Security mode integrity verification

An apparatus comprising:

• a transmitter that transmits a request message to one or more network devices;
• a processor that, in response to transmitting the request message, authenticates with the one or more network devices;
• and
• a receiver that, in response to successfully authenticating with the one or more network devices, receives a security mode command message, wherein the processor:
• verifies the integrity of the security mode command message;
• and
• in response to the verification of the integrity of the security mode command message indicating that a security key is invalid, performs a cell reselection procedure.

A method comprising:

• receiving a request message corresponding to a user equipment;
• in response to receiving the request message, determining whether the request message is valid based on information corresponding to the user equipment;
• and
• in response to determining that the request message is invalid, transmitting a response message indicating to the user equipment that the request message is rejected.

An apparatus comprising:

• a receiver that receives a request message corresponding to a user equipment;
• a processor that, in response to receiving the request message, determines whether the request message is valid based on information corresponding to the user equipment;
• and
• a transmitter that, in response to determining that the request message is invalid, transmits a response message indicating to the user equipment that the request message is rejected.

A method comprising:

• receiving an authentication request message corresponding to a user equipment;
• and
• in response to receiving the authentication request message:
• determining whether the user equipment has moved from a first public land mobile network to a second public land mobile network within a predetermined period of time;
• in response to the user equipment having moved from the first public land mobile network to the second public land mobile network within the predetermined period of time, determining a likelihood factor that indicates a likelihood that the user equipment moved from the first public land mobile network to the second public land mobile network;
• and
• in response to the likelihood factor being less than a predetermined threshold, transmitting an authentication response message indicating a failed authentication.

An apparatus comprising:

• a transmitter;
• a processor;
• and
• a receiver that receives an authentication request message corresponding to a user equipment, wherein, in response to receiving the authentication request message:
• the processor determines whether the user equipment has moved from a first public land mobile network to a second public land mobile network within a predetermined period of time;
• the processor, in response to the user equipment having moved from the first public land mobile network to the second public land mobile network within the predetermined period of time, determines a likelihood factor that indicates a likelihood that the user equipment moved from the first public land mobile network to the second public land mobile network;
• and
• the transmitter, in response to the likelihood factor being less than a predetermined threshold, transmits an authentication response message indicating a failed authentication.