harmonization of Internet of Things (IoT) devices and systems. This standard defines a method for data sharing, interoperability, and security of messages over a network, where sensors, actuators, and other devices can interoperate, regardless of underlying communication technology.
Model Call Girl in Tilak Nagar Delhi reach out to us at 🔝9953056974🔝
IOT technology-standards
1. EES 510: Internet of Things
IoT Technology Standards
Assoc. Prof. Dr. Asrulnizam Abd Manaf
Collaborative Microelectronic Design Excellence Center (CEDEC)
2. We l e a d
A Plethora of Keywords
http://thumbs.dreamstime.com/z/internet-things-word-cloud-words-which-related-to-concept-iot-refers-to-uniquely-38616417.jpg
2
3. We l e a d
Learning Objectives
• To explain the relationships among various
technology domains within the IoT space
• To identify common spectrum allocations and
modulation schemes for IoT
• To identify various standard bodies in the IoT
space
3
http://knowledgehub.cef-see.org/wp-content/uploads/2015/02/LearningObjectives.png
4. We l e a d
IoT Mind Map
4
Cyber Physical Systems (CPS)
Internet of Things (IoT)
Wireless Sensor
Networks (WSN)
Machine to Machine
Communications
(M2M)
Radio Frequency
Identifier (RFID)
Internet
Enabled
Appliances
Passive
RFID
Active
RFID
IoT
Gateways
5. We l e a d
Related Concepts in IoT
• Internet Enabled Appliances
• Machine to Machine Communications (M2M)
• Radio Frequency Identifier (RFID)
• Wireless Sensor Networks (WSN)
• Internet of Things (IoT)
• Cyber Physical Systems (CPS)
5
Cyber Physical Systems (CPS)
Internet of Things (IoT)
Wireless Sensor
Networks (WSN)
Machine to Machine
Communications
(M2M)
Radio Frequency
Identifier (RFID)
Internet
Enabled
Appliances
Passive
RFID
Active
RFID
IoT
Gateways
6. We l e a d
Precursors to IoT
• Early connected devices
– Wired Home and Building Automation (X10,
LonWorks)
– Industrial Automation (Fieldbus/ Controller Area
Network (CAN bus), Industrial Ethernet)
– Supervisory Control and Data Acquisition (SCADA)
• Wireless standards evolved from these use
cases
6
Cyber Physical Systems (CPS)
Internet of Things (IoT)
Wireless Sensor
Networks (WSN)
Machine to Machine
Communications
(M2M)
Radio Frequency
Identifier (RFID)
Internet
Enabled
Appliances
Passive
RFID
Active
RFID
IoT
Gateways
7. We l e a d
Continuum of IoT
• Basically IoT are devices that are connected to
the Internet (Ubiquitous computing)
– TCP/IP based vs. proprietary/specialized protocols
– Gateways used to interface between TCP/IP and
legacy or specialized IoT domains
• TCP/IP is not efficient for low bit rate IoT networks
• Wired or Wireless
– Trend is for wireless due to ease of deployment,
mobility, coverage, remote target areas
7
Cyber Physical Systems (CPS)
Internet of Things (IoT)
Wireless Sensor
Networks (WSN)
Machine to Machine
Communications
(M2M)
Radio Frequency
Identifier (RFID)
Internet
Enabled
Appliances
Passive
RFID
Active
RFID
IoT
Gateways
8. We l e a d
Internet Enabled Appliances
• Evolution of Consumer Household Devices
– e. g. Smart TV, Smart Fridge, Home Security/
Monitoring, Smart Thermostat, Smart Lighting
• Typically Wi-Fi or Ethernet based
• Attempt to enhance usage experience
• Typically accessible via Apps on Smartphones
• Focus on user interaction
• Not main driver of R&D in IoT Space
8
Cyber Physical Systems (CPS)
Internet of Things (IoT)
Wireless Sensor
Networks (WSN)
Machine to Machine
Communications
(M2M)
Radio Frequency
Identifier (RFID)
Internet
Enabled
Appliances
Passive
RFID
Active
RFID
IoT
Gateways
9. We l e a d
Machine to Machine (M2M) Communications
Targeted Applications
• Industrial Automation and
SCADA
• Infrastructure monitoring
(e.g., smart grids / utilities)
• Remote sensing (e.g.,
weather stations)
• Smart Cities: traffic, water,
agriculture, waste
management
Usage Profile
• Low data rates (< 50 kbps)
• Short, reliable messages
• Real-time response
• Wired (Local plants)
• Wireless (Long Range)
– Two-way radios (TETRA)
– Cellular (EC-GSM)
• Evolution towards CIoT/
LPWAN
– LTE/5G (LTE-M)
– Sigfox/ LoRa
9
Cyber Physical Systems (CPS)
Internet of Things (IoT)
Wireless Sensor
Networks (WSN)
Machine to Machine
Communications
(M2M)
Radio Frequency
Identifier (RFID)
Internet
Enabled
Appliances
Passive
RFID
Active
RFID
IoT
Gateways
10. We l e a d
Radio Frequency IDentifiers (RFID)
Targeted Applications
• Inventory Management and
Resource Tracking
– Replacement for Barcodes
• Retail
– Security and Restocking
• Supply Chain Tracking
– Parts / Inventory Movement
– Shipment Logging
• Public Transportation
– Fare cards
Usage Profile
• Passive RFID (EPC Gen 2)
– Near Field Communications
(NFC)
– Tags need Reader to activate
– Very low data rate (< 5 kbps)
– Returns Unique sequence
– Low Cost / No power
– Limited range (1 cm to 10 m)
– Tags are not IoT (though RFID
Readers may be networked)
10
Cyber Physical Systems (CPS)
Internet of Things (IoT)
Wireless Sensor
Networks (WSN)
Machine to Machine
Communications
(M2M)
Radio Frequency
Identifier (RFID)
Internet
Enabled
Appliances
Passive
RFID
Active
RFID
IoT
Gateways
11. We l e a d
Radio Frequency IDentifiers (RFID)
Targeted Applications
• Logistics
– Vehicle/ Consignment
tracking
• Automated Toll collection
• Transponders vs. Beacons
– Query/ Event driven vs.
Periodic broadcasts
Usage Profile
• Active RFID
– Low data rate (< 10 kbps)
– Can initiate updates/ alerts
– Battery Operated (weeks to
months)
– Longer range (100 m)
– Tags and Readers can share
hardware platform
– Not typically Internet enabled
– Overlaps with Wireless
Sensor Network (WSN)
Devices
11
Cyber Physical Systems (CPS)
Internet of Things (IoT)
Wireless Sensor
Networks (WSN)
Machine to Machine
Communications
(M2M)
Radio Frequency
Identifier (RFID)
Internet
Enabled
Appliances
Passive
RFID
Active
RFID
IoT
Gateways
12. We l e a d
Wireless Sensor Networks (WSN)
Targeted Applications
• Smart Agriculture
• Environment Sensing
Usage Profile
• Low to moderate data rates
– (1 kbps to 100 kbps)
• Data aggregation from
several data sources
• Medium range (20 – 200 m)
• Battery operated (weeks to
months)
• Static / random placements
12
Cyber Physical Systems (CPS)
Internet of Things (IoT)
Wireless Sensor
Networks (WSN)
Machine to Machine
Communications
(M2M)
Radio Frequency
Identifier (RFID)
Internet
Enabled
Appliances
Passive
RFID
Active
RFID
IoT
Gateways
13. We l e a d
Internet of Things (IoT)
Targeted Applications
• Healthcare, Personal Fitness
Tracking
• Surveillance and Security
• Evolution of SCADA devices
Usage Profile
• Typically wireless devices
– Combine features of Active
RFID and WSN with Internet
accessibility
• Low to High data rates
(10 kbps to 1 Mbps)
• PAN, LAN or WAN usage
• Typically Battery operated
• Typically has on-device
HTTP-based services
13
Cyber Physical Systems (CPS)
Internet of Things (IoT)
Wireless Sensor
Networks (WSN)
Machine to Machine
Communications
(M2M)
Radio Frequency
Identifier (RFID)
Internet
Enabled
Appliances
Passive
RFID
Active
RFID
IoT
Gateways
14. We l e a d
Cyber Physical Systems (CPS)
Targeted Applications
• Smart Cities Services
– Smart Transportation
– Smart utilities
• Manufacturing process
control
• Automated automotive and
flight controls
Usage Profile
• Larger in scope than IoT
• Focus on monitoring and
control of physical
objects/systems
– Mechatronics + cybernetics
– Tight integration/feedback
– Computer controlled
Sensor/Actuators
• May incorporate IoT
systems as elements
14
“Tight conjoining of and coordination between computational and physical resources”
– NSF USA
Cyber Physical Systems (CPS)
Internet of Things (IoT)
Wireless Sensor
Networks (WSN)
Machine to Machine
Communications
(M2M)
Radio Frequency
Identifier (RFID)
Internet
Enabled
Appliances
Passive
RFID
Active
RFID
IoT
Gateways
15. We l e a d
IoT Spectrum Usage (802.15.4)
15
• Only common 802.15.4 Standard Spectrum shown
• More than 22 different PHY definitions exist
• Some share spectrum but uses different modulation (not interoperable)
• 2.45 GHz ISM Band is most interoperable (worldwide coverage, 250 kbps)
• Specific PHY needed for specific country/region/industries
• E.g., Smart Utilities need to conform to 802.15.4g (WiSUN) standard
• There is no single standard PHY that can be used across the board
• Application specific platforms with specific PHY requirements (regulatory,
domain specific, energy consumption)
• Need for Gateways to interconnect with Internet
868 MHz (EU), 915 [902-928] MHz (NA)
1 channel, 10 channels
ISM Band: 2.450 [2.4 – 2.4835] GHz (Worldwide)
16 channels
780 [779-787] MHz (China)
4 channels
950 [950-956]MHz (Japan)
10/12 channels
54, , 862 MHz (NA)
Variable channels
433 MHz
1 channel
ISM Band: 2.450 GHz (Worldwide)
27 narrowband channels
3 – 10 GHz
Ultra Wide Band (UWB)
< 1 GHz
Ultra Wide Band (UWB)
802.15.4 (2006)
802.15.4a
802.15.4c
802.15.4d
802.15.4f (ActiveRFID)
802.15.4m (TV Whitespace)
2.45G
(W)
915
(NA)
868
(EU)
780
(CN)
950
(JP)
433
(W)
3 – 10 G
(Regional)
16. We l e a d
IoT Spectrum Usage (Bluetooth)
16
• Connection-oriented Star Topology (via device pairing)
• 7 slave devices to a master
• Allows for Scatternets (host/device in multiple PANs) but mechanics not clear
• Bluetooth is a mishmash of different technologies, often optional
• Bluetooth 1.x standardized as IEEE 802.15.1 (standard frozen)
• Bluetooth 3.x HS uses WiFi chipset to transfer data
• Bluetooth Low Energy (Wibree) shoehorned into Bluetooth 4.x
• Bluetooth 5.0 increase Throughput 2x, Range 4x
• Bluetooth capabilities are defined via Profiles
• Need correct profiles on Devices (slaves) and Host (master) to interoperate
• Bluetooth Low Energy (BLE) introduces connectionless communications (Beacons)
BR: FHSS 79 channels (1 Mbps GFSK @ 1 MHz) Bluetooth 1.x: BasicRate (BR)
Bluetooth 2.x + Enhanced Data Rate (EDR)
Bluetooth 3.x + EDR + High Speed (HS)
Bluetooth 4.x + EDR + HS
+ Low Energy (LE) (Dual Mode)
Bluetooth 5.0
ISM Band: 2.450 [2.402 – 2.480] GHz (Worldwide)
EDR: FHSS 79 channels (3 Mbps GFSK + xPSK @ 1 MHz)
EDR: FHSS 79 channels (3 Mbps GFSK + xPSK @ 1 MHz)
HS: 802.11 MAC/PHY (24 Mbps)
EDR: FHSS 79 channels (3 Mbps GFSK + xPSK @ 1 MHz)
HS: 802.11 MAC/PHY (24 Mbps)
LE: DHSS with AFH 40 Channels (1 Mbps GFSK @ 2MHz)
LE: DHSS with AFH 40 Channels (2 Mbps GFSK @ 2 MHz)
17. We l e a d
WiFi Spectrum Usage (802.11)
17
3-4 Non-overlapping Channels @ 22 MHz 802.11, 802.11b
802.11a
802.11g
802.11n
802.11ac
802.11p
ISM Band: 2.450 [2.400 – 2.475/2.500] GHz (Worldwide)
12-24 Non-overlapping Channels @ 20 Mhz
3-4 Non-overlapping Channels @ 20 MHz
7 Non-overlapping
Channels @ 10 MHz
UNII Bands 1,2,3: 5 [5.170 – 5.835] GHz (Regional)
ITS Band
(Licensed)
5.850 – 5.925 GHz
6-12 Non-overlapping Channels @ 40 Mhz
1-2 Non-overlapping Channels @ 40 MHz
3-6 Non-overlapping Channels @ 80 Mhz
1-2 Channels @ 160 MHz
(1) Non-overlapping Channels @ 80 MHz
• WiFi Standards are generally backwards compatible (support previous modes)
• ISM & Unlicensed National Information Infrastructure (UNII) Bands commonly used
• 2.4 GHz ISM Band is too crowded
• Channel allocations for 5 GHz is region specific
• High Bandwidths are achieved using Channel Bonding and MIMO
• Not suitable for battery-powered IoT devices due to high power usage
18. We l e a d
WiFi (802.11b) Channels
18
CC-BY-SA 3.0: Michael Gauthier, Wireless Networking in the Developing World
• Common spectrum worldwide covers Channels 1 – 11, Japan allow all 14 channels
• Only 3 non-interfering channels can co-exist in 2.4 GHz ISM Band (excluding Chan 14)
• Spectrum is shared with other users (Bluetooth, 802.15.4, proprietary RF standards)
• Direct Sequence Spread Spectrum (DSSS) based (802.11, 802.11b)
• Bluetooth-WiFi Coexistence defined in IEEE 802.15.2 standard
• Highest bandwidth per channel is 11 Mbps
• Multicast support in 2 Mbps mode
19. We l e a d
WiFi (802.11g/n) Channels @ 2.4 GHz
• Orthogonal Frequency
Division Multiplexing
(OFDM)
• 54 Mbps @ 20 MHz (11g)
• Channel bonding + MIMO
for higher bandwidths (11n)
• 150 Mbps @ 40 MHz
(2 adjacent bonded channels)
• 600 Mbps max @ 40 MHz
via 4 x MIMO (4 streams)
19
CC-BY 3.0: Liebeskind - Own work
Non-US (incl. JP) WiFi Spectrum Usage
20. We l e a d
Spectrum Zoo @ 2.4 GHz
20
http://www.ni.com/cms/images/devzone/pub/Page_10_Figure_2.PNG
21. We l e a d
WiFi (802.11 a/n/ac) Channels @ 5 GHz
• 20/40/80/160 MHz Channels (overlapping regional definitions)
– Japan has 10 MHz channels
– Expansion of UNII Band to add new channels
• 54 Mbps @ 20 MHz (11a/n) in 12-24 non-overlapping channels
• 433 Mbps @ 80 MHz (11ac) in 4-6 non-overlapping channels
• Channel bonding (up to 160 MHz, adjacent/non-adjacent + 8x
MIMO) for Multi-Gigabit speeds (11ac)
• Multi-User MIMO (MU-MIMO) to support simultaneous MIMO
stations (11ac)
21
http://y0.ifengimg.com/tech_spider/dci_2012/10/6994a4e043e1860c942767d997677309.jpg
22. We l e a d
Other 802.11 Spectrum Usage
• 802.11ad (up to 6.75 Gbps)
– Wireless Device Interlink applications (in-room)
– 60 GHz: Ultra Wide Band (2.16 GHz channels)
• 802.11af (up to 26.7/35.6 Mbps)
– Focused on long distance point-to-point links (1 km)
– TV White Space using Cognitive Radio (opportunistic networks)
• VHF/UHF: 54 MHz – 790 MHz (OFDM over 6/8 MHz channels)
• 802.11p (up to 27 Mbps)
– Wireless Access in Vehicular Environment (WAVE) applications
– Intelligent Transportation Systems (ITS) Band (Licensed)
• 5.9 GHz: 5.850 GHz – 5.925 GHz (10 MHz channels)
22
23. We l e a d
IoT Spectrum Usage for 802.11ah
23
902-928 MHz (US)
755-787 MHz (China)
916.5-927.5 MHz (Japan)
863-868 MHz (EU)
915
(US)
866
(EU)
771
(CN)
922
(JP)
917.5-923.5 MHz (Korea)
920
(KR)
866-869 MHz, 920-925 MHz (Singapore)
868
(SG)
923
(SG)
• Sub 1-GHz ISM Bands for IoT applications (2016)
• Support large number of nodes
• Longer range (up to 1 km)
• New Modulation / Coding Scheme for more robust transmission (@ 1 MHz)
• 1/2/4/8/16 MHz Channels
• Range of bit rates (150 kbps @ 1 MHz – 78 Mbps @ 16 MHz)
• OFDM-based (from 11ac), Sectorization/Multi-user MIMO to support more nodes
• Relay Access Points (RAP) to extend reach of Root AP
• Limited to 2-hops for bi-directional links
• Low Power (battery-based operation)
• Sleep scheduling using Target-Wake-Time (TWT)
24. We l e a d
IoT Spectrum Usage for Long Range
Sub 1 GHz Unlicensed/Cellular/LTE
24
• Focus on device-to-gateway (many-to-one) M2M traffic
• Long Range (LoRa): Sub 1GHz Unlicensed ISM bands
• 250 bps – 50 kbps
• Sigfox: Sub 1GHz Unlicensed ISM bands (proprietary technology)
• Very low bit rates (~100 bps), infrequent data transfers (< 140 12-byte messages/day)
• Extended Coverage GSM for IoT [EC-GSM-IoT]
• ~10 kbps using simpler control/data protocols over existing GSM infrastructure
• LTE for Machine-type Communications (LTE-M) / NB LTE-M [Cat-M1]
• LTE OFDM on low complexity transceivers (narrower bandwidths, Half-duplex)
• Cat 0/Cat.1.4MHz: 1 Mbps DL/UL, Cat.200kHz: 200 kbps DL/144 kbps UL
• Narrow band IoT (NB-IoT) [Cat-M2?]
• Less complex (Non-LTE based Uplink, OFDM Downlink)
• 200 kbps @ 180 kHz
GSM/LTE (Licensed) Bands: 700-900 MHz
(GSM standalone/LTE Guard Band/LTE In-band) 200 kHz ch.
GSM (Licensed) Bands: 800-900 MHz (Regional)
(EC-GSM-IoT Rel.13) 200 kHz channels
LoRa
Sigfox
EC-GSM-IoT
LTE-M
NB LTE-M
NB-IoT
700 – 900 MHz
915
(NA)
868
(EU)
433
(??)
868 MHz (EU)
8 (125/250 kHz) + 1UL + 1DL (125 kHz) ch.
915 [902-928] MHz (NA)
64 (125 kHz) / 8UL + 8DL (500 kHz) ch.
433 MHz
[TBD]
ISM Band: 868 MHz (EU), 902 Mhz (NA)
Ultra Narrow Band (Proprietary Technology)
LTE (Licensed) Bands: 700-900 MHz
(Rel.12-Cat.0) 20 MHz/(Rel.13-Cat-M1) 1.4 MHz ch.
LTE (Licensed) Bands: 700-900 MHz
(Rel.13-Cat-M1) 200 kHz channels
25. We l e a d
06/09/2017 (CC BY-NC-SA) 2016-17 Tat-Chee Wan, USM 25
Relevant Standard Bodies
Government-related
Non-government-related
Industry Based
26. We l e a d
06/09/2017 (CC BY-NC-SA) 2016-17 Tat-Chee Wan, USM 26
Assignment number 2:
• Please summarize on advantageous and disadvantegous on
each protocol. Summarize in table (slide 15-24)
• Make in point form
27. We l e a d
References
• http://www.impinj.com/resources/about-rfid/the-different-types-of-rfid-systems/
• N. Salman, I. Rasool and A. H. Kemp, “Overview of the IEEE 802.15.4 standards family for Low Rate Wireless Personal Area
Networks,” Wireless Communication Systems (ISWCS), 2010 7th International Symposium on, York, 2010, pp. 701-705.
http://dx.doi.org/10.1109/ISWCS.2010.5624516
• C. S. Sum, L. Lu, M. T. Zhou, F. Kojima and H. Harada, “Design considerations of IEEE 802.15.4m low-rate WPAN in TV white
space,” IEEE Communications Magazine, vol. 51, no. 4, pp. 74-82, April 2013.
http://dx.doi.org/10.1109/MCOM.2013.6495764
• Evgeny Khorov, Andrey Lyakhov, Alexander Krotov, Andrey Guschin, “A survey on IEEE 802.11ah: An enabling networking
technology for smart cities,” Computer Communications, Vol. 58, 1 March 2015, Pages 53-69, ISSN 0140-3664,
http://dx.doi.org/10.1016/j.comcom.2014.08.008.
• Zeeshan Hameed Mir, and Fethi Filali, “LTE and IEEE 802.11p for vehicular networking: a performance evaluation,” EURASIP
Journal on Wireless Communications and Networking, Vol. 2014, Pp. 1-15, ISSN 1687-1499, http://dx.doi.org/10.1186/1687-
1499-2014-89
• LoRa Alliance Technical Marketing Workgroup White Paper, “LoRaWAN: What is it?” Nov. 2015, https://www.lora-
alliance.org/portals/0/documents/whitepapers/LoRaWAN101.pdf
• https://www.ericsson.com/research-blog/internet-of-things/cellular-iot-alphabet-soup/
• Nokia Networks White Paper, LTE-M – Optimizing LTE for the Internet of Things, 2015.
http://networks.nokia.com/sites/default/files/document/nokia_lte-m_-
_optimizing_lte_for_the_internet_of_things_white_paper.pdf
• Sara Landstrom, Joakim Bergstrom, Erik Westerberg, David Hammarwall, “NB-IoT: A Sustainable Technology for Connecting
Billions of Devices,” Ericsson Technology Review, Vol. 93, No 3, Apr. 2016.
https://www.ericsson.com/res/thecompany/docs/publications/ericsson_review/2016/etr-narrowband-iot.pdf
27
Editor's Notes
Internet of Things is an aggregation of multiple domains that were previously proprietary, stand-alone (isolated), or difficult to exchange data. It is the interconnection of devices and systems using standardized protocols based on TCP/IP that forms the basis for the Internet of Things
The major related themes when talking about IoT is presented here.
Details will be provided in subsequent slides.
This is a Venn diagram of the relationships among the various domains which illustrate their relative importance and commonality / overlap among them.
For example:
Internet Enabled Appliances are a specific class of IoT devices.
Machine to Machine (M2M) communications exists both in proprietary implementations (outside of the IoT and CPS space), but forms a large part of the IoT and CPS communications process as well
Radio Frequency Identifier (RFID) consists of two types: passive and active. Passive RFID devices are not considered IoT devices as they do not have ‘intelligence,’ whereas Active RFID devices are generally considered a class of IoT devices.
Wireless Sensor Networks (WSN) devices were the direct ‘predecessor’ to what is known as IoT today. Nonetheless, WSN devices do not necessary operate using Internet Protocols, so they exist as a domain outside of IoT space as well. IoT Gateways can be used to interlink non-IP based WSN devices to the Internet.
WSN devices which support RFID protocols can also be considered a type of Active RFID.
There is a close relationship between IoT and Cyber Physical Systems (CPS), though CPS encompasses a larger scope as it includes monitoring and control of production machinery, utilities, and smart cities which are not often thought of as IoT devices, and many often have security requirements that prohibit them from being accessed over the Internet (though CPS devices may be part of a secured Intranet).
Enumerating the various domains that will be elaborated upon:
Internet Enabled Appliances
Machine to Machine Communications (M2M)
Radio Frequency Identifier (RFID)
Wireless Sensor Networks (WSN)
Internet of Things (IoT)
Cyber Physical Systems (CPS)
There are 2 classes of devices: Consumer and Industrial
Early consumer devices were based on very low speed, wired, basic protocols (Device ID, On, Off, Status)
The early consumer wired protocols were often not very reliable due to noisy wiring (in the home), or lack authentication and security, so anyone can ‘hack’ these systems
Industrial application devices were mostly proprietary and (naturally) expensive. Their focus is on reliability, and bandwidth was secondary.
Industrial applications such as Supervisory Control and Data Acquisition (SCADA) often has to operate over long distances in remote areas
Wired connections were replaced by wireless solutions over time to simplify the deployment of such remote systems (e.g., dedicated radio links, and later Cellular system such as GSM)
Standardized protocols such as Fieldbus and Industrial Internet were developed to address factory automation issues (production line control, assembly line robots, etc.)
Controller Area Networks (CAN bus) are commonly used in automotive applications (in-car diagnostics and control)
Generally wired connections are preferred for Industrial applications due to much better reliability compared with wireless solutions
Despite the general perception that IoT devices are battery operated wireless gizmos (such as Amazon Dash Buttons), the defintion of IoT is more encompassing.
The only criteria for IoT devices is that they perform specific functions (i.e., not PCs for general computing) and have Internet connections
Smart phones and Tablets are ‘sort-of’ IoT devices, although they are capable of general computing, they are often used to perform specific tasks (phone, messaging, eBook Reader, etc.) and are portable and wirelessly connected using the Internet
Low end devices often do not operate using Internet Protocols due to the high overheads of maintaining TCP/IP communications, both in terms of the protocol complexity as well as the bandwidth overheads (IP Headers are sent with each message)
WiFi (and Cellular) which is commonly used for Laptops, Smart Phones and Tablets, uses a lot of energy to operate, and are not suitable for low power IoT devices
Due to the large number of devices expected to be part of the IoT ecosystem, IPv4 addresses are insufficient, whereas IPv6 headers are 40 bytes (minimum) resulting in high overheads
IoT Gateways bridge these non-IP devices to the Internet, so they are considered as IoT devices as users can access them directly
The trend is for wireless communications due to ease of deployment, maintenance and mobility
Consumer appliances that have Internet access (typically Web-based) are now termed ‘Smart’
The use of Internet Protocols in place of proprietary solutions (especially for home security/monitoring) reduced the cost of implementation, and enables new services/access: remote monitoring using smartphones, cloud based services, etc.
Although smart consumer devices are widely known due to expansive marketing, it is only represents a niche area in IoT space. A lot of IoT applications are not consumer facing and hence hidden from public perception
Exchange of data between machines/systems to perform monitoring and control functions
Machine to Machine (M2M) communications were typically proprietary systems using proprietary protocols
licensed two-way radio systems (e.g., TETRA)
cellular based (GSM)
Example of consumer facing M2M communications is the Point of Sale terminal handling Credit Card transaction approvals
M2M Messages are often very brief, due to large number of devices to be supported, and limited communication link bandwidths
High deployment in utilities, weather sensing from remote stations, and industrial applications
Often require long range communications, therefore most short range wireless protocols such as WiFi are not suitable
Need for reliability also means unlicensed spectrum (802.15.4, WiFi) are less desirable
Modern dedicated energy efficient systems (LoRa, Sigfox) replacing two-way radio and GSM solutions (where bandwidth requirements are suitable)
Trend is moving towards cellular standards such as energy efficient LTE-M for IoT usage, and 5G
Passive RFIDs are not specifically IoT devices
The explanation provided is to provide an overview of the topic for a more comprehensive overview of the topic
Each RFID can be programmed with a unique Tag ID which allows identification of individual items
RFID started as a barcode replacement technology but has evolved to support more efficient logistics and micro-transaction systems due to the ability to store and update data in RFID device using RFID Readers
Near Field Communications (NFC) is the latest term for RFID technology (as opposed to Active RFID devices)
Active RFIDs have a lot in common with WSN devices in terms of the hardware platform.
The main difference is that Active RFIDs do not focus on data gathering functions.
There may be additional hardware requirements in terms of device security and tamper-proof hardware (to support event logging and validated transactions)
Active RFID devices are meant to operate with longer range to support higher mobility speeds and large area monitoring
While Passive RFID can only respond when queried by Reader (transponder devices), Active RFID devices can initiate transmissions and act as beacons
Wireless Sensor Network (WSN) devices are designed to be small, low cost, robust, and have extended battery lifetimes, for deployment in outdoor environments
Most WSN application involve sensors (data sources) sending information to a Monitoring station (data sink)
We’re usually more interested in the aggregate data obtained by WSN devices rather than data from a specific device. This allows for interchangeability and longer system lifetime since specific devices will fail due to battery exhaustion or other factors
In small areas, sensors communicate directly with the Monitoring station
However, this is not feasible in large coverage areas due to limited transmission range, so multi-hop communications, where data is forwarded from one sensor to another until it reaches the monitoring station, is used
Since multiple WSN devices in a given geographical area may return similar or identical data, some form of data aggregation will be necessary to reduce network traffic in multi-hop network configurations
Data aggregation also allows the system to achieve redundancy and device rotation to conserve battery life. If more than one sensor is reporting information for a given area, most of them can be put in sleep mode
The definition of Internet of Things (IoT) keeps evolving. However, the hardware platforms have a lot in common with WSN devices, except that IoT devices are designed to communicate using TCP/IP network protocols
Network effects (device volume and market momentum) drives innovation and have largely made proprietary technologies for applications such as SCADA, surveillance and security monitoring non-competitive in terms of cost
The danger of IoT deployment currently is that security issues are not addressed adequately – IoT is also referred to as Insecurity of Things
Older proprietary technology may not implement security adequately either, but due to the isolated nature of such systems the exposure and risks are relatively lower
Processing requirements of IoT devices is higher than non-IP technology due to the need to support IP-based communication protocols. Higher CPU performance is also needed to support web-based services directly on the device
The IoT revolution is very much driven by Moore’s law since higher performance 32-bit microcontrollers used for IoT devices today is as power efficient as older 8-bit devices used in the past
The focus of Cyber Physical Systems is on the “system” rather than specific components or devices
The important feature of CPS is in the feedback (monitoring) and control (output) loop for large systems involving many devices working in tandem
The cyber part of CPS refers to the algorithms and data representation used to capture the state and operational behavior of the physical system
Examples of Cyber Physical Systems include:
Smart utilities that balance renewal energy generation by consumers with grid output depending on time of day and fluctuating demand
Self-driving vehicles (e.g., Google Car) which operate without human intervention
Traffic management system for smart cities that respond to real-time surges in traffic along specific transportation corridors (e.g., sports events, processions, accidents)
CPS are migrating towards the use of IoT devices, due to replacement of proprietary systems by Internet-based solutions in many domains
The details of spetrum allocation can be found in the IEEE standard documents
Sub 1 GHz spectrum is scarce as it has been allocated for other uses in the past where bandwidths were much less that the digital transmissions used today
The number of channels refer to the channels that can be used concurrently.
The TV White Space spectrum (54 – 862 MHz) in North America is allocated to 802.15.4 as secondary users, i.e., if there are existing services on specific channels, they are not available for use (hence variable number of available channels)
The only spectrum that can provide interoperability worldwide is the 2.4 GHz ISM Band. The number of available channels was increased in the 2006 version of the standard. Each channel has 2 MHz of spectrum allocation.
Nonetheless, the ISM Bands are shared spectrum so interference from other protocols (e.g., WiFi, Bluetooth), may mean that actual number of available channels are much lower
Generally 802.15.4-based devices use non-IP communications due to the small frame sizes (127 bytes per frame) for efficiency reasons
IP support is provided by the 6LoWPAN Adaptation Layer which maps IPv6 packets into multiple 127-byte 802.15.4 data frames (this is expanded upon in the Module on Internet Gateways)
Lower frequency bands (sub 1 GHz) are preferred for longer range applications such as smart utilities (WiSUN) due to RF propagation characteristics
Various extensions to the IEEE 802.15.4 standard include different modulation techniques for the same spectrum
Devices that use different modulation types cannot communicate with each other (i.e., they must speak the same ‘language’)
Different modulation standards operating in the same area will cause interference with each other (similar to issue with WiFi and Bluetoooth in 2.4 GHz ISM Band)
The name Bluetooth refers to the ancient Viking King Harald Bluetooth
Bluetooth was primarily developed as a cable replacement technology operating in the 2.4 GHz spectrum (shared with other technologies such as WiFi)
Although the original Bluetooth standard (1.x) was adopted as an IEEE standard 802.15.1, subsequent versions were not submitted to IEEE for standardization (which are often subsequently adopted by other national standard bodies as equivalent national standards), so they are known as Industry standards under the control of the Bluetooth SIG
In a Star Topology devices are slaves under the control of the master (PC). There is a link establishment process where slaves and master have to configure identical PIN numbers to generate an encryption key for further communications. Once the key has been set, communications can established without user intervention.
The Bluetooth standard cover many optional components. Most of them refer to Profiles, introduced in Bluetooth 2.x, that define the communication protocols used between devices. Since devices are free to implement subsets of protocols, it is often a hassle to ensure that all devices can interoperate
The evolution of Bluetooth since the 2.x version is not very orderly. Bluetooth 3.x depends on the presence of WiFi hardware module to transfer large amounts of data, so it is more of a hybrid technology
Bluetooth 4.x (Bluetooth Low Energy) implements an incompatible modulation scheme for low power, broadcast type communications. It was originally developed as Wibree and is now known as “Bluetooth Smart”. Masters need to support classic Bluetooth and Bluetooth Smart concurrently if they want to access both types of devices.
Bluetooth 5 increases the range and throughput of Bluetooth Low Energy, and supports Mesh configurations
The IoT use cases focus mainly on Bluetooth Low Energy since it was designed for low power battery operation
WiFi (802.11) technology has become one of the most successful data communications technology as it serves as a replacement for Ethernet cabling
Two major frequency bands have been allocated to WiFi usage, 2.4 GHz and 5 GHz. The bandwidth allocation in the 5 GHz UNII band is larger, and is less congested
The modulation and channel access techniques in the 2.4 GHz and 5 GHz bands are different from each other
Commercial success of WiFi technology has helped to ensure that newer standards maintain backward compatibility with previous standards, i.e., devices supporting 802.11ac will also typically support previous 802.11 a,b,g,n standards
802.11 family of standards have the highest throughput among the other wireless standards presented. However, it is not suitable for battery operated IoT devices since the energy consumption to operate WiFi is much higher (battery life measured in hours).
802.11p has been adopted for use by Vehicular Networks, which uses dedicated spectrum in the ITS (Intelligent Traffic System) Band to avoid interference from other WiFi users
There is a new standard 802.11ah that is being developed for IoT use but it is not interoperable with existing 802.11 standards
Although the standard defines 11 or 14 channels for the 2.4 GHz band, the channel frequencies overlap, and only 3 non-interfering channels can coexist (4 for Japan which has Channel 14)
Most enterprise WiFi deployment will use Channels 1, 6 and 11 to maximize the network capacity. Nonetheless, enterprise WiFi deployments have generally moved to use 5 GHz spectrum (802.11a,n) with 2.4 GHz spectrum as fallback
Since 2.4 GHz spectrum is the ISM Band, many other users such as wireless microphones, vehicle door entry remotes, wireless keyboard and mice, will cause interference with WiFi
Since Bluetooth and WiFi tend to be used together on modern PCs, the 802.15.2 standard was defined to reduce the interference between these two technologies.
802.11 is based on Direct Sequence Spread Spectrum (DSSS) while Bluetooth is based on Frequency Hopping Spread Spectrum (FHSS), which operate using different principles
By selecting suitable channel hopping sequences for Bluetooth, it is possible to reduce the number of times when both are transmitting on the same frequencies
802.11b support max bandwidth of 11 Mbps, but actual throughput between two stations is less than 5.5 Mbps, due to the need to perform handshaking before transmission and only one station can transmit at a given time (half-duplex communications).
Multicast data transmission where one transmitted packet can be received by multiple stations in the same area is implemented using 2 Mbps for better reliability and Signal to Noise Ratio (SNR)
802.11g reuses the channel frequency to implement a different modulation techique (Orthogonal Frequency Division Multiplexing – OFDM)
OFDM is more efficient compared to DSSS and can achieve 54 Mbps using similar spectrum bandwidths
Nonetheless, the initial preamble transmission allows stations to fall back to older modulation types when necessary
To achieve even higher link speeds, new technologies such as Multiple Input Multiple Output (MIMO) which uses multiple antennae to send and receive data is necessary
This is combined with larger spectrum per channel (achieved via ‘channel bonding’) to give the 150 Mbps to 600 Mbps link speed of 802.11n
For North America, only three 20-MHz channels are available. Consequently only one 40-MHz bonded channel can be utilized.
Actual available link speeds depend on whether other 802.11 legacy users exist on the spectrum and how much interference they generate. Usage of bonded channels for 802.11n basically deny 802.11 legacy users access to free spectrum and mixing of 802.11n with older equipment in the same area is not recommended
This diagram illustrates the clash in spectrum usage between WiFi (22 Mhz), Bluetooth Low Energy (1 Mhz) and Zigbee (802.15.4) (2 MHz) technologies.
In order to reduce interference, specific channels not overlapping other major spectrum users is used by Bluetooth Low Energy as Advertisement Channels
Nonetheless, the key point of this figure is that spectrum sharing among competing services work only if each service transmit low to moderate amounts of data. High data rate services or too many users will render the ISM band unusable.
Applications requiring reliable and timely communications should not depend on 2.4 GHz ISM band for their operation
The 5.8 GHz UNII Band is mostly used by WiFi services, and has much larger spectrum allocation compared to the 2.4 GHz band
The drawback of 5.8 GHz is the coverage area is reduced compared to 2.4 GHz due to RF propagation distance being inversely related to frequency.
This can also be an advantage in supporting more users, at the expense of requiring more Access Points to cover the same area compared to 2.4 GHz
Gigabit speeds are being achieved through the use of MIMO and Channel Bonding techniques
These are the less common 802.11 standards that have been developed
Most of them are used in niche areas that are not consumer oriented
The 802.11ah standard is still undergoing development and standardization
Narrowband channels to support lower data rates in sub GHz ISM Bands
Longer range due to lower frequencies
Multihop capability using Relay Access Points (RAP) for range extension
Scheduled sleep mode (Target-Wake-Time) to extend battery life
Larger number of nodes supported since not all will be transmitting concurrently
The target usage is for low bandwidth IoT applications
Competing technologies such as LoRa and Sigfox are meant for long range transmissions
Assume required bandwidths are very low and need infrequent updates
Only suitable for remote SCADA and long term environmental data collection and monitoring (not for disaster/unexpected event reporting)
Minimal public information available due to proprietary technology
Cellular based solutions
Cellular solutions operate on spectrum assigned by individual countries
Existing cellular solutions are based on GSM which provides only about 10 kbps bandwidth
GSM has been used primarily for remote SCADA applications or low bandwidth wide-area applications such as fleet and inventory tracking
LTE-based solutions were too energy intensive and meant for high bandwidth applications
Cat-M1, NB-IoT (Cat-M2? [Name is not standardized yet]) and EC-GSM-IoT are newer standards introduced for IoT applications in 3GPP Release 12 and 13
Important standard bodies can be categorized into three categories:
Non-government (non-profit) organizations
International Electrical and Electronics Engineers (IEEE) is a US based professional body that was instrumental in standardizing many of the networking technologies in use. These standards often form the basis for standards adopted by other international bodies.
Internet Engineering Task Force (IETF) is a US-based organization currently operating under the Internet Society as a standards setting organization responsible for Internet-related Protocols
International body responsible for defining networking standards (among other important standards) is the International Organization for Standardization (ISO) which standardized the Open System Interconnect (OSI) network reference model. Members in ISO consists of national standard bodies of various countries
International Society of Automation (ISA) is a professional body focused on instrumentation and automation. The ISA100.11a standard has been promoted for industrial IoT applications.
Government related
United Nations body responsible for defining telecommunications standards and spectrum allocation is the International Telecommunications Union (ITU). ITU-T is the Telecommunications Standards Sector responsible for standards related to telecommunications and computer communications
Industry-based organizations
Various industry-based organizations have been set up to promote and regulate IoT related standards, notably for certification of conformance via interoperability testing, without which products cannot carry the respective certification logo. Most industry-based organizations are funded by commercial memberships and some standard documents are only available to paid members.