Method and apparatus for deleting UE information by single base station

1. A method for deleting, by a mobility management entity (MME) of a local evolved packet core (EPC), user equipment (UE) information in a wireless communication system, the method comprising:

receiving a UE information delete request message from a normal base station (BS); and

deleting UE information on all UEs in an area of the normal BS,

wherein the local EPC is comprised in an isolated BS, the MME is comprised in the local EPC, and the normal BS comprises no local EPC.

2. The method of claim 1 , wherein when the normal BS detects recovery of a backhaul, the UE information delete request message is received from the normal BS.

3. The method of claim 2 , further comprising transmitting, by the MME of the local EPC, a UE information delete response message to the normal BS when the UE information is deleted.

4. The method of claim 3 , wherein the UE information delete request message is one of a new message, an existing message, a new information element (IE) comprised in a new message, and a new IE comprised in an existing message, and

wherein the UE information delete response message is one of a new message, an existing message, a new IE comprised in a new message, and a new IE comprised in an existing message.

5. The method of claim 1 , further comprising receiving, by the MME of the local EPC, an S1 removal request message from the normal BS.

6. The method of claim 5 , wherein when the normal BS detects recovery of a backhaul, the S1 removal request message is received from the normal BS.

7. The method of claim 5 , further comprising removing, by the MME of the local EPC, transport network layer (TNL) association directed to the normal BS.

8. The method of claim 7 , further comprising removing, by the MME of the local EPC, an S1 interface between the normal BS and the MME of the local EPC.

9. A method for deleting, by a mobility management entity (MME) of a local evolved packet core (EPC), user equipment (UE) information in a wireless communication system, the method comprising:

receiving a UE context release request message from a normal base station (BS);

initiating a UE context release procedure; and

deleting UE information corresponding to the UE context release request message,

wherein the UE context release request message comprises an S1 connection recovery indication indicating recovery of an S1 connection between a normal EPC and the normal BS, and

wherein the local EPC is comprised in an isolated BS, the MME is comprised in the local EPC, the normal BS comprises no local EPC, and the normal EPC is an EPC other than the local EPC comprised in the isolated BS.

10. The method of claim 9 , wherein the UE context release procedure is initiated when the MME of the local EPC transmits a UE context release command message to the normal BS.

11. The method of claim 10 , wherein when the MME of the local EPC receives a UE context release complete message from the normal BS, the UE information is deleted.

12. The method of claim 11 , wherein the S1 connection corresponding to the UE information is released.

13. A method for removing, by a mobility management entity (MME) of a local evolved packet core (EPC), an S1 interface between a normal base station (BS) and the MME of the local EPC in a wireless communication system, the method comprising:

detecting recovery of an S1 connection between the normal BS and a normal EPC;

transmitting an S1 removal request message to the normal BS;

receiving an S1 removal response message from the normal BS; and

removing transport network layer (TNL) association directed to the normal BS,

wherein the local EPC is comprised in an isolated BS, the MME is comprised in the local EPC, the normal BS comprises no local EPC, and the normal EPC is an EPC other than the local EPC comprised in the isolated BS.

14. The method of claim 13 , further comprising removing, by the MME of the local EPC, the S1 interface between the normal BS and the MME of the local EPC.