Abstract: A communication control method is a method performed in a user equipment. The communication control method includes the steps of: when a random access procedure is performed for a base station operated in an unlicensed band in which LBT before transmission is required, transmitting a message to the base station and then receiving a response to the message from the base station; and controlling the number of transmission occasions that allow the message to be transmitted before the response is received. The controlling of the number of the transmission occasions includes, when a failure occurs in an n-th (n?1) random access procedure due to a failure of the LBT, causing the number of the transmission occasions in an (n+1)-th random access procedure to be larger than the number of the transmission occasions in the n-th random access procedure.

Abstract: A communication control method executed in a relay apparatus comprising a base station function processor, and a user equipment function processor, the communication control method including: receiving, by a MAC layer of the base station function processor, from the lower apparatus, a first buffer state report, notifying, by the MAC layer of the base station function processor, a MAC layer of the user equipment function processor, of an amount of first untransmitted upstream data; considering, by the MAC layer of the user equipment function processor, the amount of first untransmitted upstream data notified to be a part of an amount of upstream data queued in a MAC layer of the relay apparatus to calculate an amount of second untransmitted upstream data of the relay apparatus; and transmitting, by the MAC layer of the user equipment function processor, a second buffer state report.

Abstract: In the examples described herein, abase station transmits, to a remote UE device over a direct Uu communication link, an RRC Reconfiguration Message with Sync identifying a target relay UE device and explicitly or implicitly identifying a cell for reselection by the target relay UE device. The identified cell is provided by the base station, and the remote UE device is connected to the cell. The remote UE device transmits, to the target relay UE device over a PCS communication link, a PC5-RRC Message indicating the identified cell is the target cell. In response to receiving the PC5-RRC Message, the target relay UE device performs a cell reselection procedure that prioritizes the identified cell.

Abstract: A user equipment (UE) device receives, from base station providing a source cell, a conditional handover command identifying a target frequency on a target cell for conditional handover. After determining that conditions have been met for the conditional handover, the UE device observes the target frequency. If the target frequency is occupied, the UE device transmits, to the serving base station, an indication that the target frequency is unavailable for the conditional handover. The indication may include, or be transmitted with, a measurement report.

Abstract: A user equipment according to an aspect includes a processor. The processor executes: processing of attempting, in a predetermined period, reception of a reference signal periodically transmitted from a cell in an unlicensed band; processing of counting at least one of the number of unsuccessful receptions of the reference signal in the predetermined period and the number of successful receptions of the reference signal in the predetermined period; and processing of performing mobility control of the user equipment, based on the counted number.

Abstract: A communication control method according to one aspect is a communication control method in a mobile communication system. The communication control method includes the step of extending, at a user equipment, monitoring of a PDSCH or monitoring of a PDCCH for a predetermined period when not having received the PDSCH or the PDCCH from a base station at a Semi-Persistent Scheduling (SPS) periodicity timing or a Discontinuous Reception (DRX) periodicity timing.

Abstract: A mobile communication system includes a base station, a relay apparatus configured to relay a radio signal between the base station and a user equipment, and a control terminal configured to communicate with the base station and control the relay apparatus. The relay apparatus includes a plurality of elements used for beamforming. The control terminal performs, by grouping the plurality of elements into a plurality of groups, independent beam control for each of the plurality of groups. Information on the plurality of groups is communicated between the base station and the control terminal.

Abstract: A communication control method according to one aspect is a communication control method in a mobile communication system. The communication control method includes performing, at a base station, one of associating a first Semi-Persistent Scheduling (SPS) configuration and a second SPS configuration having different periodicities, or associating a first Configured Grant (CG) configuration and a second CG configuration having different periodicities. The communication control method includes transmitting, at the base station, first association information to a user equipment, the first association information relating to one of the association between the first SPS configuration and the second SPS configuration or the association between the first CG configuration and the second CG configuration.

Abstract: A communication control method according to one aspect is a communication control method in a mobile communication system. The communication control method includes the steps of, at a base station: transmitting, to a user equipment, a skip notification indicating that transmission of a transmission packet is skipped when the base station does not retransmit the transmission packet; and configuring, for the user equipment, a timer value of a high-speed retransmission timer having a shorter timer value than a reference timer when the base station retransmits the transmission packet.

Abstract: A control terminal for controlling a relay apparatus relaying a radio signal between a base station and a user equipment establishes a wireless connection to a network belonging to a first operator (PLMN) and a wireless connection to a network belonging to a second operator (PLMN). The control terminal controls the relay apparatus based on control received from the network by the control terminal and control received from the network by the control terminal.

Abstract: A base station, communication control method used in a base station, and mobile communication system including a base station transmit a handover request message for handing over a wireless communication apparatus having a RRC connection with the base station to another base station. The handover message includes an Integrated Access and Backhaul (IAB) indication indicating that the wireless communication apparatus is an IAB node having a user equipment function and a base station function.

Abstract: A slice-specific cell reselection method according to one aspect is a slice-specific cell reselection method for a mobile communication system. The slice-specific cell reselection method includes a step of receiving, at a user equipment, a slice priority indicating a priority per network slice from a base station or an access management apparatus. The slice-specific cell reselection method further includes a step of transmitting, at the base station, a slice priority disregard permission message indicating that disregarding a slice priority is permitted when an available capacity of a radio resource is greater than or equal to a threshold value. The slice-specific cell reselection method further includes a step of performing slice-specific cell reselection using the network slice desired by the user equipment without using a slice priority in response to reception of the slice priority disregard permission message.

Abstract: A communication apparatus configured to communicate with a communication apparatus in a mobile communication system using a machine learning technology, the communication apparatus including the receiver configured to receive, from the communication apparatus, a configuration message including a model and additional information on the model, the model being to be used in machine learning processing of learning processing and/or inference processing, and a controller configured to perform the machine learning processing using the model based on the additional information.

Abstract: A communication apparatus configured to communicate with a communication apparatus in a mobile communication system using a machine learning technology includes a controller configured to perform machine learning processing of learning processing to derive a learned model by using learning data and/or inference processing to infer inference result data from inference data by using the learned model, and a transmitter configured to transmit, to the communication apparatus, a message including an information element related to a processing capacity and/or a storage capacity usable by the communication apparatus for the machine learning processing.

Abstract: A slice support checking method according to an aspect is a slice support availability checking method in a mobile communication system. The slice support checking method includes a step of transmitting, at a base station, a message including a first list and/or a second list. Furthermore, the slice support checking method includes a step of determining, at a user equipment, whether a cell supports a network slice in an application area based on the presence or absence of the first list and the second list. Here, the first list represents first network slices that a cell supports, and the second list represents second network slices that the cell does not support.

Abstract: A communication control method according to one aspect is a communication control method in a mobile communication system. The communication control method comprises: transmitting, at a network node to a user equipment, configuration information relating to a transmission path through which extended Reality (XR) traffic is transmitted; and transmitting, at the user equipment to the network node, XR assistance information relating to the XR comprising identification information relating to the transmission path on a basis on the configuration information. The configuration information comprises association information between the identification information relating to the transmission path and a session ID of the XR.

Abstract: A communication control method according to a first aspect is a method used in a mobile communication system configured to form at least one communication path with a plurality of relay apparatuses between a user equipment and a donor apparatus. The communication control method includes: detecting, by a relay apparatus included in the plurality of relay apparatuses, a failure of a backhaul link between an upper apparatus higher than the relay apparatus and the relay apparatus; in response to the detecting of the failure in the backhaul link, transmitting, by the relay apparatus, a failure notification related to the failure of the backhaul link to a lower apparatus lower than the relay apparatus; and by the lower apparatus, in response to receiving the failure notification from the relay apparatus, stopping uplink transmission to the relay apparatus.

Abstract: A communication control method according to an embodiment is a method for controlling dual connectivity communication in which a user equipment simultaneously communicates with a master node and a secondary node. The communication control method includes detecting, by the user equipment, degradation of a radio link between the master node and the user equipment, starting, by the user equipment, a timer in response to detecting degradation of the radio link, the timer being for waiting for an indication from the master node, and transmitting, by the user equipment, a message indicating the degradation of the radio link, to the secondary node in response to the detecting of the degradation of the radio link, the message being transferred from the secondary node to the master node. The message includes timing information indicating a start timing for the timer.

Abstract: A method according to one embodiment is a method executed by a relay apparatus configured to: connect to a first upper apparatus; and have a function of relaying communication between the first upper apparatus and a lower apparatus. The method includes: detecting a connection failure with the first upper apparatus after starting the relaying; transmitting a reconnection request to a second upper apparatus which is a candidate of a reconnection destination of the relay apparatus in response to detection of the connection failure; receiving, from the second upper apparatus, in response to transmission of the reconnection request, a radio resource control, RRC, setup message indicating that not the reconnection but an RRC connection establishment has to be performed; and transmitting, to the second upper apparatus, information on behavior of the relay apparatus in response to reception of the RRC setup message.

Abstract: A radio measurement collection method is a method performed by a user equipment in a mobile communication system in which, in addition to a normal coverage, different enhanced coverages are formed for respective coverage enhancement levels. The radio measurement collection method includes storing, based on an enhanced coverage of the different enhanced coverages in which the user equipment is located, a measurement log including measurement information regarding a radio environment for the user equipment and position information regarding the user equipment, and transmitting, to a network, the measurement log stored.