A rocket carrying CubeSats launched into Earth orbit two years ago, on 22 March 2021. Two of those CubeSats represented competing approaches to bringing the Internet of Things (IoT) to space. One, operated by Lacuna Space, uses a protocol called LoRaWAN, a long-range, low-power protocol owned by Semtech. The other, owned by Sateliot, uses the narrowband IoT protocol, following in the footsteps of OQ Technology, which launched a similar IoT satellite demonstration in 2019. And separately, in late 2022, the cellular industry standard-setter 3GPP incorporated satellite-based 5G into standard cellular service with its release 17.

In other words, there is now an IoT space race.

Read more: CubeSat Operators Launch an IoT Space Race

In addition to Lacuna and Sateliot, OQ Technology is also nipping at the heels of satellite telecom incumbents such as Iridium, Orbcomm, and Inmarsat for a share of the growing satellite-IoT subscriber market. OQ Technology has three satellites in low Earth orbit and plans to launch seven more this year, says OQ Technology’s chief innovation officer, Prasanna Nagarajan. OQ has paying customers in the oil and gas, agriculture, and transport logistics industries.

Sateliot, based in Barcelona, has the satellite it launched in 2021 in orbit and plans to launch four more this year, says Sateliot’s business development manager, Paula Caudet. The company is inviting early adopters to sample its service for free this year while it builds more coverage. “Certain use cases are fine with flybys every few hours, such as agricultural sensors,” Caudet says.

OQ Technology claims it will launch enough satellites to offer at least hourly coverage by 2024 and near-real-time coverage later that year. Sateliot is also aiming for better-than-hourly coverage sometime in 2024 and near-real-time coverage in 2025.

Incumbent satellite operators are already offering IoT coverage, but so far they require specific IoT hardware tuned to their spectrum bands and protocols. Insurgent companies that make use of the 3GPP release 17 standard will be able to offer satellite connectivity to devices originally designed to connect only to cellular towers.

New companies also see an opportunity to offer lower, more attractive pricing. “Legacy satellite providers were charging maybe [US] $100 for a few kilobits of data, and customers are not willing to pay so much for IoT,” says Nagarajan. “There seemed to be a huge market gap.” Another company, Swarm, which is a subsidiary of SpaceX, offers low-bandwidth connectivityvia proprietary devices to its tiny satellites for $5 per month.

Thanks to shared launch infrastructure and cheaper IoT-compatible modules and satellites, new firms can compete with companies that have had satellites in orbit for decades. More and more hardware and services are available on an off-the-shelf basis. “An IoT-standard module is maybe 8 or 10 euros, versus 300 euros for satellite-specific modules,” says Caudet.

In fact, Sateliot contracted the construction of its first satellite to Open Cosmos. Open Cosmos mission manager Jordi Castellví says that CubeSat subsystems and certain specialized services are now available online from suppliers including AlénSpace, CubeSatShop, EnduroSat, and Isispace, among others.

By building constellations of hundreds of satellites with IoT modules in low Earth orbit, IoT-satellite companies will be able to save money on hardware and still detect the faint signals from IoT gateways or even individual IoT sensors, such as those aboard shipping containers packed onto cargo ships at sea. They won’t move as much data as voice and broadband offerings in the works from AST SpaceMobile and Lynk Global’s larger and more complex satellites, for example, but they may be able to meet growing demand for narrowband applications.

OQ Technology has its own licensed spectrum and can operate as an independent network operator for IoT users with the latest 3GPP release—although at first most users might not have direct contact with such providers; both Sateliot and OQ Technology have partnered with existing mobile-network operators to offer a sort of global IoT roaming package. For example, while a cargo ship is in port, a customer’s onboard IoT device will transmit via the local cellular network. Farther out at sea, the device will switch to transmitting to satellites overhead. “The next step is being able to integrate cellular and satellite services,” Caudet says.

This post was updated on 28 March to clarify the planned launch schedules and coverage schedules for OQ Technology and Sateliot.

First published by IEEE Spectrum: [html].

IN 2023, YOU OR someone you know will be able to send a text message through space. Late in 2022, hardware behemoths Huawei and Applereleased cellular telephones capable of texting on traditional satellite-communications networks. A pair of ambitious startups, AST SpaceMobile and Lynk Global, also started building new low Earth orbit (LEO) satellite networksdesigned to reach conventional 5G cellphones outside terrestrial coverage.

“Offering direct satellite access to smartphones without modifications would allow access to billions of devices worldwide,” says Symeon Chatzinotas, the head of the University of Luxembourg’s SigCom research group.

Read more: No More ‘No Service.’

Users looking to connect via satellite won’t need the bulky, expensive commercial satphones that have been available since the late 1990s—but they also won’t have conventional calling or high-bandwidth data streaming just yet. Satellite connections are still plenty useful, though. To begin with, people could use texting to signal for help if need be, no matter where they are, as long as they have a clear view of the sky. That is, their mobile phones will have capabilities similar to existing pocket devices like Garmin’s inReach communicator.

Huawei has not said when its service will begin working, but Apple’s partnership with Globalstar, dubbed Emergency SOS via satellite, has been operational since November 2022. As of this writing, Lynk Global has agreements with 23 telecom providers to begin commercial operations in 2023. AST SpaceMobile says it plans to launch its first five commercial satellites late in 2023, has agreements or understandings with more than 25 telecom providers around the world, and should begin commercial operations in 2024.

An AST SpaceMobile employee sets up a test unit of the BlueWalker 3 satellite’s modular antenna array; the final array includes 148 such units. AST SPACEMOBILE

Splashy announcements of satellite-cellular connectivity from Apple, Starlink, and T-Mobile in the third quarter of 2022 promoted the idea of anywhere, any-kind connectivity. The first services won’t be that slick, though. Apple and Huawei will both connect initially to older satellites in higher orbits, for which it could take more than 10 minutes to establish a connection. Even the newer LEO networks, such as Lynk Global’s, currently advertise satellite texting but are not yet promising the higher-capacity link that a voice or video call would require.

AST SpaceMobile says that as the company adds satellites, it will be up to its mobile-network-operator (MNO) partners to decide whether to market the bandwidth in small increments to many users for texting or voice-only calls or to offer data-heavy services to select users. Lynk doesn’t mind its competitors’ aspirational advertising campaigns, says Lynk Global CEO Charles Miller: “They educated the market. It’s only going to make people want more.”

The tech that’s moving cell towers into space

This mock-up shows the app for Apple’s Emergency SOS via satellite, which enables emergency texting in areas with no terrestrial coverage. APPLE

These new offerings are possible thanks to a handful of advances that are now maturing. Advances include the declining cost of satellite manufacturing and the shrinking size of satellites themselves, making it affordable to build many more satellites than in the past. And with many more of them, it’s possible to put the satellites into lower orbits, between 300 to 600 kilometers above Earth, where each covers less ground. But closer satellites allow handsets with less power to reach them.

Another improvement is in software-defined radios—chips that can transmit and receive on different wavelengths modulated by software running aboard the satellite. In the past, sending and receiving such a wide range of different wavelengths required distinct hardware. Digital signal processing enables these chips to do the work of a complicated array of hardware. “Software-defined radio means the phased-array antennas can do frequency hopping as we switch from country to country,” Miller says. That technology makes it viable to pack more antenna capability into less space—Lynk will start with relatively small 1-square-meter antennas, but it plans to install bigger, more effective ones on its satellites in the future.

AST SpaceMobile chief strategy officer Scott Wisniewski says larger antennas are a big part of AST’s strategy: “We think that’s very important to communicate with low-power, low-signal-strength phones.” AST plans to deploy antennas up to around 400 m2, which would be the largest commercial telecom arrays in LEO.

	SATELLITES DEPLOYED BY END OF 2023	PLANNED CONSTELLATION SIZE	ORBITAL HEIGHT OF CONSTELLATION	CONSTELLATION COMPLETION DATE	SIZE OF INDIVIDUAL SATELLITES
AST SPACEMOBILE	5 Block 1 Bluebirds	~170 satellites	550-700 km	First commercial service in 2024	Block 1 Bluebirds:  64 m2antennas Block 2 Bluebirds: 128 m2antennas
LYNK GLOBAL	12 satellites	5,110 satellites	500 km	2027	First generation:  1 m2satellites Second generation:  4 m2satellites

Even so, having phones communicate with satellites rather than cell towers is tricky because of the much larger signal delays. “Everything about a phone is built around time-synching on the order of 5 to 10 milliseconds,” Wisniewski says. “That works just fine with a tower that’s a quarter mile away, 3 miles away even, but not for orbit.” AST is developing hardware solutions with Nokia and Rakuten that tell the core network how to wait longer for satellite signals.

In 2023, Apple and Huawei will be testing how much use they can get from older communications satellites through their flagship handsets, equipped with new chips. Meanwhile, if things go according to Lynk Global’s plan, by spring of 2023 the company will be offering commercial service to its MNO partners. AST may have its first commercial satellites in space but would still be testing and configuring them.

Network operators “historically asked ‘How is this possible?’” Wisniewski says. “Lately it’s more about ‘How can we use this best, when can we use this, what’s the best market strategy for each market?’” For people living in certain countries, 2023 could be the year when they are no longer troubled by the words “No Service.” 

First published by IEEE Spectrum: [html]