Patent ID: 8331906

Claim:
An apparatus, comprising at least one processor and at least one memory storing program code, the memory and program code being configured to, with the processor, direct the apparatus to at least: receive, prior to a handover operation, first key indication information; cause, prior to the handover operation, key information to be created based on the received first key indication information; cause the created key information to be retained; cause to be sent, after the handover operation, the received first key indication information upon which the creation of the key information was based; and cause, after the handover operation, the created key information to be retrieved based on the received first key indication information; wherein: the key information comprises at least one of a ciphering key or an integrity key, or the first key identification information comprises a key set identifier; and further wherein: the apparatus is a user equipment, or the apparatus is compliant to at least one of: a universal mobile telecommunications system terrestrial radio access network, a global system for mobile communication enhanced data rates for global evolution radio access network, or an evolved universal mobile telecommunications system terrestrial radio access network.