JPH06338920A - Multi-line control system - Google Patents

Abstract

PURPOSE:To reduce the size of a data area necessary for transmission data so as to save memory by providing a shared transmission data queue for both MLP part(multi-link procedure part) and plural SLP parts(single link procedure parts). CONSTITUTION:In this multi-link control system, an MLP procedure controller provided with the plural SLP procedure parts 2 and the MLP procedure part 1 integrally controlling each SLP procedure part 2 is provided with the shared transmission data queue 3 to which both MLP procedure part 1 and SLP procedure parts 2 can access. Then, the MLP procedure part 1 successively stores transmission data 8 reported from a high-order layer control procedure in the shared transmission data queue 3. The SLP procedure parts 2 refer to the shared transmission data queue 3 when transmission is possible and the part 2 send transmission data to a line by way of a low-order layer control procedure when there is transmission data in the state of waiting for transmission in the shared transmission data queue 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a plurality of user information for one communication in a data communication terminal device connected to a line having a plurality of user information transfer channels such as ISDN (Integrated Services Digital Network). The present invention relates to a multilink control method that is one of the procedures for controlling high-speed data communication by using a transfer channel, and particularly relates to a single-link procedure section (hereinafter, referred to as MLP section) of transmission data in a multilink procedure section (hereinafter, referred to as MLP section) , SLP unit), and efficient realization of processing such as reallocation, and reduction of the data area required for multilink control.

[0002]

2. Description of the Related Art In a communication control unit based on the OSI 7-layer model, as a control procedure for controlling the second layer (hereinafter, referred to as a data link layer), a LAPB procedure defined by CCITT recommendation or TTC standard. There is. In the LAPB procedure, when there are a plurality of first layer (hereinafter, physical layer) entities (hereinafter, physical layer control units), an SLP that is a mechanism for controlling a single data link for each physical layer. Department,
The data link layer is controlled by the MLP unit that collectively manages the plurality of SLP units.

In the above structure, the SLP unit controls data transfer between each physical layer control unit and the MLP unit, and
The P unit controls data transfer between each SLP unit and a third layer (hereinafter, referred to as network layer) entity (hereinafter, referred to as network layer control unit).

FIG. 2 shows a conventional module configuration in the case of controlling a multilink with a configuration including an MLP unit and a plurality of SLP units.

As shown in FIG. 2, conventionally, in order to manage transmission data in the multi-link control system composed of the MLP unit 1 and a plurality of SLP units 2, the M
The LP unit 1 can confirm the delivery of the transmission data assigned to each SLP unit 2, and the SLP unit 2 can confirm the delivery of the transmission data transmitted to the partner SLP unit via the corresponding physical layer control unit 5. Up to the transmission data queues 6 and 7 for temporarily storing the transmission data
Had to have.

[0006]

In the case of the conventional multi-link control module configuration as shown in FIG. 2, the MLP is used.
The size of the MLP unit transmission data queue 6 (where multi-link frames are stored) used by the unit 1 is set to be all transmission data waiting for delivery confirmation from each SLP unit 2 and waiting for allocation to the SLP unit 2. Must be able to hold. Therefore, the size of the data area of the MLP transmission data queue 6 is the maximum number of SLP units 2 managed by the MLP unit “n”, and the size of each SLP transmission data queue 7 corresponding to each SLP unit 2. Is about “n × S”, and if the size of each SLP unit transmission data queue 7 used by each SLP unit 2 is also added, the data area required for performing multilink control is The total size is “2 × n × S”.

Here, the data area when the multi-link control is not performed is the size of the data area excluding the MLP unit transmission data queue 6, that is, "n × S",
The size of the data area when performing multilink control is
There is a problem that the size of the data area is about twice as large as when the multi-link control is not performed.

Further, in the configuration shown in FIG. 2, when data is transmitted from the network layer control unit 4, the transmission data requested to be transmitted from the network layer control unit 4 to the MLP unit 1 is multi-linked by the MLP unit 1. The data is temporarily stored in the MLP transmission data queue 6 in the form of a frame. Furthermore, if there is an available SLP unit 2 (data link setting completed), the MLP unit 1 extracts from the MLP unit transmission data queue 6 transmission data (multilink frame) waiting for allocation. , Select one SLP unit 2 from any of the available SLP units 2,
The extracted transmission data is assigned to the selected SLP unit 2.

SLP unit 2 to which transmission data is assigned
Stores the allocated transmission data in the SLP unit transmission data queue 7 corresponding to the SLP unit 2.
If the physical layer control unit 5 corresponding to the unit 2 and the SLP unit 2 is in a data transmittable state, the transmission data (information transfer (I) frame) waiting for transmission is taken out from the SLP unit transmission data queue 6 and the physical data is transmitted. The procedure is to transfer the data to the layer control unit 5, and there is a problem that the amount of transmission data movement is large and control becomes complicated.

Further, when a plurality of SLP units 2 are available in the process of allocating transmission data to the SLP unit 2 by the MLP unit 1, conventionally, in a fixed order (for example, two The transmission data is allocated alternately when the SLP unit 2 is available.) Since the transmission data was allocated, depending on the transmission delay of each SLP unit 2 and the error condition of the line, it is allocated to any SLP unit 2 first. It is more likely that the transmitted data will reach the receiving side later than the transmitted data assigned to another SLP unit 2 thereafter.
There is also a problem that the overhead for reordering the received data on the receiving side becomes large.

In view of the above conventional problems, the present invention reduces the size of the data area required for transmission data control to save memory, speeds up execution speed, and improves throughput. The purpose is to provide a link control method.

[0012]

In order to achieve the above object, a multi-link procedure control device having a plurality of single-link procedure sections and a multi-link procedure section that manages each of the single-link procedure sections in an integrated manner. In, the multi-link procedure unit and the single-link procedure unit has a shared transmission data queue accessible to both, the multi-link procedure unit, the transmission data notified from the upper layer control procedure to the shared transmission data queue Sequentially storing, the single link procedure unit refers to the shared transmission data queue when it is in a transmittable state, and when there is transmission data in a transmission waiting state in this shared transmission data queue,
The transmission data is transmitted to the line via the lower layer control procedure.

[0013]

With the above structure, according to the multilink control system of the present invention, the size of the data area particularly required for transmission data control of the multilink control is the structure in the conventional multilink control system shown in FIG. It becomes possible to reduce to about one half when compared with.

Further, since the transmission data queue is shared by the MLP unit and a plurality of SLP units, the transfer of the transmission data from the transmission data queue for the MLP unit to the transmission data queue for the SLP unit, which is necessary in the configuration of FIG. , SL required for confirming delivery of the multi-link frame on the transmission data queue for the MLP part at the time of confirming delivery of the information transfer frame
A delivery confirmation notification or the like from the P unit to the MLP unit is unnecessary, and the frame transmission process can be simplified.

Further, instead of allocating transmission data to an arbitrary SLP section by the MLP section in the conventional multilink control method, the available SLP section in the multilink control method of the present invention is put into a state in which data can be transmitted. SLP in which data transmission is disabled by the MLP unit in order to positively retrieve and transmit old transmission data waiting to be transmitted from the shared transmission data queue
It is possible to reduce the overhead for reordering the received data on the receiving side, since the transmission data is not allocated to the unit.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the multilink control system of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a module configuration diagram of a multilink control system according to an embodiment of the present invention. In the figure, ML
The P unit 1 stores the transmission data transferred from the network layer control unit 4 in a shared transmission data queue (a transmission data queue that can be accessed by the MLP unit 1 and a plurality of SLP units 2) 3 and The unit 2 takes out the transmission data in the transmission waiting state from the shared transmission data queue 3 and transfers it to the physical layer control unit 5 to control the data transmission in the multilink.

Also, transmitted data (information transfer frame)
When confirming the delivery, the SLP unit 2 releases the corresponding transmission data on the shared transmission data queue 3 from the shared transmission data queue 3 so that the transmission confirmation received by the MLP unit 1 in the past is received. The release processing of the multilink frame, which was performed for confirming the delivery of the multilink frame corresponding to the completed data, can also be performed.

On the shared transmission data queue 3,
The transmitted data is an information transfer frame at the SLP unit 2 level and a multilink frame at the MLP unit 1 level, and the transmitted and undelivered transmission data on the shared transmission data queue 3 is always the MLP unit 1 and one. S
It is pointed by the LP unit 2.

3 and 4 are diagrams showing an example of the flow of transmission data when data is transmitted by the multilink control method of the present invention. In the figure, transmission data 81 to 8 transferred from the network layer control unit 4 to the MLP unit 1
m is set by the MLP unit 1 according to the procedure shown in FIG.
The multi-link frames 91 to 9m are stored in the shared transmission data queue 3. Then, the SLP unit 2 takes out the transmission data 91 to 9m waiting to be transmitted from the shared transmission data queue 3 according to the procedure shown in FIG.
In the form of the information transfer frame 10 with a control unit added, the S
It is transferred to the physical layer control unit 5 corresponding to the LP unit 2.

FIG. 5 is a flow chart showing an example of the operation relating to the frame transmission processing of the MLP unit 1 in the multilink control system of the present invention. In the figure, MLP
When the transmission data is transferred from the network layer control unit 4 (step S1: Yes), the unit 1 adds an MLC (multilink control unit) to the transferred transmission data to form a multilink frame (step S2),
The transmission data in the multilink frame format is sequentially stored in the shared transmission data queue 3 (step S
3). If there is any available SLP unit 2 (step S4: Yes), the arbitrary SLP unit 2 is requested to transmit the transmission data on the shared transmission data queue 3 (step S5).

FIG. 6 is a flow chart showing an example of the operation relating to the frame transmission processing of the SLP section 2 in the multilink control system of the present invention. In the figure, SLP
The unit 2 receives the transmission request from the physical layer control unit 5 corresponding to the MLP unit 1 or the SLP unit 2 (step S1).
If the SLP unit 2 is in a data transmittable state (step S12: Yes), the shared transmission data queue 3 is referred to. If there is transmission data waiting to be transmitted in the shared transmission data queue 3 (step S13: Ye
s), the transmission data waiting to be transmitted is taken out from the shared transmission data queue 3 (step S14), an HDLC header (address field, control field) is added to the transmission data, and in the form of an information transfer frame (step S15). , The physical layer control unit 5 corresponding to the SLP unit 2
(Step S16). The "transmission request" in step S11 is generated under the following conditions.

(1) When the MLP unit 1 stores transmission data in the shared transmission data queue 3, the MLP unit 1 issues it (step S5).

(2) It occurs at the moment when the SLP unit 2 changes from the transmission disabled state to the transmission enabled state.

The "state in which the SLP unit 2 cannot transmit" in (1) above means any one of the following states. That is, the physical layer control unit 5 corresponding to the SLP unit 2 is busy (data is being transmitted, etc.), the SLP unit 2 of the transmission destination is in the reception busy state, or transmission data for the transmission window size (k parameter) is transmitted. It is in the state of being sent.

The present invention is not limited to the illustrated embodiment, and various modifications can be made. The following are examples of such modifications.

In the above embodiment, the multilink control is performed by the MLP unit 1 and the plurality of SLP units 2 of the data link layer. However, even when the multilink control is performed by another procedure, for example, a plurality of networks are used. A multilink control system configured by a module for controlling a single link and a module for centrally managing the single link, such as multilink control by the layer control unit 4 and an entity of the fourth layer (transport layer control unit) If so, the control by the shared transmission data queue can be applied as in the above-described embodiment.

[0028]

As described above in detail, according to the present invention, by providing a shared transmission data queue that can be accessed by both the MLP unit and a plurality of SLP units, particularly in transmission data control among multilink control. The size of the required data area can be reduced to about one half as compared with the configuration in the conventional multi-link control system, which has an effect of saving memory.

Since the transmission data queue is shared by the MLP unit and the plurality of SLP units, the amount of movement of the transmission data can be reduced and the processing can be simplified, so that the execution speed can be increased. There is an effect.

Further, in order to sequentially take out the data waiting to be transmitted from the shared transmission data queue and transmit the data when the transmittable SLP unit becomes ready for data transmission, a conventional multilink control system is used. In comparison with the case where the MLP unit allocates the transmission data to any SLP unit regardless of the state of the SLP unit, the overhead due to the reordering process of the reception data performed on the reception side can be reduced, and the throughput is improved. There is an effect of doing.

[Brief description of drawings]

FIG. 1 is a module configuration diagram showing an embodiment of a multilink control system of the present invention.

FIG. 2 is a module configuration diagram showing an example of a conventional multilink control system.

FIG. 3 is a diagram showing an example of a flow of transmission data in the multilink control system of the present embodiment.

FIG. 4 is a continuation of FIG. 3.

FIG. 5: ML in the multilink control system of the present embodiment
6 is a flowchart showing an example of a data transmission operation of P section 1.

FIG. 6 is an SL in the multilink control system of this embodiment.
6 is a flowchart showing an example of a data transmission operation of P section 2.

[Explanation of symbols]

 1 multi-link procedure section 2 single-link procedure section 3 shared transmission data queue 4 network layer control section 5 physical layer control section 6 MLP section transmission data queue 7 SLP section transmission data queue 8 transmission data 9 multi-link frame 10 information transfer frame

Claims (1)

[Claims] 1. A multi-link procedure control device comprising a plurality of single-link procedure sections and a multi-link procedure section for centrally managing each of the single-link procedure sections, wherein the multi-link procedure section and the single-link procedure are provided. Units have a shared transmission data queue that can be accessed together, the multi-link procedure unit sequentially stores the transmission data notified from the upper layer control procedure in the shared transmission data queue, the single-link procedure unit, the transmission When the shared transmission data queue is in a possible state, the shared transmission data queue is referred to. If there is transmission data in the transmission waiting state in this shared transmission data queue, the transmission data is sent to the line through the lower layer control procedure. A multilink control method characterized in that