Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L1/00—Arrangements for detecting or preventing errors in the information received
  • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L5/00—Arrangements affording multiple use of the transmission path
  • H04L5/003—Arrangements for allocating sub-channels of the transmission path
  • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload

Definitions

• Transmission method transmission system, transmission device, and reception device
• the present invention relates to a transmission method, a transmission system, a transmission device, and a reception device that transmit and receive a modulated digital signal between the transmission device and the reception device.
• a plurality of wireless communication systems such as mobile phones, wide area wireless LANs such as wireless LAN (Local Area Network) and WiMAX (Worldwide Interoperability for Microwave Access) have been put into practical use.
• wireless communication systems increase, there is a problem that available frequency resources are limited.
• the band below 6 GHz is used extensively nationwide for terrestrial digital broadcasting and mobile phones, and the problem is significant.
• cognitive radio has been conducted.
• Cognitive radio is a new technical proposal that aims to advance the radio communication system while coordinating between multiple radio systems.
• a radio device such as a terminal or base station has a function to recognize or recognize the surrounding radio wave environment.
• the radio device will select the frequency and method to be used for wireless communication to increase the efficiency of wave number utilization.
• users can enjoy high-speed data communication and stable communication services.
• SC-FDMA Single Carrier Transmission Frequency Division Multiple Access
• DFT Discrete Fourier Transform
• Patent Document 1 US Patent Application Publication No. 2005Z0207385
• Non-Patent Document 1 Third Generation Partnership Project, Technical SPECIFICATION GROUP Radio Access Network, Physical Layers PETERS FOR EVOLVED UTRA (Release 7), V1.5.0 2 00 — 5 p67— 69 (3rd feneration Partnersnip Project, Technical Specification uroup Radio Access Network; Physical Layer Aspects for Evolved UTRA (Release 7), VI.5.0 2006-5 p67-69)
• An object of the present invention is to set a use band with less interference in a pre-assigned main band, transmit a spectrum to be transmitted in a distributed manner in each use band, and recombine these in a receiving apparatus.
• An object of the present invention is to provide a transmission method, a transmission system, a transmission device, and a reception device capable of realizing high-speed communication by efficiently using a free area.
• Another object of the present invention is to set an auxiliary band that is different from a pre-assigned main band, and further set a use band with less interference within these bands, and set a spectrum to be transmitted for each band.
• Transmission method, transmission system, transmission device, and reception device capable of realizing high-speed communication by efficiently using the free space by distributing and transmitting in the use band and recombining them in the reception device Is to provide.
• a transmission method is a transmission method in which a modulated digital signal is transmitted and received between a transmission device and a reception device, and the digital signal modulated by the transmission device is converted to a frequency band spectrum.
• a band information transmitting step for transmitting information on the set used band from the receiving device to the transmitting device, and a spectrum converted by the converting step to each used band transmitted by the band information transmitting step.
• a transmission method relates to a reception step of receiving a digital signal related to a spectrum in the main band transmitted to the reception device by the transmission step, and a spectrum received by the reception step.
• a transmission method is a transmission method for transmitting and receiving a modulated digital signal between a transmission device and a reception device, and converts the digital signal modulated by the transmission device into a spectrum in a frequency band.
• a converting step for converting, a band setting step for setting an auxiliary band different from a main band previously allocated between the transmitting device and the receiving device, and a plurality of used bands to be used in the main band and the auxiliary band A used bandwidth setting step in which the receiving device sets the bandwidth, a bandwidth information transmission step in which information related to the used bandwidth set in the used bandwidth setting step is transmitted from the receiving device to the transmitting device, and a conversion step.
• the transmission method includes a reception step of receiving a digital signal related to a spectrum in the main band and the auxiliary band transmitted to the reception device in the transmission step, and a spectrum received in the reception step.
• An extraction step for extracting a spectrum within the use band set by the use band setting step from the digital signal according to the receiver, and a spectrum extracted by the extraction step is combined by the reception device And a combining step.
• a transmission system is a transmission system that transmits and receives a modulated digital signal between a transmission device and a reception device, and converts the digital signal modulated by the transmission device into a spectrum in a frequency band.
• Conversion unit a use band setting unit that sets a plurality of use bands to be used in a main band allocated in advance between the transmission device and the reception device, and a setting by the use band setting unit
• a band information transmitting unit that transmits information on the used band from the receiving device to the transmitting device, and a band converted by the converting unit to each used band transmitted by the band information transmitting unit.
• An arrangement unit provided in the transmission device to be distributed and a digital signal related to a spectrum in the main band including a spectrum distributed by the arrangement unit.
• a transmission system includes a receiving unit that receives a digital signal related to a spectrum in the main band transmitted by the transmitting unit to the receiving device, and a digital signal related to the spectrum received by the receiving unit.
• An extraction unit provided in the receiving device for extracting a spectrum within the use band set by the use band setting unit from the signal, and a combining unit provided in the receiving device for combining the spectra extracted by the extraction unit It is characterized by this.
• a transmission system is a transmission system that transmits and receives a modulated digital signal between a transmission device and a reception device, and converts the digital signal modulated by the transmission device into a spectrum in a frequency band.
• Converter a band setting unit for setting an auxiliary band different from the main band allocated in advance between the transmitting device and the receiving device, and a plurality of used bands to be used in the main band and the auxiliary band Is set by the receiver
• a used band setting unit a band information transmitting unit that transmits information about the used band set by the used band setting unit from the receiving device to the transmitting device, and a spectrum converted by the converting unit, the band information transmitting Receiving the digital signal relating to the spectrum in the main band and the auxiliary band including the arrangement unit provided in the transmission device distributed and arranged in each use band transmitted by the unit, and the spatter distributed and arranged by the arrangement unit And a transmission unit for transmitting to the apparatus.
• a transmission system includes: a receiving unit that receives a digital signal related to a spectrum in the main band and an auxiliary band transmitted to the receiving device by the transmitting unit; and a spectrum received by the receiving unit.
• An extraction unit provided in the receiving device for extracting a spectrum within the use band set by the use band setting unit from the digital signal, and the receiving device for combining the spectrum extracted by the extraction unit. And a connecting portion to be provided.
• the transmission system includes an arrangement information setting unit that sets arrangement information of each spectrum with respect to the used band, and the arrangement unit converts the spectrum converted by the conversion unit into the arrangement information.
• the band information transmission unit is configured to be distributed and arranged in each use band transmitted by the band information transmission unit.
• the transmission system according to the present invention is characterized in that the combining unit is configured to combine the spectra extracted by the extracting unit based on the arrangement information set by the arrangement information setting unit. .
• the transmission system according to the present invention is characterized in that the arrangement information setting unit is configured to set arrangement information for rearranging each spectrum for the used band according to a predetermined rule.
• a transmission device includes a conversion unit that converts a modulated digital signal into a spectrum of a frequency band in a transmission device that transmits the modulated digital signal to the outside, and a pre-assigned main signal.
• the used band information receiving unit that receives information on a plurality of used bands that should be used within the band from the outside, and each use received by the used band information receiving unit that is converted by the converting unit.
• a transmission apparatus includes a conversion unit that converts a modulated digital signal into a spectrum of a frequency band, and a pre-assigned main signal in the transmission apparatus that transmits the modulated digital signal to the outside.
• a band setting unit that sets an auxiliary band different from the band, a used band information receiving unit that receives information on the main band and a plurality of used bands to be used in the auxiliary band from the outside, and conversion by the converting unit
• the distributed spectrum is distributed to each used band received by the used band information receiving section, and the main band and the auxiliary band including the spectrum distributed by the arranging section are related to the spectrum.
• a transmitter that transmits the digital signal to the outside.
• the transmitting apparatus includes an arrangement information setting unit that sets arrangement information of each spectrum with respect to the use band, and the arrangement unit includes the spectrum converted by the conversion unit as the arrangement information. Based on the arrangement information set by the information setting unit, the use band information is configured to be distributed to each use band received by the reception unit.
• the transmission apparatus is characterized in that the arrangement information setting unit is configured to set arrangement information for rearranging each vector for the used band according to a predetermined rule.
• a receiving apparatus is a receiving apparatus that receives a modulated digital signal from the outside.
• a use band setting unit that sets a plurality of use bands to be used within a pre-assigned main band;
• a band information transmitting unit that transmits information on the used band set by the used band setting unit to the outside, a receiving unit that receives a digital signal related to the spectrum in the main band transmitted from the outside, and the receiving unit
• An extraction unit that extracts a spectrum within a use band set by the use band setting unit from a digital signal related to the received spectrum, and a coupling unit that combines the spectra extracted by the extraction unit.
• the use band setting unit sets a plurality of use bands to be used as a band in which a value relating to communication quality in the main band satisfies a predetermined criterion. It is configured.
• a receiving apparatus is a receiving apparatus that receives a modulated digital signal from the outside, a band setting unit that sets an auxiliary band different from a pre-assigned main band, the main band, and the auxiliary band
• a use band setting unit for setting a plurality of use bands to be used in the band
• a band information transmission unit for transmitting information on the use band set by the use band setting unit to the outside, and the main information transmitted from the outside.
• a receiving unit that receives a digital signal related to a vector within a band and an auxiliary band, and a spectrum within the used band set by the used band setting unit from the digital signal related to the spectrum received by the receiving unit.
• an combining unit that combines the spectra extracted by the extracting unit.
• the use band setting unit sets the bands that satisfy a predetermined standard for values relating to communication quality in the main band and the auxiliary band as a plurality of use bands to be used. It is configured.
• the receiving device is characterized in that the band setting unit is configured to set an auxiliary band different from a pre-assigned main band in accordance with a surrounding radio wave environment.
• the digital signal modulated by the transmission device is converted into a frequency band spacer by the converter.
• a main band is allocated in advance between the transmitting device and the receiving device.
• the used band setting unit sets a plurality of used bands to be further used from the main band at the receiving device.
• the use band is set as a plurality of use bands that should use a band in which a value related to communication quality in the main band satisfies a predetermined standard.
• the bandwidth information transmission unit of the reception device transmits information regarding the set used bandwidth to the transmission device.
• the arrangement unit of the transmission device distributes and arranges the spectrum converted by the conversion unit in each use band transmitted by the band information transmission unit. Then, a digital signal related to the spectrum in the main band including the spectrum dispersedly arranged by the arranging unit is transmitted to the receiving device by the transmitting unit.
• the receiving unit of the receiving apparatus receives the transmitted digital signal related to the spectrum in the main band, and extracts the spectrum in the use band set by the use band setting unit by the extraction unit. Finally, the spectrum extracted by the extraction unit is combined by the combining unit, so It is possible to flexibly utilize the wave number band and to increase the transmission speed.
• the digital signal modulated by the transmission device is converted into a frequency band spacer by the converter.
• a main band is allocated in advance between the transmitting apparatus and the receiving apparatus, and an auxiliary band different from the main band is set by the band setting unit.
• the setting by the band setting unit is set according to the surrounding radio wave environment, for example.
• the used band setting unit sets a plurality of used bands to be further used in the receiving apparatus from the main band and the auxiliary band.
• This use band is set as a plurality of use bands to be used, for example, bands in which values relating to communication quality in the main band and the auxiliary band satisfy a predetermined standard.
• the bandwidth information transmission unit of the reception device transmits information regarding the set used bandwidth to the transmission device.
• the arrangement unit of the transmission device disperses and arranges the spectrum converted by the conversion unit in each use band transmitted by the band information transmission unit. Then, a digital signal related to the spectrum in the main band and the auxiliary band including the spectrum distributed by the arrangement unit is transmitted to the reception device by the transmission unit.
• the reception unit of the reception apparatus receives the transmitted digital signal related to the spectrum in the main band and the auxiliary band, and extracts the spectrum in the use band set by the use band setting unit by the extraction unit. Finally, since the spectrum extracted by the extracting unit is combined by the combining unit, it is possible to efficiently use the frequency band according to the radio wave condition and to increase the transmission speed.
• the arrangement information setting unit sets the arrangement information of each spectrum with respect to the used band. For example, it is only necessary to set arrangement information for rearranging each spectrum for the used band according to a predetermined rule. Then, the arrangement unit distributes and arranges the spectrum converted by the conversion unit in each use band based on the arrangement information set by the arrangement information setting unit. Similarly, the combining unit of the receiving apparatus combines the extracted spectra based on the arrangement information set by the arrangement information setting unit. In this way, since the arrangement of each spectrum is changed using the arrangement information V, the third party cannot easily combine the received spectrum, and the security level can be further improved.
• the digital signal modulated by the transmission device is converted into the frequency band spares by the converter, and converted into the use band set in the main band. Outside Distributed. Then, the digital signal related to the spectrum in the main band including the spectrum distributed and arranged by the arranging unit is transmitted to the receiving device by the transmitting unit. The receiving unit of the receiving apparatus receives the transmitted digital signal related to the spectrum in the main band, and extracts the spectrum in the use band set by the use band setting unit by the extraction unit. Finally, since the spectrum extracted by the extraction unit is combined by the combining unit, the frequency band can be flexibly used and the transmission speed can be increased.
• the digital signal modulated by the transmission device is converted by the conversion unit into a frequency band spare, and converted into the use band set in the main band and the auxiliary band.
• the distributed spectrum is distributed.
• a digital signal related to the spectrum in the main band and the auxiliary band including the spectrum distributed and arranged by the arranging unit is transmitted to the receiving device by the transmitting unit.
• the receiving unit of the receiving apparatus receives the transmitted digital signal related to the spectrum in the main band and the auxiliary band, and extracts the vector in the used band set by the used band setting unit by the extracting unit.
• the spectrum extracted by the extraction unit is combined by the combining unit, it is possible to efficiently use the frequency band according to the radio wave condition and to increase the transmission speed.
• the waveform cannot be restored using only the main band or the auxiliary band, so that the security level in the physical layer can be improved.
• the arrangement information setting unit sets the arrangement information of each spectrum for the used band. Then, the arrangement unit distributes and arranges the spectrum converted by the conversion unit in each use band based on the arrangement information set by the arrangement information setting unit. Similarly, the combining unit of the receiving apparatus combines the extracted spectra based on the arrangement information set by the arrangement information setting unit. In this way, since the arrangement of each spectrum is changed using the arrangement information, a third party cannot easily combine the received spectrum, and the security level can be further improved. As described above, the present invention has excellent effects such as the construction of a wireless communication system with high transmission efficiency.
• FIG. 1 is an explanatory diagram showing an outline of a transmission system.
• FIG. 2 is a block diagram showing a hardware configuration of a transmission apparatus.
• FIG. 3 is a block diagram showing a hardware configuration of a receiving device.
• FIG. 5 is a flowchart showing a procedure of spectrum dispersion arrangement processing in an arrangement unit. 6] It is a block diagram showing a hardware configuration of a band setting unit in the receiving apparatus.
• FIG. 8 is a block diagram showing a hardware configuration of a used band setting unit.
• FIG. 9 is a flowchart showing a procedure for setting a used band.
• FIG. 10 is a block diagram showing a hardware configuration of a transmission apparatus according to Embodiment 2.
• FIG. 11 is a block diagram showing a hardware configuration of a receiving apparatus according to Embodiment 2.
• FIG. 12 is an explanatory diagram showing a spectrum arrangement state based on arrangement information.
• FIG. 13 is a block diagram showing a hardware configuration of a transmission apparatus according to Embodiment 3.
• FIG. 14 is a block diagram showing a hardware configuration of a receiving apparatus according to Embodiment 3.
• FIG. 15 is an explanatory diagram showing the concept of spectrum dispersion arrangement, extraction, and combination processing according to the third embodiment.
• Antenna (transmitter, receiver, bandwidth information transmitter)
• Antenna (transmitter, receiver, used bandwidth information receiver)
• FIG. 1 is an explanatory diagram showing the outline of the transmission system.
• S is a transmission system, and includes a mobile phone 10 that is one communication device provided with a transmission device and a reception device, and a base station 20 that is another communication device.
• a user of the mobile phone 10 can make a call with another user's mobile phone 10 by transmitting / receiving information to / from the base station 20.
• a mode (uplink) in which a digital signal is transmitted from the transmitting device of the mobile phone 10 to the receiving device of the base station 20 will be described, but the receiving device of the mobile phone 10 is transmitted from the transmitting device of the base station 20.
• the present invention can be similarly applied to a mode (downlink) transmitted to a mobile station. Also, in the present embodiment, a mode in which the transmission system S is applied to communication with the mobile phone 10 and the base station 20 will be described. However, the present invention is not limited to this, and is applied to communication between a wireless LAN adapter of a computer and a wireless LAN router, communication between a wireless LAN adapter in home appliances and a wireless LAN router in a home server, etc. Also good.
• FIG. 2 is a block diagram illustrating a hardware configuration of the transmission device 1
• FIG. 3 is a block diagram illustrating a hardware configuration of the reception device 2.
• the transmitter 1 includes an input unit l li, a serial Z parallel conversion unit 12, a modulator 13, a DFT unit 14, an arrangement unit 15, a band setting unit 16, a used band setting unit 17, a pilot signal generation unit 11, and a spectrum mapping unit. 181, 182, 183, IDFT (Inverse Discrete Fourier Transform) unit 191, 192, 193, CP (Cyclic Prefix) addition unit 101, 102, 103, multiplexing unit 114, orthogonal modulation unit 110, frequency conversion unit 112, and antenna It includes 113 grades.
• IDFT Inverse Discrete Fourier Transform
• CP Cyclic Prefix
• the digital signal input to the input unit l li is input to the serial Z parallel conversion unit 12.
• the modulation method is QPSK (Quadrature Phase Shift Keying)
• the digital signal input to the serial Z parallel converter 12 is serial Z parallel (serial Z parallel) converted and divided every 2 bits.
• the modulator 13 for example, QPSK or 16QAM (Quadrature Amplitude Modulation) is used.
• the modulated digital signal is input to the DFT unit 14 which is a conversion unit, time-frequency conversion is performed, and the spectrum of the frequency band is output to the placement unit 15.
• Band setting unit 16 sets an auxiliary band different from the main band allocated in advance between transmitting apparatus 1 and receiving apparatus 2.
• the auxiliary band A lower than the main band and the auxiliary band B higher than the main band are set by the band setting unit 24 of the receiver 2.
• the band setting unit 16 receives information on the main band, the auxiliary band A, and the auxiliary band B transmitted from the band setting unit 24 of the receiving device 2 of the base station 20 via the antenna 113.
• the information on the main band, auxiliary band A, and auxiliary band B may be transmitted by multiplexing with other digital signals transmitted from the transmitting device 1 of the base station 20 to the receiving device 2 (down) of the mobile phone 10. ! ⁇ .
• main band and A signal related to the information of the auxiliary band is framed, and a part of the frame is specified for control signal transmission, and is multiplexed with a digital signal that is general data and transmitted.
• the band setting unit 16 stores the received main band, auxiliary band A, and auxiliary band B information in an internal memory (not shown), and sends the main band, auxiliary band A, and auxiliary band B to the arrangement unit 15 to set the band. Information is output.
• the band setting unit 16 is connected to the main band and the auxiliary band set by the band setting unit 24 of the receiving device 2 or a management computer (not shown) through the antenna 113 via a communication network such as i mode (registered trademark) and the Internet. Information on A and auxiliary band B may be received.
• a specific band setting for the auxiliary bands A and B is set by a time band or the like, and a band with less interference is set, and information on a band to be used is transmitted from the transmission device 1 of the base station 20.
• the used band setting unit 17 further sets a band to be used for transmission / reception among the main band, the auxiliary band A, and the auxiliary band B.
• the use band is selected from the assigned band, for example, 110 MHz to 120 MHz, 125 MHz to 140 MHz, and the like.
• the bandwidth setting unit 25 of the receiving device 2 monitors the communication quality in each band, and dynamically changes the portion where the communication quality can be secured as the bandwidth to be used. Send.
• the used band setting unit 17 of the transmitting apparatus 1 receives information on the used band set by the used band setting unit 25 of the receiving apparatus 2 via the antenna 113 which is a used band information receiving unit.
• the use band setting unit 17 stores the contents in an internal memory (not shown) and outputs information on the use band to the placement unit 15 in order to set the use band.
• Information on the bandwidth to be used can be multiplexed with other digital signals transmitted from the transmitting device 1 of the base station 20 to the receiving device 2 (downlink) of the mobile phone 10 and transmitted. For example, a signal related to information on the band to be used is framed, and a part of the frame is specified for control signal transmission, and is multiplexed with a digital signal that is general data and transmitted. Details of the use band setting unit 25 of the receiving device 2 will be described later.
• Arrangement unit 15 distributes and arranges the spectrum in each of the use bands of main band, auxiliary band A, and auxiliary band B.
• Fig. 4 is an explanatory diagram showing the concept of spectrum distribution, extraction, and combination processing.
• Fig. 4 (a) shows the spectrum that the DFT unit 14 force is also input to the arrangement unit 15.
• the horizontal axis indicates the frequency. In this example, it is assumed that the number of spectra per processing unit is 64.
• the arranging unit 15 divides the spectrum into the auxiliary band A, the main band, and the auxiliary band B based on the information output from the band setting unit 16.
• Fig. 4 (b) shows the state of the divided spectrum in which the continuous spectrum is distributed and arranged in the auxiliary band A, the main band, and the auxiliary band B.
• auxiliary band A 10 spectrums are divided into auxiliary band A, 22 spectral forces are divided into main band, and 32 spectra are divided into auxiliary band B.
• Figure 4 (c) shows the auxiliary band A, main band, and auxiliary band B, which are bands that can be used between the transmitter 1 and the receiver 2, respectively.
• the bands surrounded by hatching are other transmission systems. Do not use for, because it is used in.
• the placement unit 15 further distributes and arranges the spectrum in a plurality of use bands to be used in the auxiliary band A, the main band, and the auxiliary band B based on the information from the use band setting unit 17.
• Fig. 4 (d) is an explanatory diagram showing the used bands in the auxiliary band A, the main band, and the auxiliary band B. The white portions that are not hatched indicate the used bands. The outer shell is distributed. These transmission bands and the part surrounded by hatching in Fig. 4 (d) are used in this transmission system S. For example, four spectrums are arranged in the use band al in the auxiliary band A, and six spectra are arranged in the use band a2.
• 16 spectrum powers are used in use band 1 in the main band and 6 spectra are arranged in use band 2 respectively.
• 32 spectrums are arranged in the use band b in the auxiliary band B.
• 64 spare bands are distributed in the use bands in the auxiliary band A, the main band, and the auxiliary band B.
• the spectrums in the auxiliary band A, main band, and auxiliary band B including these 64 spectra are then converted to a frequency for one hour and transmitted to the receiver 2 as a digital signal related to the spectrum.
• two auxiliary bands A and B are used, but the number is not limited to this.
• the extraction unit 26 of the receiving device 2 based on the information on the used band output from the used band setting unit 25, the used band al, the used band a2, the used band 1, the used band 2 and the used band b are respectively determined.
• the arranged spectra are extracted, and the 64 spectra are recombined at the combining unit 27 as shown in FIG. 4 (e).
• FIG. 5 is a flowchart showing the procedure of the spectrum dispersion arrangement process in the arrangement unit 15. is there.
• the placement unit 15 acquires information on the auxiliary band output from the band setting unit 16 (step S51).
• the main band information stored in the memory (not shown) is also acquired. Note that the bandwidth of the main band can be changed as appropriate by rewriting the contents of the memory according to an instruction from the bandwidth setting unit 16.
• the placement unit 15 acquires the information on the used band in each auxiliary band from the used band setting unit 17 (step S52).
• the placement unit 15 calculates the total bandwidth value of the used bandwidth set in the main bandwidth and each auxiliary bandwidth based on the acquired used bandwidth information (step S53). In the above example, this is the total value of used bandwidth al width, used bandwidth a2 width, used bandwidth 1 width, used bandwidth 2 width and used bandwidth b width. Here, s is the total bandwidth value.
• the placement unit 15 calculates the occupation ratio of the total bandwidth value s of each used bandwidth (step S54). For example, the occupation rate of the used band al is a value obtained by dividing the used band al width by the total band value s.
• the placement unit 15 calculates the occupancy rate for all the used bands. Then, the placement unit 15 multiplies the total number of spectra by the occupation ratio to calculate the number of spectra distributed in each use band (step S55). For example, if the occupancy ratio for the total bandwidth value s of the used bandwidth b is calculated as 50%, the total number of extras is 64, so the number of spectrums distributed over the used bandwidth b of the auxiliary bandwidth B becomes 32.
• the placement unit 15 performs the calculation process of step S55 for each used band, and places the calculated number of spectra in each used band in order of frequency (step S56).
• the spectrum of the main band distributed and arranged in the arrangement unit 15 is output to the spectrum mapping unit 181.
• the spectrum of the auxiliary band A is output to the spectrum mapping unit 182.
• the spectrum of the auxiliary band B is output to the spectrum mapping unit 183.
• the spectrum mapping units 181 to 183 perform mapping of the spectrum that is distributed in the use band and other spectrum outside the use band.
• the mapped main band vector, auxiliary band A spectrum, and auxiliary band B spectrum are output to IDFT sections 191 to 193, respectively.
• IDFT sections 191 to 193 convert the spectrum of main band, auxiliary band A and auxiliary band B for one hour in frequency, and output digital signals related to the time-converted spectrum to CP adding sections 101 to 103, respectively.
• CP adder 101 to 103 prevents interference between symbols Copy a part of the digital signal, paste the copied digital signal to the guard interval (the beginning of the digital signal), and expand the digital signal.
• the digital signal expanded by the CP adding units 101 to 103 is output to the multiplexing unit 114.
• the pilot signal generator 11 outputs pilot signals such as a distributed pilot signal and a continuous pilot signal to the multiplexer 114.
• This pilot signal is inserted as appropriate in multiplexing section 114 and used for channel characteristic estimation in channel characteristic estimation section 231 of receiving apparatus 2 or the like.
• the digital signal in which the pilot signal is multiplexed by multiplexing section 114 is output to orthogonal modulation section 110.
• Quadrature modulation section 110 performs quadrature modulation on the output digital signal and converts it to an intermediate frequency band.
• the quadrature-modulated digital signal is output to the frequency converter 112.
• the frequency conversion unit 112 converts the frequency band of the orthogonally modulated digital signal from the intermediate frequency band to the radio frequency band, and supplies the converted signal to the antenna 113 serving as a transmission / reception unit.
• the digital signal related to the spectrum arranged in a distributed manner is transmitted to the receiving device 2.
• Receiver 2 includes antenna 21, quadrature demodulation unit 22, RF band separation unit 221, demultiplexing unit 222, main circuit 23, auxiliary circuit 23A, auxiliary circuit 23B, extraction unit 26, band setting unit 24, and use band setting unit 25. , Including a coupling unit 27, a demodulation unit 28, and the like.
• the digital signal received by the antenna 21 which is a transmission / reception unit is demodulated into an IF band baseband digital signal by the orthogonal demodulation unit 22.
• the band setting unit 24 outputs information on bands used for transmission / reception, that is, information on the main band, auxiliary band A, and auxiliary band B, to the RF band separation unit 221.
• the RF band demultiplexing unit 221 demultiplexes the digital information for each band according to the output from the band setting unit 24!
• the demultiplexing unit 222 demultiplexes the pilot signal from the data signal.
• the separated main band digital signal is output to the main circuit 23, the auxiliary band A digital signal is output to the auxiliary circuit 23A, and the digital signal of the auxiliary band B is output to the auxiliary circuit 23B.
• the main circuit 23, the auxiliary circuit 23A, and the auxiliary circuit 23B have the same configuration, and include a channel characteristic estimation unit 231, a subchannel quality information generation unit 232, a CP removal unit 234, and a DFT unit 235.
• the pilot signal is output to the channel characteristic estimation unit 231
• the other data signals are output to the CP removal unit 234.
• the characteristic estimation unit 231 estimates the characteristic of the data signal based on the pilot signal.
• the subchannel quality information generation unit 232 generates a value related to the communication quality within the band and outputs the value to the extraction unit 26.
• the auxiliary circuit 23 A and the auxiliary circuit 23 B are provided in addition to the main circuit 23.
• the present invention is not limited to this, and a plurality of auxiliary circuits 23 A and 23 A are prepared according to the number of auxiliary bands to be used. As many auxiliary circuits as there are auxiliary bands may be used.
• the data signal in the digital signal is output to the DFT unit 235 after the guard interval portion is removed by the CP removal unit 234.
• the DFT unit 235 performs time-frequency conversion, and the spectrum after frequency conversion is output to the extraction unit 26.
• the main circuit 23 outputs the spectrum of the main band including the used band to the extracting unit 26, and the auxiliary circuit 23A power is also output the spectrum of the auxiliary band A including the used band to the extracting unit 26.
• the spectrum of the auxiliary band B including the used band is output to the extraction unit 26, respectively.
• the band setting unit 24 outputs information on the main band, the auxiliary band A, and the auxiliary band B to the extraction unit 26, and the use band setting unit 25 also outputs information on the use band to the extraction unit 26.
• the extraction unit 26 extracts the spectrum existing in the used band in the main band, the vector existing in the used band of the auxiliary band A, and the spectrum existing in the used band of the auxiliary band B, and outputs them to the combining unit 27.
• the combiner 27 combines the spectra output from the extractor 26. In other words, the spectrum is combined in a predetermined band so that the spectrum is consistent with the demodulator 28 in the subsequent stage in the order of the spectrum present in the lower band to the spectrum present in the higher band. .
• the spectrum existing in each band in the order of the use band al, the use band a2, the use band 1, the use band 2, and the use band b is combined with the transmission band suitable for the demodulator 28.
• the combined spectrum is output to the demodulator 28.
• the demodulator 28 performs demodulation according to the modulation method used at the time of modulation, and obtains a digital signal related to the combined spectrum.
• FIG. 6 is a block diagram showing a hardware configuration of the band setting unit 24 in the receiving device 2.
• the band set for the cognitive radio may be set according to the environment of the surrounding radio waves of the receiving device 2.
• the environment of the surrounding radio wave of the receiving device 2 changes with time or position, for example.
• the bandwidth setting unit 24 includes a CPU (Central Processing Unit) 241 and a RAM (Random Access Memory) 242, a clock unit 243, a storage unit 245, a position information acquisition unit 248, and the like.
• the CPU 241 is connected to the hardware units of the bandwidth setting unit 24 via the bus 247, controls them, and executes each software process according to a control program stored in the storage unit 245.
• the RAM 242 and the storage unit 245 are semiconductor memories that can be read and written by designating arbitrary addresses.
• the clock unit 243 outputs the current time to the CPU 241.
• the storage unit 245 stores an auxiliary band table 246.
• FIG. 7 is an explanatory diagram showing a record layout of the auxiliary band table 246.
• the auxiliary bandwidth table 246 includes a time zone field and an auxiliary bandwidth field. A time zone, for example, 13:00 to 15:00 is stored in the time zone field.
• the auxiliary band field stores the auxiliary band to be used in addition to the main band corresponding to the time zone.
• the auxiliary band & 13 ⁇ 4 to 1) Hz and the auxiliary band cHz to dHz are used in addition to the main band.
• the main band is stored in the storage unit 245.
• the stored contents of the auxiliary band table 246 and the stored contents of the main band are not shown by the operator depending on the situation! Alternatively, the stored contents of the auxiliary bandwidth table may be received and rewritten according to an instruction from the CPU 241.
• the auxiliary band is set according to the time zone.
• the main band and the auxiliary band may be appropriately changed according to the date. For example, try to expand the auxiliary bandwidth used on weekends.
• the CPU 241 monitors the current time output from the clock unit 243, searches the auxiliary band table 246 based on the current time, and reads out the auxiliary band in the time zone corresponding to the current time. Further, the CPU 241 reads the main band stored in the storage unit 245. The CPU 241 outputs the read main band and auxiliary band information to the extraction unit 26 and the RF band separation unit 221. Further, the band setting unit 24 of the receiving device 2 transmits the read main band and auxiliary band information to the band setting unit 16 of the transmitting device 1 via the antenna 21. In the present embodiment, the bandwidth setting unit 24 of the transmission device 1 is changed from the bandwidth setting unit 24 in the reception device 2 of the base station 20.
• the mode of transmitting information on the main band and the auxiliary band to 16 has been described. However, information regarding the main band and the auxiliary band may be transmitted from the band setting unit 24 in the receiving device 2 in the management server computer (not shown) to the band setting unit 16 in the transmitting device 1.
• the band setting unit 24 of the receiving apparatus 2 may determine the auxiliary band according to the position of the receiving apparatus 2.
• the receiving device 2 of the mobile phone 10 that is a mobile body may appropriately change the band to be used according to the use position of the mobile phone 10.
• the band setting unit 24 includes a position information acquisition unit 248 such as GPS (Global Positioning System).
• the position information acquisition unit 248 acquires position information (latitude and longitude) of the receiving device 2 and outputs the position information to the CPU 241.
• the storage unit 245 stores an auxiliary band that is used in association with the same position information as the auxiliary band table 246 described above.
• the CPU 241 may read the corresponding auxiliary band from the storage unit 245 and output this auxiliary band together with the main band. For example, if the receiving device 2 is located in the city center, the radio wave environment is relatively poor.Therefore, the auxiliary band is set to be small, and conversely if the receiving device 2 is located in the suburbs, the radio wave environment is relative. If you set a lot of auxiliary bandwidth, it will improve.
• FIG. 8 is a block diagram showing a hardware configuration of the use band setting unit 25.
• the used bandwidth setting unit 25 includes a CPU 251, a channel quality monitor unit 253, a bandwidth information storage unit 252, a threshold storage unit 254, and the like.
• the CPU 251 is connected to the hardware units of the used bandwidth setting unit 25 via the bus 255, controls them, and executes each software process according to a control program stored in a memory (not shown).
• the bandwidth information storage unit 252 and the threshold storage unit 254 are semiconductor memories that can be read and written by designating arbitrary addresses.
• the channel quality monitoring unit 253 monitors the communication quality of the main band, the auxiliary band A, and the auxiliary band B based on the communication quality output from the sub-channel quality information generation unit 232 in FIG.
• the value related to the communication quality corresponds to the interference level from other wireless networks (for example, wireless LAN compliant with 802.11).
• the threshold storage unit 254 stores a threshold for a value related to communication quality.
• the threshold storage unit 254 stores an allowable interference level—80 dBm or the like. It is.
• the interference level received by the receiving device 2 is, for example, lOOdmBm, it is below the allowable interference level, so it is determined that there is no other communicator using the band.
• the required received power for a bit error rate 10 5 - l lOdBm to determine using bandwidth communication quality good if: Set.
• the SN (Signa-to-Noise) ratio in the receiving apparatus 2 is a value related to communication quality
• 10db is an allowable SN ratio that is a threshold value
• the band in which the SN ratio in the receiving apparatus 2 is 10db or more is used.
• a value related to communication quality is defined as an interference level, and a criterion for determination is an allowable interference level of 80 dm stored in the threshold storage unit 254.
• a criterion for determination is an allowable interference level of 80 dm stored in the threshold storage unit 254.
• the CPU 251 acquires an interference level, which is a value related to the communication quality of the main band, the auxiliary band A, and the auxiliary band B, from the channel quality monitor unit 253 every 5 ms, for example. Then, the CPU 251 reads out the threshold value stored in the threshold value storage unit 254, for example, the allowable interference level—80 dBm, and determines whether or not the magnitude of the acquired interference level is the allowable interference level of 80 dBm or less. Then, a band with an interference level of ⁇ 80 dBm or less is extracted. The extracted band is determined to have a communication quality of a certain level or more, and the main band, the auxiliary band A or the auxiliary band B is set to each used band and stored in the band information storage unit 252.
• an interference level which is a value related to the communication quality of the main band, the auxiliary band A, and the auxiliary band B, from the channel quality monitor unit 253 every 5 ms, for example. Then, the CPU 251 reads out
• FIG. 9 is a flowchart showing the procedure for setting the used bandwidth.
• the channel quality motor unit 253 sequentially acquires values related to the communication quality output from the sub-channel quality information generation unit 232 at a predetermined timing (step S91).
• the measurement of the interference level which is a value related to communication quality, may be detected by a sensor, not shown.
• the channel quality monitor unit 253 stores the acquired value related to communication quality (step S92).
• the CPU 251 determines whether or not the power has passed a predetermined time (for example, 10 ms) (step S93). If the CPU 251 determines that the predetermined time has passed (NO in step S93), the CPU 251 proceeds to step S91 and repeats the above processing.
• a predetermined time for example, 10 ms
• CPU 251 determines that the predetermined time has elapsed (YES in step S93)
• CPU 251 acquires values relating to the communication quality of the main band and the auxiliary band from channel quality monitor unit 253 (step S94).
• the value related to the communication quality is, for example, the interference level as described above.
• the CPU 251 reads a threshold value (for example, an allowable interference level of 80 dBm) stored in the threshold value storage unit 254 (step S95).
• the CPU 251 extracts a band in which a value related to communication quality is equal to or less than a threshold, specifically, an acquired interference level is equal to or less than an allowable interference level, and sets the band as a use band from the bands existing in the main band and the auxiliary band. (Step S96).
• the CPU 251 stores the used bandwidth in the bandwidth information storage unit 252 (step S97). In this way, the CPU 251 sets a band whose value related to communication quality is equal to or less than a predetermined threshold as a use band for each of the main band, the auxiliary band A, and the auxiliary band B.
• the information on the used band is transmitted to the used band setting unit 17 of the transmission device 1 via the antenna 21 serving as a band information transmitting unit.
• the used band setting unit 17 of the transmission apparatus 1 receives information on the used band via the antenna 113 which is a used band information receiving unit.
• the main band, auxiliary band A, and used band in auxiliary band B may not exist in terms of communication quality.
• the auxiliary bands A and B there may be no use band in the auxiliary bands A and B where interference by other wireless networks is large. In such a case, only the used bandwidth within the main bandwidth is used.
• the second embodiment relates to a mode in which spectrums are distributed and arranged based on arrangement information according to a predetermined rule.
• FIG. 10 is a block diagram showing a hardware configuration of transmitting apparatus 1 according to Embodiment 2
• FIG. 11 is a block diagram showing a hardware configuration of receiving apparatus 2 according to Embodiment 2.
• the transmission apparatus 1 further includes an arrangement information setting unit 151 in addition to the configuration of the first embodiment, and the arrangement information setting unit 151 is connected to the arrangement unit 15.
• the receiving device 2 further includes an arrangement information setting unit 271 in addition to the configuration of the first embodiment, and the arrangement information setting unit 271 is connected to the combining unit 27.
• the arrangement information setting unit 151 in the transmission device 1 stores arrangement information in an internal memory (not shown).
• This arrangement information is information related to a predetermined rule for rearranging the spectrum for the used band. For example, 10 is added to the arrangement of the spectrum to be arranged for the used band, or the first half of the spectrum and This applies to rules such as rearrangement of the rear half.
• common arrangement information (rule) is stored in each of the arrangement information setting unit 151 of the transmitting apparatus 1 and the arrangement information setting unit 271 of the receiving apparatus 2! RU [0068]
• the arrangement information is a rule for shifting the arrangement of spectra to be arranged with respect to the use band by 10.
• FIG. 12 is an explanatory diagram showing an arrangement state of the spares based on the arrangement information.
• the processing unit in the placement unit 15 is 64 spectra, and that the spectrum array exists from I (1) to 1 (64).
• I (11) to 1 (26) are arranged in the use band 1 of the main band
• I (27) to 1 (32) are arranged in the use band 2.
• I (33) to 1 (64) are arranged in the use band b of the auxiliary band B.
• Arrangement unit 15 reads the arrangement information stored in arrangement information setting unit 151, and performs processing for rearranging the arrangement of the spectrum with respect to the used band in accordance with the arrangement information.
• Arrangement information force In the rule that the S spectrum array is shifted by 10 with respect to each of the used bands, I (11) to 1 (14) are arranged in the used band a 1 of the auxiliary band A, and in the used band a2.
• I (15) to 1 (20) are arranged.
• 1 (21) to 1 (36) are arranged in the use band 1 of the main band, and I (37) to 1 (42) are arranged in the use band 2.
• I (43) to 1 (64) and I (1) to 1 (10) are arranged in the use band b of the auxiliary band B.
• the arrangement unit 15 distributes and arranges the spectra in this way, and then transmits digital signals related to these spectra to the receiving device 2.
• the receiving apparatus 2 according to Embodiment 2 is newly provided with an arrangement information setting unit 271.
• the arrangement information setting unit 271 is configured to be able to communicate with the distribution information setting unit 151 of the transmission device 1 via the antenna 113 or the antenna 21, and stores the same arrangement information. That is, in the above example, the transmitting apparatus 1 side stipulates that the spectrum arrangement for the used band is advanced by 10, so that the receiving apparatus 2 side performs processing for returning the spectral arrangement for the used band by 10. It should be noted that the contents of the arrangement information setting unit 151 and the arrangement information setting unit 271 are not shown by the operator at every predetermined period in order to ensure safety.
• the arrangement information setting unit 271 outputs the arrangement information to the combining unit 27.
• the combining unit 27 rearranges the spectrum arrangement in each use band extracted by the extracting unit 26. That is, in the case of the above example, the process of returning the spectrum arrangement by 10 is performed.
• the extraction unit 26 outputs 1 (11) to 1 (14) as the use band al of the auxiliary band A, and 1 (15) to 1 (20) as the use band a2.
• 1 (21) to 1 (36) are output as the use band 1 of the main band
• I (37) to 1 (42) are output as the use band 2.
• I (43) to 1 (64) and 1 (1) to 1 (10) are output as the use band b of the auxiliary band B.
• the combining unit 27 performs processing for returning the spectrum existing in each use band to 10. That is, 1 (1) to 1 (4) is returned to the use band al of the auxiliary band A, and I (5) to 1 (10) is returned to the use band a2. Also, I (11) to 1 (26) is returned to use band 1 of the main band, and I (27) to 1 (32) is returned to use band 2. Further, I (33) to 1 (64) is returned to the use band b of the auxiliary band B. Finally, the combining unit 27 combines these spectra in an appropriate band used by the demodulating unit 28.
• the spectrum is combined in the order of the spectrum existing in the high-bandwidth spectrum that exists in the low-bandwidth band.
• spectrums I (1) to 1 (64) existing in the respective bands are combined in the order of use band al, use band a2, use band 1, use band 2, and use band b.
• the combined spectrum is output to the demodulator 28.
• Embodiment 2 has the above-described configuration, and other configurations and operations are the same as those in Embodiment 1. Accordingly, corresponding portions are denoted by the same reference numerals and detailed description thereof will be made. Is omitted.
• Embodiments 1 and 2 have been described with respect to a mode in which the main band and the auxiliary band are used, Embodiment 3 relates to a mode in which the main band is used.
• FIG. 13 is a block diagram showing a hardware configuration of transmitting apparatus 1 according to the third embodiment.
• FIG. 14 is a block diagram showing a hardware configuration of receiving apparatus 2 according to Embodiment 3.
• transmitter 1 uses only the main band
• spectrum mapping unit 181, IDFT unit 191, and CP adding unit related to the main band are arranged between placement unit 15 and multiplexing unit 114. 101 is provided.
• Arrangement unit 15 distributes and arranges the spectrum in the use band within the main band allocated in advance by band setting unit 16.
• the used band setting unit 25 of the receiving apparatus 2 sets a band that satisfies a predetermined standard for communication quality in the main band as the used band, and outputs the information to the used band setting unit 17 of the transmitting apparatus 1.
• the arrangement unit 15 distributes and arranges the outer bands in the use band output from the use band setting unit 17.
• a digital signal related to the spectrum in the main band including the spectrum distributed in the used band is transmitted to the receiving apparatus 2 via the antenna 113.
• only the main circuit 23 related to the main band is provided between the demultiplexing unit 222 and the extraction unit 26 that perform demodulation processing only in the main band.
• the extracting unit 26 Based on the information on the used band output from the used band setting unit 25, the extracting unit 26 outputs the spectrum existing in the used band to the extracting / combining unit 27.
• the combining unit 27 combines the vectors in the use band output from the extracting unit 26 and outputs the combined vectors to the demodulating unit 28.
• FIG. 15 is an explanatory view showing the concept of spectral dispersion arrangement, extraction, and combining processing according to the third embodiment.
• Fig. 15 (a) shows the spectrum input from the DFT unit 14 to the placement unit 15, and the horizontal axis indicates the frequency. In this example, it is assumed that the number of spectra per processing unit is 64.
• Figure 15 (b) shows the state of the spectrum that is divided in such a way that the continuous spectrum is distributed and used in the main band. This divisional distribution may be performed in accordance with the processing described in FIG. In addition, as described in the second embodiment, the process of rearranging the spectra using the arrangement information may be performed.
• the placement unit 15 calculates the sum s of the used bandwidths output from the used bandwidth setting unit 17. Then, the ratio of the spectrum to be allocated to each used bandwidth is calculated by dividing each used bandwidth by the calculated sum s. Arrangement unit 15 multiplies the ratio of each used band by the sum of spectrums 64 to determine the number of spectra distributed in each used band.
• FIG. 15 (c) shows a main band allocated in advance between the transmission device 1 and the reception device 2.
• the placement unit 15 distributes and arranges the spectrum in a plurality of use bands to be used in the main band based on the information from the use band setting unit 17.
• Fig. 15 (d) is an explanatory diagram showing the used bands 1 to 5 in the main band. The white areas that are not hatched indicate the used bands, and the spectrum is distributed in these used bands. . These bandwidths used The part surrounded by hatching 1 to 5 and FIG. 15 (d) is used in this transmission system S.
• use spectrum 1 has 4 spectral forces use band 2 has 6 spectrum forces use band 3 has 16 spectra
• use band 4 has 6 spectrum forces
• use band 5 has 32 spectra.
• Each is arranged. In this way, 64 spectrums are distributed and arranged in each used band in the main band, and the spectrum force frequency in the main band including the distributed spectrum is converted for one hour and transmitted to the receiving apparatus 2 as a digital signal.
• the extraction unit 26 of the receiving device 2 extracts the spectrum arranged in each of the used bands 1 to 5 in the main band based on the information on the used band output from the used band setting unit 25.
• FIG. 15 (e) As shown in Fig. 4, the 64 spectra are recombined in the coupling unit 27.
• the third embodiment has the above-described configuration, and the other configurations and operations are the same as those in the first and second embodiments. The same reference numerals are assigned to the parts to be described, and detailed description thereof is omitted.

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• Engineering & Computer Science (AREA)
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• Computer Networks & Wireless Communication (AREA)
• Signal Processing (AREA)
• Mobile Radio Communication Systems (AREA)
• Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

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• 2007
  • 2007-06-06 CN CN200780032994.3A patent/CN101512943B/zh not_active Expired - Fee Related
  • 2007-06-06 JP JP2008524736A patent/JP4878626B2/ja not_active Expired - Fee Related
  • 2007-06-06 WO PCT/JP2007/061439 patent/WO2008007506A1/ja active Application Filing

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