JPH0522205A - Transmission system for subscriber line control signal - Google Patents

Abstract

PURPOSE:To attain efficient utilization of a satellite line by multiplexing a subscriber line control signal sent/received between a subscriber line terminator and a subscriber exchange onto a satellite line control signal of a line assigned continuously. CONSTITUTION:A line 7 for a satellite line control signal and a line 8 for a subscriber line control signal are always continuously assigned regardless of occurrence of a call. An identifier representing inclusion of a subscriber line control signal is added to a signal frame for the satellite line control signal and the subscriber line control signal in the signal frame is sent. A equipment 4 or a subscriber station equipment 3 is used very intermittently in most cases and repetitive information representing 'no use' is sent to the two lines 7, 8 for a period when the lines are not in use. Then the information transmission representing it that the line is not use for transmission is integrated for a period when the terminal equipment is not in use and the utilization efficiency is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a communication system in which a terminal and a subscriber line exchange are connected by a satellite line. The present invention relates to an improvement in a method of transmitting a subscriber line control signal for controlling a subscriber line terminating device to a satellite line in which demand assign control is performed.

[0002]

2. Description of the Related Art FIG. 3 is a connection configuration diagram of a conventional example system.
This system is a system in which a satellite line passing through a communication satellite 5 is used between a subscriber exchange 1 in a communication network and a terminal device 4 accommodated in this subscriber line exchange. A base station device 2 is connected to the subscriber line exchange 1, while a subscriber station device 3 is connected to the terminal device 4, and a satellite line is set up between the base station device 2 and the subscriber station device 3. Has been done. A line 6 for transmitting main information and a line 7 for a satellite line control signal for controlling the line 6 are set in this satellite line. Main information and / or call control signals are transmitted to the line 6 for transmitting main information, and the line 6 is subjected to demand assignment control according to the occurrence of a call. The line 7 for satellite line control signal is continuously assigned regardless of whether or not a call is generated in order to perform this demand assignment control.

Here, in the conventional transmission of the subscriber control signal,
In addition to the line 6 for transmitting the main information and the line 7 for satellite line control signals, it was necessary to separately provide a line 8 for subscriber line control signals.

[0004]

The line 8 for the subscriber line control signal needs to be continuously assigned regardless of whether or not a call is generated, which lowers the utilization efficiency of the satellite line. This is a cause of limiting the number of subscribers who can use satellite lines.

The present invention is intended to improve this and to improve the utilization efficiency of satellite lines.

[0006]

The present invention is characterized in that a subscriber line control signal is multiplexed and transmitted to a line (7) for satellite line control signals. The line (7) for the satellite line control signal is a line that is always continuously assigned regardless of whether or not a call is generated, and that the line control signal for the satellite line control signal contains the subscriber line control signal. And the subscriber line control signal is transmitted in the signal frame.

[0007]

The line (7) for the satellite line control signal and the line (8) for the subscriber line control signal are lines that are always continuously assigned regardless of whether or not a call is generated. 4) Or the use of the subscriber station equipment (3) is very intermittent in many cases, and repetitive information indicating that it is not used on these two lines (7 and 8) is transmitted during periods of non-use. Has been done. Therefore, by multiplexing the subscriber line control signal to the line (7) for the satellite line control signal, the information transmission indicating that the line transmitted during the period when the terminal device is not used is unified. Therefore, the utilization efficiency of the satellite line can be improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of the system of an embodiment of the present invention. A satellite line via a communication satellite 5 is used between a subscriber exchange 1 in a communication network and a terminal device 4 accommodated in the subscriber line exchange, and a base station device 2 is connected to the subscriber line exchange 1. On the other hand, the subscriber station device 3 is connected to the terminal device 4. In many forms, the subscriber station device 3 is installed in the subscriber's house. In this method, a satellite line is set up between the base station device 2 and the subscriber station device 3. Generally, a large number of subscriber station devices 3 are installed corresponding to one base station device 2. The base station device 2 includes a wireless transmission / reception unit 21, a transmission line termination unit 22, and a satellite line management control unit 23 that manages and controls these. The subscriber station device 3 includes a wireless transmission / reception unit 31, a transmission line termination unit 32, and a satellite line management control unit 33 that manages and controls these units.

A line 6 for transmitting main information and a line 7 for a satellite line control signal for controlling the line 6 are set in this satellite line. Line 6 for transmitting main information
The main information and / or the call control signal are transmitted to the line 6, and the line 6 is demand-assigned according to the occurrence of a call. The line 7 for satellite line control signals is
It is continuously assigned regardless of whether or not a call is generated to perform assignment control. That is, the demand assignment method, in which the line 6 for transmitting the main information to be provided to the user is connected according to the occurrence of a call, is applied to effectively use the satellite line. In order to set up a satellite line in response to the occurrence of this call, it is necessary to constantly exchange satellite line control signals between the satellite line management control units 23 and 33 of the base station device 2 and the subscriber station device 3. is there. A feature of the present invention is that the subscriber line control signal transmitted and received between the transmission line terminating unit 22 and the subscriber line terminating unit 32 is multiplexed and transmitted to the line 7 for satellite line control signal. Especially.

FIG. 2 is a frame structure diagram of a satellite line control signal for this purpose. This is an example of the case where HDLC is adopted as the transmission control system of the satellite line control signal, and the control signal identifier for identifying the original satellite line control signal and the subscriber line control signal is provided in the first byte of the information frame. By adding, the contents of the following control signals are configured to be distinguished. The addition of this identifier and the identification control of the identifier of the received signal are performed by the satellite line connection control units 23 and 3
It is realized by the program control of 3.

[0011]

As described above, according to the present invention,
Since one control line is assigned continuously and continuously and a plurality of control signals are multiplexed and transmitted, the utilization efficiency of the line can be improved. The terminal device or the subscriber station device is used very intermittently, and the ratio of the unused time is often very small. Therefore, by reducing the number of control lines that are continuously assigned, it is possible to unify the signals that indicate that the repeatedly transmitted lines are not used for most of the unused time. You can By improving the line utilization efficiency, the number of subscribers that can be accommodated in one satellite line can be increased.

[Brief description of drawings]

FIG. 1 is a line configuration diagram of a system according to an embodiment of the present invention.

FIG. 2 is a frame configuration diagram of a satellite line control signal according to the embodiment of the present invention.

FIG. 3 is a line configuration diagram of a conventional example system.

[Explanation of symbols]

 1 subscriber line switch 2 base station device 3 subscriber station device 4 terminal device 5 communication satellite 6 line for transmitting main information 7 line for satellite line control signal 8 line for subscriber line control signal

Claims (1)

Claims: What is claimed is: 1. A satellite line is used in a subscriber line section connecting between a terminal device and a subscriber line exchange, and a demand is assigned to this satellite line in response to a call. In the transmission method of the subscriber line control signal including the line for transmitting the main information and the line for the satellite line control signal which is continuously assigned for the demand assignment control of the line for transmitting the main information. A subscriber line control signal transmitted / received between a subscriber line terminating device to which the terminal device is connected and the subscriber exchange is multiplexed on a line for the satellite line control signal. Transmission method of control line control signal.