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1. (WO2019030567) METHOD AND APPARATUS FOR ATTACH PROCEDURE WITH SECURITY KEY EXCHANGE FOR RESTRICTED SERVICES FOR UNAUTHENTICATED USER EQUIPMENT
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CLAIMS

We claim:

1. A method, comprising:

sending at least one of a restricted local operator services indication and security capabilities associated with the restricted local operator services;

receiving a non-access stratum key exchange request including a symmetric root key, the symmetric root key being encrypted with a public key;

acknowledging the non-access stratum key exchange request;

deriving a non-access stratum security key with the symmetric root key; and

deriving radio interface keys for user plane and radio resource control with the symmetric root key.

2. The method according to claim 1, wherein the method is implemented by a user equipment.

3. The method according to claim 1, wherein the public key is a first public key, the method further comprising:

receiving a broadcast system information message, the broadcast system information including the first public key; and

sending a non-access stratum request message including at least one of the security capabilities associated with restricted local operator services and a second public key.

4. The method according to claim 3, further comprising encrypting the second public key with the first public key.

5. The method according to claim 1, wherein the public key is a first public key, the method further comprising:

receiving the first public key in a first non-access stratum request message; and

sending a second non-access stratum message including at least one of the security capabilities associated with restricted local operator services and a second public key in response to the receiving the first public key.

6. The method according to claim 5, further comprising encrypting the second public key with the first public key.

7. The method according to claim 5, further comprising sending a third non-access stratum request message including a restricted local operator services indication before sending the second non-access stratum request message.

8. An apparatus, comprising:

a transceiver that sends at least one of a restricted local operator services indication and security capabilities associated with the restricted local operator services and receives a non-access stratum key exchange request including a symmetric root key, the symmetric root key being encrypted with a public key; and a controller that acknowledges the non-access stratum key exchange request, derives a non-access stratum security key with the symmetric root key, and derives radio interface keys for user plane and radio resource control with the symmetric root key.

9. The apparatus according to claim 8, wherein the apparatus is a user equipment.

10. The apparatus according to claim 8, wherein the public key is a first public key, wherein the transceiver further receives a broadcast system information message, the broadcast system information including the first public key, and sends a non-access stratum request message including at least one of the security capabilities associated with restricted local operator services and a second public key.

11. The apparatus according to claim 9, wherein the controller further encrypts the second public key with the first public key.

12. The apparatus according to claim 8, wherein the public key is a first public key, wherein the transceiver further receives the first public key in a first non- access stratum request message and sends a second non-access stratum message including at least one of the security capabilities associated with restricted local operator services and a second public key in response to the receiving the first public key.

13. The apparatus according to claim 12, wherein the controller further encrypts the second public key with the first public key.

14. The apparatus according to claim 12, wherein the transceiver further sends a third non-access stratum request message including a restricted local operator services indication before sending the second non-access stratum request message.