EQS Group-News: u-blox AG
/ Key word(s): Corporate Action
u-blox responds to the US FCC approval of the use of a previously protected wireless band for terrestrial cellular communications
Thalwil, Switzerland - August 26, 2021 - u-blox (SIX:UBXN,OTC:UBLXF), a global provider of leading positioning and wireless communication technologies and services, cautions against negative impacts of the US FCC's recent approval of the use of a previously protected portion of the L-band for terrestrial communication on global navigation satellite systems (GNSS) such as GPS and, subsequently, on our large US customer base.
Prior to the FCC's decision, the license, granted to the American satellite communications company Ligado, was limited to use for satellite communication terminals. Such terminals transmit radio waves directionally toward satellites and receive weak satellite signals.
Following the recent FCC order, Ligado will be free to use these frequencies, which are very close to those used by GNSS receivers, to transmit downlink signals from cell towers and uplink signals from user equipment. These signals are transmitted at dangerously high levels compared to those received by nearby GNSS receivers.
These signals threaten to disrupt the operation of GNSS receivers from any manufacturer operating in the vicinity of a Ligado base station or compatible cellular handset. In an internal study on the susceptibility of u-blox GNSS receivers to interference resulting from such activity, we confirmed that the transmissions would disrupt the operation of nearby GNSS receivers. Our findings, outlined in an application note, show that GNSS receivers would suffer performance losses anywhere near a transmitting Ligado handset and when located up to one kilometer from a Ligado base station, a greater distance than the permitted separation between base stations.
Although we have developed recommendations to mitigate these disruptions, it is important to note that implementing these on millions of deployed products would involve a considerable cost and an inconvenience to our customers and would also affect GNSS receiver performance to some extent. The same would be true for receivers from any other manufacturer.
u-blox rejects the FCC's testing criteria
The justification of this 1 dB criterion is quite simple. GNSS signals are well below the levels of the background noise. The lower the carrier-to-noise ratio, the poorer many aspects of performance become. For adequate performance, receivers operate with a finite link margin, and any reduction in the carrier-to-noise ratio represents a reduction of this link margin that will impact performance. The 1 dB criterion represents the smallest easily measurable change in carrier-to-noise ratio.
Protecting our US customer base
For decades, our customers have successfully designed their products to handle the expected levels of GNSS interference based on the absence of high-powered signals in nearby frequency bands. Now, in one fell swoop, the FCC has swept away that protection, leaving almost tens of millions of GNSS receiver applications at risk.
An unnecessary obstacle for autonomous vehicles and 5G
The presence of strong signals at frequencies close to GNSS frequencies will negatively impact the integrity performance of high integrity GNSS receivers. To address the reduction in integrity, car manufacturers will be forced to delay the deployment of autonomous vehicles in USA, the birthplace of GPS.
Even more paradoxical are the implications for the 5G deployments that the FCC's decision is meant to help facilitate. Public 5G cellular networks will require many more base stations than 4G networks. In urban areas and indoors, GNSS receivers will be required to keep these base stations in synch. But because these GNSS receivers will rely on fewer and even weaker signals than most GNSS receivers, their reliability and accuracy will be even more degraded by interference from strong cellular signals at frequencies close to the GNSS frequencies.
For the reasons stated above, u-blox strongly recommends that the FCC restore the original protection provided to the frequencies near the GNSS frequencies and prevent these frequencies from being used for terrestrial wireless communication - under any circumstances.
u-blox (SIX:UBXN) is a global technology leader in positioning and wireless communication in automotive, industrial, and consumer markets. Their smart and reliable solutions, services and products let people, vehicles, and machines determine their precise position and communicate wirelessly over cellular and short range networks. With a broad portfolio of chips, modules, and secure data services and connectivity, u-blox is uniquely positioned to empower its customers to develop innovative and reliable solutions for the Internet of Things, quickly and cost-effectively. With headquarters in Thalwil, Switzerland, the company is globally present with offices in Europe, Asia, and the USA. (www.u-blox.com)
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