UMTS: Alive and Well - 4G Americas

USIM / AuCUE / HSSUE / ASMEKCK, IKK ASMEK NASencK NASintK eNBUE / MMEK UPencK RRCintK RRCencUE / eNBFigure C.6. Key Hierarchy in EPS. 179C.2.1.6.3.2TRAFFIC PROTECTIONSecurity termination points for various traffic types terminating at the terminal are shown in Figure C.7.With the user plane encryption in EPS being placed in eNodeB, system security has to be handled morecarefully compared to UMTS. Different deployment environments may call for different implementation –specific security solutions to provide the appropriate level of security. As an example of an eNodeBimplementation, the radio interface encryption and S1 interface encryption could be integrated on thesame Integrated Circuit. While there are several potential implementations, 3GPP has decided at thisstage not to focus on a specific implementation technology in order to allow for future evolution in securitytechnology. The aim is to have a single set of high level security requirements for all types of eNodeBs.179 Ericsson. Q2 2007.www.3GAmericas.org February 2010 Page 154