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Communication System Architecture Lab
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The lab studies the communication mechanisms and security that underpin the Internet.

AboutAbout the lab
Building and protecting the communication infrastructure behind the Internet.
The Communication System Architecture Lab studies Internet communication technologies and the cybersecurity that protects them.
The lab also works on cloud infrastructure technologies, network virtualization, and the design of the mobile core, the central part of mobile phone networks.
Research proceeds from both theory and practice.
The lab belongs to the Information Security Education and Research Division (SI Center) of the Graduate School of Information Science and Technology, and has bases at the Hongo Campus and the Kashiwa II Campus.
Key terms
- Mobile core
- The central part of a mobile phone network. It verifies users and manages where communications are delivered.
- Network virtualization
- A technology that uses software to build multiple logical networks on top of a single physical network.
- DDoS attack
- An attack that makes a server or network unusable by sending traffic from a large number of devices all at once.
ResearchResearch themes
The lab studies Internet communication technologies, cloud infrastructure technologies, and cybersecurity. Prof. Sekiya is currently putting particular emphasis on cybersecurity and next-generation mobile communications (Beyond 5G).
*Illustrative imageNext-Generation Mobile Core
The lab studies next-generation architectures for the mobile core, the central part of mobile phone networks. In joint research with SoftBank, it is working to realize a secure, stateless mobile core.
*Illustrative imageCyberattack Countermeasures for Networks
Research centers on countermeasures against cyberattacks observed every day, such as DDoS attacks and spoofing attacks. By focusing on the temporal and spatial characteristics of communication, the lab also works on building IoT systems that are resilient to DoS attacks.
*Illustrative imageDistributed Cloud Infrastructure
The lab studies the technologies that underpin the cloud, including management of computing resources, distributed file systems, and network virtualization. It has actually built and operated "WIDE Cloud," a cloud that connects universities and research institutions.
MembersFaculty
The members of the Communication System Architecture Lab consist of faculty, researchers, secretaries, doctoral and master's students, and research students.As of 2026
- ProfessorYuji SekiyaPublications ↗
- Associate ProfessorKunio Akashi
- Associate ProfessorYi Wei
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Racks Amravati Data Center” PiDatacenters / CC BY-SA 4.0 (cropped)
- Next-Generation Mobile Core: “Cell-Tower” J.smith(English Wikipedia) / CC BY-SA 2.5 (cropped)
- Cyberattack Countermeasures for Networks: “Ddos-attack-ex” Nasanbuyn / CC BY-SA 4.0 (cropped)
- Distributed Cloud Infrastructure: “Wikimedia racks ULSFO servers” Mutante / CC BY-SA 3.0 (cropped)
- Related lab (Cryptography and Mathematical Informatics Lab): “Enigma-IMG 0487-black” Rama / CC BY-SA 2.0 fr (cropped)
- Related lab (Systems and Control Lab): “Kilobot robot swarm” asuscreative / CC BY-SA 4.0 (cropped)
- Related lab (Nonlinear Physics Lab): “Vein skeleton of a leaf (de-ghosted)” Brocken Inaglory / CC BY-SA 3.0 (cropped)
- Related lab (Computing Systems Lab (Nakamura-Takase)): “Pleiades two row” NASA Ames Research Center / Public domain (cropped)
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