Method and apparatus for performing access control for WLAN interworking in wireless communication system

1. A method for performing, by a user equipment (UE), access control in a wireless communication system, the method comprising:

receiving access class barring information for a traffic steered from a wireless local area network (WLAN) to 3rd generation partnership project (3GPP) long-term evolution (LTE) from a network,

wherein the access class barring information for the traffic steered from the WLAN to the 3GPP LTE is received via a broadcast signaling, and

wherein the access class barring information for the traffic steered from the WLAN to the 3GPP LTE includes an access class barring factor and an access class barring time;

if the UE has to establish a radio resource control (RRC) connection for both the traffic steered from the WLAN to the 3GPP LTE and another connection, performing an access barring check only for the traffic steered from the WLAN to the 3GPP LTE or only for the other connection, depending on a type of the other connection,

wherein the access barring check performed only for the traffic steered from the WLAN to the 3GPP LTE includes performing the access barring check using the received access class barring information; and

transmitting a RRC connection request message to the network, if a cell is not barred according to the access barring check.

2. A user equipment (UE) comprising:

a memory;

a transceiver; and

a processor coupled to the memory and the transceiver, and configured to:

control the transceiver to receive access class barring information for a traffic steered from a wireless local area network (WLAN) to 3rd generation partnership project (3GPP) long-term evolution (LTE) from a network,

wherein the access class barring information for the traffic steered from the WLAN to the 3GPP LTE is received via a broadcast signaling, and

wherein the access class barring information for the traffic steered from the WLAN to the 3GPP LTE includes an access class barring factor and an access class barring time;

if the UE has to establish a radio resource control (RRC) connection for both the traffic steered from the WLAN to the 3GPP LTE and another connection, perform an access barring check only for the traffic steered from the WLAN to the 3GPP LTE or only for the other connection, depending on a type of the other connection,

wherein the access barring check performed only for the traffic steered from the WLAN to the 3GPP LTE includes performing the access barring check using the received access class barring information; and

control the transceiver to transmit a RRC connection request message to the network, if a cell is not barred according to the access barring check.

3. The method of claim 1 , wherein, if the type of the other connection is a newly generated mobile originating call, the UE only performs the access barring check for the traffic steered from the WLAN to the 3GPP LTE.

4. The method of claim 1 , wherein, if the type of the other connection is a mobile terminating call, the UE only performs the access barring check for the mobile terminating call.

5. The method of claim 1 , wherein, if the type of the other connection is an emergency call, the UE only performs the access barring check for the emergency call.

6. The method of claim 1 , wherein, if the type of the other connection is a mobile originating circuit-switched (CS) fallback, the UE only performs access barring check corresponding to the traffic steered from the WLAN to the 3GPP LTE.

7. The method of claim 1 , wherein, if the type of the other connection is a newly generated mobile originating call, and if extended access barring (EAB) is applicable, the UE only performs the access barring check for the traffic steered from the WLAN to the 3GPP LTE.