Weightless Technology

Weightless is the proven, high-performance LPWAN connectivity technology for the Internet of Things. It uses a narrow band modulation scheme offering a bidirectional communications capability to enable unrivaled quality of service (QoS) and add on functionality. The Standard will provide fully acknowledged two-way communications offering both uplink and downlink capabilities and best in class QoS required for the stringent industrial IoT sector.

Weightless offers the promised performance, network reliability and security characteristics of 3GPP carrier grade solutions but significantly earlier than these technologies are likely to come on line. In addition the Standard will enable substantially lower costs, comparable to other LPWAN technologies, and less than 4uA power consumption in idle state compared to more than 3mW for the best cellular technologies.

Excellent capacity and scalability for IoT deployment

  • FDMA+TDMA in 12.5kHz narrow band channels offer optimal capacity for uplink-dominated traffic from a very large number of devices with moderate payload sizes

  • Operates over the whole range of license-exempt sub-GHz ISM/SRD bands for global deployment: 169/433/470/780/868/915/923MHz

  • Flexible channel assignment for frequency re-use in large-scale deployments

  • Adaptive data rate from 200bps to 100kbps to optimise radio resource usage depending on device link quality

  • Transmit power control for both downlink and uplink to reduce interference and maximize network capacity

  • Time-synchronised base stations for efficient radio resource scheduling and utilisation

Bidirectional

  • Supports both network-originated and device-originated traffic

  • Paging capability

  • Low latency in both uplink and downlink

  • Fast network acquisition

  • Forward Error Correction (FEC)

  • Automatic Retransmission Request (ARQ)

  • Adaptive Channel Coding (ACC)

  • Handover

  • Roaming

  • Cell re-selection

Long range

  • Lower data rates with channel coding provide similar link budget to other LPWAN technologies

  • 2km in urban environment

Industrial-grade reliability

  • Fully acknowledged communications

  • Auto-retransmission upon failure

  • Frequency and time synchronisation

  • Supports narrowband channels (12.5KHz) with frequency hopping for robustness to multi-path and narrowband interference

  • Channel coding

  • Supports licensed spectrum operation

Ultra-low energy consumption

  • GMSK and offset-QPSK modulation for optimal power amplifier efficiency

  • Interference-immune offset-QPSK modulation using Spread Spectrum for improved link quality in busy radio environments

  • Long device battery life using coin cell batteries

  • Adaptive transmit power and data rate to maximise battery-life

  • Power consumption in idle state when stationary below 4uA

Secure and efficient networking

  • Authentication to the network

  • AES-128/256 encryption

  • Radio resource management and scheduling across the overall network to ensure quality-of-service to all devices

  • Support for over-the-air firmware upgrade and security key negotiation or replacement

  • Fast network acquisition and frequency/time synchronisation

Low cost and complexity

  • Using standard GMSK and offset-QPSK modulation channels ensures broad availability of hardware and no dependency on a single vendor

  • Much leaner and optimised protocol ensures reduced system complexity and cost compared to cellular M2M or forthcoming NB-IOT

  • Limited additional complexity to enable quasi-symmetric bidirectional communication

  • Maximal transmit power of 17dBm allows for integrated power amplifier

Open standard

  • Brings the reliability and performance of cellular technologies at a fraction of the cost by avoiding any legacy or backward-compatibility concerns

  • Ensures interoperability between the manufacturers

  • Provides for multivendor support to stimulate ongoing innovation and minimise end user costs

  • Royalty free IP minimises production costs

Specification

Uplink Data Rate

Channel Access Method

Uplink Payload Allowance

Downlink Data Rate

Downlink Payload Allowance

100% Acknowledged Messages

Synchronous Network

Firmware OTA

Supported Frequencies

Downlink Channel Bandwidth

Uplink Channel Bandwidth

Weightless

0.625-100kbps

TDMA/FDMA

65,530 Bytes

6.25-100kbps

65,530

YES

YES

YES (Unicast, Multicast, Broadcast)

ISM Bands 868MHz,915MHz &more

12.5 kHz or 100 kHz

12.5 kHz sub-channels