WO2006046586A1 - データ通信装置、データ受信装置、データ送信装置および再送制御方法 - Google Patents
データ通信装置、データ受信装置、データ送信装置および再送制御方法 Download PDFInfo
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- WO2006046586A1 WO2006046586A1 PCT/JP2005/019660 JP2005019660W WO2006046586A1 WO 2006046586 A1 WO2006046586 A1 WO 2006046586A1 JP 2005019660 W JP2005019660 W JP 2005019660W WO 2006046586 A1 WO2006046586 A1 WO 2006046586A1
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- error rate
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/04—Error control
Definitions
- Data communication apparatus data receiving apparatus, data transmitting apparatus, and retransmission control method
- the present invention relates to a data communication device, a data reception device, a data transmission device, and a retransmission control method.
- ARQ Automatic Repeat reQuest
- the receiving side determines the presence or absence of a bit error in the received packet, and if an error is detected, a NACK signal (negative acknowledgment signal) is fed back to the transmitting side as a retransmission request signal, and if no error is detected.
- ACK signal (acknowledgment signal) is fed back to the transmitter.
- the transmitting side When the transmitting side receives a NACK signal (or when it does not receive an ACK signal), it retransmits the previously transmitted packet (for example, see Non-Patent Document 1).
- the maximum number of retransmissions that is, the maximum number of retransmissions is set.
- One method for setting the maximum number of retransmissions is to set the number of retransmissions according to the channel quality (for example, Patent Document 1).
- the generic term for ACK and NACK signals is defined as “response signal”.
- Patent Document 1 JP-A-1-54839
- Non-Patent Document 1 "Mobile Communication”, Shuichi Sasaoka, Ohmsha, pp. 236-237
- An object of the present invention is to provide a data communication device, a data reception device, a data transmission device, and a retransmission control method that can improve transmission efficiency.
- the data communication device of the present invention is acquired as a result of comparison by an acquisition means for acquiring a data reception error rate, a comparison means for comparing the acquired reception error rate and a target value, and the comparison means. If the reception error rate is lower than the target value, a configuration is employed that includes processing means for performing processing to avoid data retransmission.
- the retransmission control method of the present invention includes an acquisition step of acquiring a data reception error rate, a comparison step of comparing the acquired reception error rate with a target value, and a result of comparison in the comparison step, And a processing step for performing processing to avoid data retransmission when the obtained reception error rate is lower than the target value.
- FIG. 1 is a block diagram showing a configuration of a mobile station according to Embodiment 1 of the present invention.
- FIG. 2 is a flowchart for explaining a response signal generation operation according to the first embodiment of the present invention.
- FIG. 3 is a diagram for explaining a transmission / reception operation according to the first embodiment of the present invention.
- FIG. 4 is a block diagram showing a configuration of a mobile station according to Embodiment 2 of the present invention.
- FIG. 5 is a diagram showing a correspondence relationship between SIR and BER according to Embodiment 2 of the present invention.
- FIG. 6 is a flowchart for explaining a response signal generation operation according to the second embodiment of the present invention.
- FIG. 7 is a block diagram showing the configuration of a base station according to Embodiment 3 of the present invention.
- FIG. 8 is a flowchart for explaining retransmission determination operation according to Embodiment 3 of the present invention.
- FIG. 9 is a diagram for explaining a transmission / reception operation according to the third embodiment of the present invention.
- FIG. 10 is a block diagram showing a configuration of a base station according to Embodiment 4 of the present invention.
- FIG. 11 is a diagram showing a correspondence relationship between SIR and erroneous determination rate according to Embodiment 4 of the present invention.
- FIG. 12 is a block diagram showing a configuration of a base station according to Embodiment 5 of the present invention.
- FIG. 13 is a block diagram showing a configuration of a base station according to Embodiment 6 of the present invention.
- FIG. 14 is a flowchart for explaining a transmission determination operation according to the sixth embodiment of the present invention.
- FIG. 15 is a diagram for explaining a transmission / reception operation according to the sixth embodiment of the present invention.
- FIG. 1 is a block diagram showing a configuration of a mobile station apparatus (hereinafter abbreviated as “mobile station”) provided with the data communication apparatus according to Embodiment 1 of the present invention.
- Mobile station 100 of the present embodiment is used as a data receiving device, and receives packet data transmitted from a base station device (hereinafter abbreviated as “base station”) as a data transmitting device.
- base station a base station device
- a NACK signal is transmitted when a retransmission request is received for received packet data
- an ACK signal is transmitted when a retransmission request is not requested.
- Mobile station 100 includes antenna 102, reception radio processing section 104, signal separation section 106, channel estimation section 108, demodulation sections 110 and 112, decoding sections 114 and 116, error detection section 118, error rate measurement section 120, It has an ACKZNACK generation unit 122, code key units 124 and 126, modulation units 128 and 130, a multiplexing unit 132, and a transmission radio processing unit 134.
- Reception radio processing section 104 receives a signal transmitted from the base station via antenna 102. Then, predetermined reception radio processing (for example, down-conversion, AZD conversion, etc.) is performed on the received signal. The reception signal that has undergone reception radio processing is output to the signal separation unit 106.
- predetermined reception radio processing for example, down-conversion, AZD conversion, etc.
- the signal demultiplexing unit 106 demultiplexes the control channel, the data channel, and the pilot channel that are multiplexed in the received signal by, for example, code multiplexing, time multiplexing, or frequency multiplexing.
- the control information of the control channel is sent to the demodulator 110, the data signal of the data channel is sent to the demodulator 112, and the pilot signal of the pilot channel is sent to the channel estimator 1 Output to 08 respectively.
- Channel estimation section 108 performs channel estimation using the input pilot signal.
- Decoding section 110 demodulates the control information based on the channel estimation result.
- the demodulator 112 demodulates the data signal based on the channel estimation result.
- Decoding section 114 decodes the demodulated control information.
- Decoding section 116 decodes the demodulated data signal. The decoded data signal is output as received data.
- Error detection section 118 performs error detection processing by CRC (Cyclic Redundancy Check), that is, detects errors in the received data decoded by decoding section 116 in units of frames. Then, the result of error detection processing (hereinafter referred to as “CRC result”) is notified to the error rate measurement unit 120 and the AC KZNACK generation unit 122.
- CRC Cyclic Redundancy Check
- the error rate measurement unit 120 acquires a reception error rate as an acquisition unit. Further, the error rate measuring unit 120 measures the PER in a predetermined packet error rate (PER) measurement period (for example, N frames) based on the CRC result. Hereinafter, the measured PER is abbreviated as measured PER. The measured PER is output to the ACKZNACK generator 122.
- PER packet error rate
- the ACKZNACK generation unit 122 acquires required PER information indicating the required PER among the control information decoded by the decoding unit 114.
- the required PER functions as a target value for the measured PER.
- the ACKZNACK generation unit 122 generates either an ACK signal or a NACK signal based on the measured PER, the required PER, and the CRC result, and outputs the generated signal to the encoding unit 124. Details of the generation operation of the ACK signal and the NACK signal will be described later.
- the data communication apparatus includes an error rate measurement unit 120 and an ACKZNAC K generation unit 122.
- the code key unit 124 encodes the input ACK signal or NACK signal.
- the encoding unit 126 encodes transmission data.
- Modulating section 128 modulates the ACK signal or NACK signal encoded by encoding section 124.
- Modulating section 130 modulates the transmission data encoded by encoding section 126.
- the multiplexing unit 132 multiplexes the modulated ACK signal or NACK signal and the modulated transmission data by a multiplexing method such as code multiplexing, time multiplexing, or frequency multiplexing.
- the transmission radio processing unit 134 performs predetermined processing on the multiplexed signal.
- the transmission wireless processing (for example, DZA conversion, up-conversion, etc.) is performed and transmitted to the base station via the antenna 102.
- FIG. 2 is a flowchart for explaining the response signal generation operation of the ACKZNACK generation unit 122.
- step ST1000 it is determined based on the CRC result whether or not a received data error is detected. If an error is detected as a result of this determination processing (ST1000: YES), the process proceeds to step ST1100. If no error is detected (ST1000: NO), the process proceeds to step ST1400.
- step ST1100 as a comparison means, the measured PER is compared with the required PER. As a result of this comparison, if the measured PER is lower than the required PER (ST1100: YES), go to step ST1200 and if the measured PER is equal to the required PER or if the measured PER is higher than the required PER (ST1100: NO), go to step ST1300.
- step ST1200 processing for avoiding data retransmission of the base station is performed as processing means. Specifically, an ACK signal is generated as request means and output to encoding section 124. As a result, even when an error is detected in the received data, an ACK signal is transmitted from the mobile station 100 to the base station in a situation where the transmission quality is excessively good.
- step ST1300 a NACK signal is generated as a request means, and output to encoding section 124.
- step ST1400 an ACK signal is generated as a request means and output to encoding section 124.
- steps ST1000 and ST1100 may be reversed.
- FIG. 3 is a diagram for explaining the transmission / reception operation of the mobile station 100.
- the PER measurement period is set to 10 frames.
- the required PER is set to 0.15.
- ⁇ indicates that no error was detected in the received data during the error detection process
- X indicates that an error in the received data was detected during the error detection process.
- new packet data of frame # 1 is transmitted from the base station. Receive. Since no error is detected in the received data, the mobile station 100 feeds back an ACK signal to the base station. The base station receiving the ACK signal transmits new packet data of frame # 2. In this example, the above operation is repeated until frame # 9.
- the measurement PER is transmitted to the mobile station 100 that transmits either the ACK signal or the NACK signal depending on the error detection result of the received packet data. If the measured PER is lower than the required PER, processing to avoid packet data retransmission is performed, so that the base station can perform retransmission only when the measured PER is less than the required PER, and excessive retransmission can be avoided. Transmission efficiency can be improved.
- a mobile station that generates and transmits a NACK signal has been described as an example.
- the present invention can also be applied to a mobile station that does not generate a NACK signal.
- the measured PER is greater than the required PER
- nothing is sent as a response signal.
- the same effect as described above can be realized in a mobile station that transmits an ACK signal when no error is detected and transmits nothing when an error is detected.
- the present invention can also be applied to a mobile station that does not generate an ACK signal.
- a mobile station that does not generate an ACK signal.
- the measured PER is lower than the required PER
- nothing is transmitted as a response signal.
- a NACK signal is transmitted when an error is detected, and nothing is transmitted when no error is detected! It is possible for a mobile station to achieve the same effects as described above.
- the mobile station is used as a data reception device and the base station is used as a data transmission device
- the mobile station is used as a data transmission device.
- the present invention is also applicable when the base station is used as a data receiving device. Can be used.
- FIG. 4 is a block diagram showing a configuration of a mobile station provided with the data communication apparatus according to Embodiment 2 of the present invention.
- mobile station 200 of the present embodiment is used as a data receiving device, and receives packet data transmitted from a base station as a data transmitting device.
- Mobile station 200 has the same basic configuration as mobile station 100 described in Embodiment 1, and the same components as those described in Embodiment 1 are denoted by the same reference numerals, and Detailed description is omitted.
- Mobile station 200 adds reception quality measurement section 202 to the configuration of mobile station 100, and further, error rate measurement section 204 and ACKZNACK instead of error rate measurement section 120 and ACKZNACK generation section 122 of mobile station 100
- the generation unit 206 is provided.
- Reception quality measuring section 202 measures a reception SIR (Signal to Interference Ratio) as the channel quality of the data channel.
- the average value of received SIR (average received SIR) during the measurement period (eg, N frames) is calculated.
- the calculated average received SIR is output to error rate measuring section 204.
- the error rate measurement unit 204 measures the BER by estimating the bit error rate (BER) from the average received SIR.
- the measured BER is abbreviated as measured BER.
- the measurement BER is output to the ACKZNACK generation unit 206.
- the combination of the reception quality measurement unit 202 and the error rate measurement unit 204 acquires the reception error rate as an acquisition unit.
- the above BER estimation is performed based on the correspondence between the average received SIR and the BER.
- This correspondence is stored in advance in the error rate measurement unit 204. For example, assume that the correspondence shown in Fig. 5 is stored. In this case, if the average received SIR value is 8 dB, 0.03 is output as the BER value.
- the ACKZNACK generation unit 206 acquires the required BER information indicating the required BER among the control information decoded by the decoding unit 114.
- the required BER functions as a target value for the measured BER.
- ACKZNACK generating section 206 generates either an ACK signal or a NACK signal based on the measured BER, the required BER, and the CRC result, and outputs the generated ACK signal or NACK signal to encoding section 124. Details of the ACK and NACK signal generation operations will be described later. explain.
- the data communication apparatus includes a reception quality measurement unit 202 and an error rate measurement unit 20.
- FIG. 5 is a flowchart for explaining a response signal generation operation of an ACKZNACK generation unit 206
- step ST1000 If an error is detected as a result of the determination process in step ST1000 described above (ST1000:
- step ST1110 If no error is detected (ST1000: NO), go to step ST1400 described above.
- step STl 110 as a comparison means, the measured BER is compared with the required BER. As a result of this comparison, if the measured BER is lower than the required BER (ST1110: YES), proceed to step ST1200 described above, if the measured BER is equal to the required BER, or if the measured BER is higher than the required BER, In the case (STl 110: NO), the process proceeds to the above-described step ST1300.
- steps ST1000 and STl110 may be reversed.
- the ACK signal or the NACK signal is determined according to the error detection result of the received packet data.
- the mobile station 200 that transmits the error performs processing to avoid packet data retransmission. Therefore, only when the measured BER is less than the required BER, The station can be retransmitted, excessive retransmission can be avoided, and transmission efficiency can be improved.
- BER can be estimated with high accuracy even in a relatively short measurement period compared to PER, so that it is possible to improve the follow-up capability of retransmission control to fluctuations in the reception error rate.
- a mobile station that generates and transmits a NACK signal has been described as an example.
- the present invention can also be applied to a mobile station that does not generate a NACK signal. In this case, when an error is detected and the measured BER is higher than the required BER, nothing is transmitted as a response signal. As a result, the same effect as described above can be realized in a mobile station that transmits an ACK signal when no error is detected and transmits nothing when an error is detected.
- the present invention can also be applied to a mobile station that does not generate an ACK signal. In this case, when no error is detected or when an error is detected and the measured BER is lower than the required BER, nothing is transmitted as a response signal. As a result, a NACK signal is transmitted when an error is detected, and nothing is transmitted when no error is detected! It is possible for a mobile station to achieve the same effects as described above.
- the present invention can also be applied when a mobile station is used as a data transmission device and a base station is used as a data reception device.
- FIG. 7 is a block diagram showing a configuration of a base station provided with the data communication apparatus according to Embodiment 3 of the present invention.
- Base station 300 of the present embodiment is used as a data transmission device, and transmits packet data to a mobile station as a data reception device.
- Base station 300 includes antenna 302, reception radio processing section 304, signal separation section 306, channel estimation section 308, demodulation sections 310 and 312, decoding sections 314 and 316, error rate measurement section 318, retransmission determination section 320, Retransmission control unit 322, code key units 324 and 326, modulation units 328 and 330, multiplexing unit 332, and transmission radio processing unit 334 are included.
- Reception radio processing section 304 receives a signal transmitted from a mobile station via antenna 302. Then, predetermined reception radio processing (for example, down-conversion, AZD conversion, etc.) is performed on the received signal. The received signal that has been subjected to the reception radio processing is output to the signal separation unit 306.
- predetermined reception radio processing for example, down-conversion, AZD conversion, etc.
- the signal demultiplexing unit 306 demultiplexes the control channel, the data channel, and the pilot channel that are multiplexed in the received signal by, for example, code multiplexing, time multiplexing, or frequency multiplexing.
- the control channel control information is output to demodulation section 310, the data channel data signal is output to demodulation section 312 and the pilot channel pilot signal is output to channel estimation section 308.
- Channel estimation section 308 performs channel estimation using the input pilot signal.
- Decoding section 310 demodulates the data signal based on the channel estimation result.
- Demodulator 312 Then, the control information is demodulated based on the channel estimation result.
- the decoding unit 314 decodes the demodulated data signal.
- the decoded data signal is output as received data.
- Decoding section 316 decodes the demodulated control information.
- Error rate measuring section 318 acquires the reception error rate of the mobile station as an acquisition means. Specifically, the PER of the mobile station is measured using the ACK signal and the NA CK signal to which the mobile station power is also fed back among the decoded control information. The measured PER is output to retransmission decision section 320.
- Retransmission determination section 320 receives a required PER notification from the radio network control station. Also, the ACK signal and NACK signal fed back from the mobile station are acquired from the decoded control information. Also, retransmission determination section 320 performs retransmission determination based on measured PER, required PER, and ACK signal ZNACK signal, and instructs retransmission control section 322 to execute either new packet transmission or packet retransmission. In addition, when the number of retransmissions of a certain packet data exceeds a predetermined value (maximum number of retransmissions), the packet data is not retransmitted. The maximum number of retransmissions is predetermined by the radio network control station based on the allowable delay amount. Also, the result of retransmission determination is notified to the code key unit 324. Details of the retransmission determination operation will be described later.
- the data communication apparatus includes error rate measurement section 318 and retransmission determination section 320.
- Retransmission control section 322 stores transmission data. Then, when packet retransmission is instructed from retransmission determination section 320, the stored transmission data is output to encoding section 326 as retransmission packet data. In addition, when the retransmission determination unit 320 is instructed to transmit a new packet, the new packet data is output to the code unit 326.
- the code unit 324 encodes control information corresponding to the retransmission determination result.
- the encoding unit 326 encodes the packet data input from the retransmission control unit 322.
- Modulating section 328 modulates the signal encoded by encoding section 324.
- Modulating section 330 modulates the signal encoded by encoding section 326.
- the multiplexing unit 332 multiplexes the signals modulated by the modulation units 328 and 330 by a multiplexing method such as code multiplexing, time multiplexing, or frequency multiplexing.
- the transmission radio processing unit 334 performs predetermined transmission radio processing (for example, DZA conversion) on the multiplexed signal. Conversion, up-conversion, etc.) and transmitting to the mobile station via the antenna 302.
- Figure 8 shows the retransmission decision unit 32
- FIG. 10 is a flowchart for explaining a retransmission determination operation of 0.
- step ST3000 based on whether the response signal fed back from the mobile station is an ACK signal or a NACK signal, it is determined whether or not an error in received data is detected in the mobile station. As a result of this judgment process, if an error is detected (that is, the NACK signal is fed back) (ST3000: YES), the process proceeds to step ST3100, and no error is detected (that is, the ACK signal is fed back). (ST3000: NO), go to step ST3400.
- step ST3100 as a comparison means, the measured PER is compared with the required PER. If the result of this comparison is that the measured PER is lower than the required PER (ST3100: YES), go to step ST3200 and if the measured PER is equal to the required PER or if the measured PER is higher than the required PER (ST3100: NO), go to step ST3300.
- Step ST3200 processing for avoiding data retransmission to the mobile station is performed as processing means. Specifically, the execution of new packet transmission is determined, and the retransmission control unit 322 is instructed to that effect. Thus, even when an error is detected in the received data at the mobile station, new packet data is transmitted from the base station 300 to the mobile station in a situation where the transmission quality is excessively good.
- step ST3300 execution of packet retransmission is determined, and that is instructed to retransmission control section 322.
- step ST3400 execution of new packet transmission is decided, and this is instructed to retransmission control section 322.
- steps ST3000 and ST3100 may be reversed.
- FIG. 9 is a diagram for explaining the transmission / reception operation of base station 300.
- the PER measurement period is set to 10 frames.
- the required PER is set to 0.15.
- ⁇ indicates that no error was detected in the received data in the error detection process
- X indicates that an error in the received data was detected in the error detection process.
- new packet data of frame # 1 is transmitted from the base station 300, and the mobile station receives it. Since no error is detected in the received data, the mobile station feeds back the A CK signal to the base station 300. Receiving the ACK signal, base station 300 transmits new packet data of frame # 2. In this example, the above operation is repeated until frame # 9.
- the mobile station feeds back a NACK signal to base station 300.
- the measured PER in the PER measurement period is 0.10, which is lower than the required PER. Therefore, the base station 300 does not retransmit the same packet data as the packet data of frame # 10, but transmits new packet data in frame # 11.
- a base station that receives a mobile station power NACK signal has been described as an example.
- the present invention can also be applied to a base station that does not receive a NACK signal from a mobile station.
- error rate measurement section 318 measures PER using an ACK signal that also feeds back mobile station power.
- retransmission determination section 320 determines that an error has been detected when the mobile station does not provide ACK signal S feedback.
- the base station that receives only the ACK signal from the mobile station can achieve the same effects as described above.
- the present invention can also be applied to a base station that does not receive an ACK signal from a mobile station.
- error rate measurement section 318 measures PER using the NACK signal fed back from the mobile station.
- retransmission determination section 320 determines that the mobile station power is strong when no NACK signal is fed back and no error is detected. As a result, the same effect as described above can be realized in the base station that receives only the NACK signal from the mobile station.
- the present invention can also be applied when a mobile station is used as a data transmission device and a base station is used as a data reception device.
- FIG. 10 is a block diagram showing the configuration of base station 400 provided with the data communication apparatus according to Embodiment 4 of the present invention.
- base station 400 of the present embodiment is used as a data transmission device, and transmits packet data to a mobile station as a data reception device.
- Base station 400 has a basic configuration similar to that of base station 300 described in the third embodiment, and the same components as those described in the third embodiment are denoted by the same reference numerals. The detailed explanation is omitted.
- Base station 400 has a configuration in which reception quality measuring section 402 is added to the configuration of base station 300, and error rate measuring section 404 is further substituted for error rate measuring section 318 of base station 300.
- Reception quality measurement section 402 uses the pilot signal input from signal separation section 306 to measure the reception SIR of the channel on which the response signal is transmitted, and to determine the average value of the reception SIR during the predetermined period (average reception) SIR). The calculated average received SIR is output to error rate measurement section 404.
- Error rate measuring section 404 acquires the reception error rate of the mobile station as an acquisition means. Specifically, the PER of the mobile station is measured using the ACK signal and the NA CK signal to which the mobile station power is also fed back among the decoded control information.
- the error rate measurement unit 404 calculates an ACK error determination rate and a NACK error determination rate based on the input average received SIR as a calculation means. Furthermore, the error rate measurement unit 404 corrects the measured PER using the calculated ACK error determination rate and NACK error determination rate.
- the data communication apparatus includes reception quality measurement section 402, error rate measurement section 404, and retransmission determination section 320.
- Calculation of the ACK error determination rate and the NACK error determination rate in error rate measuring section 404 is performed based on the correspondence relationship between the average received SIR and the error determination rate. For example, the correspondence as shown in FIG. 11 is stored in advance in the error rate measurement unit 404, and each error determination rate is calculated using this. Is issued.
- the ACK error determination rate is the probability that an ACK signal is erroneously determined as a NACK signal
- the NACK error determination rate is the probability that a NACK signal is erroneously determined as an ACK signal.
- N is the total number of packets during the PER measurement period, and N is the PER measurement period.
- N is the number of NACK signals received
- N is the number of ACK signals received during the PER period
- P is the number of NACK signals received
- the second term (N X P) of the numerator is obtained from the mobile station.
- N XP The third term (N XP) of the numerator is the ACK signal transmitted from the mobile station.
- N force 30 is subtracted.
- a base station that receives a mobile station power NACK signal has been described as an example.
- the present invention can also be applied to a base station that does not receive a NACK signal from a mobile station.
- the error rate measurement unit 404 measures PER using the ACK signal to which the mobile station power is also fed back.
- the ACK error determination rate is calculated based on the average received SIR, and the measured PER is corrected using the calculated ACK error determination rate.
- retransmission determination section 320 determines that an error has been detected when the ACK signal is not fed back from the mobile station. As a result, in the base station that receives only the ACK signal from the mobile station, it is possible to realize the same effect as described above.
- the present invention can also be applied to a base station that does not receive an ACK signal from a mobile station.
- error rate measurement section 404 measures PER using the NACK signal fed back from the mobile station.
- the NACK misjudgment rate is calculated based on the average received SIR, and the measured PER is corrected using the calculated NACK misjudgment rate.
- retransmission determination section 320 determines that the mobile station power is strong enough to detect no error when the NACK signal is not fed back. As a result, the same effect as described above can be realized in the base station that receives only the NACK signal.
- the present invention can also be applied when a mobile station is used as a data transmission device and a base station is used as a data reception device.
- FIG. 12 is a block diagram showing a configuration of a base station including the data communication apparatus according to Embodiment 5 of the present invention.
- base station 500 of the present embodiment is used as a data transmission device, and transmits packet data to a mobile station as a data reception device.
- Base station 500 has the same basic configuration as base station 300 described in the third embodiment, and the same reference is made to the same components as those described in the third or fourth embodiment. Reference numerals are assigned and detailed descriptions thereof are omitted.
- Base station 500 has error rate measuring section 502 instead of error rate measuring section 318 of base station 300. Further, base station 500 has the configuration described in command generating section 504 and the reception described in Embodiment 4. The quality measuring unit 402 is added.
- Error rate measuring section 502 acquires the reception error rate of the mobile station as an acquisition means. Specifically, the PER of the mobile station is measured using the ACK signal and the NA CK signal to which the mobile station power is also fed back among the decoded control information.
- Error rate measuring section 502 receives notification of ACKZNACK target error rate information indicating a predetermined ACK error determination rate and a predetermined NACK error determination rate. And A The measurement PER is corrected using the CK misjudgment rate and NACK misjudgment rate.
- the specific correction method of the measurement PER is the same as the correction method in the error rate measurement unit 404 described in the fourth embodiment.
- the data communication apparatus includes error rate measurement section 502 and retransmission determination section 320.
- Command generation section 504 compares average reception SIR calculated by reception quality measurement section 402 with a predetermined target SIR. Then, a transmission power control command is generated according to the comparison result. That is, the transmission power control command is a signal for controlling the transmission power of the mobile station so that the average received SIR satisfies the target SIR.
- the transmission power control command may represent only increase / decrease in transmission power, or may represent an increase / decrease range.
- the target SIR is set in advance based on the ACK error determination rate and the NACK error determination rate indicated in the ACKZNACK target error rate information!
- the present embodiment it is possible to achieve the same operational effects as those described in the third embodiment. Furthermore, a system in which the actual ACK misjudgment rate and the actual NACK misjudgment rate are almost equal to the predetermined value by the transmission power control of the transmission channel of the ACK signal ZNACK signal, in other words, the ACK misjudgment rate and the NACK misjudgment rate are In an almost constant system, PER measurement accuracy can be improved.
- a base station that receives a mobile station power NACK signal has been described as an example.
- the present invention can also be applied to a base station that does not receive a NACK signal from a mobile station.
- the error rate measurement unit 502 measures PER using an ACK signal to which the mobile station power is also fed back.
- the measured PER is corrected using the predetermined ACK misjudgment rate.
- retransmission determination section 320 determines that an error has been detected when the ACK signal power is not fed back from the mobile station. As a result, in the base station that receives only the ACK signal from the mobile station, it is possible to realize the same effect as described above.
- the present invention can also be applied to a base station that does not receive an ACK signal from a mobile station.
- error rate measurement section 502 measures PER using the NACK signal fed back from the mobile station. Also, the measured PER is corrected using a predetermined NACK misjudgment rate.
- retransmission determination section 320 also confirms that the NACK signal is not fed back for the mobile station power. If the error is detected, it is determined that an error has not been detected. As a result, the same effect as described above can be realized in the base station that receives only the NACK signal for the mobile station power.
- the present invention can also be applied when a mobile station is used as a data transmission device and a base station is used as a data reception device.
- FIG. 13 is a block diagram showing a configuration of a base station including the data communication apparatus according to Embodiment 6 of the present invention.
- base station 600 of the present embodiment is used as a data transmission device, and transmits packet data to a mobile station as a data reception device.
- Base station 600 has the same basic configuration as that of base station 300 described in the third embodiment, and the same components as those described in the third embodiment are denoted by the same reference numerals, and details thereof are described. The explanation is omitted.
- Base station 600 is configured to include error rate measuring section 602, transmission determining section 604, and transmission control section 606 instead of error rate measuring section 318, retransmission determining section 320 and retransmission control section 322 of base station 300. It has become.
- Error rate measuring section 602 acquires the reception error rate of the mobile station as an acquisition means. Specifically, the ACK signal and NA CK signal to which the mobile station power is also fed back from the decoded control information are used, and when the execution of the new packet discard is notified from the transmission determination unit 604, the new packet discard is detected as a packet error. And measure the PER of the mobile station. That is, PER is calculated by the following equation (2). In Equation (2), N is the total number of packets during the PER measurement period, and N is the number of NACK signals received during the PER measurement period.
- N represents the number of new packets discarded during the PER measurement period.
- Transmission determining section 604 receives a required PER notification from the radio network control station. Also, the ACK signal and NACK signal fed back from the mobile station are acquired from the decoded control information. The transmission determination unit 604 performs transmission determination based on the measured PER, the required PER, and the ACK signal ZNACK signal to perform new packet transmission and new packet discard. Or, the transmission control unit 606 is instructed to execute either packet retransmission. In addition, when the number of retransmissions of a certain packet data exceeds a predetermined value (maximum number of retransmissions), the packet data is not retransmitted. The maximum number of retransmissions is determined in advance by the radio network control station based on the amount of delay allowed. The result of the transmission determination is notified to the code key unit 324 and the error rate measuring unit 602. Details of the transmission determination operation will be described later.
- the data communication apparatus of the present embodiment includes an error rate measurement unit 602 and a transmission determination unit 6004.
- Transmission control section 606 stores transmission data. When packet retransmission is instructed from transmission determining section 604, the stored transmission data is output to encoding section 326 as retransmission packet data. When the transmission determination unit 606 is instructed to transmit a new packet, the new packet data is output to the encoding unit 326. In addition, when the transmission determination unit 604 instructs to discard the new packet, the new packet data is discarded, and the new packet data next to the discarded new packet data (the next one) is encoded. Output to.
- FIG. 14 is a flowchart for explaining the transmission judgment operation of the transmission judgment unit 6004.
- step ST6000 as a comparison means, the measured PER is compared with the required PER.
- step ST6200 if the measured PER is lower than the required PER (ST6000: YES), go to step ST6200 and if the measured PER is equal to the required PER, or if the measured PER is higher than the required PER (ST6000 : NO), go to step ST6100.
- step ST6100 based on whether the response signal fed back from the mobile station is an ACK signal or a N ACK signal, it is determined whether or not the mobile station has detected an error in received data. If an error is detected (ie, NACK signal is fed back) as a result of this judgment process (ST6100: YES), the process proceeds to step ST6300, and no error is detected (that is, ACK signal is fed back) ( ST6100: NO), go to step ST6400
- Step ST6200 processing for avoiding data retransmission to the mobile station is performed as processing means. Specifically, the execution of the new packet discard is determined and the transmission control unit 606 is instructed to that effect. At the same time, the discard of new packet data is reported to the error rate measurement unit 602. And counting as packet errors. As a result of this processing, the new packet data is discarded, and the new packet data (next one) after the discarded new packet data is transmitted from the base station 600 to the mobile station.
- step ST6300 execution of packet retransmission is determined, and this is instructed to transmission control section 606.
- step ST6400 execution of new packet transmission is determined, and that is instructed to transmission control section 606.
- steps ST6000 and ST6100 may be reversed.
- FIG. 15 is a diagram for explaining the transmission / reception operation of base station 600.
- the PER measurement period is set to 10 frames.
- the required PER is set to 0.15.
- “O” indicates that no error in the received data was detected in the error detection process
- “X” indicates that an error in the received data was detected in the error detection process.
- new packet data of frame # 1 is transmitted from the base station 600, and the mobile station receives it. Since no error is detected in the received data, the mobile station feeds back the A CK signal to the base station 600. Receiving the ACK signal, base station 600 transmits new packet data of frame # 2. In this example, the above operation is repeated until frame # 5.
- the mobile station feeds back a NACK signal to the base station 600.
- the base station 600 that has received the NACK signal retransmits the same packet data as the packet data of frame # 6 in frame # 7 (Because PER is not yet acquired at this point, the above transmission determination operation is performed. It is assumed that the conventional retransmission determination operation is performed).
- This packet data is correctly received by the mobile station, and an ACK signal is fed back to base station 600.
- packet data of frames # 8, # 9, and # 10 are correctly received, and an ACK signal is fed back to base station 600.
- the measurement PER obtained at the time when the period from frame # 1 to # 10 was passed is 0.10, which is lower than the required PER. Therefore, the base station 600 transmits a new packet as a transmission process in frame # 11. The next packet data is transmitted. The mobile station that has correctly received packet data of frame #U feeds back an ACK signal to base station 600, and in response, base station 600 transmits new packet data in frame # 12.
- packet data can be prevented from being transmitted with excessive quality even in an environment in which packet data errors hardly occur.
- a base station that receives a mobile station power NACK signal has been described as an example.
- the present invention can also be applied to a base station that does not receive a NACK signal from a mobile station.
- the error rate measurement unit 602 measures PER using an ACK signal to which the mobile station power is also fed back.
- transmission determination section 604 determines that an error has been detected when the mobile station does not provide ACK signal S feedback.
- the base station that receives only the ACK signal from the mobile station can achieve the same effects as described above.
- the present invention can also be applied to a base station that does not receive an ACK signal from a mobile station.
- error rate measurement section 602 measures PER using the NACK signal fed back from the mobile station.
- transmission determination section 604 determines that the mobile station power is strong without error being detected when the NACK signal is strong without being fed back.
- the present invention can also be applied when a mobile station is used as a data transmission device and a base station is used as a data reception device.
- the data communication device, data receiving device, data transmitting device, and retransmission control method according to the present invention are not limited to the above embodiments, and can be implemented with various modifications. For example, each embodiment can be implemented in combination as appropriate.
- the present invention can be implemented by software.
- the algorithm of the retransmission control method according to the present invention is described in a programming language, the program is stored in a memory, and then executed by the information processing means, whereby the data communication apparatus and data receiving apparatus according to the present invention are executed.
- the same function as that of the data transmission device can be realized.
- the base station in each of the above embodiments may be represented as Node B, and the mobile station may be represented as UE.
- reception quality instead of the power SIR that is used to measure the reception quality of the data channel, SNR, SINR, CIR, CNR, CINR, RSS I , Reception strength, reception power, interference power, transmission rate, throughput, interference amount, or quality measurement can be performed using MCS.
- the reception quality may be expressed as CQI (Channel Quality Indicator) or CSI (Channel State Information).
- the data channel in the above embodiment for example, 3GPP (3rd Generation Partnership Project) rating, ⁇ 3 ⁇ 4, HS-D3 ⁇ 4CH (High Speed Downlink Shared and hannel), DSH (Downlink Shared Channel), DPDCH (Dedicated Physical Data Channel), DCH (Dedicated Channel), S-CCPCH (Secondary Common Control Physical Channel), FACH (Forward Access Channel), etc.
- 3GPP 3rd Generation Partnership Project
- HS-D3 ⁇ 4CH High Speed Downlink Shared and hannel
- DSH Downlink Shared Channel
- DPDCH Dedicated Physical Data Channel
- DCH Dedicated Channel
- S-CCPCH Servicedary Common Control Physical Channel
- FACH Forward Access Channel
- HS—sCCH High bpeed Shared Control Channel
- HS-DPCCH DCCH (Dedicated Control and Channel), S— and CPCH (Secondary Common Control Physical Channel), P—C to notify control information for High Speed Dedicated Physical Control Channel (RRM), Radio Resource Management (RRM) PCH (Primary Common Control Physical Channel), PCH (Paging Channel), BCH (Broadcast Channel), and DPCCH (Dedicated Physical Control Channel) for physical channel control.
- RRM Radio Resource Management
- PCH Primary Common Control Physical Channel
- PCH PCH
- BCH Broadcast Channel
- DPCCH Dedicated Physical Control Channel
- the frame used in the description of the above embodiment may be represented as a subframe, a slot, a block, or the like.
- the packet error rate used in the description of the above embodiment is a block error rate, and PER is BL. Sometimes expressed as ER.
- each functional block used in the description of each of the above embodiments is typically realized as an LSI which is an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include a part or all of them.
- IC integrated circuit
- system LSI system LSI
- super LSI super LSI
- non-linear LSI depending on the difference in power integration as LSI.
- the method of circuit integration is not limited to LSI's, and implementation using dedicated circuitry or general purpose processors is also possible. It is also possible to use a field programmable gate array (FPGA) that can be programmed after LSI manufacture and a reconfigurable processor that can reconfigure the connection and settings of circuit cells inside the LSI.
- FPGA field programmable gate array
- the data communication apparatus, data receiving apparatus, data transmitting apparatus, and retransmission control method of the present invention are applied to a base station apparatus or a mobile station apparatus of a mobile communication system employing an error control technique such as an ARQ scheme or a HARQ scheme. Can be applied.
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- Signal Processing (AREA)
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- Detection And Prevention Of Errors In Transmission (AREA)
- Mobile Radio Communication Systems (AREA)
- Communication Control (AREA)
Abstract
Description
Claims
Priority Applications (4)
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BRPI0517244-6A BRPI0517244A (pt) | 2004-10-28 | 2005-10-26 | aparelho de comunicação de dados, aparelho de recepção de dados, aparelho de transmissão de dados, e método de controle de retransmissão |
US11/718,162 US20090150738A1 (en) | 2004-10-28 | 2005-10-26 | Data communication apparatus, data receiving apparatus, data transmitting apparatus, and retransmission control method |
EP05799292A EP1802021A1 (en) | 2004-10-28 | 2005-10-26 | Data communication apparatus, data receiving apparatus, data transmitting apparatus, and retransmittal control method |
JP2006543194A JPWO2006046586A1 (ja) | 2004-10-28 | 2005-10-26 | データ通信装置、データ受信装置、データ送信装置および再送制御方法 |
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US (1) | US20090150738A1 (ja) |
EP (1) | EP1802021A1 (ja) |
JP (1) | JPWO2006046586A1 (ja) |
KR (1) | KR20070083775A (ja) |
CN (1) | CN101048968A (ja) |
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Also Published As
Publication number | Publication date |
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JPWO2006046586A1 (ja) | 2008-05-22 |
KR20070083775A (ko) | 2007-08-24 |
BRPI0517244A (pt) | 2008-10-07 |
US20090150738A1 (en) | 2009-06-11 |
CN101048968A (zh) | 2007-10-03 |
EP1802021A1 (en) | 2007-06-27 |
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