Rogue unit detection information

1. A method comprising:

maintaining rogue unit detection information at a user equipment, wherein the rogue unit detection information comprises information for detecting a rogue unit, the rogue unit comprises a false base station, the rogue unit detection information comprises a public key and a validity time corresponding to the public key, the public key is received in broadcast signaling for a plurality of user equipments, and the validity time is received within system information for the user equipment;

determining, at the user equipment, whether the validity time for the public key is within an expiration window;

in response to determining that the validity time for the public key is within the expiration window, transmitting, from the user equipment to a network unit, a request for new rogue unit detection information comprising a new public key and a new validity time corresponding to the new public key; and

receiving, at the user equipment, the new rogue unit detection information.

2. The method of claim 1 , wherein the rogue unit detection information comprises a plurality of pubic keys and a plurality of validity times, and each public key of the plurality of public keys corresponds to a validity time of the plurality of validity times.

3. The method of claim 1 , wherein the expiration window comprises the validity time for the public key being expired or the validity time for the public key being within a predetermined time threshold.

4. An apparatus comprising a user equipment, the apparatus comprising:

a processor that:

maintains rogue unit detection information, wherein the rogue unit detection information comprises information for detecting a rogue unit, the rogue unit comprises a false base station, the rogue unit detection information comprises a public key and a validity time corresponding to the public key, the public key is received in broadcast signaling for a plurality of user equipments, and the validity time is received within system information for the user equipment; and

determines whether the validity time for the public key is within an expiration window;

a transmitter that, in response to determining that the validity time for the public key is within the expiration window, transmits a request for new rogue unit detection information comprising a new public key and a new validity time corresponding to the new public key to a network unit; and

a receiver that receives the new rogue unit detection information.

5. The apparatus of claim 4 , wherein the processor detects a rogue unit using the new rogue unit detection information.

6. The apparatus of claim 4 , wherein the processor maintains the rogue unit detection information by storing the rogue unit detection information and monitoring the validity time corresponding to the public key.

7. The apparatus of claim 4 , wherein the processor determines whether the validity time for the public key has expired by comparing the validity time to a timer.

8. The apparatus of claim 4 , wherein the processor determines whether the validity time for the public key has expired by comparing the validity time to a current time.

9. The apparatus of claim 4 , wherein the transmitter transmits the request for the new rogue unit detection information by transmitting a request for a renewal of the public key.

10. The apparatus of claim 4 , wherein the receiver receives the new rogue unit detection information by receiving the new rogue unit detection information as part of a signaling procedure.

11. The apparatus of claim 4 , wherein the processor adds the new rogue unit detection information to the rogue unit detection information.

12. The apparatus of claim 4 , wherein the processor replaces the rogue unit detection information with the new rogue unit detection information.

13. A method comprising:

determining at a network unit, whether a user equipment has rogue unit detection information expiring within an expiration window, wherein the rogue unit detection information comprises information for detecting a rogue unit, the rogue unit comprises a false base station, the rogue unit detection information comprises a public key and a validity time corresponding to the public key, the public key is received in broadcast signaling for a plurality of user equipments, and the validity time is received within system information for the user equipment;

in response to determining that the user equipment has rogue unit detection information expiring within the expiration window, determining, at the network unit, new rogue unit detection information comprising a new public key and a new validity time corresponding to the new public key for the user equipment; and

transmitting, from the network unit, the new rogue unit detection information to the user equipment.

14. The method of claim 13 , wherein determining whether the user equipment has rogue unit detection information expiring within the expiration window comprises determining that the validity time corresponding to the public key has expired or is to expire within a predetermined time.

15. The method of claim 13 , wherein determining whether the user equipment has rogue unit detection information expiring within the expiration window comprises determining that the public key is to expire before a next user equipment interaction with the network unit.

16. The method of claim 13 , wherein determining the new rogue unit detection information for the user equipment comprises calculating the new rogue unit detection information.

17. An apparatus comprising a network unit, the apparatus comprising:

a processor that:

determines whether a user equipment has rogue unit detection information expiring within an expiration window, wherein the rogue unit detection information comprises information for detecting a rogue unit, the rogue unit comprises a false base station, the rogue unit detection information comprises a public key and a validity time corresponding to the public key, the public key is received in broadcast signaling for a plurality of user equipments, and the validity time is received within system information for the user equipment; and

in response to determining that the user equipment has rogue unit detection information expiring within the expiration window, determines new rogue unit detection information comprising a new public key and a new validity time corresponding to the new public key for the user equipment; and

a transmitter that transmits the new rogue unit detection information to the user equipment.

18. The apparatus of claim 17 , wherein the processor determines whether the user equipment has rogue unit detection information expiring within the expiration window by determining that the validity time corresponding to the public key has expired or is to expire within a predetermined time.

19. The apparatus of claim 17 , wherein the processor determines whether the user equipment has rogue unit detection information expiring within the expiration window by determining that the public key is to expire before a next user equipment interaction with the network unit.

20. The apparatus of claim 17 , wherein the processor determines the new rogue unit detection information for the user equipment by calculating the new rogue unit detection information.