JP2006352199A - Wireless transceiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transceiver whereby a transmission side user can select a transmission method in response to a state of channel and the transmission efficiency of which can be enhanced by solving problems of a conventional transceiver that has a bad transmission efficiency because the conventional transceiver cannot transmit succeeding data until a defective receiver normally completes reception of data on the occurrence of a transmission error resulting in that the conventional transceiver takes much time for transmitting all the data in the case of transmitting the data to a plurality of receivers. <P>SOLUTION: The transceiver disclosed herein is provided with a modulation demodulation section 2, the control section 24 of which includes: a first transmission control means that shifts to transmission of a succeeding block on the occurrence of retransmission time-out; a second transmission control means that releases a line to stop transmission on the occurrence of the retransmission time-out; and a third transmission control means that transmits a telegram message inspection request after all the blocks are transmitted, wherein a key entry section 33 can select any of the transmission control means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a wireless transmitter / receiver that transmits and receives data via a wireless line, and in particular, includes a plurality of data transmission methods with different data retransmission methods when a transmission error occurs, and transmits using any of the transmission methods. It is related with the radio | wireless transmitter / receiver which enables a transmission side user to select whether to perform and can improve the efficiency of data transmission.

In wireless transceivers that transmit and receive data (for example, packets) using a conventional wireless transmission path, data retransmission is widely performed to compensate for transmission errors.
A conventional data transmission method including data retransmission (automatic retransmission) will be described.
When the transmitting side wireless transceiver (hereinafter referred to as a transmitting apparatus) transmits data, it subsequently transmits a “message check request” to confirm whether or not the data has been normally received, and the receiving side wireless transceiver In response to the electric inspection request, the transmitter / receiver (hereinafter referred to as a receiving device) returns a “message check result” indicating whether or not the reception result has been normally received to the transmitting device. Then, the transmission device refers to the returned electronic message inspection result, and transmits the data again when it cannot be normally received.

  When there are a plurality of receiving devices, the transmitting device transmits data and a message check request to each receiving device, and based on the message checking result returned from each receiving device, the receiving device that could not be received normally If there is, the data is retransmitted to all receiving apparatuses or receiving apparatuses that could not be normally received. Then, retransmission is repeated until reception is completed normally in all receiving apparatuses. In this way, the conventional data transmission method has been performed.

Incidentally, as a conventional technique of a transmission apparatus for transmitting packet data, Japanese Patent Laid-Open No. 10-70523 “Packet transmission method and apparatus” published on March 10, 1998 (Applicant: Kokusai Electric Inc., Inventor: Eiji Yokokawa).
In this prior art, when a transmission error occurs, the reception side creates a reception error map in which the error state is converted into a bitmap corresponding to the transmission sequence number and transmits an acknowledgment, and the transmission side that receives the response receives it. By looking at the error and extracting and retransmitting only the packet in which the error has occurred, it is possible to prevent duplicate retransmission of the packet and efficiently transmit the packet data.

JP-A-10-70523 (page 3-5)

  However, in the conventional wireless transceiver, when a transmission error occurs when transmitting data to a plurality of receiving devices at the same time, the next data is transmitted until the receiving device with poor reception completes reception normally. Therefore, it takes time to transmit all the data, and there is a problem that transmission efficiency is low.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a radio transceiver capable of improving the efficiency of data transmission.

  The present invention for solving the above-described problems of the conventional example includes a transmitter / receiver for transmitting / receiving a radio signal, a modulator / demodulator for controlling transmission / reception in the transmitter / receiver, and a key input for a user to input an instruction. And a display unit for displaying data, the modulator / demodulator transmits a data block of transmission data to a plurality of receiving devices, and the data block cannot be received normally If there is a receiving apparatus, the data block is retransmitted if the number of retransmissions of the data block retransmitted is less than the prescribed number, and if the number of retransmissions is equal to or greater than the prescribed number, the process proceeds to transmission of the next data block. If there is a transmission control means and a receiving device that transmits a data block of transmission data to a plurality of receiving devices, and there is a receiving device that has not received the data block normally, If the number of retransmissions of the data block is equal to or greater than the prescribed number, the line is released and the second transmission control means for displaying on the display section that the data has not been normally received and all the data blocks of the transmission data are transmitted to the receiving device After that, a message inspection request for confirming whether or not the message has been normally received is transmitted, and a message inspection result in response to whether or not the message has been normally received in response to the message inspection request is received from each of the plurality of receiving devices. And a third demodulator having a third transmission control means for displaying the result of transmission on the display unit for each receiving device, wherein the key input unit is one of the first to third transmission control means. It is a key input part to select.

  According to the present invention, when a modem transmits a data block of transmission data to a plurality of receiving apparatuses, and there is a receiving apparatus that has not been able to receive the data block normally, a retransmission in which the data block is retransmitted If the number of times is less than the specified number of times, the data block is retransmitted. If the number of retransmissions is equal to or greater than the specified number of times, the first transmission control means shifts to the transmission of the next data block, If there is a receiving device that sent a block and was not able to receive the data block normally, if the number of retransmissions of the data block is equal to or greater than the specified number, the line was released and the message was not received normally Second transmission control means for displaying the message on the display unit, and a message check for confirming whether or not the data block of the transmission data has been normally received after transmitting all the data blocks of the transmission data to the receiving device A request is transmitted, and a message inspection result is sent from each of the plurality of receiving devices to respond whether or not the message has been received normally in response to the message checking request, and the transmission result is displayed on the display unit for each receiving device. A modem having a third transmission control unit, and the key input unit is a radio transceiver that is a key input unit for selecting any one of the first to third transmission control units. If the transmission condition is not so good, the first or second transmission control means is selected to prevent wasting time for unnecessary retransmission, and if the line state is good, the third transmission control means is selected to select a message check request and message. The time required for transmission / reception of the inspection result can be greatly reduced, and the transmission side user can select an appropriate transmission control means according to the line state and the like, so that the data transmission efficiency can be improved.

Embodiments of the present invention will be described with reference to the drawings.
The radio transceiver according to the present invention is provided with a transmission control means for realizing a data transmission method having a plurality of different retransmission schemes, and a transmission-side user can select an arbitrary retransmission scheme according to a line state or the like. The transmission time can be shortened, and the transmission efficiency when data is transmitted to a plurality of receiving apparatuses can be improved.

FIG. 1 is a schematic configuration diagram of a wireless transmission / reception system using a wireless transmission / reception device (this device) according to an embodiment of the present invention.
As shown in FIG. 1, radio transceivers 10a and 10b according to an embodiment of the present invention include a transceiver 1 that transmits and receives radio signals, and a modem 2 that modulates transmission data and demodulates reception data. And an operation terminal unit 3 on which a user performs key input operations and displays data.

When wireless data transmission / reception is performed between the wireless transceiver 10a and the wireless transceiver 10b, data (for example, mail data) input from the operation terminal unit 3 of the transmitting wireless transceiver is modulated by the modem 2. The radio signal transmitted from the transceiver 1 is received by the transceiver 1 of the receiving side radio transceiver, and then demodulated by the modem 2 and displayed on the operation terminal unit 3.
It is also possible to transmit the same data all at once from a single transmitting-side radio transceiver (transmitting device) to a plurality of receiving-side radio transceivers (receiving devices).

Next, a specific configuration of the wireless transceiver according to the embodiment of the present invention will be described with reference to FIG. FIG. 2 is a configuration block diagram of the apparatus.
As shown in FIG. 2, the present apparatus (wireless transceiver 10) includes a transceiver 1, a modem 2, and an operation control unit 3, and the transceiver 1 further includes a transmitter 11 and a receiver 12. It consists of and.
The operation terminal unit 3 includes an operation control unit 31, a display unit 32, and a key input unit 33.
The modem 2 includes a modulation unit 21, a demodulation unit 22, a ROM 23, a control unit 24, a RAM 25, and an RS-232C level conversion unit 26.

Each component will be specifically described.
A transmitter 11 of the transceiver 1 outputs a signal input from the modem 2 to a wireless line.
The receiver 12 of the transceiver 1 receives a signal transmitted via a wireless line and outputs it to the modem 2.

The modulation unit 21 of the modem 2 modulates transmission data input from the control unit 24 using a specified modulation method.
The demodulator 22 demodulates the received data input from the receiver 12 of the transceiver 1 using a demodulation method corresponding to the modulation method.

  The ROM 23 is a storage unit that stores a processing program in the control unit 24 of the modem 2. In particular, the ROM 23 of this apparatus includes a data transmission processing program corresponding to first to third transmission processing means of the control unit 24 described later.

The control unit 24 performs processing associated with control of the entire modem 2 and is configured by an MPU (Micro Processor Unit) or the like. The control unit 24 activates a program stored in the ROM 23 in accordance with data from the operation terminal unit 3 or the transceiver 2 to control serial data transmission / reception between the wireless transceivers. 3 transmission control means.
As will be described later, the first, second, and third transmission control means perform transmission processes with different retransmission methods, and each transmission processing means uses the corresponding program stored in the ROM 23 as an MPU. It is a processing means that performs a specific process by expanding on the memory.

  And in this apparatus, the processing program of the transmission control means corresponding to the transmission method designated by the operation terminal unit 3 and held in the RAM 24 out of the three types of transmission methods realized by the three types of transmission control means. And data transmission according to the transmission method designated by the user is performed.

  The RAM 25 temporarily stores necessary data during the processing of the control unit 24 and stores various setting data. In the RAM 25 of this apparatus, a transmission method designated by the user from the operation terminal unit 3 is stored.

  The RS-232C level conversion unit 26 is an interface that performs level conversion between the operation terminal unit 3 and the control unit 24.

Next, the data transmission method of this apparatus will be described.
This device transmits data input from the operation terminal unit 3 in the same manner as a conventional wireless transceiver, and includes three different transmission control means depending on the retransmission method as described above. The transmission side user can arbitrarily set / change which transmission control means is selected, that is, which transmission method is used for transmission. Here, the first to third transmission methods (transmission types) can be set. The “selection of transmission control means” described in the claims corresponds to “selection of transmission method” in the embodiment.

  As a method for setting / changing the transmission method, for example, a function menu is displayed on the display unit 32 by an operation from the key input unit 33 of the operation terminal unit 3, and a function for selecting a transmission method from the function menu is designated. A desired transmission method is designated. The designated transmission method is stored in a specific area of the RAM 25 by the control unit 24. Note that any one of the transmission methods may be stored in the RAM 25 as a default in advance.

Each data transmission method will be specifically described.
FIG. 3 is a sequence explanatory diagram of the first transmission method of the present apparatus. Here, in order to simplify the description, two receiver-side radio transceivers are used.
The first transmission method is realized by the first transmission control means, and even if retransmission is performed more than a predetermined number of times set in advance in the transmission apparatus, reception was not successful (hereinafter referred to as “retransmission timeout”). If there is a receiving device, the transmission method is such that the transmission of the data is terminated and the transmission of the next data is started.

  As shown in FIG. 3, when transmission data is input from the operation terminal unit of the transmission-side radio transceiver (shown as “transmission-side operation terminal unit” in the figure), the modem (see FIG. The "transmission-side modem" describes the first block of transmission data addressed to the two specified receivers, and the modems of the two radio transceivers on the reception side ("Reception-side" in the figure) The modem (1) "and the" receiving-side modulator / demodulator (2) "receive it.

  Subsequently, the transmission side modem / demodulator transmits a message check request for confirming whether or not the transmission data is normally received, and the reception side modem / demodulator (1) and the reception side modem (2) receive this. Then, a message check result indicating whether or not the transmission data of the first block has been normally received is returned. Here, the reception side modulator / demodulator (1) responds “OK” because it has been received normally, and the reception side modem (2) has returned “NG” because it has not been received normally.

  Then, the transmission-side modulator / demodulator confirms the result when receiving the message check result, and if “NG” is present, performs a time-out determination for determining whether or not the retransmission has been performed a predetermined number of times or more. The specified number of times is preset in the RAM 25 by an input from the operation terminal unit 3 or by default, and is “2” (not shown) in the example of FIG. In this case, since retransmission has not been performed yet, the number of retransmissions is less than the specified number, and the transmission-side modulator / demodulator sends the data of the first block to the reception-side modem (1) and reception-side modem (2). Will be resent.

  Then, as with the first transmission, a message check request and message check result are transmitted / received. If “NG” is detected again, a timeout determination is made. If the determination result is “OK”, the data is further retransmitted. Do.

As a feature of the first transmission method, when retransmission is performed more than the specified number of times (in this case, twice), that is, when the retransmission timeout determination is “NG”, the message check result has “NG”. In this case, no further retransmission is performed, and the next data (second block data) is transmitted.
In this way, the first transmission control means of this apparatus sets an upper limit on the number of retransmissions and transmits the next data without further retransmissions. It is possible to prevent the transmission time from being unnecessarily extended and to shorten the time required to transmit all data. Further, if the specified number of times is set to be small according to the importance of data, the efficiency can be further improved.

Here, the processing of the first transmission control means of this apparatus will be described with reference to FIG. FIG. 4 is a flowchart showing the processing of the first transmission control means in the control unit of the transmission side modulator / demodulator of this apparatus.
As shown in FIG. 4, when an instruction for data transmission is input from the operation terminal unit 3, the first transmission control means sets the number of retransmissions stored in the internal work area to 0 (100). The data of the first block is transmitted on the receiving side (102). Then, the first transmission control means transmits a message check request (104), and receives and checks the message check result (106).

  Then, the first transmission control means determines whether or not all the received electronic message inspection results are “OK” (108), and if all are “OK” (in the case of Yes), the process proceeds to processing 120. It is determined whether or not transmission of all input transmission data has been completed (120). If all transmission has been completed, the process ends.

  If transmission of all transmission data has not been completed, the first transmission control unit returns to process 100 and repeats the same process for the next data.

  In the process 108, when all the electronic message inspection results are not “OK”, the first transmission control means determines whether or not the stored number of retransmissions is less than the prescribed number (110). If the number of retransmissions is less than the prescribed number (in the case of Yes), the first transmission control means increments (+1) the stored number of retransmissions (112) and proceeds to process 102 to retransmit the same data To do.

  If the number of retransmissions is greater than or equal to the specified number in process 110 (in the case of No), the first transmission control means ends the transmission of the data and proceeds to process 120 to transfer the next data. Move on to transmission. In this way, the first transmission method by the first transmission control means of the present apparatus is performed.

Next, the second transmission method of this apparatus will be described with reference to FIG. FIG. 5 is a sequence explanatory diagram of the second transmission method of the present apparatus.
The second transmission method of this apparatus is realized by the second transmission control means. If any one of the plurality of receiving apparatuses has a retransmission timeout, the line is disconnected at that time. Thus, the transmission is terminated, and a message indicating that the transmission is interrupted is displayed on the operation terminal unit on the transmission side.
As shown in FIG. 5, the second transmission method of the present apparatus transmits a message check request every time the transmission-side modulator / demodulator transmits one data, similarly to the first transmission method shown in FIG. In response to this, the receiver-side modulator / demodulator returns a message check result.

  If the message check result is “NG”, the transmitter-side modem makes a retransmission timeout determination as to whether or not the number of retransmissions is less than the specified number, and if the determination result is “OK”, Resend the data. Here, if the determination result of the retransmission timeout determination is “NG”, the transmission side modulator / demodulator transmits a line release to the reception side modem (1) and the reception side modem (2) to disconnect the line. Then, the fact that the transmission is interrupted is displayed on the display unit 32 of the operation terminal unit 3 as a delivery result. Here, “release the line” means to disconnect the line and stop transmission.

The user on the transmission side looks at this delivery result, recognizes that the data transmission has not been performed normally, and inputs a transmission instruction from the operation terminal unit 3 again. At that time, a modulation scheme having a lower transmission rate may be selected.
If a retransmission timeout occurs, it is possible that the transmission path condition is quite bad or a failure has occurred on the receiver side. If the transmission process is continued until it takes a long time. The second transmission method is to prevent such unnecessary retransmission, and prompts the user to take measures such as reducing the transmission speed by recognizing that there is a possibility that the current transmission method cannot be transmitted normally. Is something that can be done.

Next, the processing of the second transmission control means of this apparatus will be described with reference to FIG. FIG. 6 is a flowchart showing processing of the second transmission control means in the transmission-side modulator of the present apparatus.
As shown in FIG. 6, processes 200 to 212 in the process of the second transmission control means are the same as the processes of the first transmission control means shown in FIG.
In the process 210, when the number of retransmissions is not less than the specified number (in the case of No), that is, when retransmission is performed more than the specified number, the second transmission control means transmits a line release (220) and transmits data Is displayed (222), and the process ends. In this way, the processing of the second transmission control means is performed.

Next, a third transmission method of the present apparatus will be described with reference to FIG. FIG. 7 is an explanatory diagram of the sequence of the third transmission method of the present apparatus.
The third transmission method of this apparatus is realized by the third transmission control means, and is a method that does not perform automatic retransmission of data.
The first and second transmission control means transmit a message check request every time a data block of transmission data is transmitted. On the other hand, as shown in FIG. The modem on the transmission side (third transmission control means) continuously transmits all data blocks (here, n blocks), and does not transmit a message check request until all data is transmitted.

  Then, the transmission side modem (third transmission control means) transmits a message check request only once when transmission of all data is completed. The reception side modem (1) and the reception side modem (2) transmit a message check result indicating whether or not all data has been normally received in response to the message check request. Here, the message check result transmitted from each receiving device includes identification data indicating each receiving device.

Upon receiving the electronic message inspection result, the transmission side modem (third transmission control means) receives each of the identification data and the data indicating whether the reception is normal or not as a delivery result on the display unit 32 of the operation terminal unit 3. Whether or not the reception is normally performed is displayed for each receiving device.
If there is a receiving device that could not be received normally, the user on the transmission side inputs an instruction to transmit to the receiving device separately and transmits the data again. Good.

Thus, the third transmission control means transmits all the blocks of the transmission data, and transmits the message check request after transmitting all the data, so the message check request required for each block. In addition, the time required for transmission / reception of the electronic message inspection result is unnecessary, and the efficiency of data transmission can be greatly improved.
The third transmission method realized by the third transmission control means is an effective transmission method when it is expected that the line state is good and that there are few transmission errors.

  According to the radio transceiver according to the embodiment of the present invention, the control unit 24 of the modem 2 has the first transmission control means for controlling the data transmission in the first to third transmission methods different from each other. The transmission control means and the third transmission control means are provided, and when the first transmission control means transmits a data block of transmission data, a message inspection request is transmitted, and a reception device that cannot be normally received as a result of the message inspection is provided. If there is, it is determined whether or not the number of retransmissions of the data block is greater than or equal to the specified number. If the number of retransmissions is less than the specified number, the retransmission is performed. When the first transmission method is realized and the second transmission control means transmits a data block of transmission data and transmits a message check request, and there is a receiving device that cannot be normally received as a result of the message check, Day It is determined whether or not the number of retransmissions for resending the block is equal to or greater than the specified number of times. If the number of retransmissions is equal to or greater than the specified number of times, the line is released and Realizing the method, the third transmission control means transmits the data check request after transmitting all the data blocks of the transmission data, and displays a delivery result indicating whether or not each reception device has received normally The third transmission method to be displayed on the unit 32 is realized, and the transmission method selected from the key input unit 33 of the transmission side wireless transceiver is stored in the RAM 25 among the three types of transmission control means. In addition, the transmitter / receiver controls the data transmission by the transmission control means corresponding to the transmission method stored in the RAM 25 at the time of data transmission, and the transmission side user can arbitrarily select the transmission method, and the state of the transmission path But If the receiver side transmitter / receiver is in poor condition, the transmission time can be prevented from being prolonged by selecting the first or second transmission method and repeating unnecessary retransmission. The data can be transmitted reliably by taking measures such as changing the transmission speed, and if the transmission path is in good condition, the third method is selected and a message check request for each data block is selected. This eliminates the time required to send and receive electronic message inspection results, and can significantly reduce the time required for data transmission and improve the efficiency of data transmission. The transmission method can be selected according to the state of the transmission line. There is an effect that data can be transmitted well and reliably.

  Note that the radio transceiver according to the present embodiment improves the data transmission efficiency particularly remarkably when there are a plurality of devices on the receiving side, and such a case has been described as an example. Even if there is only one device, the transmission time can be shortened in the same manner, and the transmission efficiency can be improved.

  The present invention comprises a plurality of data transmission methods having different data retransmission methods when a transmission error occurs, and allows the transmission side user to select which transmission method to use to improve the efficiency of data transmission. The present invention relates to a wireless transceiver that can be improved.

It is a schematic block diagram of the radio | wireless transmission / reception system using the radio | wireless transmitter / receiver (this apparatus) which concerns on embodiment of this invention. It is a block diagram of the present apparatus. It is sequence explanatory drawing of the 1st transmission method of this apparatus. It is a flowchart figure which shows the process of the 1st transmission control means in the control part of the transmission side modulator / demodulator of this apparatus. It is sequence explanatory drawing of the 2nd transmission method of this apparatus. It is a flowchart figure which shows the process of the 2nd transmission control means in the transmission side modulator of this apparatus. It is sequence explanatory drawing of the 3rd transmission method of this apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Transmitter / receiver, 2 ... Modulator / demodulator, 3 ... Operation terminal part, 11 ... Transmitter, 12 ... Receiver, 21 ... Modulator part, 22 ... Demodulator part, 23 ... ROM, 24 ... Control part, 25 ... RAM, 26 ... RS-232C level conversion unit, 31 ... operation control unit, 32 display unit ..., 33 ... key input unit

Claims (1)

A radio transceiver comprising: a transceiver that transmits and receives radio signals; a modem that controls transmission and reception in the transceiver; a key input unit for a user to input an instruction; and a display unit that displays data. ,
The modem is
If there is a receiving device that transmits a data block of transmission data to a plurality of receiving devices and the data block is not received normally, the data is retransmitted if the number of retransmissions of the data block is less than a specified number. A first transmission control means for retransmitting a block and shifting to transmission of the next data block if the number of retransmissions is equal to or greater than the specified number of times;
When a data block of transmission data is transmitted to multiple receiving devices and there is a receiving device that has not received the data block normally, the line is released if the number of retransmissions of the data block exceeds the specified number. A second transmission control means for displaying on the display section that the message has not been normally received;
After transmitting all the data blocks of the transmission data to the receiving device, transmit a message check request for confirming whether or not the data has been normally received, and respond whether or not the message has been normally received in response to the message check request. A modulator / demodulator comprising: a third transmission control unit that receives a message inspection result from each of the plurality of receiving devices and displays a transmission result for each of the receiving devices on the display unit;
The radio transceiver according to claim 1, wherein the key input unit is a key input unit that selects one of the first to third transmission control means.

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