Body area networks (BAN)

doc.: IEEE 802.15-06-0331

Submission

Slide 1

BAN (Body area networks)

DefinitionUsage scenarios

By. P. Victer Paul

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doc.: IEEE 802.15-06-0331

Submission

What is BAN ?

A Body Area Network is formally defined by IEEE 802.15 as, "a communication standard optimized for low power devices and operation on, in or around the human body to serve a variety of applications including medical, consumer electronics / personal entertainment

Slide 3

doc.: IEEE 802.15-06-0331

Submission

A WBAN consists of multiple sensor nodes

Each capable of sampling, processing, and communicating one or more vital signs (heart rate, blood pressure, oxygen saturation, activity) or environmental parameters (location, temperature, humidity,light).

Typically, these sensors are placed strategically on the human body or hidden in users’ clothes allowing ubiquitous health monitoring

Slide 4

doc.: IEEE 802.15-06-0331

Submission

Slide 5

Body Area Networks –Target PositionAverage power consumption, sustained data rate

1000 mW500 mW100 mW 50 mW 10 mW

1 Gbit/s

100 kbit/s

1 Mbit/s

10 Mbit/s

100 Mbit/s

1 kbit/s

10 kbit/s

Wireless USB

IEEE 802.11 a/b/g

Bluetooth

ZigBee

200 mW 20 mW

Body Are

a Netw

ork

5 mW 2 mW

doc.: IEEE 802.15-06-0331

Submission

Usage Scenarios

• Body senor network• Fitness monitoring• Wearable audio• Mobile device centric• Video stream• Remote control & I/O devices

Slide 6

doc.: IEEE 802.15-06-0331

Submission

Slide 7

Body Sensor Network

• Medical application– Vital patient data– Wireless sensors– Link with bedside monitor– Count on 10 – 20 sensors

• Five similar networks in range• Minimum setup interaction• Potentially wide application• Total traffic / patient < 10 kbps

doc.: IEEE 802.15-06-0331

Submission

Body sensor networks

Wireless sensor technology for health monitoring applications called Body Sensor Network.

BSN is a rich interdisciplinary area which revolutionizes the health care system by allowing inexpensive, continuous health monitoring with real-time updates of medical records via Internet

Slide 8

doc.: IEEE 802.15-06-0331

Submission

Slide 9

Fitness Monitoring

• Central device is MP3 player• Wireless headset included• Expand functionality

– Speed, distance– Heart rate, respiration monitor– Temperature sensor– Pacing information– Location information– Wristwatch display unit– Etc.

• Total system load < 500 kbps• Synchronization may go faster

doc.: IEEE 802.15-06-0331

Submission

Slide 10

Wearable Audio

• Central device is headset• Stereo audio, microphone• Connected devices

– Cellular phone– MP3 player, PDA– CD audio player– AP at home– Handsfree car– Remote control– Others

• Requires priority mechanism• Network load < 500 kbps

doc.: IEEE 802.15-06-0331

Submission

Slide 11

Mobile Device Centric

• Mobile terminal is central point• Covers broad set of data

– Sensors – vital, other– Headset– Peripheral devices– Handsfree / car

• Provide gateway to outside– Offload sensor data, other

• Requires priority mechanism• Network load < 500 kbps

doc.: IEEE 802.15-06-0331

Submission

July 2006

Stefan Drude, PhilipsSlide 13

Remote Control & I/O Devices

• Remote control device• Increase consumer convenience• Makes headset control practical• Stand-alone vs shared function• Combine with wristwatch display ?

• Printers• Identification, storage• Wireless pen

• Complement BAN functionality

doc.: IEEE 802.15-06-0331

Submission

July 2006

Stefan Drude, PhilipsSlide 14

Technical Requirements

• There is no specific standard for BANs– Current standards come close for specific use

cases, not broad enough– Issues: power consumption, discovery, QoS– Support for very low power devices, sensors

• Target less than 10% power consumption for communications compared to total device

• Have single standard with broad range of supported data rate - scalability

doc.: IEEE 802.15-06-0331

Submission

July 2006

Stefan Drude, PhilipsSlide 15

BAN Requirements - Draft

• Distance 2 m std, 5 m special• Piconet density 2 - 4 nets / m2 • Devices per network max. 100• Net network throughput 100 Mbit/s max.• Power consumption ~ 1mW / Mbps

(@ 1 m distance)

• Startup time < 100 us, or< 10% of TX slot

• Latency (end to end) 10 ms • Network setup time < 1 sec

(after initial setup, per device)

doc.: IEEE 802.15-06-0331

Submission

July 2006

Stefan Drude, PhilipsSlide 16

BAN Requirements - Draft

• Implementation module cost• Should be comparable to Bluetooth module

• Effective sleep mode(s)

• Concept for effective, remote wake-up

• Operates in global, license-exempt band

doc.: IEEE 802.15-06-0331

Submission

July 2006

Stefan Drude, PhilipsSlide 17

BAN Requirements - Draft

• Privacy, security• Peer to peer communication, point to multi-

point• Omni-directional antennas: small, flexible• Future proof [for 5 years?]

– Upgradeable, scaleable, backwards compatibility

• Support for several power management / consumption schemes [classes]

doc.: IEEE 802.15-06-0331

Submission

July 2006

Stefan Drude, PhilipsSlide 18

BAN Requirements - Draft

• Quality of service, guaranteed bandwidth– Specific definitions, depends on application

• Graceful degradation of services– Depends on application, not always desireable

• Concurrent availability of asynchronous and isochronous channels

• Low duty cycle and high duty cycle modes• Very low duty cycle applications (sensors)

doc.: IEEE 802.15-06-0331

Submission

July 2006

Stefan Drude, PhilipsSlide 19

Interest Group on BAN in 802.15 (2)Conclusions on low data rate applications

• Support different classes of QoS for high reliability, asymmetric traffic, power constrained

• Needs optimized, low complexity MAC and Networking layer

• High number of simultaneously operating piconets required

• Application specific, security/privacy required• Small form factor for the whole radio, antenna, power

supply system• Locating radios (” find me”) mode