Communications Expert Witness for Patent Litigation
Dr. Tal Lavian is a telecommunications expert witness and internet expert witness with a Ph.D. from UC Berkeley. He spent nearly 20 years researching, studying, and lecturing at UC Berkeley, specializing in telecommunications, network communication, and Internet technologies. He applies this academic and industrial research background to his consulting work.
His patent and case work spans computer networks, data communications, LAN/WAN, TCP/IP, UDP, VPN, VoIP, streaming media, chat, SMS, mobile wireless, Ethernet, routing, switching, Internet, and web techs. Dr. Lavian offers expert services in patent cases, including testimony, expert reports, and patent analysis of Internet techs, standards, and protocols.
Dr. Lavian has testified before judges, juries, and PTAB panels, presenting technical material in terms understandable by both technical and non-technical audiences.
Dr. Lavian has testified in Federal courts before judges and juries, the USPTO PTAB, and the ITC. He has served as an expert on over 100 patents litigated in network communications and telecommunications, including Internet Protocols (TCP/IP), streaming media, and mobile technologies. Cases involved companies including Apple, Google, Microsoft, Samsung, Meta (Facebook), Amazon, Cisco Systems, AT&T, Verizon, T-Mobile, Juniper Networks (HPE), Huawei, Arista, Motorola, LG, Avaya, and many others.
Dr. Lavian has experience working with law firms, providing patent analysis, prior art, source code reviews, hardware reviews, patent infringement, patent invalidity, trade secrets, and other related matters.
Therefore, he has testified as an expert witness over 80 times in depositions and trials and has written numerous expert reports. These reports comprise technical research and analysis regarding patent claims, invalidity/validity, infringement/non-infringement, claim constructions, and prior art.
Dr. Lavian presents technical material in plain English common sense and uses terminology understandable by technical and lay audiences alike.
Expert testimony services and litigation support, including:
- Dr. Lavian provides expert testimony and litigation support services, including:
- Testifying as an expert in cases filed with the United States District Court, the United States Patent and Trademark Office (USPTO), the International Trade Commission (ITC), and other courts in the United States, the Tax Court in Canada, and a court in Asia.
- Serving as an expert in USPTO PTAB proceedings, including Inter partes reviews (IPRs), Covered Business Method (CBM) reviews, Post Grant Reviews (PGRs), Ex-Parte Re-Examinations, and PTO Interferences.
- Providing technical education for claim constructions and Markman hearings.
- Writing expert reports, including analyses, claim term definitions, and claim construction.
- Communicating technical information effectively to audiences of varying levels of technical expertise.
- Providing product and technical analyses related to patent portfolios, claim charts, prior art investigation, and patentability research.
Examples of past expert witness cases:
- Web reservation over the Internet covering multiple reservation instances.
- Network management patents.
- Telecommunications architecture, PSTN, and VoIP.
- Network protocol for multimedia application.
- Web services and Internet tech patents.
- Router switching fabric architecture and Ethernet pseudo-wire VPN patents.
- Multiprotocol telecom routing optimization.
- Multiprotocol label switching (MPLS) Tech.
- Wireless and communications access control.
- Bluetooth, KVM switch architectures.
- Wireless Tech, Wi-Fi 802.11 a/b/n, MIMO.
- Wi-Fi tethering in broadband cellular data.
- Mobile wireless products and technologies.
- Web reservation over the Internet covering multiple reservation instances.
- Wireless techs, Wi-Fi, 802.11, WLAN.
- VoIP, cellphone, short messages, and chat app patents.
- Instant VoIP communication using mobile devices.
- Improving communication between mobile devices and base stations.
- Network communications, routing, and switching Tech investigation.
- MPLS Tunneling patents, IETF RFCs standards for MPLS.
- Operational Support System (OSS), SNMP, and Device Management.
- Network management for IP-PBX. Internet Protocols, TCP/IP, Network Management, SNMP.
- Routing, switching, and communication equipment architectures and design.
- Network communications, routing, and switching techniques.
- Multi-protocol telecom routing optimization.
- MPLS Routing, Packet Switching, Queuing.
- Internet protocols, routing and switching.
- Web services and Internet techs. Internet protocols, routing, and switching.
- Routing switching, network communications, TCP/IP VoIP, short message service, SMS, and chat apps patents.
- iPhone, iPad, and other Apple mobile wireless products.
- Firewall and secure multimedia communications.
- Cases of online reservations.
- Video conference application programs.
Expert Services
- Dr. Lavian provides expert testimony and technical education for claim constructions and Markman hearings in patent cases involving network communications and telecommunications. He explains protocol implementations, system architectures, and standards compliance to judges, juries, and PTAB panels.
- Dr. Lavian has written expert reports for over 50 law firms and corporate clients. These reports include technical analyses of accused products and prior art, definitions of claim terms grounded in industry standards (IETF RFCs, IEEE specifications), and claim construction opinions supported by his 120+ patents and published research.
- Dr. Lavian has been retained by both plaintiffs and defendants. His services include expert reports, deposition testimony, trial testimony, source code review, hardware analysis, prior art investigation, and patent portfolio evaluation in telecommunications and networking matters.
Communications and Network Technologies Expertise
PSTN, VoIP & Cellular Systems
Telecom Systems & Protocols
Dr. Lavian has provided testimony in patent cases involving PSTN circuit switching, SS7 signaling, VoIP protocols (SIP, RTP, H.323), and cellular systems including 3G, 4G LTE, and 5G architectures. He served as Principal Scientist at Nortel Networks, where he led telecommunications system design and was Principal Investigator for three DARPA projects. As a telecommunications expert witness, he has analyzed telecom infrastructure patents covering transmission systems, switching architectures, and signaling protocols.
Network Communications Expert
Network Communications
Dr. Lavian holds a Ph.D. from UC Berkeley specializing in network communications and has invented over 120 patents in networking technologies including TCP/IP, routing protocols, switching architectures, and network management systems. As a network communications expert witness, he has been retained in cases involving packet switching, protocol stack implementations, network interface designs, and quality of service mechanisms for companies including Cisco, Google, and Microsoft.
Computer Networks Expert
Computer Networks
Dr. Lavian has worked on LAN and WAN architectures throughout his career at Nortel Networks and at UC Berkeley, where he conducted research in data center networking (RAD Labs) and network service architectures (SAHARA). As a computer networks expert witness, he has analyzed patent claims involving Ethernet, IEEE 802.3, client-server architectures, cloud computing infrastructure, and distributed computing systems.
Internet Protocols Expert
Internet Protocols
Dr. Lavian has testified in patent cases involving TCP/IP protocol stacks, UDP, IPv4/IPv6, DNS, DHCP, ARP, and HTTP implementations. His patents cover Internet protocol innovations including packet processing, protocol negotiation, and network layer addressing. As an internet protocols expert witness, he has analyzed source code and hardware implementations against IETF RFC standards in disputes before federal courts and the PTAB.
Internet and Web Expert
Internet and Web
Dr. Lavian has been retained in patent cases involving web services, HTTP-based applications, web reservation systems, and Internet architecture. His case history includes disputes over online reservation technologies, web-based communication platforms, and Internet application protocols. As an internet and web expert witness, he has prepared expert reports analyzing claim construction for web technology patents.
Routing and Switching Expert
Routing and Switching
Dr. Lavian has provided testimony in patent disputes involving MPLS tunneling, BGP route advertisements, OSPF implementations, and L2/L3 switching architectures. At Nortel Networks, he designed router and switch architectures, including switching fabric systems and packet queuing mechanisms. As a routing and switching expert witness, he has analyzed routing protocol implementations, Ethernet pseudo-wire VPN patents, and multiprotocol routing optimization patents.
Voice Over IP (VoIP) Expert
Voice Over IP (VoIP)
Dr. Lavian has testified in patent cases involving VoIP protocols including SIP, RTP, RTCP, H.323, and MGCP, as well as IP telephony systems, VoIP gateways, and instant VoIP communication on mobile devices. His patent portfolio includes inventions in voice and multimedia communication systems. As a VoIP expert witness, he has analyzed VoIP system architectures, jitter handling, packet loss mitigation, and call signaling implementations.
Mobile Wireless Expert
Mobile Wireless
Dr. Lavian has been retained in patent cases involving Wi-Fi (802.11 a/b/n), WLAN, Bluetooth, MIMO, Wi-Fi tethering, and cellular technologies (3G, 4G LTE, 5G, CDMA, GSM). His case history includes disputes over Apple iPhone and iPad wireless products, mobile device base station communication, and SMS/chat application patents. As a mobile wireless expert witness, he conducted wireless systems research at UC Berkeley (ICEBERG project) and holds patents in mobile wireless technologies.
Streaming Media Expert
Streaming Media
Dr. Lavian has testified in patent cases involving video and audio streaming protocols, multimedia conferencing applications, and real-time media delivery systems. His case history includes disputes over video conference application programs and streaming media network protocols. As a streaming media expert witness, he has analyzed RTP/RTCP implementations, codec architectures, and media streaming system designs in patent litigation.
Network Systems Expert
Network Systems
Dr. Lavian designed network systems at Nortel Networks as Principal Scientist (1996–2007) and conducted network service architecture research at UC Berkeley (SAHARA project). His patent portfolio includes inventions in network device architectures, system configurations, and network infrastructure designs. As a network systems expert witness, he has analyzed network system patents involving routers, switches, gateways, load balancers, and content switches.
LAN/WAN Expert
LAN/WAN Technologies
Dr. Lavian has testified in cases involving LAN technologies (IEEE 802.1, 802.3, Ethernet) and WAN architectures including VPN, MPLS, and SONET/SDH. His work at Nortel Networks included LAN/WAN product design and development. As a LAN/WAN expert witness, he has analyzed patent claims covering wired and wireless LAN implementations, WAN tunneling protocols, and enterprise network architectures.
Cloud Computing Expert
Cloud Computing
Dr. Lavian conducted data center research at UC Berkeley (RAD Labs) and has patent claims involving cloud infrastructure, client-server architectures, and distributed computing systems. As a cloud computing expert witness, he has provided testimony in cases involving cloud service architectures, virtual networking, security groups, access control lists, and network load balancing in cloud environments.
Cellular Technology Expert
Cellular Technology
Dr. Lavian has been retained in patent cases involving cellular technologies from 2G through 5G, including CDMA, GSM, LTE, and RAN architectures. His case history includes disputes over mobile device communication with base stations and broadband cellular data tethering. As a cellular technology expert witness, he has analyzed cellular protocol implementations, MAC/PHY layer designs, and mobile wireless system patents.
Web Technologies and Applications Expert
Web Technologies and Applications
Dr. Lavian has testified in patent cases involving web services, Internet applications, HTTP protocols, and web-based reservation systems. His patents include inventions in web application architectures and Internet communication systems. As a web technologies and applications expert witness, he has analyzed client-server web architectures, application-layer protocols, and web service implementations in patent disputes.
Internet Technology Patents Expert
Internet Technology Patents
Dr. Lavian is an inventor of over 120 patents in Internet and networking technologies. He has served as an expert on over 100 patents litigated and has analyzed over 200 patents. He has prepared claim charts, prior art analyses, and infringement/non-infringement opinions for Internet technology patent disputes. As an Internet technology patent expert witness, he has written expert reports on patent validity, claim construction, and technical implementations for cases in federal courts, the PTAB, and the ITC.
Networks and Protocols Expert
Networks and Protocols
Dr. Lavian has testified on underlay network architectures, protocol stack implementations across OSI layers 1–7, and standards from IETF, IEEE, and ITU-T. His patent portfolio covers network protocol innovations at the datalink, network, and transport layers. As a networks and protocols expert witness, he has analyzed protocol compliance, network layer interoperability, and standards-essential patent claims in litigation.
Telecommunication and Network Management Expert
Telecommunication and Network Management
Dr. Lavian has been retained in patent cases involving network management systems (NMS), SNMP-based device management, IP-PBX management, and Operational Support Systems (OSS). His case history includes disputes over network monitoring, configuration management, and FCAPS implementations. As a telecommunication and network management expert witness, he has analyzed NMS architectures, MIB structures, and SNMP protocol implementations in patent litigation.
Messaging and Chat Expert
Messaging and Chat Technologies
Messaging and chat technologies — including SMS, MMS, instant messaging (IM), and modern chat applications — have become universal methods of communication across billions of mobile devices worldwide. Dr. Lavian’s work covers the protocols, architectures, and software systems that enable these messaging platforms, from traditional short message services to real-time chat applications and their integration with broader communications systems. As a messaging and chat expert witness, he provides detailed technical analysis of messaging protocols, application architectures, and the interoperability of messaging systems in patent litigation and intellectual property disputes.
Frequently Asked Questions: Communications Expert Witness
What services does Dr. Lavian provide?
Dr. Lavian provides expert services in telecommunications, network communications, Internet protocols, VoIP, network security, streaming media, computer networking, data communications, mobile wireless, routing and switching, network management, and messaging technologies. He delivers expert reports, deposition testimony, trial testimony, claim construction analysis, and technical tutorials for legal teams.
What qualifications does Dr. Lavian have as an expert witness?
Dr. Lavian has spent nearly 20 years researching, studying, and lecturing at UC Berkeley. He holds a Ph.D. in Computer Science from UC Berkeley specializing in network communications, has invented over 120 patents in telecommunications and networking, and has been retained in more than 70 engagements. He is an IEEE Senior Member with 25+ peer-reviewed publications and over 35 years of experience in telecommunications research and development.
In what courts has Dr. Lavian testified?
Dr. Lavian has testified in U.S. federal district courts across multiple jurisdictions, the USPTO Patent Trial and Appeal Board (PTAB) in IPR and PGR proceedings, the International Trade Commission (ITC) in Section 337 investigations, the Tax Court in Canada, and a court in Asia in patent litigation involving Apple. He has given over 80 depositions and has testified at trial before judges and juries.
What types of cases require a communications expert witness?
A communications expert witness is needed in patent infringement litigation involving telecom and networking technologies, ITC Section 337 investigations, USPTO PTAB inter partes reviews (IPRs) and post-grant reviews (PGRs), trade secret disputes involving network protocols or communications systems, and breach of contract matters with technical telecommunications components.
How does Dr. Lavian prepare expert reports?
Dr. Lavian's methodology includes reviewing the patent claims and prosecution history, analyzing accused products or prior art through documentation and source code review, constructing claim charts mapping claim limitations to technical implementations, and preparing detailed written reports with clear technical explanations suitable for judges, juries, and PTAB panels.
What companies and law firms has Dr. Lavian been retained in cases involving?
Dr. Lavian has been retained in telecommunications patent cases involving major technology companies including Apple, Google, Microsoft, Samsung, Meta (Facebook), Amazon, Cisco Systems, AT&T, Verizon, T-Mobile, Juniper Networks (HPE), Huawei, Arista Networks, Motorola, LG, Avaya, and many others. He has been engaged by law firms including Fish & Richardson, Kirkland & Ellis, Gibson Dunn, Skadden, Finnegan, Irell & Manella, Perkins Coie, Morgan Lewis, Baker Botts, and many more.
For inquiries, contact Dr. Lavian at +1 (408) 209-9112 or via the contact page.