Operation Subsystem
n The OSS (Operation Subsystem) enables centralized
operation, management, and maintenance of all GSM
subsystems
n Components
Authentication Center (AUC)
n generates user specific authentication parameters on request of a VLR
n authentication parameters used for authentication of mobile terminals
and encryption of user data on the air interface within the GSM
system
Equipment Identity Register (EIR)
n registers GSM mobile stations and user rights
n stolen or malfunctioning mobile stations can be locked and sometimes
even localized
Operation and Maintenance Center (OMC)
n different control capabilities for the radio subsystem and the network
subsystem