摘要:
An operation method of a terminal in a communication system may comprise: in response to occurrence of uplink (UL) data, transmitting a scheduling request (SR) for the UL data to a base station; performing a UL timing alignment procedure with the base station when a UL timing between the terminal and the base station is not synchronized; receiving a UL grant for the UL data from the base station; and transmitting the UL data to the base station using resources indicated by the UL grant.
摘要:
A method of an integrated access and backhaul (IAB) node may include: receiving, from a target base station, one or more user equipment (UE) context setup request messages including terminal radio resource reconfiguration information; sharing context information including the terminal radio resource reconfiguration information with a source IAB-distributed unit 1 (IAB-DU1); configuring terminal reconfiguration information using the shared context information; and transmitting one or more UE context setup response messages including the terminal reconfiguration information to the target base station in response to the one or more UE context setup request messages.
摘要:
A random access method performed by a communication node may comprise: receiving RACH configuration information; measuring a distance between a base station and a terminal or a signal characteristic value corresponding to the distance between the base station and the terminal; determining a timing offset value to be applied to random access preamble transmission using the signal characteristic value, preset threshold value, and preset timing offset value; and transmitting a random access preamble generated on the basis of the RACH configuration information to the base station, wherein the threshold value and the timing offset value are included in the RACH configuration information.
摘要:
A method of an IAB node may comprise: receiving an RRC message including measurement control information from a base station; transmitting RRC reconfiguration information including the measurement control information to each of a plurality of terminals; receiving a measurement report message including a measurement report generated by each of the plurality of terminals based on the measurement control information from each of the plurality of terminals; and grouping the measurement report messages received from the plurality of terminals into a grouped message report message, and transmitting the grouped measurement report message to the base station according to a grouped measurement reporting periodicity.
摘要:
A method of an aerial vehicle for urban air mobility may include: reporting, to a first base station, a measurement result for neighboring base stations including a second base station; receiving, from the first base station and as a processing result based on the measurement result, an indication of a failure of a handover to the second base station; requesting, to a control station, first location information indicating a first location to move according to the failure of the handover; receiving the first location information from the control station; and moving according to the received first location information.
摘要:
A method of providing service continuity between cellular communication and device-to-device communication is disclosed. A procedure for switching between cellular communication and device-to-device communication according to an example embodiment of the present invention may include transferring, by a gateway, a D2D bearer creation request message to an MME, transferring, by the MME, the D2D bearer creation request message to a base station, mapping, by the base station, D2D bearer QoS to D2D radio bearer QoS and transmitting an RRC connection reconfiguration message to terminals, receiving, by the base station, an RRC connection reconfiguration completion message indicating creation of a D2D radio bearer from the terminals, transmitting, by the base station, a D2D bearer creation response message indicating creation of a D2D bearer to the MME, and transferring, by the MME, the D2D bearer creation response message to the gateway.
摘要:
A method of a terminal, according to an exemplary embodiment of the present disclosure, may include: requesting access to a mobile integrated access backhaul (IAB) based on cell search; receiving a tracking area (TA) update procedure stop request message from an Access and Mobility Management Function (AMF) of a core network; and deactivating a TA update procedure based on the TA update procedure stop request message.
摘要:
A method for setting synchronization between terminals performing device-to-device (D2D) communication based on a cellular communication system is disclosed. The method for setting synchronization between terminals includes receiving a message instructing synchronization setting with an opposite terminal from a base station, selecting a first preamble transmitted for a synchronization setting with the opposite terminal based on the message instructing synchronization setting, transmitting the selected first preamble to the opposite terminal, receiving a second preamble from the opposite terminal, and setting the synchronization with the opposite terminal using a reception timing of the second preamble when the second preamble is a preamble designated in the message instructing synchronization setting. Thus, when the present invention is used, synchronization between two terminals performing direct communication may be set using a physical layer random access channel resource which has been used in an existing mobile communication system.