JP2001057583A - Data transfer control method and data transfer controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a data transmission control method that can enhance a data transfer efficiency and provide optimum flow control to data transfer by a host layer. SOLUTION: In the data transfer where transmission reception of a message of a layer 3 conducted on a logic link of a layer 2 (LAPDM) is conducted in the unit of flow control, an information frame including identification information to identify flow control in the unit of logical channels of the host layer is generated and the host layer informs an opposite station of a message in the information frame so as to divide the flow control in one logical link in the unit of logical channels of the host layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transfer control method for performing data communication,
A protocol having a C (High-level Data Link Control) procedure, for example, a LAPDM (Link Access Procedure for LAPDM) described in “Digital Automobile Telephone System Standard” issued by ARIB, Inc.
Digital Mobile channel: relates to a data transfer control method defined in layer 2).

[0002]

2. Description of the Related Art A conventional data transfer control method will be described below. For example, in LAPDM (Layer 2)
In order to facilitate processing by a computer, data is transmitted in a unit of a frame divided into a predetermined length or less. At this time, the frames are numbered and managed to guarantee the order. With this, it notifies the delivery confirmation of whether or not the transmitted frame has arrived reliably, and if the receiving process on the receiving side is not in time, notifies the transmitting side to that effect and notifies the transmitting side to refrain from transmitting the frame, Flow control (layer 3 performed between mobile station and network)
Message transmission / reception).

FIG. 7 shows, for example, the radio wave industry (A)
RIB) published in "Digital Car Phone System Standard (RCR STD-27G)"
This is a data transfer control method defined by APDM.

Hereinafter, a conventional data transfer control method will be described with reference to FIG. For example, a layer 3 message transmitted / received between the mobile station and the network, that is, a message 50 of the mobility management unit: MM and a message 51 of the radio management unit: RT are each a layer 2 (LAPDM).
(Unnumbered information) frames 50a and 51a
Is transferred by Similarly, in order to set up a logical link, a DL (communication between layer 3 and data link layer) setting request 52 from layer 3 is sent to SABME frame 52a.
, And receives the response as the DL setting confirmation 53 by receiving the UA (unnumbered confirmation) frame 53a. Furthermore, CC messages 54 and 5 transmitted and received between the mobile station and the network from layer 3 (control unit: CC)
5 are layer 2 I (information) frames 54a, respectively.
And 55a.

[0005] In layer 3 (CC), a plurality of services can be provided by setting a plurality of independent virtual circuits (SVC). Therefore, as shown in FIG. 8, for example, all messages 60 and 61 related to the plurality of virtual circuits are transferred at Layer 2 as I frames 60a and 61a on one logical link. Become. However, FIG. 8 is a diagram showing transmission and reception of layer 3 messages, that is, flow control, performed between the mobile device and the network.

Here, for example, if the I frame 60a carrying the message 60 of the virtual line A disappears on the wireless line, the receiving side will receive only the I frame 61a. At this time, the receiving side transmits an SREJ frame (selective reject) for requesting retransmission of the I frame indicated by the reception sequence number N (R),
The transmitting side receiving the SREJ frame again transmits the lost message 60 of the virtual circuit A to the I frame 60.
b. That is, unless the message 60 can be recovered by retransmission,
Since the delivery of message 61 is not completed, retransmission processing is performed here.

In this state, in the layer 2 (LAPDM), the I frames 60b and 61a on one logical link
Are transferred as, for example, messages 60 and 61 relating to the plurality of virtual circuits as shown in FIG.
Finally, an RR frame 63 that is a frame for confirming delivery
Is transferred from the receiving side to the transmitting side, and the data transfer control ends.

As described above, in the conventional data transfer control method, data transfer is performed on one logical link by a single flow control.

[0009]

SUMMARY OF THE INVENTION However,
In the conventional data transfer control method, as described above, the delivery of another message transferred next is not completed unless the message lost by retransmission is recovered. That is, since a single flow control is performed for a plurality of independent data transfers (services) of the upper layer, there is a problem that data transfer efficiency is deteriorated.

[0010] This is a problem particularly when services handling long data and services handling short data are mixed. Specifically, in the conventional data transfer control method,
Because the probability of retransmission processing occurring in services that handle long data is high, even services that have a low probability of retransmission processing, such as short data, will wait for the retransmission processing of long data to end. The data transfer efficiency will be reduced. Also, with the above problem, there is also a problem that the transmission confirmation (RR) of the virtual line is delayed, so that there is a high possibility that the subsequent data transfer will be delayed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and is a data transfer control method and a data transfer method capable of improving data transfer efficiency and providing optimum flow control for data transfer of an upper layer. The aim is to obtain a control device.

[0012]

Means for Solving the Problems To solve the above-mentioned problems,
In order to achieve the object, in a data transfer control method according to the present invention, in a process of performing transmission and reception of a layer 3 message performed on a layer 2 logical link in units of flow control, a logic of an upper layer is used. For each channel, an information frame including identification information for identifying flow control is created, and a message in the information frame is
By including a notification step (corresponding to steps S1 to S5 in the embodiment described later) for notifying the logical channel unit of the partner station, flow control within one logical link can be performed in the logical channel unit of the upper layer. It is characterized by being divided into

According to the present invention, the flow control within one logical link is divided for each logical channel of the upper layer, and the retransmission request and the response confirmation are performed for each flow control.

In the data transfer control method according to the next invention, when an information frame being transferred is lost, a retransmission request frame including the identification information is created, and the lost information frame is transmitted to the transmission source station. Retransmission requesting step for requesting retransmission of the packet (corresponding to steps S6 to S8)
Receiving the retransmission request frame, searching for a corresponding information frame, and notifying the other station of a message related to the retransmission information frame other than the information frame notified by the notification step (step S9).
To a step S11) and a transmission confirmation step (corresponding to the steps S12 and S13) of transmitting a number of transmission confirmation frames corresponding to the number of information frames communicated to the transmitting station in units of the identification information. ).

According to the present invention, for example, when a previously transmitted message of a certain logical channel is lost, the transfer of the message of the subsequent logical channel is terminated first. Even when the retransmission processing occurs, there is no need to wait for the end of the retransmission processing in the transfer of the other message.

In the data transfer control method according to the next invention, when an information frame during transfer is lost, a retransmission request frame including the identification information is created, and the information frame lost to the transmission source station is created. Retransmission requesting step for requesting retransmission of the packet (corresponding to steps S6 to S8)
Receiving the retransmission request frame, searching for a corresponding information frame, and notifying the other station of a message related to the retransmission information frame other than the information frame notified by the notification step (step S9).
To step S11), and a multiple delivery confirmation step (step S14) in which a plurality of delivery confirmation frames are transmitted together by including all the identification information in the information frame for which notification has been completed and the retransmission information frame. (Equivalent)).

According to the present invention, by combining a plurality of acknowledgment frames (RR frames) into one frame (MRR frame), the address field assigned to each frame becomes one, and the MRR frame of the MRR frame becomes one. A plurality of frames can be transferred simultaneously with one address field. The data transfer is completed by one MRR frame transmission process.

In the data transfer control method according to the next invention, when an information frame being transferred is lost, a retransmission request frame including the identification information is created, and the retransmission request frame and the lost A transmission confirmation frame corresponding to at least one information frame for which notification has been completed and identification information corresponding to each information frame, respectively, to thereby collectively transmit the acknowledgment frame to the source station. In response to the delivery confirmation step (corresponding to step S6, step S7, and step S15) and the retransmission request frame, a corresponding information frame is searched for, and a retransmission information frame other than the information frame notified in the notification step is searched. Retransmission step of notifying the other station of a related message (steps S9 to S1)
1), and transmits the number of acknowledgment frames corresponding to the number of information frames for which acknowledgment has not been performed in the retransmission request / acknowledgement step to the transmitting station in units of the identification information. And a delivery confirmation step (corresponding to step S16).

According to the present invention, the delivery confirmation frame (R
R frame) and retransmission request frame (SREJ frame,
REJ frame, SREJ 'frame, and REJ'
Frame) into one MRR frame,
The number of address fields added to each frame becomes one, and a plurality of frames can be transferred simultaneously with one address field of the MRR frame. In addition, prompt delivery confirmation using the MRR frame is performed.

In the data transfer control method according to the next invention, the flow control is classified according to the amount of data to be transferred, and a plurality of logical channels are assigned to one flow control.

According to the present invention, instead of specifying a storage circuit (buffer queue) corresponding to the flow control for each logical channel of the upper layer, for example, to reduce the processing load due to an increase in the buffer queue, In order to limit the finite number of buffer queues, flow control is classified according to the amount of data to be transferred, and the number of buffer queues specified in the upper layer is reduced.

In the data transfer control device according to the next invention, the data transfer control device performs the layer 3 operation on the layer 2 logical link.
Message transmission / reception is performed in units of flow control, an information frame including identification information for identifying flow control is created for each logical channel of an upper layer, and a message in the information frame is transmitted to a partner station. The flow control in one logical link is divided into logical channel units of an upper layer by providing a notifying unit (corresponding to FIG. 1) for notifying the logical channel unit.

According to the present invention, the flow control within one logical link is divided for each logical channel of the upper layer, and a retransmission request and a response confirmation are performed for each flow control.

In the data transfer control device according to the next invention, when an information frame being transferred is lost, a retransmission request frame including the identification information is created, and the information frame lost to the transmission source station is created. Retransmission request processing for requesting retransmission of the information, receiving the retransmission request frame, searching for a corresponding information frame, other than the information frame notified by the notifying means, a message related to the retransmission information frame to the other station. A configuration capable of executing a retransmission process of notifying and a delivery confirmation process of transmitting a delivery confirmation frame in a number corresponding to the number of information frames communicated to a source station in units of the identification information, It is characterized by.

According to the present invention, for example, when a previously transmitted message of a certain logical channel is lost, the transfer of the message of the subsequent logical channel is terminated first. Even when the retransmission processing occurs, there is no need to wait for the end of the retransmission processing in the transfer of the other message.

In the data transfer control device according to the next invention, when an information frame being transferred is lost, a retransmission request frame including the identification information is created, and the information frame lost to the transmission source station is created. Retransmission request processing for requesting retransmission of the information, receiving the retransmission request frame, searching for a corresponding information frame, other than the information frame notified by the notifying means, a message related to the retransmission information frame to the other station. It is possible to execute a retransmission process of notifying and a multiple acknowledgment process of transmitting a plurality of acknowledgment frames together by including all the identification information in the information frame for which notification has been completed and the retransmission information frame. It is characterized by comprising a configuration.

According to the present invention, by combining a plurality of acknowledgment frames (RR frames) into one frame (MRR frame), the address field assigned to each frame becomes one, and the MRR frame A plurality of frames can be transferred simultaneously with one address field. The data transfer is completed by one MRR frame transmission process.

In the data transfer control device according to the next invention, when an information frame being transferred is lost, a retransmission request frame including the identification information is created, and the retransmission request frame and the lost A transmission confirmation frame corresponding to at least one information frame for which notification has been completed and identification information corresponding to each information frame, respectively, to thereby collectively transmit the acknowledgment frame to the source station. Delivery confirmation processing, receiving the retransmission request frame, search for the corresponding information frame,
A retransmission process for notifying a partner station of a message related to a retransmission information frame other than the information frame notified by the notification unit, and the retransmission request / delivery to the source station in units of the identification information. And a transmission confirmation process for transmitting a number of transmission confirmation frames corresponding to the number of information frames for which the transmission confirmation has not been performed in the confirmation process.

According to the present invention, the delivery confirmation frame (R
R frame) and retransmission request frame (SREJ frame,
REJ frame, SREJ 'frame, and REJ'
Frame) into one MRR frame,
The number of address fields added to each frame becomes one, and a plurality of frames can be transferred simultaneously with one address field of the MRR frame. In addition, prompt delivery confirmation using the MRR frame is performed.

In the data transfer control device according to the next invention, the flow control is classified according to the amount of data to be transferred, and a plurality of logical channels are assigned to one flow control.

According to the present invention, instead of specifying a storage circuit (buffer queue) corresponding to the flow control for each logical channel of the upper layer, for example, the processing load due to an increase in the buffer queue is reduced, or as a resource. To limit the number of finite buffer queues,
The flow control is classified according to the amount of data to be transferred, and the number of buffer queues specified in the upper layer is reduced.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a data transfer control method and a data transfer control device according to the present invention will be described below in detail with reference to the drawings. The present invention is not limited by the embodiment.

Embodiment 1 FIG.
FIG. 2 is a diagram illustrating a configuration of a data transfer control device per logical link. In FIG. 1, reference numeral 1 denotes a transmission data storage unit for storing transmission data of an upper layer (layer 3);
Reference numerals 1b, 1c, and 1d denote buffer queues for storing transmission data for each upper-layer logical channel. Reference numeral 2 denotes a command management unit for transmitting and receiving unnumbered (U) frames through this logical link. 2b is a buffer queue for storing U frames of the upper layer, 3 is an information frame transmitting unit for transmitting transmission data of the upper layer as an information (I) frame, 11 is an I frame confirmation,
A monitoring frame transmitting unit for transmitting a monitoring (S) frame such as a request for retransmission of a frame and a request for temporarily stopping transmission of an I frame, and 12 is an unnumbered frame transmitting unit for transmitting a U frame. Reference numeral 4 denotes a sequence number management unit that manages a transmission sequence number N (S) and a reception sequence number N (R) that change depending on transmission / reception of an I frame and transmission / reception of a monitoring (S) frame.
Is a unit division unit that divides transmission data into transmission unit units of a lower layer, 5 is a retransmission data management unit that manages the divided transmission data until reception of a delivery confirmation, and 5a to 5d are the divided transmission data. 13 is a data output unit for outputting divided transmission data and retransmission data, 14 is a data input unit for receiving the divided reception data and retransmission data, and 7 is a data input unit for receiving divided transmission data and retransmission data. A unit assembling section that assembles the divided reception data from the lower layer as a frame, 15 is an unnumbered frame receiving section that receives a U frame from the lower layer, and 16 receives an S frame from the lower layer. A supervisory frame receiving unit 8 is a sequence controller for correctly transferring the order of the I frames to the upper layer. Reference numeral 9 denotes an information frame receiving unit that receives an I frame from a lower layer and analyzes the received I frame, 10 denotes a received data storage unit for storing received data, and 10a to 10d: This is a buffer queue for storing data for each logical channel of the upper layer and passing the data to the upper layer. The above configuration exists for each station that performs transmission and reception.

FIG. 2 is a diagram showing a frame format of a frame transmitted and received in the configuration of FIG.
In FIG. 2, the flow control identifications 21b, 22b, 23
b and 23d are parts related to the present invention, and each flow control identification is assigned a number for identifying a single flow control, that is, a number corresponding to the buffer queues 1a to 1d in FIG.

The transmission and reception of these frames will be described later in a data transfer control method (flow control). Also, address fields 21a, 22a, 23
a is assigned a mobile station identifier and a service access point identifier, a sequence number N (S) or N (R) is assigned to the control field 21c, and a sequence number N is assigned to the control fields 22c, 23c and 23e.
(R) is given. Information to be transmitted and received is added to the information field 21d of the I frame.

The operation of the data transfer control device configured as described above will be described below. For example, as a method for transmitting and receiving data by an upper layer, an unnumbered (U)
There are a method using a UI frame of a frame and a method using an I frame of an information (I) frame.

In the data transmission by the UI frame, the data of the upper layer is accumulated in the transmission buffer queue 2a of the command management unit 2, and a transmission request is made to the non-numbered frame transmission unit 12. Then, the UI frame is created by the unnumbered frame transmission unit 12, and the UI frame is further divided by the unit dividing unit 6 that has received the UI frame, and then the data output unit 13 converts the UI frame. Output.

The divided UI frame received by the data input unit 14 is assembled into the original UI frame by the unit assembling unit 7, and further transmitted to the command management unit via the non-numbered frame receiving unit 15. 2, and finally, the stored data is notified to the upper layer. The method of setting the logical link is the same as the conventional method. For example, the SABME frame and the UA frame are transmitted and received on the same route as the UI frame.

On the other hand, in data transmission using I frames,
The transmission data of the upper layer is stored in the transmission buffer queues 1a to 1d for each logical channel, and a transmission request is made to the information frame transmission unit 3. Then, the information frame transmitting unit 3 acquires the sequence numbers N (S) and N (R) from the sequence number managing unit 4, and acquires the buffer queue 1a.
By adding the corresponding flow control identification 21b as header information to .about.1d, an I frame shown in the format of FIG. 2A is created.

Thereafter, the I divided by the unit dividing section 6
The frame is sent to the data output unit 13 and
In preparation for retransmission of a frame, the data is accumulated in the buffer queues 5a to 5d of the retransmission management unit 5. The accumulated I frames are divided for each value of the flow control identification 21b and managed in the buffer queues 5a to 5d.

Here, if the transmitted I frame is lost and the data input unit 14 receives an SREJ frame (divided state) as a retransmission request, the unit assembling unit 7 sets a predetermined SREJ frame. The monitoring frame receiving unit 16 receives the SREJ frame assembled into a frame. Then, based on the instruction of the sequence number management unit 4, the I frame to be retransmitted is read from each of the buffer queues 5 a to 5 d of the retransmission data management unit 5, and the corresponding I frame is output from the data output unit 13. .

However, here, REJ is used as a retransmission request.
Will be operated in the same manner even when receiving Also, when SREJ 'and REJ' which are partial retransmission requests are received, basically the same operation is performed.
From the retransmission data management unit 5, only the units that need retransmission are read.

The divided I frames received by the data input unit 14 are assembled into an original I frame by the unit assembling unit 7 and further transferred to the information frame receiving unit 9. Thereafter, the sequence number management unit 4 checks whether the I frame is missing.
Buffer queues 10a to 10d of received data storage unit 10
And notify the upper layer. Note that the packet is distributed to the buffer queues 10a to 10d based on the flow control identification 21b assigned to the I frame.

If there is a missing I frame, the I frame is temporarily stored in the buffer queues 8a to 8d of the order management unit 8, and waits until the frame order is aligned by retransmission. Buffer queues 8a to 8d
Are sorted by the flow control identification 21b given to the I frame. Then, in order to make a retransmission request, the sequence number management unit 4 instructs the monitoring frame transmission unit 4 to execute the SRE expressed in the format shown in FIG.
J frame, REJ frame, SREJ 'frame, R
Requests transmission of any one of the EJ 'frames, and performs frame transmission via the unit dividing unit 6 and the data output unit 13 in the same manner as the output of the I frame. In addition,
The above-mentioned SREJ frame, REJ frame, SREJ 'frame, and REJ' frame are created for each flow control identification similarly to the I frame.

Next, a first embodiment of the data transfer control method according to the present invention will be described with reference to the drawings. FIG.
FIG. 3 is a diagram illustrating, for example, flow control for transmitting and receiving a layer 3 message as a data transfer control method according to the present invention.

For example, logical channel A data (virtual line A message (1)) transmitted from layer 3 (CC) and logical channel B data (virtual line B
The messages are stored in the buffer queues 1a and 1b for each logical channel, and make a transmission request to the I-frame transmission unit 3 (steps S1 and S in FIG. 3).
2). Here, for convenience of explanation, two messages are transmitted. However, the present invention is not limited to this. For example, the two messages may be appropriately changed according to the number of logical channels, the amount of data, the number of messages, or the like.

Here, the I-frame transmitting unit 3 creates an I-frame based on the virtual line A message (1), for example, assigns FCN = 0 as a flow control identification, Gives the transmission sequence number N (S) = 0. Similarly, create an I frame based on the virtual circuit B message, for example,
FCN = 1 is assigned as the flow control identification, and the transmission sequence number N (S) = 0 is assigned by the sequence number management unit 4. Then, the generated I frame is output via the unit dividing unit 6 and the data output unit 13.

The I frames are output, and these I frames are stored in the buffer queues 5a and 5b of the retransmission data management unit 5 in preparation for retransmission. In this case, for example, the I frame of FCN = 0 is stored in the buffer queue 5a.
And the I frame with FCN = 1 in the buffer queue 5b,
Save each.

Here, in the layer 2 (LAPDM) data transfer, for example, when an error or the like occurs in the I frame of FCN = 0 and is lost (step S3),
Only N = 1 I frames are received by the partner station (step 4). Then, at the partner station, the sequence number management unit 4 confirms that there is no omission in the sequence number at FCN = 1, and the received data in the I frame of FCN = 1 in the information frame receiving unit 9 is transferred to FCN =
1 is accumulated in the buffer queue 10b corresponding to
Only the received virtual circuit B message is notified to the upper layer (CC) (step S5).

After that, when there is a transmission request for the subsequent virtual line A message (2) (step S6), the I frame transmitting unit 3 creates an I frame based on the virtual line A message (2). , FCN = 0 as a flow control identification, and a transmission sequence number N (S) = 1 by the sequence number management unit 4.
Then, the generated I frame is output to the partner station via the unit dividing unit 6 and the data output unit 13 (Step S7). In addition, an I frame of N (S) = 1 is output, and this I frame is stored in the buffer queue 5a of the retransmission data management unit 5 in preparation for retransmission.

Next, FCN = 0 and N (S) = 1
Is received by the partner station (step S7),
The sequence number management unit 4 detects a missing sequence number, that is, detects a missing N (S) = 0,
This I frame is temporarily stored in the buffer queue 8a. At the same time, an SREJ frame (FCN = 0, N (R)) which is a retransmission request from the monitoring frame transmitting unit 11 of the partner station.
= 0) is transmitted (step S8).

Monitoring frame receiving unit 1 of I frame transmission source
6, the SREJ frame (FCN = 0, N (R)
= 0) is received, and is received by the sequence number management unit 4
And the sequence number management unit 4 instructs the retransmission data management unit 5 to retransmit the I frame with FCN = 0 and N (S) = 0. In response, buffer queue 5
From a, FCN = 0 and N (S) previously stored
= 0 is retransmitted (step S9).

After that, when the other station receives the retransmitted I frame, the information frame receiving section 9 checks the sequence number and stores the retransmitted I frame in the buffer queue 10a. At the same time, the information frame receiving unit 9 inquires of the sequence management unit 8 whether there is a subsequent frame,
Here, since the previously received I frame of FCN = 0 and N (S) = 1 is stored in the buffer queue 8a, the data based on this I frame is further stored in the buffer queue 10a. Then, the received data (virtual line A messages (1) and (2)) is notified to the upper layer (steps S10 and S11).

At the other station that has received two I frames with FCN = 0, a timer for transmitting an acknowledgment (RR frame) is activated when the first I frame is received. From the monitoring frame transmitting unit 12, the FCN as shown in FIG.
RR frame corresponding to = 1 (FCN = 1, N (R) =
1) and an RR frame corresponding to FCN = 0 (FCN =
0, N (R) = 2) (step S12,
Step S13).

Finally, at the transmitting station receiving this, the sequence number management unit 4 instructs the retransmission data management unit 5 to release the retransmission data, and the buffer queue 5
When the retransmission data is released from a and 5b, the data transfer control ends.

As described above, in the present embodiment, the flow control within one logical link is divided for each logical channel of the upper layer. More specifically, even if the previously transmitted message of the logical channel A (the virtual circuit A message (1) shown) disappears, the transfer of the subsequent message of the logical channel B (the virtual circuit B message 15) is performed. Can be terminated first.
As a result, for example, even when retransmission processing occurs in the transfer of one message, the data transfer efficiency is greatly reduced as compared with the related art because the retransmission processing of the other message does not have to wait for the end of the retransmission processing. Can be improved.

In this embodiment, in FIG.
Buffer queues 1a to 1 for each logical channel of the upper layer
Although d has been specified, for example, the number of buffer queues specified in an upper layer is reduced in order to reduce the processing load due to an increase in buffer queues or to limit the number of buffer queues that are limited as resources. Is also conceivable. In this case, the upper layer classifies the buffer queue according to the type of data transfer service, for example, according to the amount of data to be transferred, and allocates a plurality of logical channels to one buffer queue. As a result, the processing load in managing the buffer queue can be reduced.

Embodiment 2 In the first embodiment, the RR frame (corresponding to steps S12 and S13) of the delivery confirmation in FIG.
Every). Specifically, an RR frame corresponding to transmission / reception of the virtual circuit A message and an RR frame corresponding to transmission / reception of the virtual circuit B message
The frames were transmitted separately. In the present embodiment, efficient delivery confirmation in the case where a plurality of single flow controls exists (here, MRR in FIG.
(Indicating a frame).

FIG. 4 is a diagram showing a data transfer control method according to the second embodiment which shows the above-mentioned efficient delivery confirmation delivery method. The configuration of the device for implementing the data transfer control method of the second embodiment is the same as the configuration of FIG. 1 described in the first embodiment, and thus the same reference numerals are used. Is omitted.

FIG. 2C shows an acknowledgment frame (R) used in the data transfer control method according to the present invention.
R, SREJ, REJ, SREJ ', REJ'), that is, the frame format of the MRR frame. For example, the MRR frame is provided with an address field similar to the normal RR frame shown in FIG. 2 (b), and the flow control identification and control fields are subsequently provided according to the flow control number (plurality). Is done. That is, in the MRR frame, following the flow control identification (1) 23b and the control field (1) 23c, the flow control identification (2) 23d,
A control field (2) 23e can be provided.

FIG. 5 is a diagram showing the structure of the control field shown in FIG. FIG. 5A shows RR, S
It shows a control field structure for REJ and REJ frames, and includes a format identification 31a and a reception sequence number 32a (corresponding to N (R)). For example, a plurality of control fields are provided like an MRR frame. In this case, the frame identifying each control field is identified using the format identification 31a.

Further, FIG. 5 (b) shows SREJ ', RE
9 shows a control field structure in the case of a J ′ frame, in which a format identification 31b, a reception sequence number 32
b (corresponding to N (R)), and reception division unit sequence numbers 33b (corresponding to n1 (r)) and 34b (corresponding to n2 (r)), which are information for partial retransmission, are included, for example. When a plurality of control fields are provided as in the case of the MRR frame, which frame corresponds to each control field is identified using the format identification 31b.

Hereinafter, a data transfer control method according to this embodiment will be described with reference to FIG. The same parts as those in the method of the first embodiment described above are denoted by the same reference numerals, and description thereof will be omitted. Specifically, step S1
Operations from step S11 to step S11 are omitted for simplicity.

For example, when the retransmission I frame is received by the partner station, the information frame receiving section 9 checks the sequence number and stores the retransmission I frame in the buffer queue 10a. At the same time, the information frame receiving unit 9 inquires of the sequence managing unit 8 whether there is a subsequent frame. Here, the previously received FCN = 0 and N (S) =
Since one I frame is stored in the buffer queue 8a, data based on this I frame is further stored in the buffer queue 10a. Then, the received data (virtual line A messages (1) and (2)) is notified to the upper layer (steps S10 and S11).

Note that the counterpart station that has received the two I frames of FCN = 0 activates a transmission confirmation (RR frame) transmission timer when the first I frame is received. Then, at the same time when the delivery confirmation timer times out, delivery confirmation is performed for FCN = 0 and FCN = 1. Here, in the present embodiment, the first embodiment
Unlike the MRR frame shown in FIG. 2C described above, two RR frames are collectively transmitted. That is, an MRR frame is transmitted. In this case, for flow control identification: FCN = 0, format identification: RR frame sequence number: N (R) = 2
And format identification: RR for FCN = 1
N (R) = 1 of the frame is given and MR is transmitted to the transmitting station.
An R frame is notified (step S14).

Finally, at the transmitting station receiving this, the sequence number management unit 4 instructs the retransmission data management unit 5 to release the retransmission data, and the buffer queue 5
When the retransmission data is released from a and 5b, the data transfer control ends.

As described above, in this embodiment, a plurality of acknowledgment frames (RR frames) are assigned to one MRR.
By combining them into frames, the address field assigned to each frame becomes one, and the MRR
A plurality of frames can be transferred simultaneously by one address field of the frame. As a result, in the present embodiment, in addition to the effects obtained in the first embodiment, it is possible to further improve the line use efficiency, and to further improve the data transfer efficiency. Further, since the data transfer can be completed by one MRR frame transmission process, the processing load required for the transmission process and the transmission time can be reduced.

Embodiment 3 Embodiment 2 is an example in which a plurality of RR frames, which are acknowledgments, are combined into one MRR frame. This embodiment shows a case where an RR frame as a delivery confirmation and an SREJ frame as a retransmission request are combined into one MRR frame.

FIG. 6 shows a case where the RR frame and the SREJ frame are combined into one MRR frame.
FIG. 14 is a diagram illustrating a data transfer control method according to the third embodiment. The configuration of the device for realizing the data transfer control method according to the third embodiment is the same as the configuration in FIG. 1 described in the first embodiment, and thus the same reference numerals are used. Is omitted. Also, the frame format of the MRR frame and the structure of the control field used in the present embodiment are the same as those shown in FIGS.

Hereinafter, a data transfer control method according to the present embodiment will be described with reference to FIG. The same parts as those in the methods of Embodiments 1 and 2 described above are denoted by the same reference numerals, and description thereof will be omitted. Specifically, the operations of steps S1 to S7 and steps S9 to S11 are omitted for simplicity.

For example, in the layer 2 (LAPDM) data transfer, when the I frame of FCN = 0 is lost (step S3), only the I frame of FCN = 1 is received by the partner station (step 4). Then, the partner station converts the data in the I frame of FCN = 1 into F
The buffer is stored in the buffer queue 10b corresponding to CN = 1, and thereafter, only the received virtual circuit B message is notified to the upper layer (CC) (step S5).

Thereafter, when there is a transmission request for the subsequent virtual channel A message (2) (step S6), the transmitting station uses the FCN = 2 based on the virtual channel A message (2).
0 and N (S) = 1 I frame
The frame is divided into the unit division unit 6 and the data output unit 13
Is output to the other station via the terminal (step S7). at the same time,
This I frame is stored in the buffer queue 5a in preparation for retransmission.

Next, FCN = 0 and N (S) = 1
Is received by the partner station (step S7),
At the partner station, a dropout of N (S) = 0 is detected.
The I frame is temporarily stored in the buffer queue 8a, and at the same time, the SREJ frame (FCN = 0, N (R) =
0) will be transmitted.

At this point, since the delivery confirmation timer is started at this point, the other station has FCN = 0 and N
(R) = 0 I frame retransmission request (RR frame)
And the transmission confirmation (SREJ frame) of the I frame with FCN = 1 and N (R) = 0 are simultaneously performed by the MRR frame (step S15). In this case, a format identification: SREJ sequence number: N (R) = 1 is added to the flow control identification: FCN = 0, and a format identification: RR sequence number: N to FCN = 1.
(R) = 1, and notifies the transmitting station of the MRR frame.

Next, in the transmitting station that has received the MRR frame, the monitoring frame receiving unit 16 notifies the sequence number management unit 4 that the acknowledgment for FCN = 1 has been received, and the sequence number management unit 4 In step 4, the data in the buffer queue 5b is released. Further, the monitoring frame receiving unit 16 transmits the F
It notifies that the retransmission request for CN = 0 has been received, and retransmits the corresponding I frame of FCN = 0 and N (S) = 0 from the buffer queue 5a according to the instruction of the sequence number management unit 4 (step S9). .

Thereafter, when the other station receives the retransmitted I frame, the information frame receiving section 9 checks the sequence number and stores the retransmitted I frame in the buffer queue 10a. At the same time, the information frame receiving unit 9 inquires of the sequence management unit 8 whether there is a subsequent frame,
Here, since the previously received I frame of FCN = 0 and N (S) = 1 is stored in the buffer queue 8a, the data based on this I frame is further stored in the buffer queue 10a. Then, the received data (virtual line A messages (1) and (2)) is notified to the upper layer (steps S10 and S11).

Note that the other station that has received two I frames of FCN = 0, at the time of receiving the retransmitted I frame,
Activate a timer for transmission confirmation (RR frame) transmission,
At the same time as the timeout, the RR frame (FCN = 0, N (R) = 2) corresponding to FCN = 0 as shown in FIG. 2B is transmitted from the monitoring frame transmitting unit 12 (step S16).

Finally, in the transmitting station receiving this, the sequence number management unit 4 instructs the retransmission data management unit 5 to release the retransmission data, and the buffer queue 5a
, The data transfer control ends.

As described above, in this embodiment, the RR frame for delivery confirmation and the SREJ frame for retransmission request (including REJ, SREJ ', and REJ') are combined into one MRR frame. The number of address fields added to each frame becomes one, and a plurality of frames can be transferred simultaneously with one address field of the MRR frame. As a result, in the present embodiment, in addition to the effects obtained in the first embodiment, it is possible to further improve the line use efficiency, and to further improve the data transfer efficiency.

Further, delivery confirmation (RR) for FCN = 1
The transmission of the frame does not need to be performed after the acknowledgment timer has timed out, and a quick acknowledgment is performed by the MRR frame. Can be improved.

Embodiment 4 In the first, second, and third embodiments, the operation has been described using LAPDM as an example. However, in this embodiment, the present invention is applied to general data transfer having an HDLC procedure without being limited to LAPDM. In this case, the same effects as those of the first to third embodiments described above can be obtained.

[0082]

As described above, according to the present invention, the flow control within one logical link is divided for each logical channel of the upper layer. As a result, a retransmission request and a response confirmation in a flow control unit can be performed, so that the data transfer efficiency can be improved and a data transfer control method capable of providing optimum flow control for data transfer in an upper layer Is obtained.

According to the next invention, even when the message of a certain logical channel transmitted earlier disappears, the transfer of the message of the subsequent logical channel can be terminated first. Even if resend processing occurs during the transfer of a message, the data transfer efficiency can be greatly improved compared to the conventional system because the resend processing does not wait for the transfer of the other message. Thus, it is possible to obtain a simple data transfer control method.

According to the next invention, by combining a plurality of acknowledgment frames (RR frames) into one frame (MRR frame), the address field assigned to each frame becomes one, and the MRR frame becomes one. A plurality of frames can be transferred simultaneously with one address field. As a result, the line transfer efficiency can be improved, so that the data transfer efficiency can be further improved. Further, since the data transfer can be completed by one MRR frame transmission process, the processing load required for the transmission process can be reduced. And a data transfer control method capable of shortening the transmission time can be obtained.

According to the next invention, an acknowledgment frame (RR frame) and a retransmission request frame (SREJ frame, REJ frame, SREJ 'frame, and RE
By combining (J ′ frame) into one MRR frame, the address field assigned to each frame becomes one, and a plurality of frames can be transferred simultaneously by one address field of the MRR frame. As a result, it is possible to improve the data transfer efficiency because the line utilization efficiency can be improved, and furthermore, since the quick delivery confirmation by the MRR frame is performed, the data transfer using the full standing is performed. It is possible to obtain a data transfer control method capable of greatly improving the throughput.
This has the effect.

According to the next invention, instead of designating a storage circuit (buffer queue) corresponding to the flow control for each logical channel of the upper layer, for example, a processing load due to an increase in the buffer queue is reduced, or resources are reduced. To limit the number of buffer queues that are finite as
The flow control is classified according to the amount of data to be transferred, and the number of buffer queues specified in the upper layer is reduced. As a result, there is an effect that a data transfer control method capable of reducing the processing load in managing the buffer queue can be obtained.

According to the next invention, the flow control within one logical link is divided for each logical channel of the upper layer. As a result, a retransmission request and a response confirmation of a flow control unit can be performed, so that the data transfer efficiency can be improved and a data transfer control device capable of providing optimal flow control for data transfer of an upper layer Is obtained.

According to the next invention, even in the case where the previously transmitted message of a certain logical channel is lost, the transfer of the message of the subsequent logical channel can be terminated first, whereby Even if retransmission processing occurs in the transfer of the other message, there is no need to wait for the end of the retransmission processing in the transfer of the other message, so that it is possible to obtain a data transfer control device capable of greatly improving data transfer efficiency. It has the effect of being able to.

According to the next invention, by combining a plurality of acknowledgment frames (RR frames) into one frame (MRR frame), the address field assigned to each frame becomes one, and the MRR frame becomes one. A plurality of frames can be transferred simultaneously with one address field. As a result, the line transfer efficiency can be improved, so that the data transfer efficiency can be further improved. Further, since the data transfer can be completed by one MRR frame transmission process, the processing load required for the transmission process can be reduced. And a data transfer control device capable of shortening the transmission time can be obtained.

According to the next invention, a delivery confirmation frame (RR frame) and a retransmission request frame (SREJ frame, REJ frame, SREJ 'frame, and RE
By combining (J ′ frame) into one MRR frame, the address field assigned to each frame becomes one, and a plurality of frames can be transferred simultaneously by one address field of the MRR frame. As a result, it is possible to improve the data transfer efficiency because the line utilization efficiency can be improved, and furthermore, since the quick delivery confirmation by the MRR frame is performed, the data transfer using the full standing is performed. It is possible to obtain a data transfer control device capable of greatly improving throughput.
This has the effect.

According to the next invention, instead of designating a storage circuit (buffer queue) corresponding to the flow control for each logical channel of the upper layer, for example, the processing load due to an increase in the buffer queue is reduced, or resources are reduced. To limit the number of buffer queues that are finite as
The flow control is classified according to the amount of data to be transferred, and the number of buffer queues specified in the upper layer is reduced. As a result, there is an effect that a data transfer control device capable of reducing the processing load in managing the buffer queue can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a data transfer control device according to the present invention.

FIG. 2 is a diagram showing a frame format of a frame transmitted and received in the configuration of FIG.

FIG. 3 is a diagram illustrating a data transfer control method according to the first embodiment.

FIG. 4 is a diagram illustrating a data transfer control method according to a second embodiment.

FIG. 5 is a diagram showing a structure of a control field.

FIG. 6 is a diagram illustrating a data transfer control method according to a third embodiment.

FIG. 7 is a diagram showing a conventional data transfer control method defined by LAPDM.

FIG. 8 is a diagram showing flow control in the related art.

[Explanation of symbols]

1 transmission data storage unit, 1a, 1b, 1c, 1d, 2
a, 2b, 5a, 5b, 5c, 5d, 8a, 8b, 8
c, 8d, 10a, 10b, 10c, 10d Buffer queue, 2 command management section, 3 information frame transmission section, 4 sequence number management section, 5 retransmission data management section, 6 unit division section, 7 unit assembly section, 8 sequence management Unit, 9 information frame receiving unit, 10 received data storage unit, 11 supervisory frame transmitting unit, 12 unnumbered frame transmitting unit, 13 data output unit, 14 data input unit, 15 unnumbered frame receiving unit, 16 supervisory frame receiving Part, 21a, 22a, 23a address field, 21b, 22b, 23b, 23d flow control identification, 21c, 22c, 23c, 23e control field, 21d information field, 31a, 31b format identification, 32a, 32b sequence number, 33,
34 Division unit sequence number.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Toshiyuki Kuze 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 5K034 AA03 CC01 CC06 HH08 HH11 HH14 HH17 KK21 KK27 LL07 MM03 MM11 MM15 MM39 NN16 NN25 NN26 SS02

Claims (10)

[Claims] 1. A data transfer control method for performing transmission and reception of a layer 3 message on a layer 2 logical link in units of flow control, wherein identification for identifying flow control is performed in units of logical channels of an upper layer. An information frame including information is created, and a notification step of notifying a message in the information frame in units of the logical channel of the opposite station includes a flow control in one logical link, and a logical control of an upper layer is performed. A data transfer control method, wherein the data transfer is divided into channel units. 2. When a certain information frame is lost during transfer, a retransmission request frame including the identification information is created.
A retransmission requesting step for requesting the source station to retransmit the lost information frame; receiving the retransmission request frame, searching for a corresponding information frame, and retransmitting information other than the information frame notified by the notification step. A retransmission step of notifying a message related to the frame to the partner station, and a transmission confirmation step of transmitting a number of transmission confirmation frames according to the number of information frames communicated to the transmission source station in units of the identification information, The data transfer control method according to claim 1, comprising: 3. When a certain information frame is lost during transfer, a retransmission request frame including the identification information is created.
A retransmission requesting step for requesting the source station to retransmit the lost information frame; receiving the retransmission request frame, searching for a corresponding information frame, and retransmitting information other than the information frame notified by the notification step. A retransmission step of notifying the partner station of a message related to the frame, and multiplexing of transmitting a plurality of acknowledgment frames together by including all of the information frames for which notification has been completed and the identification information in the retransmission information frame. The data transfer control method according to claim 1, further comprising: a delivery confirmation step. 4. When a certain information frame is lost during transfer, a retransmission request frame including the identification information is created.
Further, the retransmission request frame and the acknowledgment frame corresponding to at least one information frame that has been notified without being lost are collectively transmitted by including the identification information corresponding to each information frame. A retransmission request / delivery confirmation step to be transmitted to the original station; receiving the retransmission request frame, searching for a corresponding information frame, and a message related to the retransmission information frame other than the information frame notified in the notification step Retransmission step of notifying the other station of the number of transmissions, and the number of acknowledgments corresponding to the number of information frames for which acknowledgment has not been performed in the retransmission request / delivery acknowledgment step with respect to the source station in units of the identification information. The data transfer control method according to claim 1, further comprising: an acknowledgment step of transmitting a frame. 5. The method according to claim 1, wherein the flow control is classified according to an amount of data to be transferred, and a plurality of logical channels are assigned to one flow control. Data transfer control method. 6. A data transfer control device which performs transmission and reception of a layer 3 message on a layer 2 logical link in units of flow control, wherein identification for identifying flow control in units of logical channels of an upper layer. By providing an information frame including information and notifying means for notifying a message in the information frame in units of the logical channel of the partner station, flow control in one logical link can be performed by the logical operation of the upper layer. A data transfer control device characterized by being divided into channel units. 7. When a certain information frame is lost during transfer, a retransmission request frame including the identification information is created.
Retransmission request processing for requesting the source station to retransmit the lost information frame; receiving the retransmission request frame, searching for a corresponding information frame, and retransmitting information other than the information frame notified by the notifying unit. A retransmission process of notifying a message related to the frame to the partner station, and a transmission confirmation process of transmitting a number of acknowledgment frames in accordance with the number of information frames communicated to the transmitting station in units of the identification information. 7. The data transfer control device according to claim 6, comprising a configuration capable of executing the following. 8. When a certain information frame is lost during transfer, a retransmission request frame including the identification information is created.
Retransmission request processing for requesting the source station to retransmit the lost information frame; receiving the retransmission request frame, searching for a corresponding information frame, and retransmitting information other than the information frame notified by the notifying unit. A retransmission process of notifying a message related to a frame to a partner station, and multiplexing of transmitting a plurality of acknowledgment frames together by including all of the information frames for which notification has been completed and identification information in the retransmission information frame. The data transfer control device according to claim 6, further comprising a configuration capable of executing a delivery confirmation process. 9. When a certain information frame is lost during transfer, a retransmission request frame including the identification information is created,
Furthermore, the retransmission request frame and the acknowledgment frame corresponding to at least one information frame whose notification has been completed without being lost are collectively transmitted by including the identification information corresponding to each information frame. Retransmission request / delivery confirmation processing to be transmitted to the original station; receiving the retransmission request frame, searching for a corresponding information frame, and a message related to the retransmission information frame other than the information frame notified by the notifying unit. Retransmission processing for notifying the other station of the number of transmissions, and the number of transmission confirmations corresponding to the number of information frames for which transmission confirmation has not been performed in the retransmission request / delivery confirmation processing with respect to the transmission source station in units of the identification information. The data transfer control device according to claim 6, further comprising a configuration capable of executing a transmission confirmation process of transmitting a frame. 10. The method according to claim 6, wherein the flow control is classified according to an amount of data to be transferred, and a plurality of logical channels are assigned to one flow control. Data transfer control device.