Abstract:
Disclosed are a method for checking whether D2D communication between devices for performing D2D communication is possible, and a method for estimating the proximity of devices to base stations and the proximity of devices to one another for reusing wireless resources in device-to-device communication and terminal relay communication. The method according to the present invention may enable the verification of whether D2D communication is possible between devices to establish a D2D connection, and may enable the wireless resources allocated to a cellular link and to other D2D links to be reused. Further, the method of the present invention may enable variations in a link state caused by terminal mobility to be handled, as well as D2D communication between new UEs and D2D communication between a new UE and a legacy UE, to be handled.
Abstract:
Provided is a wireless multi-carrier code division multiplexing communication apparatus that may transmit data using a transmit diversity scheme. A transmission apparatus may include: a space-time coding unit (340) to perform space-time encoding of transmission data to generate a plurality of data streams: a radio resource code generation unit(320) to generate a radio resource code vector by referring to radio resource allocation information associated with a reception apparatus; a signal generation unit (350) to generate a plurality of code division multiplexing signals corresponding to a plurality of transmit antennas (370) respectively, by muiltiplying the radio oplurality of code division multiplexing signals to the reception apparatus via the plurality of transmit antennas. Accordingly, it is possible to effectively transmit data using a transmit diversity scheme in a wireless multi-carrier code division multiplexing communication system.
Abstract:
Disclosed is a method for enhancing a small cell. A method for enhancing a small cell in a terminal applying inter-site CA includes the steps of: causing a terminal to transmit the uplink control information (UCI) of at least one of the macro cells controlled by a macro cell base station through the macro cell; and causing the terminal to transmit the uplink control information of at least one of the small cells controlled by a small cell base station through the small cell.
Abstract:
Disclosed are a distributed antenna wireless communication system and a method thereof. The present invention provides a method for transmitting and receiving a physical channel and a reference signal by using a plurality of points in a distributed antenna wireless communication environment in which the plurality of points have mutually different physical layer cell IDs or the plurality of points belong to a same cell and have the same physical layer cell ID; provides a method for transmitting the physical channel and the reference signal from an uplink and a downlink by introducing a virtual cell ID; and is capable of improving communication efficiency of the distributed antenna wireless communication system by providing a coordinated transmitting method which uses the plurality of points.
Abstract:
Disclosed is a method for transmitting and receiving control information. The method for transmitting control information according to the present invention, in a mobile communication system in which a control channel region and a data channel region are separated from each other, comprises the steps of: determining a control channel resource for transmitting control information by means of the data channel region; and transmitting the control information using the determined control channel resource. According to the present invention, a capacity for control information, which increases for multiple user multiple-input multiple-out (MIMOs) in a heterogeneous network environment, for heterogeneous network interference control using carrier aggregation, for frequent use of a multicast-broadcast single frequency network (MBSFN) subframe, and for a CoMP transmission control, may be satisfied. Further, an adaptive resource allocation based on a requested capacity for control information may be enabled, and the efficient utilization of resources may also be enabled.
Abstract:
The present invention relates to a method and apparatus for constructing a control channel and transceiving data in a wireless communication system. User equipment monitors physical downlink control channel (PDCCH) candidates which are CRC-scrambled by a cell-radio network temporary identifier in a common search space and in a user equipment-specific search space. The user equipment regards that only the desired PDCCH is transmitted in the common search space if the PDCCH candidates have a common payload size and same index of first control channel elements, thus overcoming problems of ambiguity in detection of DCI.
Abstract:
Provided is a communication system for a multi-cell cooperative communication. A serving base station and at least one neighboring base station may communicate with at least one terminal through mutual cooperation. Each of the serving base station and the at least one neighboring base station may shift a phase of at least one element among elements included in a precoding matrix, using a phase shift matrix, and precode at least one data symbol. A terminal may feed back preferred phase shift matrix information to the serving base station, so that the serving base station and the at least one neighboring base station may adaptively determine a phase shift matrix. The terminal may calculate the phase shift matrix with small calculation amounts. The serving base station, the at least one neighboring base station, and the terminal may pre-store a plurality of candidate matrices with respect to the phase shift matrix.
Abstract:
The present invention relates to a method of generating a downlink frame. The method of generating the downlink frame includes generating a first sequence and a second sequence for identifying cell groups; generating a first scrambling sequence and a second scrambling sequence that are one-to-two mapped to the sequence number of the primary synchronization signal; scrambling the first sequence with the first scrambling sequence and scrambling the second sequence with the second scrambling sequence; and generating a secondary synchronization signal including the scrambled first sequence and second sequence and mapping the secondary synchronization signal to a frequency domain.
Abstract:
Provided is a precoding matrix design method for a cooperative communication of multiple base stations in a multiple input multiple output (MIMO) communication system. A method of designing a precoding matrix in a base station of the MIMO communication system may include: determining whether to use a cooperative communication; verifying a cooperative base station when the cooperative communication is determined to be used; selecting a precoding matrix to be applied by a home base station and the cooperative base station; and requesting the home base station and the cooperative base station for the cooperative communication using the selected precoding matrix.
Abstract:
Disclosed are a distributed antenna wireless communication system and a method thereof. The present invention provides a method for transmitting and receiving a physical channel and a reference signal by using a plurality of points in a distributed antenna wireless communication environment in which the plurality of points have mutually different physical layer cell IDs or the plurality of points belong to a same cell and have the same physical layer cell ID; provides a method for transmitting the physical channel and the reference signal from an uplink and a downlink by introducing a virtual cell ID; and is capable of improving communication efficiency of the distributed antenna wireless communication system by providing a coordinated transmitting method which uses the plurality of points.