A method performed by an access and mobility management function, AMF, in a wireless communication system, the method comprising: providing local access data network, LADN, information for a LADN service to a user equipment, UE, the LADN information including LADN service area information and LADN data network name, DNN, information; obtaining location information about the UE; identifying that a network node determines to establish a packet data unit, PDU, session for providing the LADN service based on the location information; transmitting, to the UE, a preset message including a request for establishing the PDU session; and receiving, from the UE, a request message to initiate establishing the PDU, wherein the network node comprises the AMF, a policy control function, PCF, a network exposure function, NEF, and/or a data network/application function, DN/AF, wherein the preset message comprises an application trigger request message, a paging message, or a non-access stratum, NAS, message including the priority information, wherein the PDU session is determined to be established based on the location information, in case that a location of the UE is inside an LADN service area included in the LADN service area information, and wherein the identifying comprises, receiving an application trigger request message to trigger the LADN service from the DN/AF, receiving an LADN PDU initiation message for requesting to initiate to establish the PDU session from the PCF, or receiving an initiation message for requesting to initiate to establish the PDU session from the PCF, the initiation message including priority information related with establishing the PDU session. providing local access data network, LADN, information for a LADN service to a user equipment, UE, the LADN information including LADN service area information and LADN data network name, DNN, information; obtaining location information about the UE; identifying that a network node determines to establish a packet data unit, PDU, session for providing the LADN service based on the location information; transmitting, to the UE, a preset message including a request for establishing the PDU session; and receiving, from the UE, a request message to initiate establishing the PDU, wherein the network node comprises the AMF, a policy control function, PCF, a network exposure function, NEF, and/or a data network/application function, DN/AF, wherein the preset message comprises an application trigger request message, a paging message, or a non-access stratum, NAS, message including the priority information, wherein the PDU session is determined to be established based on the location information, in case that a location of the UE is inside an LADN service area included in the LADN service area information, and wherein the identifying comprises, receiving an application trigger request message to trigger the LADN service from the DN/AF, receiving an LADN PDU initiation message for requesting to initiate to establish the PDU session from the PCF, or receiving an initiation message for requesting to initiate to establish the PDU session from the PCF, the initiation message including priority information related with establishing the PDU session.