LoRa
Semtech LoRa® PHY technology enables Amazon Sidewalk to expand while supporting fixed and mobile IoT endpoints
Introduction:
Semtech Corporation, a leading provider of high-performance semiconductor, Internet of Things (IoT) systems and cloud connectivity service solutions, is the creator and primary owner of the intellectual property (IP) for LoRa® technology, providing the Physical layer chips (PHY transceivers) used in LoRaWAN – the very popular Low Power Wide Area Network (LPWAN) for IoT endpoints.
The Camarillo, CA based company last week announced that LoRa® technology will continue to serve as the core radio modulation for Amazon Sidewalk across all markets in this year’s Sidewalk international expansion. Sidewalk’s global expansion officially begins in Canada and Mexico with further expansion to other international regions is scheduled for later in 2026. The network is projected to expand to over 30 new countries by year’s end.
Amazon Sidewalk is increasingly viewed as a commercial success in terms of infrastructure deployment and technical capability, transitioning from a niche smart home feature to a broad, LoRa-based Low Power Wide Area Network (LPWAN). While it faced initial skepticism regarding privacy and adoption, the network now boasts massive, passive coverage of over 95% of the U.S. population and is undergoing rapid international expansion.
Architectural role of LoRa in Sidewalk:
LoRa is the de facto wireless platform of LPWANs for IoT. Semtech’s LoRa chipsets connect sensors to the Cloud and enable real-time communication of data and analytics that can be utilized to enhance efficiency and productivity. LoRa devices enable smart IoT applications that solve some of the biggest challenges facing our planet: energy management, natural resource reduction, pollution control, and infrastructure efficiency.
Amazon Sidewalk aggregates spectrum in unlicensed bands and combines multiple physical layers, with Semtech’s LoRa modulation providing the long‑range, low‑power tier for neighborhood‑scale coverage beyond home Wi‑Fi and short‑range Personal Area Networks (PANs). By using ONLY LoRa as the core wide‑area PHY, Sidewalk evolves from a home‑centric LAN into a geographically distributed WAN that can support both fixed and mobile IoT endpoints across dense residential environments.
Network scale and coverage:
Sidewalk already covers roughly 95% of the U.S. population, making it one of the largest license‑free, consumer‑facing LPWA deployments, and the 2026 roadmap extends the footprint into Canada and Mexico first, followed by additional international markets later in the year. This expansion effectively turns Sidewalk into a multi‑continent overlay network, leveraging existing consumer premises equipment and LoRa‑enabled endpoints to provide persistent connectivity without requiring dedicated operator‑grade RAN build‑outs.
Technology differentiation vs other LPWAN options:
NB-IoT (included in ITU-R M.2150 IMT 2020 RIT/SRIT standard) holds the largest LPWAN share at roughly 54%–58% of total LPWAN connections, due to massive adoption in China which accounts for approximately 84% of all global NB-IoT connections. Outside of China, LoRaWAN is the clear market leader with a 41% share of connections. As of late 2025, there are over 125 million LoRaWAN end devices deployed globally, growing at a 25% annual rate. It is the preferred choice for private IoT networks, specifically in smart buildings, agriculture, and industrial asset tracking.
LoRa’s combination of long range, ultra‑low power operation, and mature ecosystem (silicon, gateways, and cloud stacks) gives Sidewalk a differentiated profile relative to alternatives such as narrowband cellular IoT and other unlicensed LPWAN modulation methods. For Amazon, anchoring Sidewalk on LoRa reduces RF and protocol fragmentation on the end‑device side while preserving flexibility to layer higher‑level Sidewalk services and security on top of the underlying LoRa/LoRaWAN protocol stack.
Market and ecosystem context:
Amazon Sidewalk now sits alongside large industrial and enterprise LoRaWAN networks, reinforcing LoRa’s position as the leading low‑power wide‑area connectivity technology in unlicensed spectrum. The LoRaWAN IoT connectivity market is forecast to grow from about 10.7 billion USD in 2025 to 44.8 billion USD by 2030 (33.1% CAGR), while LoRaWAN deployments have surpassed 125 million devices globally with a 25% CAGR, signaling a robust runway for Sidewalk‑class Massive IoT use cases.
Implications for device and service design:
For device OEMs and service providers, Amazon’s decision effectively de‑risks LoRa as a long‑term connectivity bet for consumer and prosumer IoT, given Sidewalk’s trajectory to tens of millions of active devices worldwide. Vendors integrating LoRa‑based designs can now target both traditional LoRaWAN operator networks and the Sidewalk ecosystem, enabling common hardware platforms to support smart home, safety, environmental monitoring, and asset‑tracking applications at neighborhood and city scale.
LoRa Enables Sidewalk’s Technical Evolution:
Chirp spread spectrum (CSS) modulation in LoRa technology provides the technical foundation enabling Amazon Sidewalk’s new capabilities:
- Enhanced Network Density: LoRa multi-spreading factor capability optimizes longer range and shorter time-on-air, supporting higher device concentrations in urban environments while maintaining reliable connectivity.
- Location-Based Services: Unique location accuracy service that combines the power of Wi-Fi, Bluetooth Low Energy (BLE) and GPS enables a new class of location aware devices that don’t need expensive cellular solutions for asset tracking applications.
- Hub-Less Deployments: Utilized for both out-of-band-diagnostics as well as signaling radio for battery-powered cameras, LoRa lowers the need for hubs/repeaters, reducing infrastructure complexity for consumers while extending effective coverage areas.
Proven Heritage of LoRa in Massive IoT Networks:
Semtech’s LoRa technology has been deployed by more than 170 major mobile network operators globally, with over 500 million connected devices across smart cities, utilities, logistics, unmanned aircraft systems, and industrial applications. This proven deployment heritage provides the technical foundation and ecosystem maturity required for Amazon Sidewalk’s global expansion.
The technology’s long-range capability, extending connectivity up to several kilometers from Sidewalk bridge devices, combined with its ability to penetrate buildings and operate in dense urban environments makes it uniquely suited for neighborhood-scale networks. LoRa provides free, long-range connectivity that consumers can rely on for years of battery-powered operation.
Building on CES 2026 Momentum:
Ring showcased its expanded product portfolio using LoRa at CES 2026, introducing comprehensive sensor families for security, safety and home automation. These products join the growing network of devices powered on Sidewalk, including water leak and freeze detection sensors, wearable devices and environmental monitoring solutions, all leveraging the connectivity advantages of LoRa.
The Sidewalk network’s architecture—combining LoRa for long-range communication with Bluetooth Low Energy for device setup—creates a robust, resilient IoT infrastructure that can scale to support millions of devices while maintaining the ultra-low power consumption critical for battery-operated sensors and cameras.
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About Semtech:
Semtech Corporation (Nasdaq: SMTC) is a leading provider of high-performance semiconductor, IoT systems and cloud connectivity service solutions dedicated to delivering high-quality technology solutions that enable a smarter, more connected and sustainable planet. Our global teams are committed to empowering solution architects and application developers to develop breakthrough products for the infrastructure, industrial and consumer markets.
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Backgrounder:
The Low Power Wide Area Network (LPWAN) market is focused on IoT WAN connectivity for devices (endpoints) that consume low power, send/receive short messages at low speeds, and have low duty cycles. There are two categories of LPWANs:
1] Cellular (e.g. NB-IoT and LTE Category M1) WANs using licensed spectrum.
2] Wireless WANs operating in unlicensed frequency bands.
While cellular may be the ultimate winner, Sigfox and LoRAWAN currently have a lot more market traction and are growing very fast. Other non-cellular LPWANs (Ingenu, Weightless SIG, etc.) are also getting some attention, but if there are too many commercially available LPWANs the market will be segmented and fractured.
Overview of LoRaWAN and Sigfox network:
Let’s look at the two most popular unlicensed band LPWANs:
1. LoRaWAN:
- LoRaWAN is specified by the LoRa Alliance which includes 47 network operators.
- The LoRa Alliance states on its website: “LoRaWAN™ is the open global standard for secure, carrier-grade IoT LPWA connectivity. With a certification program to guarantee interoperability and the technical flexibility to address the multiple IoT applications be they static or mobile we believe that LoRaWAN can give all THINGS a global voice.”
- For the Physical layer (PHY), LoRa uses a modulation scheme called chirp spread spectrum (CSS) and a radio both developed and sold or licensed by Semtech Corporation.
- About two years ago, Semtech licensed its technology to Microchip and NXP (like ARM, Semtech now licenses to other semiconductor companies). As a result, the core LoRa hardware (PHY layer) is no longer provided by a single global chip manufacturer.
- LoRaWAN defines the media access control (MAC) sublayer of the Data Link layer, which is maintained by the LoRa Alliance. This distinction between LoRa and LoRaWAN is important because other companies (such as Link Labs) use a proprietary MAC sublayer on top of a LoRa chip to create a better performing, hybrid design (called Symphony Link by Link Labs).
- Many of the LoRa Alliance companies building products are focusing on software defined enhancement and use the LoRaWAN defined MAC.
- LoRaWAN will most likely be best used for “discrete” applications like smart buildings or campuses, where mobile network connectivity is not needed.
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2. Sigfox:
- Sigfox has designed its technology and network to meet the requirements of mass IoT applications; long device battery life-cycle, low device cost, low connectivity fee, high network capacity, and long range.
- Sigfox has the lowest cost radio modules(<$3, compared to ~$10 for LoRa, and $12 for NB-IoT).
- A recent announcement from Sigfox noted the addition of a new service called “Admiral Ivory,” that makes possible to connect devices with hardware components costing as little as $0.20.
- An overview of Sigfox’s network technology is described here. It consists of: Ultra Narrow Band radio modulation, a light weight protocol, small frame size/payload, and a star network architecture.
- The Sigfox network is currently deployed in 36 countries, 17 of which already have national coverage.
- In February, Sigfox reached an agreement with mobile network operator Telefonica to integrate Sigfox’s low-powered connectivity into the Telefonica’s managed connectivity platform. By complementing Telefónica’s cellular connectivity offerings, with Sigfox’s LPWAN connectivity solution, customers can choose the most appropriate type of connectivity or combine them, implementing use cases and creating new service opportunities that otherwise may not have been possible.
- Additionally, Telefónica´s managed connectivity platform will integrate Sigfox’s cloud, which gives the company the ability to develop its own end-to-end IoT solutions, based on Sigfox’s connectivity solution and including device integration, as well as data collection and management.
- While Sigfox is a proprietary IoT network architecture, the company has provided their intellectual property library free of charge and royalty-free to semiconductor companies which have implemented chipsets with dedicated Sigfox interfaces or multi-mode capabilities. The list of chipsets/modules supporting Sigfox (+ multimode) includes: Pycom (+ WiFi, BLE=BlueTooth Low Energy), Texas Instruments (+ BLE), STMicroelectronics (+ BLE), Microchip/Atmel, Analog Devices (+ BLE), NXP, OnSemiconductor (SiP), SiLabs, M2Com, GCT Semiconductor (+ BLE, CatM1, NB-IoT, EC-GSM, GPS), Innocom, and Wisol.
- The current Sigfox ecosystem is composed of several chipset vendors, device makers, platform providers and solution providers.
- Here’s a graphic from the Sigfox website on their expanding network footprint:
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Sigfox’s LPWAN Interoperability using Internet Compression Technology:
In a phone conversation with Sigfox standardization expert Juan Carlos Zuniga last week, I learned that Sigfox plans to achieve LPWAN interoperability at the Application layer, rather than building multi-mode base stations with different radio access networks. Here’s a glimpse on how that might happen:
At the IETF 98 Bits-n-Bites event, March 30th in Chicago, Sigfox demonstrated IoT interoperability with internet compression technology. which enables LPWAN applications to run transparently over different IoT radio access network (RAN) technologies.
To achieve this milestone and enable IP applications to communicate over its network, Sigfox and Acklio implemented Static Context Header Compression (SCHC) -a compression scheme being standardized by the IETF IPv6 over LPWAN working group*, which Juan Carlos participates in. SCHC allows reducing IPv6/UDP/CoAP headers to just a few bytes, which can then be transported over LPWAN network small frame size for low-power, low-cost IoT applications.
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* The focus of the IPv6 over LPWAN working group is on enabling IPv6 connectivity over four different Low-Power Wide-Area (LPWA) technologies: Sigfox, LoRa WAN, WI-SUN and NB-IOT (from 3GPP).
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The demonstration platform was based on an Acklio compression protocol stack running on Sigfox-enabled devices and cloud-based applications over the live Sigfox network in Chicago. Two scenarios were demonstrated: 1] CoAP requests to legacy IP LPWAN devices, and 2] CoAP interoperability over the live Sigfox and cellular networks in Chicago with IP enabled endpoint devices.
“We are thrilled with this latest milestone in our quest to support and promote interoperability in the IoT,” said Juan-Carlos Zúñiga, senior standardization expert at Sigfox and co-chair of the IETF IntArea working group. “It is critical that the industry rallies together to adopt open internet standards to unlock the true potential of the IoT.”
Compression based technology for LPWAN application interoperability builds on Sigfox’s commitment to supporting the development of IoT interoperability as an active member of standards development organizations including the IETF, ETSI and IEEE 802. And the number of chip companies providing Sigfox network interfaces (see above list) is equally impressive.
References:
https://www.iotforall.com/a-primer-for-loralorawan/
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Juan Carlos will be following up with a blog post on LPWAN application layer interoperability as well as a more detailed description of the IETF work on LPWANs.
