KR19980016554A - Voice Call Monitoring Method and Device in Satellite Communication System - Google Patents

Abstract

According to the present invention, when a voice call communication is periodically monitored to detect an abnormal state of a call path, the present invention releases the corresponding call and immediately informs both subscribers of the abnormal state of the call path. The present invention relates to a voice call monitoring method and a device in a satellite communication system that can prevent a satellite communication system. In; The base station includes first and second timer means for performing a predetermined counting operation, acknowledgment message storing means for storing acknowledgment message data for monitoring a voice call in communication, and a predetermined time elapses after the voice call is set. And the control means for reading out the confirmation message data and sending it to the power station, and releasing the voice call if a response message is not received from the power station before a predetermined time.

In addition, the control means is characterized in that if the response message is not received before the predetermined time after sending the confirmation message again sending out the confirmation message, and repeats this confirmation message sending operation a predetermined number of times.

Description

Voice Call Monitoring Method and Device in Satellite Communication System

The present invention relates to a communication system using satellites, and in particular, when the voice call communication is periodically monitored to detect an abnormal condition of the call path, the call is released to both subscribers. The present invention relates to a voice call monitoring method and apparatus in a satellite communication system that can immediately notify a user of an abnormal state and prevent a disadvantage of a subscriber.

Recently, with the rapid development of communication technology, satellite communication, which enables subscribers who are located at remote sites to make calls through satellites, is becoming increasingly common. Such satellite communication is mainly used as a long distance communication between countries, or a communication method in a mountainous country such as Korea, because a separate signal line is not required for a call.

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. There are two types of Access) methods. In general, the DAMA method is used for real-time voice communication and the PAMA method is used for data communication in consideration of the cost and effectiveness of the communication channel.

1 is a block diagram showing the overall system 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.

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) 23 for separating and transmitting and receiving signals to be transmitted and received, 23 is a low noise amplifier for low-noise amplification, for example, 12.25 ~ 12.75G 75 downlink frequency signal inputted through the orthogonal mode converter 22 (LNA: Low Noise Amplifier), 24 is a frequency down converter (DC) for converting a frequency signal applied through the low noise amplifier 23 into an intermediate frequency signal IF of 70 MHz, for example.

In addition, reference numeral 25 separates and outputs the intermediate frequency signal IF applied from the frequency down converter 24 into a plurality of intermediate frequency signals, and also describes a Single Channel Per Carrier (SCP) channel unit to be described later. IF C / D: IF Combiner / Distributer (IF C / D) for combining and outputting the intermediate frequency signal applied from the SCU: 26, and 26 is an intermediate frequency applied from this intermediate frequency combiner / distributer 25. It is a SCPC channel unit that demodulates, decodes and outputs a frequency signal, and encodes, modulates, and outputs a message output from the base station controller 40 to be described later.

Here, the intermediate frequency combination / distributor 25 is employed for system scalability when using a plurality of SCPC channel units.

In addition, reference numeral 27 denotes a frequency up-converter for converting an IF signal of 70 MHz applied from the IF combination / distributor 25 into an microwave of 14.0 to 14.5 GHz to generate an uplink frequency signal. And 28 are high power amplifiers (HPAs) for amplifying uplink frequency signals output from the frequency up-converter 27.

Reference numeral 40 denotes a subscriber's communication request based on a message inputted from the central control station 2 through the SCPC channel unit 26, for example, an SCPC channel unit 26 number or an available communication channel number. By performing a series of controls on the communication, the communication can be executed. In addition, the status information of the local station is transmitted to the polling message transmitted from the central control station 2.

3 is a block diagram schematically showing the configuration of the base station controller 40 described above.

In the figure, reference numeral 41 denotes a processor for controlling the base station system based on a control signal input from the central control station 2, and the processor 41 receives status information of its own station when a polling signal is received from the central control station 2. Control the transmission, and when there is a call request from the subscriber (Calling) generates a series of S-ALOHA packets and transmits it to the central control station (2) to control the subscriber to communicate.

Further, reference numeral 42 is a service for extracting packet information from the message applied by the SCPC channel unit 26 and generating and outputting an S-ALOHA packet message for the SCPC channel unit 26. A service channel controller (SCC) and reference numeral 43 is a dual port RAM, which is provided for data transmission and reception between the processor 41 and the service channel controller 42.

Reference numeral 44 is a program storage unit for storing the operation program of the processor 44, 45 is a modem information storage unit for storing the SCPC channel unit number assigned from the central control station 2, 46 is a central control A channel information storage unit for storing communication channel data allowed by satellites allocated from the station (2).

Next, the operation of the base station 3 having the above-described configuration will be described.

A plurality of base stations 3 combined with general subscribers perform a series of operations based on the control messages of the central control station 2.

When the base station receives a polling message from the central control station 2, the base station transmits a response message for the polling message to the central control station 2. The response message will include the status information of the subscriber, such as billing information of the subscriber using the communication channel, and information on the SCPC channel unit currently in use.

In addition, when there is a call request from the subscriber, a series of S-ALOHA packets including a call request message is generated and transmitted to the central control station 2 through the assigned SCPC channel unit 26.

Subsequently, when a message such as a call permission message, an available SCPC channel unit, and a communication channel is received from the central control station 2, direct communication between subscribers is performed using the corresponding SCPC channel unit and communication channel.

However, after the call is set up by the subscriber, the voice call is continuously maintained until the subscriber of the home country or another station releases the call by on-hooking the handset. An abnormal condition occurs due to various factors such as an error of the communication modem (SCU), which means that even if the subscriber who is currently performing communication does not properly recognize the voice coming from the power station, the set call is maintained as it is. This is disadvantageous to the user such as a fee charged to the user.

Therefore, the present invention was created in view of the above problems, and when the voice call communication is periodically monitored to detect an abnormal state of the call path, the call is released to both subscribers and the call at the same time. It is an object of the present invention to provide a voice call monitoring method and a device in a satellite communication system that can prevent a disadvantage of subscribers by immediately notifying the abnormal state of the furnace.

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 40 in FIG.

Figure 4 is a block diagram showing the configuration of a voice call monitoring apparatus in a satellite communication system according to an embodiment of the present invention.

FIG. 5 is an operational flowchart for explaining the operation of the apparatus of FIG. 4. FIG.

* Brief description of the main parts of the drawing

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: orthogonal mode converter 23: low noise amplifier

24: frequency down converter 25: intermediate frequency combination / distribution unit

26: SCPC channel unit 27: frequency up converter

28: high power amplifier 40: base station control unit

41: processor 42: service channel controller

43: dual port RAM44: program storage unit

45: modem information storage unit 46: channel information storage unit

60: processor 61: counter

62, 63: timer 64: confirmation message storage

In the satellite communication system according to the first aspect of the present invention for realizing the above object, the voice call monitoring method includes a satellite communication system including a plurality of base stations coupled to a plurality of subscribers and a central control station for operating and controlling the plurality of base stations. To; Call setup step in which a voice call is set according to the call request of the subscriber, and a confirmation message sending step of sending a confirmation message to the country when a predetermined time has elapsed after the voice call is set, sending a confirmation message to the country and then confirming A response message receiving step waiting for reception of a response message for a message, and if a response message is not received for a predetermined time in the response message receiving step, releases a call and sends a call cancellation message including billing information to the central control station. Characterized in that configured to include a call release message.

In addition, in the satellite communication system according to the second aspect of the present invention, a voice call monitoring apparatus includes: a satellite communication system including a plurality of base stations coupled to a plurality of subscribers and a central control station for operating control of the plurality of base stations; The base station includes first and second timer means for performing a predetermined counting operation, acknowledgment message storing means for storing acknowledgment message data for monitoring a voice call in communication, and a predetermined time elapses after the voice call is set. And the control means for reading out the confirmation message data and sending it to the power station, and releasing the voice call if a response message is not received from the power station before a predetermined time.

In addition, the control means is characterized in that if the response message is not received before the predetermined time after sending the confirmation message again sending out the confirmation message, and repeats this confirmation message sending operation a predetermined number of times.

According to the above configuration, when an abnormal state occurs in the voice call, it is possible to immediately prevent the disadvantage of the user by releasing the corresponding call to minimize the charge.

Next, an embodiment according to the present invention will be described with reference to the accompanying drawings.

Figure 4 is a block diagram showing the configuration of the voice call monitoring apparatus of the satellite communication system according to an embodiment of the present invention, the same reference numerals are attached to the part performing the same function as Figure 3 in the drawings and a detailed description thereof will be omitted. .

In the drawing, reference numeral 61 denotes a counter for performing a predetermined counting operation, reference numerals 62 and 63 denote a predetermined time, and when a predetermined value is reached, the first and second timers 64 for outputting the resulting signal, and 64 The processor 60, which will be described below, is a confirmation message storage unit for storing confirmation message data transmitted from a calling station to a receiving station in order to check a current communication line.

In addition, reference numeral 60 denotes an SCPC channel unit by reading confirmation message data from the confirmation message storage unit 63 whenever a result signal counting a predetermined value from the first timer 62 when a voice call path is formed. It is a processor for transmitting to a large power through 26.

Next, the operation of the apparatus having the above-described configuration will be described with reference to the operation flowchart of FIG. 5.

First, when there is a call request from the subscriber, the base station 3 generates a series of S-ALOHA packets and sends them to the central control station 2. The central control station 2 communicates with the communication channel and the SCPC channel unit. Search for and allocate available communication channels and SCUs to the calling and called stations. The base station then keeps the assigned communication channel and SCU available so that subscribers can then communicate with each other.

Subsequently, when the call path is formed as described above (step ST1), the processor 60 counts the time by driving control of the first timer 62 (step ST2). When the first timer 62 counts a predetermined value, the first timer 62 outputs a resultant signal of a predetermined level. The processor 60 receives a resultant signal of a predetermined level from the first timer 62 (step ST3). ), The confirmation message is read from the confirmation message storage unit 64, and the confirmation message is sent to the power through the SCPC channel unit 26 (ST4 step).

In addition, the processor 60 increases the count value of the counter 61 by '1' (step ST5).

On the other hand, after sending the confirmation message to the power station, the processor 60 counts a predetermined time by driving control of the second timer 63 and continuously searches whether the response message for the confirmation message is received from the power station. If a response signal is received from the power before the second timer 63 counts the predetermined time (ST6 step), the counter data of the counter 61 is cleared and the process proceeds to the ST2 step as follows. (Step ST7).

Subsequently, if the response message is not received from the power until the second timer 63 counts the predetermined time in step ST6 (step ST8), the processor 60 may determine the value and the number currently counted by the current counter 61. Comparing the set value (step ST9), if the current counted value exceeds the set value, the call is sent to the subscriber and the country of the home country (step ST10).

In other words, when the confirmation message sent to the power exceeds a predetermined number of times, the call is regarded as an abnormal state of the voice call and released.

In addition, the processor 60 transmits a call tone and a call cancellation message including charging information such as a start time and an end time of the call to the central control station 2 (step ST11).

On the other hand, if the count value currently counted in step ST9 does not exceed a predetermined value, the process proceeds to step ST2 at all times and performs the following operations.

That is, according to the embodiment, it is possible to minimize the disadvantages of the subscribers by monitoring the call path by transmitting and receiving the confirmation / response message through the voice call in communication, if the response message is not received.

On the other hand, the present invention is not limited to the above embodiments and can be implemented in various modifications without departing from the technical rights of the present invention.

As described above, according to the present invention, when the voice call communication is periodically monitored and detects an abnormal condition of the call path, the call is released and the subscribers are immediately informed of the abnormal state of the call to both subscribers. It is possible to realize the voice call monitoring method and apparatus in the satellite communication system that can prevent the disadvantages of subscribers by telling.

Claims (6)

A satellite communication system having a plurality of base stations coupled to a plurality of subscribers and a central control station for operating and controlling the plurality of base stations, respectively; A call setup step of establishing a voice call according to a subscriber's call request; Confirmation message sending step of sending a confirmation message to the country after the voice call is set, A response message receiving step of waiting for reception of a response message for a confirmation message sent to a power station; If the response message is not received for a predetermined time in the response message receiving step, the call is released and the call message release step for sending a call cancellation message including billing information to the central control station, characterized in that the satellite communication comprising a How to monitor voice call in system. The method of claim 1, If the response message is not received for a predetermined time in the response message receiving step, the voice message monitoring method in the satellite communication system, characterized in that the transfer to the confirmation message sending step and repeats the following operations for a predetermined number of times. The method of claim 1, If the response message is received within a certain time in the response message receiving step, the voice message monitoring method in the satellite communication system, characterized in that the transfer to the confirmation message sending step and repeats the subsequent operation. A satellite communication system having a plurality of base stations coupled to a plurality of subscribers and a central control station for operating and controlling the plurality of base stations, respectively; The base station includes first and second timer means for performing a predetermined counting operation; Confirmation message storage means for storing confirmation message data for monitoring the voice call in communication, and If a predetermined time elapses after the voice call is set, the confirmation message data is read and sent to the power, and if the response message is not received from the power before the predetermined time, the control means for releasing the voice call. Voice call monitoring device in a satellite communication system. The method of claim 4, wherein The control means sends out the confirmation message again if the response message is not received from the power station after the confirmation message is sent out before the predetermined time, and repeats the confirmation message sending operation a predetermined number of times. Surveillance device. The method of claim 4, wherein And the control means repeats the operation of transmitting the confirmation message again when the response message is received before the predetermined time after sending the confirmation message.