Patent ID: 8706086

Claim:
A method performed by a core network node of a communication network for detection of a manipulated or defective status of a source base station in connection with a handover of a user equipment (UE) to a target base station, said method comprising: receiving and storing a Prioritized Algorithm List (PAL) from the network, said list listing algorithms allowed for use when communicating with said UE in order of priority; receiving and storing UE security capabilities (SCAP) from said UE; receiving, from said target base station, UE SCAP related information of said UE, said UE SCAP related information having been reported from the source base station to said target base station previously during said handover; and verifying the UE SCAP related information received from the target base station in order to detect a manipulated or defective status of the source base station by comparing at least part of said stored UE SCAP to the UE SCAP related information.