Filing in this corpus is concentrated at the top of the assignee ranking, with a small number of large telecom and automotive electronics firms accounting for a disproportionate share of the 2,351 families tracked. That said, momentum has shifted: several of the largest historical filers, including LG Electronics, Huawei, Samsung and Toyota, recorded zero filings in the most recent full year, while the current volume leader is itself down 60% year-on-year. Ranking by cumulative count and ranking by recent activity point to different companies, so it matters which question you're actually asking.

No — filing peaked in 2019 at 436 records and has declined since, with the 2022 midpoint already down to 318. Because publication lags filing by roughly 18 months, the final one to two years in any dataset understate true activity, but the multi-year decline from the 2019 peak predates that lag and reflects a genuine slowdown rather than a reporting artefact. This pattern is typical of a field where core claim territory has been substantially staked and standardisation work has matured.

The overwhelming majority of records, 2,212 out of 2,351, touch IPC subclass H04W for wireless communication networks, with H04L (digital information transmission) and G08G (traffic control systems) as secondary but still substantial categories. Smaller overlaps appear in B60W (vehicle control), G01S (radar and positioning), G06F (data processing) and G07C (checking devices) — these peripheral classes are where V2X claims intersect with vehicle dynamics, sensor fusion and access control, and tend to carry lower filing density.

US20190110177A1, filed by LG Electronics and published in April 2019, claims a method for a V2X terminal to select a communication resource that satisfies a defined latency requirement, then perform the V2X communication using that resource. The claim ties resource selection directly to a latency bound rather than claiming latency reduction generally, which narrows its scope but also makes it a frequently cited reference point for anyone drafting resource-selection claims in cellular V2X. It is one of several highly cited records in this corpus built around the same resource-selection-under-latency-constraint claim shape.

The IPC composition data shows security credential management, DSRC-to-cellular-V2X coexistence, and roadside-unit hardware architecture all carry materially lower record counts than the core wireless-networking claims that dominate the corpus. Radar-assisted positioning fusion and joint vehicle-control message sets, which overlap with G01S and B60W respectively, also show thinner coverage relative to H04W. These are not guaranteed to be free of prior art, but they are the branches where filing density is lowest relative to the technology's overall footprint, making them worth a dedicated freedom-to-operate check before committing to a claim strategy there.