Abstract: A second RAN node (2) sends to a radio terminal (3), via a first RAN node (1), an indication of available on-demand system information that is available in a cell of the second RAN node (2). It is thus, for example, possible to enabling notifying a UE of an indication about on-demand system information available in a cell served by a secondary gNB of Inter-RAT dual connectivity between E-UTRA and NR, or available in a cell served by a target gNB of Inter-RAT handover from E-UTRA to NR.

Abstract: During handover of a radio terminal (1) from a first network to a second network, a target RAN node (3) is operates to: receive, from a core network (5), slice information about a network slice which is included in the second network and to which the radio terminal (1) is to be connected; create, upon receiving the slice information, radio resource configuration information that is to be used by the radio terminal (1) after the handover in the second network; and transmit this radio resource configuration information through the first network to the radio terminal (1). It is possible to contribute to appropriately configuring an AS layer or NAS layer of a target RAT in inter-RAT handover.

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 Distributed Unit (DU) (2) of a base station sends a first message to a Central Unit (1) of the base station in response to detecting initiation of a conditional mobility of a radio terminal (3) from a first cell served by the DU (2) to a second cell. It is thus for example possible to allow a Central Unit (CU) to be aware of satisfaction of an execution condition of a conditional mobility (or initiation of the conditional mobility).

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 central unit (1) of a base station sends, to a distributed unit (2) of the base station, a message requesting addition of a secondary cell for carrier aggregation. The message contains a first information element indicating that the secondary cell needs to be initially activated or dormant. It is thus, for example, possible to contribute to improvement for enabling direct configuration of a secondary cell state in an architecture where a base station divides into a central unit and a distributed unit.

Abstract: When a secondary cell of carrier aggregation has been activated, a radio terminal (2) communicates with a radio access network (RAN) node (1) in an active downlink (DL) bandwidth part (BWP) selected from among a plurality of DL BWPs for the secondary cell. In addition, when the secondary cell is in a dormant state, the radio terminal (2) transmits to the RAN node (1), via a primary cell or another activated serving cell of the carrier aggregation, a channel state information report for a target DL BWP selected from among the plurality of DL BWPs. It is thus, for example, possible to allow the radio terminal to perform channel a state information measurement on a dormant SCell that has been configured with a plurality of BWPs.

Abstract: During handover of a radio terminal (1) from a first network to a second network, a target RAN node (3) is operates to: receive, from a core network (5), slice information about a network slice which is included in the second network and to which the radio terminal (1) is to be connected; create, upon receiving the slice information, radio resource configuration information that is to be used by the radio terminal (1) after the handover in the second network; and transmit this radio resource configuration information through the first network to the radio terminal (1). It is possible to contribute to appropriately configuring an AS layer or NAS layer of a target RAT in inter-RAT handover.

Abstract: In order to make it possible to report an amount of data from a secondary node (SN) to a master node (MN) in dual connectivity, there is provided a first unit according to the present disclosure which is a first unit of a central unit of a first base station. The first unit includes a controller and a transceiver. The central unit is configured to host at least PDCP layer in the first base station; and is connected to a distributed unit via a first interface, the distributed unit hosting RLC, MAC and PHY layers in the first base station. The controller is configured to host at least a user plane of the PDCP layer hosted by the central unit; and the transceiver is configured to transmit, to a second unit via a second interface, first information indicative of a volume of data processed by the first unit. The second unit is configured to host at least a control plane of the PDCP layer hosted by the central unit.

Abstract: A communication system is described in which an MBMS service is provided by unicast or broadcast/multicast communication in dependence on whether the number of mobile communication devices indicating an interest in receiving the service is below or above a broadcast threshold. An improved procedure for counting the number of mobile communication devices interested in receiving the MBMS service is also disclosed.

Abstract: A communication system is disclosed in which an MME receives an indication that a base station of a tracking area supports extended discontinuous reception, eDRX. The MME determines that paging is required for a communication device and that the communication device may be located in a cell of a base station of the tracking area. The MME triggers paging of the communication device in accordance with discontinuous reception, DRX, information that is not specific to eDRX via base stations that support eDRX and triggered paging of the communication device in accordance with eDRX specific information via base stations which support eDRX has been received.

Abstract: A second RAN node (2) associated with a second RAT sends a radio resource configuration of the second RAT to a radio terminal (3) via a first RAN node (1) associated with a first RAT. The radio resource configuration explicitly or implicitly indicates at least one numerology that is included in multiple numerologies supported by the second RAT and is different from a reference numerology. It is thus, for example, possible to allow a radio terminal to be configured with a numerology of a cell served by a secondary gNB or a target gNB in Inter-RAT Dual Connectivity between E-UTRA and NR and in a handover from E-UTRA to NR.

Abstract: In response to receiving a signaling message requesting a broadcast of specific system information from a central unit (1) of a base station, a distributed unit (2) of the base station changes an active downlink (DL) Bandwidth Part (BWP) of a plurality of radio terminals from a first DL BWP that is not configured with a search space (SS) for receiving the specific system information to a second DL BWP that is configured with an SS for receiving the specific system information. In addition, the distributed unit (2) broadcasts the specific system information on the second DL BWP.

Abstract: In response to receiving from a source RAN node (2), on a direct interface (101), a message requesting a handover of a radio terminal (1) from a first network to a second network, a target RAN node (3) receives at least one of slice information and flow information from a core network (5), and controls communication of the radio terminal (1) based on at least one of the slice information and the flow information. The slice information relates to a network slice in the second network. The flow information relates to at least one session to be established in the second network, serving as a bearer-less network, in order to transfer at least one packet flow of the radio terminal (1). It is thus possible, for example, to provide an Inter-RAT handover procedure involving transfer of handover signaling messages on a direct inter-base-station interface.

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: During handover of a radio terminal (1) from a first network to a second network, a target RAN node (3) is operates to: receive, from a core network (5), slice information about a network slice which is included in the second network and to which the radio terminal (1) is to be connected; create, upon receiving the slice information, radio resource configuration information that is to be used by the radio terminal (1) after the handover in the second network; and transmit this radio resource configuration information through the first network to the radio terminal (1). It is possible to contribute to appropriately configuring an AS layer or NAS layer of a target RAT in inter-RAT handover.

Abstract: When a radio terminal (2) in a first RAT RRC_INACTIVE state in the first radio access network (RAN) (3) and having a Non-Access Stratum (NAS) connection with a first core network (CN) (4) associated with the first RAT moves to a cell (51) of a second RAN (6), the radio terminal (2) alters an RRC state transition operation of the radio terminal (2) depending on whether the second RAN (6) supports interworking with at least one of the first CN (4) and the first RAN (3).

Abstract: A master RAN node (1) sends, to a control plane function (5) in a core network (4), a modification request for modification of a first PDU session already established between a radio terminal (3) and a user plane function (6) in the core network (4). The modification request implicitly or explicitly indicates that PDU session split is needed for the first PDU session. The modification request causes the control plane function (5) to control the user plane function (6) to move a specific one or more QoS flows of a plurality of QoS flows associated with the first PDU session from a first tunnel between the user plane function (6) and the master RAN node (1) to a second tunnel between the user plane function (6) and a secondary RAN node (2). This contributes, for example, to implementing PDU session split in a radio communication network.

Abstract: A system is disclosed in which a base station performs an Automatic Neighbour Relation (ANR) operation in relation to a Wireless Local Area Network (WLAN) and obtains, from a mobile communication device (UE) or a Mobility Management Entity (MME), the Transport Network layer (TNL) address associated with a WLAN Termination node of the WLAN for establishing a connection between the base station and the WLAN Termination node.

Abstract: A communication system is disclosed in which a distributed base station apparatus comprises a central unit for control plane signalling (CU-CP), at least one a central unit for user plane signalling (CU-UP), and at least one distributed unit. The CU-CP obtains information indicating whether a security configuration is supported by a CU-UP and selects a security configuration for an item of user equipment (UE) based on the obtained information.