JP2003224548A - System and method for automatically setting number of waiting frames in automatic retransmission control protocol - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically set the optimum number (RTF value) of waiting frames without changing the format of an ARQ frame of an ARQ protocol. <P>SOLUTION: A control part has an ARQ protocol control part 111 for urging delay measurement when a call connection is made to the opposite party to start frame transmission and reception, a retransmission counter part 114 for counting the number of retransmitting times of a frame within a fixed time during transferring data of each call and urging delay measurement through the ARQ protocol control part 111 when the number of retransmitting times reaches a threshold, and a delay measuring part 115 for calculating an integer of an average value of the number of receiving times of a received ACK until receiving the same frame number as the frame number of a transmission frame of each call when the ARQ protocol control part 111 urges delay measurement, measures a value obtained by adding a predetermined adjustment value to the calculated average value and setting the measured value as the number of waiting frames. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to automatic retransmission control (A
The present invention relates to a method and a method for automatically setting the number of waiting frames (RTF) in an automatic retransmission control protocol in a communication system for transmitting and receiving by the RQ protocol.

[0002]

2. Description of the Related Art Conventionally, an automatic retransmission control protocol (hereinafter,
When transmitting and receiving data according to the ARQ protocol), the number of waiting frames (RTF) from the transmission of the frame to the retransmission is the maximum delay that occurs between arbitrary devices terminated by the ARQ protocol. The maximum value considering the time is fixedly set. Therefore, as a method for automatically setting a waiting frame in order to solve this, for example, it is disclosed in JP-A-9-191384. This Japanese Patent Laid-Open No. 9-191384 discloses ARQ.
In order to manage the order of frames on the transmitting side and the receiving side within a frame, count control information is provided in each field, and the number of waiting frames is set based on the count control information.

In view of the above problems, an object of the present invention is to make AR
It is to automatically set the optimum number of waiting frames (RTF value) without changing the format of the Q frame.

Another object of the present invention is to automatically set an optimum number of waiting frames between devices of different destinations under the environment corresponding to the connection with each device.

[0005]

However, according to the conventional automatic setting method, the number of waiting frames cannot be set unless the field of count control information is provided in the ARQ frame. Therefore, the format of the ARQ frame is changed. There is a problem that communication is not possible unless the other party is a device that does not support a specific ARQ frame, and a problem that a waiting frame cannot be automatically set.

[0006]

In order to achieve the above object, the automatic setting method of the number of waiting frames in the first automatic retransmission control protocol of the present invention is an apparatus for transmitting and receiving data by the automatic retransmission control protocol. This is an automatic setting method for the number of waiting frames in the automatic retransmission control protocol, and when receiving a ACK with the same frame number as the frame number of the transmission frame for each call when the call connection with the other party starts and the transmission and reception of the frame starts. Delay measurement means for calculating an integer of the average value of the number of received ACKs, measuring a value obtained by adding a predetermined adjustment value to the calculated average value, and setting the measured value as the number of waiting frames; Is characterized by having.

Further, the second automatic retransmission control protocol automatic setting method of the present invention is the automatic retransmission control protocol automatic setting method of the apparatus for transmitting and receiving data by the automatic retransmission control protocol. Therefore, when the number of times a frame is retransmitted within a certain period of time during the data transfer for each call is counted and a threshold value is reached, a re-transmission counter means for urging measurement of the delay, and when the measurement of the delay is urged, A value obtained by calculating an integer of the average value of the number of ACKs received until the ACK of the same frame number as the frame number of the transmission frame for each call is received, and adding the predetermined adjustment value to the calculated average value. And delay measurement means for setting the measured value as the number of waiting frames.

Further, the third automatic retransmission control protocol of the present invention is the automatic setting method of the number of waiting frames in the automatic retransmission control protocol of the device which transmits and receives data by the automatic retransmission control protocol. Therefore, when a frame is transmitted / received after the call connection is established with the other party, the measurement counting means for counting the number of times until the reception frame number having the same value as the transmission frame number of the frame to be continuously transmitted is received as one measurement count. Whenever the measurement counting means receives an ACK,
A frame number counting means for counting the number of K frames, and a setting for setting a waiting frame number based on the frame number counted for each measurement number when the measurement number by the measuring means reaches a predetermined number. And means.

Further, the automatic setting method of the number of waiting frames in the automatic retransmission control protocol of the fourth aspect of the present invention is the automatic setting method of the number of waiting frames in the automatic retransmission control protocol of a device which transmits and receives data by the automatic retransmission control protocol. Therefore, when a frame is retransmitted, a retransmission count means for counting the number of times of retransmission as one time, and a frame for continuously transmitting when the number of times of retransmission reaches a predetermined number of times within a predetermined time 1 until the reception frame number with the same value as the transmission frame number is received
Measurement counting means for counting as the number of times of measurement,
Based on the frame number counting means for counting the number of ACK frames each time the measurement counting means receives an ACK, and the number of frames counted for each measurement number when the measurement number reaches a predetermined number. And a setting means for setting the number of waiting frames.

Furthermore, in the automatic setting method of the number of waiting frames in the above-mentioned third or fourth automatic retransmission control protocol, the number of waiting frames is an adjustment number of a predetermined integer number of the average value of the number of frames. It is characterized by the addition of.

Further, in the automatic setting method of the number of waiting frames in the above third or fourth automatic retransmission control protocol, the number of waiting frames is set for each call.

A first method for automatically setting the number of waiting frames in the automatic retransmission control protocol of the present invention is a method for automatically setting the number of waiting frames in the automatic retransmission control protocol of a device that transmits and receives data by the automatic retransmission control protocol. Therefore, when the call connection with the other party starts and the transmission and reception of the frame starts, the integer of the average value of the number of received ACKs until the ACK of the same frame number as the frame number of the transmission frame for each call is received is calculated. Then, a value obtained by adding a predetermined adjustment value to the calculated average value is measured, and the measured value is set as the number of waiting frames.

A second method of automatically setting the number of waiting frames in the automatic retransmission control protocol of the present invention is the method of automatically setting the number of waiting frames in the automatic retransmission control protocol of a device that transmits and receives data by the automatic retransmission control protocol. Therefore, it is determined whether or not a threshold value is reached by counting the number of frame retransmissions within a fixed time during data transfer for each call, and when the threshold value is reached, the frame of the transmission frame for each call A with the same frame number as the number
Calculate the integer of the average value of the number of ACK received until receiving CK, measure the value obtained by adding a predetermined adjustment value to the calculated average value, and use the measured value as the number of waiting frames It is characterized by setting.

The third method of automatically setting the number of waiting frames in the automatic retransmission control protocol of the present invention is the method of automatically setting the number of waiting frames in the automatic retransmission control protocol of a device that transmits and receives data by the automatic retransmission control protocol. Therefore, when the call connection with the other party starts and the transmission / reception of the frame starts, the time until the reception frame number of the same value as the transmission frame number of the frame that continues to be transmitted is counted as one measurement and ACK is received during that time.
The number of ACK frames is counted each time a message is received, and when the number of measurements reaches a predetermined number, the number of waiting frames is set based on the number of frames counted for each number of measurements. .

A fourth method of automatically setting the number of waiting frames in the automatic retransmission control protocol of the present invention is the method of automatically setting the number of waiting frames in the automatic retransmission control protocol of a device that transmits and receives data by the automatic retransmission control protocol. Therefore, when a frame is retransmitted, it is counted as one retransmission, and when the number of retransmissions reaches a predetermined number within a predetermined time, it is the same as the transmission frame number of the frame that continues to be transmitted. The number of times of measurement until the reception frame number of the value is received is counted as one time, and the number of frames of ACK is counted every time ACK is received during that time, and when the number of times of measurement reaches a predetermined number, the number of times of measurement is counted. The number of waiting frames is set based on the number of frames counted for each.

Further, in the above-described method for automatically setting the number of waiting frames in the third or fourth automatic retransmission control protocol, the number of waiting frames is an adjustment number of a predetermined integer number which is an integer of the average value of the number of frames. It is characterized by the addition.

Furthermore, in the automatic setting method of the number of waiting frames in the above third or fourth automatic retransmission control protocol, the number of waiting frames is set for each call.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 1, there is shown a system configuration showing an example of the present embodiment, which is a network 900.
And a device 1 connected to the network 900 and a device 2 connected to the network 900.

The apparatus 1 and apparatus 2 of FIG. 1 measure a time by a control section 11 operated by program control by a processor (CPU) (not shown), an interface section 14 for exchanging data with another apparatus, and a time. The timer 13 for interrupting the control unit 11, a preset retransmission threshold 141, a preset measurement count threshold 142, and an ARQ table 15 are included.

The retransmission threshold value 141 and the measurement frequency threshold value 142 of FIG. 1 are respectively allocated in a readable / writable storage unit (eg, flash memory),
It is set in advance, the retransmission threshold 141 indicates the maximum number of times of retransmission, and the measurement number threshold 142 indicates the number of times of measuring the delay frame number.

The ARQ table 15 is allocated in a readable / writable storage unit (eg, RAM), and is managed by being registered in the ARQ table 15 when a transmission source and a transmission destination are connected by call. Call release (disconnection)
Then, the ARQ table 15 is deleted. As shown in FIG. 3, the ARQ table 15 includes, for each call, an identification number of a transmission source indicating a connection source (for example, a telephone number of the transmission source),
The identification number of the transmission destination indicating the connection destination (for example, the telephone number of the transmission destination), the RTF value indicating the number of waiting frames, the number of retransmissions indicating the number of retransmissions, and the frame number of the transmitted frame (also called a sequence number) And the A transmitted to check the frame number of the ACK.
A waiting frame number indicating the frame number of an ACK waiting for a response to the RQ frame, a frame number indicating the number of ACKs received to calculate the delay of the ARQ frame, and a measurement indicating the frame number of the measurement start of the delay frame number. It consists of a start frame number and the number of times of measurement indicating the number of measured delayed frames.

Referring to FIG. 2, there is shown a functional block diagram showing in block form the functions of the control unit 11 of FIG. 1 which operates under program control according to the present embodiment.
The ARQ protocol control unit 111 that mainly terminates the ARQ protocol, the transmission frame control unit 112 that controls the transmission of the ARQ frame, the reception frame control unit 113 that controls the reception of the ARQ frame, and the delay in the ARQ protocol section are measured. It has a delay measuring unit 115 and a retransmission counter unit 114 that counts the number of times of retransmission of an ARQ frame within a fixed time.

The devices 1 and 2 of FIG. 2 set the RTF value during the negotiation performed when the call is connected, and
There are cases where the RTF value is set during normal data transmission. In other words, the ARQ protocol control unit 111 measures the delay with respect to the delay measuring unit 115 when the call connection with the other party starts and the transmission and reception of the negotiation frame starts, or when the retransmission counter unit 114 requests the delay measurement. To set the RTF value. Regarding the method of assigning the frame number of the ARQ frame during the negotiation between the device 1 and the device 2, the ARQ protocol control unit 111 uses the same frame until the ACK with the same frame number as the ARQ frame transmitted from the other party comes back. The frame number is continued to be transmitted, and when an ACK with the same frame number as the transmitted ARQ frame comes back, the frame number is incremented by 1 and transmitted. Also, regarding the method of assigning the frame number of the ARQ frame during the normal data transfer between the device 1 and the device 2, the ARQ protocol control unit 111
Increases the frame number each time an ARQ frame is transmitted. The retransmission counter unit 114 of FIG. 2 counts the number of frame retransmissions within a certain time during data transfer for each call, and when the number exceeds the threshold value, the ARQ protocol control unit 11
The delay measuring unit 115 is prompted to measure the delay via 1. Figure 2
Delay measuring section 115 of ARQ protocol control section 111
When calculating the delay of each call from, calculate the integer of the average value of the number of ACKs received until the ACK of the same frame number as the frame number of the transmission frame is received,
A value obtained by adding a predetermined adjustment value to the calculated average value is measured, and the measured value is set as the number of waiting frames in the RTF value of the ARQ table 15.

The transmission frame control unit 112 of FIG.
A transmission frame is created under the control of the Q protocol control unit 111, and the network 9 is transmitted via the interface unit 12.
To 00.

The reception frame control unit 113 in FIG. 2 analyzes the control information of the ARQ frame from the reception frame received from the interface 900 via the interface unit 12, and passes the control to the ARQ protocol control unit 111.

Referring to FIG. 4, there is shown a format diagram illustrating an outline of an ARQ frame used in the ARQ protocol. That is, the ARQ frame includes reception confirmation information (for example, A
CK, NAK) and other control information fields, the received frame number field when the frame number received on the receiving side is returned as a response, and the control information to be transmitted. Field of the transmission control information that indicates the number of the frame to be transmitted, the field of the transmission frame number that sets the transmission frame number that the transmission side gives to the frame to notify the reception side of the number of the frame, and the control information of the higher protocol level It includes a field of transmission information for setting data and a field of CRC information which is information for CRC check.

Next, the operation of the embodiment of the present invention will be described with reference to FIGS.

Now, in FIG. 1, a case where the device 1 is a mobile phone, the device 2 is a base station, and the network 900 is a radio will be described as an example. It should be noted that, on the device 2 side, blocks irrelevant to the present invention, such as a block diagram used between the base station and the exchange, are omitted. The interface unit 12 also includes an antenna. When transmitting, the electric signal is replaced with an electric wave for transmission, and when receiving, the electric wave is replaced with an electric signal for reception.

First, when the call is connected to the destination by the call setting from the device 1 to the device 2, the ARQ of the control unit 11 of the device 1
The protocol control unit 111 sets the areas of the identification number of the transmission source (apparatus 1) and the transmission destination (apparatus 2) of the call connection in the ARQ table 15. Similarly, on the device 2 side, the ARQ table 15 of the device 2 is set in each area of the identification number of the transmission source (device 2) and the transmission destination (device 1) connected to the call. In this way, every time a plurality of calls are connected due to call setup, ARQ is performed.
It is set in each area of the identification number of the transmission source and the identification number of the transmission destination connected in the call in the table 15. In the following inventions, it is possible to manage each of a plurality of calls,
For convenience of explanation, the description will focus on the device 1 focusing on only one call.

Further, the ARQ protocol control section 111 of the control section 11 sets A in order to set ARQ parameters.
RQ synchronization establishment (starting negotiation when ACK of the transmitted frame is received) and negotiation (setting of ARQ parameter for destination) are performed.

First, the ARQ protocol control unit 111
Transmission is started from the transmission frame number "0" via the transmission frame control unit 112, but until the ACK of the transmission frame number "0" comes back and synchronization is established, the same transmission frame number "0" is kept. ARQ frames are continuously transmitted via the transmission frame control unit 112 at regular intervals (20 ms).

When the device 2 receives via the reception frame 113, it analyzes the frame and sets the reception frame number in the ARQ frame and the transmission frame number as the transmission side in the frame and transmits the frame.

When the ARQ protocol control section 111 of the device 1 starts to synchronize, the delay measurement section 115 is instructed to start delay measurement. Further, the ARQ protocol control unit 111 starts the negotiation process and sets the transmission frame number of the ARQ table 15 to “1”.
In addition, the waiting frame number is set to "1", and the ACK of the receiving frame number having the same value as the waiting frame number of the ARQ table 15 is received.
A of the transmission frame number "1" until it returns via 3
RQ frames are continuously transmitted via the transmission frame control unit 112 at regular intervals (for example, 20 ms). Note that the ARQ protocol control unit 111 of the device 1 has the same value as the received transmission frame number in the reception control area of the frame to be returned as ACK when a response to the device 2 is required in the case of continuing the transmission. It is transmitted as the received frame number.

During this period, the ARQ protocol control unit 111 of the device 1 receives the ACK received frame number every time an ACK is received via the received frame control unit 113 and the AR.
The waiting frame number of the Q table 15 is compared, and if they match, the transmission frame number and the waiting frame number of the ARQ table 15 are each incremented by +1 and the reception frame number of the received ACK is notified to the delay measuring unit 115. By doing so, the number of frames in the ARQ table 15 is incremented by +1. If they do not match, AR
The Q protocol control unit 111 increments the number of frames in the ARQ table 15 by +1 by notifying the delay measurement unit 115 of the received frame number of the received ACK. In this way, the ARQ protocol control unit 111 receives the ACK of the same frame number and receives the AR.
The transmission frame number and the waiting frame number of the Q table 115 are each incremented by +1 and the ARQ frame to be transmitted next is added with the counted transmission frame number and transmitted.

On the other hand, the delay measuring unit 115 which receives the notification of the delay measurement from the ARQ protocol control unit 111 sets the transmission frame number of the ARQ frame table 15 to the measurement start frame number of the ARQ table 15,
Start measuring delay. AC after receiving the delay measurement notification
Each time the notification of the K received frame number is received from the ARQ protocol control unit 111, the delay measurement unit 115 increments the number of frames in the ARQ table 15 by +1 and the response frame number of the ACK and the measurement start frame number become one. Check whether you are doing. When they match, the delay measuring unit 115 sets the transmission frame number of the ARQ table 15 in which the frame number of the next transmission is set to A.
Set the measurement start frame number in the RQ table 15 to A
The number of times of measurement of the RQ table 15 is incremented by +1. When the number of times of measurement is counted up, the delay measuring unit 115 checks whether or not the number of times of measurement reaches the number-of-measurements threshold value 142.
Wait for notification of the next ACK received frame number. Even if the delay measuring unit 115 does not match the ACK received frame number and the measurement start frame number, the delay measuring unit 115 waits for notification of the next ACK received frame number.

FIG. 5 is a sequence diagram briefly showing the operation of measuring the delay according to the exchange of data during the negotiation between the device 1 and the device 2. However,
The device 1 side is shown as a transmitting side and the device 2 side is shown as a receiving side.

When the number of measurement times and the number of measurement times threshold 142 of the ARQ table 15 are reached, the delay measuring section 11
In order to output the RTF value, 5 calculates <round up of frame number / n + α>, sets it to the RTF value of ARQ table 15, and clears each area of frame number, measurement start frame number, and measurement count. And RTF
The ARQ protocol control unit 111 is notified that the value has been set. Then, the ARQ protocol control unit 111 causes A
Retransmission counter of RQ table 15, transmission frame number,
And each area of the waiting frame number are cleared (all “0”). In this case, the “frame number” used in the equation indicates the frame number of the ARQ table 15, and “n” indicates the number of times of measurement of the ARQ table 15. Further, α represents an adjustment value of the RTF value, and is preferably a small positive integer (eg 1, 2, etc.). That is, the number of frames / n indicates the average of the number of delayed frames, and a value obtained by adding + α (for example, +1) to the value of the number of frames / n rounded up to an integer is the RTF value. For example, the RTF value in the case of FIG. 5 is 5 when alpha is 1.

Therefore, the ARQ protocol control unit 11
1 is the RTF of the automatically set ARQ table 15
Retransmission control will be performed using the value.

When performing normal (user-to-user) data transfer between devices after call setup, the ARQ protocol control unit 111 of the control unit 11 normally sends the transmission frame control unit 112.
The transmission of the ARQ frame is started from the transmission frame number “0” via the transmission frame number, and the transmission frame number of the ARQ table 15 is sequentially incremented by 1 until the transmission is completed, and the frame number of the ARQ frame is set to 20 ms via the transmission frame control unit 112. Keep sending at intervals. When starting the transmission of the ARQ frame from the frame number "0",
The ARQ protocol control unit 111 activates the timer 13.

Each time the ARQ protocol control section 111 receives an ACK via the reception frame control section 113, it compares the received frame number of the ACK received with the waiting frame number of the ARQ table 15. If they match, it is normal. Further, the ARQ protocol control unit 111 receives an ARQ each time it receives an ACK via the reception frame control unit 113.
The number of delayed frames, which is a value obtained by subtracting the reception frame number of ACK from the transmission frame number of table 15, is compared with the RTF value of ARQ table 15. The number of delayed frames is R
If it is less than the TF value, it is normal. If both are normal, the ARQ protocol control unit 111 continues transmission in sequence through the transmission frame control unit 112 as it is, but compares the received frame number of the received ACK with the waiting frame number of the ARQ table 15. If they do not match, or if the number of delayed frames has reached the RTF value of the ARQ table 15, the ARQ protocol control section 111 judges that there is an error and transmits the received frame number having the same value as the waiting frame number. The frame number is set, the transmission frame control unit 112 is made to perform retransmission from the set frame number, and the retransmission counter unit 114 is requested to check the number of retransmissions.

When a NAK indicating a CRC error, data loss, etc. is received via the reception frame control unit 113, the ARQ protocol control unit 111 judges that it is an error and the reception frame having the same value as the waiting frame number is received. The number is set to the transmission frame number, the transmission frame control unit 112 is caused to perform retransmission from the set transmission frame number, and the retransmission counter unit 114 is requested to check the number of retransmissions.

Further, the ARQ protocol control section 111 is
If an ACK having the same frame number as the transmission frame number in the ARQ table 15 is not received even after the RTF value has elapsed, it is determined that an error has occurred and the reception frame number having the same value as the waiting frame number is set as the transmission frame number. Retransmit from the set frame number Transmission frame control unit 1
12 and request the retransmission counter unit 114 to check the number of retransmissions.

On the other hand, the retransmission counter unit 114, which has received the request for checking the number of retransmissions, increments the number of retransmissions in the ARQ table 15 by +1 and determines whether the number of retransmissions has reached the retransmission threshold 141. This is performed by comparing the number of retransmissions and the retransmission threshold 141. When the number of retransmissions has reached, the retransmission counter unit 114
The ARQ protocol control unit 111 is notified that the number of retransmissions has reached. When the number of retransmissions has not reached, the retransmission counter unit 114 does nothing and ends the process as it is.

On the other hand, the timer 13 activated by the ARQ protocol control unit 111 interrupts at regular intervals during data communication.
Retransmission counting unit 11 activated by interrupt from 3
4 resets the number of retransmissions in the ARQ table 15.
Therefore, the retransmission counter unit 114 checks whether the number of retransmissions exceeds the retransmission threshold 141 within a fixed time.

On the other hand, when the number of times of retransmission is reached, the retransmission counter unit 1
The ARQ protocol control unit 111, which receives the delay measurement unit 14 from the controller 14, issues a delay measurement start instruction to the delay measurement unit 115, and performs a delay measurement unit other than a normal operation each time an ACK is received via the reception frame control unit 113. The reception frame number of the received ACK is notified to 115.

On the other hand, the delay measuring unit 115, which has received the notification of the delay measurement from the ARQ protocol control unit 111, starts the delay measurement by setting the transmission frame number in the measurement start frame number of the ARQ table 15. Every time the ARQ protocol control unit 111 receives a notification of the ACK reception frame number after receiving the delay measurement notification, the delay measurement unit 115 increments the number of frames in the ARQ table 15 by +1.
While counting up, the reception frame number of ACK and the measurement start frame number are checked. When they match, the delay measuring unit 115 sets the transmission frame number of the ARQ table 15 in which the frame number of the next transmission is set to A.
The measurement start frame number of the RQ table 15 is set, and the number of measurements is incremented by +1. When the number of times of measurement is counted up, the delay measuring unit 115 checks whether or not the number of times of measurement and the number of times of measurement threshold value 142 have been reached, and if not, notifies the reception frame number of the next ACK. Wait for Even if the delay measuring unit 115 does not match the ACK received frame number and the measurement start frame number, the delay measuring unit 115 waits for notification of the next ACK received frame number.

FIG. 6 is a sequence diagram briefly showing the operation of measuring the delay according to the exchange of data between the users between the device 1 and the device 2 as described above. In this case, the RTF value initially set is 5 (setting according to FIG. 5),
Since the number of delayed frames has reached 5, retransmission is performed and the delay is measured in parallel with the retransmission. However, the device 1 side is shown as a transmitting side and the device 2 side is shown as a receiving side.

When the number of measurement times and the number of measurement times threshold 142 of the ARQ table 15 are reached, the delay measuring section 11
In order to output the RTF value, 5 calculates <round up of frame number / n + α> and sets it to the RTF value of the ARQ table 15, and at the same time, sets the frame number of the ARQ table 15, the measurement start frame number, and the number of measurements. Clear each area (all "0"). The “frame number” in this case indicates the frame number of the ARQ table 15,
“N” indicates the number of measurements of the ARQ table 15. Further, α represents an adjustment value of the RTF value, and is preferably a small positive integer (eg 1, 2, etc.). That is, the number of frames / n represents the average of the number of delayed frames, and the value of the number of frames / n rounded up to an integer is + α.
The value obtained by adding (for example, +1) becomes the RTF value.

Further, the delay measuring section 115 notifies the ARQ protocol control section 111 that the RTF value has been set. Upon receiving the notification of the RTF value setting, the ARQ protocol control unit 111 automatically resets the ARQ table 15
Retransmission control will be performed using the RTF value of. Thus, during the data communication, the retransmission counting unit 114 always
By monitoring the number of retransmissions, it becomes possible to automatically set the optimum RTF value.

In the above description, only one call connection is described, but since the ARQ table 15 can be managed independently for each call, only the control becomes parallel and the above-mentioned control is performed. Since the operations are independent as described above, it is clear that the operation is the same as one call connection. In this case, each ARQ protocol control unit 111, the retransmission counter unit 114, and the delay measurement unit 115 that access the ARQ table 15 identify the call by searching the identification numbers of the transmission source and the transmission destination.

Further, in the above description, the identification number of the transmission source and the identification number of the transmission destination of the ARQ table 15 are used for discrimination for each call, but an identification number capable of identifying the call may be provided in the ARQ table 15. .

[0053]

As described above, according to the present invention, R is based on the frame number used in the ARQ protocol at the time of call connection.
Since the TF value is flexibly and automatically set, there is an effect that it is possible to easily cope with a difference in transmission path and a difference in transmission delay caused by roaming, etc., and to realize efficient data communication. Further, since the RTF is set for each call, there is an effect that the RTF value suitable for the environment can be used for the exchange between a plurality of devices having different environment conditions.

Further, according to the present invention, when the number of times of retransmitting a frame within a fixed time reaches a prescribed number during data transfer for each call, R is based on the frame number used in the ARQ protocol.
Since the TF value is flexibly and automatically set, there is an effect that it is possible to easily cope with a difference in transmission path and a difference in transmission delay caused by roaming, etc., and to realize efficient data communication.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a system according to an embodiment of the present invention.

FIG. 2 is a functional block diagram showing a functional configuration when the control unit of FIG. 1 operates under program control according to the ARQ protocol.

3 is a configuration diagram showing a configuration in an ARQ table 15 of FIG.

4 is a schematic configuration diagram showing an outline of a configuration of a format in an ARQ frame exchanged between the devices of FIG. 1 based on an ARQ protocol.

5 is a sequence diagram showing an example in which delay measurement is performed during negotiation between the devices in FIG. 1. FIG.

FIG. 6 is a sequence diagram showing an example in which delay measurement is performed during data transfer between users between the devices in FIG.

[Explanation of symbols]

1, 2 device 11 Control unit 12 Interface part 13 timer 15 ARQ table 111 ARQ protocol control unit 112 Transmission frame control unit 113 Received frame control unit 114 Retransmission counter section 115 Delay measurement unit 141 Retransmission threshold 142 Measurement count threshold

Claims (12)

[Claims] 1. A method of automatically setting the number of waiting frames in an automatic retransmission control protocol of a device that transmits and receives data by the automatic retransmission control protocol, and when each frame is transmitted and received when a call connection is established with a partner. The average value of the number of ACKs received until the ACK with the same frame number as the frame number of the transmission frame is calculated, and the value obtained by adding a predetermined adjustment value to the calculated average value is measured. And a delay measuring unit that sets the measured value as the number of waiting frames, the automatic setting method of the number of waiting frames in the automatic retransmission control protocol. 2. A method of automatically setting the number of waiting frames in an automatic retransmission control protocol of a device that transmits and receives data by the automatic retransmission control protocol, and counts the number of frame retransmissions within a fixed time during data transfer for each call. Retransmission counter means for promoting the measurement of the delay when the threshold is reached, and ACK of the same frame number as the frame number of the transmission frame for each call when the measurement of the delay is prompted.
Calculate the integer of the average value of the number of ACKs received before receiving, and measure the value obtained by adding a predetermined adjustment value to the calculated average value, and set the measured value as the number of waiting frames An automatic setting method of the number of waiting frames in the automatic retransmission control protocol, which comprises: 3. A method of automatically setting the number of waiting frames in an automatic retransmission control protocol of an apparatus that transmits and receives data by an automatic retransmission control protocol, and transmits when a frame is transmitted and received by connecting with a destination. Measurement count means for counting the number of times until the reception frame number having the same value as the transmission frame number of the frame to be continued is received as one measurement, and the measurement counting means ACKs
Frame number counting means for counting the number of ACK frames each time it receives, and when the number of times of measurement by the measuring means reaches a predetermined number, a waiting frame based on the number of frames counted for each number of times of measurement. An automatic setting method for the number of waiting frames in an automatic retransmission control protocol, characterized in that it has a setting means for setting the number. 4. A method of automatically setting the number of waiting frames in an automatic retransmission control protocol of a device that transmits and receives data by an automatic retransmission control protocol, wherein when the frame is retransmitted, the retransmission is counted as one retransmission Counting means and one measurement number of times until the reception frame number having the same value as the transmission frame number of the frame that continues to be transmitted when the number of retransmissions reaches a predetermined number within a predetermined time A measurement count means for counting as, a frame number count means for counting the number of ACK frames each time an ACK is received by the measurement count means, and a number of measurement times when the number of measurements reaches a predetermined number. Setting means for setting the number of waiting frames based on the counted number of frames, A method for automatically setting the number of waiting frames in the automatic retransmission control protocol. 5. The waiting frame in the automatic retransmission control protocol according to claim 3, wherein the number of waiting frames is obtained by adding an adjustment number of a predetermined integer to an integer of the average value of the number of frames. Automatic number setting method. 6. The automatic setting method for the number of waiting frames in the automatic retransmission control protocol according to claim 3, 4, or 5, wherein the number of waiting frames is set for each call. 7. A method for automatically setting the number of waiting frames in an automatic retransmission control protocol of a device that transmits and receives data by the automatic retransmission control protocol, and when each frame is transmitted and received when a call connection is established with a partner. The average value of the number of ACKs received until the ACK with the same frame number as the frame number of the transmission frame is calculated, and the value obtained by adding a predetermined adjustment value to the calculated average value is measured. Then, the measured value is set as the number of waiting frames, and the method of automatically setting the number of waiting frames in the automatic retransmission control protocol. 8. A method of automatically setting the number of waiting frames in an automatic retransmission control protocol of a device that transmits and receives data by the automatic retransmission control protocol, and counts the number of frame retransmissions within a fixed time during data transfer for each call. Then, it is determined whether or not the threshold value is reached, and when the threshold value is reached, the A received until the ACK having the same frame number as the frame number of the transmission frame for each call is received.
Automatically characterized by calculating an integer of the average value of the number of CK receptions, measuring a value obtained by adding a predetermined adjustment value to the calculated average value, and setting the measured value as the number of waiting frames A method for automatically setting the number of waiting frames in the retransmission control protocol. 9. A method for automatically setting the number of waiting frames in the automatic retransmission control protocol of a device that transmits and receives data by the automatic retransmission control protocol, which is transmitted when a frame is transmitted and received by connecting with a destination. The number of ACK frames is counted every time an ACK is received, and the number of ACK frames is counted every time an ACK is received. A method for automatically setting the number of waiting frames in the automatic retransmission control protocol, wherein the number of waiting frames is set on the basis of the number of frames counted for each of the measurement times. 10. A method for automatically setting the number of waiting frames in an automatic retransmission control protocol of a device that transmits and receives data according to an automatic retransmission control protocol, wherein when a frame is retransmitted, it is counted as one retransmission count,
When the number of times of retransmission reaches a predetermined number of times within a predetermined time, 1 is set until the reception frame number having the same value as the transmission frame number of the frame to be continuously transmitted is received.
The number of times of measurement is counted and the number of ACK frames is counted each time an ACK is received, and when the number of times of measurement reaches a predetermined number of times, it waits based on the number of frames counted for each number of times of measurement. A method for automatically setting the number of waiting frames in an automatic retransmission control protocol, characterized by setting the number of frames. 11. The number of waiting frames in the automatic retransmission control protocol according to claim 9, wherein the number of waiting frames is obtained by adding an adjustment number of a predetermined integer to an integer of the average value of the number of frames. Automatic setting method. 12. The method for automatically setting the number of waiting frames in the automatic retransmission control protocol according to claim 9, 10, or 11, wherein the number of waiting frames is set for each call.