Abstract: A method for transmitting a signal in a multi-antenna system is provided. The method includes designating an analog beam to a plurality of generated modulation symbol sequences corresponding to a plurality of antenna ports, for each antenna port of the plurality, multiplexing signals, to which a beam is designated by the beam assignment, to a plurality of beam groups each having the same antenna beam combination, mapping beam group signals generated by the beam multiplexing, to at least one Orthogonal Frequency Division Multiplexing (OFDM) symbol and time and frequency resources, generating OFDM symbol signals corresponding to one or more antenna beams by OFDM-converting the beam group signals according to the resource mapping, converting the OFDM symbol signals into analog Radio Frequency (RF) signals, and transmitting the analog RF signals via a plurality of antenna elements by carrying the analog RF signals on associated antenna beams by analog beamforming.

Abstract: A method for mitigating interference at a small base station in a hierarchical cell structure is provided. In the method, the small base station checks a sub-frame allocated to macro user equipment by using a downlink signal received from a macro base station when an interference candidate user equipment list is received. The interference candidate user equipment list contains information on the macro user equipment adjacent to a femto cell controlled by the small base station. Then the small base station allocates other sub-frame to femto user equipment located in the femto cell by avoiding the sub-frame allocated to the macro user equipment.

Abstract: The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as long term evolution (LTE). According to the present disclosure, a method for providing a connection with a radio access network via a wireless backhaul comprises determining one of a first state in which a first node connected with the radio access network is operated using all of beams and a second state in which the first node is operated using an beam of the first node determined in the first state as an operation mode of the first node and providing, by the first node, the connection with the radio access network to a radio access node in the determined operation mode.

Abstract: A method for operating a Base Station (BS) in a wireless communication system capable of supporting a Peer-to-Peer (P2P) communication is provided. The method includes receiving at least one response message from at least one Mobile Station (MS) that has received a request message from a first MS and determining whether to allow the first MS to performs the P2P communication with a second MS based on the at least one response message.

Abstract: A method and apparatus for transmitting and receiving a signal of Random Access Channel (RACH) in a wireless communication system using beamforming are provided. The reception method includes receiving the signal through each transmission beam of a transmitter from a transmitter, transmitted in each transmission beam by the transmitter, the signal including as many repeated symbols as a total number of reception beams of a receiver, and detecting symbols by switching to reception beams corresponding to the symbols included in the signal during reception of the signal.

Abstract: The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). A method of a terminal includes acquiring frame synchronization for a serving base station in a first slot period within a first frame and searching a neighbor cell in a second slot period within a second frame.

Abstract: A scheduling method for beamforming in a mobile communication system is provided. The scheduling method includes determining whether to transmit an aperiodic second training signal, using first feedback information for a first training signal that is periodically transmitted, the first feedback information being received from at least one Mobile Station (MS), and upon determining to transmit the second training signal, transmitting the second training signal to MSs selected using the first feedback information, and performing scheduling on DownLink (DL) data based on second feedback information for the received second training signal.

Abstract: A method for mitigating interference at a small base station in a hierarchical cell structure is provided. In the method, the small base station checks a sub-frame allocated to macro user equipment by using a downlink signal received from a macro base station when an interference candidate user equipment list is received. The interference candidate user equipment list contains information on the macro user equipment adjacent to a femto cell controlled by the small base station. Then the small base station allocates other sub-frame to femto user equipment located in the femto cell by avoiding the sub-frame allocated to the macro user equipment.

Abstract: A system and a method minimize power consumption, signalling overhead, and processing load in blind scheduling in a mobile communication system. A User Equipment (UE) detects a type of an uplink (UL) grant while it is periodically allocated the UL grant. If there is no data to transmit using the UL grant, the UE determines whether to transmit a padding Medium Access Control (MAC) Protocol Data Unit (PDU) to an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) Node B (eNB) using the UL grant according to the type of the UL grant.

Abstract: An apparatus and a method for managing an access mode of an NB in a wireless communication system. The method includes receiving, from a first NB, a request to change the access mode of the second NB from a first mode into a second mode; determining, by the CN, to change the access mode of the second NB into the second mode; transmitting, to the second NB, a request message requesting to change the access mode of the second NB; and receiving, from the second NB, a response message informing of an access mode control result. If the first mode allows access only to terminals having a registration in the second NB, and the second mode allows access to terminals, the second NB further grants access to at least one terminal not registered in the second NB, after changing the access mode.

Abstract: An apparatus and method for downlink scheduling in a multi antenna wireless communication system are provided. The apparatus includes a receiver for receiving channel information of at least one mobile station that is selected as an active user by a base station, a judgment unit for judging whether it feeds back its own channel information using the channel information of the selected at least one mobile station, and a transmitter for transmitting the its own channel information to the base station according to judgment of the judgment unit.

Abstract: A method and apparatus for multi-cell cooperative transmission are provided, for increasing the capacity of an MS at a cell edge through cooperation among a plurality of adjacent cells or BSs each having a plurality of antennas. The present invention improves Coordinated Multi Point (CoMP) performance due to simple CoMP implementation and reduced backhaul overhead and delay, and enables simple implementation of a CoMP resource allocation process and reduces handover overhead by eliminating handover between CoMP processing units.

Abstract: A scheduling method for beamforming in a mobile communication system is provided. The scheduling method includes determining whether to transmit an aperiodic second training signal, using first feedback information for a first training signal that is periodically transmitted, the first feedback information being received from at least one Mobile Station (MS), and upon determining to transmit the second training signal, transmitting the second training signal to MSs selected using the first feedback information, and performing scheduling on DownLink (DL) data based on second feedback information for the received second training signal.

Abstract: A system and a method minimize power consumption, signalling overhead, and processing load in blind scheduling in a mobile communication system. A User Equipment (UE) detects a type of an uplink (UL) grant while it is periodically allocated the UL grant. If there is no data to transmit using the UL grant, the UE determines whether to transmit a padding Medium Access Control (MAC) Protocol Data Unit (PDU) to an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) Node B (eNB) using the UL grant according to the type of the UL grant.

Abstract: According to one embodiment, a method of a base station configured to select a precoding mode in a mobile communication system. When channel estimate information is received from at least one terminal, the channel estimate information is collected, so that user grouping is performed according to one precoding scheme from among multiple precoding schemes. Individual user scheduling is performed according to each precoding scheme, so that a service candidate group set is generated. The selected precoding scheme is maximized according to a transmission capacity of a service candidate group set for each precoding scheme. Data is then transmitted to a determined candidate group set using the determined precoding scheme.

Abstract: A system and a method minimize power consumption, signalling overhead, and processing load in blind scheduling in a mobile communication system. A User Equipment (UE) detects a type of an uplink (UL) grant while it is periodically allocated the UL grant. If there is no data to transmit using the UL grant, the UE determines whether to transmit a padding Medium Access Control (MAC) Protocol Data Unit (PDU) to an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) Node B (eNB) using the UL grant according to the type of the UL grant.

Abstract: An apparatus and a method for scheduling and a power control of a relay system that is capable of stable operation an environment where sufficient isolation between antennas is not ensured. The apparatus includes a scheduler for allocating resources to a zone not experiencing inter-antenna interference in an initial resource allocation, classifying users based on vulnerability to the interference, and allocating resources to a zone experiencing the interference, and a power controller for setting the resources of the zone experiencing the interference to a lower power than the resources of the zone not experiencing the interference to minimize the inter-antenna interference.

Abstract: An apparatus and a method for selecting a beam in a wireless communication system capable of forming a plurality of antenna beams are provided. The method for transmitting signals includes transmitting a training signal by using a plurality of first beams and a plurality of second beams, and transmitting at least one of user control information and data by using at least one fourth beam among a plurality of third beams.

Abstract: A method and an apparatus for supporting connectivity of Peer-to-Peer (P2P) communication in a mobile communication system are provided. An operating method of a Mobile Station (MS) for providing the connectivity of the P2P communications in the mobile communication system includes connecting P2P communications by searching for a correspondent MS in a first Base Station (BS), determining whether a direct P2P communication is feasible with the correspondent MS in the P2P communications and, when the direct P2P communication is not feasible, setting a P2P relay using the first BS.

Abstract: A handover apparatus and method in a communication system having a macro BS and a plurality of micro BSs in one cell are provided. A handover apparatus includes a macro BS for generating a plurality of messages, each messages respectively corresponds to one of a plurality of group areas defined by grouping service areas of the micro BSs and includes information about BSs to which MSs of the group area can perform handover. The macro BS also generates group area information indicating locations of the group areas, broadcasts the plurality of messages and the group area information to the cell, and manages handover of MSs based on the plurality of messages and the group area information.