DCT

2:26-cv-00775

Bayerische Motoren Werke Aktiengesellschaft v. Broadcom Inc

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Complaint
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I. Executive Summary and Procedural Information

  • Parties & Counsel:
  • Case Identification: 2:26-cv-00775, E.D. Tex., 08/31/2026
  • Venue Allegations: Venue is alleged to be proper in the Eastern District of Texas because Defendant BI maintains a regular and established place of business in the district, and because Defendant Avago, as a foreign entity, may be sued in any judicial district.
  • Core Dispute: Plaintiff BMW AG seeks a declaratory judgment that its vehicles do not infringe three U.S. patents owned by Defendants related to automotive Ethernet and Wi-Fi technologies, following a breakdown in license renewal negotiations.
  • Technical Context: The technologies at issue involve wired (Ethernet) and wireless (Wi-Fi) data communication protocols, which are fundamental to modern in-vehicle networks for infotainment, navigation, and advanced driver-assistance systems.
  • Key Procedural History: The complaint states that the parties had a prior patent license agreement, which expired. Subsequent negotiations for a renewal allegedly stalled after Defendants demanded a significantly higher royalty rate. Defendants have accused BMW of infringement in a series of "infringement presentations" and have filed lawsuits in Germany on European counterparts to two of the U.S. patents-in-suit, creating the "actual controversy" required for this declaratory judgment action.

Case Timeline

Date Event
2005-09-30 U.S. Patent No. 7,936,778 Priority Date
2006-09-20 U.S. Patent No. 7,835,389 Priority Date
2006-12-09 U.S. Patent No. 9,137,672 Priority Date
2010-11-16 U.S. Patent No. 7,835,389 Issued
2011-05-03 U.S. Patent No. 7,936,778 Issued
2015-09-15 U.S. Patent No. 9,137,672 Issued
2020-10 BMW AG and Avago enter into a patent license agreement
2025-07 Broadcom writes to BMW AG regarding license renewal
2025-10 Broadcom sends "Broadcom Patent Licensing Proposal" to BMW AG
2026-01 Broadcom sends BMW AG a list of patents, labeling the '778 Patent "Exemplary"
2026-03 Broadcom sends infringement presentation for '389 Patent counterpart
2026-03 Broadcom sends infringement presentation for the '778 Patent
2026-06 Broadcom sends infringement presentation for '672 Patent counterpart
2026-06 Avago sues BMW AG in Germany on European counterpart of '389 Patent
2026-08 Avago sues BMW AG in Germany on European counterpart of '672 Patent
2026-08-31 Complaint for Declaratory Judgment of Noninfringement filed

II. Technology and Patent(s)-in-Suit Analysis

U.S. Patent No. 7,835,389 - "Method and system for an extended range Ethernet line code using 4B/3B mapping"

  • Patent Identification: U.S. Patent No. 7,835,389, titled "Method and system for an extended range Ethernet line code using 4B/3B mapping," issued on November 16, 2010 (the "'389 Patent"). Compl. ¶29

The Invention Explained

  • Problem Addressed: The patent describes the challenge of using high-speed Ethernet over non-ideal communication channels, such as the longer, lower-quality cabling that may be found in automotive environments, which can cause greater signal loss than typical office cabling. ʼ389 Patent, col. 3:23-28
  • The Patented Solution: The invention proposes a method for extending the effective range of Ethernet by reducing the data rate on the physical wire. It achieves this by converting 4-bit data packets (MII data) into more efficient 3-bit packets, which are then mapped to two "ternary" (three-level) signal streams for transmission. '389 Patent, abstract '389 Patent, col. 3:36-41 This line-coding scheme allows for reliable communication over longer or lower-grade twisted-pair cables. ('389 Patent, col. 3:23-41).
  • Technical Importance: This technique makes robust, high-speed Ethernet more practical for cost- and weight-sensitive applications like automotive networking, where signal integrity is a critical concern. Compl. ¶15

Key Claims at a Glance

  • The complaint seeks a declaratory judgment of non-infringement of at least claim 1 of the '389 Patent. Compl. ¶34
  • The essential elements of independent claim 1, a method claim, are:
    • Converting Ethernet media independent interface (MII) data in a local physical layer device from a 4-bit packet stream to one or more data packet portions of one or more ternary bit streams;
    • Mapping 3-bit binary IDLE patterns to one or more IDLE portions of said one or more ternary bit streams;
    • Wherein 3-bit binary IDLE patterns having a least significant bit of zero are mapped to a non-zero value of said one or more ternary bit streams;
    • And 3-bit binary IDLE patterns having a non-zero least significant bit are mapped to a zero value of said one or more ternary bit streams; and
    • Communicating said one or more ternary bit streams to a remote PHY over one or more twisted pairs. Compl. ¶35
  • The complaint does not explicitly reserve the right to assert other claims but seeks a declaration of non-infringement for "any enforceable claim." Compl. Prayer for Relief ¶A

U.S. Patent No. 7,936,778 - "Method and system for 10GBASE-T start-up"

  • Patent Identification: U.S. Patent No. 7,936,778, titled "Method and system for 10GBASE-T start-up," issued on May 3, 2011 (the "'778 Patent"). Compl. ¶30

The Invention Explained

  • Problem Addressed: High-speed Ethernet transceivers require an elaborate "start-up" or "training" procedure to adapt to the specific electrical characteristics of a cable link. This process, involving synchronization, power level adjustments, and echo cancellation, can be computationally intensive and require fast, complex handshaking. '778 Patent, col. 1:52-61
  • The Patented Solution: The patent describes a start-up method where two devices periodically exchange long "PMA training frames." A majority of each frame consists of a known pseudo-random sequence, allowing the receivers to train their equalizers and cancellers. The frames also contain smaller "InfoFields" that are used to exchange control parameters less frequently, relaxing the need for real-time processing of all start-up functions. '778 Patent, abstract '778 Patent, col. 3:1-20
  • Technical Importance: This structured training process provides a robust and flexible framework for establishing a reliable, high-speed communication link by allowing devices to negotiate settings and adapt to the physical medium without requiring all start-up functions to be performed in real-time. '778 Patent, col. 2:1-9

Key Claims at a Glance

  • The complaint seeks a declaratory judgment of non-infringement of at least claim 1 of the '778 Patent. Compl. ¶43
  • The essential elements of independent claim 1, a method claim, are:
    • Exchanging physical medium attachment (PMA) training frames periodically between link partners during a training period;
    • Wherein a majority portion of each of said PMA training frames is comprised of pseudo random known sequences which are used for establishing transceiver operations for communication between said link partners; and
    • Wherein said link partners are communicatively coupled via a wired Ethernet link. Compl. ¶44
  • The complaint does not explicitly reserve the right to assert other claims but seeks a declaration of non-infringement for "any enforceable claim." Compl. Prayer for Relief ¶A

U.S. Patent No. 9,137,672 - "Method and system for coexistence between 20 MHz and 40 MHz overlapping basic service sets (OBSS) in wireless local area networks"

  • Patent Identification: U.S. Patent No. 9,137,672, titled "Method and system for coexistence between 20 MHz and 40 MHz overlapping basic service sets (OBSS) in wireless local area networks," issued on September 15, 2015 (the "'672 Patent"). Compl. ¶31

Technology Synopsis

  • The patent addresses interference in Wi-Fi networks where a newer, high-throughput network using a wide 40 MHz channel overlaps with an older network using a narrower 20 MHz channel. '672 Patent, col. 2:29-44 The invention describes a method where a device in the 40 MHz network can receive a frame from the 20 MHz network and, based on information in that frame (or the absence of certain information), reconfigure itself to use a narrower 20 MHz channel to avoid causing interference. '672 Patent, claim 1

Asserted Claims

  • At least claim 1 is at issue. Compl. ¶52

Accused Features

  • The complaint identifies BMW vehicles that implement a Wi-Fi standard, such as the BMW 5 Series, as the accused instrumentalities. Compl. ¶52

III. The Accused Instrumentality

Product Identification

  • The accused instrumentalities are various BMW AG vehicles, including the BMW 3 Series G20, BMW M3 Type G80, MINI Countryman Type U25, and certain 2025 model year vehicles, as well as the BMW 5 Series. Compl. ¶34 Compl. ¶43 Compl. ¶52

Functionality and Market Context

  • The complaint alleges that Defendants contend these vehicles infringe by implementing industry standards for in-vehicle networking and communications. Specifically, the vehicles are accused of infringing the '389 and '778 patents by implementing the 100BASE-T1 and 1000Base-T1 automotive Ethernet standards, respectively. Compl. ¶34 Compl. ¶43 The vehicles are accused of infringing the '672 Patent by implementing a Wi-Fi standard (e.g., Wi-Fi 5 and Wi-Fi 6). Compl. ¶15 Compl. ¶52 BMW AG is positioned as a global leader in premium and luxury vehicles. Compl. ¶8 BMW's central non-infringement argument is that its implementation of these standards does not require performing the specific methods recited in the patents' claims. Compl. ¶37 Compl. ¶46 Compl. ¶55
  • No probative visual evidence provided in complaint.

IV. Analysis of Infringement Allegations

'389 Patent Infringement Allegations

Claim Element (from Independent Claim 1) Alleged Infringing Functionality Complaint Citation Patent Citation
converting Ethernet media independent interface (MII) data...from a 4-bit packet stream to one or more...ternary bit streams; Plaintiff argues its vehicles, by implementing the 100BASE-T1 standard, do not necessarily perform the claimed 4-bit to ternary stream conversion. ¶37 col. 13:1-9
mapping 3-bit binary IDLE patterns to one or more IDLE portions of said one or more ternary bit streams, Plaintiff argues its vehicles do not perform the specific mapping of 3-bit binary IDLE patterns as recited in the claim. ¶37 col. 13:11-25
wherein 3-bit binary IDLE patterns having a least significant bit of zero are mapped to a non-zero value... Plaintiff denies its products perform this specific mapping rule where an LSB of zero is mapped to a non-zero value. ¶37 col. 13:18-22
and 3-bit binary IDLE patterns having a non-zero least significant bit are mapped to a zero value... Plaintiff denies its products perform this specific mapping rule where a non-zero LSB is mapped to a zero value. ¶37 col. 13:22-25
communicating said one or more ternary bit streams to a remote PHY over one or more twisted pairs. Plaintiff's denial is premised on its argument that the ternary bit streams are not generated according to the preceding claimed steps. ¶37 col. 17:1-4

'778 Patent Infringement Allegations

Claim Element (from Independent Claim 1) Alleged Infringing Functionality Complaint Citation Patent Citation
exchanging physical medium attachment (PMA) training frames periodically between link partners during a training period, Plaintiff argues its vehicles, by implementing the 1000Base-T1 standard, do not necessarily exchange the particular PMA-training frames recited in the claim. ¶46 col. 3:1-4
wherein a majority portion of each of said PMA training frames is comprised of pseudo random known sequences... Plaintiff argues its vehicles' implementation of the relevant standard does not necessarily require that the training frames have this specific composition. ¶46 col. 3:4-9
wherein said link partners are communicatively coupled via a wired Ethernet link. This element describes a basic Ethernet setup; Plaintiff's denial appears to be a blanket denial of infringement of the entire claim. ¶46 col. 1:52-55

Identified Points of Contention

  • Standard Implementation vs. Patented Method: For all asserted patents, a central question will be whether compliance with the relevant industry standard (100BASE-T1, 1000Base-T1, or Wi-Fi) necessarily requires practicing the specific methods recited in the claims. The complaint suggests that the standards may allow for alternative, non-infringing implementations. Compl. ¶37 Compl. ¶46 Compl. ¶55
  • Technical Questions: For the '389 Patent, the dispute raises the question of how BMW's Ethernet implementation actually maps IDLE patterns. For the '778 Patent, the dispute raises the question of what the precise structure and content of the training frames used in BMW's automotive Ethernet systems are.

V. Key Claim Terms for Construction

U.S. Patent No. 7,835,389

  • The Term: "mapping" (in the context of "mapping 3-bit binary IDLE patterns")
  • Context and Importance: The claim recites a very specific, counter-intuitive set of rules for this mapping: IDLE patterns with a least significant bit (LSB) of '0' are mapped to a non-zero value, while those with a non-zero LSB are mapped to a zero value. Compl. ¶35 The case may turn on whether BMW's implementation of the 100BASE-T1 standard performs this exact mapping. Practitioners may focus on this term because the patent's definition appears both highly specific and central to BMW's non-infringement theory. Compl. ¶37
  • Intrinsic Evidence for Interpretation:
    • Evidence for a Broader Interpretation: The complaint does not provide sufficient detail for analysis of this element.
    • Evidence for a Narrower Interpretation: The patent specification provides detailed tables (e.g., Table 2) explicitly defining the mapping of binary IDLE values to ternary values. '389 Patent, col. 14, Table 2 This could be used to argue that the term "mapping" is limited to the specific rules disclosed.

U.S. Patent No. 7,936,778

  • The Term: "PMA training frames"
  • Context and Importance: Claim 1 requires that a "majority portion" of these frames be "comprised of pseudo random known sequences." Compl. ¶44 The infringement analysis will depend on whether the frames exchanged by BMW's systems meet this structural requirement. Practitioners may focus on this term to determine if the frames used in the accused 1000Base-T1 automotive Ethernet standard have the same composition as those defined in the patent.
  • Intrinsic Evidence for Interpretation:
    • Evidence for a Broader Interpretation: The term itself is general, and one could argue that any frame used for Physical Medium Attachment training fits the definition.
    • Evidence for a Narrower Interpretation: The specification provides significant detail on the structure of these frames, describing them as consisting of a "known pseudo random sequence" and a shorter "InfoField" for exchanging parameters. '778 Patent, abstract '778 Patent, FIG. 5 This detailed description could be used to argue for a narrower construction that includes these specific components.

VI. Other Allegations

  • Indirect Infringement: The complaint seeks a declaration of non-infringement under theories of both direct and indirect infringement. Compl. Prayer for Relief ¶A It affirmatively states that BMW is not aware of any employees, customers, or other associated entities using its vehicles in a manner that would infringe the patents-in-suit. Compl. ¶39 Compl. ¶48 Compl. ¶57
  • Willful Infringement: The complaint does not allege willfulness, as it is a DJ action filed by the accused infringer. However, the facts alleged by BMW to establish an "actual controversy"-including Defendants' infringement presentations and prior lawsuits in Germany-also serve to document Defendants' allegations of pre-suit knowledge, which could form the basis of a future willfulness claim by Defendants if they counterclaim for infringement. Compl. ¶¶16-21

VII. Analyst's Conclusion: Key Questions for the Case

  1. Standard Compliance vs. Infringement: A primary issue for the court will be whether BMW's implementation of the 100BASE-T1, 1000Base-T1, and Wi-Fi standards inherently practices the specific methods claimed in the patents-in-suit. The case may hinge on whether the standards mandate the claimed techniques or permit alternative, non-infringing methods.
  2. Claim Scope and Technical Equivalence: The dispute will likely involve a granular comparison of the accused technology to the patent claims. A key question for the '389 patent will be one of definitional scope: does the specific, inverted "mapping" logic for IDLE patterns recited in claim 1 describe an optional or mandatory feature of the 100BASE-T1 standard as implemented by BMW?
  3. Evidentiary Proof of Non-Infringement: As the declaratory judgment plaintiff, BMW bears the burden of proving it does not infringe. A central challenge will be presenting sufficient technical evidence to affirmatively demonstrate that its complex in-vehicle communication systems operate in a way that avoids the methods claimed in Defendants' patents.