DCT
2:26-cv-00764
Sol IP LLC v. Honda Motor Co Ltd
Key Events
Complaint
Table of Contents
complaint Intelligence
I. Executive Summary and Procedural Information
- Parties & Counsel:
- Plaintiff: Sol IP, LLC (Virginia)
- Defendant: Honda Motor Co., Ltd. (Japan)
- Plaintiff's Counsel: Nelson Bumgardner Conroy PC
- Case Identification: 2:26-cv-00764, E.D. Tex., 08/28/2026
- Venue Allegations: Plaintiff alleges venue is proper because Defendant is a foreign corporation, which may be sued in any judicial district. The complaint further alleges that Defendant places its products into the stream of commerce with the expectation that they will be purchased by consumers in the Eastern District of Texas, and that Defendant maintains commercial relationships with authorized dealerships within the district.
- Core Dispute: Plaintiff alleges that Defendant's vehicles equipped with Wi-Fi functionality compliant with the IEEE 802.11ac standard infringe two patents related to methods for transmitting and receiving data in Multiple-Input Multiple-Output (MIMO) wireless systems.
- Technical Context: The technology at issue concerns the structure and transmission of control signals in advanced Wi-Fi systems, designed to manage data transmission efficiently across different bandwidths and to multiple users simultaneously.
- Key Procedural History: The complaint alleges that Plaintiff sent Defendant notice letters on June 7, 2021, identifying the asserted patents and accusing Defendant's Wi-Fi-capable products of infringement, more than five years before filing the instant complaint.
Case Timeline
| Date | Event |
|---|---|
| 2010-03-11 | '894 Patent Priority Date |
| 2010-03-12 | '067 Patent Priority Date |
| 2018-02-20 | U.S. Patent No. 9,900,067 Issues |
| 2018-10-02 | U.S. Patent No. 10,090,894 Issues |
| 2021-06-07 | Plaintiff sends pre-suit notice letters to Defendant |
| 2024-01-01 | Approximate launch period for 2024 model year vehicles |
| 2026-08-28 | Complaint Filing Date |
II. Technology and Patent(s)-in-Suit Analysis
U.S. Patent No. 9,900,067 - "Method And Apparatus For Transmitting And Receiving Data In A Mimo System"
- Patent Identification: U.S. Patent No. 9,900,067, "Method And Apparatus For Transmitting And Receiving Data In A Mimo System", issued February 20, 2018 (the "'067 Patent").
The Invention Explained
- Problem Addressed: The patent's background describes that in advanced Multi-User Multiple-Input Multiple-Output (MU-MIMO) wireless systems, there are two types of signal fields: a "common" field for all users and a "dedicated" field for a specific user Compl. ¶1 '067 Patent, col. 2:1-4 The dedicated signal field, however, cannot obtain the same signal-to-noise ratio (SNR) and frequency diversity gains as the common field, making its transmission less robust '067 Patent, col. 2:16-20
- The Patented Solution: The invention proposes a method to more effectively transmit this dedicated signal field. The solution involves "iteratively generating a signal field according to a frequency band applied to transmission of a data frame" '067 Patent, col. 2:41-44 A key aspect of this solution is that the structure and bit-length of the dedicated signal field (VHT-SIG B) change depending on the transmission bandwidth (e.g., 20 MHz, 40 MHz, 80 MHz), which improves transmission performance and efficiency '067 Patent, abstract '067 Patent, Fig. 45
- Technical Importance: This adaptive signaling approach enables more reliable and efficient control information delivery in high-throughput Wi-Fi systems that operate across wider and more varied channel bandwidths.
Key Claims at a Glance
- The complaint asserts at least independent claim 38 Compl. ¶61
- Claim 38 of the '067 Patent recites a communication device with a processor and memory configured to:
- transmit a first control field over a first frequency band, with the bandwidth being a multiple of 20 MHz;
- transmit a second control field over the same frequency band;
- wherein the second control field comprises a first indicator for user data length, a reserved bit portion, and a tail bit portion; and
- wherein the number of bits for the first indicator is smaller when the frequency band is 40 MHz than when it is larger than 40 MHz.
- The complaint does not explicitly reserve the right to assert dependent claims for this patent.
U.S. Patent No. 10,090,894 - "Method And Apparatus For Transceiving Data In A Mimo System"
- Patent Identification: U.S. Patent No. 10,090,894, "Method And Apparatus For Transceiving Data In A Mimo System", issued October 2, 2018 (the "'894 Patent").
The Invention Explained
- Problem Addressed: The patent addresses the challenge in MU-MIMO systems where multiple frames of different lengths are transmitted simultaneously to different users '894 Patent, col. 4:48-51 A method was needed to inform each individual user about the specific end-point of their particular data frame to enable proper decoding '894 Patent, col. 4:51-54
- The Patented Solution: The patent discloses a specific data frame structure and transmission sequence. The frame includes a common signal field (VHT-SIG A), a training field, a user-specific signal field (VHT-SIG B), a service field, and a data unit, all transmitted in a defined order '894 Patent, Fig. 4 The invention specifies that the VHT-SIG B field contains bits indicating the length of the data unit, while the service field contains bits for a scrambler and a cyclic redundancy check (CRC), providing a complete and robust signaling mechanism for each user '894 Patent, claim 7
- Technical Importance: This defined frame format provides a standardized and reliable method for managing user-specific data packets in complex, high-throughput multi-user Wi-Fi environments.
Key Claims at a Glance
- The complaint asserts at least independent claim 7 Compl. ¶81
- Claim 7 of the '894 Patent recites an apparatus (station) with a processor and memory configured to:
- generate a VHT-SIG A field, a VHT-SIG B field, a service field, and a data unit;
- transmit the fields in a specific sequence: VHT-SIG A, then a training field, then VHT-SIG B, then the service field, and finally the data unit;
- wherein the VHT-SIG B field includes bits relating to the length of the data unit and tail bits; and
- wherein the service field comprises bits relating to a scrambler and CRC bits.
- The complaint does not explicitly reserve the right to assert dependent claims for this patent.
III. The Accused Instrumentality
Product Identification
- The "Accused Instrumentalities" are identified as Honda and Acura branded vehicles and infotainment units that are compliant with the IEEE 802.11ac Wi-Fi standard Compl. ¶44 Compl. ¶50 This includes a wide range of models such as the HR-V, CR-V, Pilot, Civic, and Accord, among others Compl. ¶50
Functionality and Market Context
- The complaint alleges that the accused Wi-Fi functionality is used to enable features such as Wireless Apple CarPlay, Wireless Android Auto, in-vehicle Wi-Fi hotspots, and over-the-air software updates Compl. ¶¶45-48
- The complaint provides visual evidence from the Wi-Fi Alliance website, showing certifications for Honda products named "Display Audio-HM CDC" and "Car Navigation System-HM ICB" that confirm compliance with the IEEE 802.11ac standard Compl. ¶49 The certification screenshot indicates the devices are compliant with "Wi-Fi CERTIFIED™ ac" and operate in the 2.4 GHz and 5 GHz bands Compl. pg 18
- The complaint explicitly carves out any products to the extent their Wi-Fi functionality is implemented using components supplied by LG Electronics Inc. or Samsung Electronics Co., Ltd. Compl. ¶50
IV. Analysis of Infringement Allegations
The complaint's infringement theory is premised on the allegation that the Accused Instrumentalities comply with the IEEE 802.11ac standard, and that this compliance necessitates practicing the claimed inventions Compl. ¶65 Compl. ¶85
'067 Patent Infringement Allegations
| Claim Element (from Independent Claim 38) | Alleged Infringing Functionality | Complaint Citation | Patent Citation |
|---|---|---|---|
| transmit a first control field over a first frequency band, a bandwidth of the first frequency band being a multiple of 20 MHz. | The accused devices transmit a Very High-Throughput Signal A (VHT-SIG A) field over a frequency band of 20, 40, 80, 160, or 80+80 MHz, consistent with IEEE 802.11ac. | ¶66 | col. 15:36-44 |
| transmit a second control field over the first frequency band... | The accused devices transmit a Very High-Throughput Signal B (VHT-SIG B) field over the same frequency band as the VHT-SIG A field. | ¶67 | col. 15:45-50 |
| wherein the second control field comprises a first indicator indicating a length of subsequent user data, a reserved bit portion subsequent to the first indicator and a tail bit portion subsequent to the reserved bit portion... | The VHT-SIG B field in the accused devices comprises a VHT-SIG B length field (the first indicator), a reserved field, and a tail field, as specified in the IEEE 802.11ac standard. | ¶67 | col. 13:1-10 |
| and wherein a number of bits comprising the first indicator when the first frequency band is 40 MHz is smaller than a number of bits comprising the first indicator when the first frequency band is larger than 40 MHz. | The complaint alleges that in the accused 802.11ac-compliant devices, the VHT-SIG B length field has fewer bits when the frequency band is 40 MHz than when it is larger than 40 MHz. | ¶67 | col. 12:47-65 |
'894 Patent Infringement Allegations
| Claim Element (from Independent Claim 7) | Alleged Infringing Functionality | Complaint Citation | Patent Citation |
|---|---|---|---|
| cause the apparatus to generate a Very High Throughput-Signal A (VHT-SIG A) field. | The accused devices are configured to generate a VHT-SIG A field as part of their 802.11ac operation. | ¶86 | col. 5:21-25 |
| cause the apparatus to generate a Very High Throughput-Signal B (VHT-SIG B) field. | The accused devices are configured to generate a VHT-SIG B field as part of their 802.11ac operation. | ¶87 | col. 5:21-25 |
| cause the apparatus to transmit the VHT-SIG A field. | The accused devices transmit the generated VHT-SIG A field. | ¶90 | col. 7:15-18 |
| cause the apparatus to transmit a training field after transmitting the VHT-SIG A field. | The accused devices transmit VHT training symbols (a training field) after the VHT-SIG A field. | ¶91 | col. 7:15-18 |
| cause the apparatus to transmit the VHT-SIG B field after transmitting the training field. | The accused devices transmit the VHT-SIG B field after the training symbols. | ¶92 | col. 7:15-18 |
| cause the apparatus to transmit the service field after transmitting the VHT-SIG B field. | The accused devices transmit the service field after the VHT-SIG B field. | ¶93 | col. 7:10-18 |
| cause the apparatus to transmit the data unit after transmitting the service field... | The accused devices transmit a physical layer service data unit (PSDU) after the service field. | ¶94 | col. 7:10-14 |
| wherein: the VHT-SIG B field includes bits relating to a length of the data unit and tail bits; and the service field comprises bits relating to a scrambler and cyclic redundancy check (CRC) bits. | The complaint alleges the VHT-SIG B field includes a length field for the PSDU and tail bits, and the service field includes a scrambler initialization field and a CRC field, per the IEEE 802.11ac standard. | ¶94 | col. 8:29-49 |
Identified Points of Contention
- Scope Questions: The infringement allegations for both patents hinge on the assertion that compliance with the IEEE 802.11ac standard is coextensive with practicing the claims. A primary point of contention may be whether the standard requires the specific structures and relationships claimed, or whether it allows for non-infringing alternative implementations.
- Technical Questions: For the '067 Patent, a question is whether the accused devices' length indicator always has fewer bits at 40 MHz than at >40 MHz, as claimed, or if this is merely one possible configuration under the standard. For the '894 Patent, a question will be whether the accused devices, in all relevant operating modes, strictly adhere to the multi-step generation and transmission sequence recited in claim 7.
V. Key Claim Terms for Construction
The Term: "a number of bits comprising the first indicator when the first frequency band is 40 MHz is smaller than a number of bits comprising the first indicator when the first frequency band is larger than 40 MHz" ('067 Patent, claim 38)
- Context and Importance: This limitation defines the core technical feature of claim 38: an adaptive bit-length for the data length indicator that scales with bandwidth. Practitioners may focus on this term because infringement depends entirely on whether this specific relationship is a mandatory and practiced feature of the accused devices' 802.11ac implementation.
- Intrinsic Evidence for Interpretation:
- Evidence for a Broader Interpretation: The claim language itself is functional and does not specify exact bit counts, which may support an interpretation that covers any implementation exhibiting this "smaller than" relationship, regardless of the specific numbers.
- Evidence for a Narrower Interpretation: The specification provides concrete examples, such as a 17-bit length for 40 MHz and a 19-bit length for 80 MHz '067 Patent, Fig. 45 '067 Patent, col. 12:47-65 A party might argue that the claim scope should be understood in light of these specific disclosed embodiments.
The Term: "service field" '894 Patent, claim 7
- Context and Importance: Claim 7 requires that the "service field comprises bits relating to a scrambler and cyclic redundancy check (CRC) bits." The definition of "service field" and what it must contain is critical. The case may turn on whether the field identified by the plaintiff in the accused devices' transmissions meets this complete definition.
- Intrinsic Evidence for Interpretation:
- Evidence for a Broader Interpretation: The patent does not appear to provide an explicit definition of "service field" separate from its components. A party could argue that any field performing the functions described and containing the required bits qualifies, regardless of its name in the 802.11ac standard.
- Evidence for a Narrower Interpretation: The patent specification illustrates the service field in a particular context within the VHT-DATA portion of a frame '894 Patent, Fig. 5 A party could argue that the term should be limited to the specific structure and context shown, for example, in Figure 8, which depicts a 32-bit service field containing a scrambler seed, user length, and CRC '894 Patent, Fig. 8 '894 Patent, col. 8:40-49
VI. Other Allegations
- Indirect Infringement: The complaint alleges inducement of infringement by asserting that Honda provides instructions, user manuals, and marketing that encourage end-users and dealerships to use the infringing Wi-Fi capabilities (e.g., connecting to Wireless CarPlay) Compl. ¶¶69-70 Compl. ¶¶96-97 Contributory infringement is alleged on the basis that Honda provides proprietary hardware and software components that are a material part of the invention and are not staple articles of commerce suitable for substantial non-infringing use Compl. ¶72 Compl. ¶99
- Willful Infringement: The willfulness allegations are based on both pre-suit and post-suit knowledge of infringement. The complaint alleges that Honda had actual notice of the asserted patents and its infringement at least as early as June 7, 2021, via notice letters sent by Sol IP Compl. ¶73 Compl. ¶100 The complaint asserts that Defendant's continued infringement after receiving this notice has been deliberate and willful Compl. ¶74 Compl. ¶101
VII. Analyst's Conclusion: Key Questions for the Case
- A central legal question will be one of standard conformance versus claim scope: Does compliance with the mandatory features of the IEEE 802.11ac standard, as alleged for the accused vehicles, necessarily require practicing every element of the asserted claims, or does the standard provide for non-infringing alternatives that the accused devices might use?
- A key evidentiary question will be one of functional and structural fidelity: Does the evidence show that the accused devices' Wi-Fi systems consistently and necessarily implement the specific adaptive bit-length relationship of '067 claim 38 and the precise multi-step transmission sequence of '894 claim 7 in their normal modes of operation?
- A pivotal issue for damages will be willfulness: Given that Plaintiff alleges providing specific notice of the asserted patents and infringement theories more than five years before filing suit, the court will examine whether Defendant's continued manufacturing and sales after that date rise to the level of egregious conduct required for a finding of willful infringement and potential enhanced damages.
Analysis metadata