Alexander Resources GSM Experts and Consultants
Product and Technology Analysis, Expert Witness,

Patent Infringement and Validity,
and Litigation Support Services

(Global System for Mobile communications)

Our work in GSM technologies, networks and standards began in 1995. This work has included technical analysis, expert witness engagements, patent analysis projects, seminars and research reports. As a result, we have developed an in-depth knowledge and understanding of nearly every facet of GSM. This includes:

  • GSM Network Technologies, Architectures & Standards
    • Network functions, protocols, interfaces, signalling and messages for:
      • Core Network (CN)/Network Subsystem (NSS) network element
      • Radio Access Network (RAN)/Access Network (AN) network elements
      • Authentication, Authorization and Accounting (AAA)
      • Channels: Physical, Logical, Traffic, Control and Transport
      • Handover and handoff
      • Mobility Management
      • Network interconnection and interworking
      • Packet and circuit switching
      • Security
      • Telecom management
      • User, Control and Network planes
    • Air & Radio interfaces, protocols, stacks, modulation, encoding, signalling and messages for:
      • Frequency Division Duplex (FDD)
      • Frequency Division Multiple Access (FDMA)
      • Time Division Multiple Access (TDMA)
  • GSM Terminals & Phones
    • Architecture, functions, Operating Systems/OS, text input, SIM cards, activation, registration, authorization, Graphical User Interfaces (GUI), Web browsers, filters and access control
  • GSM Applications & Services
    • Messaging: Email, SMS, EMS, voice mail, text/instant messaging, ringtones, ringback tones, and answer tones
    • Systems, methods, practices, standards and technologies used to manage, store, generate, send, and receive voice, text, MMS and SMS messages
  • GSM LoCation Services (LCS) and Positioning methods (/locating methods)
  • GSM Billing and Charging Systems including usage information (Charging Data Records - CDR), call event, usage collection, rating, charging, accounting and billing

Our Litigation Support Services in GSM include Product and Technology Analysis, Patent Analysis and Expert Witness Services. Previous GSM engagements have addressed:

  • Technology, system, standards, network, and product analysis (from a technical, functional, & market/industry and competitive perspective)
  • Product defects, quality, warranty and repair issues
  • Patent analysis & research
    • Technical review and analysis of patent claims, preparation of claims charts and validity and infringement opinions
    • Defend and counter claims of infringement
    • Identify infringing patents and products
    • Identify infringing technical standards and the systems that incorporate these standards
    • Entire market value rule (EMVR) analysis
    • Product value apportionment analysis
    • Patentability Evaluations
    • Portfolio Analysis
  • Business management, practices & operations
    • Contracts
    • Royalty calculations & payments
    • Supplier agreements
    • Sales, marketing and distribution agreements
      • Dealer and distributor relationships and agreements
    • Purchase orders and purchase agreements
  • Confidentiality of trade secrets, customer lists, business plans, new & proprietary products and services
  • GSM technology and product licensing and agreements
    • Joint development agreements
    • Product development agreements
      • Product specifications
For additional information see: Patent Analysis and Expert Witness Services

Other expert and consulting services focus on:
Cell Phones
Cell Phone Records, Billing and Usage
Mobile Phones
Radio Spectrum
Telephone Consumer Protection Act (TCPA)

Our Litigation Support Services are headed by Mr. Jerry Kaufman, the president of Alexander Resources. In addition to managing all engagements, he directly manages the research and production of all expert reports, analysis, and testimony. He personally testifies at trial and depositions.

Please refer to Mr. Kaufman's biography for additional information on his background and capabilities.

For a confidential review of your requirements, please contact Carol Smyth at 972-818-8225 or via e-mail at

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