WO2012035638A1 - Procédé de communication sans fil, station relais, station de base et station mobile - Google Patents

Procédé de communication sans fil, station relais, station de base et station mobile Download PDF

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Publication number
WO2012035638A1
WO2012035638A1 PCT/JP2010/066086 JP2010066086W WO2012035638A1 WO 2012035638 A1 WO2012035638 A1 WO 2012035638A1 JP 2010066086 W JP2010066086 W JP 2010066086W WO 2012035638 A1 WO2012035638 A1 WO 2012035638A1
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WO
WIPO (PCT)
Prior art keywords
station
signal
base station
relay
radio signal
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PCT/JP2010/066086
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English (en)
Japanese (ja)
Inventor
喜幸 太田
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富士通株式会社
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Publication date
Application filed by 富士通株式会社 filed Critical 富士通株式会社
Priority to PCT/JP2010/066086 priority Critical patent/WO2012035638A1/fr
Publication of WO2012035638A1 publication Critical patent/WO2012035638A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2603—Arrangements for wireless physical layer control
    • H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations

Definitions

  • the embodiment discussed in this specification relates to a relay station control technique for relaying wireless communication between a base station and a mobile station.
  • a method of relaying wireless communication between a base station and a mobile station using a relay station has been put into practical use.
  • An example of such a relay station is a repeater, for example.
  • the relay station receives the radio signal transmitted from the base station, amplifies the radio signal, and transmits it to the mobile station. Further, the relay station receives a radio signal transmitted from the mobile station, amplifies the radio signal, and transmits it to the base station.
  • time lag information related to relay delay associated with relay processing at a radio relay station is set in the radio base station, and relay reception timing at a radio terminal communicating with the radio base station via the radio relay station is set as time lag information.
  • relay reception timing at a radio terminal communicating with the radio base station via the radio relay station is set as time lag information.
  • a direct reception timing at a wireless terminal directly communicating with a wireless base station is determined, and a transmission timing of a message to be received at the wireless terminal is controlled based on each determined reception timing.
  • a radio signal transmitted from a mobile station is received by a base station.
  • the base station receives a signal coming directly from the mobile station and a signal passing through the relay station.
  • a signal that directly arrives from a transmitting station to a receiving station without passing through a relay station may be referred to as a “direct signal”.
  • a signal passing through the relay station may be referred to as “relay signal”.
  • the relay signal is received by the base station with a predetermined delay after the direct signal is received.
  • the relay signal becomes an interference wave and degrades the signal quality of the received signal. The same applies when the mobile station receives a radio signal transmitted from the base station.
  • An object of the apparatus and method according to the embodiment is to prevent deterioration of the quality of a received signal caused by delay of a relay signal.
  • a radio communication method used in a radio communication system having a relay station that relays a radio signal transmitted from a base station to a mobile station the base station transmits a radio signal to the mobile station
  • the relay station receives the radio signal transmitted from the base station to the mobile station, transmits the radio signal to the mobile station
  • the mobile station The base station receives the radio signal transmitted from the base station directly and / or via the relay station, and the base station receives, at the mobile station, the first received power that is the received power when the radio signal is received at a certain timing
  • a control signal for restricting the operation of the relay station is transmitted to the relay station based on the relationship with the second received power, which is the received power when a radio signal is received with a predetermined time delay from this timing.
  • a relay station that relays a radio signal transmitted from the base station to the mobile station.
  • the relay station transmits from the base station based on the relationship between the received power when the mobile station receives the radio signal at a certain timing and the received power when the radio signal is received with a predetermined time delay from this timing.
  • a receiving unit that receives the received control signal, and a control unit that performs control for restricting operations related to relay of the radio signal in the local station based on the received control signal.
  • a base station used in a radio communication system having a relay station that relays a radio signal transmitted from a base station to a mobile station.
  • the base station regulates the operation of the relay station based on the received power when the mobile station receives the radio signal at a certain timing and the received power when the radio signal is received with a predetermined time delay from this timing.
  • a transmission unit that transmits a control signal to be transmitted.
  • a mobile station used in a radio communication system having a relay station that relays a radio signal transmitted from a base station to the mobile station.
  • the mobile station receives a radio signal transmitted from the base station to itself, directly from the base station and / or via the relay station, and a received signal when the radio signal is received at a certain timing.
  • a transmission unit that transmits information about a relationship with received power when a radio signal is received with a predetermined time delay from the timing to the base station.
  • a radio communication method used in a radio communication system having a relay station that relays a radio signal transmitted from a mobile station to a base station the mobile station transmits a radio signal to the base station
  • the relay station receives the radio signal transmitted from the mobile station to the base station, transmits the radio signal to the base station
  • the base station A radio signal transmitted from a mobile station is received directly from the mobile station and / or via a relay station, and the base station delays a predetermined time from the received power when the radio signal is received at a certain timing. Then, based on the relationship with the received power when the radio signal is received, a control signal for restricting the operation of the relay station is transmitted to the relay station.
  • a relay station that relays a radio signal transmitted from the mobile station to the base station.
  • the relay station transmits from the base station based on the relationship between the received power when the base station receives the radio signal at a certain timing and the received power when the radio signal is received with a predetermined time delay from this timing.
  • a receiving unit that receives the received control signal, and a control unit that performs control for restricting operations related to relay of the radio signal in the local station based on the received control signal.
  • a transmission unit that transmits a control signal that regulates the operation of the relay station based on the power and the received power when a radio signal is received with a predetermined time delay from the timing.
  • 1 is an overall view of a first example of a wireless communication system. It is a block diagram of the 1st example of a base station. It is a figure which shows the structural example of an inverse fast Fourier-transform part. It is a figure which shows the structural example of a wireless transmission part and a wireless reception part. It is a figure which shows the structural example of a fast Fourier-transform part. It is a figure which shows the structural example of a deterioration determination part. It is a block diagram which shows the structural example of a modulation part. It is a block diagram of the 1st example of a relay station. It is explanatory drawing of the 1st example of a process of a base station.
  • FIG. 1 is an overall view of a first example of a wireless communication system.
  • the wireless communication system 1 includes a base station 2, a mobile station 3, and a relay station 4.
  • Reference symbol S1 indicates a direct signal that arrives directly at the base station 2 without being relayed by the relay station 4 after being transmitted from the mobile station 3 in the uplink.
  • Reference symbol S ⁇ b> 2 indicates a relay signal that arrives at the base station 2 after being transmitted from the mobile station 3 and relayed by the relay station 4.
  • a signal that arrives directly from the base station 2 to the mobile station 3 without being relayed to the relay station 4 may be referred to as a direct signal.
  • a signal transmitted from the base station 2 and then relayed by the relay station 4 and arriving at the mobile station 3 may be referred to as a relay signal.
  • FIG. 2 is a configuration diagram of a first example of the base station 2.
  • the base station 2 includes a signal processing unit 10, an encoding unit 11, a modulation unit 12, an inverse fast Fourier transform unit 13, a radio transmission unit 14, and an antenna 15.
  • the base station 2 includes a radio reception unit 16, a fast Fourier transform unit 17, a reference signal extraction unit 18, a channel estimation unit 19, a demodulation unit 20, a decoding unit 21, and a degradation level determination unit 22.
  • the inverse fast Fourier transform unit may be referred to as an “IFFT unit”.
  • the fast Fourier transform unit may be referred to as an “FFT unit”.
  • the signal processing unit 10 converts the signal format received from the wired network into a signal format transmitted over the wireless communication channel and transmitted to the mobile station 3.
  • the encoding unit 11 encodes the downlink signal received from the wired network.
  • the modulation unit 12 modulates the subcarrier with the encoded signal.
  • the IFFT unit 13 generates an Orthogonal Frequency Division (OFDM) signal by generating a time domain signal having a modulated subcarrier in each frequency component.
  • FIG. 3 is a diagram illustrating a configuration example of the IFFT unit 13.
  • the IFFT unit 13 includes a serial / parallel conversion unit 30, an inverse fast Fourier transform processing unit 31, a parallel / serial conversion unit 32, and a cyclic prefix insertion unit 33.
  • the serial / parallel converter may be referred to as an “S / P converter”.
  • the inverse fast Fourier processing unit may be referred to as an “IFFT processing unit”.
  • the parallel-serial conversion unit may be referred to as “P / S conversion unit”.
  • the cyclic prefix insertion part may be referred to as “CP insertion part”.
  • the S / P converter 30 converts the serial data received from the modulator 12 into parallel data having a bit width corresponding to the number of subcarriers.
  • the IFFT processing unit 31 generates a time domain signal by performing inverse Fourier transform on the converted parallel data.
  • the P / S converter 32 converts each discrete time symbol output from the IFFT processor 31 into serial data.
  • the CP insertion unit 33 inserts a cyclic prefix into the time domain signal output from the P / S conversion unit 32.
  • the wireless transmission unit 14 converts the output signal from the IFFT unit 13 into an analog signal and up-converts it to a radio frequency signal.
  • the radio frequency signal is transmitted to the mobile station 3 via the antenna 15.
  • the wireless reception unit 16 receives a direct signal from the mobile station 3 or a relay signal from the relay station 4 via the antenna 15.
  • the radio receiving unit 16 converts these received signals into intermediate frequency signals and then converts them into digital signals.
  • FIG. 4 is a diagram illustrating a configuration example of the wireless transmission unit 14 and the wireless reception unit 16.
  • the wireless transmission unit 14 includes a digital / analog converter 40, an up-converter 41, a local oscillation signal generation unit 42, a transmission amplifier 43, and a duplexer 44.
  • the wireless reception unit 16 includes a reception amplifier 50, a down converter 51, and an analog / digital converter 52.
  • the digital-analog converter may be expressed as “DAC”.
  • the analog-digital converter may be referred to as “ADC”.
  • the duplexer may be referred to as “DUP”.
  • the DAC 40 converts the output signal of IFFT unit 13 into an analog signal.
  • the up-converter 41 up-converts the output signal of the DAC 40 to a radio frequency signal by multiplying the output signal from the DAC 40 by a local signal.
  • the local signal generator 42 generates a local signal to be supplied to the up converter 41 and the down converter 51.
  • the transmission amplifier 43 amplifies the radio frequency signal output from the up-converter 41.
  • the signal amplified by the transmission amplifier 43 is transmitted from the base station 2 via the DUP 44 and the antenna 15.
  • the direct signal and the relay signal received via the antenna 15 are input to the reception amplifier 50 via the DUP 44.
  • the reception amplifier 50 amplifies the reception signal.
  • the down-converter 51 down-converts the received signal into an intermediate frequency signal by multiplying the amplified received signal by the local signal.
  • the ADC 52 converts the intermediate frequency signal into a digital signal.
  • the intermediate frequency signal converted into the digital signal is output to the FFT unit 17.
  • FIG. 5 is a diagram illustrating a configuration example of the FFT unit 17.
  • the FFT unit 17 includes a cyclic prefix removal unit 60, an S / P conversion unit 61, a fast Fourier processing unit 62, and a P / S conversion unit 63.
  • the fast Fourier processing unit may be referred to as an “FFT processing unit”.
  • the cyclic prefix removing unit may be referred to as a “CP removing unit”.
  • the CP removal unit 60 removes the cyclic prefix inserted in the received signal.
  • the S / P converter 61 converts the serial data of each discrete-time symbol sampled by the analog-digital converter 52 into parallel data.
  • the FFT processing unit 62 converts the parallel data output from the S / P conversion unit 61 into a frequency domain signal.
  • the FFT processing unit 62 outputs parallel data having a bit width corresponding to the number of subcarriers.
  • the P / S conversion unit 63 converts the parallel data output from the FFT processing unit 62 into serial data, and outputs the serial data to the reference signal extraction unit 18 and the demodulation unit 20.
  • the reference signal extraction unit 18 extracts the reference signal that has been inserted into the reception signal for synchronous detection.
  • the channel estimation unit 19 estimates the fluctuation of the wireless transmission path based on the extracted reference signal.
  • the demodulator 20 demodulates the original signal by compensating for the fluctuation of the wireless transmission path estimated by the channel estimator 19.
  • the decoding unit 21 decodes the demodulated signal.
  • the signal processing unit 10 converts the signal format transmitted from the mobile station 3 through the wireless communication channel into a signal format to be transmitted to the wired network.
  • the degradation degree determination unit 22 determines whether or not to perform control for restricting the operation of the relay station 4 based on the relationship between the reception power value P1 of the direct signal and the reception power value P2 of the relay signal.
  • the degradation degree determination unit 22 measures the received power value P1 and the received power value P2 of the radio signal received from each mobile station for each mobile station, and the number of mobile stations with a small difference between P1 and P2 is determined. When the number increases, the operation of the relay station 4 is restricted.
  • FIG. 6 is a diagram illustrating a configuration example of the deterioration degree determination unit 22.
  • the degradation level determination unit 22 includes a delay profile measurement unit 70, a reception power measurement unit 71, a delay time setting unit 72, a first determination unit 73, a counting unit 74, a second determination unit 75, and the number of mobile stations.
  • a setting unit 76 and a control signal generation unit 77 are provided.
  • the delay profile measuring unit 70 measures the delay profile of the received signal received from each mobile station 3.
  • the received power measuring unit 71 directly receives the received power value P1 of the signal S1 and its relay signal S2 for each mobile station 3 in the service area, that is, for each mobile station 3 connected to the base station 2, based on the respective delay profiles.
  • the received power value P2 is measured.
  • the average value and standard deviation of the processing delay time T by the relay station 4 can be determined in advance based on the specifications of the relay station 4. For this reason, for example, the delay profile measurement unit 70 may set the peak of the received power value that occurs before and after the known delay time T has elapsed since the direct reception of the signal S1 as the received power value P2 of the relay signal S2.
  • the delay time setting unit 72 gives the value of the known delay time T to the received power measurement unit 71.
  • the first determination unit 73 determines, for each mobile station 3, whether or not the received power value P1 and the received power value P2 satisfy a predetermined first condition.
  • the first condition may be any condition as long as it evaluates the degree of approximation between the received power value P1 and the received power value P2.
  • the first condition may be a condition that is satisfied when the absolute value
  • the first condition may be a condition for determining the degree of approximation based on a ratio between the received power value P1 and the received power value P2 or a predetermined function.
  • the counting unit 74 determines the number of mobile stations 4 that satisfy the first condition.
  • the second determination unit 75 determines whether the number B of all mobile stations 4 in the service area and the number A of mobile stations 4 satisfying the first condition satisfy a predetermined second condition.
  • the predetermined second condition may be any condition as long as it can evaluate whether or not the number A of mobile stations 4 that satisfy the first condition exceeds the allowable range.
  • the ratio C (A / B) between the number B of all mobile stations 4 in the service area and the number A of mobile stations 4 satisfying the first condition is larger than a predetermined threshold ⁇ . It may be a condition that is sometimes satisfied.
  • the second condition is the size of the number A of mobile stations 4 satisfying the first condition based on the number B of all mobile stations 4 in the service area and the number A of mobile stations 4 satisfying the first condition. Any function that evaluates may be used.
  • 10% which is often used as an allowable value of the error rate, may be used as the threshold value ⁇ of the ratio of the number A expected to be greatly deteriorated to the total number B.
  • the mobile station 4 has a received power value P1 of the direct signal S1 smaller than the reference value so that the operation of the relay station 4 becomes difficult to control when there are relatively many mobile stations 4 having a small received power value P1 of the direct signal S1.
  • the threshold value ⁇ may be changed according to the number of.
  • the mobile station number setting unit 76 determines the number B of all the mobile stations 4 in the service area and supplies the determined number to the second determination unit 75.
  • the control signal generator 77 generates a relay station control signal that regulates the operation of the relay station 4 when the second condition is satisfied.
  • the first determination unit 73 of the degradation level determination unit 22 may calculate the cumulative value of the absolute values
  • the degradation degree determination unit 22 may determine whether or not to generate a relay station control signal based on the accumulated value.
  • the counting unit 74 and the second determination unit 75 may be omitted.
  • the deterioration degree determination unit 22 may generate a relay station control signal when the accumulated value of
  • the relay station control signal may be, for example, a relay operation stop signal that instructs to stop the relay operation by the relay station 4.
  • the relay station control signal may be a gain reduction signal that reduces the gain with which the relay station 4 amplifies the relay target signal.
  • the relay station control signal may be a directivity change signal that changes the directionality of the antenna of the relay station 4.
  • the relay station control signal may be a self-interference removal stop signal that causes the relay station 4 to stop the self-interference removal process.
  • the self-interference canceling process is a process in which the relay station 4 delays a signal having a phase opposite to that of the transmission signal and adds it to the reception signal, thereby removing interference of the transmission signal of the relay station 4 with respect to the reception signal of the relay station 4. It is processing to do.
  • the control signal generator 77 outputs the relay station control signal to the modulator 12.
  • the modulation part 12 modulates a subcarrier with a relay station control signal.
  • FIG. 7 is a configuration diagram illustrating a configuration example of the modulation unit 12.
  • the modulation unit 12 includes a subcarrier allocation unit 80, n subcarrier modulation units 81-1 to 81-n, and a P / S conversion unit 82.
  • the subcarrier allocation unit 80 allocates subcarriers to the downlink data and the relay station control signal according to the resource block allocation information received from the signal processing unit 10.
  • Subcarrier modulation sections 81-1 to 81-n modulate subcarriers by signals assigned to the respective subcarriers.
  • the P / S converter 82 converts n subcarriers modulated by the subcarrier modulators 81-1 to 81-n into serial signals.
  • the serial signal output from the P / S conversion unit 82 is input to the S / P conversion unit 30 of the IFFT unit 13.
  • the relay station control signal is multiplexed with the downlink signal and transmitted to the relay station 4.
  • the degradation degree determination unit 22, the modulation unit 12, the IFFT unit 13, and the wireless transmission unit 14 are examples of the transmission unit of the base station described in the claims.
  • FIG. 8 is a configuration diagram of a first example of the relay station 4.
  • the relay station 4 includes an antenna 100, a first DUP 101, a first receiving amplifier 102, a first self-interference canceling unit 103, a first hybrid 104, a second hybrid 105, a first phase adjusting unit 106, A two-phase adjustment unit 107 is provided.
  • the relay station 4 includes a first transmission amplifier 108, a second transmission amplifier 109, a second DUP 110, a third DUP 111, antennas 112 and 113, a second reception amplifier 120, and a third reception amplifier 121.
  • the relay station 4 includes a third phase adjustment unit 122, a fourth phase adjustment unit 123, a third hybrid 124, a second self-interference removal unit 125, a third transmission amplifier 126, and a control signal extraction unit 130.
  • the hybrid may be referred to as “HYB”.
  • the radio signal from the base station 3 is received by the antenna 100, passes through the first DUP 101, and is input to the first receiving amplifier 102.
  • the first reception amplifier 102 amplifies the reception signal.
  • the first self-interference removal unit 103 performs self-interference removal processing for removing the interference component of the downlink transmission signal from the relay station 4 from the reception signal.
  • the first HYB 104 divides the received signal. A part of the divided signal is input to the second HYB 105 and the other part is input to the second phase adjustment unit 107.
  • the second HYB 105 further divides the received reception signal. Second HYB 105 outputs a part of the divided signal to control signal extraction section 130. Second HYB 105 outputs the other part of the divided signal to first phase adjustment section 106.
  • the first phase adjusting unit 106 and the second phase adjusting unit 107 adjust the direction of directivity of the antennas 112 and 113 when transmitting the downlink signal by adjusting the phase of the input received signal, respectively.
  • the first transmission amplifier 108 and the second transmission amplifier 109 amplify the reception signals whose phases are adjusted by the first phase adjustment unit 106 and the second phase adjustment unit 107, respectively.
  • the signals amplified by the first phase adjustment unit 106 and the second phase adjustment unit 107 are transmitted from the relay station 4 via the second DUP 110 and the antenna 112, and the third DUP 111 and the antenna 113, respectively.
  • the radio signal from the mobile station 3 is received by the antennas 112 and 113, passes through the second DUP 110 and the third DUP 111, respectively, and is input to the second reception amplifier 120 and the third reception amplifier 121.
  • the second reception amplifier 120 and the third reception amplifier 121 each amplify the reception signal.
  • the third phase adjustment unit 122 and the fourth phase adjustment unit 123 receive the signals amplified by the second reception amplifier 120 and the third reception amplifier 121.
  • the third phase adjustment unit 122 and the fourth phase adjustment unit 123 adjust the phases of the signals amplified by the second reception amplifier 120 and the third reception amplifier 121, respectively, so that the antenna 112 when receiving the uplink signal is used. And the directionality of 113 is adjusted.
  • the output signals of the third phase adjustment unit 122 and the fourth phase adjustment unit 123 are combined by the third HYB and input to the second self-interference removal unit 125.
  • the second self-interference removing unit 125 performs a self-interference removing process for removing the interference component of the uplink transmission signal from the relay station 4 from the received signal.
  • the third transmission amplifier 126 amplifies the signal subjected to the self-interference removal process. The signal amplified by the third transmission amplifier 126 is transmitted from the relay station 4 via the first DUP 101 and the antenna 100.
  • the control signal extraction unit 130 extracts a relay station control signal by demodulating and decoding a part of the downlink signal separated by the second HYB 105.
  • the control signal extraction unit 130 regulates the operation of the relay station 4 according to the relay station control signal.
  • the control signal extraction unit 130 performs control to stop the relay operation by the relay station 4.
  • This control is, for example, control in which the control signal extraction unit 130 changes the gain setting biases of the first transmission amplifier 108, the second transmission amplifier 109, and the third transmission amplifier 126 so that the gains of these amplifiers become zero. It's okay.
  • the control signal extraction unit 130 may resume the relay operation by the relay station 4 after a predetermined time has elapsed.
  • the control signal extraction unit 130 changes the gain setting bias of the first transmission amplifier 108, the second transmission amplifier 109, and the third transmission amplifier 126, and these amplifiers. The gain may be reduced.
  • the control signal extraction unit 130 includes a first phase adjustment unit 106, a second phase adjustment unit 107, a third phase adjustment unit 122, and a fourth phase adjustment unit.
  • the direction adjustment direction of the antennas 112 and 113 may be changed by changing the phase adjustment amount of 123.
  • the relay station control signal is transmitted from the base station 2 when the number of mobile stations 3 having a relatively small difference between the received power values P1 and P2 exceeds the allowable range.
  • the number of mobile stations 3 having a relatively small difference between the received power values P1 and P2 exceeds the allowable range.
  • the control signal extraction unit 130 maintains the offset between the direction at the time of downlink transmission reception and the direction at the time of uplink signal transmission, while maintaining the offset.
  • the directivity of 112 and 113 may be changed.
  • the control signal extraction unit 130 stops the self-interference removal processing in the first self-interference removal unit 103 and the second self-interference removal unit 125. Good.
  • the control signal may be a signal obtained by combining any or all of the relay operation stop signal, the gain reduction signal, the directivity change signal, and the self-interference removal stop signal.
  • the control signal extraction unit 130 is an example of the control unit of the relay station described in the claims.
  • FIG. 9 is an explanatory diagram of a first example of processing of the base station 2.
  • the following operations AA to AF may be steps.
  • the delay profile measuring unit 70 of the base station 2 measures the delay profile of the mobile station 3 in the service area of the base station 2.
  • the delay profile measurement unit 70 determines whether or not the delay profiles have been measured for all the mobile stations 3 in the service area. When delay profiles have been measured for all mobile stations 3 (operation AB: Y), the processing moves to operation AC. When delay profiles have not been measured for all mobile stations 3 (operation AB: N), the processing returns to operation AA.
  • the first determination unit 73 determines, for each mobile station 3, whether or not the received power value P1 and the received power value P2 satisfy a predetermined first condition.
  • the counting unit 74 determines the number of mobile stations 4 that satisfy the first condition.
  • the second determination unit 75 determines whether the number B of all mobile stations 4 in the service area and the number A of mobile stations 4 satisfying the first condition satisfy a predetermined second condition.
  • operation AD: Y When the second condition is satisfied (operation AD: Y), the process proceeds to operation AE.
  • operation AD: N When the second condition is not satisfied (operation AD: N), the process proceeds to operation AF.
  • control signal generator 77 In operation AE, the control signal generator 77 generates a relay station control signal that regulates the operation of the relay station 4.
  • the base station 2 transmits a relay station control signal to the relay station 4.
  • operation AF the base station 2 determines whether or not to end the service.
  • operation AF: Y the process is terminated.
  • operation AF: N the processing returns to operation AA.
  • the base station 2 repeats operations AA to AF at a predetermined cycle.
  • the present embodiment it is possible to reduce the strength of the relay signal when the number of mobile stations in which the signal is deteriorated because the reception strength of the direct signal and the relay signal is close exceeds an arbitrarily set allowable range. become. As a result, it is possible to prevent the number of mobile stations whose signals deteriorate due to interference of relay signals from exceeding a certain allowable range.
  • FIG. 10 is an overall view of a second example of the wireless communication system 1.
  • a plurality of relay stations 4-1 to 4-3 are provided to relay a radio signal transmitted and received by one base station 2.
  • Reference numerals C1 to C3 indicate service areas of the relay stations 4-1 to 4-3, respectively.
  • mobile stations 3-1 and 3-2 exist in the service area C1 of the relay station 4-1, and mobile stations 3-3 and 3-4 exist in the service area C2 of the relay station 4-2.
  • the mobile stations 3-5 and 3-6 exist in the service area C3 of the relay station 4-3.
  • the relay stations 4-1 to 4-3 may be collectively referred to as “relay station 4”.
  • the mobile stations 3-1 to 3-6 may be collectively referred to as “mobile station 3”.
  • each relay station 4-1 to 4-3 has its own identifier.
  • Each relay station 4-1 to 4-3 multiplexes its own identifier on an uplink signal, that is, a radio signal from the mobile station 3 to the base station 2.
  • a resource block for storing the identifier of the relay station 4 may be prepared in advance, and the relay station 4 may store its own identifier in the resource block for storing the identifier when relaying the uplink signal. .
  • the base station 2 extracts the identifier of the relay station 4 multiplexed on the received radio signal.
  • the base station 2 classifies the mobile stations 3-1 to 3-6 according to the identifier of the relay station 4 that relays the radio signal transmitted by each. That is, the base station 2 classifies each mobile station 3 into a group of mobile stations 3 relayed by the same relay station 4.
  • the degradation degree determination unit 22 of the base station 2 executes the above-described determination process for each group, and determines whether it is necessary to transmit the relay station control signal to each relay station 4.
  • FIG. 11 is a block diagram of a second example of the relay station 4 shown in FIG. Components that are the same as those shown in FIG. 8 are given the same reference numerals, and components having the same reference numerals perform the same processing unless otherwise described.
  • the relay station 4 includes an identification signal generation unit 131 that generates an identification signal indicating the identifier of the relay station 4, and a fourth HYB 132 that multiplexes the identification signal into an uplink signal.
  • FIG. 12 is an explanatory diagram of a second example of the processing of the base station 2.
  • the following operations BA to BK may be steps.
  • the deterioration degree determination unit 22 extracts the identification signal of the relay station 4 stored in the radio signal received from the mobile station 3.
  • the degradation degree determination unit 22 classifies the mobile stations 3 for each identifier indicated by the identification signal, and creates a group of the mobile stations 3 relayed by the same relay station 4.
  • the delay profile measuring unit 70 measures the delay profile of the mobile station 3 in the service area of the base station 2.
  • the delay profile measurement unit 70 determines whether or not the delay profiles have been measured for all the mobile stations 3 in the service area. When delay profiles have been measured for all mobile stations 3 (operation BD: Y), the processing moves to operation BE. When delay profiles have not been measured for all mobile stations 3 (operation BD: N), the processing returns to operation BC.
  • the following operations BF to BJ are executed for each group of mobile stations 4.
  • the mobile station 4 is classified into m groups.
  • the deterioration degree determination unit 22 initializes the value of the variable i to “1”.
  • the variable i is an index variable that designates each group of the mobile station 4.
  • the first determination unit 73 determines whether the received power value P1 and the received power value P2 satisfy the predetermined first condition for each mobile station 3 for the group i.
  • the counting unit 74 determines the number of mobile stations 4 that satisfy the first condition in the group i.
  • the second determination unit 75 determines whether the number B of all mobile stations 4 in group i and the number A of mobile stations 4 satisfying the first condition satisfy a predetermined second condition. When the second condition is satisfied (operation BG: Y), the process proceeds to operation BH. When the second condition is not satisfied (operation BG: N), the process proceeds to operation BI.
  • control signal generation unit 77 In operation BH, the control signal generation unit 77 generates a relay station control signal that regulates the operation of the relay station 4 that relays the signal from the mobile station 3 in group i.
  • the base station 2 transmits a relay station control signal to the relay station 4.
  • the deterioration degree determination unit 22 increases the value of the variable i by “1”. In operation BJ, the deterioration degree determination unit 22 determines whether or not the value of the variable i exceeds the number of groups “m”. When variable i> m (operation BJ: Y), the process proceeds to operation BK. When the variable i ⁇ m (operation BJ: N), the process returns to operation BF.
  • operation BK the base station 2 determines whether or not to end the service.
  • operation BK: Y the process is terminated.
  • operation BK: N the processing returns to operation BA.
  • the base station 2 repeats operations BA to BK at a predetermined cycle.
  • the operation can be regulated for each relay station.
  • the base station 2 regulates the operation of the relay station 4 based on the relationship between the power value of the downlink direct signal and the power value of the relay signal measured by the mobile station 3.
  • FIG. 13 is a diagram illustrating a configuration example of the mobile station 3 used in the wireless communication system 1 of this configuration example.
  • the mobile station 3 includes a signal processing unit 210, an encoding unit 211, a modulation unit 212, an IFFT unit 213, a wireless transmission unit 214, and an antenna 215.
  • the mobile station 2 includes a radio reception unit 216, an FFT unit 217, a reference signal extraction unit 218, a channel estimation unit 219, a demodulation unit 220, and a decoding unit 221.
  • the operations of these components 211 to 221 are the same as the operations of the components 11 to 21 of the base station 2 except that the signals handled are either uplink signals or downlink signals.
  • the mobile station 3 includes an index value calculation unit 222, a human interface unit 223, an audio signal input / output unit 224, a display unit 225, and an operation unit 226.
  • the index value calculation unit 222 calculates an index value indicating the relationship between the first power value P1 of the downlink direct signal measured by the mobile station 3 and the second power value P2 of the relay signal.
  • FIG. 14 is a diagram illustrating a configuration example of the index value calculation unit 222.
  • the index value calculation unit 222 includes a delay profile measurement unit 230, a received power measurement unit 231, a delay time setting unit 232, a calculation unit 233, and an index value information generation unit 234.
  • the delay profile measurement unit 230 measures the delay profile of the received signal received by the mobile station 3.
  • the received power measuring unit 231 measures the received power value P1 of the direct signal S1 and the received power value P2 of the relay signal S2 based on the delay profile.
  • the delay time setting unit 232 gives the value of the known delay time T to the received power measurement unit 231.
  • the calculation unit 233 calculates an index value indicating the relationship between the received power value P1 and the received power value P2.
  • the index value may be an index value used for the determination of the first condition described above.
  • the index value may be a value indicating the degree of approximation between the received power value P1 and the received power value P2, for example.
  • the index value may be, for example, the absolute value
  • the index value may be the received power value P1 and the received power value P2 itself. At this time, the calculation unit 233 may be omitted.
  • the index value information generation unit 234 generates index value information indicating the index value and outputs it to the modulation unit 212.
  • Modulation section 212 modulates the subcarrier with the index value information in addition to the uplink data input from encoding section 11.
  • the modulation unit 212 may have a configuration similar to the configuration illustrated in FIG.
  • the human interface unit 223 is an interface between the audio signal input / output unit 224, the display unit 225, the operation unit 226, and the signal processing unit 210.
  • the audio signal input / output unit 224 outputs an audio signal provided to the user by the mobile station 3 and accepts an audio signal input from the user.
  • the audio signal input / output unit 224 may be a speaker or a microphone.
  • the display unit 225 displays a visual signal provided to the user by the mobile station 3.
  • the display unit 225 may be a display device such as a liquid crystal display, a plasma display, or an organic electroluminescence display.
  • the operation unit 226 accepts an operation input by contact from a user.
  • the operation unit 226 may be a keyboard or a touch panel, for example.
  • the index value calculation unit 222, the modulation unit 212, the IFFT unit 213, and the wireless transmission unit 214 are examples of the transmission unit of the mobile station described in the claims.
  • FIG. 15 is a diagram illustrating a configuration example of the base station 2 used in the wireless communication system 1 of this configuration example.
  • the same components as those shown in FIG. 2 are denoted by the same reference numerals, and the components having the same reference numerals perform the same processing unless otherwise described.
  • the first determination unit 73 of the degradation level determination unit 22 determines whether the received power value P1 and the received power value P2 satisfy the first condition based on the index value included in the radio signal received from the mobile station 3. judge. For this reason, in this embodiment, the delay profile measuring unit 70, the received power measuring unit 71, and the delay time measuring unit 72 may be omitted. Further, the first determination unit 73 may calculate a cumulative value of absolute values
  • the operation of the relay station can be regulated based on the received power of the downlink signal. Therefore, according to the present embodiment, when the relationship between the reception power of the direct signal and the relay signal is different between the uplink and the downlink, the operation of the relay station 4 is regulated by focusing on the reception quality of the downlink. Is possible.
  • the relay station 4 that has received the relay station control signal may regulate only the downlink relay operation.
  • the base station 2 is based on the relationship between the power value of the downlink direct signal and the power value of the relay signal according to this configuration example.
  • the operation of the relay station 4 may be restricted.
  • the relay station 4 may multiplex its own identification signal with the downlink signal.
  • the mobile station 3 may extract the identification signal included in the received downlink signal and store it in the uplink signal.
  • the base station 2 may classify the mobile stations 3 based on the identification signal included in the uplink signal.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Relay Systems (AREA)

Abstract

L'invention porte sur un procédé de communication sans fil utilisé dans un système de communication sans fil (1) comprenant une station relais (4) pour relayer un signal sans fil envoyé par une station mobile (3) à une station de base (2). La station mobile (3) envoie le signal sans fil à la station de base (2), la station relais (4) reçoit le signal sans fil envoyé par la station mobile (3) à la station de base (2) et envoie ce signal sans fil à la station de base (2), et la station de base (2) reçoit, directement de la station mobile (3) et/ou par l'intermédiaire de la station relais (4), le signal sans fil envoyé par la station mobile (3). Sur la base de la relation entre la puissance de réception lorsque le signal sans fil a été reçu à un certain instant et la puissance de réception lorsque le signal sans fil a été reçu après un retard spécifié par rapport à cet instant, la station de base (2) envoie, à la station relais, un signal de commande pour commander le fonctionnement de la station relais (4).
PCT/JP2010/066086 2010-09-16 2010-09-16 Procédé de communication sans fil, station relais, station de base et station mobile WO2012035638A1 (fr)

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PCT/JP2010/066086 WO2012035638A1 (fr) 2010-09-16 2010-09-16 Procédé de communication sans fil, station relais, station de base et station mobile

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PCT/JP2010/066086 WO2012035638A1 (fr) 2010-09-16 2010-09-16 Procédé de communication sans fil, station relais, station de base et station mobile

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023204186A1 (fr) * 2022-04-22 2023-10-26 三菱電機株式会社 Système de communication

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009177628A (ja) * 2008-01-25 2009-08-06 Ntt Docomo Inc リレー伝送システム、基地局、中継局及び方法
JP2010103638A (ja) * 2008-10-21 2010-05-06 Fujitsu Ltd 通信装置、通信システムおよび通信方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009177628A (ja) * 2008-01-25 2009-08-06 Ntt Docomo Inc リレー伝送システム、基地局、中継局及び方法
JP2010103638A (ja) * 2008-10-21 2010-05-06 Fujitsu Ltd 通信装置、通信システムおよび通信方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023204186A1 (fr) * 2022-04-22 2023-10-26 三菱電機株式会社 Système de communication

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