MAC Layer Time Synchronization PHY Layer
51 Tr R St C Acc Li ansmit eceive Sleep 5 MHz 1 MHz andby ompass L E D elerometer ght Wireless Sensor Networks Energy Efficiency: Where is the Energy Spent? Power consumption [mw] Transceiver Processor LED Sensors
52 Energy Efficiency: Where is the Energy Spent? Radio dominates energy consumption Listening as expensive as transmitting
53 Energy Efficiency: Example CHIPCON CC2420 Radio supply voltage = 2.5V Power = I*V = 1 mw 43.5 mw = mw mw - 25 db - 3 db
54 Energy Efficiency: Example Freescale MC1322 Radio supply voltage = 3.6 V Power = I*V State Reception Transmission Idle (MCU active, radio off) Idle (MCU idle, radio off) Hybernate Current draw 22 ma 29 ma 3.3 ma 0.8 ma 0.85 μa
55 Energy Efficiency: When is the Energy Spent? D S T I T R = D + S + T + I Round duration RX sensing TX idle E = P rec D + P sens S + P trasm T [ + P idle I ] Joule/round time This model is not complete! Dynamic effects are neglected: - relaxation effect - energy dissipation during transients
56 Energy Efficiency: When is the Energy Spent? During transmission [Joule/bit] Typical values: During reception / sensing When idle (transceiver off) When sleeping 1 (normalised) Joule/bit
57 Energy Efficiency All phases of the communication protocol must be designed to minimise energy consumption Circuitry must be designed to minimise energy consumption Nodes must turn off during inactive periods of time
58 Energy Efficiency round 1) The sink sends the TRIGGER packet 2) Sensors send the data measured 3) All sensors move to sleep state after T on seconds 4) Sensors periodically wake up to sense the channel till a new TRIGGER packet is sent by the sink T on T R..... T on ON SLEEP ON SLEEP ON SLEEP ON t SENSOR DATA TRIGGER TRANSMISSION PACKET TRANSMISSION TRIGGER PACKET TRANSMISSION
59 Energy Efficiency: Activity Factor..... ON SLEEP ON SLEEP ON SLEEP ON AF on = T on / (T on +T sleep ) E charge = 5000 J = P sleep T sleep + P on T on = P on T on = T on T on = 10 5 s = approximatively one day! If requested node lifetime is one year, AF on must be 1/365 < 1 %
60 Summing-Up Reception is as energy consuming as transmission is (avoid overhearing!). Sensing can be also very energy consuming (be careful with CSMA!).
61 Wireless Sensor Networks
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