Abstract: An object of the present invention is to provide a communication system, a base station, a host node, and a communication method in order to address one or more of the above-described problems. A communication system according to the present invention is a communication system including: a base station (10) and a host node (40) that communicates with the base station (10). The base station (10) included in the communication system transmits to the host node (40) setting information indicating whether or not a paging message transmitted from the host node (40) can be transmitted to other base stations, and the host node (40) receives the setting information from the base station (10).

Abstract: A radio access network (RAN) node (11) is configured to send, to another RAN node (12), first control information regarding at least one of one or more bandwidth parts (BWPs) configured in a system bandwidth. It is thus, for example, possible to contribute to inter-radio access network (RAN) node (e.g., inter-gNB) signaling enhanced to handle bandwidth parts.

Abstract: A mobile communication system which can transfer information on the number of packets counted up until then by a base station of a mobile source, to a base station of a mobile target, even when a terminal performs a handover. UE moves to a Target eNode B, but a Source eNode B decides to perform a handover, and the Source eNode B includes information on the number of packets counted up until then in a Handover Request message to the Target eNode B, so as to notify the Target eNode B. After receiving a Handover Confirm message from the UE, the Target eNode B includes information on the number of packets received from the Source eNode B in a Handover Complete message transmitted to a CN Node, so as to notify the CN Node.

Abstract: This wireless communication system has a first base station, and a second base station whereby downlink data received from a core network can be transmitted to a terminal via the second base station and the first base station. The second base station transmits, to the first base station, information that makes it possible to identify whether or not flow control can be carried out.

Abstract: A wireless communication system of the present invention includes a first base station (30) and a second base station (20) configured to be capable of transmitting downlink data received from a core network to a terminal via the second base station (20) and the first base station (30). The second base station (20) transmits, to the first base station (30), information for identifying downlink data to be discarded from among the downlink data transmitted to the first base station (30) and a command for discarding the downlink data identified by the information. The first base station (30) discards downlink data not transmitted to the terminal from among the downlink data identified by the information.

Abstract: A radio terminal (2) controls state transitions of the radio terminal (2) among first to third RRC states. In addition, if the radio terminal (2) is in the second RRC state, if a current cell that the radio terminal (2) has camped on is different from a first cell in which a state transition from the first RRC state to the second RRC state was performed, and if the current cell satisfies a predetermined condition, the radio terminal (2) allows the radio terminal (2) to transmit data to be transmitted in the current cell by a first transmission procedure in which the radio terminal (2) transmits uplink data before entering the first RRC state.

Abstract: An object of the present invention is to provide a communication system, a base station, a host node, and a communication method in order to address one or more of the above-described problems. A communication system according to the present invention is a communication system including: a base station (10) and a host node (40) that communicates with the base station (10). The base station (10) included in the communication system transmits to the host node (40) setting information indicating whether or not a paging message transmitted from the host node (40) can be transmitted to other base stations, and the host node (40) receives the setting information from the base station (10).

Abstract: A secondary base station (2) receives an SeNB addition request message (302) from a second master base station (3) while providing a radio terminal (4) with a secondary cell group (SCG) for DC in cooperation with a first master base station (1). If the SeNB addition request message (302) explicitly or implicitly indicates that a master base station in DC for the radio terminal (4) is to be changed from the first master base station (1) to the second master base station (3), the secondary base station (2) considers that the SeNB addition request message (302) requests modification of the SCG that has already been configured. It is thus, for example, possible to contribute to performing a procedure for changing a master base station in Dual Connectivity (DC) by using existing inter-base station interface procedures and inter-base station signaling messages.

Abstract: A mobile communication system which can transfer information on the number of packets counted up until then by a base station of a mobile source, to a base station of a mobile target, even when a terminal performs a handover. UE moves to a Target eNode B, but a Source eNode B decides to perform a handover, and the Source eNode B includes information on the number of packets counted up until then in a Handover Request message to the Target eNode B, so as to notify the Target eNode B. After receiving a Handover Confirm message from the UE, the Target eNode B includes information on the number of packets received from the Source eNode B in a Handover Complete message transmitted to a CN Node, so as to notify the CN Node.

Abstract: A radio terminal (1) is configured to transmit data using a first communication architecture type, in response to an occurrence of a request for specific data transmission when the radio terminal (1) has already been configured by a network (3) to use a second communication architecture type. This contributes to, for example, when the radio terminal has already been configured by the network to use the second communication architecture type that involves suspension and resumption of an RRC connection, facilitating effectively performing communication according to the first communication architecture type that involves data transmission over a control plane.

Abstract: A gNB central unit (gNB-CU) includes a transmitter and a receiver. The transmitter is configured to transmit a message to a gNB distributed unit (gNB-DU). The receiver is configured to receive from the gNB-DU, in response to the message, a list indicating User Equipments (UEs) which needs to be notified by dedicated signaling of system information.

Abstract: A base station is provided. The base station includes a transmitter and a receiver. The transmitter sends, to a node including mobility management function, a first message, the first message including both first information about a tracking area supported in the base station and second information about a size of a cell of the base station. The receiver receives a response message of the first message from the node including mobility management function.

Abstract: A communication system is disclosed in which am anchor base station receives, from a core network node, downlink data for a communication device. The base station attempts (e.g. by RAN-based paging) to initiate communication with the communication device, and when the communication device does not respond to the attempt to initiate communication, the base station sends a message to the core network node, the message requesting initiation of a paging procedure for the communication device (e.g. S1-based paging).

Abstract: A secondary base station (2) is configured to receive an SeNB addition request message from a second master base station (3) while providing a radio terminal (1) with a secondary cell group (SCG) for DC in cooperation with a first master base station. The SeNB addition request message indicates whether each of at least one bearer that has already been configured in the secondary base station (2) for DC with the first master base station (1) is to be kept at the secondary base station (2). It is thus, for example, possible to contribute to performing a procedure for changing a master base station in Dual Connectivity (DC) by using existing inter-base station interface procedures and inter-base station signaling messages.

Abstract: A wireless communication system of the present invention includes a first base station (30) and a second base station (20) configured to be capable of transmitting downlink data received from a core network to a terminal via the second base station (20) and the first base station (30). The second base station (20) transmits, to the first base station (30), information for identifying downlink data to be discarded from among the downlink data transmitted to the first base station (30) and a command for discarding the downlink data identified by the information. The first base station (30) discards downlink data not transmitted to the terminal from among the downlink data identified by the information.

Abstract: A radio terminal (1) is configured to transmit data using a first communication architecture type, in response to an occurrence of a request for specific data transmission when the radio terminal (1) has already been configured by a network (3) to use a second communication architecture type. This contributes to, for example, when the radio terminal has already been configured by the network to use the second communication architecture type that involves suspension and resumption of an RRC connection, facilitating effectively performing communication according to the first communication architecture type that involves data transmission over a control plane.

Abstract: A base station is provided. The base station includes a transmitter and a receiver. The transmitter transmits, to a node including mobility management function, a setup message, the message including both first information about a tracking area supported in the base station and second information indicating a type of the cell of the base station. The receiver receives a response message of the setup message from the node including mobility management function.

Abstract: A communication system is disclosed in which a number of procedures may be performed between user equipment, a base station, and/or the core network in the context of network slicing. The procedures support, for example efficient configuration of paging areas, roaming, access restriction, mobility, setting up of dual mode connectivity, connection re-establishment, efficient paging and slice selection.

Abstract: A mobile communication system according to the present invention is a mobile communication system including base stations each of which forms a cell and transmits MBMS data to a mobile station existing in the cell, and control stations each of which controls the base station connected thereto, wherein the control stations include at least a control station and a second control station that determines a frequency and timing for transmitting the MBMS data in the cell and instructs the first control station of the determined frequency and timing, and wherein each of the first and second control stations establishes time synchronization with another control station and instructs the connected base station to set the cell to the frequency determined by the second control station and transmits the MBMS data to the connected base station in accordance with the transmission timing determined by the second control station.

Abstract: A base station (1) controls state transitions of a radio terminal (2) among first to third RRC states. In addition, the base station (1) explicitly or implicitly informs the radio terminal (2) about whether a network slice configured in the radio terminal (2) for data communication at least in the first RRC state is available in each cell included in a RAN notification area configured by a RAN (3). It is thus, for example, possible to allow a radio terminal in a first state (e.g., RRC_INACTIVE state) to be easily aware of the availability of network slices in a cell to be reselected or a reselected cell.