--- title: IoT Wireless Protocols url: https://doc.liz6.com/en/hardware/07-wireless-communications/02-iot-wireless-protocols locale: en area: hardware tags: - hardware - wireless-communications date: 2026-06-30 modified: 2026-07-16 description: A panoramic view of wireless protocols for low power, low data rate, wide-area coverage, or local area networking --- # IoT Wireless Protocols > A panoramic view of wireless protocols for low power, low data rate, wide-area coverage, or local area networking --- ## Protocol Comparison Overview | Protocol | Frequency Band | Data Rate | Range | Power Consumption | Networking | Typical Applications | |------|------|------|------|------|------|----------| | Zigbee | 2.4G/868/915M | 250kbps | 10~100m | Extremely Low | Mesh | Smart Home | | Thread | 2.4G/Sub-G | 250kbps | 10~100m | Extremely Low | Mesh | Smart Home | | Matter | IP Layer | - | - | - | Cross-Protocol | Unified Application Layer | | Z-Wave | 800~900M | 100kbps | 30m | Extremely Low | Mesh | Smart Home (Proprietary) | | LoRa | 433/868/915M | 0.3~50k | 2~15km | Extremely Low | Star | Sensors/Agriculture | | NB-IoT | Licensed Cellular | 250kbps | Several km | Low | Cellular | Meter Reading/Municipal | | NFC | 13.56M | 106~848k | <10cm | Extremely Low (Passive) | P2P | Payment/Access Control | | UWB | 3~10G | 6.8M~1G | <200m | Medium | P2P | Precise Positioning | --- ## Zigbee ### Features ``` Based on IEEE 802.15.4 Mesh Topology: Each node can relay → Large coverage area Self-healing: If a node fails → Automatically finds a new path Low Power: End devices can sleep (battery lasts for years) Disadvantages: - 2.4G band is crowded - Does not natively support IP → Requires a gateway for conversion - Vendor lock-in (although Zigbee 3.0 improves this) ``` ### Typical Network ``` Coordinator ×1: Creates the network, acts as the gateway Router ×N: Relays messages, must be constantly powered End Device ×N: Sleepy devices, battery-powered Common Applications: Philips Hue, Aqara, IKEA TRÅDFRI ``` --- ## Thread + Matter ### Thread ``` Shares roots with Zigbee (802.15.4), but natively supports IPv6 Mesh topology, uses 6LoWPAN to compress IPv6 packets Advantages: ✓ Every device has an IPv6 address → No application-layer gateway needed ✓ Truly decentralized (no single point of failure like a Coordinator) ✓ Border Router only acts as an IP bridge, does not perform protocol conversion Issue: Still requires a Thread Border Router (Built into Apple TV, HomePod, Google Nest Hub, etc.) ``` ### Matter ``` Matter ≠ Wireless Protocol! Matter is a unified application-layer standard Matter runs on top of these protocols: - Thread (Low-power Mesh) - WiFi (High bandwidth) - Ethernet (Wired) Problems Matter Solves: "You have to use an Aqara Hub for Aqara devices, and a Hue Bridge for Hue..." Matter → One device can be controlled by Apple Home / Google Home / Alexa simultaneously Note: Matter devices ≠ No Hub needed Thread devices still require a Thread Border Router (But they can be shared, not limited to a single brand) ``` --- ## LoRa / LoRaWAN ### Why LoRa ``` WiFi/BLE/Zigbee coverage is too small (tens of meters) Cellular modules are expensive + SIM card management is troublesome + High power consumption LoRa: Exchanges very low data rates for extremely long distances LoRa = Physical Layer (Semtech proprietary modulation) LoRaWAN = MAC + Network Layer (Open Standard) ``` ### Key Features ``` Sub-GHz bands (433/868/915 MHz): Good wall penetration, less interference Spread Spectrum Modulation (CSS): Can receive below noise floor (-140dBm sensitivity!) Data Rate: 0.3 kbps ~ 50 kbps (Higher spreading factor = slower but longer range) Link Budget: Max ~170dB → Urban areas 2~5km, Rural areas 10~15km Power Consumption: Transmit ~100mA, Sleep ~1μA ``` ### LoRaWAN Network Architecture LoRaWAN Network Architecture: Star-shaped access, gateways only forward, deduplication at the server Device Star Topology LoRa Gateway Forward Only · No Protocol IP Network Network Server Deduplication · Decryption · Routing The same uplink packet may be received by multiple Gateways simultaneously → Deduplicated by the Network Server Device Power Saving Classes (Class A / B / C) Class A · Mandatory Receive window opens after sending Most power efficient Class B Scheduled receive windows Scheduling delay exists Class C Receive always on (Mains powered) No delay Key Trade-off: Class A is most power-efficient but has downlink delay; it is the only mandatory class. Class C has no delay but requires continuous power. ### Applications ``` Agriculture: Soil moisture sensors (One every few kilometers, battery lasts years) Meter Reading: Water/Electricity meters (Sub-GHz penetrates basements) Tracking: Livestock/Assets GPS+LoRa Environmental Monitoring: Weather stations/Water quality ``` --- ## NFC / RFID ### NFC (13.56 MHz) ``` Ultra-short range (<10cm), based on inductive coupling Three Modes: Reader/Writer: Read/write tags (Access cards/Payments) Card Emulation: Phone emulates a card (Apple Pay/Transit cards) P2P: Small data exchange between devices (Android Beam, now marginalized) NFC Tag Types: Type 1/2 (NTAG): Most common, small capacity (<2KB) Type 4 (DESFire): High security, access/payment Type 5 (ISO 15693): Slightly further range (~1m), libraries Passive Tags: Derive energy from the reader's magnetic field → No battery needed ``` ### RFID ``` LF (125kHz): Animal implants/Access control, extremely short range HF (13.56MHz): NFC belongs to this category, libraries/ID cards UHF (860~960MHz): Logistics/Warehouses, up to 10m+ LF/HF: Magnetic field coupling (Near field) UHF: Electromagnetic wave backscatter (Far field) ``` --- ## UWB (Ultra-Wideband) ``` Ultra-short pulses (ns level) + Large bandwidth (>500MHz) → Time of Flight (ToF) accurate to centimeter level Features: - Indoor centimeter-level positioning (Much more accurate than WiFi/BLE) - Anti-multipath interference - Medium power consumption Applications: - Apple AirTag / U1 Chip - Car Keys (CCC Digital Key) - Indoor Navigation - Sports Tracking (e.g., Football) Frequency: 3.1~10.6 GHz (China: 6~9 GHz) ``` --- ## Quick Reference: When to Choose What ``` Battery Powered + Long Range (km level) → LoRa Battery Powered + Smart Home Mesh → Thread/Zigbee Need Direct IP Communication → Thread (IPv6) Multi-brand Interoperability → Matter Devices Payment/Access Control/Short Range → NFC Centimeter-level Indoor Positioning → UWB High Bandwidth + Low Latency + Power Insensitive → WiFi Wearables + Phone Communication → BLE Meter Reading + Cellular Coverage Available → NB-IoT (No need to build own gateways) ``` --- *Keywords: Zigbee, Thread, Matter, LoRa, LoRaWAN, NFC, RFID, UWB, 802.15.4*