Systems, methods, apparatuses, and computer program products for mobility management in NR based non-terrestrial networks are provided. One method includes signaling geographical definitions of Geo-Areas (GAs) and/or an update to GA map to at least one user equipment (UE) in a network, and receiving a tracking area update (TAU) and/or radio access network (RAN)-based notification area update (RNAU) when the at least one UE detects a change in the at least one UE's GA location. The method may also include registering the change in the at least one UE's GA location, and configuring at least one of radio access network (RAN)-based notification area (RNA) or tracking area (TA) based on the registered change in the at least one UE's GA location.

Systems, methods, apparatuses, and computer program products for mobility management in NR based non-terrestrial networks are provided. One method includes signaling geographical definitions of Geo-Areas (GAs) and/or an update to GA map to at least one user equipment (UE) in a network, and receiving a tracking area update (TAU) and/or radio access network (RAN)-based notification area update (RNAU) when the at least one UE detects a change in the at least one UE's GA location. The method may also include registering the change in the at least one UE's GA location, and configuring at least one of radio access network (RAN)-based notification area (RNA) or tracking area (TA) based on the registered change in the at least one UE's GA location.

The present invention relates to the coordination of simultaneous multi-RAT camping in a wireless communication network that provides radio access for a terminal device via at least a first and second wireless radio access operating with different radio access technologies. The improved multi-RAT camping is achieved by transmitting, by a network node, an indication regarding a set of camping areas, CAs, including a first set of camping areas being associated with the first RAT and a second set of camping areas being associated with the second RAT; performing, by the terminal device, camping in a coverage area defined based on the set of CAs; and updating, by the terminal device, the communication network with a geographic location of the terminal device a) when the terminal device enters a new coverage area being different from the coverage area defined by both the first and second set of CAs as a first mechanism, or b) when the terminal device enters a new coverage area being different from the coverage area defined by one of the first and second set of CAs as a second mechanism.

The present invention relates to the coordination of simultaneous multi-RAT camping in a wireless communication network that provides radio access for a terminal device via at least a first and second wireless radio access operating with different radio access technologies. The improved multi-RAT camping is achieved by transmitting, by a network node, an indication regarding a set of camping areas, CAs, including a first set of camping areas being associated with the first RAT and a second set of camping areas being associated with the second RAT; performing, by the terminal device, camping in a coverage area defined based on the set of CAs; and updating, by the terminal device, the communication network with a geographic location of the terminal device a) when the terminal device enters a new coverage area being different from the coverage area defined by both the first and second set of CAs as a first mechanism, or b) when the terminal device enters a new coverage area being different from the coverage area defined by one of the first and second set of CAs as a second mechanism.

A first base station receives from a first core network entity, one or more packets for a wireless device in a radio resource control inactive state. The first base station initiates a radio access network (RAN) paging procedure. The first base station sends to a second core network entity and in response to a failure of the RAN paging procedure, a first message indicating the failure of the RAN paging procedure. The first base station receives, in response to the first message, a second message comprising a tunnel endpoint identifier of a third base station. The first base station sends to the third base station, the one or more packets based on the tunnel endpoint identifier.

The present disclosure relates to a communication technique for combining, with an IoT technology, a 5G communication system for supporting a data transmission rate higher than that of a 4G system, and to a system therefor. The present disclosure may be applied to intelligent services (e.g., a smart home, a smart building, a smart city, a smart car or connected car, healthcare, digital education, retail business, security and safety-related service, etc.), based on a 5G communication technology and an IoT-related technology. A method for a user equipment in a first communication system according to the present invention comprises steps in which a user equipment in an inactive state: transmits a paging area update request message; checks whether or not a timer associated with a paging area update has expired; and transitions into an idle state if a response message for the paging area update request message has not been received until the timer has expired.

The present disclosure relates to a communication technique for combining, with an IoT technology, a 5G communication system for supporting a data transmission rate higher than that of a 4G system, and to a system therefor. The present disclosure may be applied to intelligent services (e.g., a smart home, a smart building, a smart city, a smart car or connected car, healthcare, digital education, retail business, security and safety-related service, etc.), based on a 5G communication technology and an IoT-related technology. A method for a user equipment in a first communication system according to the present invention comprises steps in which a user equipment in an inactive state: transmits a paging area update request message; checks whether or not a timer associated with a paging area update has expired; and transitions into an idle state if a response message for the paging area update request message has not been received until the timer has expired.

A communication system is disclosed in which an anchor base station configures a RAN based paging area for a communication device. When the anchor base station determines that it is necessary to update the RAN based paging area, it seeks to inform the communication device indicating that the RAN paging area for the communication device needs to be updated at the communication device, and subsequently, the base station may broadcast system information comprising information identifying a change to the paging area (e.g. a removal of a cell). The broadcasting of system information may also be carried out in other cells of the paging area.

A communication system is disclosed in which an anchor base station configures a RAN based paging area for a communication device. When the anchor base station determines that it is necessary to update the RAN based paging area, it seeks to inform the communication device indicating that the RAN paging area for the communication device needs to be updated at the communication device, and subsequently, the base station may broadcast system information comprising information identifying a change to the paging area (e.g. a removal of a cell). The broadcasting of system information may also be carried out in other cells of the paging area.

Embodiments of this disclosure provide a paging method and a related device. The method includes: obtaining, by an access and mobility management network element, a paging area of a terminal, determined by a network data analytics network element, where the paging area is smaller than a registration area of the terminal; receiving, by the access and mobility management network element, a downlink data notification sent by a session management network element, where the downlink data notification is used to notify that there is downlink data to be sent to the terminal; and sending, by the access and mobility management network element, a paging message to the terminal in idle mode within the paging area.