53results about How to "Improve frequency utilization efficiency" patented technology

Each of first radio communication devices includes; a frequency spread unit which spreads frequency of a transmitted signal to generate a frequency-spread signal; and a mapping unit which allocates the frequency-spread signal to a subcarrier according to the mapping information which specifies a subcarrier. A second radio communication device includes: a demapping unit which extracts from a received signal a signal of the subcarrier specified by the mapping information; and an inverse frequency spread unit which inverse-frequency-spreads the extracted signal. The first radio communication device or the second radio communication device includes a use subcarrier decision unit that decides a subcarrier to which the frequency-spread-signal is allocated according to a communication path capacity of each subcarrier of each antenna used for transmission by the first radio communication devices and generates mapping information used to specify the decided subcarrier.

The invention provides a distributed data acquisition control system which comprises a remote monitoring platform and more than one wireless communication data acquiring units. The remote monitoring platform is connected with the wireless communication data acquiring units through the WiMin wireless network. The WiMin system has unique advantages in the aspects of critical performances such as network coverage, data transmission speed and power consumption and can be widely applicable to various complicated environment due to strong and flexible networking thereof. Therefore, the problems of high construction cost and construction difficulty of wired communication and the problems of short communication distance of Zigbee, WiFi and the like in the wireless communication and about signal coverage areas and posterior running cost of the GSM (global system for mobile communication)/CDMA (code division multiple access) are all solved by the WiMin data communication technology.

A base station device includes a plurality of directional antennas, a power control unit and a frequency management unit. The cell is formed with layers of a base cell having a cell border with a cell formed by a neighboring base station device and including a plurality of sector cells and a small-cell having a cell radius smaller than a cell radius of the base cell and including at least four sector cells by the plurality of directional antennas and the power control unit. The frequency management unit manages frequency bands so that different frequency bands are allocated to the sector cells of the base cell, and a frequency band, which is different from the frequency bands allocated to the base cell and different between neighboring sector cells but the same between at least two sector cells, is allocated to each of the sector cells of the small-cell.

In a method for mapping an operating frequency band of a mobile station device in a mobile communication system, an operating frequency band position at the time of idle mode of respective mobile station devices is arranged so as to be distributed throughout a unique frequency bandwidth of a base station device.

The base station (BS) 202 receives the voice signal of the FDD system transmitted from the mobile station (MS) 201 as a communication terminal, and sends the received data obtained by performing predetermined processing to the mobile switching station 204 through the wireless network control station 203 . The MSC enables data from several base stations to be aggregated and sent to the telephone line network 207. On the other hand, the high-speed packet of the TDD system transmitted from the mobile station (MS) 201 is received by the base station (BS) 205, and the received data obtained by performing predetermined processing is routed by the router 206 and sent to an IP (Internet Protocol) packet. Net 208.

The invention provides a dispatching device and the method thereof. The device comprises a first priority obtaining unit used for obtaining the first priority of all sub bands for all the users; a importance degree computing unit, through which the importance degree of all the sub bands computed the first priority for all the users is obtained according to the first priority obtaining unit; a dispatching unit, through which the computed result of the importance degree computing unit is dispatched. The device also comprises a second priority computing unit. At the time, the second priority of all the sub bands for all the users is computed through the second priority computing unit; the importance degree of all the sub bands for all the users is computed through the importance degree computing unit according to the first priority and the second priority. By using the dispatching device and method, wireless resource can be appropriately distributed according to the change of the channel in the time domain and the frequency domain relative to all the users, and thereby the utilization efficiency of the frequency spectrum is enhanced.

Embodiments of the present invention disclose a time synchronization method between direct-through UEs, and UEs. The method comprises: when a direct-through link is established between a first UE and a second UE, receiving a configuration parameter sent by a base station, the configuration parameter comprising a second time frequency resource location of the second UE sending a detection signal; acquiring, according to a first downlink timing between base stations, a second detection signal sent by a second UE; detecting the second detection signal according to signal relativity, and acquiring a first time deviation; and performing time synchronization with the second UE according to the first time deviation. The embodiments of the present invention can adjust, by means of detection signals between direct-through UEs, data sending timing of an originating UE between the direct-through UEs, so as to make the data sending timing of the originating UE be consistent with that of a receiving UE, thereby making the direct-through UEs synchronously and transmit data at regular time according to the adjusted time. The accuracy of data transmission between direct-through UEs is ensured, and the frequency utilization efficiency of the system is improved.

Provided is a wireless communication device whereby settings for wireless LAN base stations can be made in such a way as to improve the efficiency of frequency utilization throughout the entirety of a wireless communication system that includes different models of wireless LAN base stations from different makers. The wireless communication system makes settings necessary for operation of wireless LAN base stations constituting a wireless communication network, and is provided with: an information collection unit for collecting settings information relating to settings of the wireless LAN base stations and wireless environment information at the wireless LAN base stations; a parameter computation unit for calculating, on the basis of the collected settings information and wireless environment information, parameters to be set for the wireless LAN base stations for which the information was collected; and a parameter setting unit for transmitting the calculated parameters over the network to the wireless LAN base stations for which the information was collected, and making parameter settings.

A communication terminal in soft handover selects a base station device transmitting a downlink signal for each selection/synthesis unit at the base station device based on the quality judgment results of downlink from a plurality of base station devices, and the selected base station device transmits a downlink message. When the difference between the receiving power of a downlink signal from the selected base station device and the maximum receiving power of the downlink signals from other base station device exceeds a predetermined value, the base station device transmitting the downlink signal with maximum receiving power is selected.

The present invention provides a first and second quadrature modulators (109,110) quadrature modulate Nyquist signals, which have been given delay differences of two and four times the symbol period, respectively, using, as a carrier, a cosine wave having a frequency that is an odd multiple of the basic frequency of Nyquist signal. A third quadrature modulator (113) quadrature modulates the modulated signals obtained by the first and second quadrature modulators (109,110), using a carrier having a predetermined frequency. In this way, a modulated signal can be obtained in which four Nyquist signals are arranged within a single symbol period (T) with no mutual interference.

This invention provides a light transfer apparatus and a light transfer method wherein a pair of phase conjugation signals can be transferred without degradation of frequency utilization efficiency and combined on a reception side with the transfer quality degradation being suppressed. The light transfer apparatus connects the light transmission unit (100) and the light reception unit (300) through the light transfer unit (200). The light transmission unit (100) comprises: a signal arrangement unit (102) that generates, on the basis of externally input plural-system signals, a pair of plural-system phase conjugation signals and mixture-dispersion-arranges the pair of phase conjugation signals in an orthogonal polarization electric-field; and a light modulation unit (104) that converts the electric signals supplied from the signal arrangement unit (102) into a light signal and outputs the light signal to the light transfer unit (200). The light reception unit (300) comprises: a photoelectric conversion unit (301) that converts the light signal transferred by the light transfer unit (200) into the electric signals; and a signal reconstruction unit (303) that combines the mixture-dispersion-arranged signals supplied from the photoelectric conversion unit (301), thereby reconstructing the original plural-system signals.

A wireless communication system comprises a base station (4) and terminals (1) - (3). The base station (4) and the terminals (1) - (3) perform a space division multiplex wireless transmission. Each of the base station (4) and the terminals (1) - (3) comprises a multi-beam antenna for a space division multiplex. A beam pattern formed by the multi-beam antenna of the base station (4) is orthogonalized based on transfer function values of a radio-wave-propagation characteristic formed between antenna elements of the multi-beam antenna of the base station (4) and antenna elements of multi-beam antenna of the terminals (1) - (3).

A transmitter apparatus, which divides transport data into spatial streams and then transmits them in parallel with one another in MIMO communication system, comprises a control part (8) that selects modulation schemes for the respective spatial streams and decides, based on the modulation schemes, a data distributing method for each of the spatial streams; a distributing part (3) that distributes, based on the data distributing method decided by the control part (8), the transport data for each of the spatial streams; and modulating parts (4-1 to 4-N) that use the modulation schemes, which were selected by the control means for the respective spatial streams, to modulate the distributed data of the spatial streams outputted by the distributing part (3).