Abstract: A communication control method according to a first aspect is a communication control method used in a cellular communication system. The communication control method includes transmitting, by a relay node that detects occurrence of a failure in a backhaul link between the relay node and a parent node of the relay node, a notification instructing execution of a conditional handover, and receiving, by a communication apparatus, the notification.

Abstract: Methods, apparatuses and systems for user equipment channel estimation, in accordance with some embodiments, includes: accessing a database storing a first plurality of locations, a first plurality of channels associated with respective ones of the first plurality of locations, and a first plurality of channel estimates associated with respective ones of the first plurality of channels; obtaining a second location of a first wireless communication device; determining a closest location from among the first plurality locations that has a closest distance to the second location; selecting a channel estimate from among the first plurality of channel estimates that corresponds to the closest location; determining a second channel estimate for the first wireless communication device based on the selected channel estimate; and adjusting at least one parameter of a signal transmitted between the first wireless communication node and the first wireless communication device based on the second channel estimate.

Abstract: The devices, systems, and methods described herein are directed to a procedure for automatically switching which cell serves as the Primary Cell (PCell) for a user equipment (UE) device connected to a network via two different communication paths. In some examples, the PCell transmits a message to the remote UE device, indicating one or more conditions that will trigger automatically switching from using a first cell as the PCell to using a second cell as the PCell. In response to one or more of the conditions that will trigger automatically switching being met, a procedure is performed to automatically switch from using the first cell as the PCell to using the second cell as the PCell. In some examples, the remote UE device will transmit a report to the PCell, indicating that one or more of the conditions that will trigger automatically switching has been met.

Abstract: The base station selects and instructs a reporting UE device to provide wide-beam precoder information indicative of a wide-beam precoder (W1). The base station tracks the locations of the reporting UE device and other UE devices and identifies at least one cluster UE device that is within a maximum distance from the reporting UE device. Without receiving wide-beam procedure information from the at least one cluster UE device, the base station applies a MU-MIMO precoder to transmissions through multiple antennas to the cluster UE device where the MU-MIMO precoder uses a wide-beam precoder (W1) based, at least partially, on the wide-beam precoder information received from the reporting UE device.

Abstract: A communication control method according to the first aspect is a method of using a relay apparatus configured to relay communication between an upper apparatus and a lower apparatus by radio. The communication control method includes a step of, in the relay apparatus, reporting, by a user equipment function unit connecting to the upper apparatus by radio, state information to a base station function unit connecting to the lower apparatus by radio. The state information is information indicating at least one state of an RRC state of the user equipment function unit or a radio link state between the upper apparatus and the user equipment function unit.

Abstract: Methods, apparatus and systems for user equipment positioning based on intelligent reflection surface are described. In one embodiment, a method performed by a first wireless communication node, includes: transmitting a respective one of a plurality of first signals to each of a first plurality of wireless communication nodes; transmitting a second signal to a wireless communication device, wherein the second signal comprises an indication to instruct the wireless communication device to reflect each of a plurality of third signals back towards a respective transmitting node using an Intelligent Reflecting Surface (IRS); transmitting a respective one of the plurality of third signals to the wireless communication device; and receiving a respective one of a plurality of first reports from a respective one of the first plurality of wireless communication nodes for positioning computation of the wireless communication device.

Abstract: A network node determines a location of a target terminal device and transmits a location-based CBL to the target terminal device. The location-based CBL comprises information identifying at least one reference signal. The target terminal device measures the at least one reference and conveys results of the measurements to the communication node. The network node applies a MU-MIMO precoder to transmissions through multiple antennas to the target terminal device where the MU-MIMO precoder is selected based, at least partially, on the results of the measurement of the at least one reference signal. In some embodiments, the location-based CBL is based, at least partially, on a precoder-to-region mapping comprising a plurality of region precoders mapped to a plurality of regions. The location-based CBL may further be based on the most recent precoder information received from a reporting neighbor terminal device that is within a maximum distance from the target terminal device.

Abstract: After determining a paging message is required for a selected user equipment (UE) device, an apparatus evaluates neighbor list data of a neighbor list generated by a reporting user equipment (UE) device to determine the selected UE device is a neighbor device of the reporting UE device. Based on information from the neighbor list, the apparatus determines that the selected UE device is located within a geographical area within a paging area where the geographical area includes a subset of the base stations within the paging area. The apparatus invokes transmission of the paging message only from the base stations in the geographical area without transmission of the paging message from other base stations within the paging area.

Abstract: A relay user equipment (UE) device transmits selected system information in a sidelink discovery message where the selected system information is a subset of system information received from a cell at the relay UE device. A remote UE device receiving the sidelink discovery message with the selected system information obtains at least system information for accessing the cell where such system information may not be available directly from the cell. The remote UE receiving select system information from each of a plurality of candidate relay UE devices manages relay selection/reselection at least partially based on the selected system information.

Abstract: A communication control method is used in a mobile communication system for providing a multicast broadcast service (MBS) from a base station to user equipment, and includes receiving, by the base station from a core network or another base station, a specific Packet Data Convergence Protocol (PDCP) sequence number specified to be applied to an MBS packet; associating, by the base station, the MBS packet with the specific PDCP sequence number; and transmitting, by the base station to the user equipment, the MBS packet associated with the specific PDCP sequence number.

Abstract: The devices, systems, and methods described herein are directed to scenarios in which a candidate relay UE device may have previous knowledge of a source UE device's interest in connecting to a specific target UE device, based on a previous request from the source UE device. If the candidate relay UE device determines that a sidelink connection between the candidate relay UE device and the target UE device meet the criteria for establishing a U2U relay connection between the source UE device and the target UE device, the candidate relay UE device should inform the source UE device without waiting for a next scheduled Model A transmission period.

Abstract: A communication method performed by a user equipment in a mobile communication system for providing a multicast/broadcast service (MBS) includes: receiving a paging message including a first list and a second list in a radio resource control (RRC) inactive state from a base station, the first list being a list of user equipment identifiers, and the second list being a list of MBS session identifiers; based on a user equipment identifier of the user equipment being comprised in the first list, initiating an RRC connection resume to transition from the RRC inactive state to an RRC connected state; and based on an MBS session identifier of a multicast session which the user equipment has already joined being included in the second list, recognizing activation of the multicast session already joined and maintaining the RRC inactive state.

Abstract: A communication method performed by user equipment in a mobile communication system that provides a multicast/broadcast service (MBS) includes: receiving, from a network node, a radio resource control (RRC) release message including configuration information of a multicast inactive multicast radio bearer (MRB) used for reception of a multicast session in an RRC inactive state, the RRC release message causing the user equipment to transition to the RRC inactive state; confirming whether the RRC release message includes state information regarding whether the multicast session has been activated; and starting a multicast reception process using the multicast inactive MRB based on the configuration information when the RRC release message does not include the state information.

Abstract: A communication control method according to an embodiment is a communication control method used in a mobile communication system providing a multicast broadcast service (MBS) from a base station to a user equipment. The communication control method includes, by the user equipment, specifying a broadcast session among MBS sessions in which the user equipment is interested, the broadcast session being an MBS session transmitted in a broadcast manner, and, by the user equipment, transmitting, to the base station, an MBS interest notification including identification information identifying the broadcast session specified.

Abstract: In a first aspect, a communication control method is used in a cellular communication system. The communication control method includes transmitting, by a donor base station with a first relay node and a second relay node as lower nodes of the donor base station, a trigger type for a pre-emptive buffer status report (pre-emptive BSR) to the second relay node being a parent node of the first relay node. The communication control method includes triggering, by the first relay node, the pre-emptive buffer status report to the second relay node in accordance with the trigger type.

Abstract: A communication control method according to an embodiment is a communication control method used in a mobile communication system for providing a multicast broadcast service (MBS) from a base station to a user equipment, the communication control method including transmitting, by the base station through broadcast signaling, an MBS configuration including at least information used for reception of a broadcast session; and transmitting, by the base station to the user equipment in a Radio Resource Control (RRC) connected state, at least a part of the MBS configuration through dedicated signaling.

Abstract: Methods, apparatuses and systems for user equipment channel estimation, in accordance with some embodiments, includes: accessing a database storing a first plurality of locations, a first plurality of channels associated with respective ones of the first plurality of locations, and a first plurality of channel estimates associated with respective ones of the first plurality of channels; obtaining a second location of a first wireless communication device; determining a closest location from among the first plurality locations that has a closest distance to the second location; selecting a channel estimate from among the first plurality of channel estimates that corresponds to the closest location; determining a second channel estimate for the first wireless communication device based on the selected channel estimate; and adjusting at least one parameter of a signal transmitted between the first wireless communication node and the first wireless communication device based on the second channel estimate.

Abstract: The devices, systems, and methods discussed herein facilitate the transition of a remote UE device and a relay UE device from either the RRCJDLE state or the RRCJNACTIVE state to the RRC_CONNECTED state in order to relay data. In some examples, in response to receiving a first Radio Resource Control (RRC) message from the remote UE device requesting connection to a base station, the relay UE device transmits an RRC connection request message to the base station. If the relay UE device receives a favorable RRC response message from the base station, the relay UE device transitions to the RRC_CONNECTED state with the base station and forwards the first RRC message to the base station. In some examples, the relay UE device transmits, to the remote UE device, a status update message to inform the remote UE device of the RRC response message received from the base station.

Abstract: A communication control method using a wireless relay apparatus connected to an upper apparatus via a backhaul link includes, in a case that a backhaul link of the wireless relay apparatus fails to be recovered, by the wireless relay apparatus, executing a first process for re-establishing a backhaul link of a lower wireless relay apparatus connected to the wireless relay apparatus by using a first message of a BAP layer of the wireless relay apparatus; and executing a second process for re-establishing or releasing an access link of a user equipment connected to the wireless relay apparatus by using a second message of a layer different from the BAP layer.

Abstract: In a first aspect, a communication control method is used in a cellular communication system. The communication control method includes transmitting, by a first relay node subordinate to a first donor base station, a first packet to a second donor base station different from the first donor base station. The communication control method includes forwarding, by the second donor base station, the first packet to the first donor base station by using a path for data forwarding, and transmitting, by the first donor base station, the first packet to a network.