GNSS Timing Holdover Patents: Leaders, Trends & White Space 2026
A data-backed view of GNSS timing holdover patents: who leads filings, how fast the field grew, where technology clusters, and where the claim space is still open.
Filing growth = 2021 (2 records) → 2024 (18); 2024 is the last year we treat as complete. Top-5 share = the 5 largest assignees ÷ all 158 records in scope (CR5), not the ranked leaders only.
What this landscape covers
GNSS timing holdover is the problem of keeping a network clock accurate for a defined interval after satellite reference signals are jammed, spoofed or simply lost. It sits at the intersection of positioning hardware (oscillators, phase-locked loops, drift compensation) and network synchronization protocols that depend on that clock staying within tolerance. The 158 records in scope span claims from local-oscillator drift monitoring through to network-level holdover management in cellular and vehicle-to-vehicle systems.
Filing activity was sparse before 2021 and accelerated sharply through 2023, the peak year so far at 26 published records. Because publication trails filing by roughly 18 months, the most recent years in any trend understate real filing activity rather than signal a slowdown.
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Filing trend and technology composition
Two views of the same 158 records: how filing activity moved year over year, and which IPC subclasses the claims actually sit in.
A field that went from occasional to active
Published filings held at low single digits through the late 2010s, then rose from 2 records in 2021 to 18 in 2024 — an 800% increase over that span, with 2023 the peak year so far at 26 records. Treat 2025 and 2026 figures as still filling in rather than a declining trend.
Publication lags filing by roughly 18 months, so 2025 onwards are still filling in. Growth rates on this page therefore end at 2024; running them to the last bar would understate the field.
Wireless and positioning classes carry the claims
H04W (wireless communication networks) appears on 41.8% of the 158 records and G01S (radar, sonar & positioning) on 31.6%, confirming that holdover is claimed mainly as a network-timing problem with a positioning-hardware backbone. H04B, H04J and H04L each cover a meaningful minority of records, while G04R (radio-controlled timepieces), B60R (vehicle systems) and F02D (engine control) are present but thin — under 11% each.
Shares are the percentage of the 158 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Network Timing & Synchronization: GNSS Timing Holdover Patent Landscape with Eureka
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Try EurekaThe most-cited prior art in this field
US20170214516A1 — System and method for managing holdover
A system for managing holdover built around a local oscillator, a phase-locked loop (PLL) drawing a reference clock signal from an external source, and a drift monitoring device that measures oscillator drift by comparing the PLL's extracted clock signal against the local oscillator's own signal. A drift compensation device acts on that measurement to keep the clock within tolerance once the reference signal is unavailable.Filed by Ciena Corporation, published 2017-07-27 — one of the earliest records in scope to claim holdover as a discrete, managed system rather than an incidental PLL behaviour.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5379320A | Hitless ultra small aperture terminal satellite communication network | 210 |
| 2 | US20090143018A1 | Automated Configuration of a Wireless Location System | 91 |
| 3 | US20170214516A1 | System and method for managing holdover | 72 |
| 4 | WO2017027355A1 | Methods, apparatus and systems for realizing vehicle to vehicle communications using long term evolution devi… | 58 |
| 5 | US20120069943A1 | Base station and clock synchronization method thereof | 57 |
| 6 | US20030012158A1 | System and method for synchronizing a base station in a distributed radio system | 49 |
| 7 | US6725157B1 | Indoor GPS clock | 40 |
| 8 | US20090278616A1 | Method and system for correcting oscillator frequency drift | 33 |
| 9 | US20180196142A1 | Method and apparatus for providing secure timing and position synchronization from GNSS | 27 |
| 10 | US6879913B1 | Indoor GPS clock | 26 |
Citation counts reflect an older-skews-higher bias inherent to any searched corpus — treat them as a marker of influence on later filings, not of present-day importance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three readings of the same dataset, aimed at where to file, who to watch, and what's still open.
The top of the ranking moves fast
The top 5 assignees hold 46.8% of all 158 records and the top 10 hold 66.5%, against a ranked field of 62 companies. A leader position (22 records) sits well above fifth place (8) and tenth place (5), so the gap between committing early and joining late is wide.
A niche that only recently became active
Published filings rose from 2 in 2021 to 18 in 2024, an 800% increase, with 2023 the busiest year so far at 26 records. That trajectory reflects holdover being claimed as its own subject rather than folded into broader GNSS-timing claims.
Network claims dominate over timepiece hardware
H04W and G01S together cover the bulk of records, meaning most claims frame holdover as a wireless-network or positioning problem. G04R (radio-controlled timepieces), B60R (vehicle systems) and F02D (engine control) sit in single-digit-to-low-double-digit territory, marking automotive and standalone-timepiece framings as thinner ground.
US and Europe lead, India and PCT close behind
The United States leads receiving-office counts at 42, ahead of the EPO at 27 and India at 21; WIPO/PCT filings (18) and South Korea (14) show meaningful multi-jurisdiction strategy among the more active filers.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to network timing & synchronization: gnss timing holdover patent landscape, with the prior art for and against each one.
Where to take this next
The dataset points to concrete follow-up questions rather than a finished picture.
Track the concentration as 2025–2026 records fill in
Because publication lags filing, the current leader board and the 800% growth figure will both shift as recent filings surface. Re-running this landscape in six to twelve months will show whether the top 10's 66.5% share holds or erodes as new entrants publish.
Explore filing trends in EurekaMap the under-claimed branches in detail
G04R, B60R and F02D each sit under 11% of records, thin enough to be worth a claim-by-claim read rather than a top-line share. Automotive and standalone-timepiece holdover implementations look comparatively open relative to the wireless and positioning core.
Run a white-space search in EurekaCheck freedom-to-operate against the most-cited records
The five most-cited documents in this set, led by US5379320A at 210 citations, anchor a large share of downstream claims. Any new filing in drift compensation or holdover management should be checked against this citation cluster before drafting.
Pull citation maps in EurekaCommon questions on GNSS timing holdover patents
In this dataset, a record qualifies if it claims maintaining clock or timing accuracy using GNSS, GPS or satellite-navigation references combined with holdover, hold-over, or signal-loss handling — either in the claim text directly or as a core part of the described system. That includes local-oscillator drift monitoring and compensation, phase-locked-loop designs referencing a satellite clock source, and network-level protocols for managing timing when satellite signal is unavailable. It excludes GNSS positioning patents that do not address what happens to timing accuracy when the signal drops.
Published records rose from 2 in 2021 to 18 in 2024, an 800% increase, with 2023 the peak year so far at 26 records. That timing lines up with wider deployment of 5G network synchronization requirements and growing concern over GNSS jamming and spoofing, both of which push holdover from an incidental PLL behaviour into its own claimed subject matter. Because publication lags filing by around 18 months, the true 2024–2026 filing volume is likely higher than what has published so far.
Wireless communication networks (H04W) appear on 41.8% of the 158 records in scope and radar/positioning (G01S) on 31.6%, making these the two dominant framings. Transmission (H04B), multiplex communication (H04J) and digital information transmission (H04L) each cover a meaningful minority of records, reflecting holdover's role inside broader network-timing protocols. Vehicle systems (B60R) and engine control (F02D) are present but each cover under 4% of records, marking automotive holdover as a comparatively thin area.
The ranked field covers 62 companies, and the top 5 combined hold 46.8% of all 158 records while the top 10 hold 66.5%. The leader alone accounts for 22 records against 8 at fifth place and 5 at tenth, so the drop-off from the very top is steep. That pattern suggests a small group of committed filers rather than broad, even participation across the field.
The Ciena Corporation filing, published 2017-07-27, claims a holdover system built from a local oscillator, a phase-locked loop drawing a reference clock signal, a drift monitoring device that measures oscillator drift by comparing the PLL's extracted signal against the local oscillator's own output, and a drift compensation device acting on that measurement. It is cited 72 times within this corpus, making it one of the more influential records on later holdover-management filings. Whether it blocks a new design depends on whether the new system uses the same drift-monitoring-then-compensation architecture or a materially different approach to detecting and correcting oscillator drift.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.