Lg Electronics Inc.

Sungduck Chun

Seungjune Yi

Sunghoon Jung

Youngdae Lee

Sungjun Park

Laeyoung Kim

Hyunsook Kim

Jaehyun Kim

Sangmin Park

Myungjune Youn

Taehun Kim

Sung Jun Park

Jinsook Ryu

Young Dae Lee

Seung June Yi

Jaewook Lee

Dongsoo Kim

Young-Dae Lee

Li-Hsiang Sun

Taehyeon Kim

Ki-Dong Lee

Sunhee Kim

Dongjoo Kim

Hanbyul Seo

Sunyoung Lee

Byounghoon Kim

Sangwon Kim

Jian Xu

Kyungjun Lee

Sehee Lee

One disclosure of the present specification provides a method in which a UE performs communication related to PS Data Off. The method may comprise: a step for transmitting a first PDU session establishment request message in order to establish a PDU session associated with non-3GPP access or 3GPP access; and a step for transmitting a second PDU session establishment request message in order to perform a handover between the non-3GPP access and the 3GPP access for the PDU.

Communication related to PS data off

One disclosure of the present specification provides a communication method of a terminal which must receive a public warning system (PWS) service. The method may comprise the steps of: searching for one or more first stand-alone non-public networks (SNPNs) to which a terminal is subscribed; receiving, from each of the one or more first SNPNs, first PWS information about whether the respective one or more first SNPNs support a PWS service; and, on the basis of the first PWS information, checking whether a specific first SNPN supporting the PWS service is present among the one or more first SNPNs.

PWS service method in NPN

A method for performing, by a user equipment (UE), a registration to a network in a wireless communication system is disclosed. More specifically, the UE performs a registration to a first public land mobile network (PLMN) via a first base station, receives a disaster related message indicating that a disaster roaming service is provided, checks whether the UE is provided with the disaster roaming service based on the disaster related message, selects a second PLMN providing the disaster roaming service when the UE is provided with the disaster roaming service as a result of the check, transmits a registration request message to the selected second PLMN based on the disaster related message, and receives, from the second PLMN, a response message to the registration request message.

Method for allowing registration to network in wireless communication system, and device therefor

One disclosure of the present specification provides a method for performing, by a network node, communication associated with an MA PDU session. The method may comprise the steps of: receiving information indicating that PS data off has been activated for an MA PDU session of a UE; updating a PCC rule on the basis of the information indicating that the PS data off has been activated for the MA PDU session; and transmitting the updated PCC rule to an SMF.

Communication associated with multi-access PDU session

A disclosure of the present specification provides a method of performing communication related to a network slice by a UE. The method may comprise the steps of receiving, from a network, network slice information of a serving cell and network slice information of a neighboring cell; determining that the neighboring cell provides a first network slice that the UE is to use; performing first measurement for a signal of the service cell and second measurement for a signal of the neighboring cell; and determining, on the basis of the first measurement and the second measurement, whether to select the neighboring cell.

Communication related to network slice

A disclosure of the present specification provides a method for performing relay communication by a first UE. The method may comprise the steps of: transmitting a request message including UE ID, relay information, UE type information, and UE public key information to an application server through a 5G core network; receiving, from the application server, a security-related message in response to the request message; establishing a security link with the relay UE on the basis of first credential information; and receiving an IP message for configuring a security channel in an IP layer from a second UE.

Relay communication

One disclosure of the present specification provides a method by which a first network node performs communication on the basis of multiple USIMs. The method can comprise: receiving, from UE, a registration request message including MT service configuration information; receiving, from the UE, information informing that the UE leaves a first network including the first network node; receiving, from a second network node, information related to downlink data about the UE; and transmitting a paging message or a failure indication on the basis of the MT service configuration information and the information related to the downlink data.

Communication related to multiple usims

Provided in one embodiment of the present specification is a method by which an IMS AS performs communication related to a MA PDU session. The method can comprise the steps of: receiving, through a P-CSCF and a S-CSCF, a SIP registration message generated by means of UE, the SIP registration message including information that an IMS service is performed through the MA PDU session, and the SIP registration message including state information that the state of a PS data off of the UE is active; receiving, from the S-CSCF, an SIP request message for requesting the IMS service from the UE; checking whether the IMS service corresponds to an exempt service of the PS data off; including the checked result in the SIP request message; and transmitting the SIP request message to a UPF through the S-CSCF and the P-CSCF.

Communication related to multi access PDU session

Disclosed is a method for providing, by a terminal, a communication service in a wireless communication system, the method including: transmitting, to a first network, a first request message for receiving paging of a second network; receiving, from the first network, a first response message as a response to the first request message; and monitoring the second network or switching to the second network to receive the paging from the second network based on the first response message, in which the terminal may be in a registered state in relation to the first network and the second network, and in a connected state in relation to the first network.

Method for providing communication service in wireless communication system

One disclosure of the present specification provides a method for a terminal roaming in a second Public Land Mobile Network (PLMN) to change the connection to a first PLMN to which the terminal is subscribed. The method may include a step for the first PLMN to receive a first message including first information from a base station in the second PLMN. The method may include a step for inspecting whether a procedure for deregistering from the second PLMN is required. The method may include a step for performing the procedure for deregistering from the second PLMN on the basis of the inspection result. The method may include a step for selecting the first PLMN. The method may include a step for performing a procedure for registering to the first PLMN.

Measure for changing PLMN

One disclosure of the present specification provides a method by which a terminal that joined a first public land mobile network (PLMN) performs a connection. The method may comprise a step for transmitting a first request message to a network node through a base station. The base station may be a base station of a second PLMN that broadcasts system information including information about the first PLMN. The method may comprise a step for receiving, from the network node, a first acceptance message for the first request message. The first acceptance message may include information indicating that there is a service failure in the first PLMN. The method may comprise a step for displaying, on a screen of the terminal, information indicating that the terminal is connected to the second PLMN on the basis of the information.

Method and a first device for an access mobility management function of a second public land mobile network (PLMN) providing disaster roaming services in a wireless communication system

Provided are a method for adjusting timer T when disaster roaming occurs, and a device supporting same. When a disaster condition is applied to a home public land mobile network (HPLMN), a user equipment (UE) performs registration with a disaster roaming PLMN. When the registration with the disaster roaming PLMN is performed, a timer for periodically searching for the HPLMN does not operate, and the HPLMN is not searched while the timer does not operate. In addition, the UE re-operates the timer on the basis of the disaster condition no longer being applied to the HPLMN or the UE leaving a disaster area.

Method for adjusting timer T when disaster roaming occurs, and device supporting same

Provided in one embodiment of the present specification is a method for user equipment (UE) for an Internet protocol multimedia subsystem (IMS) voice session. The method can comprise the steps of: establishing an EMS voice session by using a non 3GPP interworking function (N3IWF) or an enhanced packet data gateway (ePDG) through non-3generation partnership project (3GPP) access; determining that voice is not supported on a current NG-RAN on the basis of that the UE must moves the IMS voice session to a 3GPP access; and handing over a protocol data unit (PDU) session for the IMS voice session of the non-3GPP access to an evolved packet core (EPC) of the 3GPP access on the basis of the determination.

Method for moving IMS voice session on non-3GPP to 3GPP access

A disclosure of the present specification provides a method for performing, by a UE, communication associated with access control. The method may comprise the steps of: acquiring information associated with exception data; determining an access category of an access attempt for the exception data, on the basis of the information associated with the exception data; performing an access control check on the basis of the determined access category; and, when access is allowed according to the access control check, transmitting the exception data.

Communication associated with access control

One disclosure of the present specification provides a method for a user equipment (UE) to access a non-public network (NPN). The method may comprise: a step for selecting a first public land mobile network (PLMN); a step for, when the UE is configured to use the NPN, determining whether the NPN is available in a first cell of the first PLMN on the basis of NPN-related configuration information; a step for, when it is determined that the NPN is available in the first cell of the first PLMN, attempting to access the first cell in the first PLMN; and a step for, when it is determined that the NPN is not available in the first cell of the first PLMN, not attempting to access the first cell in the first PLMN.

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Seoul, South Korea

Sungduck Chun