摘要:
Disclosed are a data transmission/reception apparatus and method of a wireless communication system using a relay. The data transmission/reception apparatus of the relay sets a relay reception subframe (hereinafter, referred to as ‘relay-rx-sub-frame’), and reports, to a terminal within a cell coverage, that the set relay-rx-subframe is a Multicast Broadcast Single Frequency Network (MBSFN) sub-frame, so that a legacy terminal may be provided with services in a wireless communication system using the relay.
摘要:
A method of managing a terminal and controlling an interference in a small base station is provided. The small base station, including: an access preamble control unit to assign a unique preamble for each terminal registered in the small base station; a transmitting/receiving unit to receive a random access request message from each of the terminals through the unique preamble, to transmit a reply message to each of the terminals, and to receive information about each of the terminals and a Radio Resource Control (RRC) connection request Message from each of the terminals in response to the reply message; and a terminal verification unit to verify whether each of the terminals is a registered terminal using the information about each of the terminals.
摘要:
A method of transmitting and receiving a control channel in a wireless communication system is provided. A base station allocates a data channel to a radio resource, adds start position information of the data channel into a payload of a control channel, and performs signaling for indication information on the start position information added into the payload of the control channel to a terminal. Accordingly, the legacy system and the enhanced system can efficiently transmit a control channel.
摘要:
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.
摘要:
A transmission apparatus includes a layer mapper to map a modulated symbol to a plurality of layers, a layer shifter to uniformly divide the symbol mapped to each of the plurality of layers, in a plurality of time domain streams, and a signal transmission unit to perform a DFT on each of the plurality of time domain streams to generate a plurality of frequency domain streams, and to transmit, to a receiving apparatus. The plurality of frequency domain streams are using a plurality of antennas corresponding to each of the plurality of frequency domain streams.
摘要:
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.
摘要:
Disclosed is a method for controlling interference in a heterogeneous network environment. The method for controlling the inter-cell interference of a base station according to one aspect of the present invention comprises the following steps: transmitting, to a terminal, information relating to subframes in which a portion of a resource is to be punctured; transmitting, to the terminal, a relevant subframe in which a portion of a resource is punctured on the basis of the information relating to said subframes. A method for controlling the inter-cell interference of a base station according to another aspect of the present invention comprises the following steps: setting a resource for transmitting system information; and transmitting system information using only said resource for transmitting system information, or preferentially using said resource for transmitting system information when transmitting system information using a subframe designated as an almost blank subframe (ABS). Accordingly, inter-cell interference problems may be alleviated even in the event pieces of important system information, such as CRS, should be transmitted using an ABS.
摘要:
Disclosed is a method for generating and transmitting a reference signal in a clustered DFT-spread OFDM transmission scheme. A method for generating and transmitting a DM-RS in a clustered DFT-spread-OFDM scheme comprises: a step of generating DM-RS sequences corresponding to the number of clusters allocated for an uplink transmission; and a step of mapping the generated DM-RS sequences to the relevant DM-RS symbol positions for each cluster. Accordingly, the method for generating and transmitting a reference signal according to the present invention, in which DM-RS sequences are allocated and transmitted on a cluster basis, uses a complete DM-RS sequence for each cluster, and therefore inter-cell interference can be weakened, and problems which might occur when applied to a multi-user MIMO (MU-MIMO) scheme can be solved.
摘要:
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.
摘要:
An inter-cell interference mitigation method in an orthogonal frequency division multiple access (OFDM)-based cellular system includes: dividing wireless resources into a resource group for fractional frequency reuse and a resource group for removing inter-cell interference; and re-dividing the resource group for fractional frequency reuse into particular resource groups numbering the same as a number of cell types of fractional frequency reuse, and applying a maximum transmission power to a particular resource group according to a cell type for fractional frequency reuse.