Cobblestone Wireless v. AT&T: Carrier Aggregation Patent Dismissed With Prejudice
Cobblestone Wireless asserted US7924802B2 — covering 3GPP carrier aggregation technology — against AT&T Services, AT&T Corp., and AT&T Mobility in the Eastern District of Texas. After 420 days of litigation, the parties jointly moved to dismiss all claims with prejudice, with each side bearing its own costs.
Carrier Aggregation Assertion Against AT&T Ends in With-Prejudice Dismissal
Cobblestone Wireless, LLC — a patent assertion entity — filed suit against AT&T Services, Inc., AT&T Corp., and AT&T Mobility, LLC in the Eastern District of Texas on August 25, 2023, asserting infringement of US7924802B2. The patent relates to 3GPP carrier aggregation technology embodied in cellular base stations, mobile products, and related services. Nokia of America Corporation and Ericsson Inc. intervened in the proceedings, consistent with their roles as infrastructure suppliers whose technology was implicated by the allegations.
The case resolved on October 18, 2024 — 420 days after filing — via a joint motion to dismiss filed by all parties, including the defendant AT&T entities and intervenors Nokia and Ericsson. The court granted the motion and dismissed all claims with prejudice, meaning Cobblestone is permanently barred from re-asserting the same claims against AT&T on the basis of this patent in this matter. Each party was ordered to bear its own costs, attorneys’ fees, and expenses, with no prevailing-party fee award.
The with-prejudice dismissal and cost-neutrality provision are consistent with a confidential settlement, though the public record does not confirm financial terms or any licence grant. The intervention of Nokia and Ericsson — major RAN infrastructure suppliers — suggests the dispute implicated network equipment deployed in AT&T’s mobile network, adding commercial complexity that may have accelerated resolution. Whether Cobblestone has asserted or will assert US7924802B2 against other carriers or equipment vendors remains an open question.
Filing to Dismissed with Prejudice in 420 days
420 days — above the median for E.D. Texas patent cases resolved pre-trial
Dismissed with prejudice: what the joint motion outcome means for both parties
With-prejudice dismissal permanently closes the claim
A dismissal with prejudice under Federal Rule of Civil Procedure 41 operates as a final adjudication on the merits. Cobblestone Wireless cannot re-file the same infringement claims against AT&T Services, AT&T Corp., or AT&T Mobility based on US7924802B2 in connection with this matter. The joint nature of the motion — signed by all parties including intervenors Nokia and Ericsson — signals that the resolution was consensual and comprehensive.
Permanent bar on re-filingCobblestone exits with no public admission of invalidity
Dismissal with prejudice forecloses future claims against AT&T but does not constitute a judicial ruling that US7924802B2 is invalid or unenforceable. Cobblestone retains the patent and may assert it against other defendants. The cost-neutrality clause — each party bears its own fees — is typical of settlements and avoids the reputational stigma of a fee award under 35 U.S.C. § 285. The confidential terms, if any compensation was paid, remain undisclosed.
Patent survives; claims extinguishedAT&T and intervenors achieve certainty, avoid trial risk
AT&T Services, AT&T Corp., and AT&T Mobility, along with intervenors Nokia of America and Ericsson Inc., secured dismissal of all claims without any public finding of infringement. The with-prejudice dismissal gives AT&T and its infrastructure suppliers certainty against further litigation on these specific claims. However, any licence terms — including scope and duration — remain private, creating ongoing ambiguity for third-party observers assessing AT&T’s freedom to operate.
Litigation risk eliminatedCarrier aggregation IP remains live risk for the wireless sector
US7924802B2 survives this litigation intact and without a validity ruling, meaning it can be enforced against other wireless carriers, device OEMs, or equipment vendors deploying 3GPP carrier aggregation. The intervention of Nokia and Ericsson underscores that RAN infrastructure suppliers face direct exposure when carrier aggregation patents are asserted. Other MNOs and handset makers — particularly those not party to any licence obtained by AT&T — should treat this patent as an active enforcement risk.
Patent enforceable vs. third partiesFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Cobblestone Wireless, LLC | Company | Patent assertion entity — holder of US7924802B2 covering 3GPP carrier aggregationSearch in Eureka ↗ |
| Defendant | AT&T Services, Inc. | Company | AT&T Services, AT&T Corp., and AT&T Mobility — U.S. wireless carrier and subsidiariesSearch in Eureka ↗ |
| Co-Defendant | AT&T Corp. | Company | Search in Eureka ↗ |
| Co-Defendant | AT&T Mobility, LLC | Company | Search in Eureka ↗ |
| Plaintiff counsel | Amy Elizabeth Hayden | Attorney | Counsel for Cobblestone Wireless, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Christian W. Conkle | Attorney | Counsel for Cobblestone Wireless, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Jacob Buczko | Attorney | Counsel for Cobblestone Wireless, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Jason Wietholter | Attorney | Counsel for Cobblestone Wireless, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Jonathan Ma | Attorney | Counsel for Cobblestone Wireless, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Marc A. Fenster | Attorney | Counsel for Cobblestone Wireless, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Matthew D. Aichele | Attorney | Counsel for Cobblestone Wireless, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Neil Alan Rubin | Attorney | Counsel for Cobblestone Wireless, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Qi Tong | Attorney | Counsel for Cobblestone Wireless, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Reza Mirzaie | Attorney | Counsel for Cobblestone Wireless, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Russ August & Kabat LLP | Law Firm | Representing Cobblestone Wireless, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Russ August & Kabat LLP (DC) | Law Firm | Representing Cobblestone Wireless, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Russ August & Kabat LLP (Los Angeles) | Law Firm | Representing Cobblestone Wireless, LLCSearch in Eureka ↗ |
| Defendant counsel | Adam Bertram Ahnhut | Attorney | Counsel for AT&T Services, Inc.Search in Eureka ↗ |
| Defendant counsel | David S. Frist | Attorney | Counsel for AT&T Services, Inc.Search in Eureka ↗ |
| Defendant counsel | Emily Chambers Welch | Attorney | Counsel for AT&T Services, Inc.Search in Eureka ↗ |
| Defendant counsel | John Daniel Haynes | Attorney | Counsel for AT&T Services, Inc.Search in Eureka ↗ |
| Defendant counsel | Sloane Sueanne Kyrazis | Attorney | Counsel for AT&T Services, Inc.Search in Eureka ↗ |
| Defendant law firm | Alston & Bird LLP (Atlanta) | Law Firm | Representing AT&T Services, Inc.Search in Eureka ↗ |
| Defendant law firm | Alston & Bird LLP (Dallas) | Law Firm | Representing AT&T Services, Inc.Search in Eureka ↗ |
| Presiding judge | Judge N/A | Judge | Texas Eastern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The court’s order adopts the parties’ joint motion verbatim, granting dismissal with prejudice of all claims between Cobblestone Wireless and the AT&T defendants, as well as intervenors Nokia and Ericsson. The phrase ‘the above-captioned case has been resolved’ in the motion — without specifying the nature of resolution — is consistent with a confidential settlement. No findings of fact, claim construction, or validity rulings were issued, leaving US7924802B2 legally intact and enforceable against third parties who were not party to this dismissal.
US7924802B2 — 3GPP Carrier Aggregation for Cellular Networks
US7924802B2, filed as application US12/018370, covers technology relating to 3GPP carrier aggregation — a core LTE-Advanced and 5G NR feature that enables mobile devices and base stations to simultaneously transmit and receive data across multiple frequency bands, increasing throughput and spectral efficiency. The patent’s application date places it in the early LTE-Advanced standardisation period, when carrier aggregation was transitioning from specification to commercial deployment. Its claims are asserted against cellular base stations, mobile handsets, and the network services that implement 3GPP carrier aggregation protocols.
Carrier aggregation is now fundamental to LTE and 5G NR deployments globally, making US7924802B2 potentially relevant to a wide range of commercial actors — wireless carriers, RAN infrastructure vendors, and device OEMs. The involvement of Nokia and Ericsson as intervenors in this case suggests the patent’s claims may read on standard network equipment, raising standard-essential patent considerations. Any company manufacturing or deploying 3GPP-compliant carrier aggregation equipment in the United States should assess exposure against this patent, particularly given that no invalidity ruling has been issued.
Should you run an FTO against US7924802B2?
If your organisation designs, manufactures, or deploys 3GPP carrier aggregation technology — including LTE-Advanced base stations, 5G NR radio access equipment, or multi-band capable mobile devices — US7924802B2 warrants direct FTO analysis. Cobblestone has demonstrated willingness to pursue major carriers and implicate infrastructure suppliers through intervenor proceedings. Non-AT&T carriers, handset OEMs, and neutral host operators deploying carrier aggregation in the U.S. market are potential enforcement targets.
PatSnap Eureka’s FTO Search Agent can map claim language from US7924802B2 against your product specifications and flag overlapping prior art that may support an IPR petition or design-around strategy. Eureka’s standard-essential patent analysis tools can also help assess whether any FRAND obligations attach to the claims — a critical question given the 3GPP context and the roles of Nokia and Ericsson in this litigation.
Run a freedom-to-operate analysis on US7924802B2 to assess your product’s exposure
Run FTO in Eureka →Similar 3GPP Carrier Aggregation Patent Cases in E.D. Texas
Explore related patent infringement actions involving 3GPP and LTE carrier aggregation technology litigated in the Eastern District of Texas.
What this case signals for the wireless carrier aggregation IP landscape
A with-prejudice settlement involving AT&T and two major RAN suppliers sends clear signals about carrier aggregation patent risk.
Carrier aggregation patents are high-value targets in E.D. Texas
Cobblestone’s choice of the Eastern District of Texas — a plaintiff-friendly venue — and its assertion against AT&T entities collectively reflects a coordinated enforcement strategy. Companies with 3GPP carrier aggregation deployments should monitor Cobblestone’s broader docket for parallel assertions against other carriers or equipment suppliers.
Infrastructure supplier intervention signals equipment-level exposure
Nokia and Ericsson’s intervention confirms that RAN equipment manufacturers face direct litigation exposure when carriers are sued over network functionality. Suppliers of 5G and LTE base station equipment should assess indemnification obligations and freedom-to-operate positions for carrier aggregation implementations as a matter of routine IP hygiene.
Cobblestone v AT&T — key questions answered
The case was dismissed with prejudice on October 18, 2024, pursuant to a joint motion filed by Cobblestone Wireless, the AT&T defendants, and intervenors Nokia and Ericsson. Each party bears its own costs. No merits ruling was issued on infringement or validity of US7924802B2.
Cobblestone Wireless asserted US7924802B2 (application number US12/018370), which covers 3GPP carrier aggregation technology as implemented in cellular base stations, mobile products, and related services, including Apple mobile products as cited in the complaint.
The public record does not specify the basis for Nokia and Ericsson’s intervention. However, intervention by RAN infrastructure suppliers in carrier-level patent suits typically occurs when asserted claims read on network equipment supplied by those vendors, triggering indemnification or direct infringement exposure. Both companies are named in the joint dismissal motion.
No. A dismissal with prejudice bars Cobblestone from re-asserting the same claims against the AT&T defendants in this matter, but it does not constitute a ruling on the validity or enforceability of US7924802B2. The patent remains in force and can be asserted against other parties not covered by this dismissal.
A mutual cost-bearing provision means neither side was awarded attorneys’ fees or litigation expenses. This is common in patent cases resolved by settlement and does not indicate which party obtained more favourable terms in any confidential agreement. It avoids a fee-shifting ruling under 35 U.S.C. § 285, which would require a finding of an ‘exceptional case’.
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