JP3255238B2 - Communication control processor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication control processor connected to a plurality of types of communication networks and performing communication control by a hierarchical protocol.

[0002]

2. Description of the Related Art In OSI (Open System Interconnection), functions for realizing communication between end nodes are defined in seven layers, and they are provided with a communication function for transferring data transparently and efficiently. It can be broadly divided into a lower layer to handle and an upper layer to handle communication functions depending on the application. Since a plurality of functions and protocols exist in each of the upper layer and the lower layer, it is general that each protocol processing unit is divided into a plurality of parts and mounted.

In the communication control processor, when selecting a lower processing unit for performing lower layer protocol processing at the time of outgoing call, and selecting an upper processing unit for performing upper layer protocol processing at the time of incoming call, a network address (NSAP), Network address (sub-NSAP) and routing information are used. The correspondence between these combinations and each processing unit is defined in advance as a decision table or selection logic, and is used by each processing unit when making and receiving calls.

[0004] A network address is an address for identifying a communication subject (node) in a network, and is called a network service access point address (NSAP address) in OSI, and communicates using a plurality of communication networks. In this case, it is expressed in a format independent of the network. The subnetwork address is an address for identifying a subscriber of a public network or a private network, and corresponds to a DTE address in the case of a public network. Further, the route information depends on the mounting state, and generally, information corresponding to a quality of service (QOS) parameter defined by the type of transit network and OSI is used.

Here, an example of a physical configuration of a network is shown in FIG. In the network shown here, a node 1 and a node 2 are connected via a communication network A and a communication network B,
Nodes 1 and 3 are connected via a communication network B.

FIG. 7 shows a relationship between an OSI network address (NSAP) and a route for such a network.
Shown in Node 1 has NSAP10 and NSAP11
Are defined, and nodes 2 and 3 each have N
SAP 20 and NSAP 30 are defined. NSAP
Two paths are prepared for communication between the NSAP 10 (node 1) and the NSAP 20 (node 2), and the NSAP 10 (node 1)
One path is prepared for communication between the NSAP 30 and the node 3 (node 3). NSAP11 (node 1) and N
For communication between the SAP 20 (node 2) and the NSAP 30 (node 3), one path is prepared for each. Here, the routes are, for example, NSAP10 and NSAP
Between sub NSAP1A and sub NSAP
It refers to a sub-NSAP pair such as 2A. The sub-NSAP is given to the line by the DTE numbers of the communication networks A and B.

[0007]

It is desirable that the upper processing unit and the lower processing unit are flexibly combined and mounted according to the type of communication network to be accommodated and the communication purpose. Was directly associated.

One of the factors is that the provision of a plurality of upper processing units and lower processing units complicates the function of controlling the connection relationship of a decision table and the like in proportion to the number of combinations of the two. . On the other hand, even if this complexity can be overcome and the flexibility of combination is realized, the function is conventionally built in each processing unit, so that the flexibility for adding the upper processing unit and the lower processing unit is reduced. I was

Another factor is that the upper processing unit cannot grasp the status of the transit network or the partner sub-NSAP.
And the combination of protocols and routes was restricted. That is, the correspondence between the partner NSAP, the lower protocol, and the transit network is generally 1: n: m, but the upper processing unit does not know the path state (normal or faulty), so the lower protocol must be effectively selected. Can not. Therefore, the partner NSAP and the lower protocol or the partner NSAP and the transit network must be limited to 1: 1.

The present invention provides a communication control processing device which can easily add a high-order processing unit and a low-order processing unit and can realize a flexible combination of a network address, a high-order processing unit and a low-order processing unit, and a route. The purpose is to do.

[0011]

According to a first aspect of the present invention, there is provided an upper processing unit for performing upper layer protocol processing, a lower processing unit for performing lower layer protocol processing, address information, route information, and a configuration of each processing unit. Separately provided module selectors for providing the corresponding upper connection terminal and lower connection terminal for the resource management unit to be managed, the upper processing unit and the lower processing unit, and the module selection unit is managed by the resource management unit when a connection is created. It is characterized in that the upper processing unit and the lower processing unit are dynamically associated with each other using each piece of information.

According to a second aspect of the present invention, in the communication control processing device according to the first aspect, the communication control processing device has a configuration in which a higher-level processing unit and a module selection unit are integrated. According to a third aspect of the present invention, in the communication control processing device according to the first aspect, the communication control processing device has a configuration in which a lower processing unit and a module selection unit are integrated.

[0013]

According to the first aspect of the present invention, at the time of transmission, the resource management unit determines a communicable path, a lower layer protocol used on the path, and a corresponding lower processing unit based on the address information (network address). select. Using the information selected by the resource management unit, the module selection unit dynamically associates the upper connection terminal with the lower connection terminal and notifies the lower processing unit of the path information, thereby providing the upper processing unit and the lower processing unit. Can be dynamically associated.

When an incoming call is received, the resource management unit selects a corresponding upper processing unit based on the incoming route, lower layer protocol, and address information (network address). The module selection unit dynamically associates the upper connection terminal with the lower connection terminal by using the information selected by the resource management unit, thereby performing the dynamic association between the upper processing unit and the lower processing unit. it can.

According to the second aspect of the present invention, the high-order processing unit and the module selecting unit are integrated to omit the dynamic association with the high-order processing unit, but the association with the low-order processing unit is performed dynamically. Accordingly, it is also possible to dynamically associate the upper processing unit and the lower processing unit.

According to the third aspect of the present invention, the lower processing unit and the module selecting unit are integrated to omit the dynamic association with the lower processing unit, but the association with the upper processing unit is dynamically performed. Accordingly, it is also possible to dynamically associate the upper processing unit and the lower processing unit.

[0017]

FIG. 1 is a block diagram showing the configuration of an embodiment of a communication control processing apparatus according to the present invention. Hereinafter, in the present embodiment, a case where it is mounted on the node 1 (NSAP 10) in FIGS. 6 and 7 will be described.

In the figure, the communication control processing device has a sub-N
It is connected to a communication network A via a control terminal 1A corresponding to the SAP 1A, and connected to a communication network B via a control terminal 1B corresponding to the sub-NSAP 1B. Upper processing units 101 and 102 for performing upper layer protocol processing and lower processing units 103 and 104 for performing lower layer protocol processing include upper connection terminals 1001 and 1002 provided by the module selector 100.
And lower coupling terminals 1003 and 1004. The resource management unit 105 includes a module selection unit 100, upper processing units 101 and 102, and a lower processing unit 10.
3, 104 independently. The lower processing unit 10
3 and 104 are both connected to the control terminals 1A and 1B.

Before describing the operation of this embodiment, the following five items are assumed for convenience of explanation. NSAP can be transferred by a lower layer protocol.

The upper processing unit 101 processes the upper layer protocol P1, and the upper processing unit 102
Process 2. The lower processing unit 103 processes the lower layer protocol P3, and the lower processing unit 104 processes the lower layer protocol P4. Note that P3 can be used only in the communication network B, and P4 can be used in the communication networks A and B.

At the time of transmission, the resource management unit 105
The network type used for communication with the SAP is selected, and the module type is notified to the module selection unit 100. The lower processing units 103 and 104 obtain control information and the like necessary for the final route and communication in cooperation with the resource management unit 105.

The upper processing units 101 and 102 have the same access interface. Similarly, the lower processing unit 10
3, 104 have the same access interface. Here, an example of the path information managed by the resource management unit 105 is shown in FIG.

The operation of the module selection unit 100 shown in FIGS. 3 and 4 and the operation of the module selection unit 100 and the resource management unit 105 shown in FIG. The operation of this embodiment will be described focusing on the functions of the resource management unit 105.

First, an operation example at the time of transmission will be described with reference to FIGS. Here, one upper processing unit 101 is used, and the lower processing unit 10
The example which selects 3,104 is shown. As can be seen from the route information in FIGS. 6 and 2, the route to the NSAP 20 is the communication network A.
And the communication network B, and the lower-layer protocol that can be used is different for each path.

(1) The module selection unit 100 provides a service for registering the attributes of the upper processing unit 101 and the lower processing units 103 and 104, and a service for deleting registration information. In addition, the attribute of each processing unit required for selecting each processing unit is acquired at the time of attribute registration, and the upper connection terminal 1001 and the lower connection terminals 1003 and 1004 are associated with each other. The upper processing unit 101 and the lower processing unit 10 in this example
The attributes of 3, 104 are protocols P1, P3, P4 that can be processed by each processing unit.

(2) When the module selection unit 100 receives a connection creation request from the higher-level processing unit 101 to the NSAP 20, the resource management unit 105 instructs the module selection unit 100 to (a) select a route / protocol, and (b) Provides a service for selecting its own NSAP.

That is, in (a) route / protocol selection, the destination (NSAP 20) and the attribute (P1) of the higher-level processing unit 101 are used as input parameters, and the type of communicable network (communication network B) and the lower-level processing unit to be used are used. The attribute (P3) is output. (b) In the selection of the own NSAP, the destination (NSAP2
0), the attributes (P1, P
3) using NSAP of its own system as an input parameter
(NSAP10) is selected.

(3) The module selection unit 100, based on the path information obtained from the service (a) of the resource management unit 105 and the attribute of the lower processing unit, establishes a connection terminal 1001 corresponding to each of the upper processing unit and the lower processing unit. Associated with the coupling terminal 1003,
The lower processing unit 1 sends a connection creation request to the NSAP 20
Tell 03. At this time, the service of the resource management unit 105
The information obtained from (a) and (b) is transmitted to the lower layer.

As described above, the host processor 101 (NS)
In response to a connection generation request from the AP 10), the module selection unit 100 can dynamically select a lower processing unit, and the two are connected until a connection release request is issued from the upper processing unit 101.

(4) When the connection is released in response to a connection release request from the upper processing unit 101, the association of the connection terminal corresponding to each of the upper processing unit and the lower processing unit is released.

Next, with reference to FIGS. 4 and 5, an operation example at the time of an incoming call will be described. Here, an example is shown in which one lower processing unit 104 is used and a higher processing unit is selected by its own NSAP.

(1) The module selection unit 100 provides a service for registering the attributes of the upper processing units 101 and 102 and the lower processing unit 104 and a service for deleting registration information. Also, at the time of attribute registration, the attribute of each processing unit required for selecting each processing unit is acquired, and the upper connection terminals 1001 and 1002 are acquired.
And the lower coupling terminal 1004. Note that the attributes of the upper processing units 101 and 102 and the lower processing unit 104 in this example are based on the protocol P that can be processed by each processing unit.
1, P2 and P4.

(2) When the module selection unit 100 receives a connection generation instruction from the lower processing unit 104, the resource management unit 105 provides (c) an incoming call check service to the module selection unit 100.

That is, (c) In the incoming call check, the address information (incoming NSAP 11, outgoing NS
The AP 30) checks whether the incoming call can be received. If the incoming call is accepted, the incoming call notification destination is determined from the address information and the attribute (P4) of the lower processing unit, and the attribute (P1) of the upper processing unit is output.

(3) The module selection unit 100 checks whether or not the call can be received from the information obtained from the service (c) of the resource management unit 105. If the reception is possible, the module information and the address information acquired at the time of the call and the upper processing unit The connection terminal 1001 and the connection terminal 1004 corresponding to each of the upper processing unit and the lower processing unit are associated with each other, and a connection generation instruction with the NSAP 30 is transmitted to the upper processing unit 101 based on the connection state.

In this way, the lower processing unit 104 (NS
In response to a connection generation instruction from the AP 30), the module selection unit 100 can dynamically select an upper processing unit, and the two are connected until a connection release instruction is issued from the lower processing unit 104.

(4) When a connection is released by a connection release response from the higher-level processing unit 101 in response to a connection release instruction from the lower-level processing unit 104, the connection of the connection terminal corresponding to each of the higher-level processing unit and the lower-level processing unit Is released.

The functions of the module selection unit 100 and the resource management unit 105 have been described above for outgoing calls and incoming calls. The functions shown in (1) to (4) for outgoing calls and incoming calls are described below. It corresponds.

For the function (1), if the connection state between the upper processing unit and the lower processing unit and the module selection unit does not change during the operation period of the communication control processing device, the module selection unit is installed at the time of installation. This can be omitted by storing each attribute of the processing unit and the lower processing unit.

As a part of the service (a) of the function (2), a sub NSAP corresponding to a route to the destination NSAP may be obtained. In addition, service (a) of function (2)
A QOS parameter or the like may be used as an input to.

When the own NSAP is used as an attribute of the upper processing unit and the lower processing unit, the service (b) of the function (2) may be omitted. Further, when it is not necessary to divide one of the upper processing unit and the lower processing unit into a plurality of units, the module selecting unit and the upper processing unit or the lower processing unit can be integrated. 3).

Further, in the function (3), since the upper processing unit and the lower processing unit are associated with each other on a connection basis, the module selecting unit may independently define the connection end point identifier.

In the functions (3) and (4), when the access interfaces of the upper processing unit and the lower processing unit are different, it is necessary to convert the access interface by the module selection unit.

As the route information, a sub-NSAP may be used in addition to the NSAP.

[0045]

As described above, the communication control processing device of the present invention can communicate with a free combination of an upper processing unit for processing an upper layer protocol and a lower processing unit for processing a lower layer protocol. Become. Therefore, it is possible to flexibly cope with the addition of a new communication network or protocol, and it is possible to easily expand functions.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a communication control processing device according to the present invention.

FIG. 2 is a diagram showing an example of path information managed by a resource management unit 105.

FIG. 3 is a diagram showing an example of an operation sequence (at the time of transmission) centering on a module selection unit 100;

FIG. 4 is a diagram showing an example of an operation sequence (at the time of an incoming call) centering on the module selection unit 100;

FIG. 5 is a diagram showing an operation sequence example of a module selection unit 100 and a resource management unit 105.

FIG. 6 is a diagram illustrating an example of a physical configuration of a network.

FIG. 7 is a diagram showing a relationship between NSAP and a route.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 Module selection unit 101, 102 Upper processing unit 103, 104 Lower processing unit 105 Resource management unit 1001, 1002, 1003, 1004 Coupling terminal 1A, 1B Control terminal

Continuation of the front page (73) Patent holder 000005223 Fujitsu Limited 4-1-1, Kamidadanaka, Nakahara-ku, Kawasaki-shi, Kanagawa (72) Inventor Hiroshi Yamaguchi 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone stock Inside the company (72) Inventor Shouchi Takeuchi 223-1 Yamashita-cho, Naka-ku, Yokohama-shi, Kanagawa Prefecture NTT Software Corporation (72) Inventor Chifuya Tamiya 5-7-1 Shiba, Minato-ku, Tokyo No. NEC Corporation (72) Inventor Akira Hasegawa 5030 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Software Development Division, Hitachi, Ltd. In-company (56) References JP-A-2-12549 (JP, A) JP-A-62-222547 (JP, A) JP-A-4-215157 (JP, A) JP-A-3-178245 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04L 29/10 H04L 12/02 H04L 29/04

Claims (3)

(57) [Claims] An upper processing unit for performing upper layer protocol processing, a lower processing unit for performing lower layer protocol processing, a resource management unit for managing address information, route information, and a configuration of each processing unit, an upper processing unit, A module selection unit that provides a corresponding upper connection terminal and a lower connection terminal for the lower processing unit is separately provided, and the module selection unit uses each information managed by the resource management unit when a connection is generated. A communication control processing device, wherein the upper processing unit and the lower processing unit are dynamically associated with each other. 2. The communication control processing device according to claim 1, wherein the communication control processing device has a configuration in which a higher-order processing unit and a module selection unit are integrated. 3. The communication control processing device according to claim 1, wherein the lower-level processing unit and the module selection unit are integrated.