摘要:
Provided are a method and an apparatus for reporting a channel quality indicator (CQI) in a multi-node system. A terminal measures the CQI on the basis of a final interference power in which interference from at least one node among a plurality of nodes, from which the terminal receives signals, is reduced, and reports the measured CQI to a base station. Improvement of system performance, such as a data rate increase can be expected.
摘要:
Provided is a signal transmitting method of a terminal in a multi-node system including and configured to control a plurality of nodes and a base station connected to each of the plurality of nodes. The method includes: estimating a channel of at least one node by receiving a reference signal from at least one node among the plurality of nodes; selecting a preferred rank and a precoding matrix index by applying at least one precoding matrix to the estimated channel; selecting one of a plurality of codeword-layer mappings (CLMs) by applying a precoding matrix indicated by the rank and the precoding matrix index; and transmitting the selected rank, the selected precoding matrix index, and a CLM indicator to the base station.
摘要:
There is provided a method of determining a Modulation and Coding Scheme (MCS). The method includes predicting an error rate of a symbol and determining a MCS of the symbol using the error rate. Since a MCS level is determined using an estimated error rate and user data is scheduled, multi-user diversity gain can be obtained and the transmission rate can be improved.
摘要:
A method of transmitting channel quality indicator (CQI) includes obtaining CQI of each, of the plurality of sub-bands, selecting a first sub-band having the best CQI of the plurality of sub-bands, transmitting the best CQI of the first sub-band at a first transmission cycle and transmitting a difference value between the best CQI of the first sub-band and a CQI of the first sub-band at a second transmission cycle. Signalling overhead due to CQI transmission can be reduced.
摘要:
Provided are a method and apparatus for allocating resources in a multi-node system that includes a plurality of nodes and a base station connected to each of the nodes to control the nodes. The method comprises: partitioning radio resources into a node-common region and a node-specific region, and allocating the node-common region and the node-specific region to the plurality of nodes, wherein a common resource allocation scheme is applied to the plurality of nodes in the node-common region, and different resource allocation schemes are applied to the plurality of nodes in the node-specific region.
摘要:
Provided is a method for transmitting a signal in a multi-node system including a plurality of nodes, and a base station connected to each of the plurality of nodes for controlling the nodes. The method comprises the following steps: transmitting first node-setting information to a first terminal; transmitting second node-setting information to a second terminal; transmitting a signal to the first terminal through a first node group; and transmitting a signal to the second terminal through a second node group, wherein the first node-setting information and the second node-setting information include system parameters which are set differently for each terminal, and the first node group is determined on the basis of the first node-setting information, and the second node group is determined on the basis of the second node-setting information.
摘要:
Provided are a method and apparatus for transmitting a signal of a multi-node system employing a plurality of nodes distributed geographically and a base station that can be controlled by being connected with each of the plurality of nodes. The method includes: mapping a plurality of codewords to a plurality of streams; mapping the plurality of streams to at least one node among the plurality of nodes; performing multiple input multiple output (MIMO) precoding to map the streams mapped to the at least one node to at least one transmit antennas; and transmitting a signal subjected to the MIMO precoding to a user equipment.
摘要:
A method of transmitting feedback data in a multiple antenna system includes generating feedback data based on the channel information and transmitting the feedback data at transmission periods, wherein the feedback data is transmitted in a plurality of report types respectively having a different control signal type contained depending on the transmission periods.
摘要:
A method and apparatus for transmitting data having time diversity and data having time-frequency diversity, and a pattern generating method for the same are disclosed. The apparatus enables Tx data to have time diversity or time frequency diversity using a predetermined pattern multiplied by Tx data of a time domain or Tx data of time and frequency domains. The apparatus makes a cyclic delay diversity (CDD) scheme to have the diversity of time and frequency domains, and may acquire an additional diversity gain by a combination of the above-mentioned methods.
摘要:
A method for transmitting feedback information in a codebook-based multiple-input multiple-output (MIMO) system is disclosed. To transmit the feedback information, a signal is received to discern channel characteristics of the received signal, and a codebook is updated using an extended matrix including a plurality of vector components and using previous feedback information. Feedback information is selected for transmission from the updated codebook in consideration of the channel characteristics of the received signal.