Weightless is a standard for low-power wireless communication in public or private networks with end devices with “Internet of Things” (IoT) requirements such as limited throughput and relaxed latency. Although it can operate in any frequency band, it is currently defined for operation in license-exempt sub-GHz frequency bands (e.g. 138MHz, 433MHz, 470MHz, 780MHz, 868MHz, 915MHz, 923MHz).
The defining characteristics of Weightless-P are as follows:
- 100% bidirectional, fully acknowledged communication for reliability.
- Optimized for a large number of low-complexity end devices with asynchronous uplink-dominated communication with short payload sizes (typically < 48 bytes).
- Optimized for ultra-low-power consumption (at the expense of latency and throughput compared to cellular technologies).
- Standard data rates from 0.625kbps to 100kbps.
- Typical End Device transmit power of 14dBm (up to 30dBm).
- Typical Base Station transmit power of 27dBm (up to 30dBm). Weightless-P networks are composed of the following elements:
- End Devices (ED): the leaf node in the network, low-complexity, low-cost, usually low duty cycle
- Base Stations (BS): the central node in each cell, with which all EDs communicate via a star topology
- Base Station Network (BSN): interconnects all Base Stations of a single network to manage the radio resource allocation and scheduling across the network, and handle authentication, roaming and scheduling
Up until now the Weightless Specification has been made available exclusively to members of the Weightless SIG but we have elected to make it freely available to all developers now. Click the button below which will take you to a new page where will be asked to enter a few details about your organisation. We'll then immediately email you a link to the Specification.