Harald Welte presented this talk at the 28C3 Chaos Communication Congress in Berlin. While we use packet oriented transmissions daily over cellular networks, unlike TCP/IP and Ethernet many even in the hacker community are not familiar with the actual protocol stacks for those cellular packet networks. The purpose of this talk is to give an in-depth explanation of the structure of the lower layer protocols used in packet data services on cellular networks.
The Osmocom OpenBSC project mentioned in this talk is a project aiming to create a Free Software, (A)GPL-licensed software implementations for the GSM/3GPP protocol stacks and elements. For more information visit the Osmocom OpenBSC website.