Method for processing loss of access in a wireless communication system, and device therefor

A base station for processing access loss of a UE operating in a single connection mode (SCM) or a transparent SCM (TSCM) and operating on a 3GPP network, the base station comprising:

• a transmitter;
• a receiver;
• and
• a processor operatively coupled to the transmitter and the receiver,
• wherein the processor is configured to:
• control the receiver to receive a measurement report from the UE,
• control the transmitter to transmit data to the UE, based on determination that handover is not required for the UE on the basis of the measurement report, and
• based on an acknowledgement (ACK) signal for the data not being received from the UE for a predetermined time, control the transmitter to transmit a signal informing an access loss of the UE for the 3GPP network to a mobility management entity (MME) operating on the 3GPP network.

A method, performed by a mobility management entity (MME) operating on a 3GPP network, for processing access loss of a user equipment (UE) operating in a single connection mode (SCM) or a transparent SCM (TSCM), the method comprising:

• based on the UE configuring a plurality of packet data network (PDN) connections via access to both the 3GPP network and a wireless local area network (WLAN) network, receiving a first signal informing an access loss of the UE for the 3GPP network from a base station operating on the 3GPP network,
• and
• based on at least one condition of a plurality of conditions, transmitting to a packet gateway (PGW) a second signal informing that the access of the UE for the 3GPP network is lost,
• wherein the plurality of conditions comprise:
• the base station is different from an entity stored in context information owned by the MME with respect to the UE,
• the MME is requested from another network node to provide the context information owned with respect to the UE, and
• the MME does not own the content information with respect to the UE.

A mobility management entity (MME) for processing access loss of a user equipment (UE) operating in a single connection mode (SCM) or a transparent SCM (TSCM) and operating on a 3GPP network, the MME comprising:

• a transmitter;
• a receiver;
• and
• a processor operatively coupled to the transmitter and the receiver,
• wherein the processor is configured to:
• control the receiver to receive a signal informing an access loss of the UE for the 3GPP network from a base station operating on the 3GPP network,
• based on at least one condition of a plurality of conditions, control the transmitter to transmit to a packet gateway (PGW) a second signal informing that the access of the UE for the 3GPP network is lost,
• wherein the plurality of conditions comprise:
• the base station is different from an entity stored in context information owned by the MME with respect to the UE,
• the MME is requested from another network node to provide the context information owned with respect to the UE, and
• the MME does not own the content information with respect to the UE.