WO2006011205A1

WO2006011205A1 - Automatic retransmission control method and transmitter apparatus therefor

Info

Publication number: WO2006011205A1
Application number: PCT/JP2004/010811
Authority: WO
Inventors: Takuya Yamazaki
Original assignee: Mitsubishi Denki Kabushiki Kaisha
Priority date: 2004-07-29
Filing date: 2004-07-29
Publication date: 2006-02-02
Also published as: JPWO2006011205A1

Abstract

An automatic retransmission control method for deciding, in a transmitter apparatus, whether a response signal is a positive acknowledgement, a negative acknowledgement or an undecidable acknowledgement, from the amplitude value of the response signal received from the receiver apparatus after the transmitter apparatus performs a transmission to the receiver apparatus, comprising steps of, in the transmitter apparatus, dividing an area, in which to decide that the response signal is the undecidable acknowledgement, into a plurality of areas; receiving the response signal from the receiver apparatus; deciding that the response signal is an undecidable acknowledgement on the positive acknowledgement side when the amplitude of the received response signal corresponds to a predetermined area, which is one of the plurality of areas as divided, near a predetermined threshold value at which to decide that the response signal is the positive acknowledgement, or deciding that the response signal is an undecidable acknowledgement on the negative acknowledgement side when the amplitude of the received response signal corresponds to a predetermined area, which is one of the plurality of areas as divided, near a predetermined threshold value at which to decide the response signal is the negative acknowledgement; and performing different predetermined retransmission controls when deciding that the response signal is the undecidable acknowledgement on the positive acknowledgement side and when deciding that the response signal is the undecidable acknowledgement on the negative acknowledgement side, respectively.

Description

Specification

Automatic retransmission control method and transmission apparatus therefor

Technical field

The present invention relates to an automatic retransmission control method for data transmission and a transmission device therefor.

Background art

There is an automatic retransmission control method as a method for realizing highly reliable data transmission in various communications such as mobile communications. In this automatic retransmission control method, when data is sent from a transmission device to a reception device, the reception device that has received the data transmits a response signal to the transmission device (see, for example, Patent Document 1-13).

FIG. 17 shows a flowchart of such an automatic retransmission control method. First, when the transmitting device transmits data (step S701), the receiving device receives this data (step S702). Then, the receiving device determines whether the received data contains an error (step S703). If the received data does not contain an error (step S703, Yes), an acknowledgment response is received. A response signal (ACK: Acknowledement) is transmitted to the transmitter (step S704). If an error is included (step S703, No), a negative response signal (NACK: Negative Acknowledement) is transmitted to the transmitter. (Step S705) _{o When the} transmission device receives the response signal transmitted in this way (Step S706), the transmission device determines whether or not this response signal is ACK (Step S707), and ACKs the response signal. If it is determined (Yes in step S707), it is determined that the previous transmission has been performed correctly, this process is terminated, and the next data is transmitted in the next process. On the other hand, when it is determined that it is not ACK (step S707, No), the transmitter further determines whether or not the response signal is NA CK (step S708), and when it is determined that the response signal is NACK. (Step S708, Yes), it is determined that the previous data has not been transmitted correctly, and the previously transmitted data is retransmitted to the receiving device (Step S701).

[0004] At this time, the determination of ACK or NACK in the transmission apparatus is performed based on the magnitude of the amplitude value of the response signal. If the amplitude value of the response signal is higher than a predetermined threshold, ACK or NACK is determined. If it is lower than the predetermined threshold, it is determined as NACK. However, if the amplitude value of the response signal is lower than a predetermined threshold value for determining ACK and higher than a predetermined threshold value for determining NACK, it cannot be determined whether the response is ACK or NACK, and the transmitting apparatus Judgment of response signal Disappointment (DTX: Discontinuous Transmission)

) (Step S709). If it is determined as DTX, there is a possibility that the receiving device has not received the correct data. Therefore, as in the case of determining as NACK, the previously transmitted data is retransmitted to the receiving device (step S701). .

[0005] In addition, with such an automatic retransmission control method, for the purpose of increasing the reliability of the response signal determination process in the transmission device, a response signal having the same content of ACK or NACK is previously received by the reception device. There is a method of transmitting continuously several times that has been agreed between the transmitter and the transmitter.

[0006] A flowchart of such an automatic retransmission control method is shown in FIG. In this method, steps S801 to S803 are the same as steps S701 to S703 in FIG. Thereafter, if the data received by the receiving device includes an error, the receiving device continuously transmits an ACK response signal to the transmitting device only a plurality of times (step S804). If it is included, the NACK response signal is continuously transmitted to the transmitting device only a plurality of times (step S805). When the transmission device receives the response signal transmitted in this way (step S806), the transmission device determines whether all the response signals of the plurality of times have been received (step S807), and determines that all have been received. If (step S807, Yes), the process proceeds to the next step S808, and if it is determined that all have not been received (step S807, No), a response signal is further received (step S806).

[0007] Next, the transmitting apparatus determines whether or not these response signals are ACK (step S808), and if all the response signals are determined to be ACK (step S808, Yes), It is determined that the previous transmission was performed correctly, and this process is terminated. The next data is transmitted in the next process. On the other hand, if it is determined that at least one response signal is not an ACK (step S808, No), the transmitting device determines whether the response signal is a NACK (step S809), and returns the response signal. If it is determined as NACK (step S809, Yes), it is determined that the previous data has not been transmitted correctly, and the previously transmitted data is retransmitted to the receiving device ( Step S801). On the other hand, if it is determined that the response signal is not NACK (step S809, No), the transmitting device determines that the response signal is DTX (step S810), and the receiving device does not receive the correct data. Since there is a possibility, the previously transmitted data is retransmitted to the receiving device (step S801).

Patent Document 1: Japanese Patent Laid-Open No. 3-19441

Patent Document 2: JP-A-8-65279

Patent Document 3: Japanese Patent Laid-Open No. 2000-224140

Disclosure of the invention

Problems to be solved by the invention

[0008] However, in the conventional automatic retransmission control method described above, when the transmitting apparatus determines that the response signal is DTX, the previously transmitted data must always be retransmitted to the receiving apparatus. As a result, the data communication efficiency is increased. There is a problem of getting worse.

[0009] Each time the transmission device transmits data to the reception device, the reception device sends a response signal having the same content to the transmission device only a plurality of times that has been previously decided between the reception device and the transmission device. In the continuous sending method, the transmission device cannot determine whether the response signal is ACK or NACK until the transmission device receives all response signals a plurality of times. As a result, there is a problem that the time required for the determination becomes longer and the communication efficiency is worse than the method of sending the response signal only once.

The present invention has been made in view of the above, and an object thereof is to obtain an automatic retransmission control method for data transmission and a transmission device therefor.

Means for solving the problem

[0011] In order to solve the above-described problem and achieve the object, an automatic retransmission control method for data transmission according to the present invention performs transmission from a transmission device to a reception device, and then performs transmission in the transmission device. If the amplitude value of the response signal received from the receiving device falls below a predetermined threshold value for determining an affirmative response and falls above a predetermined threshold value for determining a negative response, the response signal is An automatic retransmission control method for determining an undecidable response, in which a transmission device divides an area determined to be DTX into a plurality of areas, and an amplitude value of a response signal received from a reception apparatus is divided into a plurality of areas. Out of the areas judged as DTX If it corresponds to a predetermined area close to a predetermined threshold determined as CK, the response signal is determined as ACK-side DTX, and if it corresponds to a predetermined area close to a predetermined threshold determined as NACK, The response signal is determined to be NACK side DTX, and different retransmission control is performed in each case to improve communication efficiency.

[0012] In addition, the automatic retransmission control device for data transmission according to the present invention performs predetermined transmission in which the amplitude value of the response signal received from the receiving device is determined as an affirmative response after transmitting to the receiving device. A transmission device that performs automatic retransmission control that determines that the response signal is an undecidable response when the region falls below a threshold and is higher than a predetermined threshold that is determined to be a negative response, and is transmitted to the reception device. After performing the above, a receiving unit that receives a response signal from the receiving device and a region in which the amplitude value of the response signal received from the receiving device by the receiving unit is determined to be the undecidable response are divided. In the case where a predetermined region close to a predetermined threshold value determined to be an affirmative response among a plurality of set regions, the response signal is determined to be an affirmative response side determination impossible response, and the negative response is determined. Predetermined threshold When the value falls within a predetermined area close to the value, when the response control signal determines that the response signal is a negative response side determination impossible response, and when the determination control device determines that the response side is an unacceptable response, or In addition, when the determination control unit determines that the negative response side determination impossible response, it includes a retransmission control unit that performs different predetermined retransmission control.

The invention's effect

[0013] According to the present invention, the transmission apparatus waits for a predetermined time when it can be determined as ACK side DTX even when it has been determined as DTX even though the response signal is ACK in the past. If the response signal is not received again from the receiving apparatus, the next data communication can be performed without re-transmission, so that the communication efficiency can be improved. There is an effect.

Brief Description of Drawings

FIG. 1 is an explanatory diagram for explaining a method of determining a response signal received by a transmitting device from a receiving device.

FIG. 2 is a block diagram functionally illustrating the configuration of the communication system in the first embodiment. FIG.

FIG. 3 is an explanatory diagram for explaining a method by which the determination control unit 12a determines a response signal in the first embodiment.

FIG. 4 is a flowchart of automatic retransmission control processing in the first embodiment.

FIG. 5 is a block diagram illustrating a functional concept of the configuration of the communication system in the second embodiment.

[Fig. 6] Fig. 6 is an explanatory diagram illustrating a method by which the determination control unit 32a determines a response signal in the second embodiment.

FIG. 7 is a flowchart of automatic retransmission control processing in the second embodiment.

FIG. 8 is a block diagram illustrating a functional concept of the configuration of the communication system in the third embodiment.

FIG. 9 is a flowchart of automatic retransmission control processing in the third embodiment.

FIG. 10 is a block diagram illustrating a functional concept of the configuration of a communication system in a fourth embodiment.

[Fig. 11] Fig. 11 is an explanatory diagram for explaining a method by which the determination control unit 62a determines a response signal in the fourth embodiment.

FIG. 12 is a flowchart of automatic retransmission control processing in the fourth embodiment.

FIG. 13 is a block diagram illustrating a functional concept of the configuration of a communication system in the fifth embodiment.

FIG. 14 is a flowchart of automatic retransmission control processing in the fifth embodiment.

FIG. 15 is a block diagram illustrating a functional concept of the configuration of a communication system in the sixth embodiment.

FIG. 16 is a flowchart of automatic retransmission control processing in the sixth embodiment.

FIG. 17 is a flowchart of conventional automatic retransmission control processing.

FIG. 18 is a flowchart of conventional automatic retransmission control processing.

Explanation of symbols

10, 30, 50, 60, 70, 80 Transmitter

11 Generator 12, 32, 52, 62, 72, 82 Controller

12a, 32a, 52a, 62a, 72a, 82a Half U constant control part

12b, 32b, 52b, 62b, 72b, 82b Playback control unit

82c Division control unit

13 modem

14 Transceiver

20, 40 Receiver

21 Generator

22 Control unit

23 Modulator / Demodulator

24, 44 Transceiver

BEST MODE FOR CARRYING OUT THE INVENTION

[0016] Exemplary embodiments of an automatic retransmission control method and a transmission apparatus therefor will be described in detail below with reference to the accompanying drawings. First, the basic concept of the present invention will be described, then each embodiment of the present invention will be described, and finally, modifications to each embodiment of the present invention will be described.

First, the basic concept of the present invention will be described. In the present invention, transmission / reception of data to which automatic retransmission control is applied is performed between the transmission device and the reception device. In this automatic retransmission control, every time data is transmitted from the transmission device to the reception device, a response signal is returned from the reception device to the transmission device. Upon receiving this response signal, the transmitting apparatus classifies the response signal into one of a plurality of regions based on the amplitude value, and performs retransmission control according to the region. FIG. 1 is an explanatory diagram for explaining a method of determining a response signal received by a transmitting device from a receiving device. The ACK determination threshold Nil determines the boundary of the ACK area R11, and the NACK determination threshold N12 determines the boundary of the NACK area R12. A region between the ACK determination threshold Nl 1 and the NACK determination threshold N12 is a DTX region R13.

Here, conventionally, response signals have been classified into one of three regions of ACK region Rll, NACK region R12, or DTX region R13. The area is further divided into a plurality of areas. The number of divisions of this DTX is arbitrary. For example, The DTX is divided into two parts: an ACK side DTX region R13a which is a DTX region closer to the ACK, and a NACK side DTX region R13b which is a DTX region closer to the NACK. Then, different retransmission control is performed depending on the amplitude value ACK side DTX region R13a of the response signal and the case corresponding to the NACK side DTX region R13b. As a result, a response signal that has been determined to be DTX in the past may be determined to be ACK or NACK. As a result, the number of data retransmissions can be reduced, and data communication efficiency can be improved. .

[0019] Further, in some embodiments of the present invention, every time data is transmitted from the transmission device to the reception device, a response signal with the same content is returned from the reception device to the transmission device multiple times. Then, the transmission apparatus performs retransmission control based on some or all of the plurality of response signals. For example, if the response signal corresponding to the DTX region near the ACK is continuously transmitted for a predetermined number of times or more, the response signal is determined as ACK, and the response signal corresponding to the DTX region near the NACK is the predetermined number of times or more. If transmitted continuously, this response signal is determined to be NA CK. This also reduces the number of data retransmissions and improves data communication efficiency.

[0020] Embodiment 1.

Next, Embodiment 1 will be described. The automatic retransmission control method and the transmission apparatus therefor according to Embodiment 1 are roughly divided into (l) a DTX region divided into a plurality of regions, and an amplitude value of a response signal is divided into a plurality of divided regions. Of these, if it falls in the area near the predetermined threshold value judged as ACK, the response signal is judged as ACK-side DTX, and judged as NACK. If it falls in the area near the predetermined threshold value, the response signal is NACK. (2) When the transmitting device determines that it is an ACK-side DTX and receives a response signal again from the receiving device within a predetermined time, the first response signal is determined to be NACK. If it is not received, the main feature is to perform retransmission control by determining the first response signal as ACK.

[0021] First, a configuration of a communication system that executes the automatic retransmission control method according to the first embodiment will be described. FIG. 2 is a block diagram illustrating the configuration of the communication system in terms of functional concept. As shown in FIG. 2, the communication system includes a transmission device 10 and a reception device 20. Among these, the transmission device 10 includes a generation unit 11, a control unit 12, and a modem unit. 13 and a transmission / reception unit 14.

Here, the generation unit 11 is a generation unit that generates data to be transmitted to the reception device 20. In addition, the control unit 12 performs coding processing and channel coding processing on the generated data, decoding processing and channel coding processing on the demodulated response signal, determination processing on the decoded response signal, and This is a control means for performing data retransmission processing based on the determination result. The control unit 12 includes a determination control unit 12a and a retransmission control unit 12b in terms of functional concept.

[0023] Among these, the determination control unit 12a is a determination control means for performing determination control of the decoded response signal. FIG. 3 is an explanatory diagram for explaining a method by which the determination control unit 12a makes a determination based on the response signal received from the receiving device 20 in the present embodiment. Here, in the present embodiment, as shown in FIG. 3, by setting the determination threshold N13, the region R13a near the threshold Ni for determining the DTX region R13 force ACK and the threshold for determining the NACK are set. Divided into two regions R13b near the value N12. These determination threshold values Nil-N13 are stored in an arbitrary method in a storage unit (not shown) in advance, and the determination control unit 12a responds by referring to the determination threshold values Nl1-N13 stored in the storage unit. Perform signal determination control.

[0024] The retransmission control unit 12b is retransmission control means for performing retransmission control of data. Specifically, if the retransmission control unit 12b determines that the previous data has not been transmitted correctly based on the determination result of the response signal, the retransmission control unit 12b retransmits the previously transmitted data to the receiving device 20, or If it is determined that the previous transmission has been performed correctly, this process is terminated, the process proceeds to the next process, and reproduction control is performed to transmit the next data.

The modulation / demodulation unit 13 is modulation / demodulation means that modulates the data that has been subjected to the encoding and channel coding processing and demodulates the received response signal. The transmission / reception unit 14 is transmission / reception means for transmitting modulated data to the reception device 20 and receiving a response signal transmitted from the reception device 20.

Next, the receiving device 20 is configured to include a generating unit 21, a control unit 22, a modem unit 23, and a transmitting / receiving unit 24. Here, the generation unit 21 is a generation unit that generates a response signal to be transmitted to the transmission device 10. In addition, the control unit 22 performs encoding processing and channel coding processing on the generated response signal, and decoding processing on the demodulated data. And control means for performing channel coding processing. The modem unit 23 is a modulation / demodulation unit that modulates the response signal subjected to the code coding and channel coding processing and demodulates the received data. The transmission / reception unit 24 is transmission / reception means for transmitting a modulated response signal to the transmission device 10 and receiving data transmitted from the transmission device 10.

[0027] Hereinafter, automatic retransmission control processing when data is transmitted from the transmission device 10 to the reception device 20 will be described. A flowchart of this process is shown in FIG. First, when the transmitting device 10 transmits data (step S101), the receiving device 20 receives this data (step S102). Then, the control unit 22 of the receiving device 20 determines whether the received data contains an error or not (step S103), and the received data contains an error. In this case, an ACK response signal is transmitted to the transmitting apparatus 10 (step S 104). If an error is included, a NACK response signal is transmitted to the transmitting apparatus 10 (step S 105).

[0028] When the transmission device 10 receives the response signal transmitted in this manner (step S106), the determination control unit 12a of the transmission device 10 determines whether or not the response signal is ACK (step S107). ). That is, if the determination control unit 12a determines that the response signal is ACK (step S107, Yes), the determination control unit 12a determines that the previous transmission has been performed correctly and ends this process. In this case, the transmitting apparatus 10 proceeds to the next process and transmits the next data. On the other hand, when determining that the response signal is not ACK in step S107 (step S107, No), the determination control unit 12a of the transmission device 10 further proceeds to the next step S108. In step S108, the determination control unit 12a determines whether or not the response signal is NACK. If the determination control unit 12a determines that the response signal is NACK (step S108, Yes), it is considered that the previous data has not been transmitted correctly, so the retransmission control unit 12b receives the previously transmitted data as a receiving device. Resend to 20 (step S101). On the other hand, when the determination control unit 12a determines that the response signal is not NACK in step S108 (step S108, No), the process proceeds to the next step S109.

In step S 109, determination control unit 12 a determines whether or not this response signal is ACK side DTX. If the determination control unit 12a determines that the response signal is not the ACK side DTX (step S109, No), it is considered that the previous data has not been transmitted correctly. Therefore, the retransmission control unit 12b retransmits the previously transmitted data to the receiving device 20 (step S101). On the other hand, when the determination control unit 12a determines that the response signal is ACK side DTX in Step S109 (Yes in Step S109), the process proceeds to the next Step S113.

[0030] The ACK side DTX is determined in this way for the following reason. That is, conventionally, at this stage, the transmitting apparatus 10 determines that the response signal is DTX, determines that there is a possibility that the previous data has not been transmitted correctly, and has received the previously transmitted data to the receiving apparatus 20. I was resending. On the other hand, in the present invention, retransmission is not performed only by determining DTX, and it is further determined whether or not DTX is the ACK side DTX. As a result, even if the response signal corresponds to DTX, in a predetermined case, the process proceeds to step S113 described later without performing retransmission, thereby reducing the retransmission rate and improving the communication efficiency. Yes. In this case, any range can be set for the DTX area that is determined as the ACK DTX.

[0031] Here, the control unit 22 of the reception device 20 transmits the ACK response signal in step S104 or the NACK response signal in step S105 to the transmission device 10, and then receives the reception device 20 and the transmission device 10 in advance. The process waits for a predetermined time T1 (step S110). Then, the control unit 22 waits for data to be sent from the transmitting device 10 until the predetermined time T1 elapses (step S111), and if data is received within the predetermined time T1 (step Sll, Yes). Returning to the beginning of this process, the received data is determined. On the other hand, if the control unit 22 does not receive the data within the predetermined time T1 (No at Step S11), the control unit 22 sends the NACK response signal to the transmitting device 10 again (Step S112).

On the other hand, the determination control unit 12a of the transmission device 10 waits for a predetermined time T2 that has been agreed in advance between the reception device 20 and the transmission device 10 in Step S113 (Step S113). Then, the determination control unit 12a waits for a response signal from the receiving device 20 until the predetermined time T2 elapses (step S114). When the response signal is received again within the predetermined time T2 (step S114, Yes), ACK side It is determined that the previous response signal determined as DTX is NACK correctly. In this case, since it is considered that the previous data has not been transmitted correctly, the retransmission control unit 12b retransmits the previously transmitted data to the receiving device 20 (step S101). On the other hand, if the determination control unit 12a does not receive the response signal again within the predetermined time T2 (step S114, No), the previous response signal determined as ACK side DTX is correct. Or ACK. In this case, it is considered that the previous data has been transmitted correctly, so the retransmission control unit 12b ends this process. In this case, the transmitting apparatus 10 proceeds to the next process and transmits the next data.

[0033] The reason for waiting for the predetermined time Tl, Τ2 in this way is as follows. In other words, conventionally, the transmitting apparatus 10 did not wait for a certain time during the automatic retransmission control process. On the other hand, in the present invention, the transmitting device 10 waits for a predetermined time Τ2 that has been negotiated between the receiving device 20 and the transmitting device 10 in advance, and again from the receiving device 20 within the predetermined time Τ2. When a response signal is received, the previous response signal determined as ACK-side DTX can be correctly determined as ACK again. Therefore, it is possible to perform retransmission control more accurately when it is determined as ACK side DTX.

[0034] Thus, according to the automatic retransmission control method and transmitting apparatus 10 therefor according to Embodiment 1, transmitting apparatus 10 determines that the response signal is DTX even though it has conventionally been an ACK. If it can be determined as ACK-side DTX even if it has been received, it waits for a predetermined time Τ2 and waits for reception of a response signal from the receiver 20 again. Since it is possible to shift to the next data communication without performing it, it is possible to improve the communication efficiency. In addition, when the response signal is received again, the transmitting apparatus 10 retransmits the data, thereby performing retransmission control more accurately when it is determined as ACK side DTX, and improving communication reliability. Can be made.

Embodiment 2.

Next, Embodiment 2 will be described. The automatic retransmission control method and the transmission apparatus therefor according to the second embodiment generally have the same features as in the first embodiment, but each time the transmission apparatus performs transmission to the reception apparatus, the transmission is performed. The main feature is that when the device receives a response signal having the same content from the receiving device a plurality of times, the transmitting device adds the amplitude values of all the response signals and makes a determination based on the addition result.

FIG. 5 is a block diagram exemplarily conceptually illustrating the configuration of a communication system that executes the automatic retransmission control method according to the second embodiment. The structure and method that are not particularly described are the same as those in the first embodiment described above, and the same components are described with the same reference numerals. As shown in FIG. 5, the communication system includes a transmission device 30 and a reception device 40. Has been. Here, the transmission device 30 is configured to include a control unit 32 instead of the control unit 12 of the first embodiment. The control unit 32 performs encoding processing and channel coding processing on the generated data, decoding processing and channel coding processing on the demodulated response signal, addition processing of the amplitude value of the decoded response signal, and decoding. It is a control means which performs the determination processing of the response signal made into a data, and the data retransmission processing based on the determination result. The control unit 32 includes a determination control unit 32a and a retransmission control unit 32b in terms of functional concept.

[0037] Among these, the determination control unit 32a is a determination control means for performing determination control of the decoded response signal. Here, in the present embodiment, the determination control unit 32a adds the amplitude values of the response signals having the same contents received from the receiving device 40 a plurality of times, and performs determination control based on the addition result.

FIG. 6 shows a method of determining a response signal based on the result of adding the amplitude values of response signals of the same content received from the reception device 40 a plurality of times by the determination control unit 32a in the present embodiment. It is explanatory drawing explaining these. Here, the ACK determination threshold N21 determines the boundary of the ACK region R21, the NACK determination threshold N22 determines the boundary of the NACK region R22, and the region between the ACK determination threshold N21 and the NACK determination threshold N22 is the DTX region. R23. Here, by setting decision threshold N23, DTX area R23 is further divided into two parts: ACK-side DTX area R23a, which is a DTX area closer to ACK, and NACK-side DTX area R23b, which is a DTX area closer to NACK. . These determination threshold values N21 to N23 are stored in an arbitrary method in advance in a storage unit (not shown), and the determination control unit 32a refers to the determination threshold values N21 to N23 stored in the storage unit, and performs a plurality of times. Based on the result of adding the amplitude values of the received response signals with the same contents, response signal decision control is performed.

[0039] The retransmission control unit 32b is retransmission control means for performing retransmission control of data. Specifically, when it is determined that the previous data has not been transmitted correctly based on the determination result in the determination control unit 32a, the retransmission control unit 32b retransmits the previously transmitted data to the receiving device 40, and Alternatively, if it is determined that the previous transmission has been performed correctly, this process is terminated, the next process is performed, and retransmission control is performed to transmit the next data.

Next, the receiving device 40 includes a transmission / reception unit 44 instead of the transmission / reception unit 24 of the first embodiment. Configured. Here, the transmission / reception unit 44 transmits the modulated response signal to the transmission device 30 continuously for a predetermined number of times (M times) and receives / transmits data transmitted from the transmission device 30 It is.

[0041] Hereinafter, automatic retransmission control processing when data is transmitted from the transmission device 30 to the reception device 40 will be described. A flowchart of this process is shown in FIG. First, when the transmitting device 30 transmits data (step S201), the receiving device 40 receives this data (step S202). Then, the control unit 22 of the receiving device 40 determines whether the received data includes an error or not (step S203). In the case where the received data contains an error, the receiving device 40 continuously transmits an ACK response signal M times as previously determined between the receiving device 40 and the transmitting device 30. If it contains an error (step S204), a response signal of NACK is sent continuously to the transmitter 30 for M times as determined in advance between the receiver 40 and the transmitter 30. Send (step S2 05).

[0042] When the transmission device 30 receives the response signal transmitted in this way (step S206), every time the response control signal is received, the determination control unit 32a of the transmission device 30 receives the amplitude value of the response signal so far. Are added (step S207). Thereafter, the determination control unit 32a determines whether or not the response signal from the receiving device 40 has been received all M times (step S208). If not received all M times (step S208, No), step S206 By returning to, it waits for reception of a response signal until it is received M times (step S206). On the other hand, if the determination control unit 32a determines in step S208 that all the response signals from the receiving device 40 have been received M times (step S208, Yes), the process proceeds to the next step S209.

[0043] The reason why the amplitude values of all response signals are added a plurality of times in this manner is as follows. In other words, conventionally, if it is determined that the transmission device 30 is not an ACK even once among the multiple response signals received from the reception device 40, the previous data may not be transmitted correctly. And the previously transmitted data was retransmitted to the receiving device 40.

[0044] On the other hand, in the present invention, even when the individual determination results of the response signals of a plurality of times are different, the transmission device 30 is based on the result of adding all the response signals a plurality of times. Can transfer to the next data communication without retransmitting, reducing the retransmission rate. Communication efficiency can be improved.

[0045] After that, the flow from step S209 to step S216 is the same as the flow from step S107 to step S114 in Fig. 3 in the first embodiment, and a description thereof will be omitted. However, unlike the first embodiment, the response signal determination process in the flow from step S209 to step S211 is performed by comparing the addition result in step S207 with a predetermined threshold value N21 N23.

[0046] Thus, according to the automatic retransmission control method and the transmission device 30 therefor according to the second embodiment, the transmission device 30 conventionally differs in the individual determination results of a plurality of response signals, and the previous data Even if it has been retransmitted, it is possible to shift to the next data communication without performing retransmission based on the result of adding all the response signals multiple times, thus reducing the retransmission rate and improving the communication efficiency. Can be improved.

[0047] Embodiment 3.

Next, Embodiment 3 will be described. The automatic retransmission control method and the transmission apparatus therefor according to the third embodiment generally have the same features as those in the first embodiment, but each time the transmission apparatus performs transmission to the reception apparatus, the transmission is performed. When the device receives a response signal with the same content from the receiving device multiple times, each time the transmission device receives a response signal with the same content, the amplitude values of all the response signals received so far are added. If it is possible to make a determination based on the addition result, the main feature is that the determination is made without waiting for the reception of all response signals.

[0048] FIG. 8 is a block diagram functionally illustrating the configuration of a communication system that executes the automatic retransmission control method according to the third embodiment. The structure and method that are not particularly described are the same as those in the first embodiment described above, and the same components are described with the same reference numerals. As shown in FIG. 8, the communication system includes a transmission device 50 and a reception device 40. Here, the transmission device 50 is configured to include a control unit 52 instead of the control unit 12 of the first embodiment. The control unit 52 is a control unit that performs coding processing and channel coding processing on the generated data, decoding processing and channel coding processing on the demodulated response signal, and the like. The control unit 52 includes a determination control unit 52a and a retransmission control unit 52b in terms of functional concept. [0049] Among these, the determination control unit 52a is a determination control means for performing determination control of the decoded response signal. Here, in the present embodiment, every time the transmitting device 50 receives a response signal from the receiving device 40, the determination control unit 52a adds the amplitude values of all the response signals received so far. A determination is made based on the addition result. The retransmission control unit 52b is retransmission control means for performing retransmission control of data. Specifically, the retransmission control unit 52b retransmits the previously transmitted data to the receiving device 40 when it is determined that the previous data has not been transmitted correctly based on the determination result in the determination control unit 52a. However, if it is determined that the previous transmission was performed correctly, this process is terminated, and the next process is performed to perform retransmission control for transmitting the next data.

[0050] Hereinafter, automatic retransmission control processing when data is transmitted from the transmission device 50 to the reception device 40 will be described. A flowchart of this process is shown in FIG. Here, the flow from step S301 to step S306 is the same as the flow from step S201 to step S206 in FIG. 7 in the second embodiment, and description thereof will be omitted.

[0051] After receiving the response signal from the receiving device 40 in step S306, each time the determination control unit 52a of the transmitting device 50 receives the response signal, the amplitude of the response signal having the same content as the received response signal is received. Value, and the amplitude values of all response signals received so far are calculated (step 307). Then, the determination control unit 52a determines whether or not the response signal is ACK based on the addition result (step S308). If the determination control unit 52a determines that the response signal is ACK (step S308, Yes), it can be considered that the previous transmission has been performed correctly, and thus this processing is terminated. In this case, the process proceeds to the next process and the next data is transmitted. On the other hand, if the determination control unit 52a determines that the response signal is not ACK in step S308 (step S308, No), the process proceeds to the next step S309.

[0052] In step S309, the determination control unit 52a of the transmission device 50 determines whether or not the response signal is NACK based on the result of adding the amplitude values of the response signal calculated in step S307. If the determination control unit 52a determines that the response signal is NACK (Yes in step S309), it can be considered that the previous data has not been transmitted correctly, so the retransmission control unit 52b Retransmit to receiver 40 (step S3 01). On the other hand, if the determination control unit 52a determines that the response signal is not NACK in step S309 (step S309, No), the process proceeds to the next step S310.

[0053] In this manner, every time a response signal having the same content received a plurality of times is received, the amplitude values of all the response signals received so far are added, and the response signal is based on the addition result. The decision is made for the following reasons. In other words, conventionally, the response signal cannot be determined unless the transmitter 50 has received all the response signals received from the receiver 40 a plurality of times. On the other hand, in the present invention, the transmission device 50 determines the response signal based on the addition result, and when it can be determined as ACK or NACK, the previous data is retransmitted or the next data is transmitted. You can send. As a result, since it is possible to make a determination without waiting for reception of all response signals, the time spent from reception of a response signal to determination of the response signal can be shortened, and communication efficiency can be improved. The

[0054] Next, in step S310, the determination control unit 52a of the transmission device 50 determines whether or not the response signal from the reception device 40 has been received all M times. (Step S310, No), the process returns to Step S306, and waits for reception of a response signal until it is received M times (Step S306). On the other hand, if the determination control unit 52a determines in step S310 that all the response signals from the receiving device 40 have been received M times (step S310, Yes), the process proceeds to the next step S311.

[0055] The flow from step S311 to step S316 is the same as the flow from step S211 to step S216 in Fig. 7, and will not be described below.

[0056] As described above, according to the automatic retransmission control method and the transmission device 50 therefor according to the third embodiment, the transmission device 50 has received all the response signals before receiving the response signal multiple times. Based on the result of adding the response signals, the previous data can be retransmitted or the next data can be transmitted in a predetermined case. As a result, since it is possible to make a determination without waiting for reception of all response signals, it is possible to shorten the time spent from receiving the response signal to determining the response signal, and improving communication efficiency. Can do.

[0057] Embodiment 4.

Next, Embodiment 4 will be described. Automatic retransmission control method according to the fourth embodiment In addition, the transmitter for this purpose has roughly the same characteristics as those of the first embodiment, but further, (l) the DTX area is divided into three areas, and the amplitude value of the response signal is determined as ACK. If the area falls between the area close to the predetermined threshold and the area close to the predetermined threshold determined as NACK, the response signal is determined as intermediate DTX, and (2) the transmitter When the transmitter receives a response signal of the same content from the receiver multiple times each time the transmitter transmits to the receiver, the transmitter receives all the amplitude values of the response signal received continuously a predetermined number of times. When DTX is determined, the response signal is determined as ACK without waiting for reception of all response signals, or when all the amplitude values of the response signal received continuously for a predetermined number of times are determined as NACK DTX NACK response signals without waiting for reception of all response signals. And (3) every time the transmitting device transmits to the receiving device, the transmitting device receives the response signal having the same contents from the receiving device multiple times. If the signal amplitude value is determined to be ACK even once, the response signal is determined to be ACK without waiting for reception of all response signals, or the amplitude value of the received response signal is determined to be NACK even once. In this case, the main feature is that the response signal is determined to be NACK without waiting for reception of all response signals.

[0058] FIG. 10 is a block diagram functionally illustrating the configuration of a communication system that executes the automatic retransmission control method according to the fourth embodiment. The structure and method that are not particularly described are the same as those in the first embodiment described above, and the same components are described with the same reference numerals. As shown in FIG. 10, the communication system includes a transmission device 60 and a reception device 40. Here, the transmission device 60 is configured to include a control unit 62 instead of the control unit 12 of the first embodiment. The control unit 62 is a control unit that performs encoding processing and channel coding processing on the generated data, decoding processing and channel coding processing on the demodulated response signal, and the like. The control unit 62 includes a determination control unit 62a and a retransmission control unit 62b in terms of functional concept.

[0059] Of these, the determination control unit 62a is a determination control means for performing determination control of the decoded response signal. Here, in the present embodiment, every time the response signal is received from the receiving device 40, the determination control unit 62a sequentially stores the amplitude values of these response signals, and further receives all the received signals so far. Add the amplitude value of the response signal. Then, the judgment control unit 62a The response signal is determined from the result of adding the amplitude values of these sequentially stored response signals or the amplitude values of all response signals received so far, and determination control is performed based on this result.

Five.

FIG. 11 is a diagram illustrating a method for determining the response signal based on the amplitude value of the response signal having the same content received M times from the receiving device 40 in the present embodiment. FIG. Here, the ACK determination threshold Nil determines the boundary of the ACK region R11, and the NACK determination threshold N12 determines the boundary of the NACK region R12. A region between the ACK determination threshold value Nil and the NACK determination threshold value N12 is a DTX region R13. Here, by setting the decision threshold N33a and decision threshold N33b in the DTX region, the DTX region R13 is set to the ACK side DTX region R33a that is the DTX region near the ACK, and the NACK side DTX region R33b that is the DTX region near the NACK. And an intermediate DTX region R33c which is a region sandwiched between the ACK side DTX region R33a and the NACK side DTX region R33b. These determination threshold values Nl l, N12, N33a, N33b are stored in advance in an arbitrary method in a storage unit (not shown), and the determination control unit 62a stores the determination threshold values Nl l, N12, N stored in the storage unit. By referring to 33a and N33b, response signal determination control is performed based on the amplitude value of the response signal of the same content received M times.

[0061] The retransmission control unit 62b is retransmission control means for performing retransmission control of data. Specifically, if the retransmission control unit 62b determines that the previous data has not been transmitted correctly based on the determination result in the determination control unit 62a, the retransmission control unit 62b retransmits the previously transmitted data to the receiving device 40, and Alternatively, if it is determined that the previous transmission has been performed correctly, this process is terminated, the next process is performed, and retransmission control is performed to transmit the next data.

[0062] Hereinafter, automatic retransmission control processing when data is transmitted from the transmission device 60 to the reception device 40 will be described. A flowchart of this process is shown in FIG. Here, the flow from step S401 to step S406 is the same as the flow from step S301 to step S306 in FIG. 9 in the third embodiment, and the description thereof will be omitted.

[0063] After receiving the response signal from the receiving device 40 in step S406, the determination control unit 62a of the transmitting device 60 determines whether or not the response signal is ACK each time the response signal is received. (Step S407). Then, the determination control unit 62a determines that the response signal is ACK. If this is the case (step S407, Yes), it is considered that the previous transmission was performed correctly, so this process ends. In this case, the process proceeds to the next process and the next data is transmitted. On the other hand, if the determination control unit 62a determines in step S407 that the response signal is not ACK (step S407, No), the process proceeds to the next step S408. In step S408, the determination control unit 62a determines whether or not this response signal is NACK. If the determination control unit 62a determines that the response signal is NACK (Yes in step S408), it is considered that the previous data has not been transmitted correctly, so that the retransmission control unit 62b receives the previously transmitted data as a receiving device. Resend to 40 (step S401). On the other hand, when the determination control unit 62a determines in step S408 that the response signal is not NACK (step S408, No), the process proceeds to the next step S409.

[0064] The reason why the response signal is determined each time a response signal having the same content received a plurality of times is received is as follows. That is, conventionally, the response signal cannot be determined unless the transmitter 60 has received all the response signals received from the receiver 40 a plurality of times. On the other hand, in the present invention, when the transmitting device 60 determines that the amplitude value of the received response signal is ACK even once, the transmitting device ACKs the response signal without waiting for reception of all response signals. Or if the amplitude value of the received response signal is determined to be NACK even once, the response signal is determined to be NA CK without waiting for reception of all response signals, and the previous data is retransmitted. Alternatively, the next data can be transmitted. As a result, since it is possible to make a determination without waiting for reception of all response signals, the reception power of the response signal can also reduce the time spent for determining the response signal and improve communication efficiency. .

[0065] Next, each time the determination control unit 62a of the transmission device 60 receives a response signal of the same content received M times from the reception device 40, the amplitude value of these response signals is sequentially stored and further stored. The amplitude values of all the response signals received in step 409 are added (step 409). In the next step 410, the determination control unit 62a determines whether the amplitude value of the response signal having the same contents received M times is continuously ACK-side DTX for a predetermined number of times (here, the predetermined number of times N ≤ multiple times M). Then, the determination control unit 62a determines that the response signal is ACK when the amplitude value of the response signal having the same content received M times is determined to be the ACK side DTX continuously for a predetermined number of times (STEP). (S410, Yes). In this case, it is considered that the previous transmission was performed correctly, and thus this processing is terminated. Then, the process proceeds to the next process, and the next data is transmitted. On the other hand, when the amplitude value of the response signal having the same contents received M times does not determine the AC K side DTX continuously for a predetermined number of times (step S410, No), the determination control unit 62a further performs the next step. Proceed to step S4 11.

In step S411, determination control unit 62a determines whether or not the amplitude value of the response signal having the same content received M times is the NACK side DTX continuously for a predetermined number of times. Then, the determination control unit 62a determines that the response signal is NACK when the amplitude value of the response signal having the same content received M times is determined to be the NACK side DTX for a predetermined number of times (step S1 In this case, it is considered that the previous data has not been transmitted correctly, so the retransmission control unit 62b retransmits the previously transmitted data to the receiving device 40 (step S401). On the other hand, in step S411, when the determination control unit 62a does not determine that the amplitude value of the response signal having the same content received M times is NACK side DTX continuously for a predetermined number of times (step S411, No), Further, the process proceeds to next step S412. The subsequent flow from step S412 to step S418 is the same as the flow from step S310 to step S316 in FIG. 9 in the third embodiment, and description thereof will be omitted.

[0067] In this way, every time a response signal having the same content received multiple times is received, the amplitude value of the response signal received so far is continuously ACK-side DTX or NACK-side DTX. Whether or not there is is determined for the following reason. In other words, conventionally, the response signal cannot be determined until after the transmission device 60 has received all the response signals received from the reception device 40 a plurality of times. On the other hand, in the present invention, the transmission device 60 waits for reception of all response signals when the amplitude value of the response signal received thus far is the ACK side DTX continuously for a predetermined number of times. If the response signal is determined to be ACK, or the amplitude value of the response signal received so far is the NACK side DTX for a predetermined number of times, the response signal is not waited for reception of all response signals. Can be determined as NACK, and the previous data can be retransmitted or the next data can be transmitted. As a result, determination can be performed without waiting for reception of all response signals, so that the time spent from reception of response signals to determination of response signals can be shortened, and communication efficiency can be improved. As described above, according to the automatic retransmission control method and the transmission device 60 therefor according to the fourth embodiment, the transmission device 60 has received the response signal before receiving all response signals a plurality of times. Based on the amplitude value of the response signal, the previous data can be retransmitted or the next data can be transmitted in a predetermined case. As a result, since determination can be performed without waiting for reception of all response signals, the time from response signal reception to response signal determination can be shortened, and communication efficiency can be improved.

[0069] Embodiment 5.

Next, Embodiment 5 will be described. The automatic retransmission control method and the transmission apparatus therefor according to the fifth embodiment have the same characteristics as those of the first embodiment, except that (l) the DTX region is divided into three regions, and If the amplitude value of the response signal falls within the area between the area near the predetermined threshold value determined as ACK and the area near the predetermined threshold value determined as NACK, the response signal is determined as intermediate DTX And (2) every time the transmitting device transmits to the receiving device, when the transmitting device receives a response signal of the same content from the receiving device multiple times, the transmitting device continues for a predetermined number of times. If all received response signal amplitude values are determined to be ACK or ACK-side DTX, the response signal is determined to be ACK without waiting for reception of all response signals, or a response signal received continuously a predetermined number of times. When all the amplitude values of NACK or NACK side DTX are judged The main feature is that the response signal is determined as NACK without waiting for all response signals to be received.

FIG. 13 is a block diagram illustrating a functional concept of the configuration of the communication system in the automatic retransmission control method according to the fifth embodiment. The structure and method that are not particularly described are the same as those in the first embodiment described above, and the same components are described with the same reference numerals. As shown in FIG. 13, the communication system includes a transmission device 70 and a reception device 40. Here, the transmission device 70 is configured to include a control unit 72 instead of the control unit 12 of the first embodiment. The control unit 72 is a control unit that performs encoding processing and channel coding processing on the generated data, decoding processing and channel coding processing on the demodulated response signal, and the like. The control unit 72 is configured to include a determination control unit 72a and a retransmission control unit 72b in terms of functional concept. Among these, the determination control unit 72a is a determination control means for performing determination control of the decoded response signal. Here, in the present embodiment, every time the transmitting device 70 receives a response signal from the receiving device 40, the determination control unit 72a sequentially stores the amplitude values of these response signals, and further receives them so far. Add the amplitude values of all response signals. Then, the determination control unit 72a determines the response signal from the result of adding the amplitude values of the response signals stored sequentially or the amplitude values of all the response signals received so far, and based on this result. Judgment control is performed.

[0072] The retransmission control unit 72b is retransmission control means for performing retransmission control of data. Specifically, when it is determined that the previous data has not been transmitted correctly based on the determination result in the determination control unit 72a, the retransmission control unit 72b retransmits the previously transmitted data to the receiving device 40, and Alternatively, if it is determined that the previous transmission has been performed correctly, this process is terminated, the process proceeds to the next process, and retransmission control is performed to transmit the next data.

Hereinafter, automatic retransmission control processing when data is transmitted from the transmission device 70 to the reception device 40 will be described. A flowchart of this process is shown in FIG. Here, the flow from step S501 force to step S506 is the same as the flow from step S301 to step S306 in FIG. 9 in the third embodiment, and the description thereof will be omitted below.

[0074] After receiving the response signal from the receiving device 40 in step S506, the determination control unit 72a of the transmitting device 70 sequentially stores the amplitude value of the response signal each time the response signal is received, and further stores this. The amplitude values of the same response signal received until then are added (step S507). In the next step 508, the determination control unit 72a determines whether or not the amplitude value of the response signal having the same content received M times is ACK or ACK side DTX continuously for a predetermined number of times (predetermined number of times N ≤ multiple times M). If the determination control unit 72a determines that the amplitude value of the response signal having the same content received M times is continuously ACK or ACK side DTX for a predetermined number of times, it determines that the response signal is ACK (step S508). Yes), in this case, it is considered that the previous transmission was performed correctly, so this process ends. In this case, it moves to the next processing and transmits the next data. On the other hand, if the determination control unit 72a does not determine the amplitude value S of the response signal having the same contents received M times, and ACK or ACK side DTX for a predetermined number of times (step S508, No), Then, the process proceeds to next step S509. In step S509, determination control unit 72a determines whether or not the amplitude value of the response signal having the same contents received M times is NACK or NACK side DTX continuously for a predetermined number of times. The determination control unit 72a determines that the response signal is NACK when the amplitude value of the response signal having the same contents received M times is determined to be NACK or NACK side DTX continuously for a predetermined number of times. (Step S509, Yes). In this case, since it is considered that the previous data is not transmitted correctly, the retransmission control unit 72b retransmits the previously transmitted data to the receiving device 40 (Step S501). . On the other hand, in step S509, if the determination control unit 72a does not continuously determine that the amplitude value of the response signal having the same content received M times is NACK or NACK side DTX for a predetermined number of times (step S509, No) Further, the process proceeds to the next step S510. The subsequent flow from step S510 to step S516 is the same as the flow from step S310 to step S316 in FIG. 9, and a description thereof will be omitted below.

[0076] Each time a response signal having the same content is received, the amplitude value of the response signal received so far is continuously transmitted a predetermined number of times at the NACK or NACK side DTX, which is the ACK or ACK side DTX. The reason for determining whether or not there is is as follows. That is, in the fourth embodiment, every time a response signal having the same content received multiple times is received, the transmitting device 60 determines that the amplitude value of the received response signal is ACK area Rll, NACK area R12, ACK side. We had to determine which of the five regions, DTX region R 33a, NACK side DTX region R33b, and intermediate DTX region R33c. On the other hand, in the fifth embodiment, the transmitting device 70 determines that the amplitude value of the received response signal is a region in which the ACK region Rl 1 and the ACK side DTX region R 33a are combined, the NACK region R12, and the NACK side DTX. It is only necessary to determine which of the three areas of the combined area R33b and the intermediate DTX area R33c.

As described above, according to the automatic retransmission control method and the transmission device 70 therefor according to the fifth embodiment, the transmission device 70 can reduce the case classification for determining the amplitude value of the received response signal. Since determination control can be performed quickly, the time until response signal determination can be shortened and communication efficiency can be improved.

[0078] Embodiment 6.

Next, Embodiment 6 will be described. The automatic retransmission control method according to the sixth embodiment and the transmission apparatus therefor have the same characteristics as those of the first to fifth embodiments. Further, the receiving apparatus receives the threshold value that is a reference when the transmitting apparatus divides the ACK area, the NACK area, and the DTX area and the threshold value that is a reference when the DTX area is divided into a plurality of areas. The main feature is that it is determined based on the reception quality of the response signal.

FIG. 15 is a block diagram illustrating a functional concept of the configuration of the communication system in the automatic retransmission control method according to the sixth embodiment. The structure and method that are not particularly described are the same as those in the first embodiment described above, and the same components are described with the same reference numerals. As shown in FIG. 15, the communication system includes a transmission device 80 and a reception device 20. Here, the transmission device 80 is configured to include a control unit 82 instead of the control unit 12 of the first embodiment. The control unit 82 is a control unit that performs encoding processing and channel coding processing on the generated data, decoding processing and channel coding processing on the demodulated response signal, and the like. In terms of functional concept, the control unit 82 includes a determination control unit 82a, a retransmission control unit 82b, and a division control unit 82c.

Among these, the determination control unit 82a is a determination control unit that performs determination control of the decoded response signal. Here, in the present embodiment, determination control unit 82a performs determination processing based on the response signal received from reception device 20. The retransmission control unit 82b is retransmission control means for performing retransmission control of data. Specifically, if the retransmission control unit 82b determines that the previous data has not been correctly transmitted based on the determination result of the response signal, the retransmission control unit 82b retransmits the previously transmitted data to the receiving device 20, or If it is determined that the previous transmission has been performed correctly, this process is terminated, and the process proceeds to the next process to perform retransmission control for transmitting the next data.

[0081] Here, the division control unit 82c receives the ACK determination threshold value Ni l, the N ACK determination threshold value N12, and the determination threshold value N13 in FIG. It is a division control means that is determined based on SIR (Signal Interference Ratio).

Hereinafter, automatic retransmission control processing when data is transmitted from the transmission device 80 to the reception device 20 will be described. A flowchart of this process is shown in FIG. Here, the flow from step S601 to step S606 is the same as the flow from step S101 to step S106 in FIG. 4 in the first embodiment, and description thereof will be omitted.

[0083] After receiving the response signal from the receiving device 20 in step S606, the transmission device 80 The split control unit 82c determines an ACK determination threshold value Nil, a NACK determination threshold value N12, and a determination threshold value N13 based on the reception quality of the response signal (step S607). For example, when the reception quality of the response signal is good, the division control unit 82c determines the determination threshold Ni l N13 to widen the ACK region R11 and the ACK side DTX region R13a, and when the response signal reception quality is bad, The determination threshold Nl 1 -N13 is determined so as to narrow the NACK region R12 or the NACK side DTX region Rl 3b. For example, measure the R value according to ITU recommendation G. 107, and if this R value is greater than a predetermined threshold, determine that the reception quality is good. Is smaller than a predetermined threshold, it is determined that the reception quality is poor. Then, the transmission device 80 performs determination control based on the determination threshold Ni l N13. The subsequent flow from step S608 to step S615 is the same as the flow from step S107 to step S114 in FIG. 4 and will not be described below.

As described above, conventionally, the transmission device 80 performs the determination of the response signal based on the predetermined determination threshold value Ni l−N 13. On the other hand, in the present invention, the determination threshold Ni l−N13 can be determined based on the reception quality of the response signal received from the reception device 20 by the division control unit 82c. Therefore, retransmission control can be performed more accurately based on the reception quality of the response signal received from the receiving device 20, and communication reliability can be improved.

As described above, each embodiment of the present invention has been described. However, specific configurations and methods of the present invention are arbitrarily modified and modified within the scope of the technical idea of each invention described in the claims. It can be improved. Hereinafter, such a modification will be described.

[0086] For example, the object for which the present invention is effective may be any communication method other than mobile communication, such as wireless communication, wired communication, and the like.

[0087] Further, the problems to be solved by the invention and the effects of the invention are not limited to the above-described contents, but the present invention solves the problems not described above or is described above. It is possible to achieve an effect that is not shown, or to solve only a part of the described problem or to display only a part of the described effect. For example, even if the reception efficiency has not been improved compared to the conventional case, if it is determined that the response signal is not an ACK and has been retransmitted in the past, if even part of the retransmission can be made unnecessary, this Invention The problem has been solved.

[0088] In addition, all or all of the control described as being automatically performed in each of the embodiments may be performed manually. Conversely, all of the control described as being performed manually is performed. Alternatively, an arbitrary part may be automated based on a known technique or the idea described above. In addition, the control unit and each processing block in the control unit shown in each embodiment can actually be configured as a CPU and a computer program that is read and executed by the CPU, or a hard-wired logic. Can be configured. Further, each of the electrical components described above is functionally conceptual and does not necessarily need to be physically configured as illustrated. In other words, the specific form of distribution / integration of each part is not limited to the one shown in the figure, and all or a part thereof is functionally or physically distributed in arbitrary units according to various loads or usage conditions, etc. Can be integrated and configured. In addition, the processing procedure or control procedure shown in the document or drawing can be arbitrarily changed unless otherwise specified.

In Embodiment 2-5, if the receiving apparatus does not receive data again within the predetermined time T1, the response signal to be retransmitted to the transmitting apparatus may be ACK, or the same ACK or N ACK The content may be retransmitted multiple times. In the second to fifth embodiments, the transmitting apparatus determines each determination threshold value used as a criterion for determining the response signal from the receiving apparatus based on the reception quality of the response signal described in the sixth embodiment. May be. Further, in Embodiments 1 to 16, the transmitting apparatus may divide the DTX region into the number of regions other than those described in each embodiment. For example, in Embodiment 1 or 6, the transmitting apparatus may divide the DTX region R13 into three or more regions. In the fourth or fifth embodiment, the transmission apparatus may divide the DTX region R13 into two regions or four or more regions. In Embodiment 2-5, the transmitting apparatus may divide DTX region R23 into three or more regions.

Industrial applicability

The present invention is useful as an automatic retransmission control method and an automatic retransmission control device for realizing highly reliable data transmission using automatic retransmission control in various communications such as mobile communication.

Claims

The scope of the claims

[1] After transmitting from the transmitting device to the receiving device, in the transmitting device, the amplitude value of the response signal received from the receiving device is lower than a predetermined threshold value for determining an affirmative response, and a negative response is received. An automatic retransmission control method for determining that the response signal is a non-determinable response when it falls in a region higher than a predetermined threshold value to be determined;

In the transmitter,

A division step of dividing an area determined to be an undecidable response into a plurality of areas; a reception step of receiving a response signal from the receiving apparatus after transmitting to the receiving apparatus;

When the amplitude value of the response signal received from the receiving device corresponds to a predetermined region close to a predetermined threshold value determined as the positive response among the divided regions, the response signal is acknowledged. A determination step that determines that the response signal is a negative response side determination impossible response when the response falls within a predetermined region close to a predetermined threshold value that is determined as a negative determination impossible response;

A retransmission step for performing different predetermined retransmission control when it is determined that the acknowledgment side determination impossible response or the negative response side determination impossible response is included. Method.

[2] In the division step, the area determined as the undecidable response is defined as a first intermediate area close to a predetermined threshold value determined as the positive response, and a predetermined threshold value determined as the negative response. Divided into three regions: a second intermediate region closer to each other, and a third intermediate region between the first intermediate region and the second intermediate region,

In the determination step, when the amplitude value of the response signal corresponds to the third intermediate region, the response signal is determined as an intermediate determination impossible response;

The automatic retransmission control method according to claim 1, wherein:

[3] In the dividing step, determining the predetermined threshold or a threshold serving as a reference for performing the division based on reception quality of the response signal;

The automatic retransmission control method according to claim 1, wherein:

[4] If it is determined in the determination step that the acknowledgment side determination is impossible, If the response signal is received again from the receiver within a predetermined time, the first response signal is determined as a negative response,

If the response signal is not received again from the receiver within a predetermined time, the initial response signal is determined as an affirmative response;

The automatic retransmission control method according to claim 1, wherein:

[5] In the receiving step, each time transmission is performed to the receiving device, a response signal having the same content is received a plurality of times from the receiving device,

In the determination step, after the response signal having the same content is received a plurality of times, the amplitude values of all the response signals are added, and the determination is performed based on the addition result. Item 2. The automatic retransmission control method according to Item 1.

[6] In the receiving step, each time transmission is performed to the receiving device, a response signal having the same content is received a plurality of times from the receiving device,

In the determination step, every time the response signal having the same content is received, the amplitude values of all the response signals received so far are added, and if the determination can be made based on the addition result, all response signals are received. Making a decision without waiting for a signal to be received,

The automatic retransmission control method according to claim 1, wherein:

[7] In the receiving step, each time transmission is performed to the receiving device, a response signal having the same content is received a plurality of times from the receiving device,

In the determination step, when it is determined that all of the response signals continuously received a predetermined number of times are responses that cannot be determined as an affirmative response, the response signals that do not wait for reception of all response signals are regarded as positive responses. If all of the above response signals that have been judged or received consecutively for a predetermined number of times are judged to be negative response side undecidable responses, the response signals that do not wait for reception of all response signals are negatively acknowledged. To determine,

The automatic retransmission control method according to claim 1, wherein:

[8] In the determination step, if the acknowledgment is received even once, the response signal that does not wait for reception of all response signals is determined as an acknowledgment, or the negative response is received once. However, if it is received, it is determined that the response signal is a negative response without waiting for reception of all response signals. The automatic retransmission control method according to claim 7, wherein:

[9] In the receiving step, each time transmission is performed to the receiving device, a response signal having the same content is received a plurality of times from the receiving device,

In the determination step, when it is determined that all of the response signals continuously received a predetermined number of times are an affirmative response or an affirmative response determination failure response, the response signal without waiting for reception of all response signals is displayed. If it is determined that the response signal is an affirmative response, or if the response signals received continuously a predetermined number of times are all negative responses or negative response side determination impossible responses, the response without waiting for reception of all response signals. Determining the signal as a negative response,

The automatic retransmission control method according to claim 1, wherein:

[10] After transmission to the receiving device, the amplitude value of the response signal received from the receiving device is lower than a predetermined threshold value for determining an affirmative response and a predetermined threshold value for determining a negative response. A transmitter that performs automatic retransmission control to determine that the response signal is an undecidable response when it falls in a high region,

A receiving means for receiving a response signal from the receiving apparatus after transmitting to the receiving apparatus;

The amplitude value of the response signal received from the receiving device by the receiving unit is close to a predetermined threshold value for determining the positive response among a plurality of regions set by dividing the region determined to be the undecidable response. If the response signal falls within the predetermined area, the response signal is determined as an affirmative response determination failure response. If the response signal falls within the predetermined area close to the predetermined threshold value, the response signal is denied. A judgment control means for judging that the response side cannot be judged, and

When the determination control means determines that the acknowledgment side determination impossible response, or when the determination control means determines that the negative response side determination impossible response, retransmission control means that performs different predetermined retransmission control, respectively,

A transmission device comprising:

[11] The area determined as the undecidable response includes a first intermediate area close to a predetermined threshold value determined as the positive response, and a second intermediate area close to a predetermined threshold value determined as the negative response. These are divided into three regions, a third intermediate region between the first intermediate region and the second intermediate region,

The determination control means determines that the response signal is an intermediate determination impossible response when the amplitude value of the response signal corresponds to the third intermediate region;

The transmitter according to claim 10, wherein:

[12] Division control means for determining the predetermined threshold or a threshold serving as a reference for performing the division based on reception quality of the response signal;

The transmitter according to claim 10, further comprising:

[13] When the determination control means determines that the acknowledgment side determination impossible response,

If the response signal is received again from the receiver within a predetermined time, the first response signal is determined as a negative response,

The transmitter according to claim 10, wherein:

[14] Each time the receiving means performs transmission to the receiving device, the receiving means receives a response signal having the same content from the receiving device multiple times,

The determination control means, after receiving the response signal having the same content a plurality of times, adds the amplitude values of all the response signals, and makes a determination based on the addition result;

The transmitter according to claim 10, wherein:

[15] Each time the receiving means performs transmission to the receiving device, the receiving means receives a response signal of the same content from the receiving device multiple times,

Each time the determination control means receives the response signal having the same content, it adds the amplitude values of all the response signals received so far, and when all can be determined based on the addition result, Make a decision without waiting for the response signal

The transmitter according to claim 10, wherein:

[16] Each time the receiving means transmits to the receiving device, the receiving means receives a response signal having the same content from the receiving device a plurality of times,

The determination control means confirms that all the response signals received continuously a predetermined number of times are positive. If it is determined that the response cannot be determined on the constant response side, the response signal is determined as an affirmative response without waiting for reception of all response signals, or the response signal received continuously a predetermined number of times is not received. When all the negative response side determination is impossible, the response signal without waiting for reception of all response signals is determined as a negative response.

The transmitter according to claim 10, wherein:

[17] When the acknowledgment is received even once, the determination control means determines that the response signal without waiting for reception of all response signals is an affirmative response, or the negative response is If it is received even once, it is determined that the response signal without waiting for the reception of all response signals is a negative response,

The transmission device according to claim 16, wherein:

[18] The reception unit receives a response signal having the same content from the reception device a plurality of times each time transmission is performed to the reception device.

The determination control means, when it is determined that all the response signals continuously received a predetermined number of times are an affirmative response or an affirmative response determination failure response, the response without waiting for reception of all response signals. If it is determined that the signal is an affirmative response, or if all of the response signals received consecutively a predetermined number of times are a negative response or a negative response side undecided response, wait for reception of all response signals. Determining that the response signal is a negative response,

The transmitter according to claim 10, wherein: