JPH0969828A - Radio equipment for data transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide data transmission, in which the number of times of data retransmission is decreased and a transmission time loss is reduced, by changing a data channel being used at present to a call originating station by a data channel change discrimination part when the stored number of times of retransmission requests exceeds a prescribed value. SOLUTION: At a call originating station 1, a new standby data channel 2 is detected by carrier sensor at a standby data channel detection part 134 based on a received control signal, and control signal for instructing the data channel 2 is generated by a transmission signal generating part 133. Then, the call originating station transmits the control signal from a transmission part 12 through a control channel to a station 2 to be called. Based on the received control signal, the station 2 to be called transmits the usage of data channel 2 to the call originating station 1 and resets the numerical value stored in a data retransmission request frequency storage part 235 to '0'. The call originating station 1 transmits data 1 while using the channel 2. Since this channel 2 is not interferred by the other radio wave, the station 2 can receive the data 1 well and transmits the success of transmission to the call originating station 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission radio equipment used for radio transmission of data between a calling station side and a called station side.

[0002]

2. Description of the Related Art In recent years, wireless equipment for data transmission for transmitting and receiving data wirelessly has been used in various fields.

A conventional radio equipment for data transmission will be described below with reference to the drawings. FIG. 6 is a block diagram showing a configuration of a conventional data transmission radio equipment. In the figure, this radio equipment for data transmission includes a calling station 1 and a called station 2.
It is composed of The calling station 1 receives a radio wave and demodulates it into a digital signal, a control section 13 that processes the demodulated digital signal and performs control, and a digital signal output from the control section 13 into a radio wave. It is composed of a transmitter 12 that modulates and emits. The called station 2 also includes a receiving unit 21 that receives radio waves and demodulates them into digital signals, a control unit 23 that processes the digital signals after demodulation and performs control.
The transmission unit 22 modulates the digital signal output from the control unit 23 into an electric wave and emits the electric wave. As can be seen from the figure, the calling station 1 and the called station 2 are transmitting / receiving devices having the same configuration, and in the case where two transmitting / receiving devices constitute one set of wireless equipment for data transmission, The calling station 1 is used and the other is called station 2. Further, the control unit 13 of the calling station 1 and the control unit 23 of the called station 2 have the same configuration.

The control unit 13 of the calling station 1 detects an error bit of the digital signal demodulated by the receiving unit 11 and corrects the error bit, and an error bit detection / correction unit 131 for obtaining a control signal and data. The error bit detection / correction unit 131
Data retransmission request determination unit 132 that determines whether or not to request data retransmission based on the output of the above, a transmission signal generation unit 133 that converts data to be transmitted into a digital signal, and an empty data channel is detected by carrier sense. The empty data channel detection unit 134. The same applies to the control unit 23 of the called station 2, and error bit detection / correction is performed to detect and correct error bits of the digital signal demodulated by the reception unit 21 and to obtain control signals and data. Unit 231 and the error bit detection / correction unit 23
A data retransmission request determination unit 232 that determines whether to request data retransmission based on the output of 1, a transmission signal generation unit 233 that converts data to be transmitted into a digital signal, and an empty data channel is detected by carrier sense. And an empty data channel detection unit 234 that operates.

The operation of the above configuration will be described. FIG. 7 is a protocol diagram showing the line connection operation of the conventional data transmission radio equipment. In the figure, the calling station 1 detects an empty data channel by the empty data channel detection unit 134 and performs carrier sense of the control channel. If the control channel is empty, the connection request signal and the data channel are sent using the control channel. The designated signal is transmitted to the called station 2.
Receiving these signals, the called station 2 transmits a connection response signal to the calling station 1 as a response to the received connection request.
In this way, a data transmission line is established between the calling station 1 and the called station 2.

After that, data transmission is performed between the calling station 1 and the called station 2 using the data channel detected by the calling station 1. When the data transmission is completed, the calling station 1 sends an end signal to the called station 2, and the called station 2 sends a response signal to the calling station 1 in response to the received ending signal. When the calling station 1 receives the response signal, the data transmission line between the calling station 1 and the called station 2 is released. Further, the data channel cannot be changed until the data transmission line between the calling station 1 and the called station 2 is released.

In the above line connection procedure, the calling station 1
Converts the data transmitted by the transmission signal generation unit 133 into a digital signal, modulates the digital signal of the transmission unit 12 into a radio wave, and transmits the radio wave to the called station 2. The called station 2 demodulates the radio wave received by the receiving section 21 into a digital signal and detects an error bit.
The correction unit 231 detects the number of error bits of the digital signal, and when the number of error bits is within the error correction capability range,
While correcting the error bit, the transmission signal generation unit 233 generates a control signal for instructing the calling station 1 of successful transmission.
When the number of error bits exceeds the error correction capability, the data retransmission request determination unit 232 determines data retransmission, and the transmission signal generation unit 233 generates a control signal instructing the calling station 1 to retransmit the data. The transmission unit 22 modulates a control signal indicating either the successful transmission or the resend request into an electric wave and transmits the electric wave to the calling station 1.

[0008]

In such a conventional radio equipment for data transmission, for example, a calling station 1 and a called station 2 are used.
The number of data retransmissions increases when the data channel used in is affected by the interference of different kinds of radio waves or is affected by the adjacent data channel being used in another line. FIG. 8 shows an operation example of the wireless equipment for data transmission in this case.
It should be noted that FIG. 8 shows a case where the data transmitted from the calling station 1 to the called station 2 is two, that is, data 1 and data 2. Since the data channel used between the calling station 1 and the called station 2 is currently receiving interference from other radio waves, there are many bit errors, and the called station 2 is Data 1
, And data 2 are requested twice. As described above, there is a problem that the number of times of data retransmission is large in the currently used data channel and the data transmission time becomes long.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a radio equipment for data transmission, which can reduce the number of data retransmissions and can shorten the data transmission time.

[0010]

According to a first aspect of the present invention, there is provided a receiving section for receiving a radio wave and demodulating it into a digital signal,
An error bit detection / correction unit that detects and corrects error bits of the demodulated digital signal to obtain a control signal and data, and requests data retransmission based on the output of the error bit detection / correction unit. A data retransmission request determination unit that determines whether or not a transmission signal generation unit that adds a control signal to the data to be transmitted and converts it into a digital signal, and modulates the digital signal converted by the transmission signal generation unit into radio waves. A transmitting section for emitting a data retransmission request, an empty data channel detecting section for detecting an empty data channel by carrier sense, a data retransmission request number storage section for storing the number of times the data retransmission request determining section requests data retransmission, and And a data channel change determination unit that determines whether to change the currently used data channel based on the number of requests. It is provided as a calling station and a called station, and in the called station, the data retransmission request determination unit sends data to the calling station when the number of error bits detected by the error bit detection / correction unit exceeds the number of correctable bits. Request to resend
The data channel change determination unit is a data transmission radio equipment that causes the calling station to change the currently used data channel when the stored number of retransmission requests exceeds a predetermined value. The present invention according to item 2,
A receiver for receiving radio waves and demodulating into a digital signal; an error bit detector / corrector for detecting and correcting error bits of the demodulated digital signal to obtain a control signal and data; A data retransmission request determination unit that determines whether to request data retransmission based on the output of the detection / correction unit, a transmission signal generation unit that adds a control signal to the data to be transmitted and converts it into a digital signal, and the transmission A transmission unit that modulates the digital signal converted by the signal generation unit into an electric wave and emits it, an empty data channel detection unit that detects an empty data channel by carrier sense, and an error bit detected by the error bit detection / correction unit An error bit number storage section for storing the number, and changing the data channel currently used based on the error bit number stored in the error bit number storage section A transmitting / receiving device having a data channel change determining unit for determining whether or not is provided as a calling station and a called station, and in the called station, the data retransmission request determining unit detects the error bit detecting / correcting unit. When the number of error bits exceeds the number of correctable bits, the calling station is requested to retransmit the data, and the data channel change determination unit is currently used when the added value of the stored number of error bits exceeds a predetermined value. The present invention according to claim 3 is a radio equipment for data transmission adapted to change the data channel being operated to the calling station, and a receiving section for receiving a radio wave and demodulating it into a digital signal, Based on the output of the error bit detection / correction unit that detects and corrects the error bits of the demodulated digital signal to obtain control signals and data, and the error bit detection / correction unit Data retransmission request determination unit that determines whether or not to request data retransmission, a transmission signal generation unit that adds a control signal to transmitted data and converts it into a digital signal, and a digital signal converted by the transmission signal generation unit. A transmitter that modulates a signal into a radio wave and emits it, an empty data channel detector that detects an empty data channel by carrier sense, and a data resend request count storage that stores the number of times data resend is requested by the data resend request determination unit Unit, an error bit number storage unit that stores the number of error bits detected by the error bit detection / correction unit, based on the contents stored in the data retransmission request number storage unit and the error bit number storage number storage unit A transmitting / receiving device having a data channel change determining unit for determining whether to change the currently used data channel is provided as a calling station and a called station,
In the called station, the data retransmission request determination unit requests the calling station to retransmit data when the number of error bits detected by the error bit detection / correction unit exceeds the number of correctable bits, and the data channel The change determination unit is configured to change the currently used data channel to the calling station when the data retransmission request count and the addition value of the error bit count exceed respective predetermined values. The present invention according to claim 4 is a control signal for instructing a change of the data channel when the data channel change judging section of the called station judges to change the data channel currently used. Is generated by the transmission signal generation unit and transmitted to the calling station, and the calling station which has received the control signal detects a null data channel by the empty data channel detection unit and detects a new data channel. The wireless equipment for data transmission according to any one of claims 1 to 3, wherein a new data channel determined by the calling station is changed by determining the above. When the data channel change decision unit of the called station decides to change the data channel currently in use, the empty data channel detection unit detects an empty data channel, determines a new data channel, and The control signal for instructing a channel is generated by a transmission signal generation unit and transmitted to a calling station, thereby changing to a new data channel determined by the called station. The wireless equipment for data transmission described.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Error bit detection in the present invention
The correction unit, the data retransmission request determination unit, the transmission signal generation unit, the empty channel detection unit, the retransmission request number storage unit, the error bit number storage unit, and the data channel change determination unit perform digital signal processing and storage processing. Yes, they are collectively realized by the program operation of the microcomputer and the memory device. The processing of the error bit detection / correction unit, the empty channel detection unit, and the data retransmission request determination unit may be the same as the conventional means. Explaining an embodiment of the requirement that is a feature of the present invention, in the present invention according to claim 1, the retransmission request number storage unit stores the number of times the data retransmission request determination unit requests the calling station to perform retransmission, The number of consecutive retransmission requests may be stored, or the number of discontinuously occurring retransmission requests may be stored. The point is that the malfunction of the currently used data channel is requested. What is given as the history of. Further, the data channel change determination unit determines whether or not to change the data channel according to the content of the retransmission request number storage unit, and the data channel change may be determined based on the number of stored times. The determination can be made by comparison with a predetermined value. The retransmission request number storage unit is reset when the data channel change is completed. Further, in the present invention according to claim 2, the error bit number storage unit stores the data error bit number, and may be stored as a sequence of the error bit number for each data, or the cumulative value obtained by sequentially adding up It may be stored, or may be only the number of consecutive error bits or the number of discontinuously occurring error bits. The point is that the malfunction of the data channel currently in use is indicated by the number of error bits. What is given as the history of. The data channel change determination unit determines whether or not to change the data channel based on the content of the stored error bit number, and changes the data channel depending on the magnitude of the added value of the stored error bit numbers. Can be determined, and the determination can be made by comparison with a predetermined value. The error bit number storage unit is reset when the data channel change is completed, but it may be reset when no error bit is detected. Further, in the present invention according to claim 3, the data channel change judging section has the functions of the data channel change judging section in the above-mentioned claim 1 and claim 2. Also, in the present invention according to claim 4, when the data channel is changed, the transmission signal generator generates the control signal so that the calling station determines a new data channel. Further, in the present invention according to claim 5, when the data channel is changed, the transmission signal generating section generates a control signal for instructing the calling station of a new data channel determined by the called station.

The embodiments of the present invention will be described below.

[0013]

【Example】

(Embodiment 1) An embodiment of the wireless equipment for data transmission of the present invention according to claim 1 will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of this embodiment. It should be noted that the same components as those of the conventional example are given the same reference numerals and detailed description thereof will be omitted. The procedure for establishing the first line between the calling station 1 and the called station 2 is the same as in FIG.
The difference between this embodiment and the conventional example is that when the number of continuous retransmission requests at the called station exceeds a predetermined value during the period after the line is established and then the line is released, an instruction from the called station is issued. The reason is that the calling station is made to change the data channel. Therefore, the wireless transmission / reception devices that configure the calling station and the called station include a data retransmission request number storage unit that stores the number of times retransmission is requested, and data that determines whether to change the data channel according to the number of retransmission requests. And a channel change determination unit.

Further, in this embodiment, the calling station 1 is called by the called station 2.
It is assumed that there are two pieces of data to be transmitted to the data channel change determination unit 137 and the data retransmission request number storage unit 135.
Table 1 shows the operation standards.

[0015]

[Table 1]

That is, the condition for the data channel change determination unit 237 of the called station 2 to determine the data channel change request is when the retransmission request is made to the calling station 1 twice in a row. Further, the data resend request number storage unit stores only the number of consecutive resend requests twice, so when the data resend request is not issued (same as when a successful transmission is sent).
And reset the store count to 0 when the data channel is changed and an OK response is sent.

In the above configuration, the operation from the establishment of the line between the calling station 1 and the called station 2 to the transmission of the termination signal from the calling station 1 to the called station 2 will be described. FIG. 2 is a protocol diagram showing an operation example of this embodiment. Calling station 1
The transmission signal generation unit 133 converts the data 1 into a digital signal, and the transmission unit 12 modulates the digital signal into a radio wave and transmits the radio wave to the called station 2. The called station 2 demodulates the radio wave received by the receiving unit 21 into a digital signal, and the error bit detecting / correcting unit 231 detects whether or not the number of error bits exceeds the error correction capability. When the correction capability is exceeded, the data retransmission request determination unit 232 determines to request the calling station 1 to retransmit the data 1, and sets the stored value of the data retransmission request number storage unit 235 to 1. Further, the transmission signal generator 233 generates a control signal for instructing the data resend request to the calling station 1 by the output of the data resend request judgment unit 232, and the transmitter 22 modulates the control signal into an electric wave to make a call. Send to station 1. Since the data channel 1 currently used between the calling station 1 and the called station 2 has a large interference from other radio waves, the called station 2 makes a call by the data retransmission request determination unit 232. It is determined that the station 1 is requested to retransmit the data 1 again, and the value stored in the data retransmission request number storage unit 235 is set to 2. At this time, the data channel change determination unit 237 determines to change the currently used data channel 1 because the value of the request count becomes 2.

The transmission signal generator 233 outputs the data retransmission request determiner 232 and the data channel change determiner 2
Based on the output of 37, a control signal for instructing the calling station 1 to change the data channel and retransmit the data 1 is generated and transmitted to the calling station 1 via the transmitting unit 22. The calling station 1 determines the empty data channel detection unit 13 based on the received control signal.
In 4, a new empty data channel 2 is detected by carrier sense, a transmission signal generator 133 generates a control signal instructing the data channel 2, and the control signal is transmitted to the called station 2 via the transmitter 12. Based on the received control signal, the called station 2 transmits to the calling station 1 that the data channel 2 is used, and resets the value stored in the data retransmission request number storage unit 235 to zero. Calling station 1 uses data channel 2
To send data 1 using. This data channel 2
Since there is no interference from other radio waves, the called station 2 sends data 1
Is successfully received, and the fact that the transmission is successful is transmitted to the calling station 1. The calling station 1 receives the successful transmission, transmits the next data 2 to the called station 2, and receives the successful transmission from the called station 2, whereby the data transmission ends.

Since the data channel 1 having interference from other radio waves can be changed to the data channel 2 having no interference from other radio waves in this manner, the number of data retransmissions can be reduced.

In this embodiment, the number of continuous retransmission requests is set as the number of retransmission requests, but it may be a cumulative total number of discontinuous retransmission requests. Although the number of times exceeds the above number, it goes without saying that the number of times may exceed the number of times.

In this embodiment, the case where the calling station detects an empty data channel and determines a new data channel has been described. However, the called station detects an empty data channel and determines a new data channel. Alternatively, the data channel change and the new data channel may be instructed to the calling station.

(Embodiment 2) An embodiment of the present invention according to claim 2 will be described below with reference to the drawings. FIG. 3 is a block diagram showing the configuration of the present embodiment. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted. The present embodiment is different from the first embodiment in that the data channel is changed when the total number of error bits exceeds a predetermined value instead of the number of retransmission requests. Therefore, the transmitting / receiving devices of the calling station and the called station according to the present embodiment include the error bit number storage unit 136 that stores the total number of error bits, and the data channel change determination unit 137 determines the data channel by the total number. It is decided whether or not to change.

In this embodiment, it is assumed that the calling station 1 has five data to be transmitted to the called station 2 and the error bit correction capability is 1 bit. Table 2 shows the operation standards of the error bit number storage unit and the data channel determination unit.

[0024]

[Table 2]

That is, the data channel change judging section 13
7 determines to change the data channel when the total number of error bits becomes 3 or more. The error bit number storage unit 136 stores the total error bit number,
When data is received with 0 error bits, the stored value is 0
However, the frequency of frequent data channel changes is suppressed by resetting to the total when error bits are continuously detected, but the total number of error bits that do not continuously occur may be used.

In the above structure, the operation from the establishment of the line between the calling station 1 and the called station 2 to the transmission of the termination signal from the calling station 1 to the called station 2 will be described. FIG. 4 is a protocol diagram showing an operation example of this embodiment. Calling station 1
The transmission signal generation unit 133 converts the data 1 into a digital signal, and the transmission unit 12 modulates the digital signal into a radio wave and transmits it to the called station 2. In the called station 2, the receiving section 21 demodulates the radio wave into a digital signal, and the error bit detecting / correcting section 23
In step 1, it is detected that the number of error bits is 1, the bit is corrected, the value stored in the error bit number storage unit 236 is set to 1, and the transmission signal generation unit 233 indicates that the transmission is successful. A control signal for instructing is generated, the transmitting unit 22 modulates the control signal into a radio wave, and the radio wave is transmitted to the calling station 1. The calling station 1 transmits the data 2 to the called station 2 based on the control signal. Since the number of error bits in the received data 2 is 1, the called station 2 sets the value stored in the error bit number storage unit 236 to 2 and transmits to the calling station 1 that the transmission was successful.

Data 3 transmitted from the calling station 1 to the called station 2
Since the error bit number is 2, the data retransmission request determination unit 232 of the called station 2 determines the data retransmission request, and the error bit number storage unit 236 has a storage value of 4, so the data channel change determination unit At 237, the change of the data channel is determined, and the transmission signal generation unit 2 is determined based on the outputs of the data retransmission request determination unit 232 and the data channel change determination unit 237.
At 33, a control signal for instructing the calling station 1 to retransmit the data 3 and change the data channel is created and transmitted from the transmitting unit 22 to the calling station 1. Based on the received control signal, the calling station 1 detects a new empty data channel by carrier sense in the empty data channel detection section 134, and instructs the called station 2 to send the data channel 2 in the transmission signal generation section 133. A control signal is generated, and the transmitter 12 transmits a radio wave to the called station 2 using the control channel.

Based on the received control signal, the called station 2 sends a notification to the calling station 1 that the data channel 2 is to be used, and resets the error bit number storage section 236. The calling station 1 uses the data channel 2 to transmit data 3 to the called station 2. Since this data channel has a small bit error rate, the calling station 1 sends to the called station 2 data 3, data 4, which are data having an error bit number of 1 or less,
And the data 5 can be transmitted. In this way, it is possible to change from a data channel with a high bit error rate to a data channel with a low bit error rate, so that data transmission with a low bit error rate can be performed.

In this embodiment, the total number of error bits is set as the number of error bits, but it may be the total number of error bits at the time of consecutive retransmission requests, or the number of error bits may exceed the predetermined number, but may exceed the predetermined number. Good.

In this embodiment, the case where the calling station detects an empty data channel and determines a new data channel has been described. However, the called station detects an empty data channel and selects a new data channel. Alternatively, the data channel change and the new data channel may be instructed to the calling station.

(Embodiment 3) An embodiment of the present invention according to claim 3 will be described below. FIG. 5 is a block diagram showing the configuration of the present embodiment. The same components as those in the first and second embodiments are assigned the same reference numerals, and the detailed description is omitted. The present embodiment is different from the first and second embodiments in that the data channel is changed when either the number of retransmission requests or the number of error bits exceeds a predetermined value. Therefore, the transceiver of the present embodiment includes both a retransmission request number storage unit and an error bit number storage unit, and the data channel change determination unit determines that either the retransmission request number or the error bit number has a predetermined value. When it exceeds, it is determined to change the data channel.

With this configuration, when the number of error bits per data is large, the data channel change depending on the number of error bits works effectively, and when the number of error bits per data is small. Can enable the data channel to function effectively depending on the number of retransmission requests.

In this case, the number of retransmission requests may be the number of continuous retransmission requests or the total number of discontinuous retransmission requests. Further, although the number of times exceeds the above number, the number of times may be greater than or equal to the above number. The number of error bits may be the total number of error bits or the total number of error bits at the time of continuous retransmission requests.
Although the number exceeds the predetermined number, the number may be greater than the predetermined number. Even if the calling station detects an empty data channel and decides a new data channel, the called station detects an empty data channel and decides a new data channel. May be instructed to the calling station.

[0034]

According to the wireless equipment for data transmission of the present invention according to claim 1, a receiver for receiving radio waves and demodulating into a digital signal, and detecting and correcting an error bit of the demodulated digital signal, An error bit detection / correction unit that performs a process of obtaining a control signal and data, a data retransmission request determination unit that determines whether to request data retransmission based on the output of the error bit detection / correction unit, and data to be transmitted. A transmission signal generator that adds a control signal to the digital signal to convert it into a digital signal, a transmitter that modulates the digital signal converted by the transmission signal generator into a radio wave and emits the radio signal, and detects an empty data channel by carrier sensing. An empty data channel detection unit, a data retransmission request number storage unit that stores the number of times the data retransmission request determination unit requests data retransmission, and a data retransmission request number storage unit And a transmission / reception device having a data channel change determination unit that determines whether or not to change the currently used data channel is provided as a calling station and a called station, and the data retransmission request determination is made in the called station. The unit requests the calling station to retransmit data when the number of error bits detected by the error bit detection / correction unit exceeds the correctable number of bits, and the data channel change determination unit stores the stored number of retransmission requests. When the number exceeds the specified value, the data channel currently used is changed to the calling station, so that the data channel is changed by focusing on the number of data retransmission requests, and the bit error and the number of retransmission requests are changed. And data transmission with less transmission time loss can be realized. The data transmission wireless equipment of the present invention according to claim 2 further comprises a receiving unit for receiving radio waves and demodulating into a digital signal, a control signal for detecting and correcting an error bit of the demodulated digital signal, An error bit detection / correction unit that performs a process of obtaining data, a data retransmission request determination unit that determines whether to request data retransmission based on the output of the error bit detection / correction unit, and a control signal for the data to be transmitted. A transmission signal generator that adds a signal and converts it into a digital signal,
A transmission unit that modulates the digital signal converted by the transmission signal generation unit into an electric wave and emits it, an empty data channel detection unit that detects an empty data channel by carrier sense, and an error bit detection / correction unit. An error bit number storage unit that stores the number of error bits, and a data channel change determination unit that determines whether or not to change the currently used data channel based on the error bit number stored in the error bit number storage unit A transmitter / receiver including a transmitter and a receiver is provided as a calling station and a called station, and in the called station, the number of error bits detected by the error bit detection / correction unit of the data retransmission request determination unit exceeds the number of correctable bits. When requesting the call station to retransmit the data, the data channel change determination unit is currently used when the added value of the stored error bit number exceeds a predetermined value. By changing the existing data channel to the calling station, the data channel can be changed by paying attention to the number of error bits, and data transmission can be realized with a small number of bit errors and retransmission request times and a small transmission time loss. . According to a third aspect of the present invention, there is provided a radio equipment for data transmission according to the present invention, which comprises a receiving section for receiving a radio wave and demodulating into a digital signal, a control signal for detecting and correcting an error bit of the demodulated digital signal, An error bit detection / correction unit that performs a process of obtaining data, a data retransmission request determination unit that determines whether to request data retransmission based on the output of the error bit detection / correction unit, and a control signal for the data to be transmitted. And a transmission signal generating section for converting into a digital signal, a transmission section for modulating the digital signal converted by the transmission signal generating section into an electric wave and emitting the radio wave, and an empty data channel for detecting an empty data channel by carrier sense Detected by a detection unit, a data retransmission request number storage unit that stores the number of times data retransmission is requested by the data retransmission request determination unit, and an error bit detection / correction unit Error bit number storage unit that stores the number of error bits, whether to change the currently used data channel based on the contents stored in the data retransmission request number storage unit and the error bit number storage unit. A transmission / reception device having a data channel change determination unit for determination is provided as a calling station and a called station, and in the called station, the data retransmission request determination unit determines the number of error bits detected by the error bit detection / correction unit. When the number of correctable bits exceeds the correctable number of bits, the calling station is requested to retransmit the data, and the data channel change determination unit exceeds the predetermined value for each of the data retransmission request count and the error bit count addition value. At this time, by changing the data channel currently used by the calling station, the data channel is changed by paying attention to both the number of retransmission requests and the number of error bits. ,
It is possible to realize data transmission with few bit errors and a small number of retransmission requests, and little transmission time loss. Further, the data transmission radio equipment of the present invention according to claim 4 gives an instruction to change the data channel when the data channel change judging section of the called station judges to change the data channel currently used. By generating a control signal in the transmission signal generation unit and transmitting it to the calling station, the calling station receiving the control signal detects an empty data channel in the empty data channel detection unit and determines a new data channel, By changing to the new data channel decided by the calling station, data transmission with the new data channel decided by the calling station can be realized with less bit errors and fewer retransmission requests, and less transmission time loss. it can. In addition, claim 5
In the data transmission radio equipment of the present invention, when the data channel change determination unit of the called station determines to change the data channel currently used, the empty data channel detection unit detects the empty data channel. To determine a new data channel, generate a control signal instructing the data channel in the transmission signal generator and transmit the control signal to the calling station so that the called station can change to the new data channel. It is possible to realize data transmission with a small number of bit errors and a small number of retransmission requests, and a small transmission time loss by transmitting on a new data channel determined by the calling station.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a wireless equipment for data transmission of the present invention according to claim 1;

FIG. 2 is a protocol diagram showing an operation example of the same embodiment.

FIG. 3 is a block diagram showing the configuration of an embodiment of the wireless equipment for data transmission of the present invention according to claim 2;

FIG. 4 is a protocol diagram showing an operation example of the same embodiment.

FIG. 5 is a block diagram showing the configuration of an embodiment of the wireless equipment for data transmission of the present invention according to claim 3;

FIG. 6 is a block diagram showing a configuration of conventional data transmission wireless equipment.

FIG. 7 is a protocol diagram showing a line connection procedure in the conventional data transmission radio equipment.

FIG. 8 is a protocol diagram showing an operation example of a conventional radio equipment for data transmission.

[Explanation of symbols]

 1 Calling Station 2 Called Station 11, 21 Receiver 13, 23 Transmitter 131, 231, Error Bit Detection / Correction Unit 132, 232 Data Retransmission Request Judgment Unit 133, 233 Transmission Signal Generator 134, 234 Empty Data Channel Detector 135, 235 Data Retransmission Request Count Storage Unit 136, 236 Error Bit Count Storage Unit 137, 237 Data Channel Change Determination Unit

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[Procedure amendment]

[Submission date] December 27, 1995

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 3

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

In the above line connection procedure, the calling station 1
Converts the data transmitted by the transmission signal generation unit 133 into a digital signal, modulates the digital signal into a radio wave by the transmission unit 12 , and transmits the digital signal to the called station 2. The called station 2 demodulates the radio wave received by the receiving section 21 into a digital signal and detects an error bit.
The correction unit 231 detects the number of error bits of the digital signal, and when the number of error bits is within the error correction capability range,
While correcting the error bit, the transmission signal generation unit 233 generates a control signal for instructing the calling station 1 of successful transmission.
When the number of error bits exceeds the error correction capability, the data retransmission request determination unit 232 determines data retransmission, and the transmission signal generation unit 233 generates a control signal instructing the calling station 1 to retransmit the data. The transmission unit 22 modulates a control signal indicating either the successful transmission or the resend request into an electric wave and transmits the electric wave to the calling station 1.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

[0010]

According to a first aspect of the present invention, there is provided a receiving section for receiving a radio wave and demodulating it into a digital signal,
An error bit detection / correction unit that detects and corrects error bits of the demodulated digital signal to obtain a control signal and data, and requests data retransmission based on the output of the error bit detection / correction unit. A data retransmission request determination unit that determines whether or not a transmission signal generation unit that adds a control signal to the data to be transmitted and converts it into a digital signal, and modulates the digital signal converted by the transmission signal generation unit into radio waves. A transmitting section for emitting a data retransmission request, an empty data channel detecting section for detecting an empty data channel by carrier sense, a data retransmission request number storage section for storing the number of times the data retransmission request determining section requests data retransmission, and And a data channel change determination unit that determines whether to change the currently used data channel based on the number of requests. It is provided as a calling station and a called station, and in the called station, the data retransmission request determination unit sends data to the calling station when the number of error bits detected by the error bit detection / correction unit exceeds the number of correctable bits. Request to resend
Wherein the data channel change determination unit is a retransmission request number of said stored is the present data transmission radio equipment to which a data channel and so as to be changed to the calling station used when it exceeds a predetermined value, also, The present invention according to claim 2 includes a receiving unit that receives a radio wave and demodulates it into a digital signal,
An error bit detection / correction unit that detects and corrects error bits of the demodulated digital signal to obtain a control signal and data, and requests data retransmission based on the output of the error bit detection / correction unit. A data retransmission request determination unit that determines whether or not a transmission signal generation unit that adds a control signal to the data to be transmitted and converts it into a digital signal, and modulates the digital signal converted by the transmission signal generation unit into radio waves. And a transmission section that emits the data, an empty data channel detection section that detects an empty data channel by carrier sense, an error bit number storage section that stores the number of error bits detected by the error bit detection / correction section, and the error bit A data channel change determination unit that determines whether or not to change the currently used data channel based on the number of error bits stored in the number storage unit is provided. If the number of error bits detected by the error bit detection / correction unit exceeds the number of correctable bits, the data retransmission request determination unit is provided in the called station as a calling station and a called station. The data re-transmission request is issued to the calling station, and the data channel change determination unit causes the calling station to change the currently used data channel when the added value of the stored error bit number exceeds a predetermined value. According to another aspect of the present invention, there is provided a receiver for receiving radio waves and demodulating into a digital signal, and detecting and correcting an error bit of the demodulated digital signal. And an error bit detection / correction unit that performs processing for obtaining a control signal and data, and data retransmission that determines whether or not to request data retransmission based on the output of the error bit detection / correction unit. A determination unit, a transmission signal generation unit that adds a control signal to the data to be transmitted and converts it into a digital signal, a transmission unit that modulates the digital signal converted by the transmission signal generation unit into an electric wave and emits the electric wave, and a carrier. An empty data channel detection unit that detects an empty data channel by sensing, a data retransmission request number storage unit that stores the number of times data retransmission is requested by the data retransmission request determination unit, and an error detected by an error bit detection / correction unit It is determined whether or not to change the currently used data channel based on the contents stored in the error bit number storage unit that stores the bit number , the data retransmission request count storage unit, and the error bit number storage unit. A transmission / reception device having a data channel change determination unit for performing data transmission is provided as a calling station and a called station. When the number of error bits detected by the bit detection / correction unit exceeds the number of correctable bits, the calling station is requested to retransmit the data, and the data channel change determination unit determines whether the number of data retransmission requests and the number of error bits The present invention according to claim 4 is the radio equipment for data transmission, which allows the calling station to change the currently used data channel when the added value exceeds each predetermined value. When the data channel change decision unit of the called station decides to change the data channel currently in use, the control signal for changing the data channel is generated by the transmission signal generation unit and transmitted to the calling station. The calling station receiving the control signal detects the empty data channel by the empty data channel detection unit and determines a new data channel, and the new data channel determined by the calling station is detected. The data transmission radio equipment according to any one of claims 1 to 3, wherein the data channel change determination unit of the called station is presently used. When it is determined to change the current data channel, the empty data channel detection unit detects an empty data channel to determine a new data channel, and the transmission signal generation unit generates a control signal instructing the data channel. 4. The data transmission radio equipment according to claim 1, wherein a new data channel determined by the called station is changed by transmitting the data to the calling station.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Error bit detection in the present invention
The correction unit, the data retransmission request determination unit, the transmission signal generation unit, the empty channel detection unit, the data retransmission request number storage unit, the error bit number storage unit, and the data channel change determination unit perform digital signal processing and storage processing. These are collectively realized by the program operation of the microcomputer and the memory device. The error bit detection / correction unit,
The processing of the empty data channel detection unit and the data retransmission request determination unit may be the same as the conventional means. Explaining an embodiment of the requirement that is a feature of the present invention, in the present invention according to claim 1, the data retransmission request number storage unit stores the number of times the data retransmission request determination unit requests the calling station for retransmission. ,
You may store the number of consecutive retransmission requests,
In addition, the number of times of retransmission requests that have occurred discontinuously and discontinuously may be stored, and the point is that the malfunction of the currently used data channel may be given as a history of retransmission requests. The data channel change determination unit determines whether or not to change the data channel based on the content of the data retransmission request count storage unit, and the data channel change determination unit may determine the data channel change based on the number of stored times. , Can be determined by comparison with a predetermined value. The data resend request frequency storage unit is reset when the data channel change is completed. Further, in the present invention according to claim 2, the error bit number storage unit stores the data error bit number, and may be stored as a sequence of the error bit number for each data, or the cumulative value obtained by sequentially adding up It may be stored, or may be only the number of consecutive error bits or the number of discontinuously occurring error bits. The point is that the malfunction of the data channel currently in use is indicated by the number of error bits. What is given as the history of.
The data channel change determination unit determines whether or not to change the data channel based on the content of the stored error bit number, and changes the data channel depending on the magnitude of the added value of the stored error bit numbers. Can be determined, and the determination can be made by comparison with a predetermined value. The error bit number storage unit is reset when the data channel change is completed, but it may be reset when no error bit is detected. Further, in the present invention according to claim 3, the data channel change judging section has the functions of the data channel change judging section in the above-mentioned claim 1 and claim 2. Claim 4
In the present invention, when changing the data channel, the transmission signal generator generates a control signal so that the calling station determines a new data channel. Further, in the present invention according to claim 5, when the data channel is changed, the transmission signal generating section generates a control signal for instructing the calling station of a new data channel determined by the called station.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction contents]

(Embodiment 3) An embodiment of the present invention according to claim 3 will be described below. FIG. 5 is a block diagram showing the configuration of the present embodiment. The same components as those in the first and second embodiments are assigned the same reference numerals, and the detailed description is omitted. The present embodiment is different from the first and second embodiments in that the data channel is changed when either the number of retransmission requests or the number of error bits exceeds a predetermined value. Therefore, the transceiver of this embodiment includes both the data retransmission request count storage unit and the error bit count storage unit, and the data channel change determination unit determines whether the retransmission request count or the error bit count is a predetermined value. When it exceeds, it is determined to change the data channel.

Claims (5)

[Claims] 1. A receiver for receiving radio waves and demodulating into a digital signal, and an error bit detector / corrector for detecting and correcting error bits of the demodulated digital signal to obtain a control signal and data. And the error bit detection
A data retransmission request determination unit that determines whether to request data retransmission based on the output of the correction unit, a transmission signal generation unit that adds a control signal to the data to be transmitted and converts it into a digital signal, and the transmission signal generation Stores the number of times the data resend request determination unit requests data resending, the sending unit that modulates the digital signal converted by the unit into radio waves and emits the radio wave, the empty data channel detection unit that detects an empty data channel by carrier sense And a data channel change determination unit that determines whether or not to change the currently used data channel based on the stored request count. Provided as a called station, and in the called station, the data retransmission request determination unit is a bit number that can correct the error bit number detected by the error bit detection / correction unit. When the number of retransmission requests exceeds the predetermined number, the data channel change determination unit changes the currently used data channel to the calling station when the stored number of retransmission requests exceeds a predetermined value. Wireless equipment for data transmission. 2. A receiving unit for receiving radio waves and demodulating into a digital signal, and an error bit detecting / correcting unit for detecting and correcting error bits of the demodulated digital signal to obtain control signals and data. And the error bit detection
A data retransmission request determination unit that determines whether to request data retransmission based on the output of the correction unit, a transmission signal generation unit that adds a control signal to the data to be transmitted and converts it into a digital signal, and the transmission signal generation The transmission unit that modulates the digital signal converted by the unit to radio waves and emits it, the empty data channel detection unit that detects an empty data channel by carrier sensing, and the number of error bits detected by the error bit detection / correction unit. Transmission / reception including an error bit number storage unit to be stored and a data channel change determination unit that determines whether or not to change the currently used data channel based on the error bit number stored in the error bit number storage unit The apparatus is provided as a calling station and a called station, and in the called station, the data retransmission request determination unit detects the number of error bits detected by the error bit detection / correction unit. When the number of correctable bits is exceeded, the calling station is requested to retransmit the data, and the data channel change determination unit uses the data currently used when the added value of the stored error bit number exceeds a predetermined value. Radio equipment for data transmission adapted to change the channel to the calling station. 3. A receiver for receiving radio waves and demodulating into a digital signal, and an error bit detector / corrector for detecting and correcting error bits of the demodulated digital signal to obtain control signals and data. And the error bit detection
A data retransmission request determination unit that determines whether to request data retransmission based on the output of the correction unit, a transmission signal generation unit that adds a control signal to the data to be transmitted and converts it into a digital signal, and the transmission signal generation Stores the number of times data is requested to be retransmitted by the data retransmit request determination unit, a transmitter that modulates the digital signal converted by the unit and emits it into radio waves, a blank data channel detector that detects an empty data channel by carrier sensing A data retransmission request count storage unit, an error bit count storage unit that stores the error bit count detected by the error bit detection / correction unit, and a data retransmission request count storage unit and an error bit count storage count storage unit. A transmitting / receiving device equipped with a data channel change determination unit that determines whether or not to change the currently used data channel based on the contents And the called station, the data retransmission request determination unit in the called station retransmits data to the calling station when the number of error bits detected by the error bit detection / correction unit exceeds the correctable number of bits. And the data channel change determination unit changes the currently used data channel to the calling station when the data retransmission request count and the addition value of the error bit count exceed respective predetermined values. Wireless equipment for data transmission. 4. When the data channel change determination unit of the called station determines to change the data channel currently used, the transmission signal generation unit generates and issues a control signal for instructing the data channel change. The calling station which transmits to the calling station and receives the control signal detects the empty data channel by the empty data channel detection unit and determines a new data channel, thereby changing to the new data channel determined by the calling station. The radio equipment for data transmission according to any one of claims 1 to 3, which is configured as described above. 5. When the data channel change judging section of the called station judges to change the data channel currently used, the empty data channel detecting section detects an empty data channel and determines a new data channel. 3. The control signal for instructing the data channel is generated by the transmission signal generator and transmitted to the calling station, so that the called station changes to the new data channel. The radio equipment for data transmission according to any one of 1.