JPS611148A - Semi-fixed call setting system in packet exchange network - Google Patents

Abstract

PURPOSE:To acquire an efficient communication line in a packet exchange network by connecting a call connection request from a terminal equipment to an optional terminal equipment via a termination station of a fixed connection communication line and substituting the selective connection even at a fault of the fixed connection communication line. CONSTITUTION:Packet exchange stations A,B-D are connected mutually via relay lines R1,R2-R4 respectively, a terminal equipment T1 is connected to the station A, a terminal equipment T2 is connected to the station C and a terminal equipment T3 is connected to the station D. Then patterns 1-4 are set by using respectively a fixed connection request signal from the terminal T1 in the fixed connection communication line between the terminal equipment T1 and the stations A-D. When the fixed connection request signal is transmitted from the terminal equipment T1 in the pattern 2, for example, the stations A, B receive it and the communication line with the terminal equipment T1 is set. Then the data transmitted from the terminal equipment T1 is transmitted to the station B and connected selectively to the opposite terminal equipment T2 according to the address information set in the data. If a fault takes place in the relay line R2 between the stations B and C, the station B is connected selectively to the opposite terminal equipment T2 via the relay lines R3 and R4.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a semi-permanent call setup method in a packet-switched network.

(Prior art) Conventionally, fixed connection services in packet switching networks are services only between two terminals accommodated in the packet switching network, and communication permission for fixed connection services depends on the maintenance of the packet switching center that accommodates the terminals. This was done through registration processing from the operational typewriter.

Therefore, only limited communication is possible between two terminals,
In order to secure the communication path between two terminals, the communication path within the network is putting pressure on other selective connection service calls, and even when changing the communication partner, the change processing from the maintenance operation typewriter at the packet switching center is performed. Furthermore, if a failure occurs in the fixed connection communication path, there is a drawback that communication becomes impossible unless changes are made by the maintenance/operation typewriter.

(Objective of the Invention) The object of the present invention is to solve the above-mentioned drawbacks inherent in conventional fixed connection services, to eliminate the troublesome registration process by maintenance typewriters at packet switching centers, and to enable arbitrary registration according to the content of requests from terminals. An object of the present invention is to provide a semi-permanent call setting method in a packet-switched network, which enables connection processing with terminals in the packet switching network, and which can secure a communication path even if a fixed connection communication path failure occurs by replacing it with a selective connection.

(Structure of the Invention) According to the present invention, in a packet switching network that provides a fixed connection service, means for transmitting and receiving a fixed connection request signal is provided between a packet switching center and a terminal accommodated therein, and the fixed connection request signal from the terminal is provided. According to the request, the terminal and its accommodating station, the terminal and a relay station in the network.

A fixed connection communication path is set up between the terminal and a station that is not accommodated by the other end, or between the terminal and the other end terminal, and in response to a call connection request from the terminal, the terminal station of the fixed connection communication path connects to the other end. A semi-permanent call setting system in a packet switching network is obtained, which is characterized in that a communication path is set up for the fixed connection communication path, and when the fixed connection communication path fails, the communication path is set up by selective connection.

(Example) Next, an example of the present invention will be described with reference to the drawings. FIG. 1 (al is a conceptual diagram showing a semi-fixed call setup method in the packet switching network of the present invention. In FIG. 1 fal, packet switching stations (A, B, C, D)
2, R3, R4), the terminal (T1) is connected to the 2nd station Ω, the terminal (T2) is connected to the station 0, and the terminal (T3) is connected to the station 0, making it a fixed connection. The communication channel is the first
■, ■, ■, ■ shown in figure (b).

Either one of the patterns ■ and ■ can be set. In FIG. 1 (bl), solid lines indicate fixed connection communication channels, and dotted lines indicate selective connection communication channels.

In patterns (1) and (2), a fixed connection communication path between terminals is set by a fixed connection request signal from the terminal (T1), and the data transfer method is the same as the conventional method.

Patterns ■, ■, ■, and ■ indicate that a fixed connection communication path between the terminal (T1) and the packet exchange circuit, @, and (0, 0) can be set by a fixed connection request signal from the terminal (T1), respectively. There is.

The control of this method will now be explained for the case of pattern (2).

When a fixed connection request signal (request type: T1-station B connection) is sent from the terminal (T1) accommodated in the packet switching station (4), the packet switching station (6) receives this,
Set up a fixed connection communication path with the terminal (T1). Once set, a fixed connection channel is secured unless a cancellation instruction is issued from the terminal.

Next, the data sent from the terminal (T1) is directly transferred to the station (2), and the station (6) performs a selective connection process to the other terminal (T2) according to the destination information set in the data.

FIG. 2 shows a conceptual diagram of selective connection. In FIG. 2(a), when selective connection is made, if the probability of completion of setting to the connected terminal is high, and if the service is not satisfactory, a fixed connection channel may be set directly to the connected terminal. Once the selective connection is completed, subsequent data from the terminal (T1) will be sent to the other terminal, c
T2). In FIG. 2, CR and CN are selective connection request buckets) and CA.

CC indicates a selective connection possible packet.

Next, in FIG. 2(b), a case will be described in which an incoming call request is made to the fixed connection channel. When the terminal (T2) makes a selective connection request to the fixed connection channel, the station (6) sets up the fixed connection channel and the communication channel for the incoming request call, and establishes the communication channel between the terminal (T2) and the terminal (T1). can be set.

Next, a relay path (R2) connecting between station (6) and station (O)
If a failure occurs in the relay route (R3, R4) from the station (6) to the relay route (R3, R4) based on the data containing destination information that has reached the station (6).
Selective connection processing is performed with the other terminal (T2) via the terminal.

Similarly, in the case of pattern (2) in FIG. 1(b), a selective connection request is made from station (2).

(Effects of the Invention) As explained above, the present invention eliminates the troublesome registration process by the maintenance typewriter at the packet switching center, and enables connection processing with any terminal according to the request from the terminal. This has the effect of securing an alternative communication path to a selective connection even in the event of a fixed connection communication path failure.

[Brief explanation of the drawing]

FIG. 1 (al(b) is a conceptual diagram showing a packet switching network according to the present invention and its fixed connection communication path, and a diagram showing its connection pattern, and FIG. 2 (aXbl is a selective connection starting from the fixed connection communication path) This is a conceptual diagram of Tl, T2.T3...
・Terminal, A, B, C, D...Packet switching center,
R1゜R2, R3, R4 --- Relay route, ■, ■,
■、■、■、■・・・Fixed connection channel pattern,
OR, CN... Selected connection request packet, CA,
CC・・・・・Selectable connectable packet 0

Claims (1)

[Claims] In packet switching networks that provide fixed connection services,
A means for transmitting and receiving a fixed connection request signal is provided between a packet switching center and a terminal accommodated therein, and in accordance with a fixed connection request from the terminal, the terminal and its accommodation station, the terminal and a relay station in the network, and the terminal A fixed connection channel is set up between the terminal and the other terminal, and in response to a call connection request from the terminal, the terminal station of the fixed connection channel connects the terminal to the other terminal. A semi-fixed call setting method in a packet switching network, characterized in that a communication path is set up, and when the fixed connection communication path fails, the communication path is set up by selective connection.