Abstract: The present invention is designed to prevent the decrease of throughput and also reduce the overhead of CSI feedback when CoMP transmission is applied. A radio base station is configured to be able to perform coordinated multiple-point transmission/reception with a user terminal, and includes a detection section configured to detect a retransmission control signal fed back from the user terminal, and a CQI updating section configured to update a CQI for coordinated multiple-point transmission/reception using received quality information in each cell, and the CQI updating section updates the CQI using a calculating formula that is defined with the received quality information in each cell and a variable which changes the value depending on the content of the retransmission control signal.

Abstract: The present invention is designed to feed back a plurality of pieces of CSI with respect to each transmission point, when CoMP transmission is applied in the framework of carrier aggregation. The radio communication method according to the present invention is a radio communication method in a radio communication system including a plurality of radio base station apparatuses and a user terminal that is configured to be able to perform coordinated multi-point transmission/reception with the plurality of radio base station apparatuses, and, in this radio communication method, when coordinated multi-point transmission is applied, the radio base station apparatus, transmits CSI set information on a set including at least one CSI through higher layer signaling, and also transmits CSI request information in DCI, and the user terminal feeds back CSI based on the CSI set information and the CSI request information.

Abstract: The present invention is designed to, upon updating CQIs that are fed back, prevent the increase of the overhead of feedback information, and still improve the accuracy of the updated CQIs when CoMP transmission is applied. The radio communication system of the present invention is formed with a plurality of radio base station apparatuses and a user terminal that is configured to be able to perform coordinated multiple point transmission/reception with the plurality of radio base station apparatuses, and the user terminal acquires channel state information of multiple cells, generates feedback information such that the channel state information of multiple cells is allotted and transmitted in a plurality of subframes, and feeds back the generated feedback information to the radio base station apparatus of one of the multiple coordinated points, using a physical uplink shared data channel.

Abstract: The present invention provides a user equipment and channel state information feedback method. The channel state information feedback method used in a coordinated multi-point system includes acquiring small-scale channel state information H?=[H?1, H?2, . . . , H?K] between a user equipment and all base stations joining coordination, acquiring large-scale channel state information li(i=1, . . . , K) between the user equipment and each of the base stations joining coordination, acquiring a CQI (CQIi=li?|H?|, i=1, . . .

Abstract: The present invention is designed to suitably feed back each CoMP cell's channel state information when CoMP transmission is applied.

Abstract: The present invention is designed to prevent the increase of the overhead of feedback information, and furthermore improve the accuracy of updated CQIs, upon updating CQIs that are given as feedback, when CoMP transmission is applied. The radio communication system of the present invention is formed with a plurality of radio base station apparatuses and a user terminal that is configured to be able to perform coordinated multiple-point transmission/reception with the plurality of radio base station apparatuses and, in this radio communication system, the user terminal calculates a channel quality indicator for coordinated multiple-point transmission using an interference component ratio between cells and feeds back the channel quality indicator, and the radio base station apparatus re-calculates a channel quality indicator in accordance with a transmission mode of coordinated multiple-point transmission, using the channel quality indicator fed back from the user terminal.

Abstract: The present invention is designed to prevent the decrease of throughput and also reduce the overhead of CSI feedback when CoMP transmission is applied. In a radio communication system including a plurality of radio base station apparatuses and a user terminal that is configured to be able to carry out coordinated multiple-point transmission/reception with the plurality of radio base station apparatuses, the radio base station apparatus designates a plurality of candidate values of predetermined inter-cell channel state information and reports them to the user terminal, and the user terminal measures inter-cell channel state information of each cell, and also selects a specific candidate value that is close to the measurement value of inter-cell channel state information from the plurality of candidate values that have been reported, and feeds back the specific candidate value to the radio base station apparatus.

Abstract: The present invention is designed to provide a radio communication system, a radio base station apparatus and a radio communication method which can realize high transmission rate while reducing the calculation load involved in CoMP scheduling.

Abstract: To reduce overhead of CSI feedback without decreasing throughput in applying CoMP transmission, a radio communication method of the invention is characterized by including, in a user terminal measuring quality information for each of cells to perform Coordinated Multi-Point transmission, and notifying a radio base station apparatus of the quality information, in the radio base station apparatus calculating a quality difference between the cells to perform Coordinated Multi-Point transmission, by using the quality information for each the cells from the user terminal, determining granularity of inter-cell channel state information for each of the cells based on the quality difference, and notifying the user terminal of the granularity, and, in that the user terminal generating inter-cell channel state information for each of the cells according to the granularity from the radio base station apparatus, and transmitting the inter-cell channel state information for each of the cells to radio base station apparatu

Abstract: To reduce overhead of CSI feedback without decreasing throughput in applying CoMP transmission, a radio communication method of the invention is characterized in that a radio base station apparatus determines so that content of CSI to transmit to a serving cell to perform CoMP transmission as feedback is different from content of CSI to transmit to a coordinated cell as feedback, and notifies a user terminal of the content of CSI, and that the user terminal generates feedback information based on the content of CSI notified from the radio base station apparatus, and transmits the feedback information to radio base station apparatuses of cells that perform Coordinated Multi-Point transmission.

Abstract: The present invention is designated to improve received quality in a mobile terminal apparatus when coordinated multiple-point transmission (CoMP)—in particular, DCS-CoMP—is adopted. With the radio communication method of the present invention, when dynamic cell selection-type coordinated multiple-point transmission is adopted, a radio base station apparatus increases transmission power in radio resources to transmit to a mobile terminal apparatus, transmits the increased transmission power to the mobile terminal apparatus as transmission power information and performs dynamic cell selection-type coordinated multiple-point transmission at the increased transmission power.

Abstract: In order to recognize a relatively accurate channel state of each UE, a channel of the UE is reconfigured based on channel phase information and channel quality information reported from the UE to obtain a channel matrix of the UE. Besides, a channel of the UE is reconfigured based on channel phase information and channel quality information reported from the UE to obtain a channel matrix of the UE, a precoding matrix of the UE is determined based on the channel matrix of the UE, and precoding is performed on data to transmit to the UE, using the precoding matrix.

Abstract: The present invention is designed to provide a mobile terminal apparatus, a radio base station apparatus and a radio communication method which, even when a MIMO technique and a CoMP technique are applied together, can optimize the effects of both techniques. The mobile terminal apparatus estimates downlink channel states using reference signals included in downlink signals from a plurality of cells, determines the PMI for each cell and inter-cell phase difference information, from the channel states of the plurality of cells, such that the combinations of the PMI of each cell and inter-cell phase difference information become optimal, measures channel quality from the determined PMIs and inter-cell phase difference information, and transmits the PMI for each cell, the inter-cell phase difference information and channel quality information, to a radio base station apparatus.

Abstract: A base station receives channel state information corresponding to each of spare coordinated groups from each of user devices. A first group includes a plurality of coordinated groups arranged in advance. The spare coordinated groups corresponding to each user device are such as selected from the first group and include at least a service sector of best channel quality obtained measurement by the user device. The base station specifies a user device group corresponding to each of coordinated groups contained in each of coordinated group patterns. The user device group corresponding to the coordinated group is formed of user devices having the coordinated group in their spare coordinated groups. The base station uses channel state information reported from the user devices of the user device group corresponding to the coordinated group as a basis to perform user scheduling on the coordinated group.

Abstract: The present invention provides a user equipment and channel state information feedback method. The channel state information feedback method used in a coordinated multi-point system includes acquiring small-scale channel state information H?=[H?1, H?2, . . . , H?K] between a user equipment and all base stations joining coordination, acquiring large-scale channel state information li(i=1, . . . , K) between the user equipment and each of the base stations joining coordination, acquiring a CQI (CQIi=li?|H?|, i=1, . . .

Abstract: A mounting apparatus for a data storage device includes a bracket, a plurality of shock absorbers positioned between the data storage device and the bracket, a plurality of fasteners, and two elastic members. The bracket includes a bottom plate, and two sidewalls. Each of the plurality of shock absorbers includes a shock absorber pad, and a bushing protruding from an outer side of the shock absorber pad. The shock absorber pad defines a first through hole therein. Each of the plurality of fasteners includes a post and a head portion. The post is passed through the bushing, the first through hole of the shock absorber pad to engage one of a plurality of second mounting holes of the data storage device. Each of the two elastic members is fixed to the inner side of one of the two sidewalls of the bracket.

Abstract: Embodiments of the present invention include a method and base station for obtaining Channel Quality Indicator (CQI) information. One embodiment of the method includes: receiving, by a base station, quantized channel information, quantization error, Inter-Cell Interference (ICI) power and noise power fed back by each User Equipment (UE) after channel estimation; and estimating, by the base station, a CQI corresponding to each UE to obtain an estimated CQI value corresponding to each UE according to the quantized channel information, the quantization error, the ICI power and the noise power which are fed back by the UE as well as an instantaneous precoding vector or matrix of each UE. Through the embodiments, the base station can obtain more precise CQI information of each UE so as to select a precise modulation and coding scheme and to increase system throughput.

Abstract: Embodiments of the present invention disclose a method for coordinated multi-cell transmission, a central controller and a User Equipment (UE). In one embodiment, the method includes: determining, by a central controller, at least one candidate cooperating set in a super-cell, wherein each cell in the super-cell belongs to at least one candidate cooperating set, and broadcasting information of the at least one candidate cooperating set determined to all UEs in the super-cell; selecting, by each UE, a candidate cooperating set from the at least one candidate cooperating set as a cooperating set of the UE, and feeding back information of the cooperating set selected to the central controller; and determining, by the central controller, all cooperating sets in the super-cell and UEs participating in cooperation in each cooperating set according to the information of the selected cooperating set fed back by each UE.

Abstract: A mounting apparatus for a data storage device includes a bracket, a plurality of shock absorbers positioned between the data storage device and the bracket, a plurality of fasteners, and two elastic members. The bracket includes a bottom plate, and two sidewalls. Each of the plurality of shock absorbers includes a shock absorber pad, and a bushing protruding from an outer side of the shock absorber pad. The shock absorber pad defines a first through hole therein. Each of the plurality of fasteners includes a post and a head portion. The post is passed through the bushing, the first through hole of the shock absorber pad to engage one of a plurality of second mounting holes of the data storage device. Each of the two elastic members is fixed to the inner side of one of the two sidewalls of the bracket.

Abstract: A system is configured for monitoring power-on self-test (POST) codes generated by a motherboard under a power cycling test. The system includes a recording device configured to save the POST codes and a monitoring circuit board. The monitoring circuit board is configured to receive the POST codes from the motherboard and output the POST codes to the recording device. The monitoring circuit board is capable of displaying the POST codes one by one to indicate a current running state of the motherboard and outputting the POST codes in a format that the recording device is receivable. A method for monitoring power-on self-test (POST) codes generated by a motherboard under a power cycling test is also disclosed.