JP4537296B2 - Communication control device and communication terminal device - Google Patents

Description

  The present invention, when receiving retransmission request data for requesting retransmission of data from a communication partner, detects an error in data received from the communication partner, and a communication control device that retransmits data to the communication partner In this case, the present invention relates to a communication terminal apparatus that requests the communication partner to retransmit data.

  In recent years, research and development of the next generation wireless communication system of IMT-2000 (International Mobile Telecommunication 2000) has been promoted. For example, as proposed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2004-297756), there is a wireless communication system in which the principle of IFDMA is applied to DS-CDMA as one of the promising candidates (hereinafter referred to as “wireless communication system”). A ”). This wireless communication system A can keep the peak power to average power ratio low compared to a wireless communication system using a large number of subcarriers such as OFDM (Orthogonal Frequency Division Multiplexing) and multicarrier CDMA. It is based on DS-CDMA, which has advantages such as high pilot channel power per carrier in the uplink and reduced interference from neighboring cells in a multi-cell environment.

  The radio communication system A applies IFDMA principles in which symbols are repeated and signals from each mobile station are arranged so as not to overlap each other on the frequency axis by multiplying the phase sequence unique to the mobile station. . Specifically, the repetition unit is performed in units of chips instead of symbols. The radio communication system A realizes a radio communication system suitable for a multi-cell environment while maintaining high frequency utilization efficiency by applying IFDMA to DS-CDMA.

  FIG. 22 is a block diagram illustrating a schematic configuration of a transmission unit of the wireless communication system A. In the transmission unit 200, the transmission control unit 201 controls the parameters of each block of the transmission unit 200, and outputs control information regarding the parameters set in each block. Channel coding section 202 performs channel coding on the data signal transmitted from the upper layer at the coding rate input from transmission control section 201. Modulation section 203 modulates the channel encoded data signal using the modulation scheme input from transmission control section 201. Spreading section 204 multiplies the modulated data signal with the spreading code input from transmission control section 201 and performs spreading. The chip repetition unit 205 rearranges the spread data signal by the chip length (Q chip) input from the transmission control unit 201, and similarly, the Q repetition number (CRF number) input from the transmission control unit 201 is Q. It repeats with a chip as a cycle. The phase multiplication unit 206 multiplies the chip repetition data signal by the phase sequence with the phase sequence input from the transmission control unit 201. Radio section 207 converts the data signal input from phase multiplication section 206 into a radio signal, and transmits the data signal via transmission / reception antenna 208.

  FIG. 23 is a diagram illustrating main operations of the wireless communication system A. The modulated data symbol sequence is divided into blocks for each Q chip in order to perform chip repetition after spreading with a spreading code of spreading factor SF. Next, each chip length of the Q chip is compressed and repeated CRF times for each Q chip, thereby generating a series to which chip repetition is applied.

  FIG. 24 is a diagram illustrating an example of a frequency spectrum formed by a transmission signal. Since the generated series has a constant chip pattern with a Q chip as a period, only a limited component exists in the frequency spectrum, and the comb-shaped frequency spectrum shown in FIG. 24 is generated. Here, the number of comb teeth is Q, and the distance between the comb teeth and the comb teeth is (CRF-1). FIG. 24 shows a case where CRF = 3. Further, in order to allocate orthogonal comb-shaped frequency spectrum between simultaneously accessed mobile stations in a cell, a unique phase sequence different for each mobile station is multiplied. As shown in FIG. 24, orthogonalization in the frequency domain between the mobile station A and the mobile station B can be realized by multiplying the series after the chip repetition by a phase sequence different between the mobile station A and the mobile station B. it can.

  Also, a method has been proposed for realizing variable rate transmission by changing the distribution of Q and CRF while keeping the value of (Q × CRF) constant when repeating a Q chip length block CRF times ( For example, Non-Patent Document 1).

  FIG. 25 is a diagram showing changes in the frequency spectrum when the distribution of Q and CRF is changed while keeping Q × CRF constant. As shown in FIG. 25, it can be seen that the frequency spectrum formed according to Q and CRF changes, that is, the transmission rate changes.

  FIG. 26 is a block diagram illustrating a schematic configuration of a receiving unit of the wireless communication system A. In the reception unit 240, the reception control unit 241 controls the parameters of each block of the reception unit 240, and outputs control information related to the parameters set in each block, in other words, the parameters used in the transmission unit 200. The wireless unit 242 receives a data signal via the transmission / reception antenna 208 and converts the analog wireless signal into a digital baseband signal. The phase multiplication unit 243 multiplies the digital baseband signal by the phase sequence input from the reception control unit 241 and returns the phase of the data signal multiplied by the transmission unit 200 to the original phase again.

  The chip repetition combining unit 244 recombines the data signal subjected to chip repetition input from the phase multiplication unit 243 with the number of repetitions and the chip length input from the reception control unit 241. The despreading unit 245 performs despreading by multiplying the data signal synthesized by chip repetition using the spreading code input from the reception control unit 241. Demodulation section 246 demodulates the despread data signal using the modulation scheme input from reception control section 241. Channel decoding section 247 performs channel decoding on the demodulated data signal at the coding rate input from reception control section 241. The channel-decoded binary data signal is sent to the upper layer.

In addition, since an error occurs in a received data signal in a poor propagation path environment, there is a wireless communication system that retransmits a transmission data signal composed of the same information as one technique for realizing good communication. As a method of retransmission, as a method mainly aimed at the time diversity effect, the transmission side transmits a transmission data signal similar to the transmission data signal in which an error has occurred on the reception side, and the reception side discards the erroneous reception data signal, As a method of demodulating a retransmitted data signal (for example, Non-Patent Document 2) and a method of further increasing the SNR (Signal to Noise Ratio) in addition to the time diversity effect, an error has occurred on the receiving side on the transmitting side. A method in which a transmission data signal similar to a transmission data signal is transmitted, and a receiving side synthesizes an erroneous received data signal with a retransmitted data signal and demodulates the signal (Chase combining method) (for example, Non-Patent Document 3), time diversity In addition to the effects, a method for further improving the coding gain is that the transmitting side generates errors on the receiving side. A transmission data signal generated by using a punctured code based on an erasure rule different from the transmitted transmission data signal, and the receiving side decodes the erroneous reception data signal and the retransmitted data signal together (Incremental Redundancy method) (For example, Non-Patent Document 4) has been proposed and used in the past.
JP 2004-297756 A 2004 IEICE Communication Society B-5-40 "Uplink Variable Spreading Factor / Chip Repetition Factor (VSCRF)-Variable Rate Transmission Method for CDMA Broadband Wireless Access" “Automatic repeat request error control schemes” Lin, D.D. J. et al. Costello, and M.C. J. et al. Miller, IEEE Trans. Commun. Mag. , Vol. 22, PP. 5-17, Dec. 1984 “A Diversity Combining DS / CDMA system with conventional encoding and Viterbi decoding”. Souissi and S. Wicker, IEEE Trans. Veh. Techol. , Vol. 44, no. 2, PP. 304-312, May 1995 “Rate-compatible calibrated convolutional codes and their applications” Hagenauer, IEEE Trans. Commun. , Vol. 36, PP. 389-400, April 1988

  However, when the temporal change of the propagation path environment is very gradual, the propagation path environment is almost the same at the time of initial transmission and retransmission, and there is a situation where the propagation path environment is very poor even at the time of retransmission. Under such circumstances, even if the Chase combining method or the Incremental Redundancy method is used, the degree of error improvement is small at a very small number of retransmissions, and the degree of error improvement is large at a very large number of retransmissions, but the retransmission delay increases. This leads to a decrease in throughput.

  Since there is an interval between initial transmission and retransmission due to transmission delay, processing delay, etc., the base station device is initially set in the mobile station device due to an increase in the number of connected mobile stations and an increase in required transmission rate during the interval. If radio resources different from those at the time of transmission are allocated to the mobile station apparatus, the base station apparatus cannot determine or allocate radio resources suitable for the retransmission method. Therefore, it is necessary to notify the mobile station apparatus of information related to the radio resource at the time of initial transmission in the same manner as the retransmission request, or to store and hold information related to the radio resource of the data signal requested for retransmission in the base station apparatus for a certain period. There is.

  The present invention has been made in view of such circumstances, and in a wireless communication system that performs retransmission, by forming different frequency spectra using different phase sequences at the time of retransmission, the degree of improvement in error due to retransmission is further increased. An object of the present invention is to provide a communication control device and a communication terminal device that can be improved and can realize good communication.

  (1) In order to achieve the above object, the present invention takes the following measures. That is, the communication control apparatus according to the present invention includes a retransmission request information requesting retransmission of data from a communication partner, a modulation scheme of data in which an error has occurred, a coding rate, a chip pattern, the number of repetitions, and a phase sequence. Is a communication control device that retransmits data to the communication partner when receiving retransmission request data including: a modulation scheme, a coding rate, a chip pattern, based on the received retransmission request data Retransmission radio resource control unit that generates retransmission radio resource control information used at the time of data retransmission, including the number of repetitions and a phase sequence, and retransmission radio resource control information generated by the retransmission radio resource control unit, A transmission control unit that outputs control information related to the communication partner, based on the control information output from the transmission control unit And it is characterized in that and a radio transmitting unit that transmits the retransmission radio resource control information and retransmitted data.

  In this way, retransmission request data including a retransmission request information for requesting retransmission of data from a communication partner, and a modulation scheme, coding rate, chip pattern, number of repetitions, and phase sequence of data in which an error has occurred. If received, based on the retransmission request data, generates retransmission radio resource control information to be used at the time of data retransmission, including modulation scheme, coding rate, chip pattern, number of repetitions, and phase sequence, and reproduces the radio resource control Since the information and the retransmission data are transmitted to the communication partner, it is possible to allocate radio resources appropriate for the reproduction process. As a result, it is possible to improve the degree of error improvement due to retransmission and realize good communication.

  (2) The communication control device according to the present invention is a communication control device that requests retransmission of data to the communication partner when detecting an error in the data received from the communication partner. A retransmission radio resource control unit that generates a retransmission radio resource control information used when the communication partner retransmits data, including a modulation scheme, a coding rate, a chip pattern, a repetition count, and a phase sequence, based on data, and a radio parameter A transmission control unit that outputs control information regarding the transmission, and a retransmission requesting the communication partner to retransmit the generated retransmission radio resource control information and data based on the control information output from the transmission control unit And a wireless transmission unit for transmitting request information.

  Thus, when an error in data received from a communication partner is detected, based on the received data, including a modulation scheme, coding rate, chip pattern, number of repetitions, and phase sequence, Since retransmission radio resource control information to be used is generated and the reproduction radio resource control information and retransmission request information are transmitted to the communication partner, it is possible to allocate radio resources appropriate for reproduction processing. As a result, it is possible to improve the degree of error improvement due to retransmission and realize good communication.

  (3) Moreover, in the communication control apparatus according to the present invention, the retransmission radio resource control unit selects a phase sequence different from the phase sequence assigned at the time of initial transmission by the transmission control unit, and transmits retransmission radio resource control information. It is characterized by generating.

  In this way, retransmission radio resource control information is generated by selecting a phase sequence different from the phase sequence assigned at the time of initial transmission, so that a frequency diversity effect can be obtained and an error rate at the time of retransmission can be improved. It becomes.

  (4) Further, in the communication control apparatus according to the present invention, the retransmission radio resource control unit is located farthest from a frequency spectrum constituting a phase sequence allocated at the time of initial transmission by the transmission control unit on the frequency axis. And retransmission radio resource control information is generated by selecting a phase sequence in which a frequency spectrum is formed at the detected position.

  In this way, retransmission radio resource control information is generated by selecting a phase sequence in which the frequency spectrum is formed at a position farthest from the frequency spectrum constituting the phase sequence assigned at the time of initial transmission by the transmission control unit. It becomes possible to lower the correlation between the frequency spectrums at the time of transmission and at the time of retransmission, and it is possible to further improve the frequency diversity effect.

  (5) Moreover, in the communication control apparatus according to the present invention, the retransmission radio resource control unit is adjacent on a frequency axis in a frequency spectrum constituting a phase sequence assigned at the time of initial transmission by the transmission control unit. It is characterized by detecting the position where the sum of squares of the distance from the frequency spectrum is the smallest.

  In this way, since the position where the sum of squares of the distances from the adjacent frequency spectrum is the smallest is detected, the position farthest from the frequency spectrum constituting the phase sequence assigned at the time of initial transmission by the transmission control unit can be easily and reliably determined. Can be detected.

  (6) Moreover, in the communication control apparatus according to the present invention, the retransmission radio resource control unit, when retransmission is performed for the second time or more, the phase sequence assigned by the transmission control unit at the time of initial transmission and the previous retransmission. The retransmission radio resource control information is generated by selecting a phase sequence different from the above.

  As described above, when retransmission is performed for the second time or more, the transmission control unit generates retransmission radio resource control information by selecting a phase sequence different from the phase sequence assigned at the time of initial transmission and the previous retransmission. Even when retransmission is performed a plurality of times, a frequency diversity effect can be obtained and an error rate at the time of retransmission can be improved.

  (7) Moreover, in the communication control apparatus according to the present invention, the retransmission radio resource control unit may perform the initial transmission and the previous retransmission by the transmission control unit on the frequency axis when the retransmission is performed for the second time or more. It is characterized in that a position farthest from the frequency spectrum constituting the assigned phase sequence is detected, and a retransmission is performed by selecting a phase sequence in which the frequency spectrum is formed at the detected position.

  As described above, when the retransmission is performed for the second time or more, the frequency spectrum is located on the frequency axis at a position farthest from the frequency spectrum constituting the phase sequence assigned at the time of initial transmission and the previous retransmission by the transmission control unit. Since retransmission radio resource control information is generated by selecting the phase sequence to be formed, the frequency spectrum formed between when transmission is completed, that is, when there is no error or when the maximum number of retransmissions is reached Correlation can be lowered, and the frequency diversity effect can be further improved.

  (8) Moreover, in the communication control apparatus according to the present invention, the retransmission radio resource control unit is a frequency that constitutes a phase sequence assigned at the time of initial transmission and retransmission up to the previous time by the transmission control unit on the frequency axis. A position having the largest sum of distances from the spectrum is specified, and a position having the smallest sum of squares of the distances from the specified position is detected.

  As described above, the position where the sum of the distances from the frequency spectrum constituting the phase sequence assigned at the time of initial transmission and the previous retransmission is identified is the largest, and the position where the sum of squares of the distance from the identified position is the smallest. Therefore, it is possible to easily and reliably detect the position farthest from the frequency spectrum constituting the phase sequence assigned at the time of initial transmission and the previous retransmission by the transmission control unit.

  (9) Moreover, in the communication control apparatus according to the present invention, the retransmission radio resource control unit includes a modulation multilevel number used at the time of initial transmission, a coding rate, and a modulation multilevel number that is smaller than the number of repetitions. In addition to selecting a coding rate and the number of repetitions, retransmission radio resource control information is generated by selecting a chip length that is larger than the chip length used during initial transmission.

  In this way, at the time of retransmission, the modulation multi-level number, coding rate, and number of repetitions that are smaller than the number of modulation multi-levels used at the time of initial transmission, the coding rate, and the number of repetitions are selected. Since retransmission radio resource control information is generated by selecting a chip length that is larger than the used chip length, the frequency spectrum used is expanded, the transmission rate is maintained, the error rate is improved, and data communication is performed. It is possible to shorten the completion time and realize good communication.

  (10) Further, in the communication control apparatus according to the present invention, the retransmission radio resource control unit is used at the time of initial transmission when it is estimated that a reception state at the time of retransmission deteriorates based on data received from a communication partner. Select the modulation multi-level number, coding rate, and the number of modulation multi-levels, coding rate, and repetition count smaller than the number of repetitions, and the chip length greater than the chip length used during initial transmission. And retransmission radio resource control information is generated.

  In this way, when it is estimated that the reception situation at the time of retransmission is deteriorated, the modulation multi-level number and coding rate used at the time of initial transmission, and the modulation multi-level number and coding rate smaller than the number of repetitions, and In addition to selecting the number of repetitions and selecting a chip length that is larger than the chip length used at the time of initial transmission, retransmission radio resource control information is generated, so the frequency spectrum expansion is controlled appropriately to reduce throughput. It can be avoided. In order to estimate the reception status at the time of retransmission, in the case of the downlink, the communication partner has a function of measuring the reception status (for example, including a reception status measurement unit), and the measurement result is transmitted to the main communication. It will be transmitted to the control device. In the case of the uplink, the communication control apparatus has a function of measuring the reception status (for example, including a reception status measurement unit).

  (11) Further, in the communication control apparatus according to the present invention, the transmission control unit preferentially assigns a phase sequence to a communication partner that needs to be retransmitted, and then sets a communication partner that performs normal transmission. It is characterized in that a phase sequence is assigned to it.

  In this way, the phase sequence is preferentially assigned to the communication partner that needs to be retransmitted, and then the phase sequence is assigned to the communication partner that performs normal transmission. Therefore, it is possible to easily assign a desired phase sequence.

  (12) A communication terminal apparatus according to the present invention is a communication terminal apparatus that requests retransmission of data to the communication partner when detecting an error in data received from the communication partner, A retransmission request data generating unit for generating retransmission request data including retransmission request information for requesting, modulation method information of data in which an error has occurred, coding rate, chip pattern, number of repetitions, and phase sequence, and The wireless transmission part which transmits the retransmission request data produced | generated by the retransmission request data production | generation part to the communication control apparatus in any one of Claim 1, Claim 3 to 11 is characterized by the above-mentioned.

  Thus, since retransmission request data is transmitted to any one of the communication control apparatuses described above, the communication control apparatus that has received the retransmission request data can perform the retransmission control described above.

  (13) The communication terminal apparatus according to the present invention is a communication terminal apparatus that requests retransmission of data to the communication partner when an error in data received from the communication partner is detected. A retransmission request data generation unit for generating retransmission request data including retransmission request information for requesting data, modulation scheme information of an erroneous data, coding rate, chip pattern, number of repetitions, and phase sequence, and communication Based on the data received from the other party, a reception status estimation unit that estimates the reception status at the time of retransmission, the retransmission request data generated by the retransmission request data generation unit, and the retransmission status estimated by the reception status estimation unit The reception status is transmitted to the communication control device according to claim 10.

  Thus, since the retransmission request data and the reception status at the time of retransmission estimated by the reception status estimation unit are transmitted to the communication control device, the communication control that has received the retransmission request data and the estimated reception status at the time of retransmission. The apparatus can perform the above retransmission control.

  (14) Further, a base station apparatus according to the present invention includes the communication control apparatus according to any one of claims 1 to 11.

  According to the base station apparatus of the present invention, retransmission radio resource control information used at the time of data retransmission is generated, and the retransmission radio resource control information and retransmission data are transmitted to the communication partner. Can be assigned.

  (15) Moreover, the mobile station apparatus according to the present invention is characterized by including the communication terminal apparatus according to claim 12 or claim 13.

  According to the mobile station apparatus of the present invention, retransmission request data is transmitted to the base station apparatus provided with the communication control apparatus, so that the base station apparatus that has received the retransmission request data can perform the retransmission control described above. It becomes.

  (16) Further, the radio communication system according to the present invention is characterized by comprising a base station apparatus according to claim 14 and a mobile station apparatus according to claim 15.

  According to the radio communication system of the present invention, the base station apparatus generates retransmission radio resource control information used at the time of data retransmission, and transmits the retransmission radio resource control information and retransmission data to the mobile station apparatus. It is possible to allocate an appropriate radio resource.

  According to the present invention, when retransmission request data requesting retransmission of data is received from a communication partner, retransmission radio resource control information used at the time of data retransmission is generated based on the retransmission request data, and the retransmission radio Since the resource control information and the retransmission data are transmitted to the communication partner, it is possible to allocate radio resources appropriate for the retransmission process. As a result, it is possible to improve the degree of error improvement due to retransmission and realize good communication. In particular, it has a remarkable effect when applied to a communication system using IFDMA.

  Next, embodiments of the present invention will be described with reference to the drawings. Here, an example in which the communication control apparatus according to the present invention is applied to a base station apparatus and the communication terminal apparatus according to the present invention is applied to a mobile station apparatus will be described. In addition, embodiment described below is only an example of this invention and is not limited to these.

(First embodiment)
In the downlink, the base station apparatus according to the first embodiment is notified of retransmission request data including retransmission request information, modulation scheme, coding rate, chip pattern, repetition count, and phase sequence from the mobile station apparatus. Based on the received retransmission request data, retransmission to the mobile station apparatus is controlled. Thereby, the base station apparatus can allocate radio resources appropriate for retransmission processing to the mobile station apparatus.

  FIG. 1 is a block diagram showing a schematic configuration of a base station apparatus according to the first embodiment of the present invention, and shows a block used when performing retransmission in the downlink. The base station apparatus 1 includes a transmission unit 2, a reception unit 3, a retransmission radio resource control unit 4, and a transmission / reception antenna 5. The transmission unit 2 includes a transmission control unit 7, a channel encoding unit 8, a modulation unit 9, a spreading unit 10, a chip repetition unit 11, a phase multiplication unit 12, and a radio unit 13.

  Based on the retransmission request data notified from the mobile station device, retransmission radio resource control unit 4 selects an appropriate modulation scheme, coding rate, chip pattern, number of repetitions, and phase sequence according to the retransmission method to be used, The selected retransmission radio resource control information is output to the transmission control unit 7.

  The transmission control unit 7 controls the parameters of each block of the transmission unit 2, and regarding retransmission to the mobile station apparatus, the transmission control unit 7 assigns each block based on the retransmission radio resource control information input from the retransmission radio resource control unit 4. Outputs control information related to the set retransmission parameters.

  Channel coding unit 8 performs channel coding on the retransmission data signal at the coding rate input from transmission control unit 7. Modulation section 9 modulates the channel-coded retransmission data signal using the modulation scheme input from transmission control section 7. The spreading unit 10 performs multiplication by multiplying the modulated retransmission data signal with the spreading code input from the transmission control unit 7. The chip repetition unit 11 rearranges the spread retransmission data signal by the chip length (Q chip) input from the transmission control unit 7 and similarly uses the number of repetitions (CRF number) input from the transmission control unit 7. Repeat with Q chip as a cycle.

  The phase multiplication unit 12 multiplies the chip sequence retransmission data signal by the phase sequence with the phase sequence input from the transmission control unit 7. The radio unit 13 converts the retransmission data signal input from the phase multiplication unit 12 into a radio signal, and retransmits the data signal via the transmission / reception antenna 5.

  The receiving unit 3 receives the signal transmitted from the mobile station apparatus, and outputs the retransmission request data to the retransmission radio resource control unit 4 when receiving the retransmission request data signal.

  Note that the radio resource information assigned to the mobile station apparatus is numbered for each data signal by the retransmission radio resource control unit and stored and held for a certain period of time, for example, until an ACK signal (reception completion notification) is notified from the mobile station apparatus. It is good also as a structure to keep. In that case, only the retransmission request information is notified from the mobile station apparatus.

  Further, the channel encoding unit 8, the modulation unit 9, the spreading unit 10, the chip repetition unit 11, the phase multiplication unit 12, and the radio unit 13 constitute a radio transmission unit.

  FIG. 2 is a block diagram illustrating a schematic configuration of the base station apparatus according to the first embodiment of the present invention, and illustrates a block used when performing retransmission in the uplink. In the uplink, when the data received from the mobile station device is incorrect, the base station device according to the first embodiment outputs a direct error result to the retransmission radio resource control unit 4 and the retransmission radio resource control information. Retransmission request information is notified to the mobile station apparatus.

  In the reception unit 3, the reception control unit 15 controls the parameters of each block of the reception unit 3, and outputs control information related to the parameters set in each block, in other words, the parameters used in the transmission unit 2.

  The wireless unit 16 receives a data signal via the transmission / reception antenna 5 and converts the analog wireless signal into a digital baseband signal. The phase multiplying unit 17 multiplies the digital baseband signal with the phase sequence input from the reception control unit 15 and returns the phase of the data signal multiplied in the transmitting unit 2 to the original phase again. The chip repetition synthesizer 18 re-synthesizes the data signal subjected to the chip repetition input from the phase multiplier 17 with the number of repetitions input from the reception controller 15 and the chip length.

  The despreading unit 19 performs despreading by multiplying the data signal synthesized by chip repetition using the spreading code input from the reception control unit 15. The demodulator 20 demodulates the despread data signal using the modulation method input from the reception controller 15. The channel decoding unit 22 performs channel decoding on the demodulated data signal at the coding rate input from the reception control unit 15.

  Further, when retransmission is performed, the demodulator 20 outputs the demodulated data signal to the packet combiner 21 in order to combine an erroneous data signal and retransmission signal. In the case combining method, there are a method of combining with a symbol sequence before demapping and a method of combining with a bit sequence after demapping, so that a demodulated data signal is output to the packet combining unit 21 according to the method used. To do. In the incremental redundancy method, the demapped bit sequence is output to the packet combining unit 21.

  When the incremental redundancy method is used as the packet combining method, or when the retransmission data signal is retransmitted by changing the coding rate, a parameter different from the erroneous data signal is input to the channel decoding unit 22, and the parameter The channel decoding according to is performed.

  The error detection unit 23 detects an error in the binary data signal input from the channel decoding unit 22 and outputs the result to the packet combining unit 21, the retransmission radio resource control unit 4, and the transmission unit 2. If no error is detected, a binary data signal is sent to the upper layer, and if an error is detected, the channel-decoded binary data signal is discarded. When the upper limit of the number of retransmissions is reached, even if an error is detected, a binary data signal is sent to the upper layer.

  The packet combiner 21 temporarily stores the data signal input from the demodulator 20, combines it with the retransmission data signal, and then outputs the combined data signal to the channel decoder 22. In the case combining method, the packet combining unit 21 performs weighted combining (maximum ratio combining) on the data signal using the estimated coefficient of the channel fluctuation value, and performs demapping and combining the data signal into the bit sequence when combining with the symbol sequence. After conversion, the data is output to the channel decoding unit 22, and when the bit sequence is combined, the weighted data signal is output to the channel decoding unit 22 as it is. In the incremental redundancy method, the packet combining unit 21 rearranges the temporarily stored erroneous data signal and the retransmitted data signal and outputs the adjusted data signal to the channel decoding unit 22. Here, when notified from the error detection unit 23 that no error has been detected, the packet combining unit 21 discards the corresponding temporarily stored data signal.

  Based on the error detection result input from error detector 23, retransmission radio resource controller 4 selects an appropriate modulation method, coding rate, chip pattern, number of repetitions, and phase sequence according to the retransmission method to be used. The selected retransmission radio resource control information is output to the transmitter 2.

  When notified from the error detection unit 23 that the error has been detected, the transmission unit 2 uses the modulation method, coding rate, chip pattern, number of repetitions, phase used for the reception processing of the data signal in which the error has been detected. Retransmission request data including a sequence and retransmission request information (NACK) is generated, and retransmission radio resource control information input from retransmission radio resource control unit 4 is transmitted to the mobile station apparatus together with the retransmission request data. Moreover, a transmission part transmits reception completion information (ACK) to a mobile station apparatus, when it is notified from the error detection part that an error was not detected.

  As described above, when performing retransmission in the downlink, retransmission radio resource control information used at the time of data retransmission is generated based on retransmission request data received from the mobile station apparatus, and the retransmission radio resource control information and retransmission data are generated. Is transmitted to the mobile station apparatus, so that radio resources appropriate for the retransmission process can be allocated. Also, when performing retransmission on the uplink, based on erroneous data received from the mobile station apparatus, the mobile station apparatus generates retransmission radio resource control information used at the time of data retransmission, and the retransmission radio resource control information and retransmission Since the request information is transmitted to the mobile station apparatus, it is possible to allocate radio resources appropriate for retransmission processing.

(Second Embodiment)
The base station apparatus according to the second embodiment performs retransmission by allocating a phase sequence different from that during initial transmission to the mobile station apparatus during retransmission. Thereby, the frequency diversity effect can be further obtained, and the error rate of retransmission can be improved.

  The configuration of the transmission unit of the base station apparatus according to the second embodiment is the same as that of the first embodiment shown in FIG. 1 and FIG. The second embodiment can be applied to both the downlink and the uplink. Here, description will be given taking retransmission in the downlink as an example.

  Retransmission radio resource control unit 4 selects a phase sequence different from the phase sequence assigned at the time of initial transmission, and outputs retransmission radio resource control information to transmission control unit 7.

  FIG. 3 is a diagram illustrating an example of a frequency spectrum formed by a transmission signal of the base station apparatus according to the second embodiment. As shown in FIG. 3, by making the frequency spectrum formed at a constant period different between initial transmission and retransmission, a wide total frequency spectrum is used.

  FIG. 4 is a flowchart showing an operation related to retransmission radio resource control of the base station apparatus according to the second embodiment. First, retransmission request data is received from the mobile station apparatus (step L1). Next, a phase sequence different from that at the initial transmission is assigned to the retransmission data signal based on the retransmission request data (step L2). Next, radio resource control information is notified to the mobile station apparatus using the control channel (step L3). Next, the retransmission data signal generated using the phase sequence assigned using the data channel is transmitted (step L4).

  As described above, according to the second embodiment, the retransmission radio resource control information is generated by selecting a phase sequence different from the phase sequence assigned at the time of initial transmission, so that the frequency diversity effect can be obtained and It is possible to improve the error rate.

(Third embodiment)
The base station apparatus according to the third embodiment allocates a phase sequence different from that at the time of initial transmission to the mobile station apparatus at the time of retransmission, and the frequency spectrum formed at the time of retransmission is among the selectable frequency spectrum patterns. A phase sequence is assigned so as to be at the farthest position, and retransmission is performed. Thereby, the correlation between the frequency spectrums at the time of initial transmission and at the time of retransmission can be lowered, and the frequency diversity effect can be further improved.

  The configuration of the transmission unit of the base station apparatus according to the third embodiment is the same as that of the first embodiment shown in FIG. 1 and FIG. The third embodiment can be applied to both the downlink and the uplink. Here, a description will be given taking retransmission in the downlink as an example.

  The retransmission radio resource control unit 4 selects a phase sequence in which the frequency spectrum formed at the time of retransmission is located farthest from the initial transmission, and outputs the retransmission radio resource control information to the transmission control unit 7. Here, in order to detect the farthest position, the sum of squares of the distance between the frequency spectrum position at the time of retransmission and the frequency spectrum at the time of initial transmission on both sides is detected, so that the sum of squares becomes the smallest position. Assign a phase sequence.

  FIG. 5 is a diagram illustrating an example of a frequency spectrum formed by a transmission signal of the base station apparatus according to the third embodiment. As shown in FIG. 5, the frequency spectrum formed at a constant period is different at the time of initial transmission and at the time of retransmission, and the frequency spectrum at the time of retransmission is formed at a position farthest from the frequency spectrum position candidates. As a result, it is possible to use a total and wide frequency spectrum with low correlation for retransmission.

  FIG. 6 is a flowchart showing operations related to retransmission radio resource control of the base station apparatus according to the third embodiment. First, retransmission request data is received from the mobile station apparatus (step M1). Next, based on the retransmission request data, the frequency spectrum position where the sum of squares of the distance from the frequency spectrum at the initial transmission at both ends is the smallest among the frequency spectrum positions of the allocation candidates for the frequency spectrum at the initial transmission is detected. (Step M2). Here, it is determined whether or not there are a plurality of detected frequency spectrum positions (step M3). In Step M3, if there are not more than one, the process proceeds to Step M4, and a phase sequence that forms the detected frequency spectrum is assigned. On the other hand, in step M3, if there are a plurality, the process proceeds to step M5, where the phase sequence that forms the selected frequency spectrum is selected by randomly selecting from the detected frequency spectrum. This is because when the frequency spectrum at the time of initial transmission is an even number (CRF is an odd number greater than or equal to 3), the middle two frequencies between the frequency spectrum at the time of initial transmission are detected, and thus the above-described processing needs to be performed. Because. Next, radio resource control information is notified to the mobile station apparatus using the control channel (step M6). Next, the retransmission data signal generated using the phase sequence assigned using the data channel is transmitted (step M7).

  As described above, according to the third embodiment, the retransmission radio resource control information is selected by selecting the phase sequence in which the frequency spectrum is formed at the position farthest from the frequency spectrum constituting the phase sequence assigned at the time of initial transmission. Therefore, the correlation between the frequency spectrums at the time of initial transmission and at the time of retransmission can be lowered, and the frequency diversity effect can be further improved. Also, since the position where the sum of squares of the distance from the adjacent frequency spectrum is the smallest is detected, the position farthest from the frequency spectrum constituting the phase sequence assigned at the time of initial transmission by the transmission control unit can be detected easily and reliably. It becomes possible to do.

(Fourth embodiment)
The base station apparatus according to the fourth embodiment allocates a phase sequence different from that at the initial transmission to the mobile station apparatus at the time of retransmission, and assigns to the mobile station apparatus a phase sequence different from the phase sequence used so far when performing retransmission. Allocate and retransmit. As a result, even when retransmission is performed a plurality of times, it is possible to obtain a frequency diversity effect and improve the error rate of retransmission.

  The configuration of the transmission unit of the base station apparatus according to the fourth embodiment is the same as that of the first embodiment shown in FIG. 1 and FIG. Further, the fourth embodiment can be applied to both the downlink and the uplink. Here, a description will be given taking retransmission in the downlink as an example.

  Retransmission radio resource control unit 4 selects a phase sequence different from the phase sequence assigned at the time of initial transmission, selects a phase sequence different from the phase sequence used so far for the second and subsequent retransmissions, The resource control information is output to the transmission control unit 7.

  FIG. 7 is a diagram illustrating an example of a frequency spectrum formed when the transmission signal of the base station apparatus according to the fourth embodiment performs retransmission twice. As shown in FIG. 7, it is possible to use a total wide frequency spectrum by making the frequency spectrum formed at a constant period different at the time of initial transmission and at the time of retransmission.

  FIG. 8 is a flowchart showing operations related to retransmission radio resource control of the base station apparatus according to the fourth embodiment. First, retransmission request data is received from the mobile station apparatus (step N1). Next, based on the retransmission request data, a phase sequence different from the previous transmission is assigned to the retransmission data signal (step N2). Here, it is determined whether or not the assigned phase sequence has been set before (from the time of initial transmission to the time of previous retransmission) (step N3). Assign a phase sequence. On the other hand, if it has not been set in step N3, the mobile station apparatus is notified of radio resource control information using the control channel (step N4). Next, the retransmission data signal generated using the phase sequence assigned using the data channel is transmitted (step N5).

  In addition, when the phase sequence allocation is completed after performing retransmission a plurality of times, the storage of the allocated phase sequence held so far is reset, and the phase sequence allocation is performed again from the beginning. At that time, a phase sequence different from the previous retransmission is selected from the retransmission request data.

  As described above, according to the fourth embodiment, when retransmission is performed for the second time or more, retransmission radio resource control is performed by selecting a phase sequence different from the phase sequence allocated at the time of initial transmission and the previous retransmission. Since the information is generated, the frequency diversity effect can be obtained even when retransmission is performed a plurality of times, and the error rate at the time of retransmission can be improved.

(Fifth embodiment)
The base station apparatus according to the fifth embodiment is a base station apparatus that performs retransmission twice or more times, assigns a phase sequence different from the previously assigned phase sequence at the time of retransmission, and is a selectable frequency spectrum pattern. Thus, the phase sequence is allocated so as to be farthest from the frequency spectrum formed up to the previous retransmission, and retransmission is performed. As a result, the correlation between the frequency spectrums formed until the transmission is completed (when there is no error or when the maximum number of retransmissions is reached) can be lowered, and the frequency diversity effect can be further improved.

  The configuration of the transmission unit of the base station apparatus according to the fifth embodiment is the same as that of the first embodiment shown in FIG. 1 and FIG. First, retransmission in the downlink will be described.

  The retransmission radio resource control unit 4 selects a phase sequence so that the frequency spectrum formed at the time of this retransmission is farthest from the frequency spectrum formed up to the previous retransmission, and controls transmission of retransmission radio resource control information. Output to unit 7.

  Here, in order to detect the farthest position, the sum of the distance between the frequency spectrum position at the time of this retransmission and the frequency spectrum formed by the previous retransmission on both sides is detected, and the frequency spectrum with the largest detected sum is detected. Further, a sum of squares of the distance is detected, and a phase sequence is assigned so that the sum of the squares becomes the smallest position.

  FIG. 9 is a diagram illustrating an example of a frequency spectrum formed by a transmission signal of the base station apparatus according to the fifth embodiment. Here, the frequency spectrum up to three retransmissions is shown. As shown in FIG. 9, the frequency spectrum formed at a constant period is different for each initial transmission and retransmission, and at the position farthest from the frequency spectrum formed by the previous transmission for each retransmission. By forming a frequency spectrum, it is possible to use a frequency spectrum having a wide total and low correlation.

  FIG. 10 is a flowchart illustrating operations related to retransmission radio resource control of the base station apparatus according to the fifth embodiment. First, retransmission request data is received from the mobile station apparatus (step O1). Next, based on the retransmission request data, the frequency spectrum that has the largest sum of the distances from the frequency spectrum positions of the allocation candidates to the frequency spectrum at the previous transmission at both ends with respect to the frequency spectrum formed by the previous transmission. The position is detected (step O2). Next, the frequency spectrum position having the smallest sum of squares of the distances from the detected frequency spectrum position to the frequency spectrum at the previous transmission at both ends is detected (step O3). Here, it is determined whether or not there are a plurality of detected frequency spectrum positions (step O4). In step O4, if there are not more than one, the process proceeds to step O5, and a phase sequence that forms the detected frequency spectrum is assigned.

  On the other hand, in step O4, if there are a plurality, the process proceeds to step O6, where the phase sequence that forms the selected frequency spectrum is selected by randomly selecting from the detected frequency spectrum. This is because when the frequency spectrum formed by the previous transmission is an even number, the middle two between the frequency spectrums are detected in the process of step O3, and thus the above process needs to be performed. . Next, radio resource control information is notified to the mobile station apparatus using the control channel (step O7). Next, the retransmission data signal generated using the phase sequence assigned using the data channel is transmitted (step O8).

  Next, retransmission in the uplink will be described.

  FIG. 11 is a flowchart showing an operation related to retransmission radio resource control of the base station apparatus according to the fifth embodiment. First, when an error is detected in the data received from the mobile station apparatus (step S1), the frequency spectrum from the position of the allocation candidate frequency spectrum to the previous transmission time at both ends is compared with the frequency spectrum formed up to the previous transmission time. The frequency spectrum position having the largest sum of the distances is detected (step S2). Next, the frequency spectrum position where the sum of squares of the distance from the detected frequency spectrum position to the frequency spectrum at the previous transmission at both ends is the smallest is detected (step S3). Here, it is determined whether or not there are a plurality of detected frequency spectrum positions (step S4). If there are not more than one in step S4, the process proceeds to step S5, and a phase sequence forming the detected frequency spectrum is assigned (step S5).

  On the other hand, in step S4, if there are a plurality, the process proceeds to step S6, where a random selection is made from the detected frequency spectrum, and a phase sequence forming the selected frequency spectrum is assigned (step S6). This is because when the frequency spectrum formed up to the previous transmission is an even number, the middle two between the frequency spectra are detected in the process of step S3, and thus the above-described process needs to be performed. . Next, radio resource control information is notified to the mobile station apparatus using the control channel (step S7).

  As described above, according to the fifth embodiment, when retransmission is performed for the second time or more, on the frequency axis, the frequencies constituting the phase sequence allocated at the time of initial transmission and the previous retransmission by the transmission control unit. Retransmission radio resource control information is generated by selecting a phase sequence in which the frequency spectrum is formed at the position farthest from the spectrum, so when transmission is completed, that is, when there are no errors, or the maximum number of retransmissions is reached Thus, the correlation between the frequency spectra formed up to this time can be lowered, and the frequency diversity effect can be further improved. Also, the position where the sum of the distances from the frequency spectrum constituting the phase sequence assigned at the time of initial transmission and the previous retransmission is identified is the largest, and the position where the sum of squares of the distance from the identified position is the smallest is detected. Therefore, it is possible to easily and reliably detect the position farthest from the frequency spectrum constituting the phase sequence assigned at the time of initial transmission and the previous retransmission by the transmission control unit.

(Sixth embodiment)
The base station apparatus according to the sixth embodiment performs retransmission by lowering the number of modulation multilevels and / or the coding rate during retransmission, reducing the number of repetitions, and increasing the chip length. As a result, it is possible to extend the frequency spectrum to be used, improve the error rate while maintaining the transmission speed, shorten the data communication completion time, and achieve good communication.

  The configuration of the transmission unit of the base station apparatus according to the sixth embodiment is the same as that of the first embodiment shown in FIG. 1 and FIG. First, retransmission in the downlink will be described.

  The retransmission radio resource control unit 4 selects the modulation multi-level number or / and coding rate used at the time of initial transmission at the time of retransmission, the repetition count as a small value, and the chip length as a large value, and transmits the retransmission radio resource control information as a transmission control unit. 7 is output.

  Here, the phase sequence may be different from that at the time of initial transmission in accordance with the change in the number of repetitions and the chip length. Further, even in the control of changing the modulation multi-level number or / and coding rate, the number of repetitions, and the chip length for each retransmission, the modulation multi-level number or / and coding rate, the number of repetitions, and the chip length are changed for each retransmission. A changing control may be used.

  FIG. 12 is a diagram illustrating an example of a frequency spectrum formed by a transmission signal of the base station apparatus according to the sixth embodiment. Here, the number of modulation multi-values, the number of repetitions, and the chip length are changed for each retransmission, the coding rate remains constant, and the frequency spectrum up to the third retransmission is shown. As shown in FIG. 12, the modulation scheme is lowered while increasing the number of frequency spectra used for each retransmission. Specifically, at the first retransmission, the number of frequency spectrums used is increased by a factor of 2 compared with the initial transmission, and the modulation multi-value number is assigned by QPSK having a transmission rate of 1/2 times from 16 QAM. As can be seen from double × 1/2 multiple = 1, the data signal is retransmitted while making the total transmission rate at the initial transmission and the first retransmission equal. Further, the number of frequency spectrums used in the second retransmission is increased by a factor of two compared to the first retransmission, and BPSK having a transmission rate that is 1/2 times the modulation multilevel number from QPSK is assigned.

  FIG. 13 is a flowchart showing operations related to retransmission radio resource control of the base station apparatus according to the sixth embodiment. First, retransmission request data is received from the mobile station apparatus (step P1). Next, based on the retransmission request data, the radio resource allocated at the previous transmission is reduced in the number of modulation multilevels and / or coding rate, the number of repetitions is reduced, and the chip length is increased for the next retransmission. Time radio resource (step P2). Next, radio resource control information is notified to the mobile station apparatus using the control channel (step P3). Next, the retransmission data signal generated using the radio resource set using the data channel is transmitted (step P4).

  In the above description, the case where the transmission rate is made equal between the initial transmission, retransmission, and retransmission has been described. However, it is possible to change the retransmission processing on the reception side to transmit retransmission data at different transmission rates on the transmission side. it can.

  FIG. 14 is a flowchart illustrating retransmission in the uplink according to the sixth embodiment. First, when an error is detected in the data received from the mobile station apparatus (step F1), the modulation multi-value number and / or the coding rate is lowered with respect to the radio resource allocated at the previous transmission based on the retransmission request data. Then, the number of repetitions is reduced and the chip length is increased and assigned to the radio resource at the next retransmission (step F2). Next, radio resource control information is notified to the mobile station apparatus using the control channel (step F3).

  As described above, according to the sixth embodiment, at the time of retransmission, the number of modulation multilevels used at the time of initial transmission, the coding rate, and the number of modulation multilevels smaller than the number of repetitions, the coding rate, and While selecting the number of repetitions and selecting a chip length that is larger than the chip length used at the time of initial transmission to generate retransmission radio resource control information, the frequency spectrum to be used is expanded and the transmission rate is maintained. Therefore, it is possible to improve the error rate and shorten the data communication completion time to realize good communication.

(Seventh embodiment)
The base station apparatus according to the seventh embodiment lowers the modulation multi-level number and / or the coding rate when it is determined that the reception status further deteriorates during retransmission with respect to the base station apparatus according to the sixth embodiment. Then, the number of repetitions is reduced, the chip length is increased, and retransmission is performed. As a result, it is possible to appropriately control the expansion of the frequency spectrum, and to reduce the decrease in excess throughput.

  The configuration of the transmission unit of the base station apparatus according to the seventh embodiment is the same as that of the first embodiment shown in FIG. 1 and FIG. In addition, the seventh embodiment changes the modulation multi-level number and the like when it is determined that the reception state is deteriorated at the time of retransmission, and can be applied to both the downlink and the uplink. In the downlink, control is performed based on the reception status notification obtained from the mobile station apparatus, while in the uplink, control is performed based on detection of the reception status in the base station apparatus. First, a description will be given by taking retransmission in the downlink as an example.

  When the retransmission radio resource control unit 4 determines from the reception status information notified from the mobile station apparatus that the reception status deteriorates at the next retransmission, the modulation multi-level number or / and coding rate used in the previous transmission is repeated. A small number of times and a large chip length are selected, and retransmission radio resource control information is output to the transmission control unit 7. If it is not determined that the reception status at the next retransmission is deteriorated, a radio resource similar to that at the previous transmission is selected or a radio resource in which only the phase sequence is changed is selected.

  The frequency spectrum formed by the transmission signal of the base station apparatus according to the seventh embodiment is the same as that of the sixth embodiment.

  FIG. 15 is a flowchart showing operations related to retransmission radio resource control of the base station apparatus according to the seventh embodiment. As described above, in the downlink, control is performed based on the reception status notification obtained from the mobile station apparatus. First, retransmission request data and reception status information are received from the mobile station apparatus (step Q1). Here, based on the reception status information, it is determined whether or not the reception status deteriorates during retransmission (step Q2). If it is determined in step Q2 that it is degraded, the process proceeds to step Q3, where the modulation multi-value number and / or coding rate is reduced, the number of repetitions is reduced, and the chip length is increased as the radio resource at the next retransmission assign. On the other hand, if it is determined in step Q2 that there is no deterioration, the process proceeds to step Q4, and the radio resource that is not changed or only the phase sequence is changed is assigned to the radio resource at the next retransmission. Next, radio resource control information is notified to the mobile station apparatus using the control channel (step Q5). Next, the retransmission data signal generated using the radio resource set using the data channel is transmitted (step Q6).

  Next, retransmission in the uplink will be described.

  FIG. 16 is a block diagram illustrating a schematic configuration of the base station apparatus of the seventh embodiment. Compared to the configuration of the base station apparatus shown in FIG. The demodulation unit 20 outputs a part of the data signal for measuring the reception status to the reception status measurement unit 25. For example, the reception situation can be measured from a pilot signal for propagation path compensation, and the demodulation unit 20 outputs the received pilot signal to the reception situation measurement unit 25. The reception status measurement unit 25 measures the reception status based on the signal input from the demodulation unit 20. Then, the reception status measuring unit 25 outputs the measurement result to the retransmission radio resource control unit 4.

  When the retransmission radio resource control unit 4 determines from the reception status information measured by the reception status measurement unit 25 that the reception status deteriorates at the next retransmission, the modulation multi-level number and / or coding rate used at the previous transmission is determined. Then, the number of repetitions is selected to be a small value and the chip length is set to a large value, and retransmission radio resource control information is output to the transmitter 2. If it is not determined that the reception status at the next retransmission is deteriorated, a radio resource similar to that at the previous transmission is selected or a radio resource in which only the phase sequence is changed is selected.

  FIG. 17 is a flowchart illustrating retransmission in the uplink according to the seventh embodiment. First, the base station apparatus receives data from the mobile station apparatus, detects an error based on the received data, and estimates the reception status (step T1). Next, it is determined whether or not the estimated reception status is deteriorated (step T2). If it is deteriorated, the modulation multi-value number and / or coding rate is lowered to reduce the number of repetitions, and the chip length is reduced. Increase (step T3). On the other hand, if the reception state does not deteriorate in step T2, nothing is changed or only the phase sequence is changed (step T4). Then, the radio resource control information is notified to the mobile station device (step T5).

  As described above, according to the seventh embodiment, when it is estimated that the reception status at the time of retransmission is deteriorated, the modulation multi-value number, the coding rate, and the number of repetition times used at the time of initial transmission are smaller. Select the modulation multi-value number, coding rate, and number of repetitions, and select a chip length that is larger than the chip length used at the time of initial transmission to generate retransmission radio resource control information. Can be appropriately controlled to avoid a decrease in throughput. In order to estimate the reception status at the time of retransmission, in the case of retransmission on the downlink, the reception status measurement unit provided in the mobile station device measures the reception status and transmits the measurement result to the base station device. In the case of uplink retransmission, the reception status is measured by a reception status measurement unit provided in the base station apparatus.

(Eighth embodiment)
The base station apparatus according to the eighth embodiment assigns a phase sequence preferentially to a mobile station apparatus that performs retransmission, and then assigns a phase sequence to a mobile station apparatus that performs normal transmission. Thereby, it is possible to easily assign a desired phase sequence to a mobile station apparatus that performs retransmission.

  The configuration of the transmission unit of the base station apparatus according to the eighth embodiment is the same as that of the first embodiment shown in FIG. 1 and FIG. Further, the eighth embodiment can be applied to both the downlink and the uplink. Here, a description will be given taking retransmission in the downlink as an example.

  The transmission control unit 7 preferentially assigns a phase sequence to a mobile station apparatus that performs retransmission, and outputs control information related to retransmission parameters to each block for the mobile station apparatus that performs retransmission, so that the mobile station apparatus performs normal transmission. For the station apparatus, control information related to normal transmission parameters is output to each block.

  FIG. 18 is a flowchart showing operations related to radio resource allocation control including normal transmission and retransmission of the base station apparatus according to the eighth embodiment. First, a phase sequence is assigned to retransmission data (step R1). Here, it is determined whether or not the phase sequence has been assigned to all the retransmission data (step R2). If the phase sequence has not been assigned to all the retransmission data, the process proceeds to step R1. On the other hand, when the phase sequence has been assigned to all the retransmission data, the phase sequence is assigned to the normal transmission data (step R3). Here, it is determined whether or not the phase sequence has been assigned to all the normal transmission data (step R4). If the phase sequence has not been assigned to all the normal transmission data, the process proceeds to step R3. On the other hand, when the phase sequence has been assigned to all normal transmission data, the process is terminated.

  As described above, according to the eighth embodiment, a phase sequence is preferentially assigned to a communication partner that needs to be retransmitted, and then a phase sequence is assigned to a communication partner that performs normal transmission. Therefore, it is possible to easily assign a desired phase sequence to a communication partner that needs to be retransmitted.

(Ninth embodiment)
The mobile station apparatus which concerns on 9th Embodiment notifies the information which concerns on resending in the base station apparatus which concerns on the said 1st-8th embodiment. Thereby, the base station apparatus which concerns on the said 1st-8th embodiment can perform the retransmission control of this invention.

  FIG. 19 is a block diagram illustrating a schematic configuration of a mobile station apparatus according to the ninth embodiment, and illustrates a block used when performing retransmission in the downlink. The mobile station apparatus 170 includes a receiving unit 171 and a transmitting unit 172. In the reception unit 171, the reception control unit 173 controls parameters of each block of the reception unit 171, and outputs control information related to parameters set in each block, in other words, parameters used in the transmission unit 172. Here, the radio resource control information regarding the parameters of each block is notified from the base station apparatus using the control channel prior to the reception of the data signal.

  When retransmission is performed using a different phase sequence, the phase sequence information is included in the radio resource control information and notified in advance from the base station apparatus, and the reception control unit 173 performs reception processing suitable for the retransmitted signal. In order to do so, the parameter that has been notified from the base station apparatus to the phase multiplier 175 and that has been changed so far is output. Further, when retransmission is performed using different modulation multilevel numbers or / and coding rates, repetition counts, and chip lengths, the information is included in the radio resource control information and notified in advance from the base station apparatus. The control unit 173 outputs the parameter that has been notified to each block from the base station apparatus and that has been changed.

  The wireless unit 174 receives a data signal via the transmission / reception antenna 169 and converts the analog wireless signal into a digital baseband signal. The phase multiplier 175 multiplies the digital baseband signal by the phase sequence input from the reception control unit 173, and returns the phase of the data signal multiplied by the transmitter 172 to the original phase again. The chip repetition synthesizer 176 re-synthesizes the data signal subjected to the chip repetition input from the phase multiplier with the number of repetitions and the chip length input from the reception controller 173. The despreading unit 177 performs despreading by multiplying the data signal synthesized by chip repetition using the spreading code input from the reception control unit 173. Demodulation section 178 demodulates the despread data signal using the modulation method input from reception control section 173. Further, when retransmission is performed, demodulating section 178 outputs the demodulated data signal to packet combining section 179 in order to combine an erroneous data signal and retransmission signal.

  In the case combining method, there are a method of combining with a symbol sequence before demapping and a method of combining with a bit sequence after demapping, so that a demodulated data signal is output to the packet combining unit 179 according to the method used. To do. In the incremental redundancy method, the demapped bit sequence is output to the packet combining unit 179.

  Channel decoding section 180 performs channel decoding on the demodulated data signal at the coding rate input from reception control section 173. When the incremental redundancy method is used as the packet combining method, or when the retransmission data signal is retransmitted after changing the coding rate, a parameter different from the erroneous data signal is input to the channel decoding unit 180, and the parameter The channel decoding according to is performed. The error detection unit 181 detects an error in the binary data signal input from the channel decoding unit, and outputs the result to the packet synthesis unit 179 and the transmission unit 172. If no error is detected, a binary data signal is sent to the upper layer, and if an error is detected, the channel-decoded binary data signal is discarded. When the upper limit of the number of retransmissions is reached, even if an error is detected, a binary data signal is sent to the upper layer.

  The packet combiner 179 temporarily stores the data signal input from the demodulator 178, combines it with the retransmitted data signal, and then outputs the combined data signal to the channel decoder 180. In the case combining method, the packet combining unit 179 performs weighted combining (maximum ratio combining) on the data signal using the estimated coefficient of the propagation path fluctuation value, and performs demapping and combining the data signal into the bit sequence when combining with the symbol sequence. After conversion, the data is output to the channel decoding unit 180. When the bit sequence is combined, the weighted data signal is output to the channel decoding unit 180 as it is. In the incremental redundancy method, the packet combining unit 179 outputs the data signal adjusted by rearranging the temporarily stored erroneous data signal and the retransmitted data signal together to the channel decoding unit 180.

  Here, when notified from the error detection unit 181 that no error has been detected, the packet combining unit 179 discards the corresponding temporarily stored data signal.

  When notified from the error detection unit 181 that an error has been detected, the transmission unit 172 uses the modulation scheme, coding rate, chip pattern, number of repetitions, phase used for the reception processing of the data signal in which the error has been detected. Retransmission request data including a sequence and retransmission request information (NACK) is generated and transmitted to the base station apparatus. Also, when notified from the error detection unit 181 that an error has not been detected, the transmission unit 172 transmits reception completion information (ACK) to the base station apparatus.

  In the ninth embodiment, basically, in the base station apparatus, the number of modulation multilevels and / or the coding rate is decreased, the number of repetitions is decreased, the chip length is increased, and the retransmission data signal is transmitted. In this case, the erroneous data signal is discarded, and the packet combining unit 179 performs reception processing alone without combining the retransmission data signal.

  More specifically, the ARQ method is used as a retransmission method when the transmission rate is significantly changed or the coding rate is changed. However, the packet combining that combines the erroneous data signal and the retransmitted data signal is applied to the case of performing retransmission at the same transmission rate as the erroneous data signal in the sixth and seventh embodiments. A configuration using a part or the incremental redundancy method may be used. Also, in this case, since different modulation schemes are used for the retransmitted data signal, the number of symbols in one packet is different, and synthesis with symbol sequences cannot be performed. Therefore, the case combining method is weighted with bit sequences with the same number after demapping. Perform synthesis. For example, if the modulation method of the erroneous data signal is QPSK, the modulation method of the retransmission data signal is set to BPSK, which is a modulation rate ½ of QPSK, and the frequency spectrum to be used is doubled, the number of symbols is the retransmission data. The signal is twice that of the erroneous data signal, but the number of bits after demapping is equal.

  This method is assumed to be used in a system with a fixed symbol length. The Incremental Redundancy method can also be applied when the transmission rate is the same and the coding rate is not changed, and the data signal adjusted by rearranging the incorrect data signal and the retransmitted data signal is output to the channel decoding unit 180. . Also, when the retransmission multi-value number is reduced, the number of repetitions is reduced, the chip length is increased, and the retransmission data signal of the erroneous data signal is generated, the transmission speed is not exactly the same and there is a slight margin In addition, in order to perform weighted synthesis in a bit sequence, it is possible to adopt a configuration in which transmission data is matched and retransmission is performed by inserting redundant data such as zero padding. For example, when the modulation scheme of the erroneous data signal is QPSK, the retransmission data signal modulation scheme is set to BPSK, which is a modulation rate ½ of QPSK, and the frequency spectrum to be used is further multiplied by 2.2. Then, it is possible to transmit 1/2 × 2.2 = 1.1 times the information data compared to the erroneous data signal. Here, in order to reduce the complexity of the reception unit that performs packet combining due to the difference in the data amount, redundant data is inserted into the surplus 0.1 times to match the data amount.

  Furthermore, when communicating with the base station apparatus of the seventh embodiment, the mobile station apparatus needs to notify the base station apparatus of reception status information. FIG. 20 shows the configuration of the mobile station apparatus in that case.

  FIG. 20 is a block diagram illustrating a schematic configuration of a mobile station apparatus that communicates with the base station apparatus of the seventh embodiment. Compared to the configuration of the mobile station apparatus shown in FIG. 19, a reception status measurement unit 185 is further provided. Demodulation section 178 outputs a part of the data signal for measuring the reception status to reception status measurement section 185. For example, the reception status can be measured from a pilot signal for channel compensation, and the demodulation unit 178 outputs the received pilot signal to the reception status measurement unit 185.

  The reception status measurement unit 185 measures the reception status based on the signal input from the demodulation unit 178. Here, the reception status measurement unit 185 outputs a measurement result or an index for determining whether or not the reception status deteriorates in the base station apparatus to the transmission unit 172. When the error detection unit 181 detects an error, the transmission unit 172 transmits the result of the reception status measurement unit 185 together with the retransmission request data to the base station apparatus.

  FIG. 21 is a block diagram illustrating a schematic configuration of a mobile station apparatus according to the ninth embodiment, and illustrates a block used when performing retransmission in the uplink. In the case of uplink, the mobile station apparatus performs all the processes related to retransmission, such as measurement of reception status, in the base station apparatus, and the result is notified to the mobile station apparatus, so that the mobile station apparatus follows the notified information. Send.

  In FIG. 21, the transmission control unit 190 controls the parameters of each block of the transmission unit 172, and outputs control information related to the parameters set in each block. Channel coding section 191 performs channel coding on the data signal sent from the upper layer at the coding rate input from transmission control section 190. Modulation section 192 modulates the channel encoded data signal using the modulation scheme input from transmission control section 190. Spreading section 193 performs spreading by multiplying the modulated data signal by the spread code input from transmission control section 190.

  The chip repetition unit 194 sorts the spread data signals by the chip length (Q chip) input from the transmission control unit 190, and similarly, the repetition number (CRF number) input from the transmission control unit 190 is Q. It repeats with a chip as a cycle. The phase multiplication unit 195 multiplies the chip repetition data signal by the phase sequence with the phase sequence input from the transmission control unit 190. The wireless unit 196 converts the data signal input from the phase multiplying unit 195 into a wireless signal, and transmits the data signal via the transmission / reception antenna 169.

  As described above, according to the ninth embodiment, since retransmission request data is transmitted to any of the above-described base station apparatuses, the base station apparatus that has received the retransmission request data performs the above retransmission control. It becomes possible. Further, since the retransmission request data and the reception status at the time of retransmission estimated by the reception status estimation unit are transmitted to the base station device, the base station device that has received the retransmission request data and the estimated reception status at the time of retransmission The above retransmission control can be performed.

It is a block diagram which shows schematic structure of the base station apparatus which concerns on 1st Embodiment. It is a block diagram which shows schematic structure of the base station apparatus which concerns on 1st Embodiment. It is a figure which shows an example of the frequency spectrum which the transmission signal of the base station apparatus which concerns on 2nd Embodiment forms. It is a flowchart which shows the operation | movement regarding the resending radio | wireless resource control of the base station apparatus which concerns on 2nd Embodiment. It is a figure which shows an example of the frequency spectrum which the transmission signal of the base station apparatus which concerns on 3rd Embodiment forms. It is a flowchart which shows the operation | movement regarding the resending radio | wireless resource control of the base station apparatus which concerns on 3rd Embodiment. It is a figure which shows an example of the frequency spectrum formed when the transmission signal of the base station apparatus which concerns on 4th Embodiment performs resending twice. It is a flowchart which shows the operation | movement regarding the resending radio | wireless resource control of the base station apparatus which concerns on 4th Embodiment. It is a figure which shows an example of the frequency spectrum which the transmission signal of the base station apparatus which concerns on 5th Embodiment forms. It is a flowchart which shows the operation | movement regarding the resending radio | wireless resource control of the base station apparatus which concerns on 5th Embodiment. It is a flowchart which shows the operation | movement regarding the resending radio | wireless resource control of the base station apparatus which concerns on 5th Embodiment. It is a figure which shows an example of the frequency spectrum which the transmission signal of the base station apparatus which concerns on 6th Embodiment forms. It is a flowchart which shows the operation | movement regarding the resending radio | wireless resource control of the base station apparatus which concerns on 6th Embodiment. It is a flowchart which shows the resending in the uplink in 6th Embodiment. It is a flowchart which shows the operation | movement regarding the resending radio | wireless resource control of the base station apparatus which concerns on 7th Embodiment. It is a block diagram which shows schematic structure of the base station apparatus of 7th Embodiment. It is a flowchart which shows the resending in the uplink in 7th Embodiment. It is a flowchart which shows the operation | movement regarding the radio | wireless resource allocation control including normal transmission and retransmission of the base station apparatus which concerns on 8th Embodiment. It is a block diagram which shows schematic structure of the mobile station apparatus which concerns on 9th Embodiment. It is a block diagram which shows schematic structure of the mobile station apparatus which communicates with the base station apparatus of 7th Embodiment. It is a block diagram which shows schematic structure of the mobile station apparatus which concerns on 9th Embodiment. 2 is a block diagram illustrating a schematic configuration of a transmission unit of a wireless communication system A. FIG. 6 is a diagram illustrating main operations of the wireless communication system A. FIG. It is a figure which shows an example of the frequency spectrum which a transmission signal forms. It is a figure which shows the change of the frequency spectrum at the time of changing distribution of Q and CRF, keeping (QxCRF) constant. 2 is a block diagram showing a schematic configuration of a receiving unit of a wireless communication system A. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base station apparatus 2 Transmission part 3 Reception part 4 Retransmission radio | wireless resource control part 7 Transmission control part 21 Packet composition part 23 Error detection part 25 Reception condition measurement part 170 Mobile station apparatus 171 Reception part 172 Transmission part 173 Reception control part 179 Packet composition 181 Error detection unit 185 Reception status measurement unit

Claims (11)

A communication control device for retransmitting data to the communication partner when receiving retransmission request information for requesting retransmission of data from the communication partner;
Based on the received retransmission request information , a retransmission radio resource control unit that includes at least a phase sequence and generates radio resource control information used at the time of data retransmission ;
A transmission control unit that inputs radio resource control information generated by the retransmission radio resource control unit and outputs control information related to radio parameters;
A radio transmission unit that transmits the radio resource control information and retransmission data to the communication partner based on the control information output from the transmission control unit ;
The retransmission radio resource control unit detects a position on the frequency axis that is farthest from the frequency spectrum constituting the phase sequence assigned at the time of initial transmission by the transmission control unit, and a frequency spectrum is formed at the detected position. A communication control apparatus that generates radio resource control information by selecting a phase sequence to be transmitted . A communication control device that requests retransmission of data to the communication partner when an error in data received from the communication partner is detected,
Based on the received data, a retransmission radio resource control unit that includes at least a phase sequence and generates radio resource control information used by the communication partner during data retransmission ;
A transmission control unit that outputs control information related to radio parameters;
On the basis of the control information outputted from the transmission control unit, to said communication partner, and a radio transmitting unit that transmits the retransmission request requesting to retransmit the radio resource control information and data the generated ,
The retransmission radio resource control unit detects a position on the frequency axis that is farthest from the frequency spectrum constituting the phase sequence assigned at the time of initial transmission by the transmission control unit, and a frequency spectrum is formed at the detected position. A communication control apparatus that generates radio resource control information by selecting a phase sequence to be transmitted . The retransmission radio resource control unit detects, on the frequency axis, a position having the smallest sum of squares of distances from adjacent frequency spectrums among the frequency spectrums constituting the phase sequence assigned at the time of initial transmission by the transmission control unit. the communication control apparatus according to claim 1 or claim 2, wherein that. A communication control device for retransmitting data to the communication partner when receiving retransmission request information for requesting retransmission of data from the communication partner;
Based on the received retransmission request information, a retransmission radio resource control unit that includes at least a phase sequence and generates radio resource control information used at the time of data retransmission;
A transmission control unit that inputs radio resource control information generated by the retransmission radio resource control unit and outputs control information related to radio parameters;
A radio transmission unit that transmits the radio resource control information and retransmission data to the communication partner based on the control information output from the transmission control unit;
The retransmission radio resource control unit is the furthest away from the frequency spectrum constituting the phase sequence allocated at the time of initial transmission and the previous retransmission by the transmission control unit on the frequency axis when the retransmission becomes the second or more times. A communication control apparatus that detects a position and generates radio resource control information by selecting a phase sequence in which a frequency spectrum is formed at the detected position . A communication control device that requests retransmission of data to the communication partner when an error in data received from the communication partner is detected,
Based on the received data, a retransmission radio resource control unit that includes at least a phase sequence and generates radio resource control information used by the communication partner during data retransmission;
A transmission control unit that outputs control information related to radio parameters;
A wireless transmission unit that transmits the generated radio resource control information and retransmission request information for requesting retransmission of data to the communication partner based on the control information output from the transmission control unit. ,
The retransmission radio resource control unit is the furthest away from the frequency spectrum constituting the phase sequence allocated at the time of initial transmission and the previous retransmission by the transmission control unit on the frequency axis when the retransmission becomes the second or more times. A communication control apparatus that detects a position and generates radio resource control information by selecting a phase sequence in which a frequency spectrum is formed at the detected position . The retransmission radio resource control unit specifies a position on the frequency axis that has the largest sum of distances from a frequency spectrum constituting a phase sequence assigned by the transmission control unit at the time of initial transmission and retransmission up to the previous time , 6. The communication control apparatus according to claim 4, wherein a position where the sum of squares of the distance from the specified position is the smallest is detected . The transmission control unit preferentially assigns a phase sequence to a communication partner that needs retransmission, and then assigns a phase sequence to a communication partner that performs normal transmission. The communication control device according to claim 6. A communication terminal device that requests retransmission of data to the communication partner when detecting an error in data received from the communication partner,
Retransmission request information for requesting retransmission of data, a retransmission request data generating unit for generating retransmission request data including at least a phase sequence of data in which an error has occurred,
A communication terminal device comprising: a wireless transmission unit that transmits the retransmission request data generated by the retransmission request data generation unit to the communication control device according to any one of claims 1 to 7. A base station apparatus comprising the communication control apparatus according to claim 1. A mobile station apparatus comprising the communication terminal apparatus according to claim 8. A radio communication system comprising the base station apparatus according to claim 9 and the mobile station apparatus according to claim 10.

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