The LoRa Alliance, the global association of companies backing the open LoRaWAN standard for internet of things (IoT) low-power wide-area networks (LPWANs), has announced that it has expanded the LoRaWAN link-layer standard with the addition of a relay specification. The relay feature allows for battery-operated, easy-to-deploy network coverage extensions at a fraction of the cost of adding additional gateways.
This allows LoRaWAN to achieve excellent coverage in use cases requiring deep indoor or underground coverage, or relay data on satellite connected LoRaWAN devices within proximity.
“LoRa Alliance members identified that end users in specific markets needed a solution to achieve full network coverage due to environmental challenges surrounding their deployments,” says Donna Moore, CEO and Chairwoman of the LoRa Alliance. “With relay, we’re providing a standardized solution that allows for full end-to-end communications in extremely challenging underground, metal and concrete environments where sensor signals could use a boost or redirect to reach either the gateway or end-device. The new relay feature is a direct response to market needs and provides an essential building block to enable massive IoT.”
One of the first markets to adopt relay is metering in the utilities sector, says the organization. Adding relay to the LoRaWAN standard to achieve coverage for even the most difficult cases (e.g., meters inside metal closets) significantly strengthens LoRaWAN’s market position in metering and utilities, and more broadly across key verticals including smart cities and buildings, and industrial IoT. Using relay, says the organization, is ideal for any application monitoring static assets in challenging environments.
While the LoRaWAN standard is proven for long range communications, there can be physical limits to where LPWAN communications can reach, such as around turns, underground, where a signal needs to be reflected/relayed into a specific location, etc. LoRaWAN relays allow signals to go where they physically couldn’t go before.
The TS011-1.0.0 LoRaWAN Relay Specification document describes the relaying mechanism used to transport LoRaWAN frames bi-directionally between an end-device and gateway/network server via a battery-operated node. By enabling relay, the device can transfer LoRaWAN frames between an end-device and network when there is insufficient coverage from the gateway.
This specification enables network coverage extension through battery operated relay and maintains compatibility with the LoRaWAN Link-Layer standard in terms of protocol and security. The new relay nodes are battery-powered and can be installed anywhere and do not require electricity or internet connectivity. This makes them a very easy to deploy, low cost and low power way to extend network coverage, without needing to add additional gateways. Relay end points allow LoRaWAN to provide coverage of all devices with only a nominal cost of installation.
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