JP3317756B2 - Interface method between service control layer and transmission control layer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is divided into a transmission layer having an exchange basic function including a basic service constituted by a plurality of transmission nodes and a service control layer for controlling an exchange service constituted by a plurality of service control nodes. The interface between the service control layer and the transmission control layer in an existing network.

In recent years, diversification and customization of services have been promoted in response to requests for exchange services. In order to cope with these problems, in the conventional switching system, the basic function of the exchange and the exchange service are integrally developed, so that it takes a lot of cost to develop the technology for providing the service and to cope with the change of the service.

[0003]

2. Description of the Related Art In a current switching system, a call from a subscriber terminal is detected, and basic functions such as reception of connection information (dial), analysis of connection information, control of a switch, and various services and calls using a special number are provided. Various exchange services such as a conference service required during the development have been developed in unison. That is, software is developed in a form that combines the basic function and the exchange service, and the basic function and the exchange service are also constituted by the same exchange device on the hardware.

[0004]

As described above, in the conventional switching system, a basic function and a switching service are developed and operated as one body. For this reason, in the current switching system, when the switching service is re-tested or changed, the combined switching basic function is improved, so that the reliability of the switching basic function is sacrificed and the switching service cannot be easily developed.

On the other hand, recent diversification and customization of exchange services have been demanded, and accordingly, it has become a problem how to easily develop exchange services and provide them in a timely manner.

The present invention provides an interface system between a service control layer and a transmission layer in a network in which a switching service in a switching system can be easily developed and additions and changes can be dealt with without improving the basic switching function. The purpose is to provide.

[0007]

FIG. 1 is a block diagram showing the principle of the present invention. In FIG. 1, 1 is a transmission layer, 2 is a subscriber transmission node constituting the transmission layer, 2 'is a relay transmission node in the transmission layer, 2a and 2b are means connected to the interface 3 and 2a. Is a service activation instruction means, 2b
Is a basic service resuming means, 3 is an interface abstracting (virtualized) a network between the transmission layer and the service control layer, 4 is a service control layer, 5 is one or a plurality of service control nodes constituting the service control layer, 5a ,
5b is a means connected to the interface 3, 5a is a service generating means, and 5b is a basic service restart instructing means.

The present invention separates the switching function into a transmission layer and a service control layer in order to increase the reliability of the basic switching function, and arranges the switching basic function in the transmission layer and various switching services in the service control layer. An interface that virtualizes the network is defined between the transmission layer and the service control layer in order to facilitate the development of the switching service by being deployed.

[0009]

In FIG. 1, a transmission layer 1 is connected to a subscriber, a switching basic function is provided (assigned) to each subscriber transmission node 2, and service control is performed by a basic function in the call control for each subscriber. Control is performed in the transmission layer 1 while having the right (or call control right). here,
When a request to start the exchange service provided in the service control layer 4 occurs in the transmission layer 1, the service start instruction means 2a detects this and sends a service start instruction to the service control layer 4 via the interface 3.
In the service control node 5 of the service control layer 4,
Upon receiving the service activation instruction, the service control right is transferred to the service control layer, and the service generating means 5a generates the corresponding service and executes the service specified by the transferred service control right.

When this service is completed in the service control node 5, the basic service restart instructing means 5b is driven, and the basic service restart instruction is sent to the subscriber transmission node 2 which has requested the service of the transmission layer 1 by the interface 3, and the subscription is started. Upon receipt of the service request, the service control right is transferred again, and the basic service resuming means 2b restarts the basic service which has disappeared after generating the service request.

As described above, the service control right can be flexibly moved between the transmission layer and the service control layer, and the control range executed by the service control layer is minimized to limit the development range of the exchange service. The exchange service can be easily developed.

[0012]

FIG. 2 is an explanatory diagram of the operation of transferring the service control right in the switching system of the present invention, and FIG. 3 is an explanatory diagram of the operation of returning the service control right to the transmission node in the switching system of the present invention.

2 and 3, reference numeral 10 denotes a transmission network corresponding to a transmission layer (1 in FIG. 1), and reference numerals 2 and 2 ', 3 denote constituent units similar to those in FIG. These are relay transmission nodes and interfaces. Reference numeral 5 denotes one service control node constituting a service control network (a network corresponding to the service control layer 4 in FIG. 1), and reference numeral 6 denotes a subscriber terminal (for example, a telephone).

The service control right transfer operation shown in FIG. 2 will be described in the order of operation shown in FIG. In the subscriber transmission node 2 of the transmission network 10, while a service (for example, a basic service) provided in the transmission network 10 is being executed for the subscriber terminal 6, the subscriber terminal 6 is provided in the service control network in an arbitrary transmission node. When an event requesting a specific service (hereinafter referred to as service A) is detected, a call control right transfer message instructing the transfer of the service control right is issued to the service control node 5.

An event requesting a service is, for example,
Failure to acquire resources for performing basic services, reception of special dialed digits, reception of some signal information, and the like.

When the service control node 5 receives the call control right transfer message, it determines a corresponding service A based on the message information, generates a service A process (including a service A scenario), and The control right is set to the service A.

When the setting of the service control right is completed, a confirmation message is returned to the subscriber transmission node 2 which has generated the message. If the service is not finalized,
Alternatively, if the setting of the service control right is bad, a reject message is returned to the corresponding transmission node.

When the transmission node receives the confirmation message, it cancels the service control right of the basic service. When the rejection message is received, the basic service is continued (at this time, whether the call is continued or disconnected depends on the network).

Next, the operation of returning the service control right to the transmission node shown in FIG. 3 will be described in the order of operation shown in FIG. The service A deployed in the service control network is executed in the service control node 5, and when the service is completed, the service A is deleted and a basic service restart message is transmitted to the transmission node.

When the transmission node receives the basic service restart message, it reproduces the basic service based on the information related to the message. The configuration and processing flow of each unit for realizing the operations in FIGS. 2 and 3 will be described below.

FIG. 4 is a block diagram showing a transmission control node including a subscriber transmission node and a relay transmission node.
FIG. 5 shows an operation sequence for transferring the call control right, and FIG. 6 shows an operation sequence for returning the call control right.

In FIG. 4, 2A is a transmission control node, 3A
Is a physical interface such as a common line network connecting the transmission control node and the service control node, 20 is a basic call control unit for executing a basic service for switching to a subscriber, and 21 is a communication by the basic call control unit 20. A resource control unit 22 for performing control, switch control, etc .; a service analysis unit 22 for analyzing the contents of a service request to the service control node when it occurs; 23, a control for transferring the call control right between the transmission control node and the service control node Is an IN control unit that performs In this embodiment, the service control network including the service control node 5 is realized by an intelligent network (abbreviated as IN), and the IN control unit 23 has a call control right with the IN. Control.

FIG. 5 shows an operation sequence of the call control right transfer executed by the configuration shown in FIG. FIG. 5 shows a mutual operation sequence of the respective units of the basic call control unit 20, the service analysis unit 22, and the IN control unit 23. The operation sequence shown in FIG.

The basic call control unit 20, which executes the call control process, sets an arbitrary trigger point (signal message reception, signal message reception,
When a trigger occurs due to an event (indicated by #A) due to reception of a specific information element, reception of an unrecognizable number, resource busy, timeout, etc., an analysis request is issued to the service analysis unit 22.

The service analysis unit 22 receives the received information and I
N condition data (subscriber correspondence data used to identify whether or not a subscriber has a condition to receive service by IN)
Are compared, and if the conditions are met, it is determined that the call is an IN call, and the IN control unit 23 is activated.

The IN control unit 23 executes the IN control process to perform a process for transferring a call, transmits a message of “call control right transfer” to the service control node 5 (FIG. 4), and returns a confirmation reply. Transition to the state of waiting for.

When receiving the "transfer confirmation" message in the confirmation waiting state, the IN control unit 23 notifies the basic call control unit 20 that has issued the call transfer request that the call transfer has been completed and, at the same time, transfers the call. Post-processing is performed, and a transition is made to a state of waiting for an instruction from the subsequent service control node.

When the basic call control unit 20 finds that the call transfer has been successful, the basic call control unit 20 deletes the process and enters an empty state. An operation sequence of call control right restoration after the call control right is transferred to the service control node by the operation of FIG. 5 will be described with reference to FIG.

Upon receiving the "call control right return" message from the service control node, the IN control unit 23 sends a return request to the basic call control unit 20 by adding the received information and the information managed by the IN control unit itself. . When return is made, I
The process of the N control unit itself ends and disappears.

Upon receiving the return request, the basic call control unit 20 stores the received information and transitions to the designated call state. Next, FIG. 7 is a block diagram of the service control node, FIG. 8 is an operation sequence of the call control right transfer of the service control node, and FIG. 9 is an operation sequence of the call control right restoration of the service control node.

In FIG. 7, 2A and 3 are the same as in FIG. 4. In the service control node 5, 50 is a service control unit for controlling a requested service, and 51 and 52 are provided in the service control unit 50, respectively. Call control unit and service analysis unit. Reference numeral 53 denotes a service scenario composed of a program of each service of service A... Service I, and reference numeral 54 denotes a resource control unit for performing communication control, resource control, and the like in the service control node 5.

The operation sequence of the call control right transfer executed by the configuration of the service control node shown in FIG. 7 will be described with reference to FIG. FIG. 8 shows a mutual operation sequence of the call control unit 51, the service analysis unit 52 in the service control unit 50 (FIG. 7), and each unit of the service scenario 53, and will be described below in the order of operation shown in FIG. I do.

The call control unit 51 of the service control unit 50
When the "call control right transfer" message (shown in FIG. 5) is received from the transmission control node when the IN call state is idle, pre-transition processing such as analysis of the received information is performed, and the service analyzer 52 is started.

The service analysis unit 52 analyzes and determines the service requested by the subscriber number, trigger point information, and the like sent from the transmission control node side, and returns it to the call control unit 51 (referred to as service A).

The call control unit 51 activates the scenario of the service A of the returned type, performs post-transfer processing of the call, transmits a "transfer confirmation" message to the transmission control node, and transmits the designated call. Transition to the state. In the service scenario 53, the process of the activated service A is executed.

With the operation shown in FIG.
The operation sequence of the call control right restoration executed after the completion of the third step will be described with reference to FIG. In the service scenario 53, the service process is performed in the service A state, and the logic of the service A is terminated. However, if the call control needs to be continued in the call control unit 51, the call control right restoration is activated and terminated. I do. Thereafter, the state of the service A becomes empty.

Upon receiving the call control right return message, the call control unit 51 of the service control unit 50 starts the return processing, transmits a "call control right return" message to the transmission control node, and terminates its own process. Disappear. Thereafter, the IN call state becomes empty.

[0038]

According to the present invention, the basic function of exchange and the service function are separated between the transmission layer and the service control layer, and the transfer of the call control right (service control right) is flexibly performed by the interface between the two layers. By doing so, the control range of the exchange service provided in the service control layer is minimized, so that efficient service development can be realized.

[Brief description of the drawings]

FIG. 1 is a principle configuration diagram of the present invention.

FIG. 2 is an operation explanatory diagram of a service control right transfer in the switching system of the present invention.

FIG. 3 is an explanatory diagram of an operation of returning a service control right to a transmission node in the switching system of the present invention.

FIG. 4 is a block diagram of a transmission control node.

FIG. 5 is an operation sequence of transfer of a call control right of a transmission control node.

FIG. 6 is an operation sequence of a call control right return of the transmission control node.

FIG. 7 is a block diagram of a service control node.

FIG. 8 is an operation sequence of a call control right transfer of the service control node.

FIG. 9 is an operation sequence of call control right restoration of the service control node.

[Explanation of symbols]

 Reference Signs List 1 transmission layer 2 subscriber transmission node 2 'relay transmission node 2 a service activation instructing means 2 b basic service resuming means 3 interface 4 service control layer 5 service control node 5 a service generating means 5 b basic service resuming instructing means

──────────────────────────────────────────────────続 き Continuing from the front page (73) Patent holder 000005108 Hitachi, Ltd. 4-6-6 Kanda Surugadai, Chiyoda-ku, Tokyo (72) Inventor Hiroyuki Josei 1015 Uedanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Fujitsu Limited (72) Inventor Takashi Suzuki 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Tomomi Omiya 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72 ) Inventor Yoshikazu Takahashi 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. (72) Inventor Eiichi Murayama 5-7-1 Shiba, Minato-ku, Tokyo NEC Co., Ltd. (72) Invention Person Isao Shinbo 216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture, Hitachi, Ltd.Information and Communication Division (56) References JP-A-4-2746 53 (JP, A) JP-A-4-180392 (JP, A) JP-A-4-351191 (JP, A) JP-A-4-336837 (JP, A) (58) Fields investigated (Int. ^7, DB name) H04M 3/00 H04M 3/16 - 3/20 H04M 3/38 - 3/58 H04M 7/00 - 7/16 H04Q 3/54 - 3/56

Claims (1)

(57) [Claims] 1. A transmission layer comprising a plurality of transmission control nodes including a subscriber transmission node and a relay node and having an exchange basic function, and a service control layer comprising a plurality of service control nodes and having a function of controlling a service. in a network that is separated, the transfer control nodes constituting the transmission hierarchy, the subscriber
Call control to perform basic services for switching
Communication control, switch control, etc.
A resource control unit for the service control node.
Service analysis unit for analyzing the request and the service control node
Intelligent transfer control of call control right to and from
A network control unit, wherein the basic call control unit transmits a service to the service control node.
The service analysis unit detects that the call requires a service.
Starts the intelligent network controller
And the intelligent network control unit
Service control node to transfer the call control right.
When the call control right is transferred, the basic call control unit
The process disappears in response to transition of rights, the service control node, from the transmission control node
Generates corresponding service by activation and transfer of call control right
When the service is completed, the service control node is started.
Restarts processing of the basic call control unit for the activated transmission control node
An interface method between a service control layer and a transmission control layer, characterized by sending an instruction .