KR100221019B1 - Method for calling path - Google Patents

Abstract

The present invention relates to a method for calling a designated path in a satellite communication system that allows a system operator to directly select a specific relay line and make a call by using an arbitrary telephone. A satellite communication system for providing a communication function to the subscriber by combining a plurality of base stations combined with a satellite; When a predetermined designated path test data for testing any relay line is received, a test data storing step of storing the test data in a predetermined memory, and searching whether the corresponding subscriber line is registered based on the stored test data. Subscriber line registration search step, if the subscriber line is registered, the test relay line occupancy step occupying the test relay line based on the test data, and if the test relay line is occupied, the subscriber outputs the corresponding subscriber number through the test relay line Characterized in that it comprises a number output step.

Description

Designated Calling Method in Satellite Communication System

The present invention relates to a communication system using satellites, and in particular, a designated path in a satellite communication system that enables a system operator to directly check whether a relay line is broken by allowing a user to select and call a specific relay line. It relates to a call method.

At present, satellite communication, which allows subscribers who are located at remote sites to make calls through satellites, is becoming increasingly common. Such satellite communication is mainly required for long distance communication between countries because it does not require a separate signal line for a call. It is usefully used as a communication method in a mountainous country like Korea.

In the satellite communication, a pre-assignment multiple access (PAMA) method of allocating communication channels for each subscriber before a predetermined time in accordance with the channel assignment method and a DAMA (Demand Assignment Multiple) for allocating communication channels according to a subscriber's request. Access) method, in general, the DAMA method for voice communication and the PAMA method for data communication are adopted in consideration of the cost and effectiveness of the communication channel.

1 is a system configuration diagram showing the overall configuration of a general satellite communication system according to the DAMA method.

In Fig. 1, reference numeral 1 is a satellite having a plurality of communication channels, 2 is a central control station for controlling the entire satellite communication system, and 3 (3A, 3B) is an exchanger (11A, 11B) or a telephone (12A, 12B). And interface functions for terminals such as data terminals 13A and 13B and facsimile 14A and 14B, such as a computer, and communication between the various terminals through data transmission and reception with the central control station 2. It provides a base station.

In FIG. 1, reference numeral S denotes a service channel for transmitting and receiving control data, and T denotes a traffic channel for transmitting and receiving data or voice.

In the above-described configuration, the central control station 2 transmits a control message through a service channel in a normal state and then, based on a response message sent from the base station 3, that is, communication It performs a polling function to check the available capacity or the utilization status of the communication channel. When there is a call request from a specific base station, for example, the base station 3A to the terminal of the base station 3B, it is determined whether the corresponding base station 3B is in a state in which communication is possible based on the information obtained in the polling process. In the case of the communicable state, the available traffic channel T of the satellite is allocated to both base stations 3A and 3B so that both base stations 3A and 3B can directly communicate with each other.

Subsequently, when the communication between the base stations 3A and 3B is terminated and the communication termination signal is applied through the service channel S from the base station 3A, which has been requested for communication, the central control station 2 is applied to both base stations. By executing the communication termination process, the traffic channel T which has been provided to both base stations 3A and 3B is released.

On the other hand, the base station 3 coupled with the subscriber sends a response message for the polling message to the central control station 2 when, for example, a polling message for the operation state of the base station 3 is received from the central control station 2. In addition, when there is a call request from the subscriber, a series of S-ALOHA packets including the call request message is generated and sent to the central control station 2. Subsequently, when a message such as a call permission message, an available SCPC channel unit 24, a communication channel, etc. is received from the central control station 2, the corresponding SCPC channel unit 24 and the communication channel are allocated to the caller directly to the subscriber. To provide communication.

When the base station 3 receives a call request from the subscriber to other subscribers in the country, the base station 3 avoids a series of message transmission / reception operations for the call request with the central control station 2 as described above, and sets the call itself. It provides the calling function of both subscribers. Further, when the call is terminated, the base station 3 transmits a call release message including the call start time, call end time, and communication type of the calling party to the central control station 2.

2 is a block diagram showing the configuration of the base station 3 described above.

In FIG. 2, reference numeral 21 denotes an antenna for transmitting and receiving satellite 1, an uplink signal, and a downlink signal, and 22 denotes an antenna 21 through the antenna 21 using polarization characteristics of frequency. Orthogonal Mode Transducer (OMT) for separating and inputting and receiving signals, and Low Noise Amplifier (LNA) for low noise Amplifier), a frequency down converter (DC) for converting a frequency signal applied through the low noise amplifier, for example, to an intermediate frequency signal (IF) of 70 MHz, from an IF combination / distributor 23 to be described later. An up-converter (UC) for converting an applied 70 MHz IF signal into a microwave of 14.0 to 14.5 GHz to generate an uplink frequency signal, and an uplink output from the frequency upconverter An RF processor configured to include: (High Power Amplifier HPA) high-power amplifier for amplifying the frequency signals.

In addition, reference numeral 23 separates and outputs the intermediate frequency signal applied from the RF processor 22 into a plurality of intermediate frequency signals, and is applied from the SCPC (Single Channel Per Carrier) channel unit 24 to be described later. IF is a combination divider (Combiner / Distributer) for outputting the combined intermediate frequency signal (24), the base station controller 50 to demodulate and decode the intermediate frequency signal applied from the IF combination divider 23 to be described later And an SCPC channel unit for encoding and modulating the signal output from the base station control unit 50 and outputting the same to the IF combination distribution unit 23.

Here, the IF combination distribution unit 23 is adopted for system scalability when using a plurality of SCPC channel units 24.

Further, reference numeral 30 denotes a base station controller for performing overall control of the base station 3, which is based on the subscriber's communication request based on, for example, an SCPC channel unit number or an available communication channel allocated from the central control station 2. A series of call control is performed. In addition, the base station controller 30 controls to transmit a predetermined response signal for the state information of the own station with respect to the periodic polling message from the central station 2.

Reference numeral 40 is a telephone data card which is directly coupled with a terrestrial network subscriber, for example, to accommodate 8 voice communication subscribers and 4 data communication subscribers simultaneously, and 50 is a public switched telephone network. It is a trunk interface port (Trunk Interface Port) that allows to connect the base station (3).

The reference code MPH [Main Pulse Modulation (MPH) Highway] is a data bus through which information data such as voice signals and data signals are transmitted and received, and the UPH (Utility PCM Highway) is control data between the base station controller 30 and each device. Is the control bus that is sent and received.

That is, in the base station 3 having the above-described configuration, when the polling message is periodically received from the central control station 2, the base station controller 30 transmits a predetermined response message to the central control station 2. . Then, when there is a call request from the subscriber, a predetermined call request message is output to the central control station 2, and then the SCPC channel unit 24 and the available communication channel allocated from the central control station 2 are output. It provides the calling function of both subscribers.

On the other hand, when a call is requested from any subscriber, the base station 3 transmits a call request message including a called party number to the central control station 2, where the central control station 2 transmits the call request message. Approximate destination path is established by using only the minimum digit for call setup received from the source. Then, the terminating base station 3 transmits and receives a complete call by directly transmitting and receiving the remaining called party number using subband signaling (Sus_Band Signaling). Will be set.

On the other hand, Figure 3 is a block diagram schematically showing the configuration of the above-described base station controller 30, reference numeral 31 in the drawing is a processor for controlling the entire system through the system bus (UPH, MPH), 32 is the processor ( 31) dual port RAM provided for data transmission and reception between the service channel controller 33, which will be described later, 33 extracts packet information from the message applied from the SCPC channel unit 24 to generate an S-ALOHA packet. In addition, the service channel controller generates and outputs a message of a time division multiplex (TDM) stream to the SCPC channel unit 24.

And, reference numeral 34 is a program storage unit for storing the operating program of the processor 31, 35 is a system state information storage unit for storing the status information of the overall device, 36 is the calling party information for the subscriber of the country, Subscriber information storage unit for storing subscriber information such as calling grade.

That is, in the base station controller 30 having the above-described configuration, the processor 31 periodically retrieves the state of the entire apparatus and stores the state information in the system state information storage unit 56. The central control station 2 In response to receiving the periodic polling signal transmitted from the C-channel, it generates and outputs a series of S-ALOHA messages from the service channel controller 33 based on the state information data of each device stored in the system state information storage unit 35. To control.

When the call request signal is generated from the subscriber, the processor 51 transmits the signal to the central control station 2, and if the communication channel and SCPC channel unit available from the central control station 2 are allocated, The calling party can control the call. In addition, when a communication channel and SCPC channel unit available from the central control station 2 are allocated together with the incoming request signal, the corresponding subscriber can control the call.

By the way, in the conventional satellite communication system having the above-described configuration, in order to search for and verify the corresponding relay line when a failure occurs in any of the relay lines, a separate circuit is installed in each relay line and a fixed fixed circuit for testing is used. There was an uncomfortable problem that should be used.

Accordingly, the present invention has been made in view of the above circumstances, and in a satellite communication system that enables a system operator to directly check whether a relay line is broken by allowing a user to select and call a specific relay line using an arbitrary telephone. Its purpose is to provide a method for calling designated paths.

1 is an overall system configuration for explaining the outline of a general satellite communication system.

FIG. 2 is a block diagram showing the configuration of the base station 3 in FIG.

3 is a block diagram showing the configuration of the base station controller 30 in FIG.

4 is a block diagram illustrating hardware designation of a designated path call method in a satellite communication system according to an embodiment of the present invention.

Figure 5 is a flow chart for explaining a designated path call method in a satellite communication system according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1: satellite 2: central control station

3A, 3B: Base station 11A, 11B: Switchboard

12A, 12B: Telephone 13A, 13B: Data Terminal

14A, 14B: Facsimile 21: Antenna

22: RF processing unit 23: IF combination distribution unit

24: SCPC channel unit (SCU) 30: base station control unit

40: Telephony Data Card (TDC) 50: Trunk Interface Port (TIP)

31,100: Processor 32: Dual Port RAM (DP RAM)

33: Service Channel Controller (SCC) 34: Program Storage

35: system status information storage unit 36: subscriber information storage unit

101: test information storage unit 102: code information storage unit

In the satellite communication system according to the present invention for achieving the above object, a designated path call method comprising: a satellite communication system providing a communication function to a subscriber by combining a plurality of base stations respectively coupled to a plurality of subscribers through a satellite; When a predetermined designated path test data for testing any relay line is received, a test data storing step of storing the test data in a predetermined memory, and searching whether the corresponding subscriber line is registered based on the stored test data. Subscriber line registration search step, if the subscriber line is registered, the test relay line occupancy step occupying the test relay line based on the test data, and if the test relay line is occupied, the subscriber outputs the corresponding subscriber number through the test relay line Characterized in that it comprises a number output step.

That is, according to the above, the system operator can easily check in software without any additional equipment to search for the failure of any relay line.

Next, an embodiment according to the present invention having the above configuration will be described.

4 is a block diagram illustrating hardware designation of a designated path call method in a satellite communication system according to an embodiment of the present invention.

In the drawing, reference numeral 100 denotes a processor for performing overall control of the base station 3, 101 denotes a test information storage unit for storing relay line test information input from a system operator, and 102 denotes a relay line test service provided by the system. Corresponding, for example, is a code information storage unit for storing code data of "11".

Reference numeral 40 denotes a telephone data card coupled with the terrestrial network subscriber, and 50 denotes a trunk interface for coupling with the public switched network.

Meanwhile, Table 1 below shows the format of the trunk line test information input from the system operator.

# One One X X X X X X X A A B B B *

Where '#' is the service start code, '11' is the trunk line test service code, 'XX ·· X' is the called party number, 'AA' is the trunk line control device number, 'BBB' is the trunk line number, and '*' 'Is the service exit sign.

That is, in the above configuration, when the relay line test data in the format of Table 1 is input through any telephone, the processor 100 first stores the test data in the test information storage unit 101. Done. Then, based on the test data, a random relay line can be selected, and then a series of call processing is controlled so that a call can be made with any subscriber through a designated path.

Next, a method for calling a designated path in a satellite communication system according to an embodiment of the present invention will be described with reference to the flowchart of FIG. 5.

First, when any of the terrestrial subscriber telephones (hereinafter referred to as a test telephone) coupled with the telephone data card 40 is inputted the predetermined trunk line test data in the format of Table 1 above (step ST501), the processor 100 stores the input relay line test data in the test information storage unit 101 (step ST502).

That is, when a relay line test service code (eg, “11”) is input after the service start code (#) is input from the test phone, the processor 100 recognizes that the service currently attempted is a relay line test. The data until the service end code (*) is input is stored in the test information storage unit 101.

Then, the processor 100 detects the called number from the stored test data to search whether the called number is a number normally registered in the base station 3 based on the subscriber information data of the subscriber information storage unit 36. (ST503).

As a result of the search in step ST503, if the called number does not become a registered number normally, it is controlled to send a predetermined error signal tone to the test telephone (step ST505).

On the other hand, when the search result of step ST503, the incoming number is normally registered number reads the relay line control device number and the relay line number from the test information storage unit 102 and transmits it to the trunk interface port 50, A predetermined occupancy request signal for occupying the relay line is transmitted (step ST506).

Subsequently, the processor 100 waits for a predetermined time to receive a predetermined relay line occupancy completion signal from the trunk interface port (step ST507 and ST508), and the occupation completion signal is received until a predetermined time elapses. If not, a predetermined error signal tone is transmitted to the test telephone in the same manner as in step ST505.

When the occupancy completion signal is received in step ST508, the processor 100 reads the public exchange subscriber information to be tested, for example, the called number stored in the test information storage unit 101, and the trunk interface port 50. The control unit performs control to perform a series of call processing for the telephone under test by outputting the control unit (ST509).

Thereafter, the system operator can determine the normality of the corresponding relay line by attempting a direct call with the subscriber when a call path is established with the subscriber under test. On the other hand, if the test subject is busy (busy) or a vision phenomenon occurs, the cause is analyzed to determine whether the corresponding path is normal.

Therefore, according to the above configuration, it is possible for the system operator to easily check in software without any additional equipment to search for the failure of any relay line.

In addition, this invention is not limited to the said Example, It can variously deform and implement within the range which does not deviate from the technical summary of this invention.

As described above, according to the present invention, it is possible to realize a designated path call method in a satellite communication system that enables a system operator to select a specific relay line and make a call by using an arbitrary telephone. It becomes possible.

Claims (1)

A satellite communication system for providing a communication function to a subscriber by combining a plurality of base stations each coupled to a plurality of subscribers via a satellite; A test data storing step of storing the test data in a predetermined memory when a predetermined designated path test data for testing an arbitrary relay line is received; Subscriber line registration search step for searching whether the corresponding subscriber line is registered based on the stored test data, If the subscriber line is registered, the test relay line occupancy step occupying the test relay line based on the test data, and If the test relay line is occupied, the designated path call method in the satellite communication system comprising a subscriber number output step of outputting the subscriber number through the test relay line.