Morris Routing Tech LLC v. T-Mobile USA Inc

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: Morris Routing Technologies, LLC (Texas)
  • Defendant: T-Mobile USA, Inc. (Delaware)
  • Plaintiff’s Counsel: Devlin Law Firm LLC; Andrew Gordon Law Firm PLLC
• Case Identification: 4:24-cv-00625, E.D. Tex., 10/04/2024
• Venue Allegations: Venue is alleged to be proper in the Eastern District of Texas because T-Mobile maintains regular and established places of business, including numerous retail stores and corporate offices, within the district. Plaintiff also notes that T-Mobile has not contested venue in other recent patent cases in the district.
• Core Dispute: Plaintiff alleges that Defendant’s 4G and 5G wireless networks, which utilize segment routing (SR) technology, infringe a portfolio of ten U.S. patents related to methods and systems for network routing.
• Technical Context: The patents relate to segment-based routing (SR), a network technology that directs data packets using a path encoded within the packet’s header, which simplifies network management and is considered a key enabling technology for 5G networks.
• Key Procedural History: This is a First Amended Complaint, filed to add U.S. Patent No. 12,058,042, which issued after the filing of the initial complaint. No other significant procedural events are mentioned.

Case Timeline

Date	Event
2014-05-09	Earliest Priority Date for all Patents-in-Suit
2019-02-19	U.S. Patent No. 10,212,076 Issues
2019-08-06	U.S. Patent No. 10,374,938 Issues
2019-08-27	U.S. Patent No. 10,397,100 Issues
2019-09-03	U.S. Patent No. 10,404,583 Issues
2020-03-10	U.S. Patent No. 10,587,505 Issues
2020-07-07	U.S. Patent No. 10,708,168 Issues
2020-09-22	U.S. Patent No. 10,785,143 Issues
2021-01-01	U.S. Patent No. 10,904,144 Issues
2021-05-18	U.S. Patent No. 11,012,344 Issues
2024-08-06	U.S. Patent No. 12,058,042 Issues
2024-10-04	First Amended Complaint Filing Date

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

U.S. Patent No. 10,212,076 - “ROUTING METHODS, SYSTEMS, AND COMPUTER PROGRAM PRODUCTS FOR MAPPING A NODE-SCOPE SPECIFIC IDENTIFIER,” Issued February 19, 2019

The Invention Explained

• Problem Addressed: The patent describes the limitations of traditional Internet Protocol routing, where distinctions between names, addresses, and routes created complexity and latency (Compl. ¶¶21-22; ’076 Patent, col. 1:55-2:41). Conventional IP/MPLS networking required nodes to maintain extensive state information, which led to scalability problems (Compl. ¶¶21-22).
• The Patented Solution: The invention discloses techniques for mapping a "node-scope specific identifier" from one node's identifier space to another's ('076 Patent, abstract). This allows a data packet to carry network path information that can be interpreted locally by each node along a path, enabling the data to be forwarded without requiring each node to maintain global state information for the entire path (Compl. ¶24; ’076 Patent, col. 3:4-21).
• Technical Importance: This approach simplifies network architecture and enhances scalability, which is critical for managing the complex traffic engineering demands of modern networks like 5G (Compl. ¶¶27-28).

Key Claims at a Glance

• The complaint asserts at least independent claim 1 (Compl. ¶72).
• Claim 1 (Method):
  • receiving network path information for transmitting data along a network path, based on a node-scope specific identifier in a node-specific identifier space of a first node;
  • the identifier identifying, for the first node, a particular node in the network path;
  • determining a node-scope specific identifier in a node-specific identifier space of a second node that identifies, for the second node, the particular node;
  • mapping the identifier from the first node's space to the identifier in the second node's space; and
  • transmitting the data from the current node along the path including the particular node.
• The complaint reserves the right to assert additional claims (Compl. ¶73).

U.S. Patent No. 10,374,938 - “ROUTING METHODS, SYSTEMS, AND COMPUTER PROGRAM PRODUCTS,” Issued August 6, 2019

The Invention Explained

• Problem Addressed: The patent identifies the complexity and scalability problems of prior art traffic engineering, which relied on distributed control planes and hop-by-hop forwarding decisions (Compl. ¶21; '938 Patent, col. 1:54-2:39). Maintaining per-flow state information across network nodes was inefficient (Compl. ¶24).
• The Patented Solution: The invention describes segment-based routing, where a source node chooses a path and encodes it in the packet header as a sequence of identifiers ("segments") ('938 Patent, abstract; Compl. ¶24). These segments, which can be MPLS labels or IPv6 addresses, instruct subsequent nodes on how to forward the packet, removing the need for intermediate routers to maintain per-flow state (Compl. ¶¶24-25; '938 Patent, col. 19:18-21:7).
• Technical Importance: This source-routing paradigm, known as Segment Routing (SR), dramatically reduces the amount of state information required in network nodes, simplifies the control plane, and enables advanced features like network slicing and service chaining, which are foundational to 5G network architecture (Compl. ¶¶33, 36).

Key Claims at a Glance

• The complaint asserts at least independent claim 15 (Compl. ¶80).
• Claim 15 (Method):
  • detecting, by a current node, data in a data unit specified according to a network protocol that includes a first path-based protocol address with a plurality of path segment identifiers for a path from a source to a destination node;
  • detecting, based on the current location, a current-next path segment identifier;
  • determining, based on the current-next path segment identifier, a current-next network interface in the current-next path segment; and
  • sending, via the current-next network interface, the data to the next node.
• The complaint reserves the right to assert additional claims (Compl. ¶81).

U.S. Patent No. 10,397,100 - “ROUTING METHODS, SYSTEMS, AND COMPUTER PROGRAM PRODUCTS USING A REGION SCOPED OUTSIDE-SCOPE IDENTIFIER,” Issued August 27, 2019

• Technology Synopsis: This patent addresses routing data between different network regions ("scopes"). It describes using a "region scoped outside-scope identifier" that allows a node in one region to identify a node in another region without needing a globally unique address, thereby improving routing efficiency across network boundaries.
• Asserted Claims: At least independent claim 1 (Compl. ¶88).
• Accused Features: The T-Mobile Networks are alleged to use this technology to manage routing across different network segments or slices (Compl. ¶¶67, 88).

U.S. Patent No. 10,404,583 - “ROUTING METHODS, SYSTEMS, AND COMPUTER PROGRAM PRODUCTS USING MULTIPLE OUTSIDE-SCOPE IDENTIFIERS,” Issued September 3, 2019

• Technology Synopsis: This patent expands on the concept of routing between network regions. It discloses methods for using multiple "outside-scope identifiers" within a single packet, allowing for the creation of more complex and flexible inter-region routing paths.
• Asserted Claims: At least independent claim 1 (Compl. ¶96).
• Accused Features: The T-Mobile Networks are accused of infringing by implementing complex routing policies, such as for service chaining or network slicing, that span multiple network domains (Compl. ¶¶67, 96).

U.S. Patent No. 10,587,505 - “ROUTING METHODS, SYSTEMS, AND COMPUTER PROGRAM PRODUCTS,” Issued March 10, 2020

• Technology Synopsis: This patent describes methods for routing packets based on path information included in the packet itself. It focuses on the processing steps taken by a network node to receive a packet, identify the next hop from path data in the header, and forward the packet accordingly, consistent with the principles of segment routing.
• Asserted Claims: At least independent claim 1 (Compl. ¶104).
• Accused Features: The general segment routing functionality of the T-Mobile Networks is accused of practicing the claimed methods (Compl. ¶¶67, 104).

U.S. Patent No. 10,708,168 - “ROUTING METHODS, SYSTEMS, AND COMPUTER PROGRAM PRODUCTS,” Issued July 7, 2020

• Technology Synopsis: This patent continues to build on segment routing concepts, detailing the methods by which a network node processes a packet containing a sequence of path segments. It describes how a node uses a segment identifier to determine the next hop and forwards the packet, a core function of SR-MPLS and SRv6 data planes.
• Asserted Claims: At least independent claim 1 (Compl. ¶112).
• Accused Features: The T-Mobile Networks' implementation of SR-MPLS and SRv6 is alleged to infringe (Compl. ¶¶67, 112).

U.S. Patent No. 10,785,143 - “ROUTING METHODS, SYSTEMS, AND COMPUTER PROGRAM PRODUCTS,” Issued September 22, 2020

• Technology Synopsis: This patent describes routing methods involving path-based protocol addresses. It focuses on the logic used by a network node to determine a path to a destination and encode that path information into a packet, a key function of a source or ingress node in a segment routing architecture.
• Asserted Claims: At least independent claim 6 (Compl. ¶120).
• Accused Features: The SR-capable ingress and headend routers within the T-Mobile Networks are alleged to infringe (Compl. ¶¶67, 120).

U.S. Patent No. 10,904,144 - “METHODS, SYSTEMS, AND COMPUTER PROGRAM PRODUCTS FOR ASSOCIATING A NAME WITH A NETWORK PATH,” Issued January 1, 2021

• Technology Synopsis: This patent discloses a system for associating a symbolic name (like a hostname) with a specific network path. It describes a topology service that can resolve a name not just to an address, but to a sequence of hops or segments that define a path, enabling named-based traffic engineering.
• Asserted Claims: At least independent claim 1 (Compl. ¶128).
• Accused Features: T-Mobile's implementation of SR Policies, which can be associated with names or services, is accused of infringing (Compl. ¶¶67, 128).

U.S. Patent No. 11,012,344 - “ROUTING METHODS, SYSTEMS, AND COMPUTER PROGRAM PRODUCTS,” Issued May 18, 2021

• Technology Synopsis: This patent details fundamental processing steps within a segment routing node. It describes detecting a packet with a path-based address, identifying the next segment, determining the corresponding network interface, and sending the packet, which are the core functions of a transit node in an SR network.
• Asserted Claims: At least independent claim 1 (Compl. ¶136).
• Accused Features: The SR-capable transit routers in the T-Mobile Networks are alleged to practice the claimed methods (Compl. ¶¶67, 136).

U.S. Patent No. 12,058,042 - “ROUTING METHODS, SYSTEMS, AND COMPUTER PROGRAM PRODUCTS,” Issued August 6, 2024

• Technology Synopsis: This patent, the most recently issued, describes methods for a topology node to generate and provide path information. It covers identifying sequences of identifiers for data routing and combining them based on a policy to create a constrained path, a key function of a central SR controller (PCE).
• Asserted Claims: At least independent claim 1 (Compl. ¶144).
• Accused Features: The central controllers and management systems for T-Mobile's SR-enabled networks are accused of infringing (Compl. ¶¶67, 144).

III. The Accused Instrumentality

Product Identification

The accused instrumentalities are T-Mobile's networks, including its wireless, fixed wireless, and fiber networks, which operate under brands such as "T-Mobile," "T-Mobile Fiber," and "Metro" (Compl. ¶62). These networks are alleged to include 5G stand-alone networks and support functionality specified in the Segment Routing (SR) RFCs (Compl. ¶¶62, 67).

Functionality and Market Context

The complaint alleges that T-Mobile's networks support and use segment routing, including both SR-MPLS and SRv6, to manage data traffic (Compl. ¶¶64-66). This technology is described as a key enabler for 5G, particularly for features like network slicing and service chaining (Compl. ¶33). The complaint alleges T-Mobile uses this technology to provide its 4G and 5G wireless services, and includes a screenshot of T-Mobile's "4G & 5G Coverage map" as evidence of these services being offered in the district (Compl. ¶12; Compl. p. 5). The complaint also highlights that T-Mobile was part of a multi-billion dollar Department of Defense contract that required network slicing capabilities (Compl. ¶33).

IV. Analysis of Infringement Allegations

The complaint references but does not include claim chart exhibits for the asserted patents (Compl. ¶¶73, 81). The infringement allegations are therefore summarized in prose based on the narrative of the complaint.

'076 and '938 Patents Infringement Allegations

The complaint alleges that T-Mobile's networks, referred to as the "Accused Instrumentalities," directly infringe at least claim 1 of the '076 patent and claim 15 of the '938 patent (Compl. ¶¶72, 80). The infringement theory is that T-Mobile's networks, by supporting and utilizing segment routing (SR-MPLS and SRv6), necessarily practice the methods claimed in the patents (Compl. ¶¶64-67). These methods relate to the core functionality of segment routing, such as encoding path information in a packet header and having network nodes process these packets based on segment identifiers (Compl. ¶¶24-25). The complaint alleges these acts of infringement occur when T-Mobile makes, uses, sells, imports, or provides the accused networks (Compl. ¶¶72, 80). As evidence for the availability and use of these networks, the complaint provides a map from T-Mobile's website showing its corporate offices in Frisco, Texas, within the district (Compl. ¶13; Compl. p. 5).

Identified Points of Contention

• Scope Questions: A primary point of contention may be whether T-Mobile's implementation of industry-standard SR protocols falls within the specific claim language of the patents. For the '076 patent, this raises the question of whether the segment identifiers used in SR-MPLS or SRv6 function as a "node-scope specific identifier" that is "mapped" in the manner required by claim 1. For the '938 patent, the dispute may center on whether a list of segment identifiers in a packet header constitutes a "path-based protocol address" as that term is defined and used in the patent.
• Technical Questions: The complaint alleges infringement based on the accused networks supporting SR RFCs (Compl. ¶67). An evidentiary question for the court will be what specific functions T-Mobile's network equipment actually performs and whether those functions meet each limitation of the asserted claims. The complaint's infringement analysis is described as "necessarily preliminary" pending discovery, indicating that the specific operational details of the accused networks are a central open question (Compl. ¶¶73, 81).

V. Key Claim Terms for Construction

• The Term: "node-scope specific identifier" ('076 Patent, Claim 1)

• Context and Importance: This term is central to the '076 patent's claimed invention. The case may turn on whether the Segment Identifiers (SIDs) used in T-Mobile's alleged SRv6 and SR-MPLS networks meet the patent's definition of this term. Practitioners may focus on this term because its construction will determine if standardized SR implementations are within the scope of the claims.

• Intrinsic Evidence for Interpretation:

  • Evidence for a Broader Interpretation: The specification states that a node-scope specific address "operates as an identifier of a node...when processed in the context of the specific node" ('076 Patent, col. 11:42-52). This language could support an interpretation covering any identifier that has local significance to a particular router.
  • Evidence for a Narrower Interpretation: The abstract describes a specific process of receiving information based on an identifier, determining a new identifier for a second node, and explicitly "mapping" the first to the second ('076 Patent, abstract). This may support a narrower construction requiring an explicit, multi-step mapping function, potentially beyond what is performed for a standard SR SID.

• The Term: "path-based protocol address" (from '938 Patent, Claim 15)

• Context and Importance: This term defines the core data structure that the claimed method operates on. The infringement analysis will depend on whether the list of MPLS labels or SRv6 segment identifiers in the accused T-Mobile network packets constitutes a "path-based protocol address" as construed by the court.

• Intrinsic Evidence for Interpretation:

  • Evidence for a Broader Interpretation: The patent states that the term "refers to a protocol address for a network protocol that includes one or more path segment identifiers that identify one or more respective portions of a network path" ('938 Patent, col. 9:56-62). This could be read broadly to encompass any address format that contains path information, such as a standard SR header.
  • Evidence for a Narrower Interpretation: The patent's detailed description and figures illustrate specific structures for these addresses, including address separator fields and various portions for previous and next addresses (e.g., '938 Patent, Figs. 6A-6E; '938 Patent, col. 21:8-32). A defendant may argue that the term should be limited to these specific disclosed structures, which may differ from the format of a standard SR-MPLS label stack or SRv6 segment list.

VI. Other Allegations

• Indirect Infringement: The complaint does not plead a separate count for indirect infringement. However, the direct infringement counts allege that T-Mobile infringes by "providing and causing to be used the Accused Instrumentalities" (Compl. ¶¶72, 80). The complaint further alleges T-Mobile procures and deploys network equipment from vendors (Compl. ¶17), advertises its network services (Compl. ¶12), and supports network slicing for customers (Compl. ¶33), facts that may be used to support a theory of induced infringement.
• Willful Infringement: The complaint does not contain an explicit allegation of willful infringement. It does, however, request a declaration that the case is "exceptional" under 35 U.S.C. § 285 and seeks an award of attorneys' fees (Compl., Prayer for Relief ¶C).

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

• A core issue will be one of definitional scope: can the patents’ specific terminology, such as "node-scope specific identifier" and "path-based protocol address", be construed to read on the structures and identifiers (e.g., SIDs, MPLS labels) used in the industry-standard Segment Routing (SR-MPLS and SRv6) protocols that T-Mobile allegedly implements? The outcome will likely depend on whether the patented inventions are found to be coextensive with, or distinct from, these widely adopted standards.
• A central evidentiary question will be one of technical implementation: pending discovery, what are the precise operational details of T-Mobile's network routers and controllers? The case will turn on whether the factual evidence shows that the accused networks perform the specific "mapping," "detecting," and "determining" steps as required by the patent claims, or if there is a fundamental mismatch in technical operation.
• A further question concerns the relationship among the patents: given the large number of asserted patents with significant conceptual overlap and shared specifications, the court may focus on how the claims of each patent are patentably distinct and whether infringement of one necessarily implies infringement of others, which will be critical for shaping discovery and potential damages calculations.