JPH03213043A - Signal system - Google Patents

Abstract

PURPOSE:To attain communication at a high speed transmission line by separating a transaction function (TC) processing realizing line noncorrespondence control in service adaptor control between a computer and an exchange or the like from a common line signal network and executing the processing in a packet network. CONSTITUTION:Each of 1st-3rd layers specifies each of levels 1-3 of a message transfer section similarly to a conventional system, and the 3rd layer includes a signal connection control section. A transaction function (TC) of an application layer of a 7th layer is included in a packet network. The CCITT recommendations G.703 is applied to a physical layer of the 1st layer in the packet network and each of levels 2, 3 of the CCITT recommendations X.25 is applied to each of the 2nd and 3rd layers respectively and no revision from a conventional system is caused. The CCITT recommendations G.703 is adopted for the 1st layer of the packet network to allow the transaction function (TC) to be sent on the packet network at a transmission speed of 1.544Mbps.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is an intelligent integrated communications network or integrated services digital network (ISDN) that provides advanced services to customers by combining computers and switching equipment. , relates to layer 7 (application layer) signaling according to the Open Systems Interconnection (O3I) basic reference model, which is used to control services between computers and exchanges, etc.

[Conventional technology]

Conventionally, this type of signal was transmitted via CC as an interface between stations.
ITT standard No. 7 common line signaling is applied.

The inter-office common line signaling system will be explained with reference to FIG.

FIG. 4 is a system diagram showing a conventional example. As the interface between offices, the CCITT standard No. 7 common channel signaling system is applied as a standard signaling system between exchanges and between an exchange and an in-network database (held by an exchange or a computer). The signal configuration of this signaling system is l5
In order to flexibly deal with various services of DN, it has a user section and a signal transfer function section. (For example, Electronic Information and Communication Handbook 1988 edition published by Ohmsha PP2092~
(Refer to 2093) The user part consists of an ISDN user part and a transaction function (TC), and the signal transfer function part consists of a signal connection control part (SCCP) and a message transfer part (MTP).

On the other hand, the Open System Interconnection (O3I) basic reference model forms seven layers as a standard of ISO and CCITT, with the first to third layers for transmission functions and the fourth to seventh layers for communication. Each function is specified separately. As shown in Figure 4, the transmission function of the inter-office common line signaling system consists of a message transfer unit (MTP level 1) from the first layer to the third layer.
to level 3, or further to the third layer, there is a signal connection control section <5C
CP) are also included. The transaction function (TC) of the user section is included in the application layer of the seventh layer among the communication functions.

[Problem to be solved by the invention]

The conventional signaling method described above is based on the transaction function (T
Since C) is configured to exist on the common line signal network using the No. 7 common line signaling method, the communication transmission speed of the transaction function (TC) depends on the physical transmission speed of the common line signal network. However, even if a packet network was available, this communication function could not be applied and the speed could not be increased.

SUMMARY OF THE INVENTION An object of the present invention is to provide a signaling system that solves the above problems by processing the transaction function (TC) of a common signal network using a packet network.

[Means to solve the problem]

The basic means of the signaling system according to the invention is the Intelligent Integrated Network or Integrated Services Digital Network (I5DN), which provides advanced services to customers by combining computers and exchanges. In the signaling system used for control of services, etc., the transaction function (TC), which realizes circuit-independent control that sends and receives signals independently of the communication path, is implemented on a packet network separate from the common channel signal network. It's about processing.

Further, one embodiment of the basic means is CCITT standard No. applied to common line signaling networks.

The class 2 logical connection number of the signaling connection controller (SCCP) of the 7 signaling system is set to the level 3 of the CCITT Recommendation
The purpose is to process it in association with the logical channel number above.

〔Example〕

Next, the signaling system of the present invention will be explained with reference to the drawings.

FIG. 1 is a basic configuration diagram based on an O3I basic reference model showing an embodiment of the present invention. The first to seventh layers in FIG. 1 have already been described with reference to FIG. 4. 1st
In the figure, in the common line signal network, the first to third layers are
As before, each layer up to the MT layer has a message transfer section (MT
Each of levels 1 to 3 of P) is defined,
The third layer also includes a signal connection control unit (SCCP). In the present invention, as shown in FIG. 1, the transaction function (TC) of the application layer of the seventh layer is included in the packet network. The first physical layer in a packet network is CCITT Recommendation G,
703, and each of the second and third layers are CCI
Level 2 and Level 3 of TT Recommendation By adopting CCITT Recommendation G, 703 for the first layer of the packet network, the transaction function (TC) is 1.544 Mb.
It becomes possible to transmit data on a packet network with a transmission speed of PS.

Next, FIG. 2 is a comparison diagram showing an example of a 5ccp message in a common line signaling network and an X, 25 level 3 message in a packet network. As shown in Figure 2, 5
The CCP message includes at least the destination point code,
Originating point code.

Contains signaling link selection, message type, logical connection number and user data. A packet network X,25 level 3 message includes at least a general format identifier (GF I ), a logical channel number, a packet identifier, and user data. Message conversion becomes concretely possible by associating the logical connection number of the 5ccp message with the logical channel number of the X, 25 level 3 message.

Next, an example of communication between the exchange and the computer will be described with reference to FIG.

First, the exchange sets up a 5CCP class 2 logical connection of the No. 7 common line signaling system by transmitting a call receiving (CR) signal. The computer responds to the reception of the incoming call signal by returning a connection completion (CC) signal and causes the exchange to confirm the settings. This logical connection setting can of course be done from a computer.

Next, a logical channel number equivalent to the logical connection number assigned on the common signal network is set as a logical link on the packet network. In other words, on the packet network, the switch uses high-level data link control procedures (HDLC).
processes the prescribed procedure of sending the command SABM and then returning the response UA from the computer,
Establish logical link configuration. Through this logical link,
Transaction function (
TC) It becomes possible to exchange data by sending data and receiving confirmation messages. Note that the termination process of the transaction function involves releasing the logical connection on the common signal network, and as a normal procedure, a recovery request (RLSD) is sent from the exchange.
The computer also sends a recovery completion (RLC) signal as a response signal to the computer. The exchange then issues the command DI of the high-level data link control procedure.
The logical link on the packet network is opened by the SC and response UA. Releasing these logical connections and links allows the next connection and link to be assigned.

〔Effect of the invention〕

As explained above, the signaling system of the present invention performs transaction function (TC) processing that realizes line-independent control such as service-compatible control between a computer and an exchange.
By separating from the common line signal network and executing it on a packet network, there is an effect that transaction function processing does not depend on the physical transmission speed of the common line signal network and communication can be performed over a high-speed transmission line.

[Brief explanation of drawings]

Fig. 1 is a basic configuration diagram showing an embodiment of the signaling system of the present invention, Fig. 2 is a comparison diagram showing an example of messages for each of the two networks, and Fig. 3 is an example of communication between an exchange and a computer. FIG. 4 is a block diagram showing a conventional example.

Claims (1)

[Claims] 1. Service support between computers and exchanges in an intelligent integrated communication network or integrated services digital network (ISDN) that provides advanced services to customers by combining computers and exchanges. In the signaling system used for control, etc., the transaction function (TC) that realizes circuit-incompatible control that sends and receives signals independently of the communication path is processed by a packet network separate from the common channel signal network. A signaling system characterized by 2. CCIT applied to the common line signaling network according to claim 1
T standard No. 7-signal system signal connection control unit (SCCP)
The class 2 logical connection number of CCITT Recommendation X. applied to the packet network according to claim 1. 2. The signal system according to claim 1, wherein processing is performed in association with a logical channel number on level 3 of the X.25 signal system.