Abstract: A UE (200) performs a random access procedure with a gNB (100). The UE (200) transmits to a network via a radio base station at least one of a synchronization signal block used for performing the random access procedure, a reception quality in the synchronization signal block, a group of random access preambles, and number of times for which power ramping was performed in the random access procedure.

Abstract: A network node includes a receiving unit that receives a message of a higher layer from a user equipment, a control unit that determines a higher network node to which the message of the higher layer is to be transmitted from a plurality of higher network nodes that terminate and split a higher layer, and a transmitting unit that transmits the message of the higher layer to the determined higher network node.

Abstract: A gNB (200) includes a receiving unit (203) that receives a plurality of TSN times (T1, T2, and T3); a control unit (205) that associates a time identifier (TSN1, TSN2, and TSN3) with each of the plurality of TSN times (T1, T2, and T3); and a transmitting unit (201) that transmits the plurality of TSN times (T1, T2, and T3) and the time identifier (TSN1, TSN2, and TSN3) associated with each of the plurality of TSN times (T1, T2, and T3) to a UE (100). Each TSN time (T1, T2, and T3) is a time reference in the TSN (20a, 20b, and 20c).

Abstract: A network node includes a receiving unit that receives information related to a protocol version of a message of a higher layer and a control unit that uses a same protocol version for a plurality of higher network nodes that terminate and split the higher layer, based on the information related to the protocol version, in which the network node is one of the plurality of higher network nodes.

Abstract: A network node includes a receiving unit that receives information indicating whether or not predetermined information is to be transmitted to a lower network node and a transmitting unit that transmits the predetermined information to the lower network node based on the information indicating whether or not the predetermined information is to be transmitted to the lower network node, in which the network node is one of a plurality of higher network nodes that terminate and split a higher layer.

Abstract: When RRC connection release in a radio resource control layer reaches UE (200A), gNB-DU (110) transmits UE CONTEXT RELEASE COMPLETE of the UE (200A) to gNB-CU (120). The gNB-CU (120) releases a context allocated to the UE (200A) based on the UE CONTEXT RELEASE COMPLETE.

Abstract: A network node is a first network node of a communication system including a user device and a plurality of network nodes, the network node including a reception unit that receives an inter-node message relating to a configuration of the user device from a second network node; a determination unit that determines whether a manner of updating the configuration of the user device is a full configuration or a delta configuration based on the inter-node message; and an updating unit that updates the configuration of the user device with the full configuration or the delta configuration based on the determination.

Abstract: A communication device is disclosed including a communication unit configured to receive a message including an SCG configuration, wherein the communication unit transmits a message, which does not include the SCG configuration, to another communication device and causes the another communication device to perform full configuration. In other aspects, another communication device and a communication method are also disclosed.

Abstract: A network node in a wireless communication system comprising a user equipment and a plurality of network nodes, comprises: a reception unit for receiving from another network node or a user equipment a protocol data unit related to packet transmission that has a possibility of a plurality of data lengths with respect to sequence numbers; an acquiring unit for acquiring a sequence number of the protocol data unit related to packet transmission; and a notification unit for carrying out, based on the sequence number as acquired, notification related to packet transmission.

Abstract: A base station apparatus is a second base station apparatus for communicating with a first base station apparatus, the second base station apparatus including a receiving unit that receives, from the first base station apparatus, resource coordination information used to allocate a radio resource; a control unit that allocates a radio resource based on the resource coordination information; and a transmitting unit that transmits resource coordination information to the first base station apparatus, wherein the resource coordination information includes information indicative of at least one of a frequency domain and a time domain indicating a location of the radio resource.

Abstract: A central unit (210) acquires, from a user device (300) via a radio resource control layer, UE Capability indicative of a capability of the user device (300). The central unit (210) forwards the acquired UE Capability to a distributed unit (260). The distributed unit (260) holds parameters for controlling radio communication beforehand and receives the UE Capability forwarded by the central unit (210). The distributed unit 260 determines, based on the received UE Capability, content of the parameters according to the content of the UE Capability.

Abstract: In a radio communication system, a split bearer that passes from a core network to a secondary cell group and branches from gNB 100B included in the secondary cell group to eNB 100A included in a master cell group is set, and data is transmitted to a user equipment via thus set split bearer. The gNB 100B transmits, to the eNB 100A, Use of SCG Radio Resource that indicates whether to configure a split bearer that uses a radio resource between the user equipment and the gNB 100B. The eNB 100A sets the split bearer based on the received Use of SCG Radio Resource.

Abstract: Disclosed is a second base station device communicating with a first base station device. The second base station device includes a receiver configured to receive, from the first base station device, information for limiting radio resource allocation; a controller configured to allocate a radio resource based on the received information for limiting radio resource allocation; and a transmitter configured to transmit information for limiting radio resource allocation to the first base station device. The information for limiting radio resource allocation includes information indicating at least one of a frequency domain and a time domain indicating a location of a radio resource.

Abstract: A communication apparatus used as a first communication apparatus in a radio communication system including the first communication apparatus and a second communication apparatus, comprising a communication unit configured to receive a retransmitted packet addressed to a user equipment from the second communication apparatus, and to transmit the retransmitted packet to the user equipment, the communication unit transmitting delivery status information including a sequence number of the retransmitted packet to the second communication apparatus.

Abstract: A first communication apparatus includes a reception unit configured to receive information about uplink quality of user equipment from a second communication apparatus, when the user equipment communicates with both the first communication apparatus and the second communication apparatus; and a control unit configured to control uplink data transmission by the user equipment based on the information about uplink quality.

Abstract: A central unit (210) holds a plurality of parameters for controlling radio communication. A distributed unit (260) also holds a plurality of parameters for controlling the radio communication. A radio base station manages the parameters to be held by the central unit (210) and the distributed unit (260). The radio base station causes a coordination necessary parameter, which is a parameter for which a coordination is necessary between the plurality of the parameters, to be held in only one of the central unit (210) and the distributed unit (260).

Abstract: A network node that is a second network node connected to a user device and a first network node includes: a control unit that acquires information regarding a layer which is terminated at the user device and the second network node; and a transmission unit that transmits the information regarding the layer to the first network node. The layer is not terminated at the user device and the first network node.

Abstract: In one aspect of the present invention, a first base station for communicating with user equipment together with a second base station according to dual connectivity includes a data storage unit configured to store data to be transmitted from the first base station to the user equipment; a reception unit configured to receive from the second base station information indicating whether data to be transmitted from the second base station to the user equipment exist; and a state control unit configured to, when information indicating that data to be transmitted from the second base station to the user equipment exist is received, prevent the user equipment from releasing a radio resource or transitioning to a discontinuous reception state, even if the amount of to-be-transmitted data stored in the data storage unit is less than or equal to a predetermined threshold.

Abstract: A central unit (210) acquires, from a user device (300) via a radio resource control layer, UE Capability indicative of a capability of the user device (300). The central unit (210) forwards the acquired UE Capability to a distributed unit (260). The distributed unit (260) holds parameters for controlling radio communication beforehand and receives the UE Capability forwarded by the central unit (210). The distributed unit 260 determines, based on the received UE Capability, content of the parameters according to the content of the UE Capability.