Abstract:
In a wireless communication system in which a plurality of base stations each forming a directional beam in one direction are disposed along a predetermined path, each base station estimates a distance from installed in a mobile body moving along the path if the TE enters a cell area of the corresponding base station; and controls the transmission power using a distance from the estimated TE so that a difference between received signal strength of the corresponding base station and the received signal strength of neighboring base stations measured by the TE in a cell boundary area between the base stations does not exceed a predetermined threshold value.
Abstract:
A method of searching a cell in a mobile station of a communication system in which a plurality of cells are grouped into a plurality of cell groups, each cell group including at least two cells, includes: detecting a primary synchronization signal and a secondary synchronization signal from a received signal; and identifying a cell based on a combination of the primary synchronization signal and the secondary synchronization signal. The secondary synchronization signal is related to the cell group to which the mobile station belongs and the primary synchronization signal is related to the cell to which the mobile station belongs within the cell group.
Abstract:
Provided is a method for generating, by a base station, a common signal commonly required for surrounding terminals of the base station in a massive multiple input multiple output (MIMO) system. The base station generates data commonly required for the surrounding terminals. The base station generates a plurality of beamforming vectors using a time-domain constant amplitude (TCA)-frequency-domain constant amplitude (FCA) sequence having a constant size in a time domain and a frequency domain. Further, the base station generates a plurality of antenna streams corresponding to the common signal by multiplying the plurality of beamforming vectors by the data.
Abstract:
Provided are a method and apparatus for controlling a plurality of base stations disposed along the moving path of a moving group object, including determining a frame offset for the plurality of base stations based on a first delay time generated between the moving group object and the plurality of base stations and a second delay time generated between the plurality of base stations and the base station control device, and transferring data to be transmitted to the moving group object to the plurality of base stations based on the frame offset.
Abstract:
A method of and an apparatus therefor searching a cell in a mobile station of a communication system in which a plurality of cells are grouped into a plurality of cell groups, and each cell group includes at least two cells. The method includes detecting a primary synchronization signal and a secondary synchronization signal from a received signal, and identifying a cell based on a combination of the primary synchronization signal and the secondary synchronization signal. The secondary synchronization signal is related to the cell group to which the mobile station belongs and the primary synchronization signal is related to the cell to which the mobile station belongs within the cell group.
Abstract:
Disclosed are a method for configuring a radio frame, an apparatus for the same, a method for a mobile terminal to acquire synchronization with a base station, and a mobile terminal for the same. A method for configuring a radio frame, according to an example embodiment of the present invention, comprises generating a first synchronization signal and arranging the first synchronization signal in a slot for synchronization signal, generating a second synchronization signal and arranging the second synchronization signal in a predetermined position from the first synchronization signal, and constructing a radio frame including the first synchronization signal and the second synchronization signal. A plurality of secondary synchronization signals include difference sequences derived from a same sequence, and constitute hopping code with a predetermined hamming distance.
Abstract:
Provided are a method for handover of mobile apparatus, a communication device for the same, and a mobile apparatus using the same. A communication device of a mobile apparatus may comprise a first antenna unit, a second antenna unit, a first signal processing part receiving a handover command indicating to handover from a first beam which maintains connection with the mobile apparatus through the first antenna unit to a second beam, and storing information about the first beam, and a second signal processing part performing handover from a third beam which maintains connection with the mobile apparatus through the second antenna unit to the first beam by using the information about the first beam. Therefore, a procedure for handover to a new beam area may be simplified.
Abstract:
There are provided an antenna apparatus and a method of handover using the antenna apparatus. The antenna apparatus may comprise a plurality of antenna elements forming a plurality of beams in a predetermined service area. The plurality of antenna elements are arranged in a plurality of rows, and a number of antenna elements included in an uppermost row of the plurality of rows is smaller than a number of antenna elements included in a downmost row of the plurality of rows, and differences between center angles of beams formed by the antenna elements included in the downmost row are larger than differences between center angles of beams formed by the antenna elements included in the uppermost row.
Abstract:
Provided are a method of receiving downlink data and a machine type communication (MTC) device using the same. The MTC device according to the present invention which has a plurality of antennas includes a reception signal processing module that receives a downlink reference signal for each antenna from a base station, estimates reception signal quality with respect to the downlink reference signal for each antenna, and selects the antenna to receive a downlink signal in accordance with the reception signal quality with respect to each antenna.
Abstract:
Disclosed herein relates to a resource allocation method for a machine type communication (MTC) device. The resource allocation method for the MTC device includes allocating a control channel with respect to a user terminal to a first time domain of a sub frame, and mixing at least one of a control channel with respect to the at least one MTC device, a data channel with respect to the user terminal, and a data channel with respect to the MTC device in a second time domain of the sub frame, and allocating the mixed channel to the second time domain of the sub frame. Accordingly, in a wireless communication system, control information and data may be transmitted and received to and from the MTC device while maintaining compatibility with the user terminal.