Abstract:
Disclosed is a technique for switching from a master node to a secondary node in a communication system. A method of a first communication node may comprise: adding the first communication node as a primary secondary cell (PSCell) to a second communication node through dual connectivity (DC); generating a first user plane path for smart dynamic switching (SDS) and a first instance for supporting the first user plane path according to a request from the second communication node; transmitting information on the first user plane path and the first instance to a terminal; receiving user data based on the first user plane path from the terminal as the first instance; and transmitting the user data to a core network using the first user plane path.
Abstract:
Provided are an apparatus and a method for processing signal in a multiple access mobile communication system based on multiple beams, and a multiple access mobile communication system based on multiple beams. The apparatus includes: a modulating unit modulating a common control signal and a traffic data signal to be transmitted to a plurality of respective communication terminals; a mapping unit mapping the common control signal and the traffic data signal modulated by the modulating unit to subcarriers, respectively; a phase shifting unit phase-shifting the common control signal mapped to the subcarrier as long as a delay time designated to correspond to the plurality of communication terminals; and a Fourier transforming unit generating a transmission signal corresponding to each communication terminal by Fourier-transforming the respective subcarriers to which the common control signal and the traffic data signal phase-shifted as long as the designated delay time are mapped.
Abstract:
An operation method of an IAB node in a communication system may comprise: measuring a power difference between a first signal received from a first node and a second signal received from a second node; controlling a transmit power of each of the first node and the second node based on the power difference; generating scheduling information for allowing the first node and the second node to simultaneously transmit signals; transmitting the scheduling information to the first node and the second node; and receiving signals that the first node and the second node simultaneously transmit according to the scheduling information by using the transmit power.
Abstract:
Disclosed are a load modulation-based beamspace MIMO transmission method and apparatus. The beamspace MIMO transmission apparatus may include a plurality of impedance loading circuits each including a plurality of imaginary impedance devices, a beamspace MIMO control unit calculating loading values of the plurality of imaginary impedance devices, corresponding to a spatial multiplexing orthogonal frequency division multiplexing (OFDM) sample, and an RF chain unit generating a first signal having a predetermined carrier frequency.
Abstract:
An apparatus for allocating a broadcasting channel in each cell determines a position to which the broadcasting channel is to be allocated using a number of cell IDs and a cell ID of each cell which is allocated different from neighboring cells in a subframe of a downlink frame, and allocates the broadcasting channel to the determined position.
Abstract:
A method of a reconfigurable intelligent surface (RIS) node may comprise: receiving, from a first transmitting node, control information for controlling the first RIS node; grouping reflecting elements of the first RIS node into at least one reflecting element group using the control information; and transmitting at least one signal incident on the at least one reflecting element group to a receiving node.
Abstract:
A method and an apparatus for random access in a mobile communication system are provided. A terminal receives a synchronization signal block, obtains beam index information from the received synchronization signal block, and transmits a preamble message occupying a plurality of preamble resources including a preamble resource corresponding to the beam index information to a base station. A random access resource includes a plurality of preamble resources, and the synchronization signal block is specified for one beam and corresponds to one preamble resource of the random access resource.
Abstract:
Disclosed herein are an apparatus and a method for receiving uplink data to determine whether to use a reception beam group in reception of the uplink data on the basis of a preamble for a random access or a CQI included in a feedback.
Abstract:
Disclosed are a relay method and device in a communication system. An operation method of a first communication node comprises the steps of: transmitting a reference signal to one or more candidate R nodes; receiving first feedback information including a minimum value of a first RSRP from a first candidate R node belonging to the one or more candidate R nodes; receiving second feedback information including a minimum value of a second RSRP from a second candidate R node belonging to the one or more candidate R nodes; comparing a first value based on the first feedback information with a second value based on the second feedback information; when the first value is greater than the second value, selecting the first candidate R node as an R node that is to perform a relaying operation; and communicating with a second communication node via the R node.
Abstract:
An operation method of an IAB node in a communication system may comprise: measuring a power difference between a first signal received from a first node and a second signal received from a second node; controlling a transmit power of each of the first node and the second node based on the power difference; generating scheduling information for allowing the first node and the second node to simultaneously transmit signals; transmitting the scheduling information to the first node and the second node; and receiving signals that the first node and the second node simultaneously transmit according to the scheduling information by using the transmit power.