54results 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.

In a wireless communication system, a plurality of base stations each comprise a plurality of cells and a terminal communicates with the base stations. Each of the base stations is equipped with one or a plurality of antennas. The base stations transmit first reference signals that do not overlap with at least those of neighborhood base stations and are unique to the antennas. The terminal receives the first reference signals, estimates the reception powers of the first reference signals transmitted from the respective antennas, selects, based on the estimation results of the reception powers, a plurality of the antennas suitable for communication, and transmits the antenna selection results to the base stations. The base stations refer to the antenna selection results transmitted from the terminal to assign the antennas belonging to the different cells to the terminal and notify the terminal of the results of assigning the antennas.

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.

The object is to control interference in a permissible range by applying the CDMA system to signal collision in the conventional CSMA and TDMA base multihop systems and to relax the hidden terminal problem and others to enhance the throughput of the entire system by grouping of channel groups in multihop transmission and by control of transmission based on an interference level from another station. A multihop relay station calculates a desired signal level, for example, from an interference level at its own station of a packet sent from a mobile station, and notifies the mobile station of the desired signal level; and the mobile station calculates a transmission power amount of a packet from the desired signal level, determines whether the packet is transmissible to the station as a source of the desired signal level, on the basis of the transmission power amount, and transmits the packet by a power of the transmission power amount to the source station determined as a packet-transmissible station. On this occasion, an interference signal is weakened by assignment of channel groups 1, 2 for transmission of signals.

The invention discloses a meter reading module based on a Lora wireless sensor network, the meter reading module includes a PC, a plurality of ammeters and gateway nodes which are connected with the PC through serial ports, the ammeters are connected with Lora modules as routing nodes through the serial port, the ammeters supply power to the Lora modules, each Lora module includes a mcu and a radio frequency ( rf ) chip, the radio frequency ( rf ) chip and the mcu are connected, the Lora modules are networked by the radio frequency ( rf ) chips, the Lora modules and the gateway nodes are networked by the radio frequency ( rf ) chips, the Lora modules are networked mutually, a superior connection point of the Lora modules also can be Lora modules, the meter reading problem is solved, at the same time, end-to-end low-transmission time-delay communication can be guaranteed, at the same time, the meter reading module has high reliable communication ability in large-scale and high density node layout scenarios, and has the advantages of a high network coverage rate, a flexible structure, high reliability, strong versatility, simple construction and laying and convenient maintenance.

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 present invention suppresses to a minimum the degradation of the transmission quality caused by chromatic dispersion characteristic of an optical transmission medium, and the interplay between the chromatic dispersion and non-linear optical effects in dense WDM transport systems. A baseband input data signal is pre-coded in advance by a pre-coding unit, phase modulation is carried out using a pre-coded signal by the optical phase modulating unit, and the phase modulated optical signal is converted to an RZ intensity modulated signal by the optical filter unit that performs phase-shift-keying to amplitude-shift-keying conversion. For example, an optical phase modulating unit generates an encoded DPSK phase modulated signal using a differential phase shirt keying (DPSK) format, and a phase modulated signal is converted to an RZ intensity modulated signal by the optical filter unit disposed downstream of the optical phase modulating unit.

A multicarrier communication method capable of improving the frequency utilization efficiency and the throughput of the communication system, while satisfying the QoS. A communication terminal reports the CQI about all of the subchannels included in the bandwidth of a communication channel during a first CQI report, as shown in the upper figure portion. Unlike the first report, during the second and following CQI reports, in which much time is left in terms of the permissible delay time, the communication terminal reports the CQI only about subchannels 1 and 2 assigned by the second and following frequency assignments, as shown in the lower figure portion.

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.

The present invention makes up for shortages of a central control type and a distributed control type radio communications systems, not only restrains interference of radio stations using the same radio communications system, and also restrain the interference of the surrounding radio stations, thereby effectively using a frequency source. The radio communications system includes a radio station connecting with a network (a network connecting radio station) and a counterparty radio station. The network connecting radio station obtains information A of a radio communication status through the network and transmits to the counterparty radio station. The information A comprises using frequency information of the radio station and waveform characteristic quantity information indicating statistic properties of signal waveforms transmitted by the radio station. The counterparty radio station calculates a measured value of the waveform characteristic quantity of the signal received from another radio station and reports the measured value to the network connecting radio station aiming at each part of the announced waveform characteristic quantity. The network connecting radio station determines whether to communicate or not and a radio source according to the information A and the information reported by the counterparty radio station.

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.

when the SC-FDMA method is used in combination with the multi-antenna transmission technique, a radio transmission method effectively improves the frequency use efficiency by performing appropriate frequency allocation to a plurality of antennas while suppressing degradation of the reception quality caused by interference. In the radio transmission method of the SC-FDMA type, according to the number of terminals simultaneously accessing a base station within a usable frequency band, it is possible to allocate all the transmission signals (transmission stream) to be transmitted by different antennas to different frequency bands or to use the MIMO transmission in combination. Moreover, according to the number of terminals making an access, the number of terminals which perform the MIMO transmission can be varied.

The invention relates to MFSK water sound communication method and an MFSK water sound communication system. According to the method, m sequence is employed for digital signal modulation, after signal frequency spectrum broadening, the m sequence is modulated to a radio frequency signal, and the modulation radiofrequency signal is sent out; during signal demodulation, correlation operation of the m sequence and a reception signal is carried out, a peak initial position of each code element is estimated to realize code element synchronization, code element diffusion is then realized, then frequency estimation is carried out, a CZT transformation algorithm is employed for frequency estimation to realize frequency spectrum refinement for the frequency band signal after despreading, the refined frequency spectrum is acquired, channel decoding is carried out according to the refined frequency spectrum, output is carried out, the reception signal frequency spectrum is better refined, the smallest frequency interval is smaller, code element length requirements during frequency estimation are reduced, a communication rate is improved, the frequency interval is reduced, frequency utilization efficiency is improved, and code element synchronization processing is made to be more precise.

A base station apparatus and a channel allocation method are disclosed. The task of the invention is to improve the frequency using efficiency. A base station (12) includes an array antenna composed of a plurality of antenna elements (20-1 to 20-4), and uses at least one part of the plurality of antenna channels to communicate with the mobile station. The base station (12) comprises: an adaptive control unit for obtaining weights (w1' to w4') of antenna elements (20-1 to 20-4) indicating an arrival direction of an interference signal detected on a radio channel that is not being used for communication, and weights (w1 to w4) indicating an arrival direction of a desired signal arriving from a mobile station. The base station further includes an interference signal suppressibility determining unit (34) for determining, based on the weights (w1 to w4) and the weights (w1' to w4'), whether or not it is possible to form a direction pattern that directs a main beam toward the arrival direction of the desired signal and directs a null toward the arrival direction of the interference signal; and a channel allocation unit (36) for determining, based on a result of the determination, whether to allocate the mobile station the radio channel on which the interference signal is detected.

The invention provides a mobile communication system, a mobile station device, a base station device and a mobile communication method. The mobile communication system includes a mobile station device and base station devices. The mobile station device includes a reception quality measuring unit for measuring the reception qualities according to the signals transmitted from base station devices near the mobile station device, a determining unit for determining a base station device to communicate with the mobile station device according to the service which the mobile station device requests and the measured reception quality, and a communicating unit for communicating with the determined base station device.

Provided is a communication device, which constitutes a wireless communication system together with a base station and a terminal station and relays and transfers a signal transmitted and received between the base station and the terminal station. The communication device is characterized in that, when the communication device receives a signal transmitted from the base station or the terminal station, the communication device uses a frequency different from a frequency at the time of the receiving and transfers the received signal after amplifying the same.

A base station device that carries out carrier sense to ensure a wireless medium for a prescribed period, sets an uplink communication period in at least a portion of the prescribed period, selectively or simultaneously sets a first communication mode and a second communication mode in at least one uplink subframe period that is included in the uplink communication period, and transmits a downlinksubframe including common control information that indicates the communication mode that is set to the uplink subframe period, the first communication mode allowing a terminal device to communicate on the basis of the scheduling information of the base station device, and the second communication mode allowing the terminal device to communicate without requiring the scheduling information of thebase station device.

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.

The invention relates to electronic equipment, a wireless communication method and a medium. The electronic equipment comprises a circuit, which is configured to execute the following operations of: obtaining a first channel state, wherein the first channel state at least comprises the channel state of a channel from a first device to a first antenna associated with the electronic equipment; and the first device and the electronic equipment perform wireless communication; and, obtaining a second channel state based on the first channel state, wherein the second channel state comprises the channel state of a channel from a second antenna associated with the electronic equipment to the first device.

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 communication device of a new system used in a region where both of an old system and a new system of the FDD method are used includes: a means for communication of at least a downlink data channel of the new system in a band belonging to a certain band (3.4 to 3.8 GHz); and a means for communication of at least an uplink control channel of the new system in a band belonging to a band lower than the certain band (band of 2 GHz). In other band, uplink / downlink communication is performed in the old system.

Provided is a wireless communication device capable of setting a wireless LAN base station so that the overall frequency utilization efficiency of a wireless communication system including wireless LAN base stations of different models of different manufacturers can be improved. A wireless communication system that performs settings necessary for operating a wireless LAN base station constituting a wireless communication network includes an information collecting unit that collects setting information set in the wireless LAN base station and a wireless environment in the wireless LAN base station. information; a parameter calculation unit that obtains parameters that should be set for the wireless LAN base station of the collection source based on the collected setting information and wireless environment information; and a parameter setting unit that transmits the required parameters to the wireless LAN base station of the collection source via the network. Get the parameters and set the parameters.

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).

The coverage area of a transmission device is expanded by relaying, and frequency utilization efficiency (cell throughput) is improved. Disclosed is a relay device that transmits signals received from a transmission device by a reception device. The relay device is equipped with a received signal processing unit (33) that demodulates the signals received from the transmission device, a selection unit (34) that selects a transmission method that can be demodulated by the reception device from multiple transmission methods, and signal generation units (35a, 35b) that generate signals used by the transmission method selected by the selection unit (34) based on the signals demodulated by received signal processing unit (33).