WO2006106808A1 - 帯域制御方法及び通信装置 - Google Patents
帯域制御方法及び通信装置 Download PDFInfo
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- WO2006106808A1 WO2006106808A1 PCT/JP2006/306630 JP2006306630W WO2006106808A1 WO 2006106808 A1 WO2006106808 A1 WO 2006106808A1 JP 2006306630 W JP2006306630 W JP 2006306630W WO 2006106808 A1 WO2006106808 A1 WO 2006106808A1
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- Prior art keywords
- bandwidth
- communication device
- communication
- frequency
- data transmission
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Classifications
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- 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
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/143—Two-way operation using the same type of signal, i.e. duplex for modulated signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1694—Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers
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- 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
- H04L5/0037—Inter-user or inter-terminal allocation
Definitions
- the present invention relates to a bandwidth control method and a communication device that performs data communication using the bandwidth control method, and more particularly, to a transmission device that is used for data transmission between two communication devices that communicate in a full-duplex communication system.
- the present invention relates to a bandwidth control method and a communication device that can make maximum use of a trusted frequency band.
- a full-duplex communication method as a method for simultaneously transmitting and receiving data between two communication devices.
- the lines (transmission line and reception line) between the two communication devices must exist without interference.
- the full-duplex communication method adopts the FDD (Frequency Division Duplex) method, and the frequency bands used for transmission and reception are different between the two communication devices.
- the frequency band used for transmission and reception is usually fixed at the time of design in order to prevent interference between the transmission frequency band used for transmission and the reception frequency band used for reception.
- a guard band will be provided between the two frequency bands.
- TDMA Time Division Multiple Access
- Patent Document 1 over the TDMA communication between the base station and the subscriber station (mobile station), the amount of data transmitted from the base station to the subscriber station, and the subscriber station to the base station A method of changing the number of uplink and downlink time slots according to the amount of data transmitted to the network is disclosed.
- Patent Document 1 Japanese Patent Laid-Open No. 2003-274446 Disclosure of the invention
- the amount of communication data between two communication devices communicating in the full-duplex communication method may vary greatly depending on the time.
- the first communication device When making a request for acquiring a large amount of data, the first communication device needs to send a very small amount of data to the second communication device, whereas the second communication device uses the first communication device.
- like videophones there are cases where data is transmitted almost equally between transmission and reception.
- the present invention has been made in view of the above circumstances, and performs communication in the full-duplex communication method so that the transmission band of one communication device is between two communication devices.
- Bandwidth control method that can improve communication efficiency by using one surplus band for the other transmission band when there is a surplus band but the other communication device has insufficient transmission band And to provide a communication device.
- the present invention has the following features.
- the bandwidth control method is a bandwidth control method for controlling a frequency band used when a first communication device and a second communication device perform data transmission.
- the frequency band used when the communication apparatus and the second communication apparatus perform data transmission is a different frequency band, and the first bandwidth required when the first communication apparatus performs data transmission.
- a bandwidth estimation step for estimating a second bandwidth required when the second communication device performs data transmission, a first bandwidth, and the first communication device A bandwidth for comparing the first used bandwidth being used, and comparing the second bandwidth and the second used bandwidth currently used by the second communication device.
- the first bandwidth and the second bandwidth according to the comparison result of the bandwidth comparison step and the bandwidth comparison step.
- the bandwidth estimation step includes the first communication device. Is configured to estimate the first bandwidth, and the second communication device estimates the second bandwidth.
- the first communication device acquires the second bandwidth from the second communication device, and the first communication device The first bandwidth and the first used bandwidth are compared, and the second bandwidth and the second used bandwidth are compared. It is.
- the used bandwidth determination step includes the first bandwidth according to a comparison result compared by the first communication device in the bandwidth comparison step, The second bandwidth is adjusted, and the third bandwidth and the fourth bandwidth are determined.
- the third bandwidth and the fourth bandwidth do not overlap within a predetermined frequency region. It is a feature that is determined.
- the bandwidth estimation step periodically estimates the first bandwidth and the second bandwidth at predetermined time intervals. It is what.
- the bandwidth estimation step includes a step in which the amount of data scheduled to be transmitted is predetermined in at least one of the first communication device and the second communication device.
- the first bandwidth and the second bandwidth are estimated only when the threshold is exceeded for a predetermined time.
- the bandwidth control method adds a priority to data scheduled to be transmitted in at least one of the first communication device and the second communication device, and
- the estimation step is characterized by adding virtual data that is not actually transmitted according to the priority, and estimating the first bandwidth and the second bandwidth.
- the first communication device and the second communication device perform data transmission by directly modulating a carrier frequency with transmission data. It is.
- the first communication device and the second communication is characterized in that data transmission is performed by modulating the carrier frequency with single sideband amplitude after modulating the intermediate frequency with transmission data.
- the first communication device and the second communication device use multicarrier modulation, and the third bandwidth and the fourth bandwidth may be used. Based on the above, data transmission is performed by adjusting the number of carriers of multicarrier modulation.
- the bandwidth control method according to the present invention provides a comparison result that is compared in the bandwidth comparison step.
- the first bandwidth is smaller than the first used bandwidth, or the second bandwidth is
- the first used bandwidth is changed to the third bandwidth, and the second used bandwidth is changed to the fourth bandwidth. It is.
- the used bandwidth determination step includes a third bandwidth, a center frequency of the third bandwidth, the fourth bandwidth, and the second bandwidth.
- the center frequency of the bandwidth of 4 is determined.
- the communication device is a communication device that performs data transmission by controlling a frequency band when performing data transmission with another communication device, the communication device and the other communication device.
- the frequency band used when transmitting data is a different frequency band
- the bandwidth estimation means for estimating the first bandwidth required when the communication apparatus performs data transmission
- Bandwidth acquisition means for acquiring the second bandwidth required when the communication device performs data transmission from the other communication device, the first bandwidth, and the first communication device currently using Bandwidth comparison means for comparing the second used bandwidth and the second used bandwidth currently used by the second communication device.
- the second bandwidth is adjusted, the third bandwidth used when the first communication device performs data transmission, and the fourth bandwidth used when the second communication device performs data transmission.
- a used bandwidth determining means for determining the bandwidth.
- the used bandwidth determining means includes a third bandwidth, a center frequency of the third bandwidth, the fourth bandwidth, and the fourth bandwidth. In bandwidth And determining a heart frequency.
- the communication device includes a transmission unit that transmits data to the other communication device using a third bandwidth and a center frequency of the third bandwidth, Receiving means for receiving data from the other communication device using a bandwidth of 4 and a center frequency of the fourth bandwidth.
- the bandwidth estimation means periodically estimates the first bandwidth at predetermined time intervals.
- the bandwidth estimation means has a predetermined amount of data to be transmitted over a predetermined threshold in a communication device and at least one of the other communication devices over a predetermined time.
- the first bandwidth is estimated only when the frequency falls below the threshold.
- a priority is added to the data scheduled to be transmitted, and the bandwidth estimation means includes: According to the priority, virtual data that is not actually transmitted is added, and the first bandwidth is estimated.
- the communication apparatus is characterized in that the carrier frequency is directly modulated with the transmission data and data transmission is performed.
- the communication device is characterized in that after the intermediate frequency is modulated with the transmission data, the carrier wave frequency is subjected to single sideband amplitude modulation to perform data transmission.
- the communication device uses multicarrier modulation and adjusts the number of carriers in multicarrier modulation based on the third bandwidth and the fourth bandwidth. Data transmission is performed.
- the present invention provides a first bandwidth required when the first communication device performs data transmission, and a second bandwidth required when the second communication device performs data transmission. , Estimate. Then, the first bandwidth and the first used bandwidth currently used by the first communication device are compared, and the second bandwidth and the second communication device are currently using the first bandwidth. Compare the second used bandwidth. Then, depending on the comparison result, the first bandwidth and the second bandwidth. The third bandwidth used when the first communication device performs data transmission, the fourth bandwidth used when the second communication device performs data transmission, It is characterized by determining. As a result, there is an excess bandwidth in the transmission band of one communication device between two communication devices that are communicating by the full-duplex communication method, but the transmission bandwidth of the other communication device is insufficient. In this case, it is possible to use one surplus band for the other transmission band, so even if the amount of communication data between two communication devices varies significantly with time, the efficiency It is possible to transmit data frequently.
- the bandwidth control method performed between communication devices in the present embodiment includes a first communication device (corresponding to radio A) and a second communication device (corresponding to radio B). Is a band control method for controlling the frequency band used when data is transmitted, and the frequency band used when the first communication device (A) and the second communication device (B) perform data transmission. (A 0, BO shown in Fig. 2) are different frequency bands.
- the first bandwidth required when the first communication device (A) performs data transmission and the second bandwidth required when the second communication device (B) performs data transmission. Is estimated.
- the estimated first bandwidth is compared with the first used bandwidth currently used by the first communication device (A), and the estimated second bandwidth is compared with the estimated second bandwidth.
- the second used bandwidth that the second communication device (B) is currently using is compared.
- the first bandwidth and the second bandwidth are adjusted according to the comparison result, and the third bandwidth used when the first communication device (A) performs data transmission.
- the fourth bandwidth used when the second communication device (B) performs data transmission is determined.
- the bandwidth control method in the present embodiment Will be described. In the following embodiments, a description will be given based on the case where a wireless device is applied as a communication device. However, the bandwidth control method of the present invention is not limited to a wireless device, and communication is performed using a full-duplex communication method. It can be applied to all communication devices including wired communication.
- FIG. 1 (a) shows the configuration of radio A
- FIG. 1 (b) is a schematic diagram showing the configuration of radio B.
- the radio device A in the present embodiment includes a control unit 10a, a storage unit 22a, a variable oscillator 12a, a modulator 20a, a variable band filter 14a, and a high-frequency amplifier. 24a and
- the wireless device B in the present embodiment includes a control unit 10b, a storage unit 22b, a variable oscillator 12b, a modulator 20b, a variable band filter 14b,
- the high-frequency amplifier 24b, the transmitting antenna 26b, the receiving antenna 28b, the high-frequency amplifier 30b, the variable band filter 18b, the demodulator 32b, and the variable oscillator 16b are configured.
- the radio A in the present embodiment includes a control unit 10a, a storage unit 22a, and a variable oscillator.
- control unit 10a the receiving antenna 28a, the high-frequency amplifier 30a, and the variable band filter
- Received data is received from radio B by 18a, demodulator 32a, and variable oscillator 16a.
- Radio B in the present embodiment includes a control unit 10b, a storage unit 22b, and a variable oscillator.
- control unit 10b the receiving antenna 28b, the high frequency amplifier 30b, and the variable band filter
- Received data is received from radio A by 18b, demodulator 32b, and variable oscillator 16b.
- the wireless device A and the wireless device B in the present embodiment have a lower limit frequency: Fmin and an upper limit frequency: Fmax specified by laws and regulations.
- Full-duplex communication (for example, packet communication) will be performed.
- full-duplex communication is performed with a lower limit frequency: Fmin of 59 GHz, an upper limit frequency: Fmax of 66 GHz, and a basic transmission rate of 1.25 GHz.
- the wireless device A in the present embodiment transmits data (information) to the wireless device B using the low frequency side band: AO (the bandwidth is also indicated by AO).
- the wireless device B transmits data to the wireless device A using the high frequency band: BO (the bandwidth is also BO).
- the wireless device A receives data from the wireless device B using the band: B.
- the wireless device B receives data from the wireless device A using the band: AO.
- radio A transmits data using the high frequency side band: BO
- radio B transmits data using the low frequency side band: AO
- radio A uses band: A. It is also possible to configure Radio B to receive data using Band: BO.
- control unit 10a of the wireless device A and the control unit 10b of the wireless device B shown in FIG. 1 perform the following settings in order to perform communication.
- Control unit 10a of radio device A sets the oscillation frequency of variable oscillator 12a on the transmission side to Fa, sets the passband of variable band filter 14a to AO, and sets the center frequency to Fa.
- the oscillation frequency of the variable oscillator 16a on the receiving side is set to Fb
- the passband of the variable band filter 18a is set to BO
- the center frequency is set to Fb.
- control unit 10b of the radio B sets the oscillation frequency of the variable oscillator 12b on the transmission side to Fb, sets the passband of the variable band filter 14b to BO, and sets the center frequency to Fb. Furthermore, set the oscillation frequency of the variable oscillator 16b on the receiving side to Fa, set the passband of the variable band filter 18b to AO, and set the center frequency to Fa. [0050] Also, in radio A, modulator 20a modulates the carrier frequency (oscillation frequency Fa of variable oscillator 12a) with the transmission data stored (stored) in storage unit 22a.
- modulation scheme in this embodiment can be applied to any modulation scheme that is not particularly limited.
- ASK Amplitude Shift Keying
- PSK Phase Shift Keying
- QAM Quadrature Amplitude Modulation
- various modulation schemes such as FSK (Frequency Shift Keying) can be applied.
- the carrier frequency Fa modulated by the modulator 20a is radiated into the air from the transmission antenna 26a via the variable band filter 14a (bandwidth is set to AO) and the high frequency amplifier 24a.
- the wireless device A can transmit the transmission data to the wireless device B.
- Radio unit B demodulates the transmission data from radio unit A received by reception antenna 28b via high frequency amplifier 30b and variable band filter 18b (bandwidth is set to AO). Supply to 32b.
- the demodulator 32b demodulates the original signal transmitted from the radio A using the oscillation frequency Fa from the variable oscillator 16b to generate reception data.
- the wireless device A modulates the oscillation frequency Fa set in the variable oscillator 12a with the transmission data stored in the storage unit 22a, and the variable band filter (bandwidth: A0, center frequency). Wave number Fa) is transmitted to radio B via 14a. Radio B then outputs the received data that also received radio A power to demodulator 32b via variable band filter (bandwidth: A0, center frequency Fa) 18b, and the oscillation set in variable oscillator 16b. Demodulate at frequency Fa to generate received data.
- the process in which the wireless device B transmits the transmission data stored in the storage unit 22b to the wireless device A, and the wireless device A receives the transmission data from the wireless device B and generates the reception data. Will perform the same processing as described above.
- the wireless device A and the wireless device B in the present embodiment determine the optimum frequency band to be used in the next communication period (described later) during the communication between the wireless device A and the wireless device B described above. Then, the communication is temporarily suspended so that the wireless device A and the wireless device B can communicate in the determined optimum frequency band, and the constants of the electronic circuit are changed. After that, in the next communication period, communication between radio A and radio B is resumed using the above-mentioned optimum frequency band. [0056] Next, the processing operation for determining the optimum frequency band to be used in the next communication period will be described with reference to FIGS.
- Fig. 3 shows processing operations at the time of obtaining frequency bands (A1 and B1) to be used in the next communication period periodically (for example, every 10 msec) in the radio device A and the radio device B. It is a figure. Based on the frequency bands (A1 and B1) obtained in Fig. 3, the optimum frequency bands (A2 and B2) to be used in the next communication period are determined by performing the processing operation shown in Fig. 4. .
- the “next communication period” described above is changed from the "time interval for determining the optimum frequency band periodically (for example, 10 msec)" to the "wireless device". This is the period after subtracting the period during which communication between A and radio B is temporarily suspended.
- the “period of temporarily interrupting communication between radio A and radio B” is an extremely short time, in this embodiment, in order to simplify the explanation, it is periodically In the case of determining the optimum frequency band, the “next communication period” described above is assumed to be approximately equal to the “time interval (for example, 10 msec) for periodically determining the optimum frequency band”.
- the control unit 10a of the wireless device A shown in FIG. 1 determines the frequency band control according to the data amount scheduled to be transmitted in the next transmission period (communication period). At the same time, a start signal for starting the determination of the frequency band control is superimposed on the data currently being transmitted and transmitted to the radio B. That is, the control unit 10a calculates the bandwidth A1 from the data amount scheduled to be transmitted in the next transmission period (communication period) stored in the storage unit 22a (step S10).
- control unit 10b of wireless device B determines frequency band control according to the amount of data scheduled to be transmitted in the next transmission period (communication period). Start. That is, the control unit 10b calculates the bandwidth B1 for the amount of data scheduled to be transmitted in the next transmission period (communication period) stored in the storage unit 22b, and the calculation result (data indicating the bandwidth B1) Is superimposed on the data currently being transmitted and transmitted to the wireless device A (step S12).
- control unit 10a (and the control unit 10b) is capable of calculating the bandwidth A1 according to the amount of data scheduled to be transmitted in the next transmission period (communication period), for example, stored in the storage unit 22a. Assume that the amount of data is 10Mbit. And the next communication period (update time interval) If it is 10msec as described above, the transmission speed will be lOOOMbit / s. If the modulation method is BPSK (Binary Phase Shift Keying), the transmission speed is lOOOMsymbol / s because it is lbit / symbol. If 1 Hz is required per lsymbol, the required bandwidth is 1000 MHz.
- BPSK Binary Phase Shift Keying
- step S14 the control unit 10a of the wireless device A takes in the calculation result (data indicating the bandwidth B1) sent from the wireless device B.
- control unit 10a of the wireless device A can acquire the transmission bandwidth A1 of the wireless device A and the transmission bandwidth B1 of the wireless device B.
- bandwidth A1 and bandwidth B1 are obtained, if wireless device A and wireless device B can independently accurately specify the start point of frequency band control, then wireless device A In S10, it is not necessary to transmit “start signal for starting determination of frequency band control” to radio B, and radio B does not need to respond to “start signal” in step 12. Obviously.
- radio devices A and B can independently accurately specify the start point of frequency band control
- the control unit 10a of radio device A and the control unit 10b of radio device B have a predetermined period (for example, For example, the frequency band control is controlled every time it is determined that 10 msec) has elapsed.
- the radio device A performs the frequency band control, but may be performed by the radio device B.
- the processing operation shown in FIG. 3 it is decided to periodically calculate the transmission bandwidth A1 and the transmission bandwidth B1 required by the wireless devices A and B according to the data amount scheduled to be transmitted. If the amount of data scheduled to be transmitted (required transmission bandwidth) does not change in the last multiple communication periods, or if the change width is small even if it changes, it will be periodically It is also possible to construct so as not to perform frequency band control.
- the wireless device A and the wireless device B regularly check the amount of data scheduled to be transmitted, and the confirmed amount of data to be transmitted continuously falls below a predetermined threshold for a predetermined time. Only when it is determined that the frequency band has been rotated, it may be determined that there is a surplus (surplus) in the current frequency bandwidth, and the frequency band control may be performed. In this case, if Radio A determines that the amount of data scheduled to be transmitted has fallen below a predetermined threshold for a predetermined time continuously, the step of FIG. As in S10, the start signal is transmitted to the wireless device B.
- the wireless device A calculates the bandwidth B1 as shown in step S12 of FIG. Send to. In response to this, the wireless device A calculates the bandwidth A1 based on the data amount scheduled to be transmitted.
- the bandwidths A1 and Z or the bandwidth B1 by giving priority to each of the data packets scheduled to be transmitted. For example, packet data with a priority of 0 is left as it is with the amount of data that is actually scheduled to be transmitted, and a higher priority packet has more empty data (data that is not actually transmitted). In this way, when there is a large amount of high priority data, the total amount of data scheduled to be transmitted increases, so the bandwidth A1 (B1) can be increased.
- the number of priorities other than priority zero may be singular or plural. Empty data is added only to calculate bandwidth A1 (B1), and is deleted (ignored) during actual transmission.
- control unit 10a of the wireless device A performs the processing operation shown in FIG. 4 after performing the processing operation shown in FIG.
- step S16 of FIG. 4 the control unit 10a of the wireless device A compares the bandwidth A1 calculated in step S10 of FIG. 3 with the bandwidth AO currently used by the wireless device A for transmission.
- the bandwidth B1 of the wireless device B acquired in step S14 in FIG. 3 is compared with the bandwidth BO currently used by the wireless device B for transmission. From these comparison results, the following four types of comparison results are obtained.
- step S 16 Next, the first to fourth processes based on the four types of comparison results obtained in step S 16 will be described.
- the first process is the first comparison result (A1 ⁇ AO and Bl> B0).
- the excess (excessive) bandwidth (AO—A1) is allocated to the wireless device B. Used as a transmission band for Accordingly, the bandwidth A2 used by the wireless device A and the bandwidth B2 used by the wireless device B in the next communication period are determined by the following equation (1).
- the bandwidth A2 used by the wireless device A and the bandwidth B2 used by the wireless device B in the next communication period are determined by the following equation (2).
- the third process is the third comparison result (A1
- the fourth process is the case of the fourth comparison result ( ⁇ 1 ⁇ and B1 ⁇ ) as shown in step S24 of FIG.
- the bandwidth A2 used by the wireless device A and the bandwidth B2 used by the wireless device B in the next communication period are determined by the following equation (4).
- the center frequency FA of the bandwidth A2 and the center frequency FB of the bandwidth B2 are calculated (step S26), and the radio A is the new band information A2 , B2, FA, and FB are superimposed on the currently communicated data and transmitted to Radio B.
- the wireless device A and the wireless device B within the control time before the start of the next data transmission period, based on the band information A2, B2, FA, FB described above, the variable oscillators 12a, 12b, In addition to setting the oscillation frequencies of 16a and 16b, the passband and center frequency of the variable band-pass filters 14a, 14b, 18a and 18b are set.
- time from the start to the end of the frequency band control described above is, for example, about lOnsec.
- the wireless device A estimates the first bandwidth: A1, which is necessary when performing data transmission, based on the amount of data scheduled to be transmitted. Also, similarly to the wireless device A, the wireless device B estimates the second bandwidth B1 required for data transmission based on the amount of data scheduled to be transmitted. Next, wireless device A obtains information of the second bandwidth: B1 from wireless device B, and wireless device A has the first bandwidth: A1 and the first bandwidth currently used by wireless device A. Compared with the first used bandwidth: AO, the second bandwidth: B1 is compared with the second used bandwidth: BO currently used by the radio B. Then, according to the comparison result, as shown in FIG.
- the first bandwidth: A1 and the second bandwidth: B1 are adjusted, and the wireless device A is used when performing data transmission.
- Bandwidth of 3: A2 and its third bandwidth: Center frequency of A: FA and radio: B transmits data
- the band information: A2, B2, FA, and FB of the fourth bandwidth: B2 and the fourth bandwidth: B2 center frequency: FB are determined. Then, the determined bandwidth information: A2, B2, FA, and FB are set in the wireless device A and the wireless device B.
- the radio of the second embodiment after converting the transmission data into an IF (Intermediate Frequency) signal, performs single-sideband amplitude modulation, passes through a variable band filter, and transmits. On the other hand, the received signal is demodulated by changing to an IF signal after passing through a variable bandpass filter.
- IF Intermediate Frequency
- FIGS. 6 and 7. FIG.
- the frequency band control in the radio device of the second embodiment is the same control as that of the radio device of the first embodiment described above, but this is different because the constant change of circuit elements is different. The following will be described mainly.
- FIG. 6 (b) is a schematic diagram showing the configuration of radio D.
- the wireless device C in the second embodiment includes a control unit 10a, a storage unit 22a, a variable oscillator 52a, an IF modulator 50a, a variable oscillator 54a, Single sideband mixer 5 6a, variable band filter 58a, high frequency amplifier 24a, transmit antenna 26a, receive antenna 28a, high frequency amplifier 30a, variable band filter 64a, variable oscillator 60a, single side A waveband mixer 66a, an IF demodulator 68a, and a variable oscillator 62a are included.
- the radio D in the second embodiment includes a control unit 10b, a storage unit 22b, a variable oscillator 52b, an IF modulator 50b, and a variable oscillator 54b.
- the wireless device C and the wireless device D are configured to have the same functions as those of the wireless device A and the wireless device B of the first embodiment, the circuit components ( Components identical to those of (Unit) are designated by the same reference numerals and their description is omitted.
- the wireless device C communicates with the bandwidth AO
- the wireless device D communicates with the bandwidth B0.
- the IF modulator 50a modulates the oscillation frequency Fla from the variable oscillator 52a with the data stored in the storage unit 22a, and outputs an IF signal (bandwidth: A0, center frequency: Fla) (FIG. (See 7 (a)).
- This IF signal is modulated by a single sideband mixer 56a connected to the variable oscillator 54a with V and carrier frequency FSa, and only one sideband is variable bandpass filter (bandwidth: A0) 58a. Is output. If the center frequency of the variable bandpass filter 58a is FRa, the following equation (5) is established.
- the IF modulator 50b modulates the oscillation frequency Fib from the variable oscillator 52b with the data stored in the storage unit 22b and outputs an IF signal (bandwidth: BO, center frequency: Fib) ( (See Figure 7 (b)).
- This IF signal is input to the single sideband mixer 56b connected to the variable oscillator 54b and then modulated at the carrier frequency FSb, and only one sideband is output to the variable bandpass filter (bandwidth: BO) 58b.
- BO variable bandpass filter
- FRb FSb, Fib,
- the radio device C and the radio device D of the second embodiment have the lower limit frequency and the upper limit frequency that are set (restricted), respectively, as in the first embodiment.
- F min, upper limit frequency If Fmax, the control unit 10a causes the oscillation frequency Fla and FIb to be the center so that the bandwidth AO and bandwidth BO currently in use are not overlapped between Fmin and Fmax.
- the frequencies FRa and FRb will be set.
- the oscillation frequency of the variable oscillator 60a on the receiving side of the radio C is FSb
- the oscillation frequency of the variable oscillator 62a is Fib
- the bandwidth of the variable band filter 64a is BO
- the center frequency is FRb.
- the signal received by the receiving antenna 28a is amplified by the high-frequency amplifier 30a, converted to an IF signal by the single sideband mixer 66a through the variable band filter 64a, and the IF demodulator 68a. Received data is output from.
- the receiving side of radio D is the same as the receiving side of radio C described above, except for the set oscillation frequency and the like. That is, the oscillation frequency of the variable oscillator 60b is FSa, and the oscillation frequency of the variable oscillator 62b is Fla.
- the bandwidth of variable band filter 64b is A
- the center frequency is FRa.
- the signal received by the receiving antenna 28b is amplified by the high-frequency amplifier 30b, converted into an IF signal by the single sideband mixer 66b through the variable band filter 64b, and from the IF demodulator 68b. Received data is output.
- wireless device C and the wireless device D in the second embodiment are the same as in the first embodiment.
- the optimum frequency band to be used in the next communication period is determined, and communication is temporarily performed so that radio C and radio D can communicate in this optimum frequency band. Suspend and change electronic circuit constants. After that, communication between radio C and radio D is resumed in the next communication period.
- Radio capacity C and radio equipment D respectively determine the data volume power frequency bands A1 and B1 to be transmitted, compare AO and A1, and compare BO and B1 to determine the optimal frequency bands A2 and B2. That is, the same processing as in the first embodiment is performed.
- the variable frequency oscillators 52a, 54a, 52b and 54b on the transmission side are arranged so that the obtained optimum frequency bands A2 and B2 do not overlap between the lower limit frequency: Fmin and the upper limit frequency: Fmax.
- the center frequency of the variable band filters 58a and 58b on the transmission side is determined. After that, before resuming communication, the transmitting side of Radio C and Radio D In this case, the circuit unit on the receiving side is set.
- the radio of the second embodiment modulates the carrier frequency with a single sideband amplitude after modulating the intermediate frequency with the transmission data, and transmits to the radio C and the radio D that perform data transmission.
- the radio of the second embodiment by performing the same frequency band control as in the first embodiment, there is a surplus in the transmission band of one radio unit between the two radio units C and D communicating with the full-duplex communication method.
- the transmission bandwidth of the other radio is insufficient, it is possible to use one surplus bandwidth for the other transmission bandwidth. Even if the amount of exchange data changes significantly with time, it is possible to transmit data efficiently.
- both of the wireless devices C and D each have a transmission band required according to the scheduled transmission data amount.
- the data transmission amount (required bandwidth) does not change the previously set desired value power during multiple continuous communication periods, or even if it changes If the change width is small, it is possible not to perform frequency bandwidth control periodically.
- Variable-band finoletas 58a, 58b, 64a, 64bi, as shown in Fig. 8 [As shown, multiple fixed-band finoletas 70a to 70n are connected in parallel, and multiple fixed The medium force of the bandpass filters 70a to 70n is also characterized in that a specific fixed bandpass filter is selected and full duplex communication is performed using the selected fixed bandpass filter.
- the frequency band control described above can be performed using a plurality of fixed band filters without using a variable band filter, and thus the cost of the radio can be reduced. . Also, by using a plurality of fixed band filters, it is possible to select a specific fixed band filter and perform full duplex communication using the selected fixed band filter, thereby improving communication quality. It becomes possible.
- a specific fixed band filter When a specific fixed band filter is selected, a control signal for selecting a specific fixed band filter is output from the control unit 10a or the like to the selector 71, and the selector 71 outputs the control signal.
- the switch 72 is switched so as to use a specific fixed band filter from among the plurality of fixed band filters 70a to 70n connected in parallel.
- the configuration shown in FIG. 8 is merely an example, and a specific fixed band filter is selected as the medium force of the plurality of fixed band filters 70a to 70n, and full duplex communication is performed using the selected fixed band filter. Any configuration can be applied if possible.
- 52a, 52b, 54a, 54b, 62a, 62b, 60a, 60bi, Fig. 9 [As shown here, multiple fixed oscillators 74a to 74n are connected in parallel, and control signals from the control unit 10a, etc. In addition, a specific fixed oscillator is selected from the plurality of fixed oscillators 74a to 74n, and full-duplex communication is performed using the selected fixed oscillator.
- the frequency band control described above can be performed using a plurality of fixed oscillators without using a variable oscillator, and thus the cost of the radio can be reduced.
- a plurality of fixed oscillators it is possible to select a specific fixed oscillator and perform full-duplex communication using the selected fixed oscillator, which can improve communication quality. It becomes possible.
- a control signal for selecting a specific fixed oscillator such as the control unit 10a is output to the selector 71, and the selector 71 receives the control signal. Based on the signal, the switch 72 is switched to use a specific fixed oscillator from among the plurality of fixed oscillators 74a to 74n connected in parallel.
- the configuration shown in FIG. 9 is an example, and a specific fixed oscillator can be selected from a plurality of fixed oscillators 74a to 74n, and full-duplex communication can be performed using the selected fixed oscillator. Any configuration can be applied.
- the radio of the fifth embodiment uses multicarrier modulation, performs frequency band control in the same manner as the first embodiment described above, and determines the optimum frequency band to be used in the next communication period. Then, based on the determined optimum frequency band, data transmission is performed by adjusting the number of carriers of multicarrier modulation.
- data transmission is performed by adjusting the number of carriers of multicarrier modulation.
- the radio of the fifth embodiment divides the serial data to be transmitted into a plurality of substreams using serial Z parallel transformation ⁇ 80a, and supports these substream data.
- the modulators 82a to 82n different carriers are modulated, and the modulated substreams are synthesized again in the synthesizer 86a, and the synthesized data is transmitted. If the total number of channels is N and the total frequency bandwidth used is W, the bandwidth of each substream is WZN. Multi-carrier modulation can reduce the bit rate of the substream, so that it can be strong against fading.
- radio device of the fifth embodiment shown in FIG. 10 has the same reference to the circuit unit corresponding to the circuit unit shown by the radio device C of the second embodiment shown in FIG. 6 (a). A number (sign) is used.
- the wireless device of the fifth embodiment transmits data using the bandwidth AO and receives data using the bandwidth BO from the wireless device (not shown).
- the serial data from the storage unit 22a storing transmission data is divided into a plurality of substreams in the serial Z parallel converter 80a, and the modulator is changed according to the control information from the control unit 10a.
- IF modulated using all or part of 82a-82n and corresponding It is sent to the synthesizer 86a through the filter (all or part of 84a to 84n).
- the synthesizer 86a determines whether any substream force is output based on the control information from the control unit 10a, combines the data, and outputs an IF signal.
- the IF signal is modulated by the oscillation frequency (carrier frequency) of the variable oscillator 54a in the single sideband mixer 56a connected to the variable oscillator 54a, and only the sideband on one side is a variable band filter ( Passband width: A0, center frequency: FRa) is output to 58a. Note that the passband width: AO and the center frequency: FRa in the variable band filter 58a are set by the control unit 10a.
- variable band filter 58a The output data of the variable band filter 58a is emitted from the transmitting antenna 26a via the high frequency amplifier 24a.
- variable band filter (passband width: B0, center frequency: FRb) 64a via a receiving antenna 28a and a high frequency amplifier 30a.
- the passband width B0 and the center frequency FRb in the variable band filter 64a are set by the control unit 10a.
- the output data of the variable band filter 64a is output to the single sideband mixer 66a connected to the variable oscillator 60a, converted into an IF signal, and output to the distributor 100a. Since control information indicating which channel is used from the control unit 10a is added to the distributor 100a, the channel for distributing output data is known. Accordingly, distributor 100a distributes data to the corresponding demodulator (all or part of 104a to 104n) via all or part of the plurality of filters 102a to 102n. Data from the demodulator 104a to 104 ⁇ is converted to serial data by the parallel ⁇ serial conversion 106a (which is instructed by the control unit 10a to determine which channel power is output), and received data is obtained. .
- the radio of the fifth embodiment is the same as that of the first and second embodiments during the communication between the radio shown in FIG. 10 and a radio not shown.
- the optimal frequency band to be used in the communication period is determined, and communication is temporarily suspended so that both radios can communicate in this optimal frequency band, and the constants of the electronic circuit are changed. After that, communication between the radio shown in Fig. 10 and a radio not shown is resumed in the next communication period.
- frequency bands Al and Bl are obtained, AO and A1 are compared, BO and B1 are compared, and optimal frequency bands A2 and B2 are determined.
- the lower limit frequency is determined based on the optimum frequency bands A2 and B2.
- Fmin and upper limit frequency The control unit 10a selects a channel to be used so that it does not overlap between Fmax (ie, which carrier among a plurality of channels is selected for modulation or demodulation), and those Is transmitted to a radio (not shown). Thereafter, before restarting communication, the control unit 10a sends a control signal to the serial Z parallel conversion 80a, the combiner 86a, the distributor 100a, and the normal Z serial converter 106a to set the circuit constant. On the other hand, the circuit constants are set for a radio (not shown) as well as the radio shown in FIG.
- both of the wireless devices require the transmission bandwidth A1 and the transmission bandwidth A1 required according to the scheduled transmission data amount.
- the data transmission amount (necessary bandwidth) does not change the previously set desired value in multiple consecutive communication periods, or the change width is small even if it changes However, it is possible not to perform frequency bandwidth control periodically.
- an OFDM (Orthogonal Frequency Division Multiplexing) method capable of performing multicarrier modulation and demodulation at once may be applied. Is possible.
- FIG. 1 is a diagram for explaining a configuration of a wireless device according to a first embodiment.
- FIG. 2 is a diagram for explaining the first embodiment.
- FIG. 3 is a first flowchart for explaining the control operation of the radio device in the first embodiment.
- FIG. 4 is a second flowchart for explaining the control operation of the radio in the first embodiment. It is
- FIG. 5 is a diagram for explaining the first embodiment.
- FIG. 6 is a diagram for explaining a configuration of a wireless device according to the second embodiment.
- FIG. 8 is a diagram for explaining a configuration of a radio device in the third embodiment, and is a diagram showing a modification of the variable filter used in the radio device in the first and second embodiments.
- FIG. 9 is a diagram for explaining a configuration of a radio device according to the fourth embodiment, and is a diagram showing a modification of the variable oscillator used in the first and second embodiments.
- FIG. 10 is a diagram for explaining a configuration of a wireless device according to a fifth embodiment.
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Abstract
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JP2007512838A JP4760828B2 (ja) | 2005-04-04 | 2006-03-30 | 帯域制御方法及び通信装置 |
US11/910,572 US8045580B2 (en) | 2005-04-04 | 2006-03-30 | Band control method and communication apparatus |
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US (1) | US8045580B2 (ja) |
JP (1) | JP4760828B2 (ja) |
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US20090238206A1 (en) | 2009-09-24 |
WO2006106808A8 (ja) | 2007-11-01 |
US8045580B2 (en) | 2011-10-25 |
JPWO2006106808A1 (ja) | 2008-09-11 |
JP4760828B2 (ja) | 2011-08-31 |
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