KR19980052723A - Method of Accepting Choice Call in Satellite Communication System - Google Patents

Abstract

The present invention relates to a method for accepting a selected call in a satellite communication system that can accept only a call originating from a subscriber who wants to make a call. A satellite communication system for providing; The base station determines whether or not the subscriber is registered in the selective call acceptance service when the incoming request message is received, and when the subscriber is a subscriber registered in the selective call acceptance service, a predetermined call subscriber is sent to the calling station. Caller ID information requesting step for transmitting request information transmission request signal, Caller ID information searching step for determining whether caller ID information matches any selected call information when receiving caller ID information from sender station, and caller ID information If any of the selected call information is matched, characterized in that it comprises a call processing step of performing a normal call processing.

Description

Method of Accepting Choice Call in Satellite Communication System

The present invention relates to a communication system using satellites, and more particularly, to a method of receiving a selective call in a satellite communication system that can accept only a call originating from a subscriber who wants to make a call.

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 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.

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 operation program of the processor 31, 35 is a system state information storage unit for storing the status information of the overall device, 36 is a telephone number for the subscriber of the country, origination Subscriber information storage unit for storing subscriber information such as class.

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.

According to the above, when an originating subscriber calls a called subscriber (two subscribers of the same base station jurisdiction or a different base station jurisdiction), the called base station jurisdiction of the originating callee when the called subscriber is available to call ( 3) as described above, the control is established so that both subscribers can communicate. This does not reflect the will of the called party and establishes the call path unconditionally regardless of who the calling party is.

However, the incoming subscriber cannot know who the calling subscriber is even when the ring signal is output even when he / she does not want to answer the call request from most other subscribers except the specific outgoing subscriber. There is a problem. In other words, there is a need for a device that can selectively accept incoming calls for the called party.

Accordingly, the present invention was created in view of the above circumstances, and by storing subscriber information to selectively receive an incoming call at a base station combined with a subscriber and selection call information selected by the subscriber in a predetermined database, It is an object of the present invention to provide a method for receiving a selective call in a satellite communication system that can selectively receive an incoming call based on the subscriber information and the selective call information of the database when an incoming call is received.

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.

Figure 4 is a block diagram for explaining the hardware selection method in the satellite communication system according to an embodiment of the present invention.

5 is a flowchart illustrating a process in which a subscriber registers a selection call in a method for receiving a selection call in a satellite communication system according to an embodiment of the present invention.

6 is a flowchart illustrating a method for receiving a selected call in a satellite communication system according to an embodiment of the present invention.

* 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: RF processing unit 23: IF combination distribution unit

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

40: telephone 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 unit

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

101: service subscriber information storage unit 102: selection call information storage unit

103: special code information storage unit

In the satellite communication system according to the present invention for achieving the above object is a method for receiving a selection call in a satellite communication system for providing a communication function to the subscriber by combining a plurality of base stations respectively coupled to a plurality of subscribers via satellite; The base station determines whether or not the subscriber is registered in the selective call acceptance service when the incoming request message is received, and when the subscriber is a subscriber registered in the selective call acceptance service, a predetermined call subscriber is sent to the calling station. Caller ID information requesting step for transmitting request information transmission request signal, Caller ID information searching step for determining whether caller ID information matches any selected call information when receiving caller ID information from sender station, and caller ID information If any of the selected call information is matched, characterized in that it comprises a call processing step of performing a normal call processing.

That is, according to the above, the subscriber to the selective call acceptance service can be protected from the call request of other subscribers except for the specific subscriber designated by the subscriber.

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

4 is a block diagram illustrating hardware selection of a method for receiving a selected call in a satellite communication system according to an embodiment of the present invention.

In the figure, reference numeral 100 denotes a processor for performing overall control of the base station 3, 101 denotes a service subscriber information storage unit for storing subscriber information registered in the selective call receiving service, and 102, a selection selected by the service subscriber. An optional call information storage unit 103 for storing information of call subscribers is a special code information storage unit for storing code data for a plurality of special services provided by the system.

In other words, in the above-described configuration, once the incoming call request is received from the originating station 3, the processor 100 registers the incoming subscriber with the selective call reception service based on the called party number of the service subscriber information storage unit 101. It is judged whether it is. Subsequently, when the called party is registered in the selective call receiving service, the calling party 3 requests the sending of the calling party's calling information. Subsequently, when the calling party information of the calling subscriber is received from the calling station 3, the calling party information is searched based on the selected call information of the selected call information storage unit 102 to find whether the selected call information matches the calling party information. do.

Thus, the processor 100 controls the normal call processing to the called party when there exists the selection call information that matches the calling number information of the selection call information storage 102, but when the matching selection call information does not exist The call station 3 is controlled to transmit a predetermined call failure message.

Next, a method of receiving a selective call in a satellite communication system according to an embodiment of the present invention will be described. First, a process of registering a selection call by a subscriber will be described with reference to the flowchart of FIG. 5.

The subscriber can register for the selective call acceptance service by using his / her telephone.

That is, when a subscriber receives a handset and receives a predetermined off-hook signal (step ST501), the processor 100 transmits a dial tone to the subscriber according to a normal call processing operation (step ST502). Subsequently, the processor 100 controls the normal call processing when a general called number is input, but when a predetermined special service code signal for registering to the selective call receiving service is input (step ST503), the selective call subscriber is entered. It waits for the number to be input (step ST504).

In step ST504, the processor 100 waits for a predetermined time to input a selected call subscriber number (step ST505 and ST506). If a series of subscriber numbers are input from a subscriber before a predetermined time elapses, the processor 100 selects the selected call subscriber number. The call information storage unit 102 stores the call information (102).

On the other hand, if the selective call subscriber number is not input from the subscriber until the predetermined time elapses, the processor 100 controls to transmit a predetermined error sound to the subscriber (step ST508).

Next, a method of receiving a selective call in a satellite communication system according to an embodiment of the present invention will be described with reference to FIG. 6.

First, when a call request signal is inputted from a subscriber having jurisdiction, the originating station 3 transmits a predetermined call request signal to the central control station 2 together with the called party information. Then, the central control station 2 transmits the call path. Only a predetermined digit for setting is detected and based on this, a predetermined incoming signal request signal is output to the destination station 3 together with the digit. In addition, the central control station 2 allocates the communication channel and the SCPC channel unit 24 to the calling station 3, and then the calling station 3 allocates the remaining subscriber information digits from the central control station 2. It is sent directly to the destination station (3) by using communication channel and SCPC channel unit.

That is, the destination station processor 100 is allocated from the central control station 2 with the incoming request signal including the called party information and the available communication channel and SCPC channel unit 24, and then transmitted from the originating station 3. Upon receiving the remaining subscriber information (step ST601), the processor 100 searches whether the subscriber subscriber information transmitted from the calling subscriber is identical to the data of the service subscriber information storage unit 101 (ST602, ST603). step).

Subsequently, if the incoming subscriber information received in step ST603 does not match the data stored in the service subscriber information storage unit 101, the processor 100 controls normal call processing (step ST604).

On the other hand, if the incoming subscriber information received in step ST603 matches the data stored in the service subscriber government storage unit 101, the processor 100 requests the transmission of the calling party subscriber information to the calling station 3; A call number information request signal is sent (step ST605).

Thereafter, the processor 100 waits for the caller ID information of the caller subscriber from the caller station 3 (step ST606). Subsequently, when the calling party information is received from the calling station 3, the processor 100 compares the received calling party information with the selected call information stored in the selective call information storing unit 102 (step ST607). ).

As a result of the comparison, if any selected call information in the selected call information storage unit 102 and the calling number information received from the originating station 3 match, normal call processing is controlled as in step ST604.

On the other hand, as a result of the comparison in step ST607, if it does not match, the processor 100 transmits a predetermined call failure notification to the calling station 3 (step ST608).

Therefore, according to the above configuration, the subscriber to the selective call reception service can be protected from the call requests of other subscribers except for the specific subscriber designated by the subscriber.

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, when an arbitrary incoming call is received by storing subscriber information to selectively receive an incoming call at a base station coupled with a subscriber and selection call information selected by the subscriber in a predetermined database. The selective call accommodating method can be realized in a satellite communication system that can selectively accept an incoming call based on the subscriber information and the selective call information of the database.

Claims (3)

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; The base station is a registration determination step of determining whether the subscriber is registered in the selective call acceptance service when the incoming request message is received; A caller information request step of transmitting a caller ID information transmission request signal of a predetermined caller subscriber to the caller when the subscriber is a subscriber registered in the selective call acceptance service; Caller ID information searching step for determining whether the caller ID information is matched with any selected call information when the calling party information is received from the calling station, Selective call reception method in a satellite communication system comprising a call processing step of performing a normal call processing if the call number information and the arbitrary selection call information is matched. The method of claim 1, And a call processing step of performing a normal call processing when the subscriber is not registered in the selective call accommodation service in the step of determining whether to register the selective call subscriber. The method of claim 1, And a call failure processing step of outputting a predetermined call failure message to the calling station when the calling number information received from the calling station does not match any selected call information in the calling party information searching step. How to accept a choice.