Research in Networking


142: ROHC's Capstone

10 years ago, on March 13, 2000, the IETF created a working group to create standards on RObust Header Compression (ROHC), enabling the use of Voice over IP (VoIP) on modern cellular networks. Just a year later, RFC 3095 was completed; it solved the most pressing efficiency requirements for sending small packets such as speech frames over IP. However, the ROHC saga went on for a full decade, creating companion standards that once and for all quashed the remaining excuse for not using IP for all types of communication: header overhead.

Of the 33 RFCs created by ROHC, the last three are now published: RFCs 5856, 5857, 5858. Together, they enable ROHCoIPsec: using ROHC header compression over highly secure tunnels created with the IPsec protocol. The Internet Assigned Numbers Authority (IANA) has even allocated one of the coveted IP protocol numbers (of which there are only 256, with little hope of creating another set) to ROHCoIPsec: number 142.

TZI is proud to have helped initiating the success story ROHC, to have provided significant technical contributions as well as a Working Group Chair for most of the time the WG was active, and of course to have provided guidance and a co-author in this final set of ROHC standards.


RFC 5740: Standard transport protocol for reliable multicast

The new RFC 5740 defines the Internet Standard for the reliable delivery of data of data to multiple recipients (NACK-oriented reliable multicast, NORM), fulfilling a similar role as TCP has for unicast (point-to-point connections via the Internet).  RFC 5740 is the 21st Internet RFC authored or co-authored at TZI.


Wireless Embedded Internet: The Book

After a decade of mostly pure research on sensor nets, we are entering a new phase: Sensor networks and the Internet get connected.

The most important standard for this is 6lowpan, IPv6 over Low-Power Area Networks. Up to now, only the RFCs and Internet-Drafts were available. The new book by Zach Shelby (Sensinode) and Carsten Bormann (TZI) gives the whole picture, from the specific standards and drafts up to applications and deployment scenarios.

Update: The book is now available.

New student project: FIDIUS

An important element of the teaching programs at the Universität Bremen are the Student Projects, (mostly) two-year efforts where a group of 10—20 students spends significant time on solving a specific problem, using and advancing the state of the art. AG-RN usually starts a new project every even-numbered year. However, student interest in information security is so high that an additional project has been created this year.

The FIDIUS project is a joint project between AG-KI and AG-RN. About 25 students (organized into two sub-projects) will start working on solving information security problems with Intelligent Systems methods in October 2009. FIDIUS is inspired by the FIDeS project, a major German initiative to apply Intelligent Systems methods to network security.