What is IEEE 802.15.6?

IEEE 802.15.6 is the standard for Wireless Body Area Networks, defining three PHY layers: Narrowband (400 MHz, 900 MHz, 2.4 GHz), Ultra-Wideband (3.1-10.6 GHz), and Human Body Communication (capacitive coupling through body tissue at 10-50 MHz). It specifies MAC protocols optimized for medical reliability, QoS levels for different data priorities, and security for health data protection.

On-body vs in-body propagation?

On-body: signals propagate along the skin surface. Path loss at 2.4 GHz is 30-80 dB depending on body position, orientation, and movement. In-body (implants): signals travel through tissue with much higher attenuation (3-10 dB/cm at 400 MHz). MICS band (402-405 MHz) is designated for implant communication because lower frequencies penetrate tissue better.

Most consumer BANs use BLE (smartwatches, fitness trackers). IEEE 802.15.6 is designed for clinical-grade reliability with QoS guarantees needed for continuous patient monitoring. BLE lacks the medical QoS and in-body PHY options. In practice, BLE dominates consumer wearables, while 802.15.6 targets hospital and implant applications.

Emerging RF Technology

Body Area Network

A Body Area Network (BAN or WBAN) is a wireless network of sensors and actuators worn on or implanted in the human body, communicating at ultra-low power over distances of 1-3 meters. IEEE 802.15.6 defines three PHY layers: Narrowband (400 MHz/900 MHz/2.4 GHz), Ultra-Wideband (3.1-10.6 GHz), and Human Body Communication (capacitive coupling at 10-50 MHz). Applications include continuous ECG/SpO2 monitoring, glucose sensing, drug delivery, and clinical patient telemetry.

Category: Emerging RF Technology

Standard: IEEE 802.15.6

Range: 1-3 m

Understanding Body Area Networks

BANs operate in a unique propagation environment: the human body is a lossy dielectric medium that absorbs, reflects, and scatters RF energy. On-body channels (wrist to chest, for example) experience 30-80 dB path loss at 2.4 GHz, with large variations due to body posture and movement. In-body channels (implant to external) suffer 3-10 dB/cm tissue attenuation, favoring lower frequencies (MICS band, 402-405 MHz).

SAR (Specific Absorption Rate) limits are critical: FCC limits SAR to 1.6 W/kg averaged over 1 g of tissue. BAN devices operate at very low power (typically −10 to 0 dBm TX) to meet SAR limits and extend battery life of implanted devices to 5-10 years.

BAN Link Budget

On-body (2.4 GHz, wrist to chest):
PL = 30-80 dB (posture dependent)
TX: 0 dBm, RX sens: −90 dBm
Margin: 10-60 dB

In-body (MICS, 5 cm depth):
PL = 40-60 dB (tissue + antenna)
TX: −16 dBm (SAR limited)

BAN PHY Comparison

PHY	Frequency	Data Rate	Use Case
Narrowband	400/900/2400 MHz	75-971 kbps	General on-body
UWB	3.1-10.6 GHz	0.5-15 Mbps	High-rate imaging
HBC	10-50 MHz	164 kbps	Touch-based pairing
MICS	402-405 MHz	200-800 kbps	Implants

Common Questions

Frequently Asked Questions

IEEE 802.15.6?

WBAN standard: Narrowband, UWB, HBC PHYs. Medical QoS, security for health data, optimized for body propagation.

Propagation?

On-body: 30-80 dB at 2.4 GHz, posture dependent. In-body: 3-10 dB/cm tissue loss. MICS (402 MHz) best for implants.

BAN vs BLE?

BLE dominates consumer wearables. 802.15.6 for clinical QoS and implants. BLE lacks in-body PHY and medical QoS.

Related Terms

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Medical IoT

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