FIELD: radio engineering, communication.
SUBSTANCE: invention relates to a method for transitioning security context from a UTRAN/GERAN-based serving network to an E-UTRAN-based serving network. The technical result is providing transitioning of security context from a serving network of a first type to a serving network of a second type. In the method, a remote station generates first and second session keys in accordance with security context using a count (COUNT) and first security context root key associated with a UTRAN/GERAN-based serving network. The remote station receives a first message from the E-UTRAN-based serving network. The first message signals to the remote station to generate a second security context root key for use with the E-UTRAN-based serving network. The remote station generates, in response to the first message, a second security context root key from the first enhanced security context root key using the first and second session keys as inputs.
EFFECT: remote station protects wireless communication on the E-UTRAN-based serving network based on the second security context root key.
9 cl, 10 dwg
