WO2006112133A1 - Transmetteur et systeme de communication sans fil - Google Patents

Transmetteur et systeme de communication sans fil Download PDF

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Publication number
WO2006112133A1
WO2006112133A1 PCT/JP2006/303051 JP2006303051W WO2006112133A1 WO 2006112133 A1 WO2006112133 A1 WO 2006112133A1 JP 2006303051 W JP2006303051 W JP 2006303051W WO 2006112133 A1 WO2006112133 A1 WO 2006112133A1
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WIPO (PCT)
Prior art keywords
propagation path
subcarrier
value
path information
sir
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PCT/JP2006/303051
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English (en)
Japanese (ja)
Inventor
Yasuyuki Kato
Original Assignee
Sharp Kabushiki Kaisha
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Publication date
Application filed by Sharp Kabushiki Kaisha filed Critical Sharp Kabushiki Kaisha
Priority to JP2007521100A priority Critical patent/JP4960230B2/ja
Publication of WO2006112133A1 publication Critical patent/WO2006112133A1/fr

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Classifications

    • 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
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal

Definitions

  • the present invention relates to a radio transmitter that performs high-speed communication by adaptively changing a modulation scheme, a coding rate, and the like for each subcarrier based on a radio channel state on the receiver side, and a radio including the radio transmitter
  • the present invention relates to a communication system.
  • base station a radio base station
  • mobile station a radio mobile station
  • MCS Modulation and Code Scheme
  • the base station transmits a signal with constant transmission power for each subcarrier to the mobile station.
  • the signal transmitted from the base station in this way is attenuated for each subcarrier due to the influence of frequency fading as shown in FIG.
  • the mobile station calculates the received SIR of all subcarriers from the known signal (pilot signal) included in the frame, digitizes the calculated received SIR information of all subcarriers, and periodically transmits it to the base station side.
  • the base station receives the received signal from the mobile station. From the received SIR information, for example, the modulation scheme and coding rate are determined for each subcarrier based on the threshold set as shown in FIG. 23, and the data is transmitted to the mobile station!
  • Non-Patent Document 1 Kazunari Yokomakura, Seiichi Sampei, Norihiko Morinaga, “Study on interference power estimation and notification technology in 1-cell repeated OFDMZTDMA system using adaptive modulation”, IEICE Technical Report RCS2003 — 240 p. 33— 38, 2003 Invention Disclosure
  • the reception SIR of the reception SIR depends on the number of subcarriers. There is a problem that the amount of information increases.
  • many of the adaptive modulation communication systems that are considered use hundreds of subcarriers, and several kilobits are required to transmit the corresponding number of received SIRs.
  • the amount of radio propagation information is required.
  • the adaptive modulation scheme periodically changes the modulation scheme, the mobile station must periodically notify the base station of the propagation path information in accordance with the base station cycle. For this reason, in the uplink, the usage rate of the amount of channel information is large, and the transmission efficiency is poor.
  • it is assumed that the transmission rate of the uplink to the mobile station and the transmission rate of the uplink to the base station is lower than that of the downlink to the mobile station. As a result, transmission efficiency is further deteriorated.
  • Non-Patent Document 1 there are subcarriers with good radio conditions and bad subcarriers within the blocked subcarrier group. Therefore, when these are averaged, as shown in FIG. 25, a modulation scheme having a high modulation degree is not selected for subcarriers with good radio conditions, and transmission efficiency deteriorates, or conversely, The problem is that a modulation scheme with a high degree of modulation is selected for a bad subcarrier and the number of errors increases, and the optimum modulation scheme is not selected for the subcarrier, resulting in a decrease in transmission efficiency.
  • the present invention has been made in view of such conventional problems, and improves transmission efficiency on a link that notifies channel information while suppressing the occurrence of errors during communication.
  • An object of the present invention is to provide a wireless transmitter capable of performing the above and a wireless communication system including the same. Means for solving the problem
  • a wireless transmitter includes a propagation path state estimation unit that estimates a propagation path state from a radio signal received from a communication partner, and a specific subcarrier according to an estimation result by the propagation path state estimation unit.
  • a propagation path information creation unit that creates propagation path information obtained by decimating a value indicating the propagation path status, and a transmission processing unit that transmits the propagation path information created by the propagation path information creation unit to a communication partner. It is characterized by.
  • the propagation path information creation unit creates propagation path information by thinning out the value indicating the propagation path condition of a specific subcarrier, the value indicating the propagation path condition of all subcarriers is notified. Compared with the case where the transmission is performed, it is possible to improve the transmission efficiency on the link for notifying the propagation path information.
  • the propagation path information creation unit is adjacent to the value indicating the propagation path condition for the subcarriers selected for each predetermined number and the selected neighbor. Produce force propagation path information only from the value obtained by linear interpolation from the value indicating the propagation path condition for the subcarrier and the subcarrier number having the value indicating the propagation path condition with the largest error and the value indicating the propagation path condition. It is characterized by.
  • the value indicating the propagation path condition for the subcarriers selected for each predetermined number and the value linearly interpolated from the value indicating the propagation path condition for the selected adjacent subcarriers are the most error. Since the propagation path information is created only from the subcarrier number having a value indicating a large propagation path condition and the value indicating the propagation path condition, the value indicating the propagation path condition of all the subcarriers is notified. Compared to this, it is possible to improve the transmission efficiency on the link that notifies the propagation path information. Also, since the subcarrier number with the largest error and the value indicating the propagation path status are notified, the communication scheme can correct the coding rate, for example, based on such information. This is not compatible with radio conditions Since it is possible to avoid a situation where communication errors increase due to the selection of a modulation method, etc., it is possible to suppress the occurrence of errors during communication.
  • the propagation path information creation unit has a slope of a curve obtained by connecting a value indicating a propagation path condition for each subcarrier in advance. It is characterized in that the propagation path information is created only from the subcarrier number and the value indicating the propagation path status when it changes by more than a fixed value.
  • the propagation path information creation unit includes a sign of a slope of a curve obtained by connecting a value indicating a propagation path condition for each subcarrier. It is characterized in that force propagation path information is created only with a subcarrier number and a value indicating the propagation path state when the value changes.
  • the propagation path information creation unit includes a sign of a slope of a curve obtained by connecting a value indicating a propagation path condition for each subcarrier. Propagation is based only on the value indicating the subcarrier number and the propagation path condition when the signal changes, and the value indicating the propagation path condition for the subcarrier arranged in the middle between the subcarrier numbers where the sign of the curve changes. It is characterized by creating road information.
  • the modulation method ' The coding rate can be modified. As a result, it is possible to select a modulation method or the like that is more suitable for the wireless state, and it is possible to further suppress the occurrence of errors during communication.
  • the propagation path information creation unit is a sign of a slope of a curve obtained by connecting a value indicating a propagation path condition for each subcarrier. Only when the subcarrier number has a value indicating the propagation path condition between the subcarrier number and the propagation path condition when the value of the curve changes, and the intermediate propagation path condition between the subcarrier numbers where the sign of the slope of the curve has changed. It is characterized by creating information.
  • a curve obtained by connecting values indicating propagation path conditions for each subcarrier. Only a subcarrier number having a value indicating a subcarrier number and a propagation path condition when the sign of the slope of the curve changes, and a value indicating an intermediate propagation path condition between subcarrier numbers where the sign of the slope of the curve is changed Since the propagation path information is created, the amount of wireless propagation path information can be significantly reduced compared to the case where the values indicating the propagation path conditions of all subcarriers are notified, and the link that notifies the propagation path information. The above transmission efficiency can be improved.
  • the subcarrier number and the value indicating the propagation path condition when the slope in the above curve is reversed are notified, the value indicating the actual propagation path condition and the value indicating the propagation path condition significantly deviated are notified. Can be prevented. As a result, it is possible to avoid a situation in which a modulation scheme or the like that does not conform to the radio state is selected and communication errors increase, and thus it is possible to suppress the occurrence of errors during communication. Further, since the subcarrier number having a value indicating the intermediate channel condition between the values indicating the channel condition of the subcarrier number whose slope in the above curve is reversed is notified, the communication is performed based on the information. At the other end, for example, the modulation scheme 'coding rate can be modified. As a result, it is possible to select a modulation method or the like that is more suitable for the radio state, and it is possible to further suppress the occurrence of errors during communication.
  • the propagation path information creation unit selects the method with the smallest data amount of the propagation path information and selects the propagation path information. It is characterized by creating.
  • the propagation path information creation unit creates the propagation path information by selecting the method with the smallest data amount of the propagation path information, so that the transmission efficiency can be improved most. It is possible to notify the communication partner of the propagation path information by selecting a method.
  • the propagation path state estimation unit uses a received SIR (Signal to Interference Power Ratio) as a propagation path state. It is characterized by estimation.
  • the propagation path condition estimation unit uses a received SNR (Signal to Noise Power Ratio) as a propagation path condition. It is characterized by estimating.
  • the propagation path condition estimation unit may Received as SINR (Signal to Interference Plus Noise Power Ratio
  • the propagation path condition estimation unit estimates the reception SIR, the reception SNR, and the reception SINR as the propagation path condition, so that the propagation path condition can be estimated appropriately.
  • the mobile station apparatus is characterized by including the radio transmitter according to any one of claims 1 to 10.
  • the mobile station apparatus since the mobile station apparatus includes the above-described radio transmitter, the mobile station apparatus is on the link that notifies the channel information compared to the case where the values indicating the channel conditions of all the subcarriers are notified.
  • the transmission efficiency can be improved, and the effects obtained by the radio transmitter according to each claim can be obtained also by the mobile station apparatus.
  • a base station apparatus is characterized by including the radio transmitter according to any one of claims 1 to 10.
  • the base station apparatus since the base station apparatus includes the above-described wireless transmitter, it is on the link that notifies the propagation path information compared to the case where the values indicating the propagation path conditions of all subcarriers are notified.
  • the transmission efficiency can be improved, and the effects obtained by the radio transmitter according to each claim can also be obtained by the base station apparatus.
  • a radio communication system uses the mobile station device according to any one of claims 8 to 10 and the propagation path information received from the mobile station device to And a base station apparatus that determines a modulation scheme and a code rate for each carrier.
  • the wireless communication system includes the mobile station apparatus according to any one of claims 8 to 10, the wireless communication system includes values indicating propagation path conditions of all subcarriers. Compared with the case of notification, it is possible to improve the transmission efficiency on the link for notifying the propagation path information.
  • FIG. 1 is a block diagram showing a configuration of a base station apparatus (hereinafter referred to as “base station”) 100 constituting the radio communication system according to the embodiment of the present invention.
  • FIG. 2 is a block diagram showing a configuration of mobile station apparatus (hereinafter referred to as “mobile station”) 200 constituting the communication system according to the embodiment of the present invention.
  • coding section 101 uses a coding scheme such as turbo coding for transmission data generated by an external device, and instructs it from an MCS allocation section described later. Data is encoded at the encoded rate.
  • the data modulation unit 102 performs modulation processing on the code data from the encoding unit 101 according to a modulation scheme instructed by the MCS allocation unit described later.
  • a serial Z parallel conversion unit (SZP conversion unit) 103 performs serial Z parallel conversion on the modulation data from the data modulation unit 102 and converts it into modulated data that has been processed in parallel according to the number of subcarriers.
  • Multiplexing section (Mux section) 104 is a pilot signal for mobile station 200 to estimate the received SIR of the modulated data converted in parallel to the number of subcarriers, and each sub-line from MLI generating section 111 described later. It is multiplexed with modulation / code information (MLI: Multi-vel information) that describes the carrier modulation method and code rate.
  • MLI modulation / code information
  • a pilot signal used for multiplexing is delivered from the pilot generation unit 105 at a predetermined timing.
  • the inverse fast Fourier transform unit (IFFT unit) 106 performs inverse Fourier transform on the multiplexed data from the Mux unit 104 and converts it into an OFDM signal.
  • Radio transmitting section 107 up-converts the OFDM signal to the radio frequency band, and transmits the sub-carrier to the mobile station with a constant transmission power.
  • Uplink reception processing section 108 receives data from mobile station 200, and separates the received data from received SIR information estimated by the mobile station. The received data is sent to the external device, and the received SIR information is sent to the SIR information extraction unit 109. Note that the reception form of the demodulation unit in base station 100 is not necessarily provided with the capability of adaptive modulation reception.
  • SIR information extraction section 109 extracts decimation information including the subcarrier number and SIR value transmitted from mobile station 200. Put out.
  • the thinned information power also calculates the SIR value of the subcarrier thinned out on the mobile station 200 side by linearly interpolating between specific received SIR values. Further, the reception SIR values of all subcarriers are sent to MCS allocation section 110.
  • MCS allocating section 110 determines MCS of each subcarrier from the calculated SIR value of each subcarrier, and provides code rate and code modulation ratio to code key section 101 and data modulation section 102, respectively. Indicates the modulation method. Also, the MCS information in each subcarrier this time is passed to the MLI generation unit 111. The MLI generation unit 111 assembles MCS information of each subcarrier, performs modulation and encoding at a modulation scheme and coding rate that the mobile station 200 can receive in any environment, and passes the generated MLI to the Mux unit 104 .
  • the modulation scheme and code rate performed by MLI generating section 111 are determined in advance between base station 100 and mobile station 200, and the scheme and the like are fixed.
  • MLI since MLI must be able to be received by mobile station 200 under any circumstances, it is desirable that the number of modulation multi-values is as low as possible (such as BPSK and QPSK) and that the code rate is low.
  • radio reception section 201 receives the radio signal from base station 100 and down-converts the radio signal in the radio frequency band to the IF frequency band.
  • a fast Fourier transform unit (FFT unit) 202 performs Fourier transform and returns the OFDM signal to modulation data.
  • the DeMux unit 203 separates the multiplexed modulation data, and sends the modulation data to the parallel Z-serial conversion unit (PZS conversion unit) 204, the MLI to the MLI extraction unit 206, and the pilot signal to the SIR estimation unit 207.
  • PZS conversion unit parallel Z-serial conversion unit
  • a parallel Z-serial conversion unit (PZS conversion unit) 204 performs parallel Z-serial conversion on the modulated data processed in parallel to the number of subcarriers, returns the modulated data to one column, and sends the data to the data demodulation unit 205.
  • the data demodulating unit 205 demodulates the modulated data by the demodulation method instructed according to the instruction of the MCS control unit 209, which will be described later, and returns it to the encoded data.
  • Decoding section 208 decodes the encoded data by a method instructed in accordance with an instruction from MCS control section 209 described later, and restores the original data.
  • the MLI extraction unit 206 performs demodulation and decoding processing for returning the modulation and coding scheme performed on the MLI in the base station 100, and sends the MLI data to the MCS control unit 209.
  • the MCS control unit 209 determines the MCS of each subcarrier from the MLI data, and the data demodulation unit 205 And the decoding key unit 208 is controlled.
  • SIR estimation section 207 also estimates the received SIR of each subcarrier in terms of pilot signal power. At this time, the estimated received SIR is the SIR smoothed between the subcarriers.
  • the SIR information creation unit 210 creates SIR information to be sent to the base station 100 from the received SIR value in each subcarrier from the SIR estimation unit 207 by using the below-described I-bow algorithm, and the uplink transmission processing unit Pass to 211. Uplink transmission processing section 211 multiplexes this SIR information and transmission data, and transmits them to base station 100 as radio signals.
  • the adaptive modulation control may not be particularly used.
  • the received SIR value of a specific subcarrier is thinned out. This reduces the amount of information and avoids a decrease in transmission efficiency and an increase in errors during communication that can occur by not reporting the received SIR values of all subcarriers.
  • decimation algorithm an algorithm used when thinning the received SIR value in a specific subcarrier will be described.
  • the thinning algorithm described above is used when the SIR information creation unit 210 in the mobile station 200 creates SIR information to be transmitted to the base station 100.
  • the SIR information creation unit 210 can use the following thinning algorithm alone or can be switched depending on the situation such as an error in the radio propagation path.
  • the first to fifth decimation algorithms used in the SIR information creation unit 210 will be described.
  • the first decimation algorithm calculates the subcarrier number and received SIR value with the largest error from the actual received SIR value from the value indicated by the straight line connecting the received SIR value and the received SIR value of every m subcarriers. It is something to detect. By notifying base station 100 only of the received SIR values of the detected subcarrier number subcarriers and every m subcarriers, the received SIR values of other subcarriers are thinned out as a result.
  • FIG. 3 is a diagram for explaining the outline of the first thinning algorithm.
  • FIG. 4 is a flowchart for explaining the first thinning algorithm.
  • Figure 5 FIG. 3 is a diagram showing an example of a frame format used for notifying a base station 100 of a reception SIR value of a subcarrier specified by using a thinning algorithm of 1.
  • the frame format used for notification to base station 100 describes the reception SIR value of each of m subcarriers, and the subcarrier number and reception SIR value that are the maximum error between m. .
  • the subcarrier number with the largest error from the actual received SIR value and the received SIR value are the fifth subcarrier number and The received SIR value will be notified.
  • step SI the received SIR value of the first subcarrier is converted into a frame format. Add (step S2).
  • Step S3 it is determined whether (m * (i + 1) +1) exceeds the total number of subcarriers n (step S3), and if it is lower, the reference number i is incremented (step S4). , Step S2 to Step S4 are repeated.
  • the SIR value of the (m + 1) th subcarrier is added to the frame format when the reference number i indicates “1”, and the (2m + 1) th when the reference number i indicates “2”.
  • SIR values of subcarriers are added to the format.
  • SIR values for every m subcarriers are added to the format up to the nth subcarrier.
  • the error g is calculated using the received SIR value of the carrier and the received SIR value of the (m * i + j + 1) th subcarrier (step S8).
  • the received SIR value of the first subcarrier is interpolated with the received SIR value of the second subcarrier.
  • this error g is substituted as the maximum error h.
  • step S12 By repeating the processing from step S7 to step S12, the error g of the third subcarrier is calculated, and then the error g is compared with the maximum error h. If the error g is larger than the maximum error h, the error g is registered as the maximum error h. If the error g is smaller than the maximum error h, the error g of the fourth subcarrier is calculated and similarly Compare with error h. The above processing is repeated until the m-th subcarrier, and the subcarrier number and SIR value with the maximum error h between the first subcarrier and the (m + 1) th subcarrier are detected.
  • step S7 the process returns to step S7, and the process of steps S7 to S12 is repeated with the reference number i incremented.
  • the subcarrier number and the received SIR value that are the maximum error h between the (m + 1) th subcarrier and the (2m + 1) th subcarrier are detected.
  • the above processing is repeated until the n-th subcarrier, and the subcarrier number and the received SIR value with the maximum error h in each section are detected and described in the frame format shown in FIG.
  • the base station 100 when the first thinning algorithm is used, sub-units for each predetermined number (m) are used.
  • the subcarrier number having the largest error from the received SIR value of the carrier and the actual received SIR value and the received SIR value are detected and reported to the base station 100 as radio propagation path information. For this reason, the transmission efficiency on the link for notifying the propagation path information can be improved as compared with the case of notifying the reception SIR values of all subcarriers.
  • the base station 100 since the subcarrier number having the largest error with the actual received SIR value and the received SIR value are notified, the base station 100 must correct the modulation scheme code rate based on such information. Can do. As a result, it is possible to avoid a situation in which a modulation scheme or the like that does not conform to the radio state is selected and a communication error increases, and it is possible to suppress the occurrence of an error during communication.
  • the second decimation algorithm detects the subcarrier number and the received SIR value when the slope of the curve obtained by connecting the received SIR values (hereinafter referred to as the “received SIR curve”) changes by more than a certain value. To do. By notifying base station 100 of only the subcarrier of the detected subcarrier number and its received SIR value, the received SIR values of other subcarriers are thinned out as a result.
  • FIG. 6 is a diagram for explaining the outline of the second thinning algorithm.
  • FIG. 7 is a flowchart for explaining the second thinning algorithm.
  • FIG. 8 is a diagram showing an example of a frame format used for notifying the base station 100 of the reception SIR value of the subcarrier specified by using the second algorithm.
  • step S28 a slope B between the reception SIR value of the t-th subcarrier and the reception SIR value of the (t + j) -th subcarrier is calculated (step S29). Further, a slope C between the received SIR value of the (t + j ⁇ 1) th subcarrier and the received SIR value of the (t + j) th subcarrier is calculated (step S30). Then, it is determined whether one of the calculated slope B and slope C is a value other than the value between the threshold value Pmin and the threshold value Pmax (step S31).
  • slope B and slope C are values between threshold Pmin and threshold Pmax, it is determined that there is no significant change in the received SIR value curve, and the process returns to step S27, and then step S Repeat steps 27 to S31.
  • slope B or slope C is a value other than the value between threshold P min and threshold Pmax, it is determined that there is a large change in the received SIR curve, and subcarrier number t is set to (t After substituting + j-1) (step S32), the process returns to step S22. Then, the processing from step S22 to step S32 is repeated.
  • step S34 the subcarrier number (t + j) -th sub Carrier number and its received SIR value in frame format Carry out additional charge (step S33) and end the second thinning algorithm.
  • step S22 the first subcarrier number and its received SIR value are added to the frame format.
  • step S25 after calculating the slope A between the reception SIR value of the first subcarrier and the reception SIR value of the second subcarrier, in step S26, a threshold value corresponding to the slope A (lower threshold Pmin, Search for the upper threshold (Pmax).
  • step S29 after calculating the slope B between the reception SIR value of the first subcarrier and the reception SIR value of the third subcarrier, the reception of the second subcarrier is performed in step S30.
  • the slope C between the SIR value and the received SIR value of the third subcarrier is calculated.
  • the change point of the slope is determined by determining whether one of the slopes B and C is a value other than the value between the lower limit threshold value Pmin and the upper limit threshold value Pmax. That is, if either of the slopes B and C is a value other than the value between the lower threshold Pmin and the upper threshold Pmax, the slope change point is determined as the previous subcarrier, and the second subcarrier number and its Add the received SIR value to the format.
  • the subcarrier number and the received SIR value when the slope of the received SIR curve changes by a certain value or more are detected and described in the frame format shown in FIG. .
  • the subcarrier number and the received SIR value when the slope of the received SIR curve changes by a certain value or more are detected, and the base station is used as radio propagation path information. Notify station 100. For this reason, it is possible to significantly reduce the amount of radio propagation path information compared to notifying the reception SIR values of all subcarriers, and to improve the transmission efficiency on the link that notifies the propagation path information. . Also, since the subcarrier number and the received SIR value when the slope of the received SIR curve changes by a certain value or more are reported, it is possible to prevent the received SIR value from being significantly different from the actual received SIR value. be able to. As a result, it is possible to avoid a situation in which a modulation scheme or the like that does not conform to the wireless state is selected and communication errors increase, and it is possible to suppress the occurrence of errors during communication.
  • the third decimation algorithm detects the subcarrier number and its received SIR value when the slope in the received SIR curve is reversed (decrease from increased calorie or increase in decremental power). This detected subcarrier number By notifying base station 100 of only the number and its received SIR value, the other subcarrier number and its received SIR value are thinned out as a result.
  • FIG. 10 is a diagram for explaining the outline of the third thinning algorithm.
  • FIG. 11 is a flowchart for explaining the third thinning algorithm.
  • FIG. 12 is a diagram showing an example of a frame format used for notifying the base station 100 of the reception SIR value of the subcarrier specified by using the third thinning algorithm V.
  • the reception SIR value between adjacent subcarriers is compared, and the subcarrier number and reception when the slope in the reception SIR curve is reversed. Extract SIR values.
  • step S44 determines whether the reception SIR value of the t-th subcarrier and the reception SIR value of the (t + j) -th subcarrier is calculated.
  • step S46 it is again determined whether the number of subcarriers indicated by (t + j) is the same as the total number n of subcarriers (step S47). If they are the same, the process proceeds to step S52, and the subcarrier number (t + j) -th subcarrier number and its received SIR value are added to the frame format.
  • step S47 the difference 13 between the reception SIR value of the t-th subcarrier and the reception SIR value of the (t + j) -th subcarrier is calculated (step S48). Then, it is determined whether the difference a is 0 or more and a is larger than
  • 8, or whether the difference a is less than 0 and a is smaller than ⁇ (step S49). If the deviation does not apply, it is determined that there is no reversal of the slope in the received SIR curve, and after substituting the difference j8 for the difference a (a ⁇ ) (step S50), the process returns to step S46. Then, the processing from step S46 to step S50 is repeated.
  • step S51 it is determined that there is an inversion of the slope in the received SIR curve, and (t + j-1) is substituted for subcarrier number t (step S51), and then the process goes to step S42. Return. Then, the processing from step S42 to step S51 is repeated. Then, while repeating the processing of step S42 to step S51, if it is determined in step S44 or step S47 that it is the same as the total number of subcarriers n, the subcarrier number (t + j) th subcarrier number The received SIR value is added to the frame format (step S52), and the third decimation algorithm is terminated.
  • step S42 the first subcarrier number and its received SIR value are added to the frame format.
  • step S45 a difference a between the reception SIR value of the first subcarrier and the reception SIR value of the second subcarrier is calculated.
  • step S48 a difference j8 between the reception SIR value of the first subcarrier and the reception SIR value of the third subcarrier is calculated.
  • step S49 the difference (difference between X and difference ⁇ or the difference between difference a and difference ⁇ 8 when X is less than 0 is determined when difference a is 0 or more.
  • a change point at which the slope in the received SIR curve reverses (hereinafter referred to as “reverse change point”) is determined, that is, when the difference a is 0 or more, the difference oc is greater than the difference ⁇ .
  • the second subcarrier is determined to be the reverse change point, while the difference (if the difference a is smaller than the difference ⁇ when X is less than 0, the second subcarrier is The carrier is determined to be the reverse change point, and the second subcarrier number and its received SIR value are added to the format.By performing such processing up to the nth subcarrier, the slope in the received SIR curve is reversed. Subcarrier number and receipt The detected SIR value is detected and described in the frame format shown in Fig. 12.
  • the slope in the received SIR curve is The subcarrier number and the received SIR value are detected and the base station 100 is notified as radio propagation path information. For this reason, the amount of radio propagation path information can be greatly reduced compared to the case of notifying the reception SIR values of all subcarriers, and the transmission efficiency on the link for notifying the propagation path information can be improved. .
  • the subcarrier number and the received SIR value when the slope in the received SIR curve is reversed are reported, it is possible to prevent the received SIR value from being significantly different from the actual received SIR value. it can. As a result, it is possible to avoid a situation in which a modulation scheme or the like that does not conform to the radio state is selected and communication errors increase, and it is possible to suppress the occurrence of errors during communication.
  • the fourth decimation algorithm detects the subcarrier number and its received SIR value when the slope in the received SIR curve is reversed (decreased from increased calorie or increased decremental power), and between the subcarrier numbers whose slope is reversed. This is to detect the reception SIR value of the subcarriers arranged in the middle of. By notifying base station 100 of only the detected subcarrier number and its received SIR value, other subcarrier numbers and its received SIR values are thinned out as a result.
  • FIG. 13 is a diagram for explaining the outline of the fourth thinning algorithm.
  • FIG. 14 is a flowchart for explaining the fourth thinning algorithm.
  • FIG. 15 is a diagram showing an example of a frame format used for notifying the base station 100 of the subcarrier number specified by using the fourth interleaved algorithm V and its received SIR value. is there.
  • the flow for detecting the subcarrier number and the received SIR value when the slope in the received SIR curve is reversed is the same as the flow shown in FIG. Description is omitted.
  • the reception SIR value between adjacent subcarriers is compared, and the subcarrier number when the slope in the reception SIR curve is reversed and its subcarrier number.
  • the received SIR value is extracted, and the received SIR value of the subcarrier arranged in the middle of the extracted subcarrier number is extracted.
  • the frame format used for notification to base station 100 includes the subcarrier number extracted as described above, its received SIR value, and subcarriers arranged between these subcarrier numbers.
  • the received SIR value is described.
  • the received SIR value, the 22nd subcarrier number arranged between the 18th subcarrier and the 27th subcarrier, and the received SIR value are described and notified to the base station 100. .
  • the subcarrier number arranged in the middle of the subcarriers between the sth reverse change point and the (s + 1) th reverse change point is calculated. (Step S64). Then, after extracting the calculated reception SIR value of the intermediate subcarrier (step S65), the reception SIR value is added to the frame format (step S66).
  • step S63 If it is determined in step S63 that the number of subcarriers is less than ⁇ , the process proceeds to step S67, and the process of steps S63 to S68 is performed again for the reverse change point (s + 1). To do. That is, when the number of subcarriers between the sth reverse change point and the (s + 1) th reverse change point is less than ⁇ , the subcarriers arranged in the middle are not calculated.
  • the subcarrier number of the first reverse change point is “ ⁇ ”
  • the subcarrier number of the second reverse change point is “ ⁇ ”
  • the subcarrier number of the third reverse change point is “C”.
  • ⁇ ⁇ ⁇ ⁇ Last reversal A specific example when the subcarrier number of the change point is “N” is shown. In this case, as shown in Fig. 15, the subcarrier number at each inversion change point and its received SIR value are Described in the format. Then, in step S64, a subcarrier number arranged between the Ath subcarrier and the Bth subcarrier is calculated. Thereby, ⁇ (A + B) Z2 ⁇ is calculated as the subcarrier number.
  • step S65 the received SIR value of the ⁇ (A + B) Z2 ⁇ -th subcarrier is extracted, and in step S66, it is added to the frame format.
  • the subcarrier number and the received SIR value when the slope in the received SIR curve is reversed are detected, and the subcarrier number whose slope is reversed.
  • the received SIR value of the subcarrier placed in between is detected and described in the frame format shown in Fig. 15.
  • the fourth decimation algorithm when the fourth decimation algorithm is used, the subcarrier number and the received SIR value when the slope in the received SIR curve is reversed are detected, and the subcarrier whose slope is reversed is detected.
  • the reception SIR value of the subcarrier arranged in the middle between the numbers is detected and notified to the base station 100 as radio propagation path information. For this reason, it is possible to significantly reduce the amount of radio propagation path information compared to the case of notifying the reception SIR values of all subcarriers, and to improve the transmission efficiency on the link for notifying the propagation path information.
  • the base station 100 since the subcarrier number and the received SIR value when the slope in the received SIR curve is reversed are notified, it is possible to prevent notification of a received SIR value that is significantly different from the actual received SIR value. it can. As a result, it is possible to avoid a situation in which a modulation scheme or the like that does not conform to the radio state is selected and communication errors increase, and it is possible to suppress the occurrence of errors during communication. Furthermore, since the reception SIR value of the subcarrier arranged in the middle between the subcarrier numbers whose slopes in the reception SIR curve are reversed is notified, the base station 100 based on this information sets the modulation method 'coding rate. It can be corrected. As a result, it is possible to select a modulation method or the like that is more suitable for the radio state, and it is possible to further suppress the occurrence of errors during communication.
  • the fifth decimation algorithm detects the subcarrier number and its received SIR value when the slope in the received SIR curve is reversed (decreased from increased calorie or increased decremental power), and the subcarrier number of which the slope is reversed. Detects subcarrier number having received SIR value in the middle between received SIR values It is. By notifying only the detected subcarrier number and its received SIR value to base station 100, the other subcarrier numbers and its received SIR values are thinned out as a result.
  • FIG. 16 is a diagram for explaining the outline of the fifth thinning-out algorithm.
  • FIG. 17 is a flowchart for explaining the fifth thinning algorithm.
  • FIG. 18 is a diagram showing an example of a frame format used to notify base station 100 of the subcarrier number specified by using the fifth decimation algorithm V and the received SIR value.
  • the flow for detecting the subcarrier number and the received SIR value when the slope in the received SIR curve is reversed is the same as the flow shown in FIG. Description is omitted.
  • the reception SIR values between adjacent subcarriers are compared, and the subcarrier number when the slope in the reception SIR curve is reversed and its subcarrier number.
  • the received SIR value is extracted, and further, the subcarrier number having the received SIR value that is an intermediate value of the extracted received SIR value is extracted.
  • the frame format used for notification to base station 100 includes a subcarrier number extracted as described above, its received SIR value, and a received SIR value that is an intermediate value of these received SIR values. Is described. If the example shown in FIG. 16 is used, the 1st, 5th, 18th, 27th, etc. subcarrier numbers and their received SIR values, as well as the 5th subcarrier received SIR value and the 18th subcarrier received It has a received SIR value that is the intermediate value between the SIR value and the received SIR value that is the intermediate value between the received SIR value of the 18th subcarrier and the received SIR value of the 27th subcarrier. The 21st subcarrier number is described and reported to base station 100
  • step S74 An intermediate value (becoming reception SIR value) between the reception SIR value of the carrier and the reception SIR value of the subcarrier corresponding to the (s + 1) th reverse change point is calculated (step S74). Then, after extracting the subcarrier number having the calculated intermediate value (step S75), the subcarrier number is added to the frame format (step S76).
  • step S73 If it is determined in step S73 that the number of subcarriers is less than ⁇ , the process proceeds to step S77, and the reverse change point (s + 1) is repeated again in steps S73 to S73.
  • Process S78 That is, if the number of subcarriers between the sth reverse change point and the (s + 1) th reverse change point is less than ⁇ , the intermediate value of the received SIR value of the corresponding subcarrier should not be calculated! /.
  • the reception SIR value of the subcarrier at the first reverse change point is “A”
  • the reception SIR value of the subcarrier at the second reverse change point is “B”
  • the third reverse change point The subcarrier reception SIR value is “C”
  • a specific example in which the reception SIR value of the subcarrier at the last reverse change point is “N” is shown.
  • the subcarrier number of each inversion change point and the received SIR value are described in the frame format.
  • step S74 an intermediate value between the received SIR value A and the received SIR value B is calculated.
  • ⁇ (A + B) Z2 ⁇ is calculated as the intermediate value.
  • step S75 the subcarrier number of the subcarrier having the reception SIR value closest to the intermediate value of ⁇ (A + B) Z2 ⁇ is extracted and added to the frame format in step S76.
  • the subcarrier number and the reception SIR value when the inclination in the reception SIR curve is reversed are detected, and the inclination is reversed.
  • An intermediate received SIR value between the received subcarrier number received SIR values is detected and described in the frame format shown in Fig.18.
  • the subcarrier number and the received SIR value when the slope in the received SIR curve is reversed are detected, and the subcarrier whose slope is reversed is detected.
  • the subcarrier number having an intermediate received SIR value between the received SIR values of the number is detected and notified to the base station 100 as radio propagation path information. For this reason, the amount of radio propagation path information can be significantly reduced compared to the case of notifying the reception SIR values of all subcarriers, and the transmission efficiency on the link for notifying the propagation path information can be improved. .
  • the base station 100 uses this information to modulate the modulation scheme.
  • the sign rate can be modified. As a result, it is possible to select a modulation method or the like that is more suitable for the radio state, and it is possible to further suppress the occurrence of errors during communication.
  • the first to fifth decimation algorithms described above can be used by switching according to, for example, the state of error in the radio propagation path.
  • the decimation algorithm is used by switching, it is necessary for the base station 100 and the mobile station 200 to recognize the selected decimation algorithm in common. The following describes the case where the received SIR information is reported by switching the thinning algorithm.
  • FIG. 19 is a diagram showing an example of a common table held in advance by the base station 100 and the mobile station 200.
  • notification numbers corresponding to the first to fifth decimation algorithms are registered.
  • Such a table is held in the base station 100 and the mobile station 200, and the selected thinning algorithm is shown in a frame format as shown in FIG. It is possible to share the common recognition algorithm selected by transmitting it to the base station 100 by describing it in the network.
  • a frame describing the number of the thinning algorithm (algorithm number) and the received SIR information shown in Figs. 5, 8, 12, 15, and 18 are described. And a frame.
  • the base station 100 can recognize the thinning algorithm selected by the mobile station 200 by reading out the algorithm number described in such a frame format and reading out the received SIR information.
  • a thinning algorithm is selected according to the error situation in the radio propagation path.
  • the method for determining the error in the radio propagation path is not particularly limited. For example, the actual received SIR value measured by the mobile station 200 for each m and the received SIR value of each m subcarrier calculated by each decimation algorithm are compared, and the decimation algorithm is the smallest.
  • the received SIR value of the subcarrier randomly selected by the mobile station 200 may be compared with the received SIR value of the corresponding subcarrier calculated by each decimation algorithm, and the thinning out with the smallest error.
  • An algorithm may be selected. It should be noted that, when the same error is detected in different thinning algorithms, it is preferable as an embodiment to select a thinning algorithm with a small amount of radio propagation information to be notified to the base station 100.
  • the most appropriate interleaving algorithm is selected according to the state of the radio propagation path to obtain the radio propagation path information as a base.
  • the station 100 can be notified.
  • the selection of the modulation method and coding rate is conventionally performed while reducing the amount of radio transmission path information. Therefore, it is possible to improve the transmission efficiency.
  • radio propagation path information in which the received SIR value of a specific subcarrier is thinned out by SIR 210 of mobile station 200 is created. Compared with the case where the received SIR value of the subcarrier is notified to the base station 100, it is possible to improve the transmission efficiency on the link for notifying the propagation path information.
  • radio propagation path information is generated based on the received SIR.
  • the present invention is not limited to this, but is not limited to reception SNR (signal power to noise power ratio) or reception SINR (signal power to interference noise power ratio: signal to noise power ratio). Based on the Interference Plus Noise Power Ratio), radio propagation path information may be generated.
  • the power describing the embodiment in the downlink from the base station 100 to the mobile station 200 is not limited to this. It is also possible to adapt to the uplink to Also in this case, it is possible to obtain the same effect as in the present embodiment.
  • a radio communication system that performs high-speed communication by adaptively changing the modulation scheme, coding rate, etc. for each subcarrier based on the radio propagation path state on the receiver side.
  • the Power Explained The present invention is not limited to this, but can also be applied to a radio communication system that performs high-speed communication by allocating subcarriers with good radio channel conditions to users based on radio channel conditions. It is.
  • FIG. 1 is a block diagram showing a configuration of a base station constituting a radio communication system according to the present invention.
  • FIG. 2 is a block diagram showing a configuration of a mobile station constituting the wireless communication system according to the present invention.
  • FIG. 3 is a diagram for explaining an outline of a first thinning algorithm.
  • FIG. 4 is a flowchart for explaining a first thinning-out algorithm.
  • FIG. 5 is a diagram showing an example of a frame format used for notifying a base station of a reception SIR value of a subcarrier identified using a first thinning algorithm.
  • FIG. 6 is a diagram for explaining an outline of a second thinning algorithm.
  • FIG. 7 is a flowchart for explaining a second thinning algorithm.
  • FIG. 8 is a diagram showing an example of a frame format used for notifying a base station of a reception SIR value of a subcarrier specified using a second thinning algorithm.
  • FIG. 9 is a diagram showing an example of a table of threshold values with respect to the slope of the received SIR curve in the second thinning algorithm.
  • FIG. 10 is a diagram for explaining an outline of a third thinning algorithm.
  • FIG. 11 is a flowchart for explaining a third thinning algorithm.
  • FIG. 12 is a diagram showing an example of a frame format used for notifying a base station of a reception SIR value of a subcarrier specified using a third thinning algorithm.
  • FIG. 13 is a diagram for explaining an outline of a fourth inter-bow I-cut algorithm.
  • FIG. 14 is a flowchart for explaining a fourth thinning algorithm.
  • FIG. 15 is a diagram showing an example of a frame format used for notifying a base station of a reception SIR value of a subcarrier specified using a fourth thinning algorithm.
  • FIG. 16 is a diagram for explaining the outline of a fifth thinning algorithm.
  • FIG. 17 is a flowchart for explaining a fifth thinning-out algorithm.
  • FIG. 18 is a diagram showing an example of a frame format used for notifying a base station of a reception SIR value of a subcarrier specified using a fifth thinning algorithm.
  • FIG. 19 is a diagram showing an example of a common table held in advance by the base station and the mobile station.
  • FIG. 20 is a diagram showing an example of a frame format for notifying the base station of the thinning algorithm selected by the mobile station.
  • FIG. 21 is a diagram illustrating an example of transmission power at the time of transmission with a base station power.
  • FIG. 22 is a diagram showing an example of a received signal of a mobile station when affected by frequency forging.
  • FIG. 23 is a diagram showing an example of a communication scheme for determining a modulation scheme 'code rate based on a reception SIR of a mobile station.
  • FIG. 24 is a diagram for explaining a conventional method of notifying propagation path information.
  • FIG. 25 is a diagram for explaining an example of a modulation scheme selected from a conventional method of notifying propagation path information.
  • Base station 100 Base station equipment (Base station)

Abstract

Le problème à résoudre dans le cadre de la présente invention consiste à améliorer l'efficacité de transmission sur une liaison pour transmettre des informations sur le chemin de propagation, tout en supprimant la génération d'une erreur lors de la communication. Le moyen de résoudre le problème consiste à utiliser un transmetteur sans fil, doté d'une section d'estimation de SIR (207) pour estimer le SIR de réception d'un signal sans fil reçu de l'autre partie de communication, une section de création d'informations SIR (210) pour créer des informations sur le chemin de propagation sans fil dans lequel une valeur SIR de réception d'une sous-porteuse spécifique est décimée conformément aux résultats d'estimation de la section d'estimation SIR (207), enfin une section de traitement de la transmission de la liaison montante (211) pour transmettre les informations sur le chemin de propagation sans fil créées par la section de création d'informations SIR (210) à l'autre partie de communication. La section de création des informations SIR (210) crée les informations sur le parcours de propagation sans fil uniquement à partir des valeurs SIR de réception pour chaque numéro prescrit de sous-porteuse, un numéro de sous-porteuse ayant la plus grosse erreur par rapport à la valeur SIR de réception réelle et la valeur SIR de réception.
PCT/JP2006/303051 2005-04-08 2006-02-21 Transmetteur et systeme de communication sans fil WO2006112133A1 (fr)

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