Everything you need to know about LoRa
History of LoRa
LoRa got started in Grenoble, France in 2009. It was developed through the collaboration of two friends who wanted to develop a long range radio that consumed small amounts of power. Along with another collaborator they formed a company called Cycleo who set out to develop LoRa, which is simply short for ‘Long Range’.
Their intention was to develop and sell their designs to chip manufacturers, their target market being the utility metering industry. In 2012 Cycleo were acquired by Semtech , a US manufacturer of semiconductors.
In collaboration with the founders of Cycleo, Semtech produced two transceiver chips for use in user equipment (IoT) devices and others for network gateways and routers. Along with the hardware, they created a proprietary networking protocol, defining the mechanisms by which devices talk to the network and how radio channels are managed.
In 2015 the LoRa Alliance was founded and the network protocol was named LoRaWAN. The LoRa Alliance was created to “support and promote the global adoption of LoRaWAN standards by ensuring interoperability of all LoRaWAN products and technologies.”(source, LoRa Alliance).
LoRa Alliance members include Cisco, IBM, Amazon, BT, Orange, KPN and NTT.
Whereas Sigfox only build public networks, either themselves or through licensees. The LoRa Alliance strategy is to provide a standardised set of networking equipment with which both public and private networks can be built.
As of March 2021 there were some 178 million devices connected to over 140 public and private LoRa networks globally.
Long Range Technology
LoRa networks use the same unlicensed frequency bands as Sigfox , these are based around 868 MHz in Europe and 915 MHz in North America. LoRa uses these frequencies in a different way to the Sigfox UNB (Ultra Narrow Band) approach where devices send and receive on a narrow 100 Hz wide channel.
Messages on LoRa networks use a spread spectrum modulation technique known as CSS (Chirp Spread Spectrum) operating in bandwidth channels of 125 kHz or 500 kHz for uplink messages and 500 kHz for downlink. CSS modulation allows for higher bit rates than Sigfox, typically 25 kbps – 50 kbps, but slightly lower than those for NB-IoT.
LoRa networks are built in a star topology with customer devices communicating with an intermediary device called a gateway which concentrates user traffic for transmission to the network server. LoRa gateways are not expensive, typically £1k - £2K for a carrier-grade device designed to operate outdoors (IP67 rated) on the roof of a building. A LoRa gateway working in an office environment can be purchased for around £100.
The range of a gateway is 2km-5km (urban) and up to 15 km (suburban), slightly less than Sigfox in an urban environment and about half the range of Sigfox for suburban locations. In that respect LoRa has a disadvantage when compared to Sigfox, although the low cost of the gateways allows for more numerous deployments of them. LoRa operates fully bi-directionally unlike Sigfox which is constrained in its network to device capability.
There can be multiple LoRa networks within a city, both public and private, so to build a private LoRa network within a building is relatively inexpensive, although unlike a public network the private network owner has to fund the operating costs. Unlike Sigfox networks the actual data rates on LoRa depends on distance between the end-point device and the gateway.
In terms of security, LoRa supports end to end encryption using the AES128 algorithm.
Benefits of Using LoRa and the LoRa Ecosystem
The LoRa Alliance Catalogue gives customers a big range of IoT devices to choose from.
Standardisation around the Semtech SX127x series chipsets has allowed Alliance members to build their devices with certainty of connectivity to any LoRa network, public or private. Although cheaper to build than cellular NB-IoT hardware, at around $10 they are more expensive than a Sigfox module which is typically $5.
LoRa gives the benefit of low cost connectivity with long range when compared to technologies such as Wifi and Zigbee, excellent in-building penetration and very long battery life.
Mobile network operators such as Orange, Swisscom, KPN, Proximus and SK Telecom have all deployed LoRa public networks alongside their cellular IoT offerings. Application developers considering using LoRa for their IoT deployment can download the LoRa specification documents.
Getting on Board – Device Provisioning
Typical LoRa Applications
|Controlled access to waste recycling facilities||Public and employee safety.||Iioote and Rambo AB|
|Fuel Tank monitoring||Optimised delivery and collection routes, saving time and money.||FULLUP|
|Supply Chain & Logistics||40% improvement in ETA, 30% reduction in Opex.||SmartMakers|
|Smart Parking||Reduced driving time, Co2 reductions, improved capacity utilisation. Sensors connected to a mobile phone application route drivers to a vacant parking space.||Smart Parking Systems|
|Example Application||Messages/Day||Expected Battery Life*|
|Alarm Notifications||1-5||10 years|
|Low Use Sensors||5-25||7 years|
|High Use Sensors||25-100||5 years|
In terms of the number of IoT devices connected, LoRa is the most successful unlicensed wireless technology. However, a large proportion of connected devices are on private networks.
The number of devices connected on public LoRa networks is not clear. A LoRa Alliance member, The Things Industries report 55% of gateway shipments in 2020 were to public network operators, indicating that around half the claimed 178 million connections are from paying customers.
For the customers wanting to connect their devices rather than build and operate their own network, you can find all the information on public LoRa networks.
Whereas Sigfox is more limited in its use cases and has positioned itself as complimentary to cellular networks the higher data rates of LoRa puts the technology into direct competition with the mobile operators as they roll out NB-IoT.
Most use cases for LoRa are within the scope of NB-IoT which offers lower latency, better security and slightly higher data rates than LoRa. Where very low power consumption is the most important criteria LoRa is a better option.
In January 2020 the LoRa Alliance announced 2.4 GHz LoRa, a technology competing with Wifi but with a range of up to 300 metres in free space. Semtech transceivers were already available and ecosystem partners have incorporated 2.4 GHz cards into their sub GHz gateways.
This technology allows location based services with a sub 5 metre accuracy to be deployed on LoRa networks, the advantage over traditional GNSS (satellite) being much lower power consumption and simpler, cheaper electronics. This development opens up a big market for tracking packages, pallets or any goods in transit where no power supply is available.
The momentum LoRa has gained over the last 5 years suggests it is here to stay and will remain a credible technology for IoT connectivity.