摘要:
A method of synchronizing databases of a plurality of monitoring devices in a communications system having a communications device, a first monitoring device and a second monitoring device for monitoring the communications device and a network connecting these devices. Each monitoring device accommodates a database. The first monitoring device transmits a control command with a network address of the first monitoring device to the communications device. The communications device transmits the received network address to the second monitoring device. The first monitoring device updates registered data recorded in the database accommodated by the first monitoring device. The second monitoring device transmits a read-out request for reading out registered data which is altered by the updating operation and recorded in the database accommodated by the first monitoring device, to the first monitoring device by using the network address of the first monitoring device received from the communications device. When the second monitoring device receives the registered data, the second monitoring device updates registered data recorded in the database accommodated by the second monitoring device based on the received registered data.
摘要:
The disclosed is a transmission device including a plurality of transmission antennas for transmitting signals in the same channel at the same time point to a plurality of reception devices, characterized by including: a dedicated reference signal generator configured to generate dedicated reference signals for the respective reception devices; a data signal generator configured to generate data signals for the respective reception devices; a spatial multiplexer configured to spatially multiplex at least some of the dedicated reference signals and at least some of the data signals; and a transmitter configured to transmit the spatially multiplexed signals.
摘要:
A terminal device notifies a base station device about control information associated with a receive quality of the terminal device. The base station device performs data modulation on a plurality of pieces of transmit data for the terminal device, by using a plurality of different data modulation schemes one by one, based on the control information, and spatially multiplexes the plurality of pieces of transmit data after the data modulation over a single wireless resource and transmits a spatially multiplexed signal. The terminal device receives the signal with the plurality of pieces of transmit data spatially multiplexed, and detects desirable transmit data from the receive signal, based on a first channel matrix which represents channel state information between the base station device and the terminal device and a second channel matrix in which the first channel matrix is multiplied by a transform matrix. Accordingly, an adaptive modulation technology is applied even to MIMO spatial multiplexing transmission using a LR technology, and hence a wireless communication system and so forth that can contribute to improvement in frequency utilization efficiency can be provided.
摘要:
A wireless communication system includes a base station apparatus having a plurality of antennas and a plurality of mobile station apparatuses each having, at least, one antenna. The base station apparatus acquires channel state information of the plurality of mobile station apparatuses, based on any one of a plurality of different channel state information formats, and, separately precodes data signals addressed to the plurality of mobile station apparatuses based on the channel state information, and spatially multiplexes and transmits the precoded signals. The mobile station apparatus receives the precoded signals and detects a desired data signal from the multiplexed signals addressed to mobile station apparatuses, based on the channel state information. With this scheme, it is possible to realize a new spatial multiplexing technology that enables a plurality of mobile station apparatuses using different CSI feedback schemes to be spatially multiplexed on the same wireless resource in the downlink MU-MIMO transmission.
摘要:
A wireless communication system in which a base station apparatus having a plurality of transmission antennas and one or more terminal apparatuses communicate with each other is provided with at least two methods of a first feedback method and a second feedback method regarding propagation path information at the time of reception. In accordance with a communication condition between the base station apparatus and the terminal apparatus, or the function of the terminal apparatus, the terminal apparatus performs feedback by one of the two methods of the first feedback method and the second feedback method. The base station apparatus performs spatial multiplexing transmission on the basis of the propagation path information that has been fed back. Thus, in a system in which CSI is fed back for MIMO transmission, desired transmission characteristics can be efficiently obtained.
摘要:
When spatial multiplexing is performed to any of a plurality of receiving antennas included in each terminal, it becomes possible to obtain excellent receiving characteristics by combining signals received by all antennas appropriately. A receiving antenna unit 28 receives channel state information from each terminal, a channel matrix H is obtained. A transmit weight/interference coefficient calculation unit 24 calculates a transmit weight and an interference coefficient based on channel matrix. The transmit weight is input to transmit weight multiplication units 17 and 23. The interference generation unit 15 generates an interference signal based on the interference coefficient. An interference subtraction unit 13 subtracts the interference signal from a desired signal. A modulo unit 14 adds a signal so that amplitude of an information signal output from the interference subtraction unit 13 falls within a constant range. A signal multiplexing unit 18 performs spatial multiplexing to the signal performed nonlinear arithmetic.
摘要:
To efficiently perform adaptive modulation and adaptive scheduling in a communication control apparatus, while suppressing the total notified amount of reception quality information, provided is a communication terminal apparatus 300 which is applied to a multicarrier communication scheme in which the apparatus receives a signal on a channel allocated by a communicating party among a plurality of channels each comprised of at least one subcarrier, measures reception quality of the received signal, and notifies the communicating party of reception quality information, and has a reception quality measuring section 308 that measures reception quality of each subcarrier, and a reception quality information generating section 309 which determines an allocation request degree of each channel with respect to the communicating party, selects an information amount to represent reception quality information for each channel based on the allocation request degree, and based on the measured reception quality, generates the reception quality information represented by the selected information amount.
摘要:
[Object] To prevent communication performance capabilities from deteriorating even in the cases that the estimation error of the propagation path is significant, and that the variation speed of the propagation path characteristics is fast.[Overcoming Means] An adaptive modulation control apparatus which adaptively selects a modulation parameter from among a plurality of modulation parameters corresponding to an estimation result of a propagation path state and which has a frequency axis gradient calculating section (11) which receives propagation path estimation information indicative of an estimation result of a propagation path state, and calculates a gradient of a function of frequency corresponding to each frequency when the propagation path estimation information is set to be the function of frequency, a correcting section (12) that makes a correction to increase or decrease an upper limit or a lower limit of a numerical range of the propagation path state in one-to-one correspondence with each of the modulation parameters corresponding to the calculated gradient of the function of frequency, and a modulation parameter selecting section (13) that selects a modulation parameter corresponding to the corrected numerical range of the propagation path state including the propagation path estimation information.
摘要:
To efficiently perform adaptive modulation and adaptive scheduling in a communication control apparatus, while suppressing the total notified amount of reception quality information, provided is a communication terminal apparatus 300 which is applied to a multicarrier communication scheme in which the apparatus receives a signal on a channel allocated by a communicating party among a plurality of channels each comprised of at least one subcarrier, measures reception quality of the received signal, and notifies the communicating party of reception quality information, and has a reception quality measuring section 308 that measures reception quality of each subcarrier, and a reception quality information generating section 309 which determines an allocation request degree of each channel with respect to the communicating party, selects an information amount to represent reception quality information for each channel based on the allocation request degree, and based on the measured reception quality, generates the reception quality information represented by the selected information amount.
摘要:
A wireless communication device receives signals using a channel allocated from N channels to the wireless communication device by another wireless communication device. The wireless communication device includes: a storage that stores information concerning at least newest (M−K) request channels among M request channels that are candidates to be allocated; an additional channel selector that selects K additional channels to be newly added to request channels from the N channels excluding the (M−K) request channels, selects at least newest (M−K) request channels from the request channels including the (M−K) request channels stored and the K additional channels selected, and stores information indicative of the (M−K) request channels selected in the storage; and a report information generator that generates report information that is to be reported to the other wireless communication device and includes information indicative of the K additional channels selected by the additional channel selector.