Handling of reestablishment failure ambiguity
Embodiments described herein relate to methods and apparatuses for performing a re-establishment procedure. A method in a user equipment comprises: receiving a re-establishment message; upon reception of the re-establishment message, monitoring for an indication of an integrity check failure received from lower layers, wherein the indication relates to a first message or a second message received by the UE after transmitting a re-establishment request; responsive to the indication of the integrity check failure, performing actions upon going into an RRC_IDLE mode of operation; indicating a connection failure to upper layers; and based on the indication, upper layers triggering a recovery procedure.
1. A method performed by a user equipment, UE, in communication with a network for performing a re-establishment procedure, the method comprising:
receiving a re-establishment message;
upon reception of the re-establishment message, monitoring for an indication of an integrity check failure received from lower layers, wherein the indication relates to a first message or a second message received by the UE after transmitting a re-establishment request;
responsive to the indication of the integrity check failure, performing actions upon going into an RRC_IDLE mode of operation;
indicating a connection failure to upper layers; and
responsive to the indication of the connection failure to the upper layers, triggering, by the upper layers, a recovery procedure.
2. The method of claim 1 , wherein the re-establishment message comprises a message for re-establishing a connection in response to the re-establishment request transmitted by the UE.
3. The method of claim 1 , wherein the first message comprises a message for re-establishing a connection in response to the re-establishment request transmitted by the UE and/or a message that is integrity protected that is transmitted by the network after receiving the re-establishment request transmitted by the UE.
4. The method of claim 1 , wherein the second message comprises a message that is integrity protected that is transmitted by the network after transmitting a message re-establishing a connection in response to the re-establishment request transmitted by the UE.
5. The method of claim 1 , wherein steps of receiving, monitoring, performing and indicating are performed by a first layer in a radio protocol architecture stack.
6. The method of claim 1 , wherein the recovery procedure comprises a non-access stratum, NAS, recovery procedure.
7. The method of claim 6 , wherein the recovery procedure comprises a registration area update.
8. The method of claim 1 , wherein the recovery procedure comprises a procedure comprising a protection mechanism to avoid action of a fake base station.
9. The method of claim 1 , wherein the connection failure to the upper layers is due to the integrity check failure.
10. A user equipment, UE, in communication with a network for performing a re-establishment procedure, the UE comprising processing circuitry configured to:
receive a re-establishment message;
upon reception of the re-establishment message, monitor for an indication of an integrity check failure received from lower layers, wherein the indication relates to a first message or a second message received by the UE after transmitting a re-establishment request;
responsive to the indication of the integrity check failure, perform actions upon going into an RRC_IDLE mode of operation;
indicate a connection failure to upper layers; and
responsive to the indication of the connection failure to the upper layers, triggering, by the upper layers, a recovery procedure.
11. The UE of claim 10 , wherein the re-establishment message comprises a message for re-establishing a connection in response to the re-establishment request transmitted by the UE.
12. The UE of claim 10 , wherein the first message comprises a message for re-establishing a connection in response to the re-establishment request transmitted by the UE and/or a message that is integrity protected that is transmitted by the network after receiving the re-establishment request transmitted by the UE.
13. The UE of claim 10 , wherein the second message comprises a message that is integrity protected that is transmitted by the network after transmitting a message re-establishing a connection in response to the re-establishment request transmitted by the UE.
14. The UE of claim 10 , wherein the processing circuitry is configured to perform steps of receiving, monitoring, performing and indicating in a first layer in a radio protocol architecture stack.
15. The UE of claim 10 , wherein the recovery procedure comprises a non-access stratum, NAS, recovery procedure.
16. The UE of claim 15 , wherein the recovery procedure comprises a registration area update.
17. The UE of claim 10 , wherein the recovery procedure comprises a re-establishment procedure comprising a protection mechanism to avoid action of a fake base station.
18. The UE of claim 10 , wherein the connection failure to the upper layers is due to the integrity check failure.