Frequently Asked Questions
With all international networks, total uniqueness in the identity of the devices connected is a key requirement. Device EUI should be assigned from the IEEE unique database.
Semtech will provide details to the licensee about how data is protected and anonymised. All legal and local requirements will be taken into account in the detailed procedure defined.
Semtech and the licensee will define this to be compliant with all legal and local requirements
LoRa and NB IoT are both LPWAN technologies whereas 3GPP drives the NB IoT for carrier deployments in licensed band and LoRaWAN is an open standard driven by the LoRa Alliance.As there are material differences between the technologies the addressable markets and use cases are not the same. Overall the vision of the LoRa Alliance is that both technologies are complementary and based on the specific needs of a customer one is better off with either of the options.You can download the public whitepaper: “https://semtech.my.salesforce.com/sfc/p/E0000000JelG/a/E000000056Bf/JeMjZwyUqibxkZMhnf.GLiQmuM1uJnowBfso0MKTfD0” target=“_blank”>here.
Does the Semtech solution have to be integrated or can it be compiled as a stand-alone entity, can it be run as a service on a virtual machine?
The solution is provided as source code with full documentation. The system can be broken up into a number of different types of solution. It is easy to create virtual machine instances as well as fully integrating the core of the solution.
The files are provided in ‘C’ and ‘C++’ and are expected to be highly portable. The Semtech software support team is on-hand to enable smooth integration of the source code by any licensee.
The solution is provided as a complete end to end solution from gateway firmware to network service and controller through to website. The solution is provided to licensees in plain source code including all elements required to provide an end to end solution.
Semtech and the licensee will come to an agreement about how exactly this information is provided. A secure and electronic process will be defined.
The license is free of charge for the 2nd generation"location enabled” gateway, as are the 1st generation gateway reference designs.
In order to get as close to NLOS as possible it is important to observe the rules of propagation and try to get enough height in the gateway antenna to avoid the first Fresnel zone as much as possible. The mathematics defining the Fresnel zone are beyond the scope of this FAQ, however, as guidance, for an ISD of 4km, the antenna height should be 16m above the ground (and trees). With enough antenna height and an open landscape performance in the region of 10-30m have been observed.
With the early trial data, Semtech is recommending a 1.5km ISD in most urban cases as a guideline. There is, however, no substitute for detailed network planning and the coverage target should be four gateways. Targeting a configuration giving a four gateway redundancy means that in most cases, the sensor will be in coverage of all four, and in almost all cases will have the required minimum of three.
When we talk about the accuracy of the ranging it is important to draw a distinction between the different kinds of measurements of accuracy and to distinguish between accuracy and precision which are separate technical terms in the context of ranging.
Precision is a measure of the spread of our ranging results, accuracy is a measure of how far the measured distance is from the actual distance, the real distance is referred to as Ground Truth. A full description of these terms is given in our application note on the SX1280 ranging functionality.
With the latest version of the SX1280 development kit ranging firmware (available from the “https://developer.mbed.org/components/SX1280RF1ZHP/” target=“_blank”>Tools and SW area) we attain +/- 3 m of overall accuracy in line of sight conditions using the standard development kits mounted at 1.8 m and following the ranging guidance outlined in the ranging explanation document. Note that the accuracy seen is not a function of range, but rather the environment and obstructions between the radios. As we can see below, the accuracy is not significantly different at 50 m and at 2005 m.
SX1280 Developement kit
Ranging accuracy at 50m
Ranging accuracy at 50m