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 10 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: The present disclosure provides an apparatus, and a method for optimizing user equipment (UE) power consumption on activated Secondary Cells during dormancy and non-dormancy behavior based on the first configuration and second configuration information as provided by radio station.

Abstract: If uplink data together with an RRC resume request message is received from a radio terminal in an RRC_INACTIVE state and a radio terminal context is not available in a first RAN node (1), the first RAN node (1) sends a second type of control message to a second RAN node (2). The second type of control message requests the radio terminal context, and is distinct from a first type of control message that is sent to the second RAN node (2) by the first RAN node (1) when an RRC resume request message not accompanied by uplink data is received. This can contribute, for example, to enabling uplink (UL) data of a radio terminal in RRC_INACTIVE to be transmitted to a core network without relocating a radio terminal context from an old RAN node to a new RAN node.

Abstract: A Secondary Node (SN) (2) transmits to a UE (3), via a Master Node (MN) or via a direct signaling radio bearer between the SN (2) and the UE (3), an SN RRC message containing configurations of a plurality of candidate PSCells for a first conditional PSCell change. The SN RRC message indicates that a mode of operation is applied, requested, recommended, or available in which a configuration of at least one candidate PSCell not selected in the first conditional PSCell change is to be reused by the UE (3) for a subsequent second conditional PSCell change. This can help, for example, to implement a feature or mode of operation that enables a subsequent second conditional mobility without reconfiguration or reinitialization by the network after a first conditional mobility.

Abstract: A target RAN node (3) receives, from a core network (5), a message requesting a handover of a radio terminal (1) from a bearer-based network to a bearer-less network. This handover request message includes flow information related to at least one session to be established in the bearer-less network in order to transfer at least one packet flow of the radio terminal (1). The target RAN node (3) transmits, to the core network (5), a handover acknowledge response message containing a transparent container that includes a radio resource configuration information derived from the flow information and is to be forwarded to a source RAN node associated (2) through the core network (5). It is thus, for example, possible to appropriately configuring an AS layer of a target RAT in an inter-RAT handover.

Abstract: A RAN node (1) broadcasts a first initial bandwidth part (BWP) configuration via system information, and broadcasts a second initial BWP configuration via the system information or transmits it via radio terminal dedicated signaling. The first initial BWP configuration includes cell-specific common parameters of a first initial BWP of a cell, while the second initial BWP configuration includes cell-specific common parameters of a second initial BWP of the cell. The second initial BWP is not used by a first type of radio terminal, but is used by a second type of radio terminal. The bandwidth of the second initial BWP is equal to or narrower than of the first initial BWP. This allows the second type of radio terminal, which has a limited capability compared to the first type of radio terminal, to use an initial BWP suitable for its capability.

Abstract: If an execution condition for a first conditional mobility is satisfied with respect to one of a plurality of candidate target cells, a UE (3) executes the first conditional mobility by applying a configuration corresponding to the one candidate target cell. The UE (3) reuses one or more execution conditions with respect to one or more candidate target cells other than the one candidate target cell in a subsequent second conditional mobility, while switching a reference cell in each execution condition from the source cell of the first conditional mobility to the one candidate target cell. This can help, for example, to implement a feature or mode of operation that enables a subsequent second conditional mobility without reconfiguration or reinitialization by the network after a first conditional mobility.

Abstract: A master node (MN) (1) controls the MN (1) to enable, for a radio terminal (3), dual connectivity using a Master Cell Group (MCG) provided by the MN (1) and a Secondary Cell Group (SCG) provided by a secondary node (SN) (2). The MN (1) sends an indication regarding an MCG failure to the SN (2). The MN (1) transmits an RRC message related to recovery of the MCG failure to the radio terminal (3), via an SCG part of a split signalling radio bearer between the MN (1) and the radio terminal (3). This, for example, allows the SN to learn of an occurrence of the MCG failure.

Abstract: A Master Node (MN) (1) sends a control message to a candidate Secondary Node (SN) (4). The control message indicates that one or more candidate PSCells are to be prepared by the candidate SN for a first conditional mobility with addition or change of a PSCell for a UE (3). In addition, the control message indicates that a mode of operation is recommended in which configurations of the one or more candidate PSCells to be provided to the UE (3) for the first conditional mobility are reused by the UE (3) for a subsequent conditional PSCell change after the first conditional mobility. This can help, for example, to implement a feature or mode of operation that enables a subsequent second conditional mobility without reconfiguration or reinitialization by the network after a first conditional mobility.

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: 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: While an MN-initiated inter-SN Conditional Primary Secondary Cell Group (SCG) Cell (PSCell) Change (CPC) from a source Secondary Node (S-SN) (2) to a target SN (T-SN) (4) is in progress with respect to a PSCell of an SCG of the User Equipment (UE) (3), a Master Node (MN) (1) does not configure, prepare, or allow an SN-initiated inter-SN CPC to at least the same T-SN (4) with respect to the same UE (3). For example, this can contribute to avoiding complex processing for Inter-SN CPC.

Abstract: The present disclosure discloses a method for a User Equipment (UE). The method comprises: establishing a communication session with a network node for transmission of data; receiving a configuration message indicating information for one or more of transmission slots for a plurality of logical channels; setting up for transmission of data based on the received configuration message to select one or more logical channels of the plurality of logical channels; and prioritizing the selection of plurality of logical channels when the UE is indicative of initiation of transmission of data.

Abstract: A master node (1) requests a conditional PSCell addition (CPA), via an SN ADDITION REQUEST message (301), to a candidate secondary node (2). The master node (1) also requests the candidate secondary node (2) to configure an SN terminated MCG bearer via the SN ADDITION REQUEST message (301). This can, for example, contribute to mitigating a communication continuity problem caused by a Conditional PSCell Addition (CPA) failure.

Abstract: A radio terminal (1) transmits assistance information to a network (2). The assistance information is used to train a first machine learning model related to radio access network (RAN) optimization or to perform inference on a first trained machine learning model related to RAN optimization. The assistance information includes one or both of statistical data and predicted data. The statistical data indicates a subset of historical data of a given event, extracted by filtering the historical data by one or more conditions. The predicted data is generated by the radio terminal (2) by prediction or decision using a second trained machine learning model. This helps, for example, to enable a radio terminal to provide a network with data suitable for training or inference in network-based machine learning.

Abstract: A master node (MN) (1) controls the MN (1) to enable, for a radio terminal (3), dual connectivity using a Master Cell Group (MCG) provided by the MN (1) and a Secondary Cell Group (SCG) provided by a secondary node (SN) (2). The MN (1) sends an indication regarding an MCG failure to the SN (2). The MN (1) transmits an RRC message related to recovery of the MCG failure to the radio terminal (3), via an SCG part of a split signalling radio bearer between the MN (1) and the radio terminal (3). This, for example, allows the SN to learn of an occurrence of the MCG failure.

Abstract: A RAN node (1) broadcasts a first initial bandwidth part (BWP) configuration via system information, and broadcasts a second initial BWP configuration via the system information or transmits it via radio terminal dedicated signaling. The first initial BWP configuration includes cell-specific common parameters of a first initial BWP of a cell, while the second initial BWP configuration includes cell-specific common parameters of a second initial BWP of the cell. The second initial BWP is not used by a first type of radio terminal, but is used by a second type of radio terminal. The bandwidth of the second initial BWP is equal to or narrower than of the first initial BWP. This allows the second type of radio terminal, which has a limited capability compared to the first type of radio terminal, to use an initial BWP suitable for its capability.

Abstract: A radio station (2) transmits configuration information (501) to a radio terminal (1). The configuration information (501) indicates, on a cell-by-cell basis, at least one specific cell on which the radio terminal (1) is allowed to perform at least one of data transmission and data reception on a radio bearer used for uplink transmission or downlink transmission or both via a common Packet Data Convergence Protocol (PDCP) layer (402). As a result, in a radio architecture that provides tight interworking of two different Radio Access Technologies (RATs), it is for example possible to allow an eNB to indicate, to a radio terminal (UE), a specific cell on which the UE should perform uplink transmission.

Abstract: In response to receiving a first signal indicating a request or indication of Secondary Cell Group (SCG) activation from a User Equipment (UE) (3) via a PSCell of the SCG, a secondary node (SN) (2) transmits a second signal indicating activation of the SCG to the UE via the PSCell. The second signal is transmitted to the UE (3) before the SN (2) sends an inter-node message indicating activation of the SCG to a master node (MN) (1) or before the SN (2) receives a response to the inter-node message from the MN (1). This can, for example, help to reduce the delay in the activation of the SCG triggered by the UE.

Abstract: A communication system is disclosed in which a base station apparatus obtains information identifying a total integrity protected uplink data rate for a user equipment (UE), allocates a portion of the total integrity protected uplink data rate to a secondary node (SN), and notifies the UE about the portion allocated to the SN.