Architecture:Protocols:NB-IoT

NB-IoT (Narrowband Internet of Things)

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Related

• Architecture:Protocols:Main_Page
• Architecture:Protocols:LoRa/LoRaWAN

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NB-IoT (Narrowband Internet of Things) is a cellular-based Low-Power Wide-Area Network (LPWAN) technology standardized by the 3rd Generation Partnership Project (3GPP). It is designed to enable large-scale deployment of low-power, low-data-rate devices over existing mobile networks.

NB-IoT is part of the LTE (4G) family and is considered a key technology for massive machine-type communication (mMTC) in the Internet of Things (IoT).

Overview

NB-IoT provides wide-area coverage, low power consumption, and the ability to connect a large number of devices. It operates in licensed spectrum bands and is typically deployed by mobile network operators.

Key characteristics include:

• Long battery life (up to 10 years)
• Deep indoor and underground coverage
• Support for massive numbers of devices
• Low to moderate data rates

Architecture

NB-IoT devices communicate directly with cellular base stations (eNodeB). The data is transmitted through the operator's core network and then forwarded to cloud services or application servers.

Typical data flow:

NB-IoT Device → Base Station (eNodeB) → Core Network → Internet → Application Server

NB-IoT supports standard IP-based communication, allowing integration with protocols such as:

• MQTT
• HTTP/REST
• CoAP

Technical Characteristics

Feature	Description
Spectrum	Licensed cellular bands
Bandwidth	~180 kHz
Data Rate	Up to ~250 kbps
Latency	Typically 1–10 seconds
Coverage	Excellent (including indoor and underground)
Power Consumption	Very low
Battery Life	Up to 5–10 years
Deployment	Operator-managed networks

Deployment Modes

NB-IoT can be deployed in three different ways within existing LTE infrastructure:

• In-band: Uses resource blocks within an LTE carrier
• Guard-band: Uses unused spectrum between LTE channels
• Standalone: Uses dedicated spectrum (e.g., refarmed GSM bands)

Use Cases

NB-IoT is widely used in applications that require reliable, low-power connectivity over large areas:

• Smart metering (water, gas, electricity)
• Smart city infrastructure (parking, lighting, waste management)
• Environmental monitoring
• Industrial IoT
• Asset tracking

Advantages

• Wide coverage, including difficult environments (basements, rural areas)
• Low power consumption enabling long battery life
• Utilizes existing cellular infrastructure
• High device capacity per cell
• Secure communication via cellular standards

Limitations

• Requires subscription to a mobile network operator
• Higher latency compared to some short-range technologies
• Not suitable for high-bandwidth or real-time applications
• Limited control over network infrastructure

Comparison with Other LPWAN Technologies

Feature	NB-IoT	LoRaWAN	Sigfox
Spectrum	Licensed	Unlicensed	Unlicensed
Network Ownership	Operator	Public or private	Operator
Data Rate	Moderate	Low	Very low
Payload Size	Medium	Small	Very small
Power Consumption	Low	Ultra-low	Ultra-low
Cost Model	Subscription	Gateway-based	Subscription

OSI Model Position

NB-IoT spans multiple layers of the ISO/OSI model:

• Physical Layer (Layer 1): LTE-based radio interface
• Data Link Layer (Layer 2): LTE MAC and scheduling
• Network Layer (Layer 3): IP-based communication

Application-layer protocols such as MQTT, HTTP, or CoAP operate on top of NB-IoT.